InkCanvas.DefaultDrawingAttributes Propriedade

Definição

Namespace:

System.Windows.Controls

Assembly:

PresentationFramework.dll

Obtém ou define os atributos de desenho aplicados a novos traços de tinta feitos no InkCanvas.

public:
 property System::Windows::Ink::DrawingAttributes ^ DefaultDrawingAttributes { System::Windows::Ink::DrawingAttributes ^ get(); void set(System::Windows::Ink::DrawingAttributes ^ value); };

public System.Windows.Ink.DrawingAttributes DefaultDrawingAttributes { get; set; }

member this.DefaultDrawingAttributes : System.Windows.Ink.DrawingAttributes with get, set

Public Property DefaultDrawingAttributes As DrawingAttributes

Valor da propriedade

DrawingAttributes

Os atributos de desenho padrão para o InkCanvas.

Exemplos

O exemplo a seguir demonstra como usar dois DrawingAttributes objetos para simular a experiência de usar uma caneta e um realce no mesmo InkCanvas. O exemplo pressupõe que o elemento raiz no arquivo XAML (linguagem de marcação) é um DockPanel chamado root. Ele também pressupõe que há um Button chamado switchHighlighter e que o Click evento está conectado ao manipulador de eventos.

InkCanvas inkCanvas1 = new InkCanvas();
DrawingAttributes inkDA;
DrawingAttributes highlighterDA;
bool useHighlighter = false;

// Add an InkCanvas to the window, and allow the user to 
// switch between using a green pen and a purple highlighter 
// on the InkCanvas.
private void WindowLoaded(object sender, EventArgs e)
{
    inkCanvas1.Background = Brushes.DarkSlateBlue;
    inkCanvas1.DefaultDrawingAttributes.Color = Colors.SpringGreen;

    root.Children.Add(inkCanvas1);

    // Set up the DrawingAttributes for the pen.
    inkDA = new DrawingAttributes();
    inkDA.Color = Colors.SpringGreen;
    inkDA.Height = 5;
    inkDA.Width = 5;
    inkDA.FitToCurve = false;

    // Set up the DrawingAttributes for the highlighter.
    highlighterDA = new DrawingAttributes();
    highlighterDA.Color = Colors.Orchid;
    highlighterDA.IsHighlighter = true;
    highlighterDA.IgnorePressure = true;
    highlighterDA.StylusTip = StylusTip.Rectangle;
    highlighterDA.Height = 30;
    highlighterDA.Width = 10;

    inkCanvas1.DefaultDrawingAttributes = inkDA;
}

// Create a button called switchHighlighter and use 
// SwitchHighlighter_Click to handle the Click event.  
// The useHighlighter variable is a boolean that indicates
// whether the InkCanvas renders ink as a highlighter.

// Switch between using the 'pen' DrawingAttributes and the 
// 'highlighter' DrawingAttributes.
void SwitchHighlighter_Click(Object sender, RoutedEventArgs e)
{
    useHighlighter = !useHighlighter;
    
    if (useHighlighter)
    {
        switchHighlighter.Content = "Use Pen";
        inkCanvas1.DefaultDrawingAttributes = highlighterDA;
    }
    else
    {
        switchHighlighter.Content = "Use Highlighter";
        inkCanvas1.DefaultDrawingAttributes = inkDA;
    }
}

Private WithEvents inkCanvas1 As New InkCanvas()
Private inkDA As DrawingAttributes
Private highlighterDA As DrawingAttributes
Private useHighlighter As Boolean = False

' Add an InkCanvas to the window, and allow the user to 
' switch between using a green pen and a purple highlighter 
' on the InkCanvas.
Private Sub WindowLoaded(ByVal sender As Object, ByVal e As RoutedEventArgs)

    inkCanvas1.Background = Brushes.DarkSlateBlue
    inkCanvas1.DefaultDrawingAttributes.Color = Colors.SpringGreen

    ' Add the InkCanvas to the DockPanel, named root.
    root.Children.Add(inkCanvas1)

    ' Set up the DrawingAttributes for the pen.
    inkDA = New DrawingAttributes()
    With inkDA
        .Color = Colors.SpringGreen
        .Height = 5
        .Width = 5
        .FitToCurve = True
    End With

    ' Set up the DrawingAttributes for the highlighter.
    highlighterDA = New DrawingAttributes()
    With highlighterDA
        .Color = Colors.Orchid
        .IsHighlighter = True
        .IgnorePressure = True
        .StylusTip = StylusTip.Rectangle
        .Height = 30
        .Width = 10
    End With

    inkCanvas1.DefaultDrawingAttributes = inkDA

End Sub


' Create a button called switchHighlighter and use 
' SwitchHighlighter_Click to handle the Click event.  
' The useHighlighter variable is a boolean that indicates
' whether the InkCanvas renders ink as a highlighter.

' Switch between using the 'pen' DrawingAttributes and the 
' 'highlighter' DrawingAttributes when the user clicks on .
Private Sub SwitchHighlighter_Click(ByVal sender As [Object], ByVal e As RoutedEventArgs)

    useHighlighter = Not useHighlighter

    If useHighlighter Then
        switchHighlighter.Content = "Use Pen"
        inkCanvas1.DefaultDrawingAttributes = highlighterDA
    Else

        switchHighlighter.Content = "Use Highlighter"
        inkCanvas1.DefaultDrawingAttributes = inkDA
    End If

End Sub

O exemplo a seguir demonstra como associar a DefaultDrawingAttributes propriedade a uma fonte de dados.

<Canvas.Resources>
  <!--Define an array containing some DrawingAttributes.-->
  <x:Array x:Key="MyDrawingAttributes" x:Type="{x:Type DrawingAttributes}">
    <DrawingAttributes Color="Black" FitToCurve="true" Width="3" Height="3"/>
    <DrawingAttributes Color="Blue"  FitToCurve="false" Width="5" Height="5"/>
    <DrawingAttributes Color="Red"   FitToCurve="true" Width="7" Height="7"/>
  </x:Array>

  <!--Create a DataTemplate to display the DrawingAttributes shown above-->
  <DataTemplate DataType="{x:Type DrawingAttributes}" >
    <Border Width="80" Height="{Binding Path=Height}">
      <Border.Background >
        <SolidColorBrush Color="{Binding Path=Color}"/>
      </Border.Background>
    </Border>
  </DataTemplate>
</Canvas.Resources>

<!--Bind the InkCavas' DefaultDrawingAtributes to
    a Listbox, called lbDrawingAttributes.-->
<InkCanvas Name="inkCanvas1" Background="LightGreen" 
           Canvas.Top="400" Canvas.Left="0" 
           Height="400" Width="400"
           DefaultDrawingAttributes="{Binding 
                ElementName=lbDrawingAttributes, Path=SelectedItem}"
           >
</InkCanvas>

<!--Use the array, MyDrawingAttributes, to populate a ListBox-->
<ListBox Name="lbDrawingAttributes" 
         Canvas.Top="400" Canvas.Left="450" 
         Height="100" Width="100"
         ItemsSource="{StaticResource MyDrawingAttributes}" />

Comentários

Definir essa propriedade afetará apenas novos traços que são feitos depois que essa propriedade for definida. Para aplicar novos atributos de desenho a objetos já criados Stroke , acesse-os individualmente usando a Strokes propriedade .

Informações da propriedade de dependência

Campo Identificador	DefaultDrawingAttributesProperty
Propriedades de metadados definidas como true	Nenhum

Confira também

• Strokes