WPF下实现控件的拖动操作

最新推荐文章于 2025-05-30 11:45:12 发布

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本文介绍了一个使用WPF实现的简单控件拖动功能。通过XAML定义界面，并利用C#代码处理鼠标事件，实现了Label控件在Canvas画布上的拖拽移动。

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XAML:

<Window x:Class="WPFWin.Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Window1" Height="381" Width="662" MouseMove="Window_MouseMove" MouseUp="Window_MouseUp">

<Label Canvas.Left="127" Canvas.Top="141" Height="28" Name="label1" Width="120" MouseDown="label1_MouseDown" >拖动这个控件</Label>

</Canvas>

</Window>

C#:
        bool IsMouseDown = false;
        Point mousePoint;
        object mouseCtrl = null;

        private void label1_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                IsMouseDown = true;
                mousePoint = e.GetPosition(this.canvas1);
                mouseCtrl = sender;
            }
        }

        private void Window_MouseMove(object sender, MouseEventArgs e)
        {
            if (IsMouseDown)
            {
                if (e.LeftButton == MouseButtonState.Pressed)
                {
                    Point theMousePoint = e.GetPosition(this.canvas1 );
                    Canvas.SetLeft((UIElement)mouseCtrl, theMousePoint.X - (mousePoint.X - Canvas.GetLeft(((UIElement)mouseCtrl))));
                    Canvas.SetTop((UIElement)mouseCtrl, theMousePoint.Y - (mousePoint.Y - Canvas.GetTop(((UIElement)mouseCtrl))));

                    mousePoint = theMousePoint;
                }
            }
        }

        private void Window_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (IsMouseDown)
            {
                IsMouseDown = false;
            }
        }