How to get an event when the mouse is inside a window ?

[ErwinP]

Hi,

I want to make a window that gets an event when the mouse enters/leaves the window. My first approach was to catch EVT_ENTER_WINDOW and EVT_LEAVE_WINDOW. But this does not work when my window has child windows, because when the mouse enters the child window, the main window gets a EVT_LEAVE_WINDOW. In the extreme case when the child window fills the entire space of the main window, the main window gets none of the events.

Example:

import wx 

class PanelWithChild(wx.Panel):

    def __init__(self, *a, **kw): 

        wx.Panel.__init__(self, *a, **kw) 

        sizer = wx.BoxSizer(wx.VERTICAL) 

        self.SetSizer(sizer) 

        if 1:

            child = wx.Panel(self, -1)

            child.SetBackgroundColour(wx.RED)

            sizer.Add(child, 1, wx.EXPAND)

class TestFrame(wx.Frame): 

    def __init__(self): 

        wx.Frame.__init__(self, None, -1, "Test") 

        panel = PanelWithChild(self, -1) 

        panel.SetBackgroundColour(wx.BLUE)

        panel.Bind(wx.EVT_ENTER_WINDOW, self.OnEnterWindow, panel)

        panel.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeaveWindow, panel)

        

    def OnEnterWindow(self, event):     

        print "OnEnterWindow", event

        event.Skip()

        

    def OnLeaveWindow(self, event):     

        print "OnLeaveWindow", event

        event.Skip()

app = wx.PySimpleApp() 

TestFrame().Show() 

app.MainLoop()

Without the child in PanelWithChild, I get the events, but with the child I get none of them.

Is there a way to get events when the mouse enters/leaves the target window (PanelWithChild in this example) ?

Modifying the code of the target window is bad because the target window could reside in an external library that I do not want to touch.

Erwin

[Robin Dunn]

On 11/13/12 11:47 AM, ErwinP wrote:
> Without the child in PanelWithChild, I get the events, but with the
> child I get none of them.
> Is there a way to get events when the mouse enters/leaves the target
> window (PanelWithChild in this example) ?
> Modifying the code of the target window is bad because the target window
> could reside in an external library that I do not want to touch.

One way would be to poll the mouse position yourself in a timer event
using wx.GetMouseState(), and compare its position to the screen rect of
the panel, and when it transitions to/from outside/inside then you can
do what you would have done in the ENTER or LEAVE events.

--
Robin Dunn
Software Craftsman
http://wxPython.org