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Styles
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Styles in Silverlight 3.0 can now be modified at runtime and support inheritance.
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Applying Styles Dynamically
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The following code shows how to apply a style to a button at runtime: myButton.Style=(Style)Application.Current.Resources["MyHorridFuciaStyle"];
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WPF 4.0 AND SILVERLIGHT 3.0
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Style Inheritance
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Silverlight 3.0 allows you to create styles that inherit from another style (sort of like CSS) by specifying a parent style in the BasedOn property. The following code creates a style inheriting from MyHorridFuciaStyle: <Style x:Key="HybridStyle" TargetType="Button" BasedOn="{StaticResource MyHorridFuciaStyle}"></Style>
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Merge Dictionary Support
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It is now possible to refer to external resource dictionary files within your application: <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="myExternalResources.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary>
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Save File Dialog
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A major issue in previous versions of Silverlight was that there was no capability of transferring files to a user. Silverlight 3.0 has a new file save dialog that allows users to save content to their local machine rather than to isolated storage. This example creates a text file and then gives the user the option to save it: void cmdSave_Click(object sender, RoutedEventArgs e) { SaveFileDialog SaveDialog = new SaveFileDialog(); if (SaveDialog.ShowDialog() == true) { System.IO.Stream fs = null; try { fs = SaveDialog.OpenFile(); byte[] info = (new System.Text.UTF8Encoding(true)).GetBytes("Test text to write to file"); fs.Write(info, 0, info.Length); } finally { fs.Close(); } } }
WPF 4.0 AND SILVERLIGHT 3.0
Filtering Files in SaveDialog
Files shown in the SaveDialog window can be filtered by type using the Filter and FilterIndex properties. The Filter property allows you to specify a pipe-delimitated list of file types and FilterIndex (0 based) sets the default filter to use. This example shows how to show two filter options with the default filter option set to all files: SaveDialog.Filter = "Text Files (.txt)|*.txt|All Files|*.*"; //Set default filter to All Files SaveDialog.FilterIndex = 1;
Element to Element Binding
In Silverlight 3.0 and WPF4.0, you can now bind directly to another element. This example binds a TextBlock s Text property to the Text property of the text box txtValue: <TextBox x:Name="txtValue" Width="200" Canvas.Top="50" ></TextBox> <TextBlock Text="{Binding Text, ElementName=txtValue}"></TextBlock>
Effects and Transformations
WPF 4.0 and Silverlight 3.0 introduce some great new effects functionality. Let s take a look at these now.
Plane Projection
Plane Projection is a new effect that allows you to rotate XAML elements around a 3D axis. Figure 15-27 shows the results of a Plane Projection transformation:
WPF 4.0 AND SILVERLIGHT 3.0
Figure 15-27. RotationY transformation to an image The effect was created with this XAML: <Image Source="/pic1.jpg"> <Image.Projection> <PlaneProjection RotationY="130"></PlaneProjection> </Image.Projection> </Image> Note the transformation effect simulates rotating elements around the X, Y, or Z axis, but does not apply light or shading effects.
WPF 4.0 AND SILVERLIGHT 3.0
THE RESULT OF A ROTATIONX TRANSFORM
You might have expected Figure 15-27 to be the result of a X rather than Y axis rotation. It can help to imagine that the Y axis is like a vertical pole, and the image is placed in front of this pole (see Figure 15-28). When the transformation is applied the image is rotated around whichever pole is specified (in this case, the Y pole).
Figure 15-28. How Silverlight 3.0 views rotation transformations
Don t think that perspective transforms can be used only on images. Perspective transformations can also be applied to any WPF element allowing you to create some really weird and cool animation effects and the best part is that the control will still function as per normal, detecting clicks and events! This can be used for some silly (and unfriendly UI design), as Figure 15-29 shows.
Figure 15-29. Projection transform applied to stack panel
WPF 4.0 AND SILVERLIGHT 3.0
Easing Effects
Earlier, I discussed some of the new easing effects in WPF4.0. Let s take a look at the BounceEase effect, which animates an element to makes it look like a ball bouncing up and down that gradually loses height with each bounce. The level of springiness can be controlled through the adeptly named Bounciness property, in which lower numbers are more bouncy (e.g., a rubber ball) than higher numbers (e.g., a cricket ball). This XAML shows how to apply a BounceEase effect to an image (note you will have to start this storyboard to see the animation): <Canvas> <Canvas.Resources> <Storyboard x:Name="bounceyAnim"> <DoubleAnimation Duration="0:0:3" From="0" To="300" Storyboard.TargetName="myPic" Storyboard.TargetProperty="(Canvas.Top)"> <DoubleAnimation.EasingFunction> <BounceEase Bounciness="2" Bounces="5" EasingMode="EaseOut"></BounceEase> </DoubleAnimation.EasingFunction> </DoubleAnimation> </Storyboard> </Canvas.Resources> <Image Source="/pic1.jpg" Width="200" Height="200" Canvas.Left="50" Canvas.Top="50" x:Name="myPic"></Image> </Canvas>
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