I was looking at this excellent post:
How do I make an ellipse blink?
Is there a way to not have the blink fade and instead just change the color immediately with no fade?
Use DiscreteColorKeyFrame. Set the KeyTime to specify when you want it to trigger.
Here is an example of a blinking Ellipse. Fill alternates between Red and Blue every second
<Ellipse Fill="Red">
<Ellipse.Triggers>
<EventTrigger RoutedEvent="Ellipse.Loaded">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Ellipse.Fill).(SolidColorBrush.Color)"
Duration="0:0:2"
FillBehavior="HoldEnd"
RepeatBehavior="Forever">
<ColorAnimationUsingKeyFrames.KeyFrames>
<DiscreteColorKeyFrame KeyTime="0:0:0" Value="Red"/>
<DiscreteColorKeyFrame KeyTime="0:0:1" Value="Blue"/>
</ColorAnimationUsingKeyFrames.KeyFrames>
</ColorAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Ellipse.Triggers>
</Ellipse>
Related
How do I set the Background after a Storyboard ColorAnimation completes in XAML?
My ColorAnimation runs which makes Background flash red but after it returns to the original background colour (white) I would like it to remind red but i can't see how to do this.
My xaml is below - thanks
<Grid Name="cell" Background="White">
<Grid.Style>
<Style>
<Style.Triggers>
<DataTrigger Binding="{Binding DataItem.ControlValue, Converter={StaticResource IsNotNullOrEmptyConverter}}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard x:Name="Blink" >
<ColorAnimation Storyboard.TargetProperty="Background.Color" To="Red"
RepeatBehavior="3x" Duration="0:0:1" AutoReverse="True"/>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<RemoveStoryboard BeginStoryboardName="Blink" />
</DataTrigger.ExitActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Grid.Style>
Set AutoReverse to False on your ColorAnimation if you don't want it to revert back to original value i.e White.
<ColorAnimation Storyboard.TargetProperty="Background.Color" To="Red"
RepeatBehavior="3x" Duration="0:0:1" AutoReverse="False"/>
UPDATE
Add another ColorAnimation in your Storyboard which will begin after your first ColorAnimation completes may be after 4 sec interval.
<BeginStoryboard>
<Storyboard x:Name="Blink">
<ColorAnimation Storyboard.TargetProperty="Background.Color" To="Red"
RepeatBehavior="3x" Duration="0:0:1" AutoReverse="True"/>
<ColorAnimation Storyboard.TargetProperty="Background.Color" To="Red"
Duration="0:0:1" BeginTime="0:0:4"/>
</Storyboard>
</BeginStoryboard>
In my Code I have defined two Triggers, a Label and a Canvas.
The description of my problem:
When the cursor goes straight across the Label, the Style.Trigger gets activated and the background colour changes (to orange). When the cursor runs across the canvas-area the Grid.Trigger gets activated and changes the background color(to violet). So far, so good.Is the cursor now, running (after the Grid.Trigger was active) across the label-area the background does not change at all.
It seems to me that the Grid.Trigger gets priority once it was active.
<Window x:Class="Sample01.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.Resources>
<!-- Defined Style starts here -->
<Style x:Key="{x:Type Label}" TargetType="{x:Type Label}" >
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Trigger.Setters>
</Trigger.Setters>
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="DarkOrange" Duration="0:0:0.5"
Storyboard.TargetProperty="Background.Color"
/>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="White" Duration="0:0:1"
Storyboard.TargetProperty="Background.Color" />
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
<!-- End defined Style-->
</Grid.Resources>
<!-- Define Trigger -->
<Grid.Triggers>
<EventTrigger RoutedEvent="MouseEnter"
SourceName="canvas">
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="BlueViolet" Duration="0:0:1"
Storyboard.TargetProperty="Background.Color"
Storyboard.TargetName="label" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="MouseLeave"
SourceName="canvas">
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="White" Duration="0:0:1"
Storyboard.TargetProperty="Background.Color"
Storyboard.TargetName="label" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Grid.Triggers>
<Label x:Name="label" VerticalAlignment="Top" Height="100" BorderBrush="Black" BorderThickness="2" Content="LABEL"/>
<Canvas x:Name="canvas" Height="100" VerticalAlignment="Bottom"
IsHitTestVisible="True"
Background="AntiqueWhite"
/>
</Grid>
Can someone explain this behavior ?
You're running into the order of precedence of value sources for Dependency Properties. A common case of this is when you set a local value directly on an element, a value set in a style is overridden. In this case, you're applying an animation to the property, which takes precedence over anything set in the Style (or even a local value).
To allow the Style to take over again you need to make the animation no longer apply to the Label. You can do this by explicitly removing the initial animation, which will reset back to the original state, like a Property Trigger does:
<EventTrigger RoutedEvent="FrameworkElement.MouseEnter"
SourceName="canvas">
<BeginStoryboard x:Name="GridMouseover">
<Storyboard>
<ColorAnimation To="BlueViolet" Duration="0:0:1"
Storyboard.TargetProperty="Background.Color"
Storyboard.TargetName="label" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="FrameworkElement.MouseLeave"
SourceName="canvas">
<RemoveStoryboard BeginStoryboardName="GridMouseover"/>
</EventTrigger>
The disadvantage of this is that you lose the smooth animation back to White. VisualStateManager is a much better choice for this kind of thing in many cases because it handles that for you automatically.
The other thing you can do is tell the Storyboard to stop applying itself after finishing by changing the FillBehavior:
<EventTrigger RoutedEvent="FrameworkElement.MouseEnter"
SourceName="canvas">
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="BlueViolet" Duration="0:0:1"
Storyboard.TargetProperty="Background.Color"
Storyboard.TargetName="label" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="FrameworkElement.MouseLeave"
SourceName="canvas">
<BeginStoryboard>
<Storyboard FillBehavior="Stop">
<ColorAnimation To="White" Duration="0:0:1"
Storyboard.TargetProperty="Background.Color"
Storyboard.TargetName="label" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<DockPanel Name="MyPanel" IsVisibleChanged="MyPanel_IsVisibleChanged">
<DockPanel.Triggers>
<EventTrigger RoutedEvent="IsVisibleChanged"> // error here
</EventTrigger>
</DockPanel.Triggers>
</DockPanel>
Above is my dockpanel xmal code. Because IsVisibleChanged is not a RoutedEvent I can not add in the EventTrigger this code:
<Storyboard x:Key="hideMe">
<DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="0:0:2" To="0.0"/>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0:0:2" Value="{x:Static Visibility.Hidden}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="showMe">
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{x:Static Visibility.Visible}"/>
</ObjectAnimationUsingKeyFrames>
<DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="0:0:5" To="0.75"/>
</Storyboard>
I try to give a fade out animation to my dockpanel.
Instead of using an event trigger, I would use a normal trigger to check the value of the Visibility property of the DockPanel.
You can create a style on the DockPanel to do it, like this:
<DockPanel Name="MyPanel">
<DockPanel.Style>
<Style TargetType="DockPanel">
<Style.Triggers>
<Trigger Property="Visibility" Value="Visible">
<Trigger.EnterActions>
<BeginStoryboard>
<!-- Set storyboard to run when DockPanel is set visible here: -->
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<!-- Set storyboard to run when DockPanel is no longer set visible here: -->
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
</DockPanel.Style>
</DockPanel>
I want to change the background of a framework element when the DragEnter event is fired and revert its background when the DragLeave event is fired. Additionally, I want this applied in a style.
Heres what I have currently:
<EventTrigger RoutedEvent="Button.DragEnter">
<BeginStoryboard x:Name="DragHoverStoryboard">
<Storyboard>
<DoubleAnimation Storyboard.Target="??????????"
Storyboard.TargetProperty="Background"
Duration="0:0:0"
To="{DynamicResource HoverBrush}" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="Button.DragLeave">
<StopStoryboard BeginStoryboardName="DragHoverStoryboard" />
</EventTrigger>
<EventTrigger RoutedEvent="Button.Drop">
<StopStoryboard BeginStoryboardName="DragHoverStoryboard" />
</EventTrigger>
The problem here is that I can't apply target by a name because this style can be applied to any FrameworkElement. How do I apply the target to the element that the Style is attached to?
Storyboard.Target is not the problem, just leave it out. However, you need to change the rest of the animation. To animate a color, use a ColorAnimation instead of a DoubleAnimation. Also, the property "Background" does not contain a color but a brush, so animate the property "Background.Color" instead. Here is a working example:
<Style TargetType="Button">
<Setter Property="Background" Value="Red"/>
<Style.Triggers>
<EventTrigger RoutedEvent="Button.DragEnter">
<BeginStoryboard x:Name="DragHoverStoryboard">
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="Background.Color"
Duration="0:0:0" To="Green" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="Button.DragLeave">
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="Background.Color"
Duration="0:0:0" To="Red" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
Here is my XAML:
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Image x:Name="Expander_Normal"
Source="/Images/arrow-e.tiff" Width="13" Height="13" />
<ControlTemplate.Triggers>
<Trigger Property="ToggleButton.IsChecked" Value="True">
<Setter x:Name="Expander_Expanded"
TargetName="Expander_Normal" Property="Source"
Value="/Images/arrow-s.tiff" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
The transition from image to another image is very rough and I don't really like it. So how can I make the transitions smooth.
UPDATE:
Maybe instead of changing the image, maybe ROTATE the image. The main image looks like >. So maybe rotate it down (90 degrees clockwise)
If you want to go fancy, you could:
Add a story board
Use a double animation on opacity to fade out the image box
Change the image
Use another double animation to fade in the image box
UPDATE
To rotate the image:
Add a rotate transform to the image
Use a double animation on the rotate transform's angle property
See http://www.vbforums.com/showthread.php?t=555120 for an example
Try this:
<Grid>
<Image Source="Image1.png"
Height="100" Width="100">
<Image.Triggers>
<EventTrigger RoutedEvent="MouseEnter">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
BeginTime="0:0:0"
Duration="0:0:0.5"
From="1"
To="0"
Storyboard.TargetProperty="(Image.Opacity)"
/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="MouseLeave">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
BeginTime="0:0:0"
Duration="0:0:0.8"
From="0"
To="1"
Storyboard.TargetProperty="(Image.Opacity)"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Image.Triggers>
</Image>
<Image Source="Image2.png"
Height="100" Width="100" Opacity="0">
<Image.Triggers>
<EventTrigger RoutedEvent="MouseEnter">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
BeginTime="0:0:0"
Duration="0:0:0.5"
From="0"
To="1"
Storyboard.TargetProperty="(Image.Opacity)"
/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="MouseLeave">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
BeginTime="0:0:0"
Duration="0:0:0.8"
From="1"
To="0"
Storyboard.TargetProperty="(Image.Opacity)"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Image.Triggers>
</Image>
</Grid>