1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 using System.Windows; 7 using System.Windows.Controls; 8 using System.Windows.Data; 9 using System.Windows.Documents;10 using System.Windows.Input;11 using System.Windows.Media;12 using System.Windows.Media.Imaging;13 using System.Windows.Navigation;14 using System.Windows.Shapes;15 16 namespace WpfApplication117 {18     /// 
19     /// MainWindow.xaml 的交互逻辑20     /// 
21     public partial class MainWindow : Window22     {23         public MainWindow()24         {25             InitializeComponent();26             Binding binding = new Binding();27             binding.Source = main_grid;28             binding.Path = new PropertyPath("Margin");29             binding.Mode = BindingMode.TwoWay;30             binding.Converter = new MarginConverter();31             binding.ConverterParameter = main_grid.Width;32             sub_grid.SetBinding(Grid.MarginProperty, binding);33         }34 35         public class MarginConverter : IValueConverter36         {37 38             public object Convert(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)39             {40                 Thickness margin = (Thickness)value;41                 double width = (double)parameter;42                 return new Thickness(margin.Left + width, margin.Top -30, 0, 0);43             }44 45             public object ConvertBack(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)46             {47                 Thickness margin = (Thickness)value;48                 double width = (double)parameter;49                 return new Thickness(margin.Left - width, margin.Top + 30, 0, 0);50             }51         }52 53         //选中控件的鼠标位置偏移量54         Point targetPoint;55 56         private void canvas_MouseDown(object sender, MouseButtonEventArgs e)57         {58             var targetElement = e.Source as IInputElement;59             if (targetElement != null)60             {61                 targetPoint = e.GetPosition(targetElement);62                 //开始捕获鼠标63                 targetElement.CaptureMouse();64             }65         }66 67         private void canvas_MouseUp(object sender, MouseButtonEventArgs e)68         {69             //取消捕获鼠标70             Mouse.Capture(null);71         }72 73         private void canvas_MouseMove(object sender, MouseEventArgs e)74         {75             //确定鼠标左键处于按下状态并且有元素被选中76             var targetElement = Mouse.Captured as Grid;77             if (e.LeftButton == MouseButtonState.Pressed && targetElement != null)78             {79                 var pCanvas = e.GetPosition(canvas);80                 //设置最终位置81                 targetElement.Margin = new Thickness(pCanvas.X - targetPoint.X, pCanvas.Y - targetPoint.Y, 0, 0);82             }83         }84     }85 }

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