/// <summary>
/// Need to update zoom values if size changes, and update ViewportZoom if too low
/// </summary>
protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
{
base.OnRenderSizeChanged(sizeInfo);
if (sizeInfo.NewSize.Width <= 1 || sizeInfo.NewSize.Height <= 1)
{
return;
}
switch (_currentZoomTypeEnum)
{
case CurrentZoomTypeEnum.Fit:
InternalViewportZoom = ViewportHelpers.FitZoom(sizeInfo.NewSize.Width, sizeInfo.NewSize.Height,
_content?.ActualWidth, _content?.ActualHeight);
break;
case CurrentZoomTypeEnum.Fill:
InternalViewportZoom = ViewportHelpers.FillZoom(sizeInfo.NewSize.Width, sizeInfo.NewSize.Height,
_content?.ActualWidth, _content?.ActualHeight);
break;
}
if (InternalViewportZoom < MinimumZoomClamped)
{
InternalViewportZoom = MinimumZoomClamped;
}
//
// INotifyPropertyChanged property update
//
OnPropertyChanged(nameof(MinimumZoomClamped));
OnPropertyChanged(nameof(FillZoomValue));
OnPropertyChanged(nameof(FitZoomValue));
}
/// <summary>
/// When the user has finished dragging out the rectangle the zoom operation is applied.
/// </summary>
private void ApplyDragZoomRect(Point finalContentMousePoint)
{
var rect = ViewportHelpers.Clip(finalContentMousePoint, _origContentMouseDownPoint, new Point(0, 0),
new Point(_partDragZoomCanvas.ActualWidth, _partDragZoomCanvas.ActualHeight));
this.AnimatedZoomTo(rect);
// new Rect(contentX, contentY, contentWidth, contentHeight));
FadeOutDragZoomRect();
}
/// <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 up in the ZoomAndPanControl.
/// </summary>
protected override void OnMouseUp(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonUp(e);
if (_mouseHandlingMode == MouseHandlingModeEnum.DragZooming)
{
var zoomAndPanControl = GetZoomAndPanControl();
var curContentPoint = e.GetPosition(_viewportCanvas);
var rect = ViewportHelpers.Clip(curContentPoint, _origContentMouseDownPoint, new Point(0, 0),
new Point(_viewportCanvas.Width, _viewportCanvas.Height));
zoomAndPanControl.AnimatedZoomTo(rect);
_dragBorder.Visibility = Visibility.Visible;
_sizingBorder.Visibility = Visibility.Hidden;
}
_mouseHandlingMode = MouseHandlingModeEnum.None;
_viewportCanvas.ReleaseMouseCapture();
e.Handled = true;
}
/// <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;
}
