Memory Leaks with wxwindow and grid
Chris Spencer
clspence at one.net
Fri Apr 5 16:40:12 EST 2002
This was discussed on the wxPython mailing list a while back. Evidently
this is "expected behaviour".
Good luck on using the grid control. I went through so many GPFs using
it that I'll *never* touch the ugly thing again.
Chris.
On Wed, 3 Apr 2002 22:10:04 +0300, "Pekka Niiranen" <krissepu at vip.fi> wrote:
>I get the following lines in dos prompt in win2000,
>when exiting the main frame:
>
>E:\koodit\python\grid>python pngrid.py
>21:39:42: There were memory leaks.
>21:39:42: ----- Memory dump -----
>21:39:42: wxEvtHandler at $1067DB8, size 48
>21:39:42:
>21:39:42:
>21:39:42: ----- Memory statistics -----
>21:39:42: 1 objects of class wxEvtHandler, total size 48
>21:39:42:
>21:39:42: Number of object items: 1
>21:39:42: Number of non-object items: 0
>21:39:42: Total allocated size: 48
>
>Note that if I comment line:
> self.pn_grid = PnGrid(self)
>
>
>no memory leaks will occur then "exit" is selected from menu !!!
>
>What am I missing here ?
>
>----------code starts here-------------------
>
>from wxPython.wx import *
>from wxPython.grid import *
>from wxPython.lib.mixins.grid import wxGridAutoEditMixin
>import sys, pprint
>ID_EXIT = 102
>
>class PnGrid(wxGrid):
> def __init__(self, parent):
> wxGrid.__init__(self, parent, -1)
>
> self.moveTo = None
>
> EVT_IDLE(self, self.OnIdle)
>
> self.CreateGrid(25, 25)
> #self.EnableEditing(false)
>
> # simple cell formatting
> self.SetColSize(3, 200)
> self.SetRowSize(4, 45)
> self.SetCellValue(0, 0, "First cell")
> self.SetCellValue(1, 1, "Another cell")
> self.SetCellValue(2, 2, "Yet another cell")
> self.SetCellValue(3, 3, "This cell is read-only")
> self.SetCellFont(0, 0, wxFont(12, wxROMAN, wxITALIC, wxNORMAL))
> self.SetCellTextColour(1, 1, wxRED)
> self.SetCellBackgroundColour(2, 2, wxCYAN)
> self.SetReadOnly(3, 3, true)
>
> self.SetCellEditor(5, 0, wxGridCellNumberEditor())
> self.SetCellValue(5, 0, "123")
> self.SetCellEditor(6, 0, wxGridCellFloatEditor())
> self.SetCellValue(6, 0, "123.34")
>
> self.SetCellValue(6, 3, "You can veto editing this cell")
>
>
> # attribute objects let you keep a set of formatting values
> # in one spot, and reuse them if needed
> attr = wxGridCellAttr()
> attr.SetTextColour(wxBLACK)
> attr.SetBackgroundColour(wxRED)
> attr.SetFont(wxFont(10, wxSWISS, wxNORMAL, wxBOLD))
>
> # you can set cell attributes for the whole row (or column)
> self.SetRowAttr(5, attr)
>
> self.SetColLabelValue(0, "Custom")
> self.SetColLabelValue(1, "column")
> self.SetColLabelValue(2, "labels")
>
> self.SetColLabelAlignment(wxALIGN_LEFT, wxALIGN_BOTTOM)
>
> # test all the events
> EVT_GRID_CELL_LEFT_CLICK(self, self.OnCellLeftClick)
> EVT_GRID_CELL_RIGHT_CLICK(self, self.OnCellRightClick)
> EVT_GRID_CELL_LEFT_DCLICK(self, self.OnCellLeftDClick)
> EVT_GRID_CELL_RIGHT_DCLICK(self, self.OnCellRightDClick)
>
> EVT_GRID_LABEL_LEFT_CLICK(self, self.OnLabelLeftClick)
> EVT_GRID_LABEL_RIGHT_CLICK(self, self.OnLabelRightClick)
> EVT_GRID_LABEL_LEFT_DCLICK(self, self.OnLabelLeftDClick)
> EVT_GRID_LABEL_RIGHT_DCLICK(self, self.OnLabelRightDClick)
>
> EVT_GRID_ROW_SIZE(self, self.OnRowSize)
> EVT_GRID_COL_SIZE(self, self.OnColSize)
>
> EVT_GRID_RANGE_SELECT(self, self.OnRangeSelect)
> EVT_GRID_CELL_CHANGE(self, self.OnCellChange)
> EVT_GRID_SELECT_CELL(self, self.OnSelectCell)
>
> EVT_GRID_EDITOR_SHOWN(self, self.OnEditorShown)
> EVT_GRID_EDITOR_HIDDEN(self, self.OnEditorHidden)
> EVT_GRID_EDITOR_CREATED(self, self.OnEditorCreated)
>
>
>
> def OnCellLeftClick(self, evt):
> pprint.pprint("OnCellLeftClick: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
> def OnCellRightClick(self, evt):
> pprint.pprint("OnCellRightClick: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
> def OnCellLeftDClick(self, evt):
> pprint.pprint("OnCellLeftDClick: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
> def OnCellRightDClick(self, evt):
> pprint.pprint("OnCellRightDClick: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
> def OnLabelLeftClick(self, evt):
> pprint.pprint("OnLabelLeftClick: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
> def OnLabelRightClick(self, evt):
> pprint.pprint("OnLabelRightClick: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
> def OnLabelLeftDClick(self, evt):
> pprint.pprint("OnLabelLeftDClick: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
> def OnLabelRightDClick(self, evt):
> pprint.pprint("OnLabelRightDClick: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
>
> def OnRowSize(self, evt):
> pprint.pprint("OnRowSize: row %d, %s\n" %
> (evt.GetRowOrCol(), evt.GetPosition()))
> evt.Skip()
>
> def OnColSize(self, evt):
> pprint.pprint("OnColSize: col %d, %s\n" %
> (evt.GetRowOrCol(), evt.GetPosition()))
> evt.Skip()
>
> def OnRangeSelect(self, evt):
> if evt.Selecting():
> pprint.pprint("OnRangeSelect: top-left %s, bottom-right %s\n" %
> (evt.GetTopLeftCoords(),
>evt.GetBottomRightCoords()))
> evt.Skip()
>
>
> def OnCellChange(self, evt):
> pprint.pprint("OnCellChange: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
>
> # Show how to stay in a cell that has bad data. We can't just
> # call SetGridCursor here since we are nested inside one so it
> # won't have any effect. Instead, set coordinants to move to in
> # idle time.
> value = self.GetCellValue(evt.GetRow(), evt.GetCol())
> if value == 'no good':
> self.moveTo = evt.GetRow(), evt.GetCol()
>
>
> def OnIdle(self, evt):
> if self.moveTo != None:
> self.SetGridCursor(self.moveTo[0], self.moveTo[1])
> self.moveTo = None
> evt.Skip()
>
>
> def OnSelectCell(self, evt):
> pprint.pprint("OnSelectCell: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
>
> # Another way to stay in a cell that has a bad value...
> row = self.GetGridCursorRow()
> col = self.GetGridCursorCol()
> if self.IsCellEditControlEnabled():
> self.HideCellEditControl()
> self.DisableCellEditControl()
> value = self.GetCellValue(row, col)
> if value == 'no good 2':
> return # cancels the cell selection
> evt.Skip()
>
>
> def OnEditorShown(self, evt):
> if evt.GetRow() == 6 and evt.GetCol() == 3 and \
> wxMessageBox("Are you sure you wish to edit this cell?",
> "Checking", wxYES_NO) == wxNO:
> evt.Veto()
> return
>
> pprint.pprint("OnEditorShown: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
>
> def OnEditorHidden(self, evt):
> if evt.GetRow() == 6 and evt.GetCol() == 3 and \
> wxMessageBox("Are you sure you wish to finish editing this
>cell?",
> "Checking", wxYES_NO) == wxNO:
> evt.Veto()
> return
>
> pprint.pprint("OnEditorHidden: (%d,%d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetPosition()))
> evt.Skip()
>
>
> def OnEditorCreated(self, evt):
> pprint.pprint("OnEditorCreated: (%d, %d) %s\n" %
> (evt.GetRow(), evt.GetCol(), evt.GetControl()))
>
>
>
>class MainFrame(wxFrame):
> """ Creates and initializes the main window"""
> def __init__(self, parent, id, title, style):
> # First, call the base class' __init__ method to create the frame
> wxFrame.__init__(self, parent, id, title, wxPoint(100, 100),
>wxSize(640, 480), style)
>
> self.CreateStatusBar()
> self.SetStatusText("This is the statusbar")
>
> # Make menu with separate MakeMenus -method
> menu = self.MakeMenus()
> self.SetMenuBar(menu)
>
> # Associate some events with methods of this class
> EVT_MENU(self, ID_EXIT, self.OnExit)
>
> # Create grid
> self.pn_grid = PnGrid(self)
>
> def MakeMenus(self):
> """Creates the menus of the main window"""
>
> # Filemenu contents
> filemenu = wxMenu()
> filemenu.Append(ID_EXIT, "Exit", "Terminate the program")
>
> # Collect all menus
> main = wxMenuBar()
> main.Append(filemenu, "File")
> return main
>
> def OnExit(self, event):
> # Close program
> self.pn_grid.Destroy()
> self.Close(true)
>
>
>class MainApp(wxApp):
> # wxWindows calls this method to initialize the application
>
> def OnInit(self):
> # Create an instance of our customized Frame class
> # Create an instance of our customized Frame class
> frame = MainFrame(NULL, -1, " PnGrid", wxSTAY_ON_TOP | wxCAPTION)
> frame.Show(true)
>
> # Tell wxWindows that this is our main window
> self.SetTopWindow(frame)
> return true
>
>if __name__ == "__main__":
> app = MainApp(0)
> app.MainLoop()
>
>
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