/// <summary>
/// Event raised on mouse down in the ZoomAndPanControl.
/// </summary>
protected void zoomAndPanControl_MouseDown(object sender, MouseButtonEventArgs e)
{
content.Focus();
Keyboard.Focus(content);
mouseButtonDown = e.ChangedButton;
origZoomAndPanControlMouseDownPoint = e.GetPosition(ZoomAndPanControl);
origContentMouseDownPoint = e.GetPosition(content);
if ((Keyboard.Modifiers & ModifierKeys.Shift) != 0 &&
(e.ChangedButton == MouseButton.Left ||
e.ChangedButton == MouseButton.Right))
{
// Shift + left- or right-down initiates zooming mode.
mouseHandlingMode = MouseHandlingMode.Zooming;
}
else if (mouseButtonDown == MouseButton.Left)
{
// Just a plain old left-down initiates panning mode.
mouseHandlingMode = MouseHandlingMode.Panning;
}
if (mouseHandlingMode != MouseHandlingMode.None)
{
// Capture the mouse so that we eventually receive the mouse up event.
ZoomAndPanControl.CaptureMouse();
e.Handled = true;
}
}