ContextMenuService Class

Definition

Namespace:

System.Windows.Controls

Assembly:

PresentationFramework.dll

Provides the system implementation for displaying a ContextMenu.

public ref class ContextMenuService abstract sealed

public static class ContextMenuService

type ContextMenuService = class

Public Class ContextMenuService

Inheritance

Object

ContextMenuService

Examples

The following example assigns the same ContextMenu to two buttons and sets the HasDropShadow, Placement, PlacementRectangle, HorizontalOffset, and VerticalOffset properties to set the ContextMenu to different positions for each button.

<StackPanel>
  <StackPanel.Resources>
    <ContextMenu x:Key="myContextMenu">
      <MenuItem Header="Item"/>
    </ContextMenu>
  </StackPanel.Resources>

  <!--Both buttons use the same ContextMenu but use the
    properties on ContextMenuService to position them
    differently.-->
  <Button ContextMenu="{StaticResource myContextMenu}" 
          ContextMenuService.HasDropShadow="False" 
          ContextMenuService.Placement="Relative"
          ContextMenuService.HorizontalOffset="50"
          ContextMenuService.VerticalOffset="-10">
    button 1
  </Button>

  <Button ContextMenu="{StaticResource myContextMenu}" 
          ContextMenuService.HasDropShadow="True"
          ContextMenuService.Placement="Right"
          ContextMenuService.PlacementRectangle="0,0,30,30">
    button 2
  </Button>
</StackPanel>

The following example shows how to use the service to display a ContextMenu on a disabled button. Notice that you set the ShowOnDisabled property on the button that is the parent of the context menu.

<Button Height="30" Content="Disabled Button" IsEnabled="False" 
     ContextMenuService.ShowOnDisabled="True">
  <Button.ContextMenu>
    <ContextMenu>
      <MenuItem Header="Item 1"/>
      <MenuItem Header="Item 2"/>
      <MenuItem Header="Item 3"/>
    </ContextMenu>
  </Button.ContextMenu>
</Button>

Remarks

The ContextMenuService class provides attached properties that can be used to specify the appearance and position of a context menu. Many of the properties in the ContextMenuService class are also defined by the ContextMenu. Sometimes it is more convenient to set the properties by using the ContextMenuService class than by setting the properties on a ContextMenu. For example, you can create a ContextMenu to be shared by multiple elements, but use the ContextMenuService class to specify a different position of the ContextMenu for each element. The following properties are defined by the ContextMenu and ContextMenuService classes. If any of these properties are set on both ContextMenu and the ContextMenuService, the property value from the ContextMenuService is used.

• Placement

• PlacementRectangle

• PlacementTargetProperty

• HorizontalOffset

• VerticalOffsetProperty

• HasDropShadow

You can also use the ContextMenuService to display menus on disabled items.

Fields

ContextMenuClosingEvent	Identifies the ContextMenuClosing routed event.
ContextMenuOpeningEvent	Identifies the ContextMenuOpening attached event.
ContextMenuProperty	Identifies the ContextMenu attached property.
HasDropShadowProperty	Identifies the HasDropShadow attached property.
HorizontalOffsetProperty	Identifies the HorizontalOffset attached property.
IsEnabledProperty	Identifies the IsEnabled attached property.
PlacementProperty	Identifies the Placement attached property.
PlacementRectangleProperty	Identifies the PlacementRectangle attached property.
PlacementTargetProperty	Identifies the PlacementTarget attached property.
ShowOnDisabledProperty	Identifies the ShowOnDisabled attached property.
VerticalOffsetProperty	Identifies the VerticalOffset attached property.

Attached Properties

ContextMenu	Gets or sets the content of a ContextMenu.
HasDropShadow	Gets or sets a value that indicates whether the ContextMenu has the drop shadow effect enabled.
HorizontalOffset	Gets or sets a value that indicates where along the x-direction to place the ContextMenu with respect to the parent control.
IsEnabled	Gets or sets a value that indicates whether the ContextMenu can be shown.
Placement	Gets or sets a value that specifies the placement of the ContextMenu relative to the PlacementTarget or PlacementRectangle.
PlacementRectangle	Gets or sets the area relative to which the context menu is positioned when it opens.
PlacementTarget	Gets or sets the parent control of the ContextMenu.
ShowOnDisabled	Gets or sets a value that indicates whether the ContextMenu should be shown when its parent is grayed out.
VerticalOffset	Gets or sets a value that indicates where along the y-direction to place the ContextMenu with respect to the parent control.

Methods

AddContextMenuClosingHandler(DependencyObject, ContextMenuEventHandler)	Adds a handler for the ContextMenuClosing attached event.
AddContextMenuOpeningHandler(DependencyObject, ContextMenuEventHandler)	Adds a handler for the ContextMenuOpening attached event.
GetContextMenu(DependencyObject)	Gets the value of the ContextMenu property of the specified object.
GetHasDropShadow(DependencyObject)	Gets a value that indicates whether the ContextMenu has a drop shadow.
GetHorizontalOffset(DependencyObject)	Gets the value of the HorizontalOffset property of the specified object.
GetIsEnabled(DependencyObject)	Gets the value of the IsEnabled property of the specified object.
GetPlacement(DependencyObject)	Gets the value of the Placement property of the specified object.
GetPlacementRectangle(DependencyObject)	Gets the value of the PlacementRectangle property of the specified object.
GetPlacementTarget(DependencyObject)	Gets the value of the PlacementTarget property of the specified object.
GetShowOnDisabled(DependencyObject)	Gets the value of the ShowOnDisabled property of the specified object.
GetVerticalOffset(DependencyObject)	Gets the value of the VerticalOffset property of the specified object.
RemoveContextMenuClosingHandler(DependencyObject, ContextMenuEventHandler)	Removes a handler for the ContextMenuClosing attached event.
RemoveContextMenuOpeningHandler(DependencyObject, ContextMenuEventHandler)	Removes a handler for the ContextMenuOpening attached event.
SetContextMenu(DependencyObject, ContextMenu)	Sets the value of the ContextMenu property of the specified object.
SetHasDropShadow(DependencyObject, Boolean)	Sets a value that indicates whether the ContextMenu has a drop shadow.
SetHorizontalOffset(DependencyObject, Double)	Sets the value of the HorizontalOffset property of the specified object.
SetIsEnabled(DependencyObject, Boolean)	Sets the value of the IsEnabled property of the specified object.
SetPlacement(DependencyObject, PlacementMode)	Sets the value of the Placement property of the specified object.
SetPlacementRectangle(DependencyObject, Rect)	Sets the value of the PlacementRectangle property of the specified object.
SetPlacementTarget(DependencyObject, UIElement)	Sets the value of the PlacementTarget property of the specified object.
SetShowOnDisabled(DependencyObject, Boolean)	Sets the value of the ShowOnDisabled property of the specified object.
SetVerticalOffset(DependencyObject, Double)	Sets the value of the VerticalOffset property of the specified object.

Attached Events

ContextMenuClosing	Occurs when the ContextMenu closes.
ContextMenuOpening	Occurs when the ContextMenu opens.

See also

• ContextMenu