WPF实现控件拖动的示例代码
时间:2020-11-19 17:57:36|栏目:.NET代码|点击: 次
实现控件拖动的基本原理是对鼠标位置的捕获,同时根据鼠标按键的按下、释放确定控件移动的幅度和时机。
简单示例:
在Grid中有一个Button,通过鼠标事件改编Button的Margin属性,从而改变Button在Grid中的相对位置。
<Grid Name="gd"> <Button Width=90 Height=30 Name="btn">button</Button> </Grid>
为Button控件绑定三个事件:鼠标按下、鼠标移动、鼠标释放
public SystemMap() { InitializeComponent(); btn.MouseLeftButtonDown += btn_MouseLeftButtonDown; btn.MouseMove += btn_MouseMove; btn.MouseLeftButtonUp += btn_MouseLeftButtonUp; }
定义变量+鼠标按下事件
Point pos = new Point(); void btn_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { Button tmp = (Button)sender; pos = e.GetPosition(null); tmp.CaptureMouse(); tmp.Cursor = Cursors.Hand; }
鼠标移动事件
void btn_MouseMove(object sender, MouseEventArgs e) { if (e.LeftButton==MouseButtonState.Pressed) { Button tmp = (Button)sender; double dx = e.GetPosition(null).X - pos.X + tmp.Margin.Left; double dy = e.GetPosition(null).Y - pos.Y + tmp.Margin.Top; tmp.Margin = new Thickness(dx, dy, 0, 0); pos = e.GetPosition(null); } }
鼠标释放事件
void btn_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { Button tmp = (Button)sender; tmp.ReleaseMouseCapture(); }