private void VisualCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
var pointClicked = e.GetPosition(CanvasPanel);
if (rbAdd.IsChecked == true)
{
var visual = new DrawingVisual();
DrawSquare(visual, pointClicked, false);
CanvasPanel.AddVisual(visual);
}
else if (rbDelete.IsChecked == true)
{
var visual = GetVisual(pointClicked);
if (visual != null)
{
CanvasPanel.RemoveVisual(visual);
}
}
else if (rbSelected.IsChecked == true)
{
var visual = GetVisual(pointClicked);
if (visual != null)
{
var topLeftCorner = new Point(visual.ContentBounds.TopLeft.X + DrawingPen.Thickness / 2,
visual.ContentBounds.TopLeft.Y + DrawingPen.Thickness / 2);
DrawSquare(visual, topLeftCorner, true); // 重绘为黄色
ClickOffet = topLeftCorner - pointClicked;
IsDragging = true;
if (SelectedVisual != null && SelectedVisual != visual)
{
ClearSelection(); // 将原来为黄色的重绘为淡蓝
}
SelectedVisual = visual;
}
}
else if (rbSelectMultiple.IsChecked == true)
{
SelectionSquare = new DrawingVisual();
CanvasPanel.AddVisual(SelectionSquare);
SelectionSquareTopLeft = pointClicked;
IsMultiSelecting = true;
CanvasPanel.CaptureMouse();
}
}