WPF实现鼠标拖动框选功能

本实例主要是使用WPF实现拖动鼠标画出矩形框同时框选控件的功能，效果如下：

1、首先Canvas里放一些矩形控件来做示例，添加鼠标按下、抬起、移动事件

<Window x:Class="MouseBoxSelection.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:MouseBoxSelection"mc:Ignorable="d"Title="MainWindow" Height="250" Width="500"  ><Canvas x:Name="mainCanvas" Background="LightGray" MouseMove="MainCanvas_MouseMove" MouseLeftButtonUp="MainCanvas_MouseLeftButtonUp" MouseLeftButtonDown="MainCanvas_MouseLeftButtonDown"><Rectangle Width="25" Height="25" Canvas.Left="100" Canvas.Top="50" Fill="Red"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="150" Canvas.Top="50" Fill="Blue"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="200" Canvas.Top="50" Fill="Red"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="250" Canvas.Top="50" Fill="Blue"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="300" Canvas.Top="50" Fill="Red"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="350" Canvas.Top="50" Fill="Blue"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="100" Canvas.Top="100" Fill="Red"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="150" Canvas.Top="100" Fill="Blue"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="200" Canvas.Top="100" Fill="Red"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="250" Canvas.Top="100" Fill="Blue"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="300" Canvas.Top="100" Fill="Red"></Rectangle><Rectangle Width="25" Height="25" Canvas.Left="350" Canvas.Top="100" Fill="Blue"></Rectangle><Button x:Name="ReSet" Content="恢复" Width="80" Height="30" Canvas.Right="30" Canvas.Bottom="30" Cursor="Hand" Click="ReSet_Click"></Button></Canvas>
</Window>

2、添加全局变量

        private Border currentBoxSelectedBorder = null;//拖动展示的提示框private bool isCanMove = false;//鼠标是否移动private Point tempStartPoint;//起始坐标

3、实现鼠标按下记录起始点，拖动绘制选框，抬起选中逻辑

        /// <summary>/// 鼠标按下记录起始点/// </summary>private void MainCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e){isCanMove = true;tempStartPoint = e.GetPosition(this.mainCanvas);}/// <summary>/// 框选逻辑/// </summary>private void MainCanvas_MouseMove(object sender, MouseEventArgs e){if(isCanMove){Point tempEndPoint = e.GetPosition(this.mainCanvas);//绘制跟随鼠标移动的方框DrawMultiselectBorder(tempEndPoint, tempStartPoint);}}/// <summary>/// 鼠标抬起时清除选框/// </summary>private void MainCanvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e){if (currentBoxSelectedBorder != null){//获取选框的矩形位置Point tempEndPoint = e.GetPosition(this.mainCanvas);Rect tempRect = new Rect(tempStartPoint, tempEndPoint);//获取子控件List<Rectangle> childList = GetChildObjects<Rectangle>(this.mainCanvas);foreach (var child in childList){//获取子控件矩形位置Rect childRect = new Rect(Canvas.GetLeft(child), Canvas.GetTop(child), child.Width, child.Height);//若子控件与选框相交则改变样式if (childRect.IntersectsWith(tempRect))child.Opacity = 0.4;}this.mainCanvas.Children.Remove(currentBoxSelectedBorder);currentBoxSelectedBorder = null;}isCanMove = false;}/// <summary>/// 绘制跟随鼠标移动的方框/// </summary>private void DrawMultiselectBorder(Point endPoint, Point startPoint){if (currentBoxSelectedBorder == null){currentBoxSelectedBorder = new Border();currentBoxSelectedBorder.Background = new SolidColorBrush(Colors.Orange);currentBoxSelectedBorder.Opacity = 0.4;currentBoxSelectedBorder.BorderThickness = new Thickness(2);currentBoxSelectedBorder.BorderBrush = new SolidColorBrush(Colors.OrangeRed);Canvas.SetZIndex(currentBoxSelectedBorder, 100);this.mainCanvas.Children.Add(currentBoxSelectedBorder);}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);elseCanvas.SetLeft(currentBoxSelectedBorder, endPoint.X);if (endPoint.Y - startPoint.Y >= 0)Canvas.SetTop(currentBoxSelectedBorder, startPoint.Y);elseCanvas.SetTop(currentBoxSelectedBorder, endPoint.Y);}/// <summary>/// 获得所有子控件/// </summary>public static List<T> GetChildObjects<T>(System.Windows.DependencyObject obj) where T : System.Windows.FrameworkElement{System.Windows.DependencyObject child = null;List<T> childList = new List<T>();for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++){child = VisualTreeHelper.GetChild(obj, i);if (child is T){childList.Add((T)child);}childList.AddRange(GetChildObjects<T>(child));}return childList;}/// <summary>/// 恢复原来状态/// </summary>private void ReSet_Click(object sender, RoutedEventArgs e){List<Rectangle> childList = GetChildObjects<Rectangle>(this.mainCanvas);foreach (var child in childList){if (child.Opacity != 1)child.Opacity = 1;}}

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