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【CSharp】 C#可移动按钮“相关代码”
作者:asion / 发布于2011/4/26/ 967
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            <td class="content">"csharp plain">Point mouse_offset;</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">private</font></strong> "csharp keyword"><strong><font color="#006699">void</font></strong> "csharp plain">Button_MouseDown("csharp keyword"><strong><font color="#006699">object</font></strong> "csharp plain">sender , MouseEventArgs e)</td>
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            <td class="content">"csharp plain">{</td>
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            <td class="content">"csharp plain">mouse_offset = e.Location; "csharp comments"><font color="#008200">//将当前鼠标相对于&ldquo;窗体&rdquo;左上角的坐标赋值给mouse_offset</font></td>
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            <td class="content">"csharp plain">}</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">private</font></strong> "csharp keyword"><strong><font color="#006699">void</font></strong> "csharp plain">Button_MouseMove("csharp keyword"><strong><font color="#006699">object</font></strong> "csharp plain">sender , MouseEventArgs e)</td>
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            <td class="content">"csharp plain">{</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">if</font></strong> "csharp plain">( e.Button == MouseButtons.Left )</td>
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            <td class="content">"csharp plain">{</td>
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            <td class="content">"csharp comments"><font color="#008200">//将相对屏幕坐标转换为相对工作区的坐标。</font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">left = PointToClient(Control.MousePosition).X - mouse_offset.X;</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">top = PointToClient(Control.MousePosition).Y - mouse_offset.Y;</td>
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            <td class="content">"csharp comments"><font color="#008200">//左右可能越界</font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">if</font></strong>"csharp plain">(left<0)</td>
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            <td class="content">"csharp plain">left=0;</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">if</font></strong> "csharp plain">( left > "csharp keyword"><strong><font color="#006699">this</font></strong>"csharp plain">.Width )</td>
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            <td class="content">"csharp plain">left = "csharp keyword"><strong><font color="#006699">this</font></strong>"csharp plain">.Width - ( (Button)sender ).Width;</td>
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            <td class="content">"csharp comments"><font color="#008200">//上下可能越界</font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">if</font></strong> "csharp plain">( top < 0 )</td>
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            <td class="content">"csharp plain">top = 0;</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">if</font></strong> "csharp plain">( top > "csharp keyword"><strong><font color="#006699">this</font></strong>"csharp plain">.Height )</td>
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            <td class="content">"csharp plain">top = "csharp keyword"><strong><font color="#006699">this</font></strong>"csharp plain">.Height - ( (Button)sender ).Height;</td>
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            <td class="content">"csharp plain">( (Button)sender ).Left = left;</td>
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            <td class="content">"csharp plain">( (Button)sender ).Top = top;</td>
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            <td class="content">"csharp plain">}</td>
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            <td class="content">"csharp plain">}</td>
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