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MVVM中如何绑定鼠标双击命令
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mvvm
、
viewmodel
特殊枪的潘鬼鬼
前端开发
可以这样: namespace Behavior { public class MouseDoubleClick { public static DependencyProperty CommandProperty = DependencyProperty.RegisterAttached("Command", typeof(ICommand), typeof(MouseDoubleClick), new UIPropertyMetadata(CommandChanged)); public static DependencyProperty CommandParameterProperty = DependencyProperty.RegisterAttached("CommandParameter", typeof(object), typeof(MouseDoubleClick), new UIPropertyMetadata(null)); public static void SetCommand(DependencyObject target, ICommand value) { target.SetValue(CommandProperty, value); } public static void SetCommandParameter(DependencyObject target, object value) { target.SetValue(CommandParameterProperty, value); } public static object GetCommandParameter(DependencyObject target) { return target.GetValue(CommandParameterProperty); } private static void CommandChanged(DependencyObject target, DependencyPropertyChangedEventArgs e) { Control control = target as Control; if (control != null) { if ((e.NewValue != null) && (e.OldValue == null)) { control.MouseDoubleClick += OnMouseDoubleClick; } else if ((e.NewValue == null) && (e.OldValue != null)) { control.MouseDoubleClick -= OnMouseDoubleClick; } } } private static void OnMouseDoubleClick(object sender, RoutedEventArgs e) { Control control = sender as Control; ICommand command = (ICommand)control.GetValue(CommandProperty); object commandParameter = control.GetValue(CommandParameterProperty); command.Execute(commandParameter); } } } 在XAML中: <ListBox Behavior:MouseDoubleClick.Command="{Binding ....}" Behavior:MouseDoubleClick.CommandParameter="{Binding ....}"/>...
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可以这样: namespace Behavior { public class MouseDoubleClick { public static DependencyProperty CommandProperty = DependencyProperty.RegisterAttached("Command", typeof(ICommand), typeof(MouseDoubleClick), new UIPropertyMetadata(CommandChanged)); public static DependencyProperty CommandParameterProperty = DependencyProperty.RegisterAttached("CommandParameter", typeof(object), typeof(MouseDoubleClick), new UIPropertyMetadata(null)); public static void SetCommand(DependencyObject target, ICommand value) { target.SetValue(CommandProperty, value); } public static void SetCommandParameter(DependencyObject target, object value) { target.SetValue(CommandParameterProperty, value); } public static object GetCommandParameter(DependencyObject target) { return target.GetValue(CommandParameterProperty); } private static void CommandChanged(DependencyObject target, DependencyPropertyChangedEventArgs e) { Control control = target as Control; if (control != null) { if ((e.NewValue != null) && (e.OldValue == null)) { control.MouseDoubleClick += OnMouseDoubleClick; } else if ((e.NewValue == null) && (e.OldValue != null)) { control.MouseDoubleClick -= OnMouseDoubleClick; } } } private static void OnMouseDoubleClick(object sender, RoutedEventArgs e) { Control control = sender as Control; ICommand command = (ICommand)control.GetValue(CommandProperty); object commandParameter = control.GetValue(CommandParameterProperty); command.Execute(commandParameter); } } } 在XAML中: <ListBox Behavior:MouseDoubleClick.Command="{Binding ....}" Behavior:MouseDoubleClick.CommandParameter="{Binding ....}"/>
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