稳扎稳打Silverlight(40) - 3.0绑定之Element to Element Binding, RelativeSource; 样式之动态修改样式, 样式继承, 自定义光标

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稳扎稳打Silverlight(40) - 3.0绑定之Element to Element Binding, RelativeSource; 样式之动态修改样式, 样式继承, 自定义光标

作者：webabcd


介绍
Silverlight 3.0 绑定的新增功能，样式相关的新增功能

• Element to Element Binding - Element 到 Element 之间的绑定 
• RelativeSource - 一个扩展标记，用于指定关联数据源为 Self 或 TemplatedParent 
• 动态修改样式 - 在 Runtime 时修改样式 
• 样式继承 - 通过 BasedOn 使某样式可以继承自另一个样式 
• 自定义光标 - 通过 CaretBrush 自定义输入框的光标的样式 

在线DEMO
http://www.cnblogs.com/webabcd/archive/2009/08/04/1538238.html


示例
1、Element to Element 绑定的演示
Element2Element.xaml

<navigation:Page x:Class="Silverlight30.Binding.Element2Element" 
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="Element to Element Binding Page">
    <Grid x:Name="LayoutRoot">
        <StackPanel VerticalAlignment="Top" HorizontalAlignment="Left">
        
            <!--Element to Element 绑定的支持-->
            
            <!--
                绑定方式1：{Binding 绑定的属性名称, Mode=, ElementName=绑定的对象名称}
                绑定方式2：{Binding ElementName=绑定的对象名称, Path=绑定的属性名称, Mode=}
                Mode的可用值有：OneTime, OneWay, TwoWay
            -->
            <Slider x:Name="silder" Value="50" Minimum="1" Maximum="100" LargeChange="5" Width="500"></Slider>
            <TextBox Text="{Binding Value, Mode=TwoWay, ElementName=silder}" />
            
            <Slider Minimum="1" Maximum="100" LargeChange="5" Width="500"
                    Value="{Binding ElementName=textBox, Path=Text, Mode=TwoWay }"></Slider>
            <TextBox x:Name="textBox" Text="50" />
            
        </StackPanel>
    </Grid>
</navigation:Page>

2、RelativeSource 扩展标记应用的 Demo
RelativeSourceDemo.xaml

<navigation:Page x:Class="Silverlight30.Binding.RelativeSourceDemo" 
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="RelativeSourceDemo Page">
    <Grid x:Name="LayoutRoot">
    
        <!--
            RelativeSource - 一个扩展标记，用于指定关联数据源。这是 Silverlight 3.0 绑定的新增功能
                RelativeSource={RelativeSource Self} - 指定数据源为自己本身
                RelativeSource={RelativeSource TemplatedParent} - 在 ControlTemplate 出现，指定数据源为引用了该 ControlTemplate 的 Control
        -->
        
        <StackPanel>
        
            <StackPanel.Resources>
                <ControlTemplate x:Key="myButton" TargetType="Button">
                    <Grid>
                        <!--演示 {RelativeSource TemplatedParent} 的 Demo-->
                        <Border x:Name="Background" CornerRadius="3" Background="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                            <Grid Background="{TemplateBinding Background}"  Margin="1">
                                <Border Opacity="0"  x:Name="BackgroundAnimation" Background="#FF448DCA" />
                                <Rectangle x:Name="BackgroundGradient" >
                                    <Rectangle.Fill>
                                        <LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1">
                                            <GradientStop Color="#FFFFFFFF" Offset="0" />
                                            <GradientStop Color="#F9FFFFFF" Offset="0.375" />
                                            <GradientStop Color="#E5FFFFFF" Offset="0.625" />
                                            <GradientStop Color="#C6FFFFFF" Offset="1" />
                                        </LinearGradientBrush>
                                    </Rectangle.Fill>
                                </Rectangle>
                            </Grid>
                        </Border>
                        <ContentPresenter
                              x:Name="contentPresenter"
                              Content="{TemplateBinding Content}"
                              ContentTemplate="{TemplateBinding ContentTemplate}"
                              VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                              HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                              Margin="{TemplateBinding Padding}"/>
                        <Rectangle x:Name="DisabledVisualElement" RadiusX="3" RadiusY="3" Fill="#FFFFFFFF" Opacity="0" IsHitTestVisible="false" />
                        <Rectangle x:Name="FocusVisualElement" RadiusX="2" RadiusY="2" Margin="1" Stroke="#FF6DBDD1" StrokeThickness="1" Opacity="0" IsHitTestVisible="false" />
                    </Grid>
                </ControlTemplate>

            </StackPanel.Resources>

            <!--演示 {RelativeSource Self} 的 Demo-->
            <TextBlock x:Name="lbl" Text="{Binding RelativeSource={RelativeSource Self}, Path=Name}" />
            
            <Button Content="Button" Template="{StaticResource myButton}" Background="Red" />

        </StackPanel>

    </Grid>
</navigation:Page>

3、Runtime 时修改样式的演示
ButtonStyle1.xaml（样式 1）

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
>
    <!--
        自定义 Button 样式 1
    -->
    <Style x:Key="myButton1" TargetType="Button">
        <Setter Property="Foreground" Value="Red"/>
        <Setter Property="Padding" Value="3"/>
        <Setter Property="BorderThickness" Value="3" />
        <Setter Property="BorderBrush" Value="Green" />
    </Style>
</ResourceDictionary>

ButtonStyle2.xaml（样式 2）

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
>
    <!--
        自定义 Button 样式 2
    -->
    <Style x:Key="myButton2" TargetType="Button">
        <Setter Property="Foreground" Value="Blue"/>
        <Setter Property="Padding" Value="3"/>
        <Setter Property="BorderThickness" Value="3" />
        <Setter Property="BorderBrush" Value="Red" />
    </Style>
</ResourceDictionary>

RuntimeChangeStyle.xaml

<navigation:Page x:Class="Silverlight30.Style.RuntimeChangeStyle" 
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="RuntimeChangeStyle Page">
    <Grid x:Name="LayoutRoot">

        <!--
            runtime 时修改样式的 Demo
        -->            
        <StackPanel Orientation="Horizontal">
            <Button x:Name="btn1" Content="Button 样式 1" Click="btn1_Click" Width="160" Height="30" Margin="10" />
            <Button x:Name="btn2" Content="Button 样式 2" Click="btn2_Click" Width="160" Height="30" Margin="10" />
        </StackPanel>
        
    </Grid>
</navigation:Page>

RuntimeChangeStyle.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Navigation;

using System.Xml.Linq;

namespace Silverlight30.Style
{
    public partial class RuntimeChangeStyle : Page
    {
        public RuntimeChangeStyle()
        {
            InitializeComponent();
        }

        private void btn1_Click(object sender, RoutedEventArgs e)
        {
            // 动态设置样式。样式来自于 Style/ButtonStyle1.xaml
            System.Windows.Style style = (System.Windows.Style)Application.Current.Resources["myButton1"];
            btn1.Style = style;
            btn2.Style = style;
        }

        private void btn2_Click(object sender, RoutedEventArgs e)
        {
            // 动态设置样式。样式来自于 Style/ButtonStyle2.xaml
            System.Windows.Style style = (System.Windows.Style)Application.Current.Resources["myButton2"];
            btn1.Style = style;
            btn2.Style = style;
        }
    }
}

4、样式的可继承性的演示
BasedOn.xaml

<navigation:Page x:Class="Silverlight30.Style.BasedOn" 
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="BasedOn Page">
    <Grid x:Name="LayoutRoot">

        <!--
            样式的可继承性（BasedOn）的演示
        -->

        <Grid.Resources>
            <!--基样式-->
            <Style x:Key="baseButton" TargetType="Button">
                <Setter Property="Foreground" Value="Red"/>
                <Setter Property="Padding" Value="3"/>
                <Setter Property="BorderThickness" Value="3" />
                <Setter Property="BorderBrush" Value="Green" />
            </Style>
            
            <!--子样式-->
            <!--BasedOn - 指定当前样式的父样式（此样式会继承指定的父样式）-->
            <Style x:Key="myButton" TargetType="Button" BasedOn="{StaticResource baseButton}">
                <Setter Property="BorderBrush" Value="Red" />
            </Style>
        </Grid.Resources>

        <StackPanel>
            <Button x:Name="btn1" Content="Button 1" Width="120" Height="30" Margin="5"
                Style="{StaticResource baseButton}"  />
            <Button x:Name="btn2" Content="Button 2" Width="120" Height="30" Margin="5"
                Style="{StaticResource myButton}"  />
        </StackPanel>

    </Grid>
</navigation:Page>

5、自定义光标的实现
CaretBrush.xaml

<navigation:Page x:Class="Silverlight30.Style.CaretBrush" 
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="CaretBrush Page">
    <Grid x:Name="LayoutRoot">
        
        <!--
            CaretBrush - 定义输入框的光标的样式
            GradientBrush.MappingMode - 指定渐变点的位置类型 [System.Window.Media.BrushMappingMode 枚举]
                RelativeToBoundingBox - 百分比定位（0,0 - 1,1 之间）
                Absolute - 绝对定位
        -->
    
        <TextBox>
            <TextBox.CaretBrush>
                <LinearGradientBrush MappingMode="RelativeToBoundingBox" StartPoint="0,0" EndPoint="0,1">
                    <LinearGradientBrush.GradientStops>
                        <GradientStop Color="Red" Offset="0.0" />
                        <GradientStop Color="Green" Offset="1.0" />
                    </LinearGradientBrush.GradientStops>
                </LinearGradientBrush>
            </TextBox.CaretBrush>
        </TextBox>
        
    </Grid>
</navigation:Page>

OK
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