19: Windows Presentation Foundation in Visual C#

Paint Code128 in Visual C# 19: Windows Presentation Foundation

19: Windows Presentation Foundation
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The interim variable is useful only for debugging; there is no other reason not to write:
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Title = (lb.SelectedItem as ImageURL).Name.ToString( );
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You can also get at both the currently selected president s ImageURL and the previously selected ImageURL through the SelectionChangedEventArgs parameter.
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The Complete XAML File
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If you re not sitting in front of your computer right now, Example 19-8 has the complete XAML listing. Please replace the ellipses (...) in the URLs in this listing with:
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http://www.whitehouse.gov/history/presidents/images
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We omitted this long URL from the listing to save space.
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<Window x:Class="Presidential_Browser.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:Presidential_Browser" Title="Window1" Height="300" Width="300"> <Window.Resources> <LinearGradientBrush x:Key="ListBoxGradient" StartPoint="0,0" EndPoint="0,1"> <GradientStop Color="#90000000" Offset="0" /> <GradientStop Color="#40000000" Offset="0.005" /> <GradientStop Color="#10000000" Offset="0.04" /> <GradientStop Color="#20000000" Offset="0.945" /> <GradientStop Color="#60FFFFFF" Offset="1" /> </LinearGradientBrush> <Style x:Key="SpecialListStyle" TargetType="{x:Type ListBox}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ListBox}" > <Border BorderBrush="Gray" BorderThickness="1" CornerRadius="6" Background= "{DynamicResource ListBoxGradient}" > <ScrollViewer VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Visible"> <StackPanel IsItemsHost="True" Orientation="Horizontal" HorizontalAlignment="Left" /> </ScrollViewer> </Border> </ControlTemplate>
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</Setter.Value> </Setter> </Style> <Style x:Key="SpecialListItem" TargetType="{x:Type ListBoxItem}"> <Setter Property="MaxHeight" Value="75" /> <Setter Property="MinHeight" Value="75" /> <Setter Property="Opacity" Value=".75" /> <Style.Triggers> <EventTrigger RoutedEvent="Mouse.MouseEnter"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="MaxHeight" To="85" /> <DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="Opacity" To="1.0" /> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> <EventTrigger RoutedEvent="Mouse.MouseLeave"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="MaxHeight" /> <DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="Opacity" /> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> </Style.Triggers> </Style> <local:Images x:Key="Presidents"> <local:ImageURL ImageURI=".../gw1.gif" Name="George Washington" /> <local:ImageURL ImageURI=".../ja2.gif" Name="John Adams" /> <local:ImageURL ImageURI=".../tj3.gif" Name="Thomas Jefferson" /> <local:ImageURL ImageURI=".../jm4.gif" Name="James Madison" /> <local:ImageURL ImageURI=".../jm5.gif" Name="James Monroe" /> <local:ImageURL ImageURI=".../ja6.gif" Name="John Quincy Adams" /> <local:ImageURL ImageURI=".../aj7.gif" Name="Andrew Jackson" /> <local:ImageURL ImageURI=".../mb8.gif" Name="Martin Van Buren" /> <local:ImageURL ImageURI=".../wh9.gif" Name="William H. Harrison" /> <local:ImageURL ImageURI=".../jt10_1.gif" Name="John Tyler" /> <local:ImageURL ImageURI=".../jp11.gif" Name="James K. Polk" /> <local:ImageURL ImageURI=".../zt12.gif" Name="Zachary Taylor" />
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19: Windows Presentation Foundation
<local:ImageURL <local:ImageURL <local:ImageURL <local:ImageURL <local:ImageURL <local:ImageURL <local:ImageURL <local:ImageURL </local:Images> ImageURI=".../mf13.gif" ImageURI=".../fp14.gif" ImageURI=".../jb15.gif" ImageURI=".../al16.gif" ImageURI=".../aj17.gif" ImageURI=".../ug18.gif" ImageURI=".../rh19.gif" ImageURI=".../jg20.gif" Name="Millard Fillmore" /> Name="Franklin Pierce" /> Name="James Buchanan" /> Name="Abraham Lincoln" /> Name="Andrew Johnson" /> Name="Ulysses S. Grant" /> Name="Rutherford B. Hayes" /> Name="James Garfield" />
</Window.Resources> <Grid Width="300" Height="190" DataContext="{StaticResource Presidents}"> <Grid.RowDefinitions> <RowDefinition Height="20" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <StackPanel Grid.Row="0"> <TextBlock FontSize="14" Grid.Row="0" > United States Presidents</TextBlock> </StackPanel> <StackPanel Grid.Row="1" Grid.ColumnSpan="3" > <ListBox Style="{StaticResource SpecialListStyle}" Name="PresPhotoListBox" Margin="0,0,0,20" SelectionChanged="PresPhotoListBox_SelectionChanged" ItemsSource="{Binding }" IsSynchronizedWithCurrentItem="True" SelectedIndex="0" ItemContainerStyle= "{StaticResource SpecialListItem}" > <ListBox.ItemTemplate> <DataTemplate> <Border VerticalAlignment="Center" HorizontalAlignment="Center" Padding="4" Margin="2" Background="White"> <Image Source="{Binding Path=ImageURI}" /> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </Grid> </Window>
Run the application now, and you should see that it looks like Figure 19-7 (shown previously). The individual images animate when you mouse over them, and clicking one changes the title bar of the window to show the president s name.
C# and WPF |
Silverlight
As you ve seen with WPF, the flexibility of defining the design of your interface in XML lets you include features that you wouldn t have thought possible before. In fact, you can make Windows applications that don t look like Windows applications at all, but more like web applications. The idea of separating the design of the application from the underlying functionality opens up interesting possibilities. In Windows and WPF applications, both the interface and the functional code reside on your local machine; the separation is entirely in the design stage. On the Web, though, the application usually resides on a remote server, with the client using only a browser. ASP.NET with AJAX brings the two a bit closer together, where some of the controls are created in code that runs in the browser, reducing the number of times the browser needs to get data from the server, which makes for a faster, smoother user experience. Silverlight narrows the gap even more, by bringing the WPF tools to run in browsers over the Web. Silverlight requires a browser plug-in that the remote user has to accept. That plug-in contains a carefully chosen subset of the Common Language Runtime (CLR), allowing Silverlight applications to use managed code languages like VB.NET or C# and to implement applications built on a subset of XAML. The net result is that Silverlight applications are much faster, are richer, and have capabilities that are simply not possible with AJAX, but they are limited to running on IE, Firefox, and Safari on Windows, the Mac, and Linux, for now. Silverlight is in version 2.0 at the time of this writing, and a lot of development remains to be done, but the possibilities are very exciting. Learning Silverlight is not hard, and what you ve learned about XAML in this chapter gives you a significant head start, but there is quite a bit to it. A full discussion would require a book in itself. See Programming Silverlight by Jesse Liberty and Tim Heuer (O Reilly) to learn more.
Summary
Windows Presentation Foundation (WPF) is a system intended to combine the functionality of Windows Forms with greater flexibility in interface design. In WPF, the presentation of the application is kept in a separate file, written in XAML, which is a dialect of XML. When you start a new WPF project, Visual Studio opens both the Design window and the XAML window. Changes made in one window are immediately reflected in the other. The XAML file uses a Window element as its root element.
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