Button drag

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Hello

I try to drag a button with the mouse on a panel.

It works fine on win7 (64bits) with wxpython 4.0.6.  py3.7.3

On Ubuntu 18.04--16.04  (64bits) with wxpython 4.0.6. GTK2 py3.5 or py3.6, 
a capturelost event appears, and after my script is out of control.
Only alt+F4 can stop the script.

if I change the code like this
    def OnMouseDown(self, event):
        self.btn.CaptureMouse()
        self.btn.ReleaseMouse()
it works fine.

How to avert this event ?

Thanks for your reply.

Ph.DALET

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<div dir=3D"ltr"><div>Hello</div><div><br></div><div>I try to drag a button=
 with the mouse on a panel.</div><div><br></div><div>It works fine on win7 =
(64bits) with wxpython 4.0.6.=C2=A0 py3.7.3</div><div><br></div><div>On Ubu=
ntu 18.04--16.04=C2=A0  (64bits) with wxpython 4.0.6. GTK2  py3.5 or py3.6,=
 a capturelost event appears, and after my script is out of control.</div><=
div>Only alt+F4 can stop the script.<br></div><div><br></div><div>if I chan=
ge the code like this</div><div>=C2=A0=C2=A0=C2=A0 def OnMouseDown(self, ev=
ent):<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 self.btn.CaptureMouse()=
</div><div>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 self.btn.ReleaseMouse=
()<br></div><div></div><div></div><div>it works fine.</div><div><br></div><=
div>How to avert this event ?<br></div><div><br></div><div>Thanks for your =
reply.<br></div><div><br></div><div></div><div>Ph.DALET<br></div></div>

<p></p>

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import wx
import time

class Mywin(wx.Frame): 
    def __init__(self, parent, title): 
        super(Mywin, self).__init__(parent, title = title,size = (400,200))  
        self.InitUI()
        self.Centre() 
      
    def InitUI(self):
        self.panel = wx.Panel(self)
        vbox = wx.BoxSizer(wx.VERTICAL) 
        self.btn = wx.Button(self.panel,-1,"click Me",pos=(10, 10)) 
        vbox.Add(self.btn,0,wx.ALIGN_CENTER) 

        self.btn.Bind(wx.EVT_LEFT_DOWN, self.OnMouseDown)
        self.btn.Bind(wx.EVT_MOTION,  self.OnMouseMove)
        self.btn.Bind(wx.EVT_LEFT_UP,  self.OnMouseUp)
        self.btn.Bind(wx.EVT_MOUSE_CAPTURE_LOST, self.OnCaptureLost)
        print ("Init pos:",self.btn.GetPosition())

    def OnMouseDown(self, event):
        self.btn.CaptureMouse()
        print ("Left Down")
        sx,sy   = self.panel.ScreenToClient(self.btn.GetPosition())
        dx,dy  = self.panel.ScreenToClient(wx.GetMousePosition())
        self.btn._x,self.btn._y   = (sx-dx, sy-dy)

    def OnMouseMove(self, event):
        if event.Dragging() and event.LeftIsDown():
               x, y = wx.GetMousePosition()
               self.btn.SetPosition(wx.Point(x+self.btn._x,y+self.btn._y))
               print(self.btn.GetPosition())

    def OnMouseUp(self, event):
        if (self.btn.HasCapture()): 
                self.btn.ReleaseMouse()
        print ("Final pos:",self.btn.GetPosition())

    def OnCaptureLost(self, event):
        print ("Err")
        print(self.btn.GetCapture())



def main():
        app = wx.App()
        w = Mywin(None, title='Button drag demo')
        w.Show()
        app.MainLoop()


if __name__ == '__main__':
       main()


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