public bool PreFilterMessage(ref Message m)
{
switch (m.Msg)
{
case PI.WM_MOUSELEAVE:
// Only interested in the mouse leave if it relates to the floating window and so ignore any
// message that comes from the mouse leaving the source of a drag such as a docked window or
// a workspace/navigator tab.
if (m.HWnd == FloatingWindow.Handle)
{
// If mouse has left then we need to finish with docking. Most likely reason is the focus
// has been shifted to another application with ALT+TAB.
DragEnd(Control.MousePosition);
Dispose();
}
break;
case PI.WM_KEYDOWN:
{
// Extract the keys being pressed
Keys keys = ((Keys)((int)m.WParam.ToInt64()));
// Pressing escape ends dragging
if (keys == Keys.Escape)
{
DragQuit();
Dispose();
}
return true;
}
case PI.WM_SYSKEYDOWN:
{
// Extract the keys being pressed
Keys keys = ((Keys)((int)m.WParam.ToInt64()));
// Pressing ALT+TAB ends dragging because user is moving to another app
if (PI.IsKeyDown(Keys.Tab) && ((Control.ModifierKeys & Keys.Alt) == Keys.Alt))
{
DragQuit();
Dispose();
}
break;
}
case PI.WM_MOUSEMOVE:
if (_monitorMouse)
{
// Update feedback to reflect the current mouse position
DragMove(Control.MousePosition);
}
break;
case PI.WM_LBUTTONUP:
if (_monitorMouse)
{
DragEnd(Control.MousePosition);
Dispose();
}
break;
}
return false;
}
