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How to create a Viewbox in WPF and C#

Mahesh Chand Resources Jul 13, 2009
A ViewBox control is used to stretch and scale a single child item to fill the available space.
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A ViewBox control is used to stretch and scale a single child item to fill the available space.

Creating a ViewBox

The Viewbox element represents a WPF ViewBox control in XAML.

 

<Viewbox />

 

Viewbox has a Stretch property that defines how contents are fit in the space and its value can be – Fill, None, Uniform, or UniformToFill.

 

The code snippet in Listing 1 creates a Viewbox control and sets its stretch to fill. The output looks like Figure 1 where child control is filled in the Viewbox area.

 

<Viewbox Height="200" HorizontalAlignment="Left" Margin="19,45,0,0"

         Name="viewbox1" VerticalAlignment="Top" Width="300"

         Stretch="Fill">

    <Ellipse Width="100" Height="100" Fill="Red" />   

</Viewbox>

Listing 1

The output looks like Figure 1.

Viewbox.gif

Figure 1

Creating a ViewBox Dynamically

The following code snippet creates a Viewbox at run-time.

 

private void CreateViewboxDynamically()

{

    Viewbox dynamicViewbox = new Viewbox();

    dynamicViewbox.StretchDirection = StretchDirection.Both;

    dynamicViewbox.Stretch = Stretch.Fill;

    dynamicViewbox.MaxWidth = 300;

    dynamicViewbox.MaxHeight = 200;

 

    Ellipse redCircle = new Ellipse();

    redCircle.Height = 100;

    redCircle.Width = 100;

    redCircle.Fill = new SolidColorBrush(Colors.Red);

    dynamicViewbox.Child = redCircle;

 

    RootLayout.Children.Add(dynamicViewbox);

}

 


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