Color Animations in Windows Presentation Foundation

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Hello everyone,

I have the following problem : I want to create a animation on a button that changes the brush (linear gradient brush) of a button. The button is initially gray and when the mouse is over it, I want to start from the left and change the color to blue smoothly until the whole button is blue. But I don't want it to stop it here but after that to repeat the behavior but with another color randomly, to create a waterfall like effect. The problem is how to bound the To property of the Color animation to a collection of color and after each complete animation to change to the next item in the collection. And I would like to do this in XAML not programmatically.
Is there any answer to this problem?

Thanks in advance,
Tamash

Posted 28-Apr-11 5:17am

tamash_ionut

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2 solutions

Solution 2

Hi!

Seems it is exactly what you need

XML

<Button Content="Load" Width="100" Height="30" Click="Button_Click">
            <Button.Template>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Grid>
                        <Border Background="{TemplateBinding Background}">
                            <ContentControl Content="{TemplateBinding Content}"
                                            VerticalAlignment="Center"
                                            HorizontalAlignment="Center"/>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Button.Template>
            <Button.Triggers>
                <EventTrigger RoutedEvent="MouseLeave">
                    <BeginStoryboard>
                        <Storyboard Duration="0:0:3">
                            <ColorAnimation Storyboard.TargetName="stop1" Storyboard.TargetProperty="Color" To="LightGray"/>
                            <ColorAnimation Storyboard.TargetName="stop2" Storyboard.TargetProperty="Color" To="LightGray"/>
                            <ColorAnimation Storyboard.TargetName="stop3" Storyboard.TargetProperty="Color" To="LightGray"/>
                            <ColorAnimation Storyboard.TargetName="stop4" Storyboard.TargetProperty="Color" To="LightGray"/>
                            <ColorAnimation Storyboard.TargetName="stop5" Storyboard.TargetProperty="Color" To="LightGray"/>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
                <EventTrigger RoutedEvent="MouseEnter">
                    <BeginStoryboard>
                        <Storyboard Duration="0:0:3">
                            <ColorAnimation Storyboard.TargetName="stop1" Storyboard.TargetProperty="Color" To="LightBlue"/>
                            <ColorAnimation Storyboard.TargetName="stop2" Storyboard.TargetProperty="Color" To="DarkBlue"/>
                            <ColorAnimation Storyboard.TargetName="stop3" Storyboard.TargetProperty="Color" To="LightBlue"/>
                            <ColorAnimation Storyboard.TargetName="stop4" Storyboard.TargetProperty="Color" To="DarkBlue"/>
                            <ColorAnimation Storyboard.TargetName="stop5" Storyboard.TargetProperty="Color" To="LightBlue"/>
                        </Storyboard>
                    </BeginStoryboard>
                    <BeginStoryboard>
                        <Storyboard Duration="0:0:3" RepeatBehavior="Forever">
                            <DoubleAnimation  Storyboard.TargetName="stop1" Storyboard.TargetProperty="Offset" To="0"
                                              From="-1" RepeatBehavior="Forever"/>
                            <DoubleAnimation  Storyboard.TargetName="stop2" Storyboard.TargetProperty="Offset" To="0.5"
                                              From="-0.5" RepeatBehavior="Forever"/>
                            <DoubleAnimation  Storyboard.TargetName="stop3" Storyboard.TargetProperty="Offset" To="1"
                                              From="0" RepeatBehavior="Forever"/>
                            <DoubleAnimation  Storyboard.TargetName="stop4" Storyboard.TargetProperty="Offset" To="1.5"
                                              From="0.5" RepeatBehavior="Forever"/>
                            <DoubleAnimation  Storyboard.TargetName="stop5" Storyboard.TargetProperty="Offset" To="2"
                                              From="1" RepeatBehavior="Forever"/>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Button.Triggers>
            <Button.Background>
                <LinearGradientBrush>
                    <GradientStop Offset="-1" x:Name="stop1" Color="LightGray"/>
                    <GradientStop Offset="-0.5"  x:Name="stop2" Color="LightGray"/>
                    <GradientStop Offset="0" x:Name="stop3" Color="LightGray"/>
                    <GradientStop Offset="0.5" x:Name="stop4" Color="LightGray"/>
                    <GradientStop Offset="1"  x:Name="stop5" Color="LightGray"/>
                </LinearGradientBrush>
            </Button.Background>
        </Button>

Posted 28-Apr-11 19:43pm

Renat Khabibulin

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Nish Nishant · Accepted Answer · 2011-04-28T05:33:00

Solution 1

Have you looked at ColorAnimation? That's precisely meant for this.

http://msdn.microsoft.com/en-us/library/system.windows.media.animation.coloranimation.aspx[^]

Posted 28-Apr-11 5:33am

Nish Nishant