FIGURE 2-16 Buttons in a StackPanel. in .NET

Printer Code39 in .NET FIGURE 2-16 Buttons in a StackPanel.

FIGURE 2-16 Buttons in a StackPanel.
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When you have many controls in a StackPanel, you might go beyond the bounds of the Panel control itself, in which case the controls are clipped to the bounds of the StackPanel. To get around this problem, you can use a ScrollViewer, which is explained in the next section.
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Using the ScrollViewer
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The ScrollViewer provides scroll bars so that the user can pan around the contents of a layout if the contents exceed the bounds of the ScrollViewer. A ScrollViewer can contain only one child control, so unless you are using a control that needs a large view area (such as an Image), you use a ScrollViewer typically only to contain other containers. For example, following is a StackPanel in which the contents exceed the vertical space available to it:
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<StackPanel Height="300" Width="199"> <Button Height="44" Width="86" Content="Button"/> <Button Height="57" Width="75" Content="Button"/> <Button Height="70" Width="59" Content="Button"/> <Button Height="109" Width="95" Content="Button"/> <Button Height="104" Width="88" Content="Button"/> </StackPanel>
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The StackPanel in this example is 300 pixels high, but the total height of all the buttons is 384 pixels, so the bottom button is cropped, as you can see in Figure 2-17.
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2 Using Expression Blend with Silverlight
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FIGURE 2-17 Cropped elements in a StackPanel.
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Now, if you contain this StackPanel in a ScrollViewer, you ll get better results. Note that the StackPanel still crops the buttons if you do not change its height, so if you need to have an area of height 300, you can set the ScrollViewer to have this height, and then set the StackPanel to have a different height. Here s the XAML to do this:
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<ScrollViewer Height="300" Width="300"> <StackPanel Height="400" Width="199"> <Button Height="44" Width="86" Content="Button"/> <Button Height="57" Width="75" Content="Button"/> <Button Height="70" Width="59" Content="Button"/> <Button Height="109" Width="95" Content="Button"/> <Button Height="104" Width="88" Content="Button"/> </StackPanel> </ScrollViewer>
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You can see how the ScrollViewer created here appears in Figure 2-18.
FIGURE 2-18 Using the ScrollViewer.
Part I Introducing Silverlight 3
Now you can scroll up and down the button list and the buttons all are available; none are unavailable because of cropping if you use the ScrollViewer. Note that the button at the bottom in Figure 2-18 can be revealed by dragging the scroll bar down.
The Border Control
Not to be confused with the Border Patrol part of the Department of Homeland Security you use the Border control simply to draw a border, background, or both around another element. For example, consider the following XAML:
<Border Height="318" Width="405" Background="#FFFF0000"> <Button Height="234" HorizontalAlignment="Center" VerticalAlignment="Center" Width="239" RenderTransformOrigin="0.5,0.5" Content="Button"> </Button> </Border>
This XAML creates a red background behind the button.
Placing and Customizing Visual Elements
The visual elements available are defined in the XAML specification, and you learn about each of them in detail in 4. Right now, take a look at the basic shapes and tools that are available on the toolbar. These include the following shapes: Rectangle Select this shape to draw a straight-sided quadrilateral with 90-degree angles at each corner. You can make a square by creating a Rectangle with equal width and height properties. Ellipse Use this shape to draw an elliptical figure, an oval. You can make it a Circle by making the width and height properties equal. Line The Line shape simply draws a straight line between two end points.
You can use the following tools available on the toolbar to create free-form shapes: Pen Use this tool to draw a set of connected line segments represented by an underlying Path element. Pencil Use this tool to draw a set of connected elements, which can be lines or curves. Expression Blend represents the strokes that the user draws with an underlying Path element.
2 Using Expression Blend with Silverlight
Each of these visual elements, including those created with the Pen and Pencil tools, are represented by a single element, and this element can then be treated as any other object; that is, you can modify it in many ways, including setting its properties or animating it. For example, consider Figure 2-19 in which the Pencil tool has been used to draw a set of connected curves to create a representation of the word Hello in script. Look on the Objects And Timeline view, and you ll see the object represented as a Path.
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