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SIZING AND POSITIONING
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Another performance consideration has to do with sizing and positioning elements. For example, if you change the margin of an element or modify its width or height, you ll trigger a layout pass. But, if you instead call a render transform to either move
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or resize that element, you won t trigger a pass. We ll cover render transforms in the next section. Understanding the layout system helps take some of the mystery out of what happens when you size elements in Silverlight, and they don t quite do what you might ve expected them to do. It s also a key concept to understand if you plan to implement your own panels/container controls. WPF has the concept of a layout transform. This type of transform is parallel to a render transform but triggers a layout pass. As we ve seen here, triggering a layout pass can be an expensive operation, especially if done inside an animation. For performance considerations and due to their relatively low adoption, layout transforms were omitted from Silverlight. The render transforms provided by Silverlight are almost always adequate to solve problems we used to solve with layout transforms and often superior. Let s look at them next.
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The Transform element gives you the flexibility to alter the appearance of any UIElement within Silverlight. Transforms give you the flexibility to change the size, location, gyration, and angling apart from the other related properties that have been defined up to this point. The real value of transforms will become apparent when you learn about animations in the next chapter. But first, table 6.2 lists the ways UIElement objects can be altered.
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Table 6.2 A list of the available transformation options Transform Description Rotates an object by a specific Angle. Provides a zoom in or out effect by specified amounts Tilts an element by defined amounts Moves an element by specified amounts Not a type of transform; rather, a container that groups multiple transforms to be applied Provides an easy way to combine the other four transforms Provides a way to use a low-level matrix to perform multiple simultaneous transforms
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RotateTransform ScaleTransform SkewTransform TranslateTransform TransformGroup CompositeTransform MatrixTransform
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As table 6.2 describes, each Transform has its own special purpose. As you ll see within the next few sections, applying a transformation generally involves altering one or two basic properties.
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Rendering, layout, and transforming
RotateTransform
The RotateTransform is responsible for rotating an object clockwise around a specified point by a specified angle. This rotation affects the local coordinate system of the rotated object. If you need to rotate an object in place, you need to specify the center point as the center of the object being rotated. Listing 6.10 shows a basic square rotated clockwise by 30 degrees. The dashed version represents the original square before the transform was applied.
Listing 6.10 A square that has been rotated by 30 degrees
Result:
XAML:
<Rectangle Width="50" Height="50" Fill="Green" Stroke="Black"> <Rectangle.RenderTransform> <TransformGroup> <RotateTransform Angle="30"/> </TransformGroup> </Rectangle.RenderTransform> </Rectangle>
The Angle property specifies to rotate clockwise around the optional CenterX and CenterY properties, which default to 0. Because these values are initially set to 0, an element will rotate around the upper-left corner. If you set these values to the center of the object you re rotating, it ll give the element the appearance of rotating in place. When rotating elements, sometimes it becomes necessary to rotate them counterclockwise. As you may have already guessed, you perform this task by providing a negative value within the Angle property. Note that an element will complete one full rotation if the Angle is set to 360 or 360.
ScaleTransform
The ScaleTransform enables you to expand or contract an object horizontally or vertically, empowering you to create the effect of zooming in or out. Listing 6.11 shows how a basic square was zoomed in on via a ScaleTransform.
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