稳扎稳打Silverlight(13) - 2.0交互之鼠标事件和键盘事件

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; 
 
namespace Silverlight20.Interactive 
{ 
         public partial  class Keyboard : UserControl 
        { 
                 public Keyboard() 
                { 
                        InitializeComponent(); 
 
                         this.Loaded +=  new RoutedEventHandler(Keyboard_Loaded); 
 
                         // 为 UserControl 注册 KeyUp 事件 
                        userControl.KeyUp +=  new KeyEventHandler(userControl_KeyUp); 
                } 
 
                 void Keyboard_Loaded( object sender, RoutedEventArgs e) 
                { 
                         // 让 UserControl 获得焦点，这样该 UserControl 内的元素才能监听到键盘事件 
                        userControl.Focus(); 
                } 
 
                 private  void userControl_KeyDown( object sender, KeyEventArgs e) 
                { 
                         // 获取 textBox 对象的相对于 Canvas 的 x坐标 和 y坐标 
                         double x = ( double)textBox.GetValue(Canvas.LeftProperty); 
                         double y = ( double)textBox.GetValue(Canvas.TopProperty); 
 
                         // KeyEventArgs.Key - 与事件相关的键盘的按键 [System.Windows.Input.Key枚举] 
                         switch (e.Key) 
                        { 
                                 // 按 Up 键后 textBox 对象向 上 移动 1 个像素 
                                 // Up 键所对应的 e.PlatformKeyCode == 38    
                                 // 当获得的 e.Key == Key.Unknown 时，可以使用 e.PlatformKeyCode 来确定用户所按的键 
                                 case Key.Up: 
                                        textBox.SetValue(Canvas.TopProperty, y - 1); 
                                         break; 
 
                                 // 按 Down 键后 textBox 对象向 下 移动 1 个像素 
                                 // Down 键所对应的 e.PlatformKeyCode == 40 
                                 case Key.Down: 
                                        textBox.SetValue(Canvas.TopProperty, y + 1); 
                                         break; 
 
                                 // 按 Left 键后 textBox 对象向 左 移动 1 个像素 
                                 // Left 键所对应的 e.PlatformKeyCode == 37 
                                 case Key.Left: 
                                        textBox.SetValue(Canvas.LeftProperty, x - 1); 
                                         break; 
 
                                 // 按 Right 键后 textBox 对象向 右 移动 1 个像素 
                                 // Right 键所对应的 e.PlatformKeyCode == 39    
                                 case Key.Right: 
                                        textBox.SetValue(Canvas.LeftProperty, x + 1); 
                                         break; 
 
                                 default: 
                                         break; 
                        } 
 
                         // 同上：Key.W - 向上移动； Key.S - 向下移动； Key.A - 向左移动； Key.D - 向右移动 
                         switch (e.Key) 
                        { 
                                 // KeyEventArgs.Handled - 是否处理过此事件 
 
                                 // 如果在文本框内敲 W ，那么文本框会向上移动，而且文本框内也会被输入 W 
                                 // 如果只想移动文本框，而不输入 W ，那么可以设置 KeyEventArgs.Handled = true 告知此事件已经被处理完毕 
                                 case Key.W: 
                                        textBox.SetValue(Canvas.TopProperty, y - 1); 
                                        e.Handled =  true; 
                                         break; 
                                 case Key.S: 
                                        textBox.SetValue(Canvas.TopProperty, y + 1); 
                                        e.Handled =  true; 
                                         break; 
                                 case Key.A: 
                                        textBox.SetValue(Canvas.LeftProperty, x - 1); 
                                        e.Handled =  true; 
                                         break; 
                                 case Key.D: 
                                        textBox.SetValue(Canvas.LeftProperty, x + 1); 
                                        e.Handled =  true; 
                                         break; 
                                 default: 
                                         break; 
                        } 
                } 
 
                 private  void userControl_KeyUp( object sender, KeyEventArgs e) 
                { 
                         /* 
                        System.Windows.Input.Keyboard.Modifiers - 当前按下的辅助键 [System.Windows.Input.ModifierKeys枚举] 
                                ModifierKeys.None - 无 
                                ModifierKeys.Alt - Alt 键 
                                ModifierKeys.Control - Ctrl 键 
                                ModifierKeys.Shift - Shift 键 
                                ModifierKeys.Windows - Windows 键 
                                ModifierKeys.Apple - Apple 键（苹果电脑） 
                        */ 
 
                         // 按 Ctrl + M 则将 textBox 的位置设置为其初始位置 
                         if (System.Windows.Input.Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.M) 
                        { 
                                textBox.SetValue(Canvas.LeftProperty, 0d); 
                                textBox.SetValue(Canvas.TopProperty, 0d); 
                        } 
                } 
        } 
}