WPF實現控件拖動
阿新 • • 發佈:2019-01-16
實現 原創 mmap markdown and highlight -o event -s 原文:WPF實現控件拖動
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實現控件拖動的基本原理是對鼠標位置的捕獲,同時根據鼠標按鍵的按下、釋放確定控件移動的幅度和時機。
簡單示例:
在Grid中有一個Button,通過鼠標事件改編Button的Margin屬性,從而改變Button在Grid中的相對位置。
<Grid Name="gd">
<Button Width=90 Height=30 Name="btn">button</Button>
</Grid>
為Button控件綁定三個事件:鼠標按下、鼠標移動、鼠標釋放
public SystemMap() { InitializeComponent(); btn.MouseLeftButtonDown += btn_MouseLeftButtonDown; btn.MouseMove += btn_MouseMove; btn.MouseLeftButtonUp += btn_MouseLeftButtonUp; }
定義變量+鼠標按下事件
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;
}
鼠標移動事件
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);
}
}
鼠標釋放事件
void btn_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
Button tmp = (Button)sender;
tmp.ReleaseMouseCapture();
}
WPF實現控件拖動