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WPF: Opacity and the MouseEnter Event.

Hello MindStick

c# wpf mouseevent opacity

As part of a diagram, I am drawing a few overlapping Shapes, each with Opacity=0.5, like here:

<Grid>

    <Rectangle Fill="Blue" Opacity="0.5" MouseEnter="Rectangle_MouseEnter" />
    <Rectangle Fill="Red" Opacity="0.5" />
</Grid>

private void Rectangle_MouseEnter(object sender, MouseEventArgs e)
  {
     MessageBox.Show("Entered");
  }

When the user enters the shape with the mouse, some additional information should be displayed, but the event handler never gets called.

Is there a way to get MouseEnter events for all Shapes, instead of just the topmost one?

Thanks in advance.
Last updated:7/15/2013 7:59:29 AM

1 Answers

shreesh chandra shukla
shreesh chandra shukla

Hi  lois waisbrooker !

With your layout only the topmost rectangle will raise MouseEnter event. It fully overlaps the first rectangle.

Try this code for eventHandler:

private void Rectangle_MouseEnter(object sender, MouseEventArgs e)

        {
            if (sender != grid.Children[0])
            {
                var rect = (grid.Children[0] as Rectangle);
                if (rect != null) rect.RaiseEvent(e);
            }
            else
            {
                MessageBox.Show("Entered.");
            }
        }


For this works you need to subscribe both rectangles to Rectangle_MouseEnter
 I hope it is help-full for you.

Last updated:7/15/2013 7:59:29 AM

Answer