Question

我正在尝试使用Canvas

在wpf中移动控件

这是 XAML

    <Canvas Grid.Column="1" Grid.Row="0" x:Name="DropCanvas"   AllowDrop="True"  DragOver="DropCanvas_DragOver" 
            Drop="Canvas_Drop" DragEnter="Canvas_DragEnter" Background="#12000000" >
        <TextBox Canvas.Left="162" Canvas.Top="188" Height="23" Name="textBox1" Width="120"  
                 PreviewMouseMove="textBox1_PreviewMouseMove" 
                 PreviewMouseLeftButtonDown="textBox1_PreviewMouseLeftButtonDown" 
                 PreviewMouseUp="textBox1_PreviewMouseUp" />
    </Canvas>

这是代码

    Point p = new Point();
    private void textBox1_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        Control control = sender as Control;

        control.CaptureMouse();
        p = e.GetPosition(control);   
    }

    private void textBox1_PreviewMouseMove(object sender, MouseEventArgs e)
    {       
            Control control = sender as Control;
            Point x = e.GetPosition(control);
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                Canvas.SetLeft(control, Canvas.GetLeft(control) + (x.X - p.X));
                Canvas.SetTop(control, Canvas.GetTop(control) + (x.Y - p.Y));
            }
            p = x;          
    }

    private void textBox1_PreviewMouseUp(object sender, MouseButtonEventArgs e)
    {
        Control control = sender as Control;
        control.ReleaseMouseCapture();

        activated = false;        
    }

代码正在运行，但当它移动时，控件会抖动。
什么是问题

Answer 1

当您致电GetPosition时，您应该使用DropCanvas作为参数而不是控件。你看到了振动，因为TextBox一直在移动，你需要修复一些东西。

或者，您可以使用Expression Blend SDK中提供的MouseDragElementBehavior来移动容器中的对象。

此外，此项目对您有用：http://www.codeproject.com/Articles/24681/WPF-Diagram-Designer-Part-4

Answer 2

    public void dragme(object sender, MouseButtonEventArgs e)
{
    if (_Move.IsChecked == true)
        db.Attach((DependencyObject)sender);

}

//// MouseDragElementBehavior db;

 private void canvass_PreviewMouseDown(object sender, MouseButtonEventArgs e) 
{
if (_Move.IsChecked == true && filmgrid.Visibility == Visibility.Visible)// == true)  
        {
            filmgrid.PreviewMouseDown += new MouseButtonEventHandler(dragme); 
        }

在wpf中移动任何控件

2 个答案: