DrawingVisual.Drawing Propiedad

Definición

Espacio de nombres:

System.Windows.Media

Ensamblado:

PresentationCore.dll

Obtiene el contexto de dibujo del objeto DrawingVisual.

public:
 property System::Windows::Media::DrawingGroup ^ Drawing { System::Windows::Media::DrawingGroup ^ get(); };

public System.Windows.Media.DrawingGroup Drawing { get; }

member this.Drawing : System.Windows.Media.DrawingGroup

Public ReadOnly Property Drawing As DrawingGroup

Valor de propiedad

DrawingGroup

Obtiene un valor de tipo DrawingGroup que representa la colección de objetos Drawing de DrawingVisual.

Ejemplos

En el ejemplo siguiente, se enumera el DrawingGroup valor de cada uno de los DrawingVisual objetos visuales host.

// Enumerate the DrawingVisual children of a host visual.
public void RetrieveDrawings(Visual visualHost)
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(visualHost); i++)
    {
        // Retrieve child visual at specified index value.
        DependencyObject dependencyObject = VisualTreeHelper.GetChild(visualHost, i);

        // Determine if the child object is a DrawingVisual.
        if (dependencyObject.GetType() == typeof(DrawingVisual))
        {
            DrawingVisual drawingVisual = (DrawingVisual)dependencyObject;

            if (drawingVisual.Drawing != null)
            {
                if (drawingVisual.Drawing.GetType() == typeof(DrawingGroup))
                {
                    // Enumerate the drawings in the DrawingGroup.
                    EnumDrawingGroup(drawingVisual.Drawing);
                }
            }
        }
     }
 }

 // Enumerate the drawings in the DrawingGroup.
 public void EnumDrawingGroup(DrawingGroup drawingGroup)
 {
     DrawingCollection dc = drawingGroup.Children;

     // Enumerate the drawings in the DrawingCollection.
     foreach (Drawing drawing in dc)
     {
         // If the drawing is a DrawingGroup, call the function recursively.
         if (drawing.GetType() == typeof(DrawingGroup))
         {
             EnumDrawingGroup((DrawingGroup)drawing);
         }

         if (drawing.GetType() == typeof(GeometryDrawing))
         {
             // Perform action based on drawing type.
         }
     }
 }

' Enumerate the DrawingVisual children of a host visual.
Public Sub RetrieveDrawings(ByVal visualHost As Visual)
    For i As Integer = 0 To VisualTreeHelper.GetChildrenCount(visualHost) - 1
        ' Retrieve child visual at specified index value.
        Dim dependencyObject As DependencyObject = VisualTreeHelper.GetChild(visualHost, i)

        ' Determine if the child object is a DrawingVisual.
        If dependencyObject.GetType() Is GetType(DrawingVisual) Then
            Dim drawingVisual As DrawingVisual = CType(dependencyObject, DrawingVisual)

            If drawingVisual.Drawing IsNot Nothing Then
                If drawingVisual.Drawing.GetType() Is GetType(DrawingGroup) Then
                    ' Enumerate the drawings in the DrawingGroup.
                    EnumDrawingGroup(drawingVisual.Drawing)
                End If
            End If
        End If
    Next i
End Sub

 ' Enumerate the drawings in the DrawingGroup.
 Public Sub EnumDrawingGroup(ByVal drawingGroup As DrawingGroup)
     Dim dc As DrawingCollection = drawingGroup.Children

     ' Enumerate the drawings in the DrawingCollection.
     For Each drawing As Drawing In dc
         ' If the drawing is a DrawingGroup, call the function recursively.
         If drawing.GetType() Is GetType(DrawingGroup) Then
             EnumDrawingGroup(CType(drawing, DrawingGroup))
         End If

         If drawing.GetType() Is GetType(GeometryDrawing) Then
             ' Perform action based on drawing type.
         End If
     Next drawing
 End Sub

Comentarios

Un objeto visual almacena sus datos de representación como una lista de instrucciones de gráficos vectoriales. Cada elemento de la lista de instrucciones representa un conjunto de datos gráficos de bajo nivel en un formato serializado. Para obtener más información sobre cómo los objetos visuales almacenan datos gráficos, vea Información general sobre la representación de gráficos de WPF.

El valor devuelto no conserva ningún cambio en el DrawingVisualvalor devueltoDrawingGroup.