I have a mouseover-selecting listview by using trigger:
<ListView.ItemContainerStyle>
<Style TargetType="{x:Type ListViewItem}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="IsSelected" Value="True" />
</Trigger>
</Style.Triggers>
</Style>
</ListView.ItemContainerStyle>
However when mouse is moved out, the trigger sets IsSelected back to false, which is not desired here. Is there a way to make a trigger only set-upon-enter but not reset-upon-exit?
This is what EventTriggers are for:
Unlike Trigger, EventTrigger has no concept of termination of state, so the action will not be undone once the condition that raised the event is no longer true.
In your case for example:
<EventTrigger RoutedEvent="MouseEnter">
<BeginStoryboard>
<Storyboard>
<BooleanAnimationUsingKeyFrames Storyboard.TargetProperty="IsSelected">
<DiscreteBooleanKeyFrame KeyTime="0" Value="True" />
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
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 want to change the grid background via binding, if a condition is true.
I am using the MVVM light framework.
<Grid.Style>
<Style TargetType="Grid">
<Style.Triggers>
<DataTrigger Binding="{Binding SuccessBooked, UpdateSourceTrigger=PropertyChanged}"
Value="True">
<!--Setter Property="Background" Value="LimeGreen" />-->
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation To="LimeGreen"
Storyboard.TargetName="ActualWeightBg"
Storyboard.TargetProperty="Background"
FillBehavior="Stop"
Duration="0:0:12"/>
<!--<DoubleAnimation Storyboard.TargetProperty="Opacity"
From="0.0" To="1.0" Duration="0:0:15"/>-->
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
<DataTrigger Binding="{Binding LowerBooked, UpdateSourceTrigger=PropertyChanged}"
Value="True">
<Setter Property="Background" Value="Red" />
</DataTrigger>
<DataTrigger Binding="{Binding HigherBooked, UpdateSourceTrigger=PropertyChanged}"
Value="True">
<Setter Property="Background" Value="DarkOrange" />
</DataTrigger>
</Style.Triggers>
</Style>
</Grid.Style>
The compiler complains:
If I remove Storyboard.TargetName="ActualWeightBg":
<ColorAnimation To="LimeGreen"
Storyboard.TargetProperty="Background"
FillBehavior="Stop"
Duration="0:0:12"/>
I get this exception:
Exception thrown: 'System.InvalidOperationException' in PresentationFramework.dll
I want that background color is going to change for 5s, after that it should change back to the standard color.
Update
So when a background color is not set, it will throw the error:
Cannot resolve all property references in the property path
'Background.Color'. Verify that applicable objects support the
properties.
As you see here, the background color is not set
then the error will occur:
But when the background is set:
Then it will work as expected.
How can I set an animated background color, without background color being set.
It is an usercontrol.
First of all, StyleTriggers in general dont support TargetNames.
AFAIK only TemplateTriggers do support them.
Your DataTrigger should look like this.
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="Background.Color" To="LimeGreen"
FillBehavior="Stop" AutoReverse="True" Duration="0:0:5" />
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
Notice the Storyboard.TargetProperty="Background.Color". Also your TimeSpan was too high. Another thing is setting the AutoReverse to true.
EDIT
To get this Trigger to work, in the Grid's Style there has an initial Background to be set.
<Style TargetType="Grid">
<Setter Property="Background" Value="Red"/>
I'm setting DataGridRow BackgroundColor to Green or to Red with trigger based on LogError value.
I want to animate newly added rows with transparency.
This works fine:
From="Transparent" To="Red"
But what I want color to goes to is current color set with Style. Its not always Red it could be Green as well.
This does not work:
From="Transparent" To="{TemplateBinding DataGridRow.Background}"
or
From="Transparent" To="{Binding RelativeSource={RelativeSource Self}, Path=Backgound}"
Code:
<DataGrid.Resources>
<Style TargetType="{x:Type DataGridRow}">
<Setter Property = "Background" Value="LimeGreen"/>
<Style.Triggers>
<DataTrigger Binding="{Binding LogMessage}" Value="Exception has occured">
<Setter Property = "Background" Value="Red"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
<DataGrid.RowStyle>
<Style TargetType="DataGridRow">
<Style.Triggers>
<EventTrigger RoutedEvent="Loaded">
<BeginStoryboard>
<Storyboard>
<ColorAnimation
Storyboard.TargetProperty="(DataGridRow.Background).(SolidColorBrush.Color)"
Duration="00:00:03"
From="Transparent"
To="{TemplateBinding DataGridRow.Background}"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
Error message: Cannot freeze this Storyboard timeline tree for use across threads.
There are few problems in your XAML code.
First, you have specified default style under resources section of DataGrid and later provide your own style which will override default style.
Either you should define new style and set its BasedOn DP to refer to default style. But in your case i don't see any use of defining separate style just for trigger.
Second, you want your animation to go from Transparent to colour selected in style which can either by LimeGreen or Red depending on trigger. So, you should not set To value in your animation since it will automatically picked up.
This will work as you desire -
<DataGrid>
<DataGrid.Resources>
<Style TargetType="{x:Type DataGridRow}">
<Setter Property ="Background" Value="LimeGreen"/>
<Style.Triggers>
<DataTrigger Binding="{Binding LogMessage}"
Value="Exception has occured">
<Setter Property = "Background" Value="Red"/>
</DataTrigger>
<EventTrigger RoutedEvent="Loaded">
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty=
"(DataGridRow.Background).(SolidColorBrush.Color)"
Duration="00:00:03"
From="Transparent"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
</DataGrid>
#Den
You have to determinate a standart Color, before you animate. This is my Style for animating a row and cell.
<Style TargetType="{x:Type DataGridRow}">
<Style.Setters>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Background" Value="Transparent"/>
</Style.Setters>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="#FFF37C21"/>
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="(DataGridRow.Background).(SolidColorBrush.Color)" Duration="00:00:0.2" To="#FFF37C21"/>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="(DataGridRow.Background).(SolidColorBrush.Color)" Duration="00:00:0.2" To="Transparent"/>
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
<Style TargetType="{x:Type DataGridCell}">
<Style.Setters>
<Setter Property="FontWeight" Value="Light"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="IsTabStop" Value="False" />
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type DataGridCell}">
<Grid x:Name="gridCell" Background="#00FFFFFF">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
<ContentPresenter
Grid.Column="1"
HorizontalAlignment="Left"
VerticalAlignment="Center"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style.Setters>
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Foreground" Value="Black"/>
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(TextElement.FontWeight)">
<DiscreteObjectKeyFrame KeyTime="00:00:0.2">
<DiscreteObjectKeyFrame.Value>
<FontWeight>Bold</FontWeight>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(TextElement.FontWeight)">
<DiscreteObjectKeyFrame KeyTime="00:00:0.2">
<DiscreteObjectKeyFrame.Value>
<FontWeight>Light</FontWeight>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
</Style.Resources>
</Style>
I've just started with WPF (I'm sorry if the question is too obvious), and I managed to put together this mouseover style. The background color animates to a darker color. I now want to also animate the text to white, so it's easier to read.
This is how I tried to add it, but it gives me the error "Cannot resolve all property references in the property path 'TextBlock.Foreground'. Verify that applicable objects support the properties" when I mouseover it.
<Border Background="#e6ebf3" CornerRadius="0,10,0,10" >
<Border.Style>
<Style TargetType="Border">
<Setter Property="Background" Value="#e6ebf3" />
<Setter Property="TextBlock.Foreground" Value="Black"/>
<Style.Triggers>
<EventTrigger RoutedEvent="UIElement.MouseEnter">
<BeginStoryboard>
<Storyboard>
<ColorAnimation Duration="0:0:0.1" Storyboard.TargetProperty="Background.Color" To="#6d809b" />
<ColorAnimation Duration="0:0:0.1" Storyboard.TargetProperty="TextBlock.Foreground" To="white" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="UIElement.MouseLeave">
<BeginStoryboard>
<Storyboard>
<ColorAnimation Duration="0:0:0.1" Storyboard.TargetProperty="Background.Color" To="#e6ebf3" />
<ColorAnimation Duration="0:0:0.1" Storyboard.TargetProperty="TextBlock.Foreground" To="Black" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
</Border.Style>........
I found an alternative way without using storyboard or animations, so I'll post it just in case. Still wondering about the original one, though.
<Border CornerRadius="0,10,0,10" >
<Border.Style>
<Style TargetType="Border">
<Setter Property="Background" Value="#e6ebf3" />
<Setter Property="TextBlock.Foreground" Value="Black"/>
<Style.Triggers>
<Trigger Property ="IsMouseOver" Value="True">
<Setter Property= "Background" Value="#6d809b"/>
<Setter Property= "TextBlock.Foreground" Value="White"/>
</Trigger>
</Style.Triggers>
</Style>
</Border.Style>
...
Indirect property targeting, that being TextBlock.Foreground is described here http://msdn.microsoft.com/en-us/library/ms742451.aspx. It's basically saying, "hey I couldn't find a property called TextBlock on type button." It works with Background.Color because the Background Property does exist on Button and it's of type ColorBrush which itself has a property of type Color.
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.