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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# This file is part of Beremiz, a Integrated Development Environment for

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# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.

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#

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# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

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#

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# See COPYING file for copyrights details.

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#

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# This program is free software; you can redistribute it and/or

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# modify it under the terms of the GNU General Public License

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# as published by the Free Software Foundation; either version 2

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# of the License, or (at your option) any later version.

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#

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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# GNU General Public License for more details.

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#

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# You should have received a copy of the GNU General Public License

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# along with this program; if not, write to the Free Software

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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

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import wx

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import cPickle

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MAX_ITEM_COUNT = 10

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MAX_ITEM_SHOWN = 6

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if wx.Platform == '__WXMSW__':

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    LISTBOX_BORDER_HEIGHT = 2

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    LISTBOX_INTERVAL_HEIGHT = 0

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else:

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    LISTBOX_BORDER_HEIGHT = 4

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    LISTBOX_INTERVAL_HEIGHT = 6

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class PopupWithListbox(wx.PopupWindow):

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    def __init__(self, parent, choices=[]):

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        wx.PopupWindow.__init__(self, parent, wx.BORDER_SIMPLE)

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        self.ListBox = wx.ListBox(self, -1, style=wx.LB_HSCROLL|wx.LB_SINGLE|wx.LB_SORT)

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        self.SetChoices(choices)

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        self.ListBox.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)

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        self.ListBox.Bind(wx.EVT_MOTION, self.OnMotion)

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    def SetChoices(self, choices):

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        max_text_width = 0

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        max_text_height = 0

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        self.ListBox.Clear()

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        for choice in choices:

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            self.ListBox.Append(choice)

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            w, h = self.ListBox.GetTextExtent(choice)

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            max_text_width = max(max_text_width, w)

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            max_text_height = max(max_text_height, h)

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        itemcount = min(len(choices), MAX_ITEM_SHOWN)

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        width = self.Parent.GetSize()[0]

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        height = max_text_height * itemcount + \

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                 LISTBOX_INTERVAL_HEIGHT * max(0, itemcount - 1) + \

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                 2 * LISTBOX_BORDER_HEIGHT

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        if max_text_width + 10 > width:

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            height += 15

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        size = wx.Size(width, height)

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        if wx.Platform == '__WXMSW__':

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            size.width -= 2

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        self.ListBox.SetSize(size)

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        self.SetClientSize(size)

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    def MoveSelection(self, direction):

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        selected = self.ListBox.GetSelection()

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        if selected == wx.NOT_FOUND:

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            if direction >= 0:

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                selected = 0

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            else:

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                selected = self.ListBox.GetCount() - 1

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        else:

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            selected = (selected + direction) % (self.ListBox.GetCount() + 1)

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        if selected == self.ListBox.GetCount():

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            selected = wx.NOT_FOUND

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        self.ListBox.SetSelection(selected)

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    def GetSelection(self):

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        return self.ListBox.GetStringSelection()

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    def OnLeftDown(self, event):

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        selected = self.ListBox.HitTest(wx.Point(event.GetX(), event.GetY()))

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        parent_size = self.Parent.GetSize()

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        parent_rect = wx.Rect(0, -parent_size[1], parent_size[0], parent_size[1])

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        if selected != wx.NOT_FOUND:

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            wx.CallAfter(self.Parent.SetValueFromSelected, self.ListBox.GetString(selected))

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        elif parent_rect.InsideXY(event.GetX(), event.GetY()):

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            result, x, y = self.Parent.HitTest(wx.Point(event.GetX(), event.GetY() + parent_size[1]))

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            if result != wx.TE_HT_UNKNOWN:

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                self.Parent.SetInsertionPoint(self.Parent.XYToPosition(x, y))

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        else:

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            wx.CallAfter(self.Parent.DismissListBox)

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        event.Skip()

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    def OnMotion(self, event):

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        self.ListBox.SetSelection(

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            self.ListBox.HitTest(wx.Point(event.GetX(), event.GetY())))

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        event.Skip()

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class TextCtrlAutoComplete(wx.TextCtrl):

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    def __init__ (self, parent, choices=None, dropDownClick=True,

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                  element_path=None, **therest):

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        """

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        Constructor works just like wx.TextCtrl except you can pass in a

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        list of choices.  You can also change the choice list at any time

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        by calling setChoices.

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        """

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        therest['style'] = wx.TE_PROCESS_ENTER | therest.get('style', 0)

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        wx.TextCtrl.__init__(self, parent, **therest)

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        # Some variables

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        self._dropDownClick = dropDownClick

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        self._lastinsertionpoint = None

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        self._hasfocus = False

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        self._screenheight = wx.SystemSettings.GetMetric(wx.SYS_SCREEN_Y)

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        self.element_path = element_path

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        self.listbox = None

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        self.SetChoices(choices)

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        #gp = self

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        #while ( gp != None ) :

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        #    gp.Bind ( wx.EVT_MOVE , self.onControlChanged, gp )

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        #    gp.Bind ( wx.EVT_SIZE , self.onControlChanged, gp )

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        #    gp = gp.GetParent()

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        self.Bind(wx.EVT_KILL_FOCUS, self.OnControlChanged)

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        self.Bind(wx.EVT_TEXT_ENTER, self.OnControlChanged)

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        self.Bind(wx.EVT_TEXT, self.OnEnteredText)

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        self.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)

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        # If need drop down on left click

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        if dropDownClick:

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            self.Bind(wx.EVT_LEFT_DOWN, self.OnClickToggleDown)

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            self.Bind(wx.EVT_LEFT_UP, self.OnClickToggleUp)

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    def ChangeValue(self, value):

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        wx.TextCtrl.ChangeValue(self, value)

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        self.RefreshListBoxChoices()

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    def OnEnteredText(self, event):

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        wx.CallAfter(self.RefreshListBoxChoices)

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        event.Skip()

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    def OnKeyDown(self, event):

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        """ Do some work when the user press on the keys:

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            up and down: move the cursor

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        """

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        keycode = event.GetKeyCode()

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        if keycode in [wx.WXK_DOWN, wx.WXK_UP]:

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            self.PopupListBox()

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            if keycode == wx.WXK_DOWN:

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                self.listbox.MoveSelection(1)

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            else:

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                self.listbox.MoveSelection(-1)

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        elif keycode in [wx.WXK_LEFT, wx.WXK_RIGHT, wx.WXK_RETURN] and self.listbox is not None:

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            selected = self.listbox.GetSelection()

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            if selected != "":

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                self.SetValueFromSelected(selected)

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            else:

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                event.Skip()

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        elif event.GetKeyCode() == wx.WXK_ESCAPE:

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            self.DismissListBox()

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        else:

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            event.Skip()

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    def OnClickToggleDown(self, event):

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        self._lastinsertionpoint = self.GetInsertionPoint()

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        event.Skip()

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    def OnClickToggleUp(self, event):

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        if not self._hasfocus:

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            self._hasfocus = True

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        elif self.GetInsertionPoint() == self._lastinsertionpoint:

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            wx.CallAfter(self.PopupListBox)

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        self._lastinsertionpoint = None

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        event.Skip()

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    def OnControlChanged(self, event):

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        res = self.GetValue()

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        config = wx.ConfigBase.Get()

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        listentries = cPickle.loads(str(config.Read(self.element_path, cPickle.dumps([]))))

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        if res and res not in listentries:

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            listentries = (listentries + [res])[-MAX_ITEM_COUNT:]

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            config.Write(self.element_path, cPickle.dumps(listentries))

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            config.Flush()

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            self.SetChoices(listentries)

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        self.DismissListBox()

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        self._hasfocus = False

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        event.Skip()

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    def SetChoices(self, choices):

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        self._choices = choices

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        self.RefreshListBoxChoices()

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    def GetChoices(self):

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        return self._choices

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    def SetValueFromSelected(self, selected):

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        """

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        Sets the wx.TextCtrl value from the selected wx.ListCtrl item.

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        Will do nothing if no item is selected in the wx.ListCtrl.

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        """

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        if selected != "":

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            self.SetValue(selected)

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        self.DismissListBox()

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    def RefreshListBoxChoices(self):

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        if self.listbox is not None:

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            text = self.GetValue()

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            choices = [choice for choice in self._choices if choice.startswith(text)]

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            self.listbox.SetChoices(choices)

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    def PopupListBox(self):

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        if self.listbox is None:

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            self.listbox = PopupWithListbox(self)

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            # Show the popup right below or above the button

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            # depending on available screen space...

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            pos = self.ClientToScreen((0, 0))

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            sz = self.GetSize()

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            if wx.Platform == '__WXMSW__':

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                pos.x -= 2

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                pos.y -= 2

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            self.listbox.Position(pos, (0, sz[1]))

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            self.RefreshListBoxChoices()

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            self.listbox.Show()

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    def DismissListBox(self):

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        if self.listbox is not None:

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            if self.listbox.ListBox.HasCapture():

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                self.listbox.ListBox.ReleaseMouse()

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            self.listbox.Destroy()

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            self.listbox = None