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

wxPython Users
1

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

2

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.

···

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.

--
Robin Dunn
Software Craftsman