Splitted DebugVariableGraphicPanel.py into several files
authorLaurent Bessard
Fri, 31 May 2013 00:07:21 +0200
changeset 1200 501cb0bb4c05
parent 1199 fc0e7d80494f
child 1201 3907f10efcf4
Splitted DebugVariableGraphicPanel.py into several files
controls/DebugVariablePanel/DebugVariableGraphicPanel.py
controls/DebugVariablePanel/DebugVariableGraphicViewer.py
controls/DebugVariablePanel/DebugVariableTextViewer.py
controls/DebugVariablePanel/DebugVariableViewer.py
controls/DebugVariablePanel/GraphButton.py
--- a/controls/DebugVariablePanel/DebugVariableGraphicPanel.py	Thu May 30 13:23:21 2013 +0200
+++ b/controls/DebugVariablePanel/DebugVariableGraphicPanel.py	Fri May 31 00:07:21 2013 +0200
@@ -23,7 +23,6 @@
 #Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 from types import TupleType
-from time import time as gettime
 import math
 import numpy
 
@@ -33,88 +32,44 @@
 import matplotlib
 matplotlib.use('WX')
 import matplotlib.pyplot
-from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
 from matplotlib.backends.backend_wxagg import _convert_agg_to_wx_bitmap
-from matplotlib.backends.backend_agg import FigureCanvasAgg
-from mpl_toolkits.mplot3d import Axes3D
-color_cycle = ['r', 'b', 'g', 'm', 'y', 'k']
-cursor_color = '#800080'
-
-from editors.DebugViewer import DebugViewer, REFRESH_PERIOD
-from dialogs.ForceVariableDialog import ForceVariableDialog
+
+from editors.DebugViewer import DebugViewer
 from util.BitmapLibrary import GetBitmap
 
 from DebugVariableItem import DebugVariableItem
-from GraphButton import GraphButton
+from DebugVariableTextViewer import DebugVariableTextViewer
+from DebugVariableGraphicViewer import *
 
 class DebugVariableDropTarget(wx.TextDropTarget):
     
-    def __init__(self, parent, control=None):
+    def __init__(self, parent):
         wx.TextDropTarget.__init__(self)
         self.ParentWindow = parent
-        self.ParentControl = control
     
     def __del__(self):
         self.ParentWindow = None
-        self.ParentControl = None
     
     def OnDragOver(self, x, y, d):
-        if self.ParentControl is not None:
-            self.ParentControl.OnMouseDragging(x, y)
-        else:
-            self.ParentWindow.RefreshHighlight(x, y)
+        self.ParentControl.OnMouseDragging(x, y)
+        self.ParentWindow.RefreshHighlight(x, y)
         return wx.TextDropTarget.OnDragOver(self, x, y, d)
         
     def OnDropText(self, x, y, data):
         message = None
         try:
             values = eval(data)
+            if not isinstance(values, TupleType):
+                raise
         except:
             message = _("Invalid value \"%s\" for debug variable")%data
             values = None
-        if not isinstance(values, TupleType):
-            message = _("Invalid value \"%s\" for debug variable")%data
-            values = None
-        
+            
         if message is not None:
             wx.CallAfter(self.ShowMessage, message)
-        elif values is not None and values[1] == "debug":
-            if self.ParentControl is not None:
-                width, height = self.ParentControl.GetSize()
-                target_idx = self.ParentControl.GetIndex()
-                merge_type = GRAPH_PARALLEL
-                if isinstance(self.ParentControl, DebugVariableGraphic):
-                    if self.ParentControl.Is3DCanvas():
-                        if y > height / 2:
-                            target_idx += 1
-                        if len(values) > 1 and values[2] == "move":
-                            self.ParentWindow.MoveValue(values[0], target_idx)
-                        else:
-                            self.ParentWindow.InsertValue(values[0], target_idx, force=True)
-                        
-                    else:
-                        rect = self.ParentControl.GetAxesBoundingBox()
-                        if rect.InsideXY(x, y):
-                            merge_rect = wx.Rect(rect.x, rect.y, rect.width / 2., rect.height)
-                            if merge_rect.InsideXY(x, y):
-                                merge_type = GRAPH_ORTHOGONAL
-                            wx.CallAfter(self.ParentWindow.MergeGraphs, values[0], target_idx, merge_type, force=True)
-                        else:
-                            if y > height / 2:
-                                target_idx += 1
-                            if len(values) > 2 and values[2] == "move":
-                                self.ParentWindow.MoveValue(values[0], target_idx)
-                            else:
-                                self.ParentWindow.InsertValue(values[0], target_idx, force=True)
-                else:
-                    if y > height / 2:
-                        target_idx += 1
-                    if len(values) > 2 and values[2] == "move":
-                        self.ParentWindow.MoveValue(values[0], target_idx)
-                    else:
-                        self.ParentWindow.InsertValue(values[0], target_idx, force=True)
-                    
-            elif len(values) > 2 and values[2] == "move":
+        
+        elif values[1] == "debug":
+            if len(values) > 2 and values[2] == "move":
                 self.ParentWindow.MoveValue(values[0])
             else:
                 self.ParentWindow.InsertValue(values[0], force=True)
@@ -141,32 +96,8 @@
     [("%dm" % i, i * MINUTE) for i in (1, 2, 5, 10, 20, 30)] + \
     [("%dh" % i, i * HOUR) for i in (1, 2, 3, 6, 12, 24)]
 
-GRAPH_PARALLEL, GRAPH_ORTHOGONAL = range(2)
-
 SCROLLBAR_UNIT = 10
 
-#CANVAS_HIGHLIGHT_TYPES
-[HIGHLIGHT_NONE,
- HIGHLIGHT_BEFORE,
- HIGHLIGHT_AFTER,
- HIGHLIGHT_LEFT,
- HIGHLIGHT_RIGHT,
- HIGHLIGHT_RESIZE] = range(6)
-
-HIGHLIGHT_DROP_PEN = wx.Pen(wx.Colour(0, 128, 255))
-HIGHLIGHT_DROP_BRUSH = wx.Brush(wx.Colour(0, 128, 255, 128))
-HIGHLIGHT_RESIZE_PEN = wx.Pen(wx.Colour(200, 200, 200))
-HIGHLIGHT_RESIZE_BRUSH = wx.Brush(wx.Colour(200, 200, 200))
-
-#CANVAS_SIZE_TYPES
-[SIZE_MINI, SIZE_MIDDLE, SIZE_MAXI] = [0, 100, 200]
-
-DEFAULT_CANVAS_HEIGHT = 200.
-CANVAS_BORDER = (20., 10.)
-CANVAS_PADDING = 8.5
-VALUE_LABEL_HEIGHT = 17.
-AXES_LABEL_HEIGHT = 12.75
-
 def compute_mask(x, y):
     mask = []
     for xp, yp in zip(x, y):
@@ -186,932 +117,6 @@
                 next_tick = min(next_tick, data[0][0])
     return next_tick
 
-def OrthogonalData(item, start_tick, end_tick):
-    data = item.GetData(start_tick, end_tick)
-    min_value, max_value = item.GetValueRange()
-    if min_value is not None and max_value is not None:
-        center = (min_value + max_value) / 2.
-        range = max(1.0, max_value - min_value)
-    else:
-        center = 0.5
-        range = 1.0
-    return data, center - range * 0.55, center + range * 0.55
-
-class DebugVariableViewer:
-    
-    def __init__(self, window, items=[]):
-        self.ParentWindow = window
-        self.Items = items
-        
-        self.Highlight = HIGHLIGHT_NONE
-        self.Buttons = []
-    
-    def __del__(self):
-        self.ParentWindow = None
-    
-    def GetIndex(self):
-        return self.ParentWindow.GetViewerIndex(self)
-    
-    def GetItem(self, variable):
-        for item in self.Items:
-            if item.GetVariable() == variable:
-                return item
-        return None
-    
-    def GetItems(self):
-        return self.Items
-    
-    def GetVariables(self):
-        if len(self.Items) > 1:
-            variables = [item.GetVariable() for item in self.Items]
-            if self.GraphType == GRAPH_ORTHOGONAL:
-                return tuple(variables)
-            return variables
-        return self.Items[0].GetVariable()
-    
-    def AddItem(self, item):
-        self.Items.append(item)
-        
-    def RemoveItem(self, item):
-        if item in self.Items:
-            self.Items.remove(item)
-        
-    def Clear(self):
-        for item in self.Items:
-            self.ParentWindow.RemoveDataConsumer(item)
-        self.Items = []
-        
-    def IsEmpty(self):
-        return len(self.Items) == 0
-    
-    def UnregisterObsoleteData(self):
-        for item in self.Items[:]:
-            iec_path = item.GetVariable()
-            if self.ParentWindow.GetDataType(iec_path) is None:
-                self.ParentWindow.RemoveDataConsumer(item)
-                self.RemoveItem(item)
-            else:
-                self.ParentWindow.AddDataConsumer(iec_path.upper(), item)
-                item.RefreshVariableType()
-        
-    def ResetData(self):
-        for item in self.Items:
-            item.ResetData()
-    
-    def RefreshViewer(self):
-        pass
-    
-    def SetHighlight(self, highlight):
-        if self.Highlight != highlight:
-            self.Highlight = highlight
-            return True
-        return False
-    
-    def GetButtons(self):
-        return self.Buttons
-    
-    def HandleButtons(self, x, y):
-        for button in self.GetButtons():
-            if button.HitTest(x, y):
-                button.ProcessCallback()
-                return True
-        return False
-    
-    def IsOverButton(self, x, y):
-        for button in self.GetButtons():
-            if button.HitTest(x, y):
-                return True
-        return False
-    
-    def ShowButtons(self, show):
-        for button in self.Buttons:
-            if show:
-                button.Show()
-            else:
-                button.Hide()
-        self.RefreshButtonsState()
-        self.ParentWindow.ForceRefresh()
-    
-    def RefreshButtonsState(self, refresh_positions=False):
-        if self:
-            width, height = self.GetSize()
-            if refresh_positions:
-                offset = 0
-                buttons = self.Buttons[:]
-                buttons.reverse()
-                for button in buttons:
-                    if button.IsEnabled():
-                        w, h = button.GetSize()
-                        button.SetPosition(width - 5 - w - offset, 5)
-                        offset += w + 2
-                self.ParentWindow.ForceRefresh()
-    
-    def DrawCommonElements(self, dc, buttons=None):
-        width, height = self.GetSize()
-        
-        dc.SetPen(HIGHLIGHT_DROP_PEN)
-        dc.SetBrush(HIGHLIGHT_DROP_BRUSH)
-        if self.Highlight in [HIGHLIGHT_BEFORE]:
-            dc.DrawLine(0, 1, width - 1, 1)
-        elif self.Highlight in [HIGHLIGHT_AFTER]:
-            dc.DrawLine(0, height - 1, width - 1, height - 1)
-        
-        if buttons is None:
-            buttons = self.Buttons
-        for button in buttons:
-            button.Draw(dc)
-            
-        if self.ParentWindow.IsDragging():
-            destBBox = self.ParentWindow.GetDraggingAxesClippingRegion(self)
-            srcPos = self.ParentWindow.GetDraggingAxesPosition(self)
-            if destBBox.width > 0 and destBBox.height > 0:
-                srcPanel = self.ParentWindow.DraggingAxesPanel
-                srcBBox = srcPanel.GetAxesBoundingBox()
-                
-                if destBBox.x == 0:
-                    srcX = srcBBox.x - srcPos.x
-                else:
-                    srcX = srcBBox.x
-                if destBBox.y == 0:
-                    srcY = srcBBox.y - srcPos.y
-                else:
-                    srcY = srcBBox.y
-                
-                srcBmp = _convert_agg_to_wx_bitmap(srcPanel.get_renderer(), None)
-                srcDC = wx.MemoryDC()
-                srcDC.SelectObject(srcBmp)
-                
-                dc.Blit(destBBox.x, destBBox.y, 
-                        int(destBBox.width), int(destBBox.height), 
-                        srcDC, srcX, srcY)
-    
-    def OnEnter(self, event):
-        self.ShowButtons(True)
-        event.Skip()
-        
-    def OnLeave(self, event):
-        if self.Highlight != HIGHLIGHT_RESIZE or self.CanvasStartSize is None:
-            x, y = event.GetPosition()
-            width, height = self.GetSize()
-            if (x <= 0 or x >= width - 1 or
-                y <= 0 or y >= height - 1):
-                self.ShowButtons(False)
-        event.Skip()
-    
-    def OnCloseButton(self):
-        wx.CallAfter(self.ParentWindow.DeleteValue, self)
-    
-    def OnForceButton(self):
-        wx.CallAfter(self.ForceValue, self.Items[0])
-        
-    def OnReleaseButton(self):
-        wx.CallAfter(self.ReleaseValue, self.Items[0])
-    
-    def OnResizeWindow(self, event):
-        wx.CallAfter(self.RefreshButtonsState, True)
-        event.Skip()
-    
-    def OnMouseDragging(self, x, y):
-        xw, yw = self.GetPosition()
-        self.ParentWindow.RefreshHighlight(x + xw, y + yw)
-    
-    def OnDragging(self, x, y):
-        width, height = self.GetSize()
-        if y < height / 2:
-            if self.ParentWindow.IsViewerFirst(self):
-                self.SetHighlight(HIGHLIGHT_BEFORE)
-            else:
-                self.SetHighlight(HIGHLIGHT_NONE)
-                self.ParentWindow.HighlightPreviousViewer(self)
-        else:
-            self.SetHighlight(HIGHLIGHT_AFTER)
-    
-    def OnEraseBackground(self, event):
-        pass
-    
-    def OnResize(self, event):
-        wx.CallAfter(self.RefreshButtonsState, True)
-        event.Skip()
-    
-    def ForceValue(self, item):
-        iec_path = item.GetVariable()
-        iec_type = self.ParentWindow.GetDataType(iec_path)
-        if iec_type is not None:
-            dialog = ForceVariableDialog(self, iec_type, str(item.GetValue()))
-            if dialog.ShowModal() == wx.ID_OK:
-                self.ParentWindow.ForceDataValue(iec_path.upper(), dialog.GetValue())
-    
-    def ReleaseValue(self, item):
-        iec_path = item.GetVariable().upper()
-        self.ParentWindow.ReleaseDataValue(iec_path)
-
-
-class DebugVariableText(DebugVariableViewer, wx.Panel):
-    
-    def __init__(self, parent, window, items=[]):
-        DebugVariableViewer.__init__(self, window, items)
-        
-        wx.Panel.__init__(self, parent)
-        self.SetBackgroundColour(wx.WHITE)
-        self.SetDropTarget(DebugVariableDropTarget(window, self))
-        self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
-        self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
-        self.Bind(wx.EVT_ENTER_WINDOW, self.OnEnter)
-        self.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeave)
-        self.Bind(wx.EVT_SIZE, self.OnResize)
-        self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)
-        self.Bind(wx.EVT_PAINT, self.OnPaint)
-        
-        self.SetMinSize(wx.Size(0, 25))
-        
-        for bitmap, callback in [("force", self.OnForceButton),
-                                 ("release", self.OnReleaseButton),
-                                 ("delete_graph", self.OnCloseButton)]:
-            self.Buttons.append(GraphButton(0, 0, bitmap, callback))
-        
-        self.ShowButtons(False)
-        
-    def RefreshViewer(self):
-        width, height = self.GetSize()
-        bitmap = wx.EmptyBitmap(width, height)
-        
-        dc = wx.BufferedDC(wx.ClientDC(self), bitmap)
-        dc.Clear()
-        dc.BeginDrawing()
-        
-        gc = wx.GCDC(dc)
-        
-        item_name = self.Items[0].GetVariable(self.ParentWindow.GetVariableNameMask())
-        w, h = gc.GetTextExtent(item_name)
-        gc.DrawText(item_name, 20, (height - h) / 2)
-        
-        if self.Items[0].IsForced():
-            gc.SetTextForeground(wx.BLUE)
-            self.Buttons[0].Disable()
-            self.Buttons[1].Enable()
-        else:
-            self.Buttons[1].Disable()
-            self.Buttons[0].Enable()
-        self.RefreshButtonsState(True)
-        
-        item_value = self.Items[0].GetValue()
-        w, h = gc.GetTextExtent(item_value)
-        gc.DrawText(item_value, width - 40 - w, (height - h) / 2)
-        
-        self.DrawCommonElements(gc)
-        
-        gc.EndDrawing()
-    
-    def OnLeftDown(self, event):
-        width, height = self.GetSize()
-        item_name = self.Items[0].GetVariable(self.ParentWindow.GetVariableNameMask())
-        w, h = self.GetTextExtent(item_name)
-        x, y = event.GetPosition()
-        rect = wx.Rect(20, (height - h) / 2, w, h)
-        if rect.InsideXY(x, y):
-            data = wx.TextDataObject(str((self.Items[0].GetVariable(), "debug", "move")))
-            dragSource = wx.DropSource(self)
-            dragSource.SetData(data)
-            dragSource.DoDragDrop()
-        else:
-            event.Skip()
-    
-    def OnLeftUp(self, event):
-        x, y = event.GetPosition()
-        wx.CallAfter(self.HandleButtons, x, y)
-        event.Skip()
-    
-    def OnPaint(self, event):
-        self.RefreshViewer()
-        event.Skip()
-
-class DebugVariableGraphic(DebugVariableViewer, FigureCanvas):
-    
-    def __init__(self, parent, window, items, graph_type):
-        DebugVariableViewer.__init__(self, window, items)
-        
-        self.CanvasSize = SIZE_MINI
-        self.GraphType = graph_type
-        self.CursorTick = None
-        self.MouseStartPos = None
-        self.StartCursorTick = None
-        self.CanvasStartSize = None
-        self.ContextualButtons = []
-        self.ContextualButtonsItem = None
-        
-        self.Figure = matplotlib.figure.Figure(facecolor='w')
-        self.Figure.subplotpars.update(top=0.95, left=0.1, bottom=0.1, right=0.95)
-        
-        FigureCanvas.__init__(self, parent, -1, self.Figure)
-        self.SetWindowStyle(wx.WANTS_CHARS)
-        self.SetBackgroundColour(wx.WHITE)
-        self.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
-        self.Bind(wx.EVT_ENTER_WINDOW, self.OnEnter)
-        self.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeave)
-        self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)
-        self.Bind(wx.EVT_SIZE, self.OnResize)
-        
-        canvas_size = self.GetCanvasMinSize()
-        self.SetMinSize(canvas_size)
-        self.SetDropTarget(DebugVariableDropTarget(self.ParentWindow, self))
-        self.mpl_connect('button_press_event', self.OnCanvasButtonPressed)
-        self.mpl_connect('motion_notify_event', self.OnCanvasMotion)
-        self.mpl_connect('button_release_event', self.OnCanvasButtonReleased)
-        self.mpl_connect('scroll_event', self.OnCanvasScroll)
-        
-        for size, bitmap in zip([SIZE_MINI, SIZE_MIDDLE, SIZE_MAXI],
-                                ["minimize_graph", "middle_graph", "maximize_graph"]):
-            self.Buttons.append(GraphButton(0, 0, bitmap, self.GetOnChangeSizeButton(size)))
-        for bitmap, callback in [("export_graph_mini", self.OnExportGraphButton),
-                                 ("delete_graph", self.OnCloseButton)]:
-            self.Buttons.append(GraphButton(0, 0, bitmap, callback))
-        
-        self.ResetGraphics()
-        self.RefreshLabelsPosition(canvas_size.height)
-        self.ShowButtons(False)
-    
-    def draw(self, drawDC=None):
-        FigureCanvasAgg.draw(self)
-
-        self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
-        self.bitmap.UseAlpha() 
-        width, height = self.GetSize()
-        bbox = self.GetAxesBoundingBox()
-        
-        destDC = wx.MemoryDC()
-        destDC.SelectObject(self.bitmap)
-        
-        destGC = wx.GCDC(destDC)
-        
-        destGC.BeginDrawing()
-        if self.Highlight == HIGHLIGHT_RESIZE:
-            destGC.SetPen(HIGHLIGHT_RESIZE_PEN)
-            destGC.SetBrush(HIGHLIGHT_RESIZE_BRUSH)
-            destGC.DrawRectangle(0, height - 5, width, 5)
-        else:
-            destGC.SetPen(HIGHLIGHT_DROP_PEN)
-            destGC.SetBrush(HIGHLIGHT_DROP_BRUSH)
-            if self.Highlight == HIGHLIGHT_LEFT:
-                destGC.DrawRectangle(bbox.x, bbox.y, 
-                                     bbox.width / 2, bbox.height)
-            elif self.Highlight == HIGHLIGHT_RIGHT:
-                destGC.DrawRectangle(bbox.x + bbox.width / 2, bbox.y, 
-                                     bbox.width / 2, bbox.height)
-        
-        self.DrawCommonElements(destGC, self.Buttons + self.ContextualButtons)
-        
-        destGC.EndDrawing()
-        
-        self._isDrawn = True
-        self.gui_repaint(drawDC=drawDC)
-    
-    def GetButtons(self):
-        return self.Buttons + self.ContextualButtons
-    
-    def PopupContextualButtons(self, item, rect, style=wx.RIGHT):
-        if self.ContextualButtonsItem is not None and item != self.ContextualButtonsItem:
-            self.DismissContextualButtons()
-        
-        if self.ContextualButtonsItem is None:
-            self.ContextualButtonsItem = item
-            
-            if self.ContextualButtonsItem.IsForced():
-                self.ContextualButtons.append(
-                    GraphButton(0, 0, "release", self.OnReleaseButton))
-            for bitmap, callback in [("force", self.OnForceButton),
-                                     ("export_graph_mini", self.OnExportItemGraphButton),
-                                     ("delete_graph", self.OnRemoveItemButton)]:
-                self.ContextualButtons.append(GraphButton(0, 0, bitmap, callback))
-            
-            offset = 0
-            buttons = self.ContextualButtons[:]
-            if style in [wx.TOP, wx.LEFT]:
-                 buttons.reverse()
-            for button in buttons:
-                w, h = button.GetSize()
-                if style in [wx.LEFT, wx.RIGHT]:
-                    if style == wx.LEFT:
-                        x = rect.x - w - offset
-                    else:
-                        x = rect.x + rect.width + offset
-                    y = rect.y + (rect.height - h) / 2
-                    offset += w
-                else:
-                    x = rect.x + (rect.width - w ) / 2
-                    if style == wx.TOP:
-                        y = rect.y - h - offset
-                    else:
-                        y = rect.y + rect.height + offset
-                    offset += h
-                button.SetPosition(x, y)
-            self.ParentWindow.ForceRefresh()
-    
-    def DismissContextualButtons(self):
-        if self.ContextualButtonsItem is not None:
-            self.ContextualButtonsItem = None
-            self.ContextualButtons = []
-            self.ParentWindow.ForceRefresh()
-    
-    def IsOverContextualButton(self, x, y):
-        for button in self.ContextualButtons:
-            if button.HitTest(x, y):
-                return True
-        return False
-    
-    def SetMinSize(self, size):
-        wx.Window.SetMinSize(self, size)
-        wx.CallAfter(self.RefreshButtonsState)
-    
-    def GetOnChangeSizeButton(self, size):
-        def OnChangeSizeButton():
-            self.CanvasSize = size
-            self.SetCanvasSize(200, self.CanvasSize)
-        return OnChangeSizeButton
-    
-    def OnExportGraphButton(self):
-        self.ExportGraph()
-    
-    def OnForceButton(self):
-        wx.CallAfter(self.ForceValue, 
-                     self.ContextualButtonsItem)
-        self.DismissContextualButtons()
-        
-    def OnReleaseButton(self):
-        wx.CallAfter(self.ReleaseValue, 
-                     self.ContextualButtonsItem)
-        self.DismissContextualButtons()
-    
-    def OnExportItemGraphButton(self):
-        wx.CallAfter(self.ExportGraph, 
-                     self.ContextualButtonsItem)
-        self.DismissContextualButtons()
-        
-    def OnRemoveItemButton(self):            
-        wx.CallAfter(self.ParentWindow.DeleteValue, self, 
-                     self.ContextualButtonsItem)
-        self.DismissContextualButtons()
-    
-    def RefreshLabelsPosition(self, height):
-        canvas_ratio = 1. / height
-        graph_ratio = 1. / ((1.0 - (CANVAS_BORDER[0] + CANVAS_BORDER[1]) * canvas_ratio) * height)
-        
-        self.Figure.subplotpars.update(
-            top= 1.0 - CANVAS_BORDER[1] * canvas_ratio, 
-            bottom= CANVAS_BORDER[0] * canvas_ratio)
-        
-        if self.GraphType == GRAPH_PARALLEL or self.Is3DCanvas():
-            num_item = len(self.Items)
-            for idx in xrange(num_item):
-                if not self.Is3DCanvas():
-                    self.AxesLabels[idx].set_position(
-                        (0.05, 
-                         1.0 - (CANVAS_PADDING + AXES_LABEL_HEIGHT * idx) * graph_ratio))
-                self.Labels[idx].set_position(
-                    (0.95, 
-                     CANVAS_PADDING * graph_ratio + 
-                     (num_item - idx - 1) * VALUE_LABEL_HEIGHT * graph_ratio))
-        else:
-            self.AxesLabels[0].set_position((0.1, CANVAS_PADDING * graph_ratio))
-            self.Labels[0].set_position((0.95, CANVAS_PADDING * graph_ratio))
-            self.AxesLabels[1].set_position((0.05, 2 * CANVAS_PADDING * graph_ratio))
-            self.Labels[1].set_position((0.05, 1.0 - CANVAS_PADDING * graph_ratio))
-    
-        self.Figure.subplots_adjust()
-    
-    def GetCanvasMinSize(self):
-        return wx.Size(200, 
-                       CANVAS_BORDER[0] + CANVAS_BORDER[1] + 
-                       2 * CANVAS_PADDING + VALUE_LABEL_HEIGHT * len(self.Items))
-    
-    def SetCanvasSize(self, width, height):
-        height = max(height, self.GetCanvasMinSize()[1])
-        self.SetMinSize(wx.Size(width, height))
-        self.RefreshLabelsPosition(height)
-        self.RefreshButtonsState()
-        self.ParentWindow.RefreshGraphicsSizer()
-        
-    def GetAxesBoundingBox(self, absolute=False):
-        width, height = self.GetSize()
-        ax, ay, aw, ah = self.figure.gca().get_position().bounds
-        bbox = wx.Rect(ax * width, height - (ay + ah) * height - 1,
-                       aw * width + 2, ah * height + 1)
-        if absolute:
-            xw, yw = self.GetPosition()
-            bbox.x += xw
-            bbox.y += yw
-        return bbox
-    
-    def OnCanvasButtonPressed(self, event):
-        width, height = self.GetSize()
-        x, y = event.x, height - event.y
-        if not self.IsOverButton(x, y):
-            if event.inaxes == self.Axes:
-                item_idx = None
-                for i, t in ([pair for pair in enumerate(self.AxesLabels)] + 
-                             [pair for pair in enumerate(self.Labels)]):
-                    (x0, y0), (x1, y1) = t.get_window_extent().get_points()
-                    rect = wx.Rect(x0, height - y1, x1 - x0, y1 - y0)
-                    if rect.InsideXY(x, y):
-                        item_idx = i
-                        break
-                if item_idx is not None:
-                    self.ShowButtons(False)
-                    self.DismissContextualButtons()
-                    xw, yw = self.GetPosition()
-                    self.ParentWindow.StartDragNDrop(self, 
-                        self.Items[item_idx], x + xw, y + yw, x + xw, y + yw)
-                elif not self.Is3DCanvas():
-                    self.MouseStartPos = wx.Point(x, y)
-                    if event.button == 1 and event.inaxes == self.Axes:
-                        self.StartCursorTick = self.CursorTick
-                        self.HandleCursorMove(event)
-                    elif event.button == 2 and self.GraphType == GRAPH_PARALLEL:
-                        width, height = self.GetSize()
-                        start_tick, end_tick = self.ParentWindow.GetRange()
-                        self.StartCursorTick = start_tick
-            
-            elif event.button == 1 and event.y <= 5:
-                self.MouseStartPos = wx.Point(x, y)
-                self.CanvasStartSize = self.GetSize()
-    
-    def OnCanvasButtonReleased(self, event):
-        if self.ParentWindow.IsDragging():
-            width, height = self.GetSize()
-            xw, yw = self.GetPosition()
-            self.ParentWindow.StopDragNDrop(
-                self.ParentWindow.DraggingAxesPanel.Items[0].GetVariable(),
-                xw + event.x, 
-                yw + height - event.y)
-        else:
-            self.MouseStartPos = None
-            self.StartCursorTick = None
-            self.CanvasStartSize = None
-            width, height = self.GetSize()
-            self.HandleButtons(event.x, height - event.y)
-            if event.y > 5 and self.SetHighlight(HIGHLIGHT_NONE):
-                self.SetCursor(wx.NullCursor)
-                self.ParentWindow.ForceRefresh()
-    
-    def OnCanvasMotion(self, event):
-        width, height = self.GetSize()
-        if self.ParentWindow.IsDragging():
-            xw, yw = self.GetPosition()
-            self.ParentWindow.MoveDragNDrop(
-                xw + event.x, 
-                yw + height - event.y)
-        else:
-            if not self.Is3DCanvas():
-                if event.button == 1 and self.CanvasStartSize is None:
-                    if event.inaxes == self.Axes:
-                        if self.MouseStartPos is not None:
-                            self.HandleCursorMove(event)
-                    elif self.MouseStartPos is not None and len(self.Items) == 1:
-                        xw, yw = self.GetPosition()
-                        self.ParentWindow.SetCursorTick(self.StartCursorTick)
-                        self.ParentWindow.StartDragNDrop(self, 
-                            self.Items[0],
-                            event.x + xw, height - event.y + yw, 
-                            self.MouseStartPos.x + xw, self.MouseStartPos.y + yw)
-                elif event.button == 2 and self.GraphType == GRAPH_PARALLEL and self.MouseStartPos is not None:
-                    start_tick, end_tick = self.ParentWindow.GetRange()
-                    rect = self.GetAxesBoundingBox()
-                    self.ParentWindow.SetCanvasPosition(
-                        self.StartCursorTick + (self.MouseStartPos.x - event.x) *
-                        (end_tick - start_tick) / rect.width)    
-            
-            if event.button == 1 and self.CanvasStartSize is not None:
-                width, height = self.GetSize()
-                self.SetCanvasSize(width, 
-                    self.CanvasStartSize.height + height - event.y - self.MouseStartPos.y)
-                
-            elif event.button in [None, "up", "down"]:
-                if self.GraphType == GRAPH_PARALLEL:
-                    orientation = [wx.RIGHT] * len(self.AxesLabels) + [wx.LEFT] * len(self.Labels)
-                elif len(self.AxesLabels) > 0:
-                    orientation = [wx.RIGHT, wx.TOP, wx.LEFT, wx.BOTTOM]
-                else:
-                    orientation = [wx.LEFT] * len(self.Labels)
-                item_idx = None
-                item_style = None
-                for (i, t), style in zip([pair for pair in enumerate(self.AxesLabels)] + 
-                                         [pair for pair in enumerate(self.Labels)], 
-                                         orientation):
-                    (x0, y0), (x1, y1) = t.get_window_extent().get_points()
-                    rect = wx.Rect(x0, height - y1, x1 - x0, y1 - y0)
-                    if rect.InsideXY(event.x, height - event.y):
-                        item_idx = i
-                        item_style = style
-                        break
-                if item_idx is not None:
-                    self.PopupContextualButtons(self.Items[item_idx], rect, item_style)
-                    return 
-                if not self.IsOverContextualButton(event.x, height - event.y):
-                    self.DismissContextualButtons()
-                
-                if event.y <= 5:
-                    if self.SetHighlight(HIGHLIGHT_RESIZE):
-                        self.SetCursor(wx.StockCursor(wx.CURSOR_SIZENS))
-                        self.ParentWindow.ForceRefresh()
-                else:
-                    if self.SetHighlight(HIGHLIGHT_NONE):
-                        self.SetCursor(wx.NullCursor)
-                        self.ParentWindow.ForceRefresh()
-    
-    def OnCanvasScroll(self, event):
-        if event.inaxes is not None and event.guiEvent.ControlDown():
-            if self.GraphType == GRAPH_ORTHOGONAL:
-                start_tick, end_tick = self.ParentWindow.GetRange()
-                tick = (start_tick + end_tick) / 2.
-            else:
-                tick = event.xdata
-            self.ParentWindow.ChangeRange(int(-event.step) / 3, tick)
-            self.ParentWindow.VetoScrollEvent = True
-    
-    def OnDragging(self, x, y):
-        width, height = self.GetSize()
-        bbox = self.GetAxesBoundingBox()
-        if bbox.InsideXY(x, y) and not self.Is3DCanvas():
-            rect = wx.Rect(bbox.x, bbox.y, bbox.width / 2, bbox.height)
-            if rect.InsideXY(x, y):
-                self.SetHighlight(HIGHLIGHT_LEFT)
-            else:
-                self.SetHighlight(HIGHLIGHT_RIGHT)
-        elif y < height / 2:
-            if self.ParentWindow.IsViewerFirst(self):
-                self.SetHighlight(HIGHLIGHT_BEFORE)
-            else:
-                self.SetHighlight(HIGHLIGHT_NONE)
-                self.ParentWindow.HighlightPreviousViewer(self)
-        else:
-            self.SetHighlight(HIGHLIGHT_AFTER)
-    
-    def OnLeave(self, event):
-        if self.CanvasStartSize is None and self.SetHighlight(HIGHLIGHT_NONE):
-            self.SetCursor(wx.NullCursor)
-            self.ParentWindow.ForceRefresh()
-        DebugVariableViewer.OnLeave(self, event)
-    
-    KEY_CURSOR_INCREMENT = {
-        wx.WXK_LEFT: -1,
-        wx.WXK_RIGHT: 1,
-        wx.WXK_UP: -10,
-        wx.WXK_DOWN: 10}
-    def OnKeyDown(self, event):
-        if self.CursorTick is not None:
-            move = self.KEY_CURSOR_INCREMENT.get(event.GetKeyCode(), None)
-            if move is not None:
-                self.ParentWindow.MoveCursorTick(move)
-        event.Skip()
-    
-    def HandleCursorMove(self, event):
-        start_tick, end_tick = self.ParentWindow.GetRange()
-        cursor_tick = None
-        if self.GraphType == GRAPH_ORTHOGONAL:
-            x_data = self.Items[0].GetData(start_tick, end_tick)
-            y_data = self.Items[1].GetData(start_tick, end_tick)
-            if len(x_data) > 0 and len(y_data) > 0:
-                length = min(len(x_data), len(y_data))
-                d = numpy.sqrt((x_data[:length,1]-event.xdata) ** 2 + (y_data[:length,1]-event.ydata) ** 2)
-                cursor_tick = x_data[numpy.argmin(d), 0]
-        else:
-            data = self.Items[0].GetData(start_tick, end_tick)
-            if len(data) > 0:
-                cursor_tick = data[numpy.argmin(numpy.abs(data[:,0] - event.xdata)), 0]
-        if cursor_tick is not None:
-            self.ParentWindow.SetCursorTick(cursor_tick)
-    
-    def OnAxesMotion(self, event):
-        if self.Is3DCanvas():
-            current_time = gettime()
-            if current_time - self.LastMotionTime > REFRESH_PERIOD:
-                self.LastMotionTime = current_time
-                Axes3D._on_move(self.Axes, event)
-    
-    def ResetGraphics(self):
-        self.Figure.clear()
-        if self.Is3DCanvas():
-            self.Axes = self.Figure.gca(projection='3d')
-            self.Axes.set_color_cycle(['b'])
-            self.LastMotionTime = gettime()
-            setattr(self.Axes, "_on_move", self.OnAxesMotion)
-            self.Axes.mouse_init()
-            self.Axes.tick_params(axis='z', labelsize='small')
-        else:
-            self.Axes = self.Figure.gca()
-            self.Axes.set_color_cycle(color_cycle)
-        self.Axes.tick_params(axis='x', labelsize='small')
-        self.Axes.tick_params(axis='y', labelsize='small')
-        self.Plots = []
-        self.VLine = None
-        self.HLine = None
-        self.Labels = []
-        self.AxesLabels = []
-        if not self.Is3DCanvas():
-            text_func = self.Axes.text
-        else:
-            text_func = self.Axes.text2D
-        if self.GraphType == GRAPH_PARALLEL or self.Is3DCanvas():
-            num_item = len(self.Items)
-            for idx in xrange(num_item):
-                if num_item == 1:
-                    color = 'k'
-                else:
-                    color = color_cycle[idx % len(color_cycle)]
-                if not self.Is3DCanvas():
-                    self.AxesLabels.append(
-                        text_func(0, 0, "", size='small',
-                                  verticalalignment='top', 
-                                  color=color,
-                                  transform=self.Axes.transAxes))
-                self.Labels.append(
-                    text_func(0, 0, "", size='large', 
-                              horizontalalignment='right',
-                              color=color,
-                              transform=self.Axes.transAxes))
-        else:
-            self.AxesLabels.append(
-                self.Axes.text(0, 0, "", size='small',
-                               transform=self.Axes.transAxes))
-            self.Labels.append(
-                self.Axes.text(0, 0, "", size='large',
-                               horizontalalignment='right',
-                               transform=self.Axes.transAxes))
-            self.AxesLabels.append(
-                self.Axes.text(0, 0, "", size='small',
-                               rotation='vertical',
-                               verticalalignment='bottom',
-                               transform=self.Axes.transAxes))
-            self.Labels.append(
-                self.Axes.text(0, 0, "", size='large',
-                               rotation='vertical',
-                               verticalalignment='top',
-                               transform=self.Axes.transAxes))
-        width, height = self.GetSize()
-        self.RefreshLabelsPosition(height)
-        
-    def AddItem(self, item):
-        DebugVariableViewer.AddItem(self, item)
-        self.ResetGraphics()
-        
-    def RemoveItem(self, item):
-        DebugVariableViewer.RemoveItem(self, item)
-        if not self.IsEmpty():
-            if len(self.Items) == 1:
-                self.GraphType = GRAPH_PARALLEL
-            self.ResetGraphics()
-    
-    def UnregisterObsoleteData(self):
-        DebugVariableViewer.UnregisterObsoleteData(self)
-        if not self.IsEmpty():
-            self.ResetGraphics()
-    
-    def Is3DCanvas(self):
-        return self.GraphType == GRAPH_ORTHOGONAL and len(self.Items) == 3
-    
-    def SetCursorTick(self, cursor_tick):
-        self.CursorTick = cursor_tick
-        
-    def RefreshViewer(self, refresh_graphics=True):
-        
-        if refresh_graphics:
-            start_tick, end_tick = self.ParentWindow.GetRange()
-            
-            if self.GraphType == GRAPH_PARALLEL:    
-                min_value = max_value = None
-                
-                for idx, item in enumerate(self.Items):
-                    data = item.GetData(start_tick, end_tick)
-                    if data is not None:
-                        item_min_value, item_max_value = item.GetValueRange()
-                        if min_value is None:
-                            min_value = item_min_value
-                        elif item_min_value is not None:
-                            min_value = min(min_value, item_min_value)
-                        if max_value is None:
-                            max_value = item_max_value
-                        elif item_max_value is not None:
-                            max_value = max(max_value, item_max_value)
-                        
-                        if len(self.Plots) <= idx:
-                            self.Plots.append(
-                                self.Axes.plot(data[:, 0], data[:, 1])[0])
-                        else:
-                            self.Plots[idx].set_data(data[:, 0], data[:, 1])
-                    
-                if min_value is not None and max_value is not None:
-                    y_center = (min_value + max_value) / 2.
-                    y_range = max(1.0, max_value - min_value)
-                else:
-                    y_center = 0.5
-                    y_range = 1.0
-                x_min, x_max = start_tick, end_tick
-                y_min, y_max = y_center - y_range * 0.55, y_center + y_range * 0.55
-                
-                if self.CursorTick is not None and start_tick <= self.CursorTick <= end_tick:
-                    if self.VLine is None:
-                        self.VLine = self.Axes.axvline(self.CursorTick, color=cursor_color)
-                    else:
-                        self.VLine.set_xdata((self.CursorTick, self.CursorTick))
-                    self.VLine.set_visible(True)
-                else:
-                    if self.VLine is not None:
-                        self.VLine.set_visible(False)
-            else:
-                min_start_tick = reduce(max, [item.GetData()[0, 0] 
-                                              for item in self.Items
-                                              if len(item.GetData()) > 0], 0)
-                start_tick = max(start_tick, min_start_tick)
-                end_tick = max(end_tick, min_start_tick)
-                x_data, x_min, x_max = OrthogonalData(self.Items[0], start_tick, end_tick)
-                y_data, y_min, y_max = OrthogonalData(self.Items[1], start_tick, end_tick)
-                if self.CursorTick is not None:
-                    x_cursor, x_forced = self.Items[0].GetValue(self.CursorTick, raw=True)
-                    y_cursor, y_forced = self.Items[1].GetValue(self.CursorTick, raw=True)
-                length = 0
-                if x_data is not None and y_data is not None:  
-                    length = min(len(x_data), len(y_data))
-                if len(self.Items) < 3:
-                    if x_data is not None and y_data is not None:
-                        if len(self.Plots) == 0:
-                            self.Plots.append(
-                                self.Axes.plot(x_data[:, 1][:length], 
-                                               y_data[:, 1][:length])[0])
-                        else:
-                            self.Plots[0].set_data(
-                                x_data[:, 1][:length], 
-                                y_data[:, 1][:length])
-                    
-                    if self.CursorTick is not None and start_tick <= self.CursorTick <= end_tick:
-                        if self.VLine is None:
-                            self.VLine = self.Axes.axvline(x_cursor, color=cursor_color)
-                        else:
-                            self.VLine.set_xdata((x_cursor, x_cursor))
-                        if self.HLine is None:
-                            self.HLine = self.Axes.axhline(y_cursor, color=cursor_color)
-                        else:
-                            self.HLine.set_ydata((y_cursor, y_cursor))
-                        self.VLine.set_visible(True)
-                        self.HLine.set_visible(True)
-                    else:
-                        if self.VLine is not None:
-                            self.VLine.set_visible(False)
-                        if self.HLine is not None:
-                            self.HLine.set_visible(False)
-                else:
-                    while len(self.Axes.lines) > 0:
-                        self.Axes.lines.pop()
-                    z_data, z_min, z_max = OrthogonalData(self.Items[2], start_tick, end_tick)
-                    if self.CursorTick is not None:
-                        z_cursor, z_forced = self.Items[2].GetValue(self.CursorTick, raw=True)
-                    if x_data is not None and y_data is not None and z_data is not None:
-                        length = min(length, len(z_data))
-                        self.Axes.plot(x_data[:, 1][:length],
-                                       y_data[:, 1][:length],
-                                       zs = z_data[:, 1][:length])
-                    self.Axes.set_zlim(z_min, z_max)
-                    if self.CursorTick is not None and start_tick <= self.CursorTick <= end_tick:
-                        for kwargs in [{"xs": numpy.array([x_min, x_max])},
-                                       {"ys": numpy.array([y_min, y_max])},
-                                       {"zs": numpy.array([z_min, z_max])}]:
-                            for param, value in [("xs", numpy.array([x_cursor, x_cursor])),
-                                                 ("ys", numpy.array([y_cursor, y_cursor])),
-                                                 ("zs", numpy.array([z_cursor, z_cursor]))]:
-                                kwargs.setdefault(param, value)
-                            kwargs["color"] = cursor_color
-                            self.Axes.plot(**kwargs)
-                
-            self.Axes.set_xlim(x_min, x_max)
-            self.Axes.set_ylim(y_min, y_max)
-        
-        variable_name_mask = self.ParentWindow.GetVariableNameMask()
-        if self.CursorTick is not None:
-            values, forced = apply(zip, [item.GetValue(self.CursorTick) for item in self.Items])
-        else:
-            values, forced = apply(zip, [(item.GetValue(), item.IsForced()) for item in self.Items])
-        labels = [item.GetVariable(variable_name_mask) for item in self.Items]
-        styles = map(lambda x: {True: 'italic', False: 'normal'}[x], forced)
-        if self.Is3DCanvas():
-            for idx, label_func in enumerate([self.Axes.set_xlabel, 
-                                              self.Axes.set_ylabel,
-                                              self.Axes.set_zlabel]):
-                label_func(labels[idx], fontdict={'size': 'small','color': color_cycle[idx]})
-        else:
-            for label, text in zip(self.AxesLabels, labels):
-                label.set_text(text)
-        for label, value, style in zip(self.Labels, values, styles):
-            label.set_text(value)
-            label.set_style(style)
-        
-        self.draw()
-
-    def ExportGraph(self, item=None):
-        if item is not None:
-            variables = [(item, [entry for entry in item.GetData()])]
-        else:
-            variables = [(item, [entry for entry in item.GetData()])
-                         for item in self.Items]
-        self.ParentWindow.CopyDataToClipboard(variables)
-    
 class DebugVariableGraphicPanel(wx.Panel, DebugViewer):
     
     def __init__(self, parent, producer, window):
@@ -1290,13 +295,13 @@
     
     def UpdateCursorTick(self):
         for panel in self.GraphicPanels:
-            if isinstance(panel, DebugVariableGraphic):
+            if isinstance(panel, DebugVariableGraphicViewer):
                 panel.SetCursorTick(self.CursorTick)
         self.ForceRefresh()
     
     def StartDragNDrop(self, panel, item, x_mouse, y_mouse, x_mouse_start, y_mouse_start):
         if len(panel.GetItems()) > 1:
-            self.DraggingAxesPanel = DebugVariableGraphic(self.GraphicsWindow, self, [item], GRAPH_PARALLEL)
+            self.DraggingAxesPanel = DebugVariableGraphicViewer(self.GraphicsWindow, self, [item], GRAPH_PARALLEL)
             self.DraggingAxesPanel.SetCursorTick(self.CursorTick)
             width, height = panel.GetSize()
             self.DraggingAxesPanel.SetSize(wx.Size(width, height))
@@ -1323,7 +328,7 @@
             if (rect.InsideXY(x_mouse, y_mouse) or 
                 idx == 0 and y_mouse < 0 or
                 idx == len(self.GraphicPanels) - 1 and y_mouse > panel.GetPosition()[1]):
-                panel.OnDragging(x_mouse - x, y_mouse - y)
+                panel.RefreshHighlight(x_mouse - x, y_mouse - y)
             else:
                 panel.SetHighlight(HIGHLIGHT_NONE)
         if wx.Platform == "__WXMSW__":
@@ -1370,7 +375,7 @@
             if bbox.InsideXY(x_mouse, y_mouse):
                 panel.ShowButtons(True)
                 merge_type = GRAPH_PARALLEL
-                if isinstance(panel, DebugVariableText) or panel.Is3DCanvas():
+                if isinstance(panel, DebugVariableTextViewer) or panel.Is3DCanvas():
                     if y_mouse > yw + height / 2:
                         idx += 1
                     wx.CallAfter(self.MoveValue, variable, idx)
@@ -1423,7 +428,7 @@
         if self.DraggingAxesPanel is not None and self.DraggingAxesPanel not in self.GraphicPanels:
             self.DraggingAxesPanel.RefreshViewer(refresh_graphics)
         for panel in self.GraphicPanels:
-            if isinstance(panel, DebugVariableGraphic):
+            if isinstance(panel, DebugVariableGraphicViewer):
                 panel.RefreshViewer(refresh_graphics)
             else:
                 panel.RefreshViewer()
@@ -1463,8 +468,8 @@
                 self.SetTickTime(self.DataProducer.GetTicktime())
         
         for panel in self.GraphicPanels:
-            panel.UnregisterObsoleteData()
-            if panel.IsEmpty():
+            panel.UnsubscribeObsoleteData()
+            if panel.ItemsIsEmpty():
                 if panel.HasCapture():
                     panel.ReleaseMouse()
                 self.GraphicPanels.remove(panel)
@@ -1625,11 +630,11 @@
         if result is not None or force:
             
             if item.IsNumVariable():
-                panel = DebugVariableGraphic(self.GraphicsWindow, self, [item], GRAPH_PARALLEL)
+                panel = DebugVariableGraphicViewer(self.GraphicsWindow, self, [item], GRAPH_PARALLEL)
                 if self.CursorTick is not None:
                     panel.SetCursorTick(self.CursorTick)
             else:
-                panel = DebugVariableText(self.GraphicsWindow, self, [item])
+                panel = DebugVariableTextViewer(self.GraphicsWindow, self, [item])
             if idx is not None:
                 self.GraphicPanels.insert(idx, panel)
             else:
@@ -1651,19 +656,19 @@
         if source_panel is not None:
             source_panel.RemoveItem(item)
             source_size = source_panel.GetSize()
-            if source_panel.IsEmpty():
+            if source_panel.ItemsIsEmpty():
                 if source_panel.HasCapture():
                     source_panel.ReleaseMouse()
                 self.GraphicPanels.remove(source_panel)
                 source_panel.Destroy()
             
             if item.IsNumVariable():
-                panel = DebugVariableGraphic(self.GraphicsWindow, self, [item], GRAPH_PARALLEL)
+                panel = DebugVariableGraphicViewer(self.GraphicsWindow, self, [item], GRAPH_PARALLEL)
                 panel.SetCanvasSize(source_size.width, source_size.height)
                 if self.CursorTick is not None:
                     panel.SetCursorTick(self.CursorTick)
             else:
-                panel = DebugVariableText(self.GraphicsWindow, self, [item])
+                panel = DebugVariableTextViewer(self.GraphicsWindow, self, [item])
             self.GraphicPanels.insert(idx, panel)
             self.ResetVariableNameMask()
             self.RefreshGraphicsSizer()
@@ -1699,7 +704,7 @@
                 
                 if source_panel is not None:
                     source_panel.RemoveItem(source_item)
-                    if source_panel.IsEmpty():
+                    if source_panel.ItemsIsEmpty():
                         if source_panel.HasCapture():
                             source_panel.ReleaseMouse()
                         self.GraphicPanels.remove(source_panel)
@@ -1730,14 +735,14 @@
         if source_idx is not None:
             
             if item is None:
-                source_panel.Clear()
+                source_panel.ClearItems()
                 source_panel.Destroy()
                 self.GraphicPanels.remove(source_panel)
                 self.ResetVariableNameMask()
                 self.RefreshGraphicsSizer()
             else:
                 source_panel.RemoveItem(item)
-                if source_panel.IsEmpty():
+                if source_panel.ItemsIsEmpty():
                     source_panel.Destroy()
                     self.GraphicPanels.remove(source_panel)
                     self.ResetVariableNameMask()
@@ -1749,7 +754,7 @@
         self.StartTick = 0
         self.Fixed = False
         for panel in self.GraphicPanels:
-            panel.ResetData()
+            panel.ResetItemsData()
         self.ResetCursorTick()
 
     def RefreshGraphicsWindowScrollbars(self):
@@ -1773,7 +778,7 @@
         size = self.GetSize()
         for panel in self.GraphicPanels:
             panel_size = panel.GetSize()
-            if (isinstance(panel, DebugVariableGraphic) and 
+            if (isinstance(panel, DebugVariableGraphicViewer) and 
                 panel.GraphType == GRAPH_ORTHOGONAL and 
                 panel_size.width == panel_size.height):
                 panel.SetCanvasSize(size.width, size.width)
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/controls/DebugVariablePanel/DebugVariableGraphicViewer.py	Fri May 31 00:07:21 2013 +0200
@@ -0,0 +1,763 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor
+#based on the plcopen standard. 
+#
+#Copyright (C) 2012: Edouard TISSERANT and Laurent BESSARD
+#
+#See COPYING file for copyrights details.
+#
+#This library is free software; you can redistribute it and/or
+#modify it under the terms of the GNU General Public
+#License as published by the Free Software Foundation; either
+#version 2.1 of the License, or (at your option) any later version.
+#
+#This library is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#General Public License for more details.
+#
+#You should have received a copy of the GNU General Public
+#License along with this library; if not, write to the Free Software
+#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+from types import TupleType
+from time import time as gettime
+import numpy
+
+import wx
+
+import matplotlib
+matplotlib.use('WX')
+import matplotlib.pyplot
+from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
+from matplotlib.backends.backend_wxagg import _convert_agg_to_wx_bitmap
+from matplotlib.backends.backend_agg import FigureCanvasAgg
+from mpl_toolkits.mplot3d import Axes3D
+
+from editors.DebugViewer import REFRESH_PERIOD
+
+from DebugVariableItem import DebugVariableItem
+from DebugVariableViewer import *
+from GraphButton import GraphButton
+
+GRAPH_PARALLEL, GRAPH_ORTHOGONAL = range(2)
+
+#CANVAS_SIZE_TYPES
+[SIZE_MINI, SIZE_MIDDLE, SIZE_MAXI] = [0, 100, 200]
+
+DEFAULT_CANVAS_HEIGHT = 200.
+CANVAS_BORDER = (20., 10.)
+CANVAS_PADDING = 8.5
+VALUE_LABEL_HEIGHT = 17.
+AXES_LABEL_HEIGHT = 12.75
+
+COLOR_CYCLE = ['r', 'b', 'g', 'm', 'y', 'k']
+CURSOR_COLOR = '#800080'
+
+def OrthogonalData(item, start_tick, end_tick):
+    data = item.GetData(start_tick, end_tick)
+    min_value, max_value = item.GetValueRange()
+    if min_value is not None and max_value is not None:
+        center = (min_value + max_value) / 2.
+        range = max(1.0, max_value - min_value)
+    else:
+        center = 0.5
+        range = 1.0
+    return data, center - range * 0.55, center + range * 0.55
+
+class DebugVariableDropTarget(wx.TextDropTarget):
+    
+    def __init__(self, parent, window):
+        wx.TextDropTarget.__init__(self)
+        self.ParentControl = parent
+        self.ParentWindow = window
+        
+    def __del__(self):
+        self.ParentControl = None
+        self.ParentWindow = None
+        
+    def OnDragOver(self, x, y, d):
+        self.ParentControl.OnMouseDragging(x, y)
+        return wx.TextDropTarget.OnDragOver(self, x, y, d)
+        
+    def OnDropText(self, x, y, data):
+        message = None
+        try:
+            values = eval(data)
+            if not isinstance(values, TupleType):
+                raise
+        except:
+            message = _("Invalid value \"%s\" for debug variable")%data
+            values = None
+        
+        if message is not None:
+            wx.CallAfter(self.ShowMessage, message)
+        
+        elif values[1] == "debug":
+            width, height = self.ParentControl.GetSize()
+            target_idx = self.ParentControl.GetIndex()
+            merge_type = GRAPH_PARALLEL
+            if self.ParentControl.Is3DCanvas():
+                if y > height / 2:
+                    target_idx += 1
+                if len(values) > 1 and values[2] == "move":
+                    self.ParentWindow.MoveValue(values[0], target_idx)
+                else:
+                    self.ParentWindow.InsertValue(values[0], target_idx, force=True)
+                
+            else:
+                rect = self.ParentControl.GetAxesBoundingBox()
+                if rect.InsideXY(x, y):
+                    merge_rect = wx.Rect(rect.x, rect.y, rect.width / 2., rect.height)
+                    if merge_rect.InsideXY(x, y):
+                        merge_type = GRAPH_ORTHOGONAL
+                    wx.CallAfter(self.ParentWindow.MergeGraphs, values[0], target_idx, merge_type, force=True)
+                else:
+                    if y > height / 2:
+                        target_idx += 1
+                    if len(values) > 2 and values[2] == "move":
+                        self.ParentWindow.MoveValue(values[0], target_idx)
+                    else:
+                        self.ParentWindow.InsertValue(values[0], target_idx, force=True)
+    
+    def OnLeave(self):
+        self.ParentWindow.ResetHighlight()
+        return wx.TextDropTarget.OnLeave(self)
+    
+    def ShowMessage(self, message):
+        dialog = wx.MessageDialog(self.ParentWindow, message, _("Error"), wx.OK|wx.ICON_ERROR)
+        dialog.ShowModal()
+        dialog.Destroy()
+
+
+class DebugVariableGraphicViewer(DebugVariableViewer, FigureCanvas):
+    
+    def __init__(self, parent, window, items, graph_type):
+        DebugVariableViewer.__init__(self, window, items)
+        
+        self.CanvasSize = SIZE_MINI
+        self.GraphType = graph_type
+        self.CursorTick = None
+        self.MouseStartPos = None
+        self.StartCursorTick = None
+        self.CanvasStartSize = None
+        self.ContextualButtons = []
+        self.ContextualButtonsItem = None
+        
+        self.Figure = matplotlib.figure.Figure(facecolor='w')
+        self.Figure.subplotpars.update(top=0.95, left=0.1, bottom=0.1, right=0.95)
+        
+        FigureCanvas.__init__(self, parent, -1, self.Figure)
+        self.SetWindowStyle(wx.WANTS_CHARS)
+        self.SetBackgroundColour(wx.WHITE)
+        self.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
+        self.Bind(wx.EVT_ENTER_WINDOW, self.OnEnter)
+        self.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeave)
+        self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)
+        self.Bind(wx.EVT_SIZE, self.OnResize)
+        
+        canvas_size = self.GetCanvasMinSize()
+        self.SetMinSize(canvas_size)
+        self.SetDropTarget(DebugVariableDropTarget(self, window))
+        self.mpl_connect('button_press_event', self.OnCanvasButtonPressed)
+        self.mpl_connect('motion_notify_event', self.OnCanvasMotion)
+        self.mpl_connect('button_release_event', self.OnCanvasButtonReleased)
+        self.mpl_connect('scroll_event', self.OnCanvasScroll)
+        
+        for size, bitmap in zip([SIZE_MINI, SIZE_MIDDLE, SIZE_MAXI],
+                                ["minimize_graph", "middle_graph", "maximize_graph"]):
+            self.Buttons.append(GraphButton(0, 0, bitmap, self.GetOnChangeSizeButton(size)))
+        for bitmap, callback in [("export_graph_mini", self.OnExportGraphButton),
+                                 ("delete_graph", self.OnCloseButton)]:
+            self.Buttons.append(GraphButton(0, 0, bitmap, callback))
+        
+        self.ResetGraphics()
+        self.RefreshLabelsPosition(canvas_size.height)
+        self.ShowButtons(False)
+    
+    def draw(self, drawDC=None):
+        FigureCanvasAgg.draw(self)
+
+        self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
+        self.bitmap.UseAlpha() 
+        width, height = self.GetSize()
+        bbox = self.GetAxesBoundingBox()
+        
+        destDC = wx.MemoryDC()
+        destDC.SelectObject(self.bitmap)
+        
+        destGC = wx.GCDC(destDC)
+        
+        destGC.BeginDrawing()
+        if self.Highlight == HIGHLIGHT_RESIZE:
+            destGC.SetPen(HIGHLIGHT_RESIZE_PEN)
+            destGC.SetBrush(HIGHLIGHT_RESIZE_BRUSH)
+            destGC.DrawRectangle(0, height - 5, width, 5)
+        else:
+            destGC.SetPen(HIGHLIGHT_DROP_PEN)
+            destGC.SetBrush(HIGHLIGHT_DROP_BRUSH)
+            if self.Highlight == HIGHLIGHT_LEFT:
+                destGC.DrawRectangle(bbox.x, bbox.y, 
+                                     bbox.width / 2, bbox.height)
+            elif self.Highlight == HIGHLIGHT_RIGHT:
+                destGC.DrawRectangle(bbox.x + bbox.width / 2, bbox.y, 
+                                     bbox.width / 2, bbox.height)
+        
+        self.DrawCommonElements(destGC, self.GetButtons())
+        
+        destGC.EndDrawing()
+        
+        self._isDrawn = True
+        self.gui_repaint(drawDC=drawDC)
+    
+    def GetButtons(self):
+        return self.Buttons + self.ContextualButtons
+    
+    def PopupContextualButtons(self, item, rect, style=wx.RIGHT):
+        if self.ContextualButtonsItem is not None and item != self.ContextualButtonsItem:
+            self.DismissContextualButtons()
+        
+        if self.ContextualButtonsItem is None:
+            self.ContextualButtonsItem = item
+            
+            if self.ContextualButtonsItem.IsForced():
+                self.ContextualButtons.append(
+                    GraphButton(0, 0, "release", self.OnReleaseButton))
+            for bitmap, callback in [("force", self.OnForceButton),
+                                     ("export_graph_mini", self.OnExportItemGraphButton),
+                                     ("delete_graph", self.OnRemoveItemButton)]:
+                self.ContextualButtons.append(GraphButton(0, 0, bitmap, callback))
+            
+            offset = 0
+            buttons = self.ContextualButtons[:]
+            if style in [wx.TOP, wx.LEFT]:
+                 buttons.reverse()
+            for button in buttons:
+                w, h = button.GetSize()
+                if style in [wx.LEFT, wx.RIGHT]:
+                    x = rect.x + (- w - offset
+                                if style == wx.LEFT
+                                else rect.width + offset)
+                    y = rect.y + (rect.height - h) / 2
+                    offset += w
+                else:
+                    x = rect.x + (rect.width - w ) / 2
+                    y = rect.y + (- h - offset
+                                  if style == wx.TOP
+                                  else rect.height + offset)
+                    offset += h
+                button.SetPosition(x, y)
+            self.ParentWindow.ForceRefresh()
+    
+    def DismissContextualButtons(self):
+        if self.ContextualButtonsItem is not None:
+            self.ContextualButtonsItem = None
+            self.ContextualButtons = []
+            self.ParentWindow.ForceRefresh()
+    
+    def IsOverContextualButton(self, x, y):
+        for button in self.ContextualButtons:
+            if button.HitTest(x, y):
+                return True
+        return False
+    
+    def SetMinSize(self, size):
+        wx.Window.SetMinSize(self, size)
+        wx.CallAfter(self.RefreshButtonsPosition)
+    
+    def GetOnChangeSizeButton(self, size):
+        def OnChangeSizeButton():
+            self.CanvasSize = size
+            self.SetCanvasSize(200, self.CanvasSize)
+        return OnChangeSizeButton
+    
+    def OnExportGraphButton(self):
+        self.ExportGraph()
+    
+    def OnForceButton(self):
+        self.ForceValue(self.ContextualButtonsItem)
+        self.DismissContextualButtons()
+        
+    def OnReleaseButton(self):
+        self.ReleaseValue(self.ContextualButtonsItem)
+        self.DismissContextualButtons()
+    
+    def OnExportItemGraphButton(self):
+        self.ExportGraph(self.ContextualButtonsItem)
+        self.DismissContextualButtons()
+        
+    def OnRemoveItemButton(self):            
+        wx.CallAfter(self.ParentWindow.DeleteValue, self, 
+                     self.ContextualButtonsItem)
+        self.DismissContextualButtons()
+    
+    def OnLeave(self, event):
+        if self.Highlight != HIGHLIGHT_RESIZE or self.CanvasStartSize is None:
+            DebugVariableViewer.OnLeave(self, event)
+        else:
+            event.Skip()
+    
+    def RefreshLabelsPosition(self, height):
+        canvas_ratio = 1. / height
+        graph_ratio = 1. / ((1.0 - (CANVAS_BORDER[0] + CANVAS_BORDER[1]) * canvas_ratio) * height)
+        
+        self.Figure.subplotpars.update(
+            top= 1.0 - CANVAS_BORDER[1] * canvas_ratio, 
+            bottom= CANVAS_BORDER[0] * canvas_ratio)
+        
+        if self.GraphType == GRAPH_PARALLEL or self.Is3DCanvas():
+            num_item = len(self.Items)
+            for idx in xrange(num_item):
+                if not self.Is3DCanvas():
+                    self.AxesLabels[idx].set_position(
+                        (0.05, 
+                         1.0 - (CANVAS_PADDING + AXES_LABEL_HEIGHT * idx) * graph_ratio))
+                self.Labels[idx].set_position(
+                    (0.95, 
+                     CANVAS_PADDING * graph_ratio + 
+                     (num_item - idx - 1) * VALUE_LABEL_HEIGHT * graph_ratio))
+        else:
+            self.AxesLabels[0].set_position((0.1, CANVAS_PADDING * graph_ratio))
+            self.Labels[0].set_position((0.95, CANVAS_PADDING * graph_ratio))
+            self.AxesLabels[1].set_position((0.05, 2 * CANVAS_PADDING * graph_ratio))
+            self.Labels[1].set_position((0.05, 1.0 - CANVAS_PADDING * graph_ratio))
+    
+        self.Figure.subplots_adjust()
+    
+    def GetCanvasMinSize(self):
+        return wx.Size(200, 
+                       CANVAS_BORDER[0] + CANVAS_BORDER[1] + 
+                       2 * CANVAS_PADDING + VALUE_LABEL_HEIGHT * len(self.Items))
+    
+    def SetCanvasSize(self, width, height):
+        height = max(height, self.GetCanvasMinSize()[1])
+        self.SetMinSize(wx.Size(width, height))
+        self.RefreshLabelsPosition(height)
+        self.RefreshButtonsPosition()
+        self.ParentWindow.RefreshGraphicsSizer()
+        
+    def GetAxesBoundingBox(self, absolute=False):
+        width, height = self.GetSize()
+        ax, ay, aw, ah = self.figure.gca().get_position().bounds
+        bbox = wx.Rect(ax * width, height - (ay + ah) * height - 1,
+                       aw * width + 2, ah * height + 1)
+        if absolute:
+            xw, yw = self.GetPosition()
+            bbox.x += xw
+            bbox.y += yw
+        return bbox
+    
+    def OnCanvasButtonPressed(self, event):
+        width, height = self.GetSize()
+        x, y = event.x, height - event.y
+        if not self.IsOverButton(x, y):
+            if event.inaxes == self.Axes:
+                item_idx = None
+                for i, t in ([pair for pair in enumerate(self.AxesLabels)] + 
+                             [pair for pair in enumerate(self.Labels)]):
+                    (x0, y0), (x1, y1) = t.get_window_extent().get_points()
+                    rect = wx.Rect(x0, height - y1, x1 - x0, y1 - y0)
+                    if rect.InsideXY(x, y):
+                        item_idx = i
+                        break
+                if item_idx is not None:
+                    self.ShowButtons(False)
+                    self.DismissContextualButtons()
+                    xw, yw = self.GetPosition()
+                    self.ParentWindow.StartDragNDrop(self, 
+                        self.ItemsDict.values()[item_idx], x + xw, y + yw, x + xw, y + yw)
+                elif not self.Is3DCanvas():
+                    self.MouseStartPos = wx.Point(x, y)
+                    if event.button == 1 and event.inaxes == self.Axes:
+                        self.StartCursorTick = self.CursorTick
+                        self.HandleCursorMove(event)
+                    elif event.button == 2 and self.GraphType == GRAPH_PARALLEL:
+                        width, height = self.GetSize()
+                        start_tick, end_tick = self.ParentWindow.GetRange()
+                        self.StartCursorTick = start_tick
+            
+            elif event.button == 1 and event.y <= 5:
+                self.MouseStartPos = wx.Point(x, y)
+                self.CanvasStartSize = self.GetSize()
+    
+    def OnCanvasButtonReleased(self, event):
+        if self.ParentWindow.IsDragging():
+            width, height = self.GetSize()
+            xw, yw = self.GetPosition()
+            self.ParentWindow.StopDragNDrop(
+                self.ParentWindow.DraggingAxesPanel.ItemsDict.values()[0].GetVariable(),
+                xw + event.x, 
+                yw + height - event.y)
+        else:
+            self.MouseStartPos = None
+            self.StartCursorTick = None
+            self.CanvasStartSize = None
+            width, height = self.GetSize()
+            self.HandleButton(event.x, height - event.y)
+            if event.y > 5 and self.SetHighlight(HIGHLIGHT_NONE):
+                self.SetCursor(wx.NullCursor)
+                self.ParentWindow.ForceRefresh()
+    
+    def OnCanvasMotion(self, event):
+        width, height = self.GetSize()
+        if self.ParentWindow.IsDragging():
+            xw, yw = self.GetPosition()
+            self.ParentWindow.MoveDragNDrop(
+                xw + event.x, 
+                yw + height - event.y)
+        else:
+            if not self.Is3DCanvas():
+                if event.button == 1 and self.CanvasStartSize is None:
+                    if event.inaxes == self.Axes:
+                        if self.MouseStartPos is not None:
+                            self.HandleCursorMove(event)
+                    elif self.MouseStartPos is not None and len(self.Items) == 1:
+                        xw, yw = self.GetPosition()
+                        self.ParentWindow.SetCursorTick(self.StartCursorTick)
+                        self.ParentWindow.StartDragNDrop(self, 
+                            self.ItemsDict.values()[0],
+                            event.x + xw, height - event.y + yw, 
+                            self.MouseStartPos.x + xw, self.MouseStartPos.y + yw)
+                elif event.button == 2 and self.GraphType == GRAPH_PARALLEL and self.MouseStartPos is not None:
+                    start_tick, end_tick = self.ParentWindow.GetRange()
+                    rect = self.GetAxesBoundingBox()
+                    self.ParentWindow.SetCanvasPosition(
+                        self.StartCursorTick + (self.MouseStartPos.x - event.x) *
+                        (end_tick - start_tick) / rect.width)    
+            
+            if event.button == 1 and self.CanvasStartSize is not None:
+                width, height = self.GetSize()
+                self.SetCanvasSize(width, 
+                    self.CanvasStartSize.height + height - event.y - self.MouseStartPos.y)
+                
+            elif event.button in [None, "up", "down"]:
+                if self.GraphType == GRAPH_PARALLEL:
+                    orientation = [wx.RIGHT] * len(self.AxesLabels) + [wx.LEFT] * len(self.Labels)
+                elif len(self.AxesLabels) > 0:
+                    orientation = [wx.RIGHT, wx.TOP, wx.LEFT, wx.BOTTOM]
+                else:
+                    orientation = [wx.LEFT] * len(self.Labels)
+                item_idx = None
+                item_style = None
+                for (i, t), style in zip([pair for pair in enumerate(self.AxesLabels)] + 
+                                         [pair for pair in enumerate(self.Labels)], 
+                                         orientation):
+                    (x0, y0), (x1, y1) = t.get_window_extent().get_points()
+                    rect = wx.Rect(x0, height - y1, x1 - x0, y1 - y0)
+                    if rect.InsideXY(event.x, height - event.y):
+                        item_idx = i
+                        item_style = style
+                        break
+                if item_idx is not None:
+                    self.PopupContextualButtons(self.ItemsDict.values()[item_idx], rect, item_style)
+                    return 
+                if not self.IsOverContextualButton(event.x, height - event.y):
+                    self.DismissContextualButtons()
+                
+                if event.y <= 5:
+                    if self.SetHighlight(HIGHLIGHT_RESIZE):
+                        self.SetCursor(wx.StockCursor(wx.CURSOR_SIZENS))
+                        self.ParentWindow.ForceRefresh()
+                else:
+                    if self.SetHighlight(HIGHLIGHT_NONE):
+                        self.SetCursor(wx.NullCursor)
+                        self.ParentWindow.ForceRefresh()
+    
+    def OnCanvasScroll(self, event):
+        if event.inaxes is not None and event.guiEvent.ControlDown():
+            if self.GraphType == GRAPH_ORTHOGONAL:
+                start_tick, end_tick = self.ParentWindow.GetRange()
+                tick = (start_tick + end_tick) / 2.
+            else:
+                tick = event.xdata
+            self.ParentWindow.ChangeRange(int(-event.step) / 3, tick)
+            self.ParentWindow.VetoScrollEvent = True
+    
+    def RefreshHighlight(self, x, y):
+        width, height = self.GetSize()
+        bbox = self.GetAxesBoundingBox()
+        if bbox.InsideXY(x, y) and not self.Is3DCanvas():
+            rect = wx.Rect(bbox.x, bbox.y, bbox.width / 2, bbox.height)
+            if rect.InsideXY(x, y):
+                self.SetHighlight(HIGHLIGHT_LEFT)
+            else:
+                self.SetHighlight(HIGHLIGHT_RIGHT)
+        elif y < height / 2:
+            if self.ParentWindow.IsViewerFirst(self):
+                self.SetHighlight(HIGHLIGHT_BEFORE)
+            else:
+                self.SetHighlight(HIGHLIGHT_NONE)
+                self.ParentWindow.HighlightPreviousViewer(self)
+        else:
+            self.SetHighlight(HIGHLIGHT_AFTER)
+    
+    def OnLeave(self, event):
+        if self.CanvasStartSize is None and self.SetHighlight(HIGHLIGHT_NONE):
+            self.SetCursor(wx.NullCursor)
+            self.ParentWindow.ForceRefresh()
+        DebugVariableViewer.OnLeave(self, event)
+    
+    KEY_CURSOR_INCREMENT = {
+        wx.WXK_LEFT: -1,
+        wx.WXK_RIGHT: 1,
+        wx.WXK_UP: -10,
+        wx.WXK_DOWN: 10}
+    def OnKeyDown(self, event):
+        if self.CursorTick is not None:
+            move = self.KEY_CURSOR_INCREMENT.get(event.GetKeyCode(), None)
+            if move is not None:
+                self.ParentWindow.MoveCursorTick(move)
+        event.Skip()
+    
+    def HandleCursorMove(self, event):
+        start_tick, end_tick = self.ParentWindow.GetRange()
+        cursor_tick = None
+        items = self.ItemsDict.values()
+        if self.GraphType == GRAPH_ORTHOGONAL:
+            x_data = items[0].GetData(start_tick, end_tick)
+            y_data = items[1].GetData(start_tick, end_tick)
+            if len(x_data) > 0 and len(y_data) > 0:
+                length = min(len(x_data), len(y_data))
+                d = numpy.sqrt((x_data[:length,1]-event.xdata) ** 2 + (y_data[:length,1]-event.ydata) ** 2)
+                cursor_tick = x_data[numpy.argmin(d), 0]
+        else:
+            data = items[0].GetData(start_tick, end_tick)
+            if len(data) > 0:
+                cursor_tick = data[numpy.argmin(numpy.abs(data[:,0] - event.xdata)), 0]
+        if cursor_tick is not None:
+            self.ParentWindow.SetCursorTick(cursor_tick)
+    
+    def OnAxesMotion(self, event):
+        if self.Is3DCanvas():
+            current_time = gettime()
+            if current_time - self.LastMotionTime > REFRESH_PERIOD:
+                self.LastMotionTime = current_time
+                Axes3D._on_move(self.Axes, event)
+    
+    def ResetGraphics(self):
+        self.Figure.clear()
+        if self.Is3DCanvas():
+            self.Axes = self.Figure.gca(projection='3d')
+            self.Axes.set_color_cycle(['b'])
+            self.LastMotionTime = gettime()
+            setattr(self.Axes, "_on_move", self.OnAxesMotion)
+            self.Axes.mouse_init()
+            self.Axes.tick_params(axis='z', labelsize='small')
+        else:
+            self.Axes = self.Figure.gca()
+            self.Axes.set_color_cycle(COLOR_CYCLE)
+        self.Axes.tick_params(axis='x', labelsize='small')
+        self.Axes.tick_params(axis='y', labelsize='small')
+        self.Plots = []
+        self.VLine = None
+        self.HLine = None
+        self.Labels = []
+        self.AxesLabels = []
+        if not self.Is3DCanvas():
+            text_func = self.Axes.text
+        else:
+            text_func = self.Axes.text2D
+        if self.GraphType == GRAPH_PARALLEL or self.Is3DCanvas():
+            num_item = len(self.Items)
+            for idx in xrange(num_item):
+                if num_item == 1:
+                    color = 'k'
+                else:
+                    color = COLOR_CYCLE[idx % len(COLOR_CYCLE)]
+                if not self.Is3DCanvas():
+                    self.AxesLabels.append(
+                        text_func(0, 0, "", size='small',
+                                  verticalalignment='top', 
+                                  color=color,
+                                  transform=self.Axes.transAxes))
+                self.Labels.append(
+                    text_func(0, 0, "", size='large', 
+                              horizontalalignment='right',
+                              color=color,
+                              transform=self.Axes.transAxes))
+        else:
+            self.AxesLabels.append(
+                self.Axes.text(0, 0, "", size='small',
+                               transform=self.Axes.transAxes))
+            self.Labels.append(
+                self.Axes.text(0, 0, "", size='large',
+                               horizontalalignment='right',
+                               transform=self.Axes.transAxes))
+            self.AxesLabels.append(
+                self.Axes.text(0, 0, "", size='small',
+                               rotation='vertical',
+                               verticalalignment='bottom',
+                               transform=self.Axes.transAxes))
+            self.Labels.append(
+                self.Axes.text(0, 0, "", size='large',
+                               rotation='vertical',
+                               verticalalignment='top',
+                               transform=self.Axes.transAxes))
+        width, height = self.GetSize()
+        self.RefreshLabelsPosition(height)
+        
+    def AddItem(self, item):
+        DebugVariableViewer.AddItem(self, item)
+        self.ResetGraphics()
+        
+    def RemoveItem(self, item):
+        DebugVariableViewer.RemoveItem(self, item)
+        if not self.ItemsIsEmpty():
+            if len(self.Items) == 1:
+                self.GraphType = GRAPH_PARALLEL
+            self.ResetGraphics()
+    
+    def UnsubscribeObsoleteData(self):
+        DebugVariableViewer.UnsubscribeObsoleteData(self)
+        if not self.ItemsIsEmpty():
+            self.ResetGraphics()
+    
+    def Is3DCanvas(self):
+        return self.GraphType == GRAPH_ORTHOGONAL and len(self.Items) == 3
+    
+    def SetCursorTick(self, cursor_tick):
+        self.CursorTick = cursor_tick
+        
+    def RefreshViewer(self, refresh_graphics=True):
+        
+        if refresh_graphics:
+            start_tick, end_tick = self.ParentWindow.GetRange()
+            
+            if self.GraphType == GRAPH_PARALLEL:    
+                min_value = max_value = None
+                
+                for idx, item in enumerate(self.Items):
+                    data = item.GetData(start_tick, end_tick)
+                    if data is not None:
+                        item_min_value, item_max_value = item.GetValueRange()
+                        if min_value is None:
+                            min_value = item_min_value
+                        elif item_min_value is not None:
+                            min_value = min(min_value, item_min_value)
+                        if max_value is None:
+                            max_value = item_max_value
+                        elif item_max_value is not None:
+                            max_value = max(max_value, item_max_value)
+                        
+                        if len(self.Plots) <= idx:
+                            self.Plots.append(
+                                self.Axes.plot(data[:, 0], data[:, 1])[0])
+                        else:
+                            self.Plots[idx].set_data(data[:, 0], data[:, 1])
+                    
+                if min_value is not None and max_value is not None:
+                    y_center = (min_value + max_value) / 2.
+                    y_range = max(1.0, max_value - min_value)
+                else:
+                    y_center = 0.5
+                    y_range = 1.0
+                x_min, x_max = start_tick, end_tick
+                y_min, y_max = y_center - y_range * 0.55, y_center + y_range * 0.55
+                
+                if self.CursorTick is not None and start_tick <= self.CursorTick <= end_tick:
+                    if self.VLine is None:
+                        self.VLine = self.Axes.axvline(self.CursorTick, color=CURSOR_COLOR)
+                    else:
+                        self.VLine.set_xdata((self.CursorTick, self.CursorTick))
+                    self.VLine.set_visible(True)
+                else:
+                    if self.VLine is not None:
+                        self.VLine.set_visible(False)
+            else:
+                min_start_tick = reduce(max, [item.GetData()[0, 0] 
+                                              for item in self.Items
+                                              if len(item.GetData()) > 0], 0)
+                start_tick = max(start_tick, min_start_tick)
+                end_tick = max(end_tick, min_start_tick)
+                items = self.ItemsDict.values()
+                x_data, x_min, x_max = OrthogonalData(items[0], start_tick, end_tick)
+                y_data, y_min, y_max = OrthogonalData(items[1], start_tick, end_tick)
+                if self.CursorTick is not None:
+                    x_cursor, x_forced = items[0].GetValue(self.CursorTick, raw=True)
+                    y_cursor, y_forced = items[1].GetValue(self.CursorTick, raw=True)
+                length = 0
+                if x_data is not None and y_data is not None:  
+                    length = min(len(x_data), len(y_data))
+                if len(self.Items) < 3:
+                    if x_data is not None and y_data is not None:
+                        if len(self.Plots) == 0:
+                            self.Plots.append(
+                                self.Axes.plot(x_data[:, 1][:length], 
+                                               y_data[:, 1][:length])[0])
+                        else:
+                            self.Plots[0].set_data(
+                                x_data[:, 1][:length], 
+                                y_data[:, 1][:length])
+                    
+                    if self.CursorTick is not None and start_tick <= self.CursorTick <= end_tick:
+                        if self.VLine is None:
+                            self.VLine = self.Axes.axvline(x_cursor, color=CURSOR_COLOR)
+                        else:
+                            self.VLine.set_xdata((x_cursor, x_cursor))
+                        if self.HLine is None:
+                            self.HLine = self.Axes.axhline(y_cursor, color=CURSOR_COLOR)
+                        else:
+                            self.HLine.set_ydata((y_cursor, y_cursor))
+                        self.VLine.set_visible(True)
+                        self.HLine.set_visible(True)
+                    else:
+                        if self.VLine is not None:
+                            self.VLine.set_visible(False)
+                        if self.HLine is not None:
+                            self.HLine.set_visible(False)
+                else:
+                    while len(self.Axes.lines) > 0:
+                        self.Axes.lines.pop()
+                    z_data, z_min, z_max = OrthogonalData(items[2], start_tick, end_tick)
+                    if self.CursorTick is not None:
+                        z_cursor, z_forced = items[2].GetValue(self.CursorTick, raw=True)
+                    if x_data is not None and y_data is not None and z_data is not None:
+                        length = min(length, len(z_data))
+                        self.Axes.plot(x_data[:, 1][:length],
+                                       y_data[:, 1][:length],
+                                       zs = z_data[:, 1][:length])
+                    self.Axes.set_zlim(z_min, z_max)
+                    if self.CursorTick is not None and start_tick <= self.CursorTick <= end_tick:
+                        for kwargs in [{"xs": numpy.array([x_min, x_max])},
+                                       {"ys": numpy.array([y_min, y_max])},
+                                       {"zs": numpy.array([z_min, z_max])}]:
+                            for param, value in [("xs", numpy.array([x_cursor, x_cursor])),
+                                                 ("ys", numpy.array([y_cursor, y_cursor])),
+                                                 ("zs", numpy.array([z_cursor, z_cursor]))]:
+                                kwargs.setdefault(param, value)
+                            kwargs["color"] = CURSOR_COLOR
+                            self.Axes.plot(**kwargs)
+                
+            self.Axes.set_xlim(x_min, x_max)
+            self.Axes.set_ylim(y_min, y_max)
+        
+        variable_name_mask = self.ParentWindow.GetVariableNameMask()
+        if self.CursorTick is not None:
+            values, forced = apply(zip, [item.GetValue(self.CursorTick) for item in self.Items])
+        else:
+            values, forced = apply(zip, [(item.GetValue(), item.IsForced()) for item in self.Items])
+        labels = [item.GetVariable(variable_name_mask) for item in self.Items]
+        styles = map(lambda x: {True: 'italic', False: 'normal'}[x], forced)
+        if self.Is3DCanvas():
+            for idx, label_func in enumerate([self.Axes.set_xlabel, 
+                                              self.Axes.set_ylabel,
+                                              self.Axes.set_zlabel]):
+                label_func(labels[idx], fontdict={'size': 'small','color': COLOR_CYCLE[idx]})
+        else:
+            for label, text in zip(self.AxesLabels, labels):
+                label.set_text(text)
+        for label, value, style in zip(self.Labels, values, styles):
+            label.set_text(value)
+            label.set_style(style)
+        
+        self.draw()
+
+    def ExportGraph(self, item=None):
+        if item is not None:
+            variables = [(item, [entry for entry in item.GetData()])]
+        else:
+            variables = [(item, [entry for entry in item.GetData()])
+                         for item in self.Items]
+        self.ParentWindow.CopyDataToClipboard(variables)
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/controls/DebugVariablePanel/DebugVariableTextViewer.py	Fri May 31 00:07:21 2013 +0200
@@ -0,0 +1,274 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor
+#based on the plcopen standard. 
+#
+#Copyright (C) 2012: Edouard TISSERANT and Laurent BESSARD
+#
+#See COPYING file for copyrights details.
+#
+#This library is free software; you can redistribute it and/or
+#modify it under the terms of the GNU General Public
+#License as published by the Free Software Foundation; either
+#version 2.1 of the License, or (at your option) any later version.
+#
+#This library is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#General Public License for more details.
+#
+#You should have received a copy of the GNU General Public
+#License along with this library; if not, write to the Free Software
+#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+from types import TupleType
+
+import wx
+
+from DebugVariableItem import DebugVariableItem
+from DebugVariableViewer import DebugVariableViewer
+from GraphButton import GraphButton
+
+#-------------------------------------------------------------------------------
+#                     Debug Variable Text Viewer Drop Target
+#-------------------------------------------------------------------------------
+
+"""
+Class that implements a custom drop target class for Debug Variable Text Viewer
+"""
+
+class DebugVariableTextDropTarget(wx.TextDropTarget):
+    
+    def __init__(self, parent, window):
+        """
+        Constructor
+        @param parent: Reference to Debug Variable Text Viewer
+        @param window: Reference to the Debug Variable Panel
+        """
+        wx.TextDropTarget.__init__(self)
+        self.ParentControl = parent
+        self.ParentWindow = window
+    
+    def __del__(self):
+        """
+        Destructor
+        """
+        # Remove reference to Debug Variable Text Viewer and Debug Variable
+        # Panel
+        self.ParentControl = None
+        self.ParentWindow = None
+        
+    def OnDragOver(self, x, y, d):
+        """
+        Function called when mouse is dragged over Drop Target
+        @param x: X coordinate of mouse pointer
+        @param y: Y coordinate of mouse pointer
+        @param d: Suggested default for return value
+        """
+        # Signal parent that mouse is dragged over
+        self.ParentControl.OnMouseDragging(x, y)
+        
+        return wx.TextDropTarget.OnDragOver(self, x, y, d)
+        
+    def OnDropText(self, x, y, data):
+        """
+        Function called when mouse is dragged over Drop Target
+        @param x: X coordinate of mouse pointer
+        @param y: Y coordinate of mouse pointer
+        @param data: Text associated to drag'n drop
+        """
+        message = None
+        
+        # Check that data is valid regarding DebugVariablePanel
+        try:
+            values = eval(data)
+            if not isinstance(values, TupleType):
+                raise
+        except:
+            message = _("Invalid value \"%s\" for debug variable") % data
+            values = None
+        
+        # Display message if data is invalid
+        if message is not None:
+            wx.CallAfter(self.ShowMessage, message)
+        
+        # Data contain a reference to a variable to debug
+        elif values[1] == "debug":
+            
+            # Get Before which Viewer the variable has to be moved or added
+            # according to the position of mouse in Viewer.
+            width, height = self.ParentControl.GetSize()
+            target_idx = self.ParentControl.GetIndex()
+            if y > height / 2:
+                target_idx += 1
+            
+            # Drag'n Drop is an internal is an internal move inside Debug
+            # Variable Panel 
+            if len(values) > 2 and values[2] == "move":
+                self.ParentWindow.MoveValue(values[0], 
+                                            target_idx)
+            
+            # Drag'n Drop was initiated by another control of Beremiz
+            else:
+                self.ParentWindow.InsertValue(values[0], 
+                                              target_idx, 
+                                              force=True)
+    
+    def OnLeave(self):
+        """
+        Function called when mouse is leave Drop Target
+        """
+        # Signal Debug Variable Panel to reset highlight
+        self.ParentWindow.ResetHighlight()
+        
+        return wx.TextDropTarget.OnLeave(self)
+    
+    def ShowMessage(self, message):
+        """
+        Show error message in Error Dialog
+        @param message: Error message to display
+        """
+        dialog = wx.MessageDialog(self.ParentWindow, 
+                                  message, 
+                                  _("Error"), 
+                                  wx.OK|wx.ICON_ERROR)
+        dialog.ShowModal()
+        dialog.Destroy()
+
+
+#-------------------------------------------------------------------------------
+#                      Debug Variable Text Viewer Class
+#-------------------------------------------------------------------------------
+
+"""
+Class that implements a Viewer that display variable values as a text
+"""
+
+class DebugVariableTextViewer(DebugVariableViewer, wx.Panel):
+    
+    def __init__(self, parent, window, items=[]):
+        """
+        Constructor
+        @param parent: Parent wx.Window of DebugVariableText
+        @param window: Reference to the Debug Variable Panel
+        @param items: List of DebugVariableItem displayed by Viewer
+        """
+        DebugVariableViewer.__init__(self, window, items)
+        
+        wx.Panel.__init__(self, parent)
+        # Set panel background colour
+        self.SetBackgroundColour(wx.WHITE)
+        # Define panel drop target
+        self.SetDropTarget(DebugVariableTextDropTarget(self, window))
+        
+        # Bind events
+        self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
+        self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
+        self.Bind(wx.EVT_ENTER_WINDOW, self.OnEnter)
+        self.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeave)
+        self.Bind(wx.EVT_SIZE, self.OnResize)
+        self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)
+        self.Bind(wx.EVT_PAINT, self.OnPaint)
+        
+        # Define panel min size for parent sizer layout
+        self.SetMinSize(wx.Size(0, 25))
+        
+        # Add buttons to Viewer
+        for bitmap, callback in [("force", self.OnForceButton),
+                                 ("release", self.OnReleaseButton),
+                                 ("delete_graph", self.OnCloseButton)]:
+            self.Buttons.append(GraphButton(0, 0, bitmap, callback))
+        
+        # Hide buttons until mouse enter Viewer
+        self.ShowButtons(False)
+    
+    def RefreshViewer(self):
+        """
+        Method that refresh the content displayed by Viewer
+        """
+        # Create buffered DC for drawing in panel
+        width, height = self.GetSize()
+        bitmap = wx.EmptyBitmap(width, height)
+        dc = wx.BufferedDC(wx.ClientDC(self), bitmap)
+        dc.Clear()
+        dc.BeginDrawing()
+        
+        # Get Graphics Context for DC, for anti-aliased and transparent
+        # rendering
+        gc = wx.GCDC(dc)
+        
+        # Get first item
+        item = self.ItemsDict.values()[0]
+        
+        # Get item variable path masked according Debug Variable Panel mask
+        item_path = item.GetVariable(
+                self.ParentWindow.GetVariableNameMask())
+        
+        # Draw item variable path at Viewer left side
+        w, h = gc.GetTextExtent(item_path)
+        gc.DrawText(item_path, 20, (height - h) / 2)
+        
+        # Update 'Release' button state and text color according to item forced
+        # flag value
+        item_forced = item.IsForced()
+        self.Buttons[1].Enable(item_forced)
+        self.RefreshButtonsPosition()
+        if item_forced:
+            gc.SetTextForeground(wx.BLUE)
+        
+        # Draw item current value at right side of Viewer
+        item_value = item.GetValue()
+        w, h = gc.GetTextExtent(item_value)
+        gc.DrawText(item_value, width - 40 - w, (height - h) / 2)
+        
+        # Draw other Viewer common elements
+        self.DrawCommonElements(gc)
+        
+        gc.EndDrawing()
+    
+    def OnLeftDown(self, event):
+        """
+        Function called when mouse left button is pressed
+        @param event: wx.MouseEvent
+        """
+        # Get first item
+        item = self.ItemsDict.values()[0]
+        
+        # Calculate item path bounding box
+        width, height = self.GetSize()
+        item_path = item.GetVariable(
+                self.ParentWindow.GetVariableNameMask())
+        w, h = self.GetTextExtent(item_path)
+        
+        # Test if mouse has been pressed in this bounding box. In that case
+        # start a move drag'n drop of item variable 
+        x, y = event.GetPosition()
+        item_path_bbox = wx.Rect(20, (height - h) / 2, w, h)
+        if item_path_bbox.InsideXY(x, y):
+            data = wx.TextDataObject(str((item.GetVariable(), "debug", "move")))
+            dragSource = wx.DropSource(self)
+            dragSource.SetData(data)
+            dragSource.DoDragDrop()
+        
+        # In other case handle event normally
+        else:
+            event.Skip()
+    
+    def OnLeftUp(self, event):
+        """
+        Function called when mouse left button is released
+        @param event: wx.MouseEvent
+        """
+        # Execute callback on button under mouse pointer if it exists
+        x, y = event.GetPosition()
+        wx.CallAfter(self.HandleButton, x, y)
+        event.Skip()
+    
+    def OnPaint(self, event):
+        """
+        Function called when redrawing Viewer content is needed
+        @param event: wx.PaintEvent
+        """
+        self.RefreshViewer()
+        event.Skip()
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/controls/DebugVariablePanel/DebugVariableViewer.py	Fri May 31 00:07:21 2013 +0200
@@ -0,0 +1,420 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor
+#based on the plcopen standard. 
+#
+#Copyright (C) 2012: Edouard TISSERANT and Laurent BESSARD
+#
+#See COPYING file for copyrights details.
+#
+#This library is free software; you can redistribute it and/or
+#modify it under the terms of the GNU General Public
+#License as published by the Free Software Foundation; either
+#version 2.1 of the License, or (at your option) any later version.
+#
+#This library is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#General Public License for more details.
+#
+#You should have received a copy of the GNU General Public
+#License along with this library; if not, write to the Free Software
+#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+from collections import OrderedDict
+
+import wx
+
+import matplotlib
+matplotlib.use('WX')
+import matplotlib.pyplot
+from matplotlib.backends.backend_wxagg import _convert_agg_to_wx_bitmap
+
+from dialogs.ForceVariableDialog import ForceVariableDialog
+
+# Viewer highlight types
+[HIGHLIGHT_NONE,
+ HIGHLIGHT_BEFORE,
+ HIGHLIGHT_AFTER,
+ HIGHLIGHT_LEFT,
+ HIGHLIGHT_RIGHT,
+ HIGHLIGHT_RESIZE] = range(6)
+
+# Viewer highlight styles
+HIGHLIGHT_DROP_PEN = wx.Pen(wx.Colour(0, 128, 255))
+HIGHLIGHT_DROP_BRUSH = wx.Brush(wx.Colour(0, 128, 255, 128))
+HIGHLIGHT_RESIZE_PEN = wx.Pen(wx.Colour(200, 200, 200))
+HIGHLIGHT_RESIZE_BRUSH = wx.Brush(wx.Colour(200, 200, 200))
+
+#-------------------------------------------------------------------------------
+#                        Base Debug Variable Viewer Class
+#-------------------------------------------------------------------------------
+
+"""
+Class that implements a generic viewer that display a list of variable values
+This class has to be inherited to effectively display variable values
+"""
+
+class DebugVariableViewer:
+    
+    def __init__(self, window, items=[]):
+        """
+        Constructor
+        @param window: Reference to the Debug Variable Panel
+        @param items: List of DebugVariableItem displayed by Viewer
+        """
+        self.ParentWindow = window
+        self.ItemsDict = OrderedDict([(item.GetVariable(), item)
+                                      for item in items])
+        self.Items = self.ItemsDict.viewvalues()
+        
+        # Variable storing current highlight displayed in Viewer
+        self.Highlight = HIGHLIGHT_NONE
+        # List of buttons
+        self.Buttons = []
+    
+    def __del__(self):
+        """
+        Destructor
+        """
+        # Remove reference to Debug Variable Panel
+        self.ParentWindow = None
+    
+    def GetIndex(self):
+        """
+        Return position of Viewer in Debug Variable Panel
+        @return: Position of Viewer
+        """
+        return self.ParentWindow.GetViewerIndex(self)
+    
+    def GetItem(self, variable):
+        """
+        Return item storing values of a variable
+        @param variable: Variable path
+        @return: Item storing values of this variable
+        """
+        return self.ItemsDict.get(variable, None)
+    
+    def GetItems(self):
+        """
+        Return items displayed by Viewer
+        @return: List of items displayed in Viewer
+        """
+        return self.Items
+    
+    def AddItem(self, item):
+        """
+        Add an item to the list of items displayed by Viewer
+        @param item: Item to add to the list
+        """
+        self.ItemsDict[item.GetVariable()] = item
+        
+    def RemoveItem(self, item):
+        """
+        Remove an item from the list of items displayed by Viewer
+        @param item: Item to remove from the list
+        """
+        self.ItemsDict.pop(item.GetVariable(), None)
+    
+    def ClearItems(self):
+        """
+        Clear list of items displayed by Viewer
+        """
+        # Unsubscribe every items of the list
+        for item in self.Items:
+            self.ParentWindow.RemoveDataConsumer(item)
+        
+        # Clear list
+        self.Items.clear()
+        
+    def ItemsIsEmpty(self):
+        """
+        Return if list of items displayed by Viewer is empty
+        @return: True if list is empty
+        """
+        return len(self.Items) == 0
+    
+    def UnsubscribeObsoleteData(self):
+        """
+        Function that unsubscribe and remove every item that store values of
+        a variable that doesn't exist in PLC anymore
+        """
+        for item in self.ItemsDict.values()[:]:
+            iec_path = item.GetVariable()
+            
+            # Check that variablepath exist in PLC
+            if self.ParentWindow.GetDataType(iec_path) is None:
+                # If not, unsubscribe and remove it
+                self.ParentWindow.RemoveDataConsumer(item)
+                self.RemoveItem(item)
+            else:
+                # If it exist, resubscribe and refresh data type
+                self.ParentWindow.AddDataConsumer(iec_path.upper(), item)
+                item.RefreshVariableType()
+    
+    def ResetItemsData(self):
+        """
+        Reset data stored in every items displayed in Viewer
+        """
+        for item in self.Items:
+            item.ResetData()
+    
+    def RefreshViewer(self):
+        """
+        Method that refresh the content displayed by Viewer
+        Need to be overridden by inherited classes
+        """
+        pass
+    
+    def SetHighlight(self, highlight):
+        """
+        Set Highlight type displayed in Viewer
+        @return: True if highlight has changed
+        """
+        # Return immediately if highlight don't change
+        if self.Highlight == highlight:
+            return False
+        
+        self.Highlight = highlight
+        return True
+    
+    def GetButtons(self):
+        """
+        Return list of buttons defined in Viewer
+        @return: List of buttons
+        """
+        return self.Buttons
+    
+    def IsOverButton(self, x, y):
+        """
+        Return if point is over one button of Viewer
+        @param x: X coordinate of point
+        @param y: Y coordinate of point
+        @return: button where point is over
+        """
+        for button in self.GetButtons():
+            if button.HitTest(x, y):
+                return button
+        return None
+    
+    def HandleButton(self, x, y):
+        """
+        Search for the button under point and if found execute associated
+        callback
+        @param x: X coordinate of point
+        @param y: Y coordinate of point
+        @return: True if a button was found and callback executed
+        """
+        button = self.IsOverButton(x, y)
+        if button is None:
+            return False
+        
+        button.ProcessCallback()
+        return True
+    
+    def ShowButtons(self, show):
+        """
+        Set display state of buttons in Viewer
+        @param show: Display state (True if buttons must be displayed)
+        """
+        # Change display of every buttons
+        for button in self.Buttons:
+            button.Show(show)
+        
+        # Refresh button positions
+        self.RefreshButtonsPosition()
+        self.RefreshViewer()
+    
+    def RefreshButtonsPosition(self):
+        """
+        Function that refresh buttons position in Viewer
+        """
+        # Get Viewer size
+        width, height = self.GetSize()
+        
+        # Buttons are align right so we calculate buttons positions in
+        # reverse order
+        buttons = self.Buttons[:]
+        buttons.reverse()
+        
+        # Position offset on x coordinate
+        x_offset = 0
+        for button in buttons:
+            # Buttons are stacked right, removing those that are not active 
+            if button.IsEnabled():
+                # Update button position according to button width and offset
+                # on x coordinate
+                w, h = button.GetSize()
+                button.SetPosition(width - 5 - w - x_offset, 5)
+                # Update offset on x coordinate
+                x_offset += w + 2
+    
+    def DrawCommonElements(self, dc, buttons=None):
+        """
+        Function that draw common graphics for every Viewers
+        @param dc: wx.DC object corresponding to Device context where drawing
+        common graphics
+        @param buttons: List of buttons to draw if different from default
+        (default None)
+        """
+        # Get Viewer size
+        width, height = self.GetSize()
+        
+        # Set dc styling for drop before or drop after highlight
+        dc.SetPen(HIGHLIGHT_DROP_PEN)
+        dc.SetBrush(HIGHLIGHT_DROP_BRUSH)
+        
+        # Draw line at upper side of Viewer if highlight is drop before
+        if self.Highlight == HIGHLIGHT_BEFORE:
+            dc.DrawLine(0, 1, width - 1, 1)
+        
+        # Draw line at lower side of Viewer if highlight is drop before
+        elif self.Highlight == HIGHLIGHT_AFTER:
+            dc.DrawLine(0, height - 1, width - 1, height - 1)
+        
+        # If no specific buttons are defined, get default buttons
+        if buttons is None:
+            buttons = self.Buttons
+        # Draw buttons
+        for button in buttons:
+            button.Draw(dc)
+        
+        # If graph dragging is processing
+        if self.ParentWindow.IsDragging():
+            destBBox = self.ParentWindow.GetDraggingAxesClippingRegion(self)
+            srcPos = self.ParentWindow.GetDraggingAxesPosition(self)
+            if destBBox.width > 0 and destBBox.height > 0:
+                srcPanel = self.ParentWindow.DraggingAxesPanel
+                srcBBox = srcPanel.GetAxesBoundingBox()
+                
+                srcX = srcBBox.x - (srcPos.x if destBBox.x == 0 else 0)
+                srcY = srcBBox.y - (srcPos.y if destBBox.y == 0 else 0)
+                
+                srcBmp = _convert_agg_to_wx_bitmap(
+                            srcPanel.get_renderer(), None)
+                srcDC = wx.MemoryDC()
+                srcDC.SelectObject(srcBmp)
+                
+                dc.Blit(destBBox.x, destBBox.y, 
+                        int(destBBox.width), int(destBBox.height), 
+                        srcDC, srcX, srcY)
+    
+    def OnEnter(self, event):
+        """
+        Function called when entering Viewer
+        @param event: wx.MouseEvent 
+        """
+        # Display buttons
+        self.ShowButtons(True)
+        event.Skip()
+        
+    def OnLeave(self, event):
+        """
+        Function called when leaving Viewer
+        @param event: wx.MouseEvent 
+        """
+        # Check that mouse position is inside Viewer and hide buttons
+        x, y = event.GetPosition()
+        width, height = self.GetSize()
+        if not (0 < x < width - 1 and 0 < y < height - 1):
+            self.ShowButtons(False)
+        event.Skip()
+    
+    def OnCloseButton(self):
+        """
+        Function called when Close button is pressed
+        """
+        wx.CallAfter(self.ParentWindow.DeleteValue, self)
+    
+    def OnForceButton(self):
+        """
+        Function called when Force button is pressed
+        """
+        self.ForceValue(self.ItemsDict.values()[0])
+        
+    def OnReleaseButton(self):
+        """
+        Function called when Release button is pressed
+        """
+        self.ReleaseValue(self.ItemsDict.values()[0])
+    
+    def OnMouseDragging(self, x, y):
+        """
+        Function called when mouse is dragged over Viewer
+        @param x: X coordinate of mouse pointer
+        @param y: Y coordinate of mouse pointer
+        """
+        xw, yw = self.GetPosition()
+        # Refresh highlight in Debug Variable Panel (highlight can be displayed
+        # in another Viewer
+        self.ParentWindow.RefreshHighlight(x + xw, y + yw)
+    
+    def RefreshHighlight(self, x, y):
+        """
+        Function called by Debug Variable Panel asking Viewer to refresh
+        highlight according to mouse position
+        @param x: X coordinate of mouse pointer
+        @param y: Y coordinate of mouse pointer
+        """
+        # Get Viewer size
+        width, height = self.GetSize()
+        
+        # Mouse is in the first half of Viewer
+        if y < height / 2:
+            # If Viewer is the upper one, draw drop before highlight
+            if self.ParentWindow.IsViewerFirst(self):
+                self.SetHighlight(HIGHLIGHT_BEFORE)
+            
+            # Else draw drop after highlight in previous Viewer
+            else:
+                self.SetHighlight(HIGHLIGHT_NONE)
+                self.ParentWindow.HighlightPreviousViewer(self)
+        
+        # Mouse is in the second half of Viewer, draw drop after highlight 
+        else:
+            self.SetHighlight(HIGHLIGHT_AFTER)
+    
+    def OnEraseBackground(self, event):
+        """
+        Function called when Viewer background is going to be erase
+        @param event: wx.EraseEvent
+        """
+        # Prevent flicker on Windows
+        pass
+    
+    def OnResize(self, event):
+        """
+        Function called when Viewer size changed
+        @param event: wx.ResizeEvent
+        """
+        # Refresh button positions
+        self.RefreshButtonsPosition()
+        self.ParentWindow.ForceRefresh()
+        event.Skip()
+    
+    def ForceValue(self, item):
+        """
+        Force value of item given
+        @param item: Item to force value
+        """
+        # Check variable data type
+        iec_path = item.GetVariable()
+        iec_type = self.ParentWindow.GetDataType(iec_path)
+        # Return immediately if not found
+        if iec_type is None:
+            return
+        
+        # Open a dialog to enter varaible forced value
+        dialog = ForceVariableDialog(self, iec_type, str(item.GetValue()))
+        if dialog.ShowModal() == wx.ID_OK:
+            self.ParentWindow.ForceDataValue(iec_path.upper(),
+                                             dialog.GetValue())
+    
+    def ReleaseValue(self, item):
+        """
+        Release value of item given
+        @param item: Item to release value
+        """
+        self.ParentWindow.ReleaseDataValue(
+                item.GetVariable().upper())
--- a/controls/DebugVariablePanel/GraphButton.py	Thu May 30 13:23:21 2013 +0200
+++ b/controls/DebugVariablePanel/GraphButton.py	Fri May 31 00:07:21 2013 +0200
@@ -106,7 +106,7 @@
         @param enable: True if button is active in Graphic Viewer
         (default True)
         """
-        self.Enabled = True
+        self.Enabled = enable
     
     def Disable(self):
         """
@@ -143,7 +143,7 @@
         Call callback function if defined
         """
         if self.Callback is not None:
-            wx.CallAfter(self.Callback)
+            self.Callback()
     
     def Draw(self, dc):
         """