private void AdornerOnMouseMove(object sender, MouseEventArgs e)
{
var point = e.GetPosition(_canvas);
var newPosition = _currentToolState.OnMouseMove(point);
if (newPosition.HasValue)
{
_cropTool.Redraw(newPosition.Value.Left, newPosition.Value.Top, (int)newPosition.Value.Width, (int)newPosition.Value.Height);
}
}
private void BottomRight_DragDelta(object sender, DragDeltaEventArgs e)
{
ThumbCrop thumb = sender as ThumbCrop;
double resultThumbLeft = Canvas.GetLeft(thumb) + e.HorizontalChange;
if (resultThumbLeft > _canvas.ActualWidth)
{
resultThumbLeft = _canvas.ActualWidth;
}
double thumbResultTop = Canvas.GetTop(thumb) + e.VerticalChange;
if (thumbResultTop + _thumbSize / 2 > _canvas.ActualHeight)
{
thumbResultTop = _canvas.ActualHeight - _thumbSize / 2;
}
double resultHeight = thumbResultTop - _cropTool.TopLeftY + _thumbSize / 2;
double resultWidth = resultThumbLeft - _cropTool.TopLeftX;
if (!_KeepRatio || _Ratio == 0)
{
_cropTool.Redraw(_cropTool.TopLeftX, _cropTool.TopLeftY, resultWidth, resultHeight);
}
else
{
ResizeWithKeepRatio(_cropTool.TopLeftX, _cropTool.TopLeftY, resultWidth, resultHeight);
}
}
public CropService(FrameworkElement adornedElement)
{
_adornedElement = adornedElement;
_canvas = new Canvas
{
Height = adornedElement.ActualHeight,
Width = adornedElement.ActualWidth
};
_cropAdorner = new CropAdorner(adornedElement, _canvas);
var adornerLayer = AdornerLayer.GetAdornerLayer(adornedElement);
Debug.Assert(adornerLayer != null, nameof(adornerLayer) + " != null");
adornerLayer.Add(_cropAdorner);
_cropTool = new CropTool(_canvas);
_cropTool.CroppedAreaChangedEvent += OnCroppedAreaChanged;
_createState = new CreateState(_cropTool, _canvas);
_completeState = new CompleteState();
_dragState = new DragState(_cropTool, _canvas);
_currentToolState = _completeState;
_cropAdorner.MouseLeftButtonDown += AdornerOnMouseLeftButtonDown;
_cropAdorner.MouseMove += AdornerOnMouseMove;
_cropAdorner.MouseLeftButtonUp += AdornerOnMouseLeftButtonUp;
_cropTool.Redraw(0, 0, 0, 0);
}
public CropService(FrameworkElement adornedElement, bool squareSelection)
{
//Hack: added by thr
_squareSelection = squareSelection;
_canvas = new Canvas
{
Height = adornedElement.ActualHeight,
Width = adornedElement.ActualWidth
};
_cropAdorner = new CropAdorner(adornedElement, _canvas);
var adornerLayer = AdornerLayer.GetAdornerLayer(adornedElement);
Debug.Assert(adornerLayer != null, nameof(adornerLayer) + " != null");
adornerLayer.Add(_cropAdorner);
var cropShape = new CropShape(
new Rectangle
{
Height = 0,
Width = 0,
Stroke = Brushes.Black,
StrokeThickness = 1.5
},
new Rectangle
{
Stroke = Brushes.White,
StrokeDashArray = new DoubleCollection(new double[] { 4, 4 })
}
);
_cropTool = new CropTool(_canvas, _squareSelection);
_createState = new CreateState(_cropTool, _canvas);
_completeState = new CompleteState();
_dragState = new DragState(_cropTool, _canvas);
_currentToolState = _completeState;
_cropAdorner.MouseLeftButtonDown += AdornerOnMouseLeftButtonDown;
_cropAdorner.MouseMove += AdornerOnMouseMove;
_cropAdorner.MouseLeftButtonUp += AdornerOnMouseLeftButtonUp;
_cropTool.Redraw(0, 0, 0, 0);
}
/// <summary>
/// 重新设置裁切框位置与大小
/// </summary>
/// <param name="left">裁切框左上角位置横坐标</param>
/// <param name="top">裁切框左上角位置纵坐标</param>
/// <param name="width">裁切框宽度</param>
/// <param name="height">裁切框高度</param>
public void SetCropArea(double left, double top, double width, double height)
{
_cropTool.Redraw(left, top, width, height);
}
