I'd like to make a WPF UI Element appear to expand vertically when its Visibility property transitions to "Visible". I don't want to hard-code the Height in the animation since I'd like to apply this animation to any UI Element as a Style. So, I'm trying to use ScaleY but am not having any luck. Here is the XAML for the style and the listbox:
<Style x:Key="VerticalGrow" TargetType="ListBox">
<Style.Triggers>
<Trigger Property="Visibility" Value="Visible">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="TransformGroup.ScaleTransform.ScaleY" BeginTime="0:0:0.5" From="0" To="1" Duration="0:0:0.5" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
</Style.Triggers>
</Style>
<ListBox Grid.Row="2" MaxHeight="60" MinHeight="60" Visibility="{Binding MyViewModel.ListBoxVisibility}" IsSynchronizedWithCurrentItem="False" ItemsSource="{Binding MyViewModel.ListBoxItems}" Style="{DynamicResource VerticalGrow}" IsTabStop="True">
</ListBox>
I get an runtime exception complaining that:
"Cannot convert the value in attribute 'Style' to object of type 'System.Windows.Style'. Cannot resolve all property references in the property path 'TransformGroup.RenderTransform.ScaleTransform.ScaleY'. Verify that applicable objects support the properties. Error at object 'System.Windows.Controls.ListBox' in markup file 'MyApp;component/mainwindow.xaml' Line 69 Position 399."}
ListBox doesn't have a property TransformGroup. I think you want to set RenderTransform or LayoutTransform to a ScaleTransform, and then animate that.
<Style x:Key="VerticalGrow" TargetType="ListBox">
<Setter Property="RenderTransform">
<Setter.Value>
<ScaleTransform/>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="Visibility" Value="Visible">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty="RenderTransform.ScaleY"
BeginTime="0:0:0.5" From="0" To="1" Duration="0:0:0.5" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
</Style.Triggers>
</Style>
Related
I want show up a UserControl occasionally.
When the visibility of the UserControl is changed to visible, it should ease in in a moderate speed.
I figured out how to to this basically:
<UserControl.Resources>
<Style TargetType="{x:Type UserControl}" x:Key="MyStyleName">
<Style.Triggers>
<Trigger Property="Visibility" Value="Visible">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="Height" From="0.0" To="200.0" Duration="0:0:1" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
This works fine.
In the real world application, I don't know the exact value of the Height property, because the UserControl is "hosted" in a Grid and the row height is set to "Auto".
I've tried to do a Binding to the TemplatedParent, doesn't work. A Binding to a RelativeSource doesn't work either.
Can anyone help me, please?
Thanks!
As an alternative, animate a ScaleTransform in the control's RenderTransform:
<Style TargetType="UserControl">
<Setter Property="RenderTransformOrigin" Value="0.5,0.5"/>
<Setter Property="RenderTransform">
<Setter.Value>
<ScaleTransform ScaleY="0"/>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="Visibility" Value="Visible">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation To="1" Duration="0:0:1"
Storyboard.TargetProperty="RenderTransform.ScaleY"/>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
</Style.Triggers>
</Style>
I'm trying to make a "Please wait" animation. It could consist of 4 Rectangles having the exact same animation, but slightly delayed.
Here's one of them:
<Rectangle Fill="Blue" Margin="4">
<Rectangle.Style>
<Style TargetType="Rectangle">
<Setter Property="RenderTransform">
<Setter.Value>
<ScaleTransform/>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="Visibility" Value="Visible">
<Trigger.EnterActions>
<BeginStoryboard x:Name="FlipIt">
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="RenderTransform.ScaleY" From="1" To="0" Duration="0:0:1" RepeatBehavior="Forever"/>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<StopStoryboard BeginStoryboardName="FlipIt"/>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
</Rectangle.Style>
</Rectangle>
(I used a trigger on Visibility so it doesn't eat up CPU uselessly)
So basically, what I could do is to simply copy paste these 24 lines of XAML Style for each of my Rectangles. But what if I decided that 9 rectangles look better? That's gonna get nuts pretty fast.
My idea was to have, in my Window's Resources, this style, and in each Rectangle's Resources, a DoubleAnimation for whatever it wants to do (in the case of 9 Rectangles, I may want the middle one to spin instead of scale on its Y axis).
The question is then: how can I reference a Rectangle's DoubleAnimation (given the fact that they'd all have the same x:Key) inside my Style's Storyboard (contained in my Window's Resources)?
Edit 1:
Here's how I think it should go:
Window's resources:
A style named "AnimIt"...
<Style.Triggers>
<Trigger Property="Visibility" Value="Visible">
<Trigger.EnterActions>
<BeginStoryboard x:Name="FlipIt">
<Storyboard Children="?????????????"/>
</BeginStoryboard>
</Trigger.EnterActions>
...
A Rectangle:
<Rectangle Style="{StaticResource AnimIt}">
<Rectangle.Resources>
<DoubleAnimation x:Key="anim" Storyboard.TargetProperty="RenderTransform.ScaleY" From="1" To="0" Duration="0:0:1" RepeatBehavior="Forever"/>
</Rectangle.Resources>
I dont really know what to put in place of the "????????". I tried playing with RelativeSource FindAncestor, but have no idea how to reference the DoubleAnimation there.
I want to rotate the ellipse when ProgressBar is set to true in DataTrigger. But It isn't work.
I test the ellipse is work OK with Opacity. But it isn't work with RotateTransform. And the ellipse is also work with EventTrigger.
Which is my mistake and how I fix it.
Thanks for reading my issue.
<Ellipse Name="ProgressEllipse" Width="40" Height="40" StrokeThickness="7" Stroke="{StaticResource ProcessEllipseGradient}" Margin="5,0,0,0">
<Ellipse.RenderTransform>
<RotateTransform CenterX="20" CenterY="20" Angle="0"/>
</Ellipse.RenderTransform>
<!--<Ellipse.Triggers>
<EventTrigger RoutedEvent="Ellipse.Loaded" SourceName="ProgressEllipse">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="ProgressEllipse"
Storyboard.TargetProperty="(Ellipse.RenderTransform).(RotateTransform.Angle)"
From="0"
To="360"
Duration="0:0:1"
RepeatBehavior="Forever" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Ellipse.Triggers>-->
<Ellipse.Style>
<Style TargetType="{x:Type Ellipse}">
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=ProgressBar}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty="(Ellipse.RenderTransform).(RotateTransform.Angle)"
From="0"
To="1"
Duration="0:0:5"
RepeatBehavior="Forever"/>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Ellipse.Style>
</Ellipse>
Addition information
Sorry WPF-it. I make my question not clear.
The Ellipse is work OK when It located in form directly. But It not work when located in a Template.
Follow is my code.
https://www.mediafire.com/?7rb8gvthx94rfiy
If I omit "RelativeSource={RelativeSource self}" in the Trigger. It will throw exception(Cannot animate '(0).(1)' on an immutable object instance)
In the sample code. I have three ellipse. The left ellipse is not work when I locate it in the template(I try to make it work, but It don't work). The center ellipse is the same code with the ellipse in template. But It work OK when I locate it directly in the form. And I test ellipse with Opacity property in the template. And It work OK. I don't know which is my mistake.
Can you give me a hand.
Thanks for reading my question
Ellipse.ProgressBar property does not exist in WPF. Your are probably referring some property from the underlying DataContext of Ellipse.
So change Binding="{Binding RelativeSource={RelativeSource Self}, Path=ProgressBar}" to simply Binding="{Binding Path=ProgressBar}"
Also make sure that this ProgressBar property generates property change notifications so that trigger will execute the action ...
Plus you should also have an EndStoryBoard also.
<Ellipse.Style>
<Style TargetType="{x:Type Ellipse}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=ProgressBar}"
Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Name="MyStoryboard">
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty="(Ellipse.RenderTransform).(RotateTransform.Angle)"
From="0"
To="1"
Duration="0:0:5"
RepeatBehavior="Forever"/>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<StopStoryboard BeginStoryboardName="MyStoryboard"/>
</DataTrigger.ExitActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Ellipse.Style>
I have the following XAML:
<UserControl.Resources>
<SolidColorBrush x:Key="Brush"></SolidColorBrush>
<Style TargetType="{x:Type StackPanel}" x:Key="ColourChangingStyle">
<Setter Property="Background" Value="{StaticResource Brush}" />
<Style.Triggers>
<DataTrigger Binding="{Binding Path='Stage'}" Value="1">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.Target="{StaticResource Brush}"
Storyboard.TargetProperty="Color" From="{StaticResource FirstColor}" To="{StaticResource FinishedColor}" Duration="0:0:10" BeginTime="0:0:0"/>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
<StackPanel x:Name="InfoPanel" Orientation="Vertical" Margin="1,2" Style="{DynamicResource ColourChangingStyle}">
...
</StackPanel>
And I keep getting the same error that:
Cannot animate 'Color' on an immutable object instance
which is the brush. I looked up the problem, and believe that it's something to do with the binding the brush to the StackPanel making it unavailable to alter later.
Is there any way around this, I literally have no clue what my other options for the same effect are without hardcoding colors in, and doing all the events in code.
It seems that you can not animate a Brush in Resources with Storyboard.Target. But you can set the Background of your Style (you have done this already) and animate this property.
<ColorAnimation Storyboard.TargetProperty="Background.Color"
From="{StaticResource FirstColor}"
To="{StaticResource FinishedColor}"
Duration="0:0:10" BeginTime="0:0:0" />
I'm developing an XBAP and i have a simple requirement.
The DataContext of the whole main page is set to an instance of my UserViewModel. The UserViewModel has a DependencyProperty called AuthenticationState which is an enum with values like 'Authenticated','NotAutheticated' and 'AuthenticationFailed'.
Now, i need to respond to any change in this value by hiding/displaying various elements on the page.
What (and where) is the best way of doing that?
As you mentioned you can't use a DataTrigger directly on a control. A work around would be to use a style on each Control that needs to be hidden.
<Grid>
<Rectangle Fill="Red" />
<Grid.Style>
<Style TargetType="Grid">
<Style.Triggers>
<DataTrigger Binding="{Binding Test}" Value="true">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</Grid.Style>
</Grid>
A preferable method would be to use a Converter called "AuthenticationStateToVisibilityConverter" that is used in binding the control's Visibility property to the data context's AuthenticationState property.
The best way would be to use a DataTrigger. So something like this:
<Window.Triggers>
<DataTrigger Binding="{Binding AuthenticationState}" Value="NotAuthenticated">
<Setter TargetName="nameOfControl" Property="Visibility" Value="Collapsed" />
</DataTrigger>
...
<TextBox x:Name="nameOfControl" />
</Window.Triggers>
As long as you UserViewModel object is in the DataContext of the Window then this should work!
Managed to sort it using styles. It's a pain but it works!
The full source is below.
<Grid x:Name="contentGrid" Grid.Row="1">
<!--login-->
<controls:LoginControl>
<controls:LoginControl.Style>
<Style>
<Setter Property="Control.Opacity" Value="0"/>
<Setter Property="Control.IsHitTestVisible" Value="False"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Source={StaticResource UserViewModel},Path=UserAuthenticationState}"
Value="{x:Static model:AuthenticationState.NotAuthenticated}">
<Setter Property="Control.IsHitTestVisible" Value="True"/>
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation To="1" Duration="0:0:2"
Storyboard.TargetProperty="Opacity"></DoubleAnimation>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation To="0" Duration="0:0:2"
Storyboard.TargetProperty="Opacity"></DoubleAnimation>
</Storyboard>
</BeginStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
</Style.Triggers>
</Style>
</controls:LoginControl.Style>
</controls:LoginControl>
<!--slider-->
<slider:PageSlider>
<Button>1</Button>
<Button>2</Button>
<Button>3</Button>
<slider:PageSlider.Style>
<Style>
<Setter Property="Control.Opacity" Value="0"/>
<Setter Property="Control.IsHitTestVisible" Value="False"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Source={StaticResource UserViewModel},Path=UserAuthenticationState}"
Value="{x:Static model:AuthenticationState.Authenticated}">
<Setter Property="Control.IsHitTestVisible" Value="True"/>
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation To="1" Duration="0:0:2"
Storyboard.TargetProperty="Opacity"></DoubleAnimation>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation To="0" Duration="0:0:2"
Storyboard.TargetProperty="Opacity"></DoubleAnimation>
</Storyboard>
</BeginStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
</Style.Triggers>
</Style>
</slider:PageSlider.Style>
</slider:PageSlider>
</Grid>
Actually, the best way to do this is to expose the appropriate properties from your view model. This makes your logic more centralized and easier to test. Also, it performs better than converters. It is, after all, a view model. Therefore, it should model the view. If the view needs a property to tell it when to hide / show a panel, add such a property to your view model.