WPF: OPACITY AND THE MOUSEENTER EVENT.

Alex Leblois

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Points:471
Posted by  Alex Leblois
WPF 
WPF
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Hi 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?

  1. shreesh chandra shukla

    Post:105

    Points:735
    Re: WPF: Opacity and the MouseEnter Event.

    Hell Alex Leblois!

    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.

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