Memory Leaks with wxwindow and grid
Pekka Niiranen
krissepu at vip.fi
Wed Apr 3 14:10:04 EST 2002
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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