Question

在WinRT应用程序中，当您右键单击ListBoxItem时，将显示AppBar。但是，当您右键单击GridViewItem时，AppBar不会出现。这可以配置吗？

如果不是更好地使用ListBox而不是GridView并自定义模板。或者我应该使用RightTapped命令实现它。（我使用MVVM Light，因为Caliburn.Micro目前无法正常工作）

RightTappedCommand示例：



 public sealed class RightTapped
    {
        #region Properties

        #region Command

        /// 
        /// GetCommand
        /// 
        /// 
        /// 
        public static ICommand GetCommand(DependencyObject obj)
        {
            return (ICommand)obj.GetValue(CommandProperty);
        }

        /// 
        /// SetCommand
        /// 
        /// 
        /// 
        public static void SetCommand(DependencyObject obj, ICommand value)
        {
            obj.SetValue(CommandProperty, value);
        }

        /// 
        /// DependencyProperty CommandProperty
        /// 
        public static readonly DependencyProperty CommandProperty =
            DependencyProperty.RegisterAttached("Command", typeof(ICommand), typeof(RightTapped), new PropertyMetadata(null, OnCommandChanged));

        #endregion Command

        #region CommandParameter

        /// 
        /// GetCommandParameter
        /// 
        /// 
        /// 
        public static object GetCommandParameter(DependencyObject obj)
        {
            return (object)obj.GetValue(CommandParameterProperty);
        }

        /// 
        /// SetCommandParameter
        /// 
        /// 
        /// 
        public static void SetCommandParameter(DependencyObject obj, object value)
        {
            obj.SetValue(CommandParameterProperty, value);
        }

        /// 
        /// DependencyProperty CommandParameterProperty
        /// 
        public static readonly DependencyProperty CommandParameterProperty =
            DependencyProperty.RegisterAttached("CommandParameter", typeof(object), typeof(RightTapped), new PropertyMetadata(null, OnCommandParameterChanged));

        #endregion CommandParameter

        #region HasCommandParameter

        private static bool GetHasCommandParameter(DependencyObject obj)
        {
            return (bool)obj.GetValue(HasCommandParameterProperty);
        }

        private static void SetHasCommandParameter(DependencyObject obj, bool value)
        {
            obj.SetValue(HasCommandParameterProperty, value);
        }

        private static readonly DependencyProperty HasCommandParameterProperty =
            DependencyProperty.RegisterAttached("HasCommandParameter", typeof(bool), typeof(RightTapped), new PropertyMetadata(false));

        #endregion HasCommandParameter

        #endregion Propreties

        #region Event Handling

        private static void OnCommandParameterChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            SetHasCommandParameter(o, true);
        }

        private static void OnCommandChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            var element = o as FrameworkElement;
            if (element != null)
            {
                if (e.NewValue == null)
                {
                    element.RightTapped -= FrameworkElementKeyUp;
                }
                else if (e.OldValue == null)
                {
                    element.RightTapped += FrameworkElementKeyUp;
                }
            }
        }

        private static void FrameworkElementKeyUp(object sender, RightTappedRoutedEventArgs e)
        {
            var o = sender as DependencyObject;
            var command = GetCommand(sender as DependencyObject);

            var element = e.OriginalSource as FrameworkElement;
            if (element != null)
            {
                // If the command argument has been explicitly set (even to NULL) 
                if (GetHasCommandParameter(o))
                {
                    var commandParameter = GetCommandParameter(o);

                    // Execute the command 
                    if (command.CanExecute(commandParameter))
                    {
                        command.Execute(commandParameter);
                    }
                }
                else if (command.CanExecute(element.DataContext))
                {
                    command.Execute(element.DataContext);
                }
            }
        }

        #endregion
    }

在Xaml中，类似这样：

common:Tapped.Command="{Binding ShowAppBar}"

Answer 1

你可以做myAppBar.IsOpen = true。

Answer 2

取决于gridview选择模式，右键单击用于选择项目。如果将selectionmode属性设置为None，则右键单击将打开appbar。

右键单击GridView项目显示AppBar

2 个答案: