Silverlight学習ノート(7)---Silverlightイベント処理のマウスイベントを簡単にドラッグ&ドロップ

XAML:矩形rectangleのみが定義されており、処理するイベントはマウスを押す(左クリック)、マウスを移動し、左クリックして弾きます.

 1 <UserControl x:Class="Event.MainPage"
 2     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 5     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 6     mc:Ignorable="d"
 7     d:DesignHeight="300" d:DesignWidth="400">
 8 
 9     <Canvas x:Name="LayoutRoot" Width="640" Height="360" Background="BlueViolet">
10         <Rectangle x:Name="rect" Width="50" Height="50" Fill="Red"
11                    MouseLeftButtonDown="rect_MouseLeftButtonDown"
12                    MouseMove="rect_MouseMove"
13                    MouseLeftButtonUp="rect_MouseLeftButtonUp"></Rectangle>
14     </Canvas>
15 </UserControl>

C#:コメント

 1 public partial class MainPage : UserControl
 2     {
 3         public MainPage()
 4         {
 5             InitializeComponent();
 6         }
 7 
 8         bool isMouseCaptured;//      
 9         double posV;
10         double posH;
11 
12         private void rect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
13         {
14             Rectangle rect = sender as Rectangle;
15             //       position
16             posH = e.GetPosition(null).X;
17             posV = e.GetPosition(null).Y;
18             isMouseCaptured = true;
19             rect.CaptureMouse();//  
20         }
21 
22         private void rect_MouseMove(object sender, MouseEventArgs e)
23         {
24             Rectangle rect = sender as Rectangle;
25             if (isMouseCaptured)
26             {
27                 //       
28                 double detalH = e.GetPosition(null).X - posH;
29                 double detalV = e.GetPosition(null).Y - posV;
30                 //    
31                 double newH = detalH + (double)rect.GetValue(Canvas.LeftProperty);
32                 double newV = detalV + (double)rect.GetValue(Canvas.TopProperty);
33                 //       
34                 rect.SetValue(Canvas.TopProperty, newV);
35                 rect.SetValue(Canvas.LeftProperty, newH);
36                 //     position  
37                 posH = e.GetPosition(null).X;
38                 posV = e.GetPosition(null).Y;
39             }
40             else { }
41         }
42 
43         private void rect_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
44         {
45             Rectangle rect = sender as Rectangle;
46             //    
47             isMouseCaptured = false;
48             rect.ReleaseMouseCapture();
49             posH = -1;
50             posV = -1;
51         }
52     }

効果図:ダイナミックマップなし
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