/// <summary>
/// Filtert eine Meldung, bevor sie gesendet wird.
/// </summary>
/// <param name="m">Die zu sendende Meldung. Diese Meldung kann nicht geändert werden.</param>
/// <returns>
/// true, um die Meldung zu filtern und das Senden zu verhindern. false, um das Senden der Meldung bis zum nächsten Filter oder Steuerelement zu ermöglichen.
/// </returns>
public bool PreFilterMessage(ref Message m)
{
Point mousePosition = Control.MousePosition;
var args = new MouseFilterEventArgs(MouseButtons.Left, 0, mousePosition.X, mousePosition.Y, 0);
switch (m.Msg)
{
case WM_MOUSEMOVE:
if (MouseFilterMove != null)
{
MouseFilterMove(Control.FromHandle(m.HWnd), args);
}
break;
case WM_LBUTTONDOWN:
if (MouseFilterDown != null)
{
MouseFilterDown(Control.FromHandle(m.HWnd), args);
}
break;
case WM_LBUTTONUP:
if (MouseFilterUp != null)
{
MouseFilterUp(Control.FromHandle(m.HWnd), args);
}
break;
}
// Always allow message to continue to the next filter control
return(args.Handled);
}
/// <summary>
/// Handles the MouseFilterDown event of the mouseFilter control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">
/// The <see cref="MouseFilterEventArgs" /> instance containing the event data.
/// </param>
private void mouseFilter_MouseFilterDown(object sender, MouseFilterEventArgs e)
{
// if(this.)
if (!_doTouchScroll && e.Button == MouseButtons.Left)
{
_mouseStartPoint = new Point(e.X, e.Y);
_panelStartPoint = new Point(-AutoScrollPosition.X,
-AutoScrollPosition.Y);
}
}
/// <summary>
/// Handles the MouseFilterUp event of the mouseFilter control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">
/// The <see cref="MouseFilterEventArgs" /> instance containing the event data.
/// </param>
private void mouseFilter_MouseFilterUp(object sender, MouseFilterEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
if (_doTouchScroll && !AutoScrollPosition.Equals(_panelStartPoint) &&
!_panelStartPoint.Equals(Point.Empty))
{
// don't fire Click-Event
e.Handled = true;
}
_doTouchScroll = false;
_mouseStartPoint = Point.Empty;
_panelStartPoint = Point.Empty;
}
}
/// <summary>
/// Handles the MouseFilterMove event of the mouseFilter control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">
/// The <see cref="MouseFilterEventArgs" /> instance containing the event data.
/// </param>
private void mouseFilter_MouseFilterMove(object sender, MouseFilterEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
if (!_mouseStartPoint.Equals(Point.Empty))
{
int dx = (e.X - _mouseStartPoint.X);
int dy = (e.Y - _mouseStartPoint.Y);
if (_doTouchScroll)
{
AutoScrollPosition = new Point(_panelStartPoint.X - dx,
_panelStartPoint.Y - dy);
}
else if (Math.Abs(dx) > 10 || Math.Abs(dy) > 10)
{
_doTouchScroll = true;
}
}
}
}