Invece di utilizzare una sottoclasse Button
, è possibile utilizzare proprietà associate o un comportamento per implementare la discesa funzionalità del pulsante, per un approccio più WPF-like e in modo da don 't impatto che il pulsante di stile:
using System.Windows.Interactivity;
public class DropDownButtonBehavior : Behavior<Button>
{
private bool isContextMenuOpen;
protected override void OnAttached()
{
base.OnAttached();
AssociatedObject.AddHandler(Button.ClickEvent, new RoutedEventHandler(AssociatedObject_Click), true);
}
void AssociatedObject_Click(object sender, System.Windows.RoutedEventArgs e)
{
Button source = sender as Button;
if (source != null && source.ContextMenu != null)
{
if (!isContextMenuOpen)
{
// Add handler to detect when the ContextMenu closes
source.ContextMenu.AddHandler(ContextMenu.ClosedEvent, new RoutedEventHandler(ContextMenu_Closed), true);
// If there is a drop-down assigned to this button, then position and display it
source.ContextMenu.PlacementTarget = source;
source.ContextMenu.Placement = PlacementMode.Bottom;
source.ContextMenu.IsOpen = true;
isContextMenuOpen = true;
}
}
}
protected override void OnDetaching()
{
base.OnDetaching();
AssociatedObject.RemoveHandler(Button.ClickEvent, new RoutedEventHandler(AssociatedObject_Click));
}
void ContextMenu_Closed(object sender, RoutedEventArgs e)
{
isContextMenuOpen = false;
var contextMenu = sender as ContextMenu;
if (contextMenu != null)
{
contextMenu.RemoveHandler(ContextMenu.ClosedEvent, new RoutedEventHandler(ContextMenu_Closed));
}
}
}
Usage:
<!-- NOTE: xmlns:i="schemas.microsoft.com/expression/2010/interactivity" -->
<Button>
<i:Interaction.Behaviors>
<local:DropDownButtonBehavior/>
</i:Interaction.Behaviors>
<Button.Content>
<StackPanel Orientation="Horizontal">
<Image Source="/DropDownButtonExample;component/Assets/add.png" SnapsToDevicePixels="True" Height="16" Width="16" />
<TextBlock Text="Add"/>
<Separator Margin="2,0">
<Separator.LayoutTransform>
<TransformGroup>
<TransformGroup.Children>
<TransformCollection>
<RotateTransform Angle="90"/>
</TransformCollection>
</TransformGroup.Children>
</TransformGroup>
</Separator.LayoutTransform>
</Separator>
<Path Margin="2" VerticalAlignment="Center" Width="6" Fill="#FF527DB5" Stretch="Uniform" HorizontalAlignment="Right" Data="F1 M 301.14,-189.041L 311.57,-189.041L 306.355,-182.942L 301.14,-189.041 Z "/>
</StackPanel>
</Button.Content>
<Button.ContextMenu>
<ContextMenu>
<MenuItem Header="Attribute"/>
<MenuItem Header="Setting"/>
<Separator/>
<MenuItem Header="Property"/>
</ContextMenu>
</Button.ContextMenu>
</Button>
attuale fonte Gist e l'esempio here.
Hai provato qualcosa? –