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Guide pratique pour créer et utiliser un canevas

  • Article

Cet exemple montre comment créer et utiliser une instance de Canvas.

Exemple

L’exemple suivant positionne explicitement deux éléments TextBlock à l’aide des méthodes SetTop et SetLeft de Canvas. L’exemple affecte également une couleur de Background de LightSteelBlue au Canvas.

Note

Lorsque vous utilisez xaml (Extensible Application Markup Language) pour positionner TextBlock éléments, utilisez les propriétés Top et Left.

    private void CreateAndShowMainWindow()
    {
        // Create the application's main window
        mainWindow = new Window();

        // Create a canvas sized to fill the window
        Canvas myCanvas = new Canvas();
        myCanvas.Background = Brushes.LightSteelBlue;

        // Add a "Hello World!" text element to the Canvas
        TextBlock txt1 = new TextBlock();
        txt1.FontSize = 14;
        txt1.Text = "Hello World!";
        Canvas.SetTop(txt1, 100);
        Canvas.SetLeft(txt1, 10);
        myCanvas.Children.Add(txt1);

        // Add a second text element to show how absolute positioning works in a Canvas
        TextBlock txt2 = new TextBlock();
        txt2.FontSize = 22;
        txt2.Text = "Isn't absolute positioning handy?";
        Canvas.SetTop(txt2, 200);
        Canvas.SetLeft(txt2, 75);
        myCanvas.Children.Add(txt2);
        mainWindow.Content = myCanvas;
        mainWindow.Title = "Canvas Sample";
        mainWindow.Show();
    }
}

WindowTitle = "Canvas Sample"
'Create a Canvas as the root Panel
Dim myCanvas As New Canvas()
myCanvas.Background = Brushes.LightSteelBlue

Dim txt1 As New TextBlock
txt1.FontSize = 14
txt1.Text = "Hello World!"
Canvas.SetLeft(txt1, 10)
Canvas.SetTop(txt1, 100)
myCanvas.Children.Add(txt1)

'Add a second text element to show how absolute positioning works in a Canvas
Dim txt2 As New TextBlock
txt2.FontSize = 22
txt2.Text = "Isn't absolute positioning handy?"
Canvas.SetLeft(txt2, 75)
Canvas.SetTop(txt2, 200)
myCanvas.Children.Add(txt2)
Me.Content = myCanvas

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