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#!/usr/bin/env python

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

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#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor

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#based on the plcopen standard. 

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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 library is free software; you can redistribute it and/or

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#modify it under the terms of the GNU General Public

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#License as published by the Free Software Foundation; either

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#version 2.1 of the License, or (at your option) any later version.

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#

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#This library 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 GNU

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#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

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

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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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import wx

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import wx.grid

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class CustomGrid(wx.grid.Grid):

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    if wx.VERSION < (2, 6, 0):

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        def Bind(self, event, function, id = None):

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            if id is not None:

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                event(self, id, function)

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            else:

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                event(self, function)

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    def __init__(self, *args, **kwargs):

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        wx.grid.Grid.__init__(self, *args, **kwargs)

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        self.Editable = True

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        if wx.VERSION >= (2, 6, 0):

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            self.Bind(wx.grid.EVT_GRID_SELECT_CELL, self.OnSelectCell)

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        else:

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            wx.grid.EVT_GRID_SELECT_CELL(self, self.OnSelectCell)

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

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    def SetDefaultValue(self, default_value):

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        self.DefaultValue = default_value

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    def SetEditable(self, editable=True):

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        self.Editable = editable

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        self.RefreshButtons()

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    def SetButtons(self, buttons):

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        for name in ["Add", "Delete", "Up", "Down"]:

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            button = buttons.get(name, None)

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            setattr(self, "%sButton" % name, button)

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            if button is not None:

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                button.Bind(wx.EVT_BUTTON, getattr(self, "On%sButton" % name))

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    def RefreshButtons(self):

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        rows = self.Table.GetNumberRows()

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        row = self.GetGridCursorRow()

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        if self.AddButton is not None:

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            self.AddButton.Enable(self.Editable)

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        if self.DeleteButton is not None:

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            self.DeleteButton.Enable(self.Editable and rows > 0)

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        if self.UpButton is not None:

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            self.UpButton.Enable(self.Editable and row > 0)

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        if self.DownButton is not None:

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            self.DownButton.Enable(self.Editable and 0 <= row < rows - 1)

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    def CloseEditControl(self):

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        self.SetGridCursor(self.GetGridCursorRow(), self.GetGridCursorCol())

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    def AddRow(self):

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        self.CloseEditControl()

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        new_row = self.GetGridCursorRow() + 1

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        col = max(self.GetGridCursorCol(), 0)

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        if getattr(self, "_AddRow", None) is not None:

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            new_row = self._AddRow(new_row)

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        else:

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            self.Table.InsertRow(new_row, self.DefaultValue.copy())

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            self.Table.ResetView(self)

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        self.SetGridCursor(new_row, col)

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        self.MakeCellVisible(new_row, col)

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        self.RefreshButtons()

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    def DeleteRow(self):

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        self.CloseEditControl()

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        row = self.GetGridCursorRow()

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        if row >= 0:

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            col = self.GetGridCursorCol()

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            if getattr(self, "_DeleteRow", None) is not None:

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                self._DeleteRow(row)

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            else:

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                self.Table.RemoveRow(row)

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                self.Table.ResetView(self)

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            new_row = min(row, self.Table.GetNumberRows() - 1)

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            self.SetGridCursor(new_row, col)

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            self.MakeCellVisible(new_row, col)

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            self.RefreshButtons()

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    def MoveRow(self, row, move):

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        self.CloseEditControl()

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        col = self.GetGridCursorCol()

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        if getattr(self, "_MoveRow", None) is not None:

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            new_row = self._MoveRow(row, move)

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        else:

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            new_row = self.Table.MoveRow(row, move)

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            if new_row != row:

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                self.Table.ResetView(self)

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        if new_row != row:

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            self.SetGridCursor(new_row, col)

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            self.MakeCellVisible(new_row, col)

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            self.RefreshButtons()

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    def OnAddButton(self, event):

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        self.AddRow()

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        self.SetFocus()

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        event.Skip()

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    def OnDeleteButton(self, event):

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        self.DeleteRow()

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        self.SetFocus()

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        event.Skip()

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    def OnUpButton(self, event):

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        self.MoveRow(self.GetGridCursorRow(), -1)

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        self.SetFocus()

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        event.Skip()

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    def OnDownButton(self, event):

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        self.MoveRow(self.GetGridCursorRow(), 1)

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        self.SetFocus()

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        event.Skip()

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    def OnSelectCell(self, event):

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        wx.CallAfter(self.RefreshButtons)

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        event.Skip()

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    def OnKeyDown(self, event):

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        key_handled = False

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        keycode = event.GetKeyCode()

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        if keycode == wx.WXK_TAB:

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            row = self.GetGridCursorRow()

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            col = self.GetGridCursorCol()

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            if event.ShiftDown():

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                if row < 0 or col == 0:

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                    self.Navigate(wx.NavigationKeyEvent.IsBackward)

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                    key_handled = True

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            elif row < 0 or col == self.Table.GetNumberCols() - 1:

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                self.Navigate(wx.NavigationKeyEvent.IsForward)

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                key_handled = True

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        elif keycode in (wx.WXK_ADD, wx.WXK_NUMPAD_ADD) and self.Editable:

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            self.AddRow()

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            key_handled = True

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        elif keycode in (wx.WXK_DELETE, wx.WXK_NUMPAD_DELETE) and self.Editable:

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            self.DeleteRow()

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            key_handled = True

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        elif keycode == wx.WXK_UP and event.ShiftDown() and self.Editable:

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            self.MoveRow(self.GetGridCursorRow(), -1)

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            key_handled = True

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        elif keycode == wx.WXK_DOWN and event.ShiftDown() and self.Editable:

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            self.MoveRow(self.GetGridCursorRow(), 1)

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            key_handled = True

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        if not key_handled:

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            event.Skip()