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一步一步学Silverlight 2系列（6）：键盘事件处理

Posted 周六, 03/08/2008 - 19:19 by Anonymous

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》文章带您快速进入Silverlight 2开发。

本文为系列文章第六篇，介绍Silverlight中的键盘处理事件，在Silverlight 2中，支持KeyDown和KeyUp两个事件。

声明事件

所有的事件声明过程都是一样的，在XAML中或者是在代码中进行注册。

<Canvas x:Name="LayoutRoot" Background="#46461F">
    <Ellipse x:Name="ellipse" Width="120" Height="120" Fill="Orange"
             Canvas.Top="50" Canvas.Left="160"
             Stroke="White" StrokeThickness="2"
             KeyUp="ellipse_KeyUp"
             KeyDown="ellipse_KeyDown"/>
</Canvas>

或者在代码中注册：

public partial class Page : UserControl
{
    public Page()
    {
        InitializeComponent();
        this.ellipse.KeyUp += new KeyEventHandler(ellipse_KeyUp);
        this.ellipse.KeyDown += new KeyEventHandler(ellipse_KeyDown);
    }

    private void ellipse_KeyUp(object sender, KeyEventArgs e)
    {

    }

    private void ellipse_KeyDown(object sender, KeyEventArgs e)
    {

    }
}

使用事件参数KeyEventArgs

使用事件参数可以获取到事件数据，可以使用的属性有Key、PlatformKeyCode、Handled、Source。

private void ellipse_KeyUp(object sender, KeyEventArgs e)
{
    if (e.Key == Key.R)
    {
        //......
    }
    else if(e.Key == Key.Ctrl && e.Key == Key.U)
    { 
        //......
    }
}

在事件数据中，Handled有时候非常有用，可以用来判断事件是否已经处理。

键盘路由事件

键盘事件KeyDown和KeyUp都支持路由事件，如下面的示例。

<Canvas x:Name="LayoutRoot" Background="#46461F" KeyUp="LayoutRoot_KeyUp">
    <TextBox x:Name="textbox" Width="200" Height="40"
             Canvas.Top="80" Canvas.Left="80"/>
    <Button x:Name="button" Width="100" Height="40"
             Canvas.Top="80" Canvas.Left="280"
             Background="Red" Margin="20 0 0 0" Content="Submit"/>
    <TextBlock x:Name="Status" Foreground="White"  Text="Status"
                   Canvas.Left="80" Canvas.Top="200"/>
</Canvas>

为Canvas注册了一个KeyUp事件，编写事件处理程序。

private void LayoutRoot_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key != Key.Unknown)
    {
        String msg = "The key " + e.Key.ToString();
        msg += " was pressed while focus was on " + (e.Source as FrameworkElement).Name;
        statusTextBlock.Text = msg;
    }
}

运行程序，当文本框获得焦点并输入t时

TerryLee_Silverlight2_0037

按钮获得焦点

TerryLee_Silverlight2_0038

结束语

关于键盘事件都简单的介绍到这儿，希望对大家有用。

Your rating: None Average: 5 (1 vote)

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by alexlee - 07/01/2010 - 21:48

我用的事Silverlight3
学习这个的时候碰到一个问题
keyEvent 声明给 canvas元素正常执行
但是声明给ellipse元素就不执行
请教为什么