Today, I am going to give you a fast and easy tip about shadows and performance.
In a project I recently made, we told the designer not to use BitmapEffects because they are performance killers. He decided to create its own shadows by duplicating each shape and make them look like shadows (designer magic, voodoo things, etc...). I was then surprised to see that it kills performance too!
There is still the shaders effect which came with the 3.5 SP1 framework but they will be available only on Vista or greater platforms and their performance will depend on your graphic cards.
But we have another ace in our deck: the system shadow which is quite fast even on software rendering!
Using it is quite easy:
- Add the
PresentationFramework.Aero reference to your project
- Add the following XML namespace:
- Use the
SystemDropShadowChromeelement available with this namespace!
But there is a drawback: you can only produce squared shadows. However, you can still play with the
CornerRadiusproperty to create similarly round shadows.
Here is a small example of XAML code:
<ListBoxItem Content="One item" />
<ListBoxItem Content="Another item" />
<ListBoxItem Content="Another third item" />
CornerRadius="800" Width="100" Height="100">
<Ellipse Stroke="Black" Fill="White" />