Adding accessible context menus to TabView pages #1664
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| using System.Collections; | ||
| using Microsoft.UI.Xaml; | ||
| using Microsoft.UI.Xaml.Controls; | ||
| using Microsoft.UI.Xaml.Media; | ||
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| namespace WinUIGallery.Helpers; | ||
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| public static class TabViewHelper | ||
| { | ||
| public static void PopulateTabViewContextMenu(MenuFlyout contextMenu) | ||
| { | ||
| contextMenu.Items.Clear(); | ||
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| var item = (TabViewItem)contextMenu.Target; | ||
| ListView tabViewListView = null; | ||
| TabView tabView = null; | ||
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| DependencyObject current = item; | ||
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| while (current != null) | ||
| { | ||
| DependencyObject parent = VisualTreeHelper.GetParent(current); | ||
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| if (parent is ListView parentTabViewListView) | ||
| { | ||
| tabViewListView = parentTabViewListView; | ||
| } | ||
| else if (parent is TabView parentTabView) | ||
| { | ||
| tabView = parentTabView; | ||
| } | ||
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| if (tabViewListView != null && tabView != null) | ||
| { | ||
| break; | ||
| } | ||
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| current = parent; | ||
| } | ||
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| if (tabViewListView == null || tabView == null) | ||
| { | ||
| return; | ||
| } | ||
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| // First, if there are tabs to the left or to the right of the tab on which this context menu is opening, | ||
| // then we'll include menu items to move this tab to the left or to the right. | ||
| // | ||
| // There are two possible cases for tab views: either they have explicitly set tab items, or they have a data item source set. | ||
| // To move a tab left or right with explicitly set tab items, we'll remove and replace the tab item itself. | ||
| // To move a tab left or right with a data item source set, we'll instead remove and replace the data item in the source list. | ||
| int index = tabViewListView.IndexFromContainer(item); | ||
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| if (index > 0) | ||
| { | ||
| MenuFlyoutItem moveLeftItem = new() { Text = "Move tab left" }; | ||
| moveLeftItem.Click += (s, args) => | ||
| { | ||
| if (tabView.TabItemsSource is IList itemsSourceList) | ||
| { | ||
| var item = itemsSourceList[index]; | ||
|
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| itemsSourceList.RemoveAt(index); | ||
| itemsSourceList.Insert(index - 1, item); | ||
| } | ||
| else | ||
| { | ||
| var item = tabView.TabItems[index]; | ||
| tabView.TabItems.RemoveAt(index); | ||
| tabView.TabItems.Insert(index - 1, item); | ||
| } | ||
| }; | ||
| contextMenu.Items.Add(moveLeftItem); | ||
| } | ||
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| if (index < tabViewListView.Items.Count - 1) | ||
| { | ||
| MenuFlyoutItem moveRightItem = new() { Text = "Move tab right" }; | ||
| moveRightItem.Click += (s, args) => | ||
| { | ||
| if (tabView.TabItemsSource is IList itemsSourceList) | ||
| { | ||
| var item = itemsSourceList[index]; | ||
| itemsSourceList.RemoveAt(index); | ||
| itemsSourceList.Insert(index + 1, item); | ||
| } | ||
| else | ||
| { | ||
| var item = tabView.TabItems[index]; | ||
| tabView.TabItems.RemoveAt(index); | ||
| tabView.TabItems.Insert(index + 1, item); | ||
| } | ||
| }; | ||
| contextMenu.Items.Add(moveRightItem); | ||
| } | ||
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| // If the context menu ended up with no items at all, then we'll prevent it from being shown. | ||
| if (contextMenu.Items.Count == 0) | ||
| { | ||
| contextMenu.Hide(); | ||
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| } | ||
| } | ||
| } | ||
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Should we check type first before typecasting?