/// <summary>
/// Handle Mouse Move event. Here we detect whether we've exceeded the _selectionThreshold
/// and if so capture the mouse and create the visual zoom rectangle on the container object.
/// </summary>
/// <param name="sender">Mouse</param>
/// <param name="e">Mouse move information.</param>
void OnMouseMove(object sender, MouseEventArgs e)
{
if (_watching)
{
Point pos = e.GetPosition(_container);
if (new Vector(_start.X - pos.X, _start.Y - pos.Y).Length > _selectionThreshold)
{
_watching = false;
Mouse.Capture(_target, CaptureMode.SubTree);
_selectionRectVisual = new SelectionRectVisual(_start, _start, _zoom.Zoom);
_container.Children.Add(_selectionRectVisual);
}
}
if (_selectionRectVisual != null)
{
if (_selectionRectVisual.Zoom != _zoom.Zoom)
{
_selectionRectVisual.Zoom = _zoom.Zoom;
}
_selectionRectVisual.SecondPoint = e.GetPosition(_container);
}
}
/// <summary>
/// Handle the mouse left button up event. Here we actually process the selected rectangle
/// if any by first raising an event for client to receive then also zooming to that rectangle
/// if ZoomSelection is true
/// </summary>
/// <param name="sender">Mouse</param>
/// <param name="e">Mouse button information</param>
void OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
_watching = false;
if (_selectionRectVisual != null)
{
Mouse.Capture(_target, CaptureMode.None);
Point pos = e.GetPosition(_container);
double f = Math.Min(Math.Abs(pos.X - _mouseDownPoint.X), Math.Abs(pos.Y - _mouseDownPoint.Y));
Rect r = GetSelectionRect(pos);
_selectionRect = r;
if (Selected != null)
{
Selected(this, EventArgs.Empty);
}
if (_zoomSelection && f > _zoomSizeThreshold)
{
_zoom.ZoomToRect(r);
}
_container.Children.Remove(_selectionRectVisual);
_selectionRectVisual = null;
}
}