Comment : utiliser les propriétés attachées d'une zone de dessin pour positionner des éléments enfants
Mise à jour : novembre 2007
Cet exemple montre comment utiliser les propriétés attachées de Canvas pour positionner des éléments enfants.
Exemple
L'exemple suivant ajoute quatre éléments Button comme éléments enfants d'un Canvas parent. Chaque élément enfant représente une propriété attachée distincte de Canvas : Bottom, Left, Right et Top. Chaque Button est positionné par rapport au Canvas parent et d'après sa valeur de propriété assignée.
WindowTitle = "Attached Properties Sample"
' Add a Border
Dim myBorder As New Border()
myBorder.HorizontalAlignment = Windows.HorizontalAlignment.Left
myBorder.VerticalAlignment = Windows.VerticalAlignment.Top
myBorder.BorderBrush = Brushes.Black
myBorder.BorderThickness = New Thickness(2)
' Create a Canvas as the root Panel
Dim myCanvas As New Canvas()
myCanvas.Background = Brushes.LightBlue
myCanvas.Width = 400
myCanvas.Height = 400
' Create the child Button elements
Dim myButton1 As New Button()
Dim myButton2 As New Button()
Dim myButton3 As New Button()
Dim myButton4 As New Button()
' Set Positioning attached properties on Button elements
Canvas.SetTop(myButton1, 50)
myButton1.Content = "Canvas.Top=50"
Canvas.SetBottom(myButton2, 50)
myButton2.Content = "Canvas.Bottom=50"
Canvas.SetLeft(myButton3, 50)
myButton3.Content = "Canvas.Left=50"
Canvas.SetRight(myButton4, 50)
myButton4.Content = "Canvas.Right=50"
' Add Buttons to the Canvas' Children collection
myCanvas.Children.Add(myButton1)
myCanvas.Children.Add(myButton2)
myCanvas.Children.Add(myButton3)
myCanvas.Children.Add(myButton4)
' Add the Canvas as the lone Child of the Border
myBorder.Child = myCanvas
Me.Content = myBorder
// Create the application's main window
mainWindow = new Window ();
mainWindow.Title = "Canvas Attached Properties Sample";
// Add a Border
Border myBorder = new Border();
myBorder.HorizontalAlignment = HorizontalAlignment.Left;
myBorder.VerticalAlignment = VerticalAlignment.Top;
myBorder.BorderBrush = Brushes.Black;
myBorder.BorderThickness = new Thickness(2);
// Create the Canvas
Canvas myCanvas = new Canvas();
myCanvas.Background = Brushes.LightBlue;
myCanvas.Width = 400;
myCanvas.Height = 400;
// Create the child Button elements
Button myButton1 = new Button();
Button myButton2 = new Button();
Button myButton3 = new Button();
Button myButton4 = new Button();
// Set Positioning attached properties on Button elements
Canvas.SetTop(myButton1, 50);
myButton1.Content = "Canvas.Top=50";
Canvas.SetBottom(myButton2, 50);
myButton2.Content = "Canvas.Bottom=50";
Canvas.SetLeft(myButton3, 50);
myButton3.Content = "Canvas.Left=50";
Canvas.SetRight(myButton4, 50);
myButton4.Content = "Canvas.Right=50";
// Add Buttons to the Canvas' Children collection
myCanvas.Children.Add(myButton1);
myCanvas.Children.Add(myButton2);
myCanvas.Children.Add(myButton3);
myCanvas.Children.Add(myButton4);
// Add the Canvas as the lone Child of the Border
myBorder.Child = myCanvas;
// Add the Border as the Content of the Parent Window Object
mainWindow.Content = myBorder;
mainWindow.Show ();
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation" WindowTitle="Canvas Attached Properties Sample">
<Border HorizontalAlignment="Left" VerticalAlignment="Top" BorderBrush="Black" BorderThickness="2">
<Canvas Background="LightBlue" Width="400" Height="400">
<Button Canvas.Top="50">Canvas.Top="50"</Button>
<Button Canvas.Bottom="50">Canvas.Bottom="50"</Button>
<Button Canvas.Left="50">Canvas.Left="50"</Button>
<Button Canvas.Right="50">Canvas.Right="50"</Button>
</Canvas>
</Border>
</Page>
Voir aussi
Tâches
Propriétés attachées d'une zone de dessin, exemple
Concepts
Vue d'ensemble des propriétés attachées