使用DrawingContext在画布上的元素上绘图

I'm drawing a selection box when I click and drag on my canvas object (which extends Canvas). I have overridden the OnRender method like so:

当我单击并拖动我的画布对象(扩展Canvas)时,我正在绘制一个选择框。我已经覆盖了OnRender方法,如下所示:

    protected override void OnRender(DrawingContext dc)
    {
        base.OnRender(dc);

        DrawGrid(dc);
        DrawSelector(dc);
    }

    private void DrawSelector(DrawingContext dc)
    {
        if (Selecting)
        {
            dc.DrawRectangle(new SolidColorBrush(Color.FromArgb(75, 0, 0, 255)), new Pen(Brushes.Blue, 1.5), SelectionRect);
        }
    }

But my selector is always drawn UNDER all the elements on the canvas. Does anyone know how I would draw my selector OVER all the UIElements on my canvas?

但是我的选择器总是在画布上的所有元素下绘制。有谁知道如何在我画布上的所有UIElements中绘制我的选择器?

Thanks.

1 个解决方案

#1

You can use an Adorner for this purpose.

您可以使用Adorner来实现此目的。