ContextMenuProvider.UpdateItemStatus (Evento)
Actualización: noviembre 2007
Se produce cuando el elemento de menú está a punto de mostrarse.
Espacio de nombres: Microsoft.Windows.Design.Interaction
Ensamblado: Microsoft.Windows.Design.Extensibility (en Microsoft.Windows.Design.Extensibility.dll)
Sintaxis
Public Event UpdateItemStatus As EventHandler(Of MenuActionEventArgs)
Dim instance As ContextMenuProvider
Dim handler As EventHandler(Of MenuActionEventArgs)
AddHandler instance.UpdateItemStatus, handler
public event EventHandler<MenuActionEventArgs> UpdateItemStatus
public:
event EventHandler<MenuActionEventArgs^>^ UpdateItemStatus {
void add (EventHandler<MenuActionEventArgs^>^ value);
void remove (EventHandler<MenuActionEventArgs^>^ value);
}
JScript no admite eventos.
Ejemplos
En el ejemplo de código siguiente se muestra cómo controlar el evento UpdateItemStatus para actualizar los objetos MenuAction con valores de la selección principal. Para obtener más información, consulte Tutorial: Crear MenuAction.
' The following method handles the UpdateItemStatus event.
' It sets the MenuAction states according to the state
' of the control's Background property. This method is
' called before the context menu is shown.
Sub CustomContextMenuProvider_UpdateItemStatus( _
ByVal sender As Object, _
ByVal e As MenuActionEventArgs)
' Turn everything on, and then based on the value
' of the BackgroundProperty, selectively turn some off.
clearBackgroundMenuAction.Checked = False
clearBackgroundMenuAction.Enabled = True
setBackgroundToBlueMenuAction.Checked = False
setBackgroundToBlueMenuAction.Enabled = True
' Get a ModelItem which represents the selected control.
Dim selectedControl As ModelItem = _
e.Selection.PrimarySelection
' Get the value of the Background property from the ModelItem.
Dim backgroundProperty As ModelProperty = _
selectedControl.Properties(Control.BackgroundProperty)
' Set the MenuAction items appropriately.
If Not backgroundProperty.IsSet Then
clearBackgroundMenuAction.Checked = True
clearBackgroundMenuAction.Enabled = False
ElseIf backgroundProperty.ComputedValue.Equals(Brushes.Blue) Then
setBackgroundToBlueMenuAction.Checked = True
setBackgroundToBlueMenuAction.Enabled = False
End If
End Sub
// The following method handles the UpdateItemStatus event.
// It sets the MenuAction states according to the state
// of the control's Background property. This method is
// called before the context menu is shown.
void CustomContextMenuProvider_UpdateItemStatus(
object sender,
MenuActionEventArgs e)
{
// Turn everything on, and then based on the value
// of the BackgroundProperty, selectively turn some off.
clearBackgroundMenuAction.Checked = false;
clearBackgroundMenuAction.Enabled = true;
setBackgroundToBlueMenuAction.Checked = false;
setBackgroundToBlueMenuAction.Enabled = true;
// Get a ModelItem which represents the selected control.
ModelItem selectedControl = e.Selection.PrimarySelection;
// Get the value of the Background property from the ModelItem.
ModelProperty backgroundProperty =
selectedControl.Properties[Control.BackgroundProperty];
// Set the MenuAction items appropriately.
if (!backgroundProperty.IsSet)
{
clearBackgroundMenuAction.Checked = true;
clearBackgroundMenuAction.Enabled = false;
}
else if (backgroundProperty.ComputedValue == Brushes.Blue)
{
setBackgroundToBlueMenuAction.Checked = true;
setBackgroundToBlueMenuAction.Enabled = false;
}
}
Permisos
- Plena confianza para el llamador inmediato. Un código de confianza parcial no puede utilizar este miembro. Para obtener más información, vea Utilizar bibliotecas de código que no es de plena confianza.
Vea también
Referencia
ContextMenuProvider (Miembros)
Microsoft.Windows.Design.Interaction (Espacio de nombres)
PrimarySelectionContextMenuProvider
Otros recursos
Proveedores de características y conectores de características