Added limited support for wxEventLoop (you can't derive from a

wx.PyEventLoop version yet...)  Updated and moved the sample showing
how to replace the MainLoop to samples/mainloop/mainloop.py.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29268 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/samples/mainloop/mainloop.py

@@ -0,0 +1,126 @@
+#!/usr/bin/env python
+
+"""
+This demo attempts to override the C++ MainLoop and implement it
+in Python.
+"""
+
+import time
+import wx                  
+
+#---------------------------------------------------------------------------
+
+class MyFrame(wx.Frame):
+
+    def __init__(self, parent, id, title):
+        wx.Frame.__init__(self, parent, id, title,
+                         (100, 100), (160, 150))
+
+        self.Bind(wx.EVT_SIZE, self.OnSize)
+        self.Bind(wx.EVT_MOVE, self.OnMove)
+        self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
+        self.Bind(wx.EVT_IDLE, self.OnIdle)
+
+        self.count = 0
+
+        panel = wx.Panel(self)
+        sizer = wx.FlexGridSizer(cols=2, hgap=5, vgap=5)
+        
+        self.sizeCtrl = wx.TextCtrl(panel, -1, "", style=wx.TE_READONLY)
+        sizer.Add(wx.StaticText(panel, -1, "Size:"))
+        sizer.Add(self.sizeCtrl)
+
+        self.posCtrl = wx.TextCtrl(panel, -1, "", style=wx.TE_READONLY)
+        sizer.Add(wx.StaticText(panel, -1, "Pos:"))
+        sizer.Add(self.posCtrl)
+
+        self.idleCtrl = wx.TextCtrl(panel, -1, "", style=wx.TE_READONLY)
+        sizer.Add(wx.StaticText(panel, -1, "Idle:"))
+        sizer.Add(self.idleCtrl)
+
+        border = wx.BoxSizer()
+        border.Add(sizer, 0, wx.ALL, 20)
+        panel.SetSizer(border)
+        
+
+    def OnCloseWindow(self, event):
+        app.keepGoing = False
+        self.Destroy()
+
+    def OnIdle(self, event):
+        self.idleCtrl.SetValue(str(self.count))
+        self.count = self.count + 1
+
+    def OnSize(self, event):
+        size = event.GetSize()
+        self.sizeCtrl.SetValue("%s, %s" % (size.width, size.height))
+        event.Skip()
+
+    def OnMove(self, event):
+        pos = event.GetPosition()
+        self.posCtrl.SetValue("%s, %s" % (pos.x, pos.y))
+
+
+
+#---------------------------------------------------------------------------
+
+class MyApp(wx.App):
+    def MainLoop(self):
+
+        if "wxMac" in wx.PlatformInfo:
+            # TODO:  Does wxMac implement wxEventLoop yet???
+            wx.App.MainLoop()
+
+        else:
+            # Create an event loop and make it active.  If you are
+            # only going to temporarily have a nested event loop then
+            # you should get a reference to the old one and set it as
+            # the active event loop when you are done with this one...
+            evtloop = wx.EventLoop()
+            old = wx.EventLoop.GetActive()
+            wx.EventLoop.SetActive(evtloop)
+
+            # This outer loop determines when to exit the application,
+            # for this example we let the main frame reset this flag
+            # when it closes.
+            while self.keepGoing:
+                # At this point in the outer loop you could do
+                # whatever you implemented your own MainLoop for.  It
+                # should be quick and non-blocking, otherwise your GUI
+                # will freeze.  
+
+                # call_your_code_here()
+
+
+                # This inner loop will process any GUI events
+                # until there are no more waiting.
+                while evtloop.Pending():
+                    evtloop.Dispatch()
+
+                # Send idle events to idle handlers.  You may want to
+                # throttle this back a bit somehow so there is not too
+                # much CPU time spent in the idle handlers.  For this
+                # example, I'll just snooze a little...
+                time.sleep(0.10)
+                self.ProcessIdle()
+
+            wx.EventLoop.SetActive(old)
+
+
+
+    def OnInit(self):
+        frame = MyFrame(None, -1, "This is a test")
+        frame.Show(True)
+        self.SetTopWindow(frame)
+
+        self.keepGoing = True
+        return True
+
+
+app = MyApp(False)
+app.MainLoop()
+
+
+
+
+