WPF實現滑鼠拖動框選功能

本例項主要是使用wpf實現拖動滑鼠畫出矩形框同時框選控制項的功能，效果如下：

1、首先canvas裡放一些矩形控制項來做示例，新增滑鼠按下、抬起、移動事件

private border currentboxselectedborder = null;//拖動展示的提示框

private bool iscanmove = false;//滑鼠是否移動
private point tempstartpoint;//起始座標

/// /// 滑鼠按下記錄起始點

/// 
private void maincanvas_mouseleftbuttondown(object sender, mousebuttoneventargs e)
/// /// 框選邏輯
/// 
private void maincanvas_mousemove(object sender, mouseeventargs e)
}/// /// 滑鼠抬起時清除選框
/// 
private void maincanvas_mouseleftbuttonup(object sender, mousebuttoneventargs e)
this.maincanvas.children.remove(currentboxselectedborder);
currentboxselectedborder = null;
}iscanmove = false;
}/// /// 繪製跟隨滑鼠移動的方框
/// 
private void drawmultiselectborder(point endpoint, point startpoint)
currentboxselectedborder.width = math.abs(endpoint.x - startpoint.x);
currentboxselectedborder.height = math.abs(endpoint.y - startpoint.y);
if (endpoint.x - startpoint.x >= 0)
canvas.setleft(currentboxselectedborder, startpoint.x);
else
canvas.setleft(currentboxselectedborder, endpoint.x);
if (endpoint.y - startpoint.y >= 0)
canvas.settop(currentboxselectedborder, startpoint.y);
else
canvas.settop(currentboxselectedborder, endpoint.y);
}/// /// 獲得所有子控制項
/// 
public static listgetchildobjects(system.windows.dependencyobject obj) where t : system.windows.frameworkelement
childlist.addrange(getchildobjects(child));
}return childlist;
}/// /// 恢復原來狀態
/// 
private void reset_click(object sender, routedeventargs e)
}

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