Customize Collapse button in UWP Grid Splitter (SfGridSplitter)

SfGridSplitter has options to collapse the element in either side of the splitter using buttons.

Enable collapse buttons

The collapse buttons can be enabled or disabled using the EnableCollapseButton property.

<input:SfGridSplitter Grid.Row="1" EnableCollapseButton="true" x:Name="gridSplitter"/>
gridSplitter.EnableCollapseButton = true;
gridSplitter.EnableCollapseButton = True

Pressing the down button

Collapse-button-options-img1

Pressing the up button

Collapse-button-options-img2

Style collapse buttons

The template collapse buttons can be customized using the properties UpButtonTemplate and DownButtonTemplate.

<input:SfGridSplitter Grid.Row="1" ShowsPreview="true"
                      EnableCollapseButton="true" x:Name="gridSplitter">

<input:SfGridSplitter.UpButtonTemplate>

<ControlTemplate TargetType="Button">

<Grid>

<VisualStateManager.VisualStateGroups>

<VisualStateGroup x:Name="CommonStates">

<VisualState x:Name="Normal"/>

<VisualState x:Name="Disabled">

<Storyboard>

<DoubleAnimation Duration="0" To="0.4" Storyboard.TargetProperty="Opacity"
                                       Storyboard.TargetName="Border"/>

<DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity"
                                     Storyboard.TargetName="FocusVisualWhite"/>

<DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity"
                                     Storyboard.TargetName="FocusVisualBlack"/>

</Storyboard>

</VisualState>

<VisualState x:Name="PointerOver">

<Storyboard>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Fill"
                               Storyboard.TargetName="Rectangle">

<DiscreteObjectKeyFrame KeyTime="0" Value="#414242"/>

</ObjectAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

<VisualState x:Name="Pressed"></VisualState>

</VisualStateGroup>

<VisualStateGroup x:Name="FocusStates">

<VisualState x:Name="Focused">

<Storyboard>

<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity"
                                     Storyboard.TargetName="FocusVisualWhite"/>

<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity"
                                     Storyboard.TargetName="FocusVisualBlack"/>

</Storyboard>

</VisualState>

<VisualState x:Name="Unfocused"/>

<VisualState x:Name="PointerFocused"/>

</VisualStateGroup>

</VisualStateManager.VisualStateGroups>

<Border x:Name="Border">

<Grid Width="22" Height="22">

<Rectangle x:Name="Rectangle" Fill="Transparent" Width="22" Height="22"/>

<Path x:Name="up" Width="13" Height="11" Stretch="Fill" Fill="White" Data="F1 M 143.011,160.869L 143.021,160.879L 143.001,160.898L 140.771,163.129L 140.771,165.325L 143.303,162.794L 144.1,161.995L 144.118,161.979L 144.906,162.764L 147.438,165.296L 147.438,163.101L 145.207,160.869L 144.108,159.773L 143.011,160.869 Z" HorizontalAlignment="Center" UseLayoutRounding="false" VerticalAlignment="Center"/>

</Grid>

</Border>

<Rectangle x:Name="FocusVisualWhite" IsHitTestVisible="false"
           Opacity="0" StrokeDashOffset="1.5" StrokeEndLineCap="Square"
		   Stroke="{StaticResource FocusVisualWhiteStrokeThemeBrush}"
		   StrokeDashArray="1,1"/>

<Rectangle x:Name="FocusVisualBlack" IsHitTestVisible="false"
           Opacity="0" StrokeDashOffset="0.5" StrokeEndLineCap="Square"
		   Stroke="{StaticResource FocusVisualBlackStrokeThemeBrush}"
		   StrokeDashArray="1,1"/>

</Grid>

</ControlTemplate>

</input:SfGridSplitter.UpButtonTemplate>

<input:SfGridSplitter.DownButtonTemplate>

<ControlTemplate TargetType="Button">

<Grid>

<VisualStateManager.VisualStateGroups>

<VisualStateGroup x:Name="CommonStates">

<VisualState x:Name="Normal"/>

<VisualState x:Name="PointerOver">

<Storyboard>

<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Fill"
                               Storyboard.TargetName="Rectangle">

<DiscreteObjectKeyFrame KeyTime="0" Value="#414242"/>

</ObjectAnimationUsingKeyFrames>

</Storyboard>

</VisualState>

<VisualState x:Name="Disabled">

<Storyboard>

<DoubleAnimation Duration="0" To="0.4" Storyboard.TargetProperty="Opacity"
                                       Storyboard.TargetName="Border"/>

<DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity"
                                     Storyboard.TargetName="FocusVisualWhite"/>

<DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity"
                                     Storyboard.TargetName="FocusVisualBlack"/>

</Storyboard>

</VisualState>

<VisualState x:Name="Pressed">

</VisualState>

</VisualStateGroup>

<VisualStateGroup x:Name="FocusStates">

<VisualState x:Name="Focused">

<Storyboard>

<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity"
                                     Storyboard.TargetName="FocusVisualWhite"/>

<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity"
                                     Storyboard.TargetName="FocusVisualBlack"/>

</Storyboard>

</VisualState>

<VisualState x:Name="Unfocused"/>

<VisualState x:Name="PointerFocused"/>

</VisualStateGroup>

</VisualStateManager.VisualStateGroups>

<Border x:Name="Border">

<Grid Width="22" Height="22">

<Rectangle x:Name="Rectangle" Fill="Transparent" Width="22" Height="22"/>

<Path x:Name="down_enabled" Width="13" Height="11" Stretch="Fill"
      Fill="White" Data="F1 M 132.911,164.227L 132.921,164.217L 132.902,164.197L 130.671,161.967L 130.671,159.773L 133.203,162.304L 134,163.101L 134.019,163.119L 134.807,162.333L 137.338,159.8L 137.338,161.995L 135.107,164.227L 134.009,165.325L 132.911,164.227 Z"
	  HorizontalAlignment="Center" VerticalAlignment="Center" />

</Grid>

</Border>

<Rectangle x:Name="FocusVisualWhite" IsHitTestVisible="false" Opacity="0"
           StrokeDashOffset="1.5" StrokeEndLineCap="Square"
		   Stroke="{StaticResource FocusVisualWhiteStrokeThemeBrush}"
		   StrokeDashArray="1,1"/>

<Rectangle x:Name="FocusVisualBlack" IsHitTestVisible="false" Opacity="0"
           StrokeDashOffset="0.5" StrokeEndLineCap="Square"
		   Stroke="{StaticResource FocusVisualBlackStrokeThemeBrush}"
		   StrokeDashArray="1,1"/>

</Grid>

</ControlTemplate>

</input:SfGridSplitter.DownButtonTemplate>

</input:SfGridSplitter>