Como: Criar e usar um Canvas
Este exemplo mostra como criar e usar uma instância do objeto Canvas.
Exemplo
O exemplo a seguir explicitamente posiciona dois elementos TextBlock usando os métodos SetTop e SetLeft de Canvas. O exemplo também atribui uma cor Background de LightSteelBlue para o Canvas.
.gif "Observação") Observação: |
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Quando você usa Extensible Application Markup Language (XAML) para posicionar TextBlock elementos, usar o Top e Left Propriedades. |
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
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();
}
}
<Page WindowTitle="Canvas Sample" xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation">
<Canvas Background="LightSteelBlue">
<TextBlock FontSize="14" Canvas.Top="100" Canvas.Left="10">Hello World!</TextBlock>
<TextBlock FontSize="22" Canvas.Top="200" Canvas.Left="75">Isn't absolute positioning handy?</TextBlock>
</Canvas>
</Page>