ContextMenu的使用

Posted on 2012-03-27 17:09 work hard work smart 阅读(11557) 评论(0) 编辑收藏举报

ContextMenu的使用

下面代码的效果是右键单击图片时，显示菜单。当单击菜单的某项时，执行相应的命令。

Image.RightTapped += new RightTappedEventHandler(Image_RightTapped);

async void Image_RightTapped(object sender, RightTappedRoutedEventArgs e)
{
    var menu = new PopupMenu();
    menu.Commands.Add(new UICommand("Open with", (command) =>
        {
            Display.Text = "'" + command.Label + "' selected";
        }));
    menu.Commands.Add(new UICommand("Save attachment", (command) =>
    {
        Display.Text = "'" + command.Label + "' selected";
    }));
 
    var chosenCommand = await menu.ShowForSelectionAsync(GetElementRect((FrameworkElement)sender));
    if (chosenCommand == null)
    {
        Display.Text = "Context menu dismissed";
    }
}

Rect GetElementRect(FrameworkElement element)
{
    GeneralTransform buttonTransform = element.TransformToVisual(null);
    Point point = buttonTransform.TransformPoint(new Point());
    return new Rect(point, new Size(element.ActualWidth, element.ActualHeight));
}

　　效果图：

2、文本的ContextMenuOpening事件

Scenario2TextBox.ContextMenuOpening += new ContextMenuOpeningEventHandler(Scenario2TextBox_ContextMenuOpening);

async void Scenario2TextBox_ContextMenuOpening(object sender, ContextMenuEventArgs e)
{
    // Create a menu and add commands specifying an id value for each instead of a delegate.
    var menu = new PopupMenu();
    menu.Commands.Add(new UICommand("Copy", null, 1));
    menu.Commands.Add(new UICommandSeparator());
    menu.Commands.Add(new UICommand("Highlight", null, 2));
    menu.Commands.Add(new UICommand("Look up on dictionary", null, 3));
 
    // We don't want to obscure content, so pass in a rectangle representing the sender of the context menu event.
    // We registered command callbacks; no need to await and handle context menu completion
    var chosenCommand = await menu.ShowForSelectionAsync(GetElementRect((FrameworkElement)sender));
    if (chosenCommand != null)
    {
        switch ((int)chosenCommand.Id)
        {
            case 1:
                Output2Text.Text = "'" + chosenCommand.Label + "'(" + chosenCommand.Id.ToString() + ") selected";
                break;
 
            case 2:
                Output2Text.Text = "'" + chosenCommand.Label + "'(" + chosenCommand.Id.ToString() + ") selected";
                break;
 
            case 3:
                Output2Text.Text = "'" + chosenCommand.Label + "'(" + chosenCommand.Id.ToString() + ") selected";
                break;
        }
    }
    else
    {
        Output2Text.Text = "Context menu dismissed";
    }
}