概述
Silverlight 2 Beta 1版本发布了,无论从Runtime还是Tools都给我们带来了很多的惊喜,如支持框架语言Visual Basic, Visual C#, IronRuby, Ironpython,对JSON、Web Service、WCF以及Sockets的支持等一系列新的特性。《一步一步学Silverlight 2系列》文章将从Silverlight 2基础知识、数据与通信、自定义控件、动画、图形图像等几个方面带您快速进入Silverlight 2开发
本文将综合前面十七篇讲过的界面布局、样式、控件模板、数据绑定、网络通信等几个方面,来开发一个综合实例——简易RSS阅读器。
界面布局
我们最终完成的RSS阅读器界面如下:
定义一个三行两列的Grid,分别放置顶部信息、分割线和下面的内容区:
<Grid.RowDefinitions> <RowDefinition Height="50"></RowDefinition> <RowDefinition Height="20"></RowDefinition> <RowDefinition Height="*"></RowDefinition></Grid.RowDefinitions><Grid.ColumnDefinitions> <ColumnDefinition W
idth="240"></ColumnDefinition> <ColumnDefinition Width="*"></ColumnDefinition></Grid.ColumnDefinitions>
设计顶部输入区域,对Grid第一行做合并,并且放置一个StackPanel:
<StackPanel x:Name="Header" Orientation="Horizontal" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2"> <
Image Source="Rss.png" Width="32" Height="32" Margin="10 0 10 0"></Image> <Border Style="{StaticResource titleBorder}"> <TextBlock Text="基于Silverlight的RSS阅读器" Foreground="#FFFFFF" VerticalAlignment="Center" Margin="12 0 0 0"></TextBlock> </Border> <WatermarkedTextBox x:Name="feedAddress" Width="300" Height="35" FontSize="16" Margin="10 0 10 0"> <WatermarkedTextBox.Watermark> <TextBlock Text="请输入有效的RSS地址" VerticalAlignment="Center" Foreground="#FBA430" FontSize="16"></TextBlock> </WatermarkedTextBox.Watermark> </WatermarkedTextBox> <Button x:Name="displayButton" Style="{StaticResource button}" Content="显 示" Click="displayButton_Click"></Button> <Button x:Name="fullScreenButton" Style="{StaticResource button}" Content="全 屏" Click="fullScreenButton_Click"></Button></StackPanel>
鉴于两个按钮的风格一致,在App.xaml中定义一个button样式:
<Style x:Key="button" TargetType="Button"> <Setter Property="Width" Value="100"></Setter> <Setter Property="Height" Value="35"></Setter> <Setter Property="Background" Value="#FBA430"></Setter> <Setter Property="Foreground" Value="#FBA430"></Setter> <Setter Property="FontSize" Value="16"></Setter></Style><Style x:Key="titleBorder" TargetType="Border"> <Setter Property="CornerRadius" Value="10"></Setter> <Setter Property="Width" Value="220"></Setter> <Setter Property="Height" Value="40"></Setter> <Setter Property="Background"> <Setter.Value> <LinearGradientBrush StartPoint="0,0"> <GradientStop Color="#FBA430" Offset="0.0" /> <GradientStop Color="#FEF4E7" Offset="
0.5" /> <GradientStop Color="#FBA430" Offset="1.0" /> </LinearGradientBrush> </Setter.Value> </Setter></Style>
定义分割线,用Rectangle来表示:
<StackPanel Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" VerticalAlignment="Center"> <Rectangle Style="{StaticResource rectangle}"/></StackPanel>
为了显示出渐变的样式,我们定义样式如下:
<Style x:Key="rectangle" TargetType="Rectangle"> <Setter Property="Width" Value="780"></Setter> <Setter Property="Height" Value="5"></Setter> <Setter Property="RadiusX" Value="3"></Setter> <Setter Property="RadiusY" Value="3"></Setter> <Setter Property="Fill"> <Setter.Value> <LinearGradientBrush StartPoint="0,0"> <GradientStop Color="#FEF4E7" Offset="0.0" /> <GradientStop Color="#FBA430" Offset="1.0" /> </LinearGradientBrush> </Setter.Value> </Setter></Style>
定义左边的列表区,用ListBox来显示,并且定义ItemTemplate:
<ListBox x:Name="PostsList" Grid.Column="0" Grid.Row="2" Margin="10 5 5 10" SelectionChanged="PostsList_SelectionChanged"> <ListBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding Title.Text}" TextWrapping="Wrap" Width="200"/> </DataTemplate> </ListBox.ItemTemplate></ListBox>
最后定义右边的详细信息区域,在StackPanel中垂直放置三个Border:
<StackPanel x:Name="Detail" Grid.Column="1" Grid.Row="2"> <Border CornerRadius="10" Background="#CDFCAE" Margin="10 5 10 10" Width="540" Height="40"> <TextBlock Text="{Binding Title.Text}" TextWrapping="Wrap" VerticalAlignment="Center" Foreground="Red"/> </Border> <Border CornerRadius="10" Background="#CDFCAE" Margin="10 5 10 10" Width="540" Height="300"> <TextBlock Text="{Binding Summary.Text}" TextWrapping="Wrap"/> </Border> <Border CornerRadius="10" Background="#CDFCAE" Margin="10 5 10 10" Width="540" Height="40"> <StackPanel Orientation="Horizontal"> <TextBlock Text="评论日期:" TextWrapping="Wrap" Foreground="Red" VerticalAlignment="Center"/> <TextBlock Text="{Binding PublishDate}" TextWrapping="Wrap" Foreground="Red" VerticalAlignment="Center"/> </StackPanel> </Border></StackPanel>
界面布局到此大功告成。
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