Metro style App ContextMenu Summary

Metro style App ContextMenu Summary。

Fist let us see the effect pictures。

Picture 1.

Picture 2.

Get the frameworkElement Rect。

        public static 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));
        }

Next is a image righttap event。

        private async void AttachmentImage_RightTapped(object sender, RightTappedRoutedEventArgs e)
        {
            var menu = new PopupMenu();
            menu.Commands.Add(new UICommand("Open with", (command) =>
            {
                //ToDo:function
            }));
            menu.Commands.Add(new UICommand("Save attachment", (command) =>
            {
                //ToDo:function
            }));
  
            var chosenCommand = await menu.ShowForSelectionAsync(GetElementRect((FrameworkElement)sender));
            if (chosenCommand == null) 
            {
                // The command is null if no command was invoked.
                //ToDo：function
            }
        }

 

 2.Another sample

 returns a rect for selected text

        // returns a rect for selected text
        private Rect GetTextboxSelectionRect(TextBox textbox)
        {
            Rect rectFirst, rectLast;
            if (textbox.SelectionStart == textbox.Text.Length)
            {
                rectFirst = textbox.GetRectFromCharacterIndex(textbox.SelectionStart - 1, true);
            }
            else
            {
                rectFirst = textbox.GetRectFromCharacterIndex(textbox.SelectionStart, false);
            }

            int lastIndex = textbox.SelectionStart + textbox.SelectionLength;
            if (lastIndex == textbox.Text.Length)
            {
                rectLast = textbox.GetRectFromCharacterIndex(lastIndex - 1, true);
            }
            else
            {
                rectLast = textbox.GetRectFromCharacterIndex(lastIndex, false);
            }

            GeneralTransform buttonTransform = textbox.TransformToVisual(null);
            Point point = buttonTransform.TransformPoint(new Point());

            return new Rect(point.X + rectFirst.Left,
                point.Y + rectFirst.Top,
                rectLast.Right - rectFirst.Left,
                rectLast.Bottom - rectFirst.Top);
        }

Next is a TextBox ContextMenuOpening event.

        private async void ReadOnlyTextBox_ContextMenuOpening(object sender, ContextMenuEventArgs e)
        {
            e.Handled = true;
            TextBox textbox = (TextBox)sender;
            if (textbox.SelectionLength > 0)
            {
                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", null, 3));

                Rect rect = GetTextboxSelectionRect(textbox);
                var chosenCommand = await menu.ShowForSelectionAsync(rect);
                if (chosenCommand != null)
                {
                    switch ((int)chosenCommand.Id)
                    {
                        case 1:
                            //Next is copy function
                            String selectedText = ((TextBox)sender).SelectedText;
                            var dataPackage = new DataPackage();
                            dataPackage.SetText(selectedText);
                            Clipboard.SetContent(dataPackage); 
                            break;

                        case 2:
                            //Todo:function
                            break;

                        case 3:
                            //Todo:function
                            break;
                    }
                }
                else
                {
                    //Todo:function
                }
            }
            else
            {
                //Todo:function
            }
        }

The source sample is from msdn.