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Exemple :
Cet exemple montre comment modifier la valeur des propriétés StretchDirection et Stretch d’un Viewbox.
Le premier exemple utilise le langage XAML (Extensible Application Markup Language) pour définir un Viewbox élément. Il affecte un MaxWidth et un MaxHeight de 400. L'exemple imbrique un élément Image dans le Viewbox. Button les éléments qui correspondent aux valeurs de propriété des énumérations Stretch et StretchDirection manipulent le comportement d’étirement de l'élément imbriqué Image.
<StackPanel Margin="0,0,0,10" HorizontalAlignment="Center" Orientation="Horizontal" DockPanel.Dock="Top">
<Button Name="btn1" Click="stretchNone">Stretch="None"</Button>
<Button Name="btn2" Click="stretchFill">Stretch="Fill"</Button>
<Button Name="btn3" Click="stretchUni">Stretch="Uniform"</Button>
<Button Name="btn4" Click="stretchUniFill">Stretch="UniformToFill"</Button>
</StackPanel>
<StackPanel Margin="0,0,0,10" HorizontalAlignment="Center" Orientation="Horizontal" DockPanel.Dock="Top">
<Button Name="btn5" Click="sdUpOnly">StretchDirection="UpOnly"</Button>
<Button Name="btn6" Click="sdDownOnly">StretchDirection="DownOnly"</Button>
<Button Name="btn7" Click="sdBoth">StretchDirection="Both"</Button>
</StackPanel>
<TextBlock DockPanel.Dock="Top" Name="txt1" />
<TextBlock DockPanel.Dock="Top" Name="txt2" />
<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
<Viewbox MaxWidth="500" MaxHeight="500" Name="vb1">
<Image Source="tulip_farm.jpg"/>
</Viewbox>
</StackPanel>
Le fichier code-behind suivant gère les ButtonClick événements définis par l’exemple XAML précédent.
private void stretchNone(object sender, RoutedEventArgs e)
{
vb1.Stretch = System.Windows.Media.Stretch.None;
txt1.Text = "Stretch is now set to None.";
}
private void stretchFill(object sender, RoutedEventArgs e)
{
vb1.Stretch = System.Windows.Media.Stretch.Fill;
txt1.Text = "Stretch is now set to Fill.";
}
private void stretchUni(object sender, RoutedEventArgs e)
{
vb1.Stretch = System.Windows.Media.Stretch.Uniform;
txt1.Text = "Stretch is now set to Uniform.";
}
private void stretchUniFill(object sender, RoutedEventArgs e)
{
vb1.Stretch = System.Windows.Media.Stretch.UniformToFill;
txt1.Text = "Stretch is now set to UniformToFill.";
}
private void sdUpOnly(object sender, RoutedEventArgs e)
{
vb1.StretchDirection = System.Windows.Controls.StretchDirection.UpOnly;
txt2.Text = "StretchDirection is now UpOnly.";
}
private void sdDownOnly(object sender, RoutedEventArgs e)
{
vb1.StretchDirection = System.Windows.Controls.StretchDirection.DownOnly;
txt2.Text = "StretchDirection is now DownOnly.";
}
private void sdBoth(object sender, RoutedEventArgs e)
{
vb1.StretchDirection = System.Windows.Controls.StretchDirection.Both;
txt2.Text = "StretchDirection is now Both.";
}
Private Sub stretchNone(ByVal sender As Object, ByVal args As RoutedEventArgs)
vb1.Stretch = System.Windows.Media.Stretch.None
txt1.Text = "Stretch is now set to None."
End Sub
Private Sub stretchFill(ByVal sender As Object, ByVal args As RoutedEventArgs)
vb1.Stretch = System.Windows.Media.Stretch.Fill
txt1.Text = "Stretch is now set to Fill."
End Sub
Private Sub stretchUni(ByVal sender As Object, ByVal args As RoutedEventArgs)
vb1.Stretch = System.Windows.Media.Stretch.Uniform
txt1.Text = "Stretch is now set to Uniform."
End Sub
Private Sub stretchUniFill(ByVal sender As Object, ByVal args As RoutedEventArgs)
vb1.Stretch = System.Windows.Media.Stretch.UniformToFill
txt1.Text = "Stretch is now set to UniformToFill."
End Sub
Private Sub sdUpOnly(ByVal sender As Object, ByVal args As RoutedEventArgs)
vb1.StretchDirection = System.Windows.Controls.StretchDirection.UpOnly
txt2.Text = "StretchDirection is now UpOnly."
End Sub
Private Sub sdDownOnly(ByVal sender As Object, ByVal args As RoutedEventArgs)
vb1.StretchDirection = System.Windows.Controls.StretchDirection.DownOnly
txt2.Text = "StretchDirection is now DownOnly."
End Sub
Private Sub sdBoth(ByVal sender As Object, ByVal args As RoutedEventArgs)
vb1.StretchDirection = System.Windows.Controls.StretchDirection.Both
txt2.Text = "StretchDirection is now Both."
End Sub
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