/// <summary>
/// Update the position and size of the rectangle that user is dragging out.
/// </summary>
private void SetDragZoomRect(Point pt1, Point pt2)
{
//
// Update the coordinates of the rectangle that is being dragged out by the user.
// The we offset and rescale to convert from content coordinates.
//
var rect = ViewportHelpers.Clip(pt1, pt2, new Point(0, 0),
new Point(_partDragZoomCanvas.ActualWidth, _partDragZoomCanvas.ActualHeight));
ViewportHelpers.PositionBorderOnCanvas(_partDragZoomBorder, rect);
}
/// <summary>
/// Event raised on mouse move in the ZoomAndPanControl.
/// </summary>
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (_mouseHandlingMode == MouseHandlingModeEnum.Panning)
{
var curContentPoint = e.GetPosition(_viewportCanvas);
var rectangleDragVector = curContentPoint - _origContentMouseDownPoint;
//
// When in 'dragging rectangles' mode update the position of the rectangle as the user drags it.
//
_origContentMouseDownPoint = e.GetPosition(_viewportCanvas).Clamp();
Canvas.SetLeft(_dragBorder, Canvas.GetLeft(_dragBorder) + rectangleDragVector.X);
Canvas.SetTop(_dragBorder, Canvas.GetTop(_dragBorder) + rectangleDragVector.Y);
}
else if (_mouseHandlingMode == MouseHandlingModeEnum.DragZooming)
{
var curContentPoint = e.GetPosition(_viewportCanvas);
var rect = ViewportHelpers.Clip(curContentPoint, _origContentMouseDownPoint, new Point(0, 0), new Point(_viewportCanvas.Width, _viewportCanvas.Height));
ViewportHelpers.PositionBorderOnCanvas(_sizingBorder, rect);
}
e.Handled = true;
}