public CroppingAdorner(UIElement adornedElement) : base(adornedElement)
{
_visualCollection = new VisualCollection(this);
_originalCanvas = (Canvas)adornedElement;
_canvasOverlay = new Canvas();
_rectangleManager = new RectangleManager(_canvasOverlay);
_overlayManager = new OverlayManager(_canvasOverlay, _rectangleManager);
_thumbManager = new ThumbManager(_canvasOverlay, _rectangleManager);
_displayTextManager = new DisplayTextManager(_canvasOverlay, _rectangleManager);
_visualCollection.Add(_canvasOverlay);
//add event handlers
MouseLeftButtonDown += MouseLeftButtonDownEventHandler;
MouseMove += MouseMoveEventHandler;
MouseLeftButtonUp += MouseLeftButtonUpEventHandler;
Loaded += (object sender, RoutedEventArgs args) => Show();
_originalCanvas.SizeChanged += (object sender, SizeChangedEventArgs e) => Show();
_rectangleManager.RectangleSizeChanged += (object sender, EventArgs args) => Show();
_rectangleManager.OnRectangleDoubleClickEvent += (object sender, EventArgs args) =>
{
OnRectangleDoubleClickEvent?.Invoke(sender, new DoubleClickEventArgs()
{
BitmapFrame = GetCroppedBitmapFrame()
});
};
}
public CroppingAdorner(UIElement adornedElement) : base(adornedElement)
{
_visualCollection = new VisualCollection(this);
_canvasOverlay = new Canvas();
_rectangleManager = new RectangleManager(_canvasOverlay);
_overlayManager = new OverlayManager(_canvasOverlay, _rectangleManager);
_thumbManager = new ThumbManager(_canvasOverlay, _rectangleManager);
_displayTextManager = new DisplayTextManager(_canvasOverlay, _rectangleManager);
_visualCollection.Add(_canvasOverlay);
MouseLeftButtonDown += MouseLeftButtonDownEventHandler;
MouseMove += MouseMoveEventHandler;
MouseLeftButtonUp += MouseLeftButtonUpEventHandler;
//add overlay
Loaded += (sender, args) => { _overlayManager.UpdateOverlay(); };
//if rectangle size changed, re-draw overlay
_rectangleManager.RectangleSizeChanged += (sender, args) =>
{
_overlayManager.UpdateOverlay();
_displayTextManager.UpdateSizeText();
};
_rectangleManager.OnRectangleDoubleClickEvent += (sender, args) => OnRectangleDoubleClickEvent?.Invoke(sender, new DoubleClickEventArgs {
BitmapFrame = GetCroppedBitmapFrame()
});
}
/// <summary>
/// Event handler for mouse left button
/// </summary>
/// <param name="e">Mouse event args</param>
public void MouseLeftButtonDownEventHandler(MouseButtonEventArgs e)
{
_canvas.CaptureMouse();
//get mouse click point relative to canvas overlay
Point mouseClickPoint = e.GetPosition(_canvas);
//first, we need to know where we click
TouchPoint touch = GetTouchPoint(mouseClickPoint);
//if we click outside of rectangle and rectangle already exist,
//start recreating
if ((Math.Abs(_rectangle.Height) > Tolerance ||
Math.Abs(_rectangle.Width) > Tolerance) &&
touch == TouchPoint.OutsideRectangle)
{
//reset existing rectangle
UpdateRectangle(0,
0,
0,
0);
//start drawing
_isDrawing = true;
}
//if rectangle not created - start creating
if (Math.Abs(_rectangle.Height) < Tolerance &&
Math.Abs(_rectangle.Width) < Tolerance)
{
_mouseStartPoint = mouseClickPoint;
_isDrawing = true;
}
//if rectangle is created and we click inside rectangle - start dragging
if (Math.Abs(_rectangle.Height) > Tolerance &&
Math.Abs(_rectangle.Width) > Tolerance &&
touch != TouchPoint.OutsideRectangle)
{
if (e.ClickCount == 2)
{
OnRectangleDoubleClickEvent?.Invoke(this,
EventArgs.Empty);
return;
}
_isDragging = true;
_mouseLastPoint = mouseClickPoint;
}
}