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How can I animate the visibility of a control in UWP using visual states?

I am currently working on a custom control for my application that expands and collapses content with a title that you can click to change states. The template for it looks at the moment.

<Style TargetType="controls:ExpandControl">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="controls:ExpandControl">
                <Border>
                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="State">
                            <VisualState x:Name="Visible">
                                <VisualState.Setters>
                                    <Setter Target="Grid.Visibility" Value="Visible" />
                                </VisualState.Setters>
                            </VisualState>

                            <VisualState x:Name="Collapsed">
                                <VisualState.Setters>
                                    <Setter Target="Grid.Visibility" Value="Collapsed" />
                                </VisualState.Setters>
                            </VisualState>
                        </VisualStateGroup>
                    </VisualStateManager.VisualStateGroups>

                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>

                        <ContentPresenter x:Name="HeaderPresenter" Content="{TemplateBinding Header}" />

                        <Grid x:Name="Grid" Grid.Row="1">
                            <ContentPresenter x:Name="ContentPresenter" Content="{TemplateBinding Content}" />
                        </Grid>
                    </Grid>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

As you can see from the template, I am currently using visual states to set the visibility of the content in this control, but this is not a great user interface, as the content just disappears.

I would like to somehow manipulate the content so that the content looks as if it is being compressed and expanded from the header when the visibility of the control changes.

Storiesboards, , - , !

!

+4
1

Storyboarding Visual Studio, .

Blend, Visual Studio. , , , XSLL , .

, XAML -, , :

<VisualStateGroup x:Name="State">
    <VisualState x:Name="Visible">
        <Storyboard>
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="Grid">
                <EasingDoubleKeyFrame KeyTime="0" Value="0"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.2" Value="0"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.3" Value="1"/>
            </DoubleAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.ScaleY)" Storyboard.TargetName="Grid">
                <EasingDoubleKeyFrame KeyTime="0" Value="0"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.3" Value="1"/>
            </DoubleAnimationUsingKeyFrames>
            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="Grid">
                <DiscreteObjectKeyFrame KeyTime="0">
                    <DiscreteObjectKeyFrame.Value>
                        <Visibility>Collapsed</Visibility>
                    </DiscreteObjectKeyFrame.Value>
                </DiscreteObjectKeyFrame>
                <DiscreteObjectKeyFrame KeyTime="0:0:0.1">
                    <DiscreteObjectKeyFrame.Value>
                        <Visibility>Visible</Visibility>
                    </DiscreteObjectKeyFrame.Value>
                </DiscreteObjectKeyFrame>
            </ObjectAnimationUsingKeyFrames>
        </Storyboard>
    </VisualState>

    <VisualState x:Name="Collapsed">
        <Storyboard>
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="Grid">
                <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.1" Value="0"/>
            </DoubleAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.ScaleY)" Storyboard.TargetName="Grid">
                <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.3" Value="0"/>
            </DoubleAnimationUsingKeyFrames>
            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="Grid">
                <DiscreteObjectKeyFrame KeyTime="0">
                    <DiscreteObjectKeyFrame.Value>
                        <Visibility>Visible</Visibility>
                    </DiscreteObjectKeyFrame.Value>
                </DiscreteObjectKeyFrame>
                <DiscreteObjectKeyFrame KeyTime="0:0:0.2">
                    <DiscreteObjectKeyFrame.Value>
                        <Visibility>Collapsed</Visibility>
                    </DiscreteObjectKeyFrame.Value>
                </DiscreteObjectKeyFrame>
            </ObjectAnimationUsingKeyFrames>
        </Storyboard>
    </VisualState>
</VisualStateGroup>

Grid, :

<Grid x:Name="Grid" Grid.Row="1" RenderTransformOrigin="0.5,0">
    <Grid.RenderTransform>
        <CompositeTransform/>
    </Grid.RenderTransform>

    <ContentPresenter x:Name="ContentPresenter" Content="{TemplateBinding Content}" />
</Grid>

, Grid , .

- , , Y .

Y , RenderTransform Grid. CompositeTransform , (, , ..).

. . 0, , VisualState.Setters.

Collapsed Y 1 0. , , . , , , .

, , , Y 0 1 .

Blend. , .

Storyboarding, Blend : https://blogs.msdn.microsoft.com/avtarsohi/2016/02/16/understand-storyboard-concept-in-xaml-using-blend-2015/

+3

Source: https://habr.com/ru/post/1661343/

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