Habilitando o ScrollViewer HorizontalSnapPoints com coleção vinculável
Eu estou tentando criar uma experiência semelhante como no ScrollViewerSample dos exemplos de SDK do Windows 8 para ser capaz de encaixar os itens dentro de um ScrollViewer ao rolar para a esquerda e para a direita. A implementação da amostra (que funciona) é assim:
<ScrollViewer x:Name="scrollViewer" Width="480" Height="270"
HorizontalAlignment="Left" VerticalAlignment="Top"
VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Auto"
ZoomMode="Disabled" HorizontalSnapPointsType="Mandatory">
<StackPanel Orientation="Horizontal">
<Image Width="480" Height="270" AutomationProperties.Name="Image of a cliff" Source="images/cliff.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<Image Width="480" Height="270" AutomationProperties.Name="Image of Grapes" Source="images/grapes.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<Image Width="480" Height="270" AutomationProperties.Name="Image of Mount Rainier" Source="images/Rainier.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<Image Width="480" Height="270" AutomationProperties.Name="Image of a sunset" Source="images/sunset.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<Image Width="480" Height="270" AutomationProperties.Name="Image of a valley" Source="images/valley.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
</StackPanel>
</ScrollViewer>
A única diferença com a minha implementação desejada é que eu não quero um StackPanel com itens dentro, mas algo que eu possa ligar. Eu estou tentando fazer isso com um ItemsControl, mas por algum motivo o comportamento Snap não entra em ação:
<ScrollViewer x:Name="scrollViewer" Width="480" Height="270"
HorizontalAlignment="Left" VerticalAlignment="Top"
VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Auto"
ZoomMode="Disabled" HorizontalSnapPointsType="Mandatory">
<ItemsControl>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<Image Width="480" Height="270" AutomationProperties.Name="Image of a cliff" Source="images/cliff.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<Image Width="480" Height="270" AutomationProperties.Name="Image of Grapes" Source="images/grapes.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<Image Width="480" Height="270" AutomationProperties.Name="Image of Mount Rainier" Source="images/Rainier.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<Image Width="480" Height="270" AutomationProperties.Name="Image of a sunset" Source="images/sunset.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
<Image Width="480" Height="270" AutomationProperties.Name="Image of a valley" Source="images/valley.jpg" Stretch="None" HorizontalAlignment="Left" VerticalAlignment="Top"/>
</ItemsControl>
</ScrollViewer>
Sugestões seria muito apreciada!
Graças ao Denis, acabei usando o seguinte Style no ItemsControl e removi o ScrollViewer e o inline ItemsPanelTemplate por completo:
<Style x:Key="ItemsControlStyle" TargetType="ItemsControl">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ItemsControl">
<ScrollViewer Style="{StaticResource HorizontalScrollViewerStyle}" HorizontalSnapPointsType="Mandatory">
<ItemsPresenter />
</ScrollViewer>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>