> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/xamarin/ui-customization/list-container.md).

# List Container

Learn how to customize horizontal menu layout in Xamarin.Android using the list container UI component. Display annotation, outline, and bookmark lists in separate tabs with BookmarksDialogFragment. T

The list container is a UI component that contains other components related to annotations and bookmarks.

{% tabs %}
{% tab title="Android" %}

## List container to customize horizontal menu layout in Xamarin.Android

{% hint style="info" %}
**This tutorial only applies to Xamarin.Android. See Xamarin.iOS equivalent here .**
{% endhint %}

The list container provides a horizontal layout to display the following items in separate tabs:

* [Annotation list](/xamarin/annotation/annotation-list.md#android)
* [Document outline](/xamarin/guides/android/bookmark/outline.md#ui-component)
* [User-defined bookmark list](/xamarin/bookmarks/user-bookmarks.md#android)

![](https://653871032-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgjsBtuYmcKhWOdM9VCg4%2Fuploads%2Fgit-blob-3769c92bdcad1d5b53edbb5cd4dc409efcd4329a%2F408eaa5f033c0bd4620b5e20efcea346589a7c84-600x1200.gif?alt=media)

## Show list container

The list container is implemented by the `BookmarksDialogFragment` class. To show this fragment in your activity, create a new instance of `BookmarksDialogFragment` by calling `newInstance()`. Afterwards, initialize your fragment by setting the [`PDFViewCtrl`](https://sdk.apryse.com/api/xamarinandroid/pdfnet/api/pdftron.PDF.PDFViewCtrl.html) and an `ArrayList` of `DialogFragmentTab`:

{% code lineNumbers="true" %}

```csharp
private PDFViewCtrl mPdfViewCtrl;
// ...
public void ShowBookmarksDialog(List<DialogFragmentTab> dialogFragmentTabs,
                                FragmentManager fragmentManager) {
    var fragment = BookmarksDialogFragment.NewInstance();
    fragment.SetPdfViewCtrl(mPdfViewCtrl)
            .SetDialogFragmentTabs(dialogFragmentTabs);
    // Set a custom style for this fragment
    fragment.SetStyle((int)DialogFragmentStyle.NoTitle, Resource.Style.PDFTronAppTheme);
    // Show the dialog
    fragment.Show(fragmentManager, "bookmarks_dialog");
}
```

{% endcode %}

`DialogFragmentTab` specifies the information about each tab including the type of class and the tab tag. Currently the following dialogs can be displayed within the bookmarks dialog:

| Dialog             | Type of class                    | Tab tag              |
| ------------------ | -------------------------------- | -------------------- |
| Annotation list    | AnnotationDialogFragment.class   | TAG\_TAB\_ANNOTATION |
| Document outline   | OutlineDialogFragment.class      | TAG\_TAB\_OUTLINE    |
| User bookmark list | UserBookmarkDialogFragment.class | TAG\_TAB\_BOOKMARK   |

The following example shows how to display an annotations list, a document outline, and a user-defined bookmark list tabs in `BookmarksDialogFragment`:

{% code lineNumbers="true" %}

```csharp
using pdftron.PDF.Tools.Utils;

var bookmarksDialog = pdftron.PDF.Dialog.BookmarksDialogFragment.NewInstance();
bookmarksDialog.SetPdfViewCtrl(mPdfViewCtrl);
List<DialogFragmentTab> tabs = new List<DialogFragmentTab>();
var annotationsTab = new DialogFragmentTab(
    Java.Lang.Class.FromType(typeof(AnnotationDialogFragment)), BookmarksTabLayout.TagTabAnnotation, null, "Annotations", "Bookmarks Dialog", null);
var outlineDialog = new DialogFragmentTab(
    Java.Lang.Class.FromType(typeof(OutlineDialogFragment)), BookmarksTabLayout.TagTabOutline, null, "Outline", "Bookmarks Dialog", null);
var userBookmarksDialog = new DialogFragmentTab(
    Java.Lang.Class.FromType(typeof(UserBookmarkDialogFragment)), BookmarksTabLayout.TagTabBookmark, null, "User Bookmarks", "Bookmarks Dialog", null);
tabs.Add(annotationsTab);
tabs.Add(outlineDialog);
tabs.Add(userBookmarksDialog);
bookmarksDialog.SetDialogFragmentTabs(tabs);
bookmarksDialog.SetStyle((int)DialogFragmentStyle.NoTitle, Resource.Style.PDFTronAppTheme);
bookmarksDialog.Show(this.SupportFragmentManager, "bookmarks_dialog");
bookmarksDialog.AnnotationClicked += (sender, e) =>
{
    bookmarksDialog.Dismiss();
};
bookmarksDialog.ExportAnnotations += (sender, e) =>
{
    // handle export annotations here
    bookmarksDialog.Dismiss();
};
bookmarksDialog.OutlineClicked += (sender, e) =>
{
    bookmarksDialog.Dismiss();
};
bookmarksDialog.UserBookmarkClick += (sender, e) =>
{
    mPdfViewCtrl.SetCurrentPage(e.PageNum);
    bookmarksDialog.Dismiss();
};
```

{% endcode %}

## Customization

The `BookmarksDialogFragment` provides a flexible API for displaying only the desired child view. Any of the annotation list, document outline, or user-defined bookmark list view can be removed by omitting them from the `DialogFragmentTabs`.
{% endtab %}

{% tab title="iOS" %}

## List container to customize horizontal menu layout in Xamarin.iOS

{% hint style="info" %}
**This tutorial only applies to Xamarin.iOS. See Xamarin.Android equivalent here .**
{% endhint %}

The [`PTNavigationListsViewController`](https://sdk.apryse.com/api/xamarinios/tools/api/pdftron.PDF.Controls.PTNavigationListsViewController.html) class is a container view controller that shows the [annotation list](/xamarin/annotation/annotation-list.md#ios), [document outline](/xamarin/guides/ios/bookmark/outline.md#ui-component), and [user-defined bookmark](/xamarin/bookmarks/user-bookmarks.md#ios) list controls with a `UITabBarController`-like interface. A segmented control is used to select which child view controller to display.

![](https://653871032-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgjsBtuYmcKhWOdM9VCg4%2Fuploads%2Fgit-blob-3b4fe3f15304cc68df980f8cdd4bc58c4130a6d3%2F08935ed43ed617260c9ad07c1e040c5114e3ba47-1242x2208.png?alt=media)

*The navigation lists control is part of the Tools library, so make sure you have* [*added the Tools library to your project*](/xamarin/ui-customization/setup.md)*.*

## Show a navigation lists view controller

To create a new navigation lists view controller and display it from another view controller, set the child list view controllers to the `PTNavigationListsViewController` class's [`ListViewControllers`](https://sdk.apryse.com/api/xamarinios/tools/api/pdftron.PDF.Controls.PTNavigationListsViewController.html#pdftron_PDF_Controls_PTNavigationListsViewController_ListViewControllers) property:

{% code lineNumbers="true" %}

```csharp
var navigationListsViewController = new PTNavigationListsViewController(mToolManager);

var annotationViewController = new PTAnnotationViewController(mPdfViewCtrl);
annotationViewController.AnnotationViewControllerAnnotationSelected += (object sender, AnnotationViewControllerAnnotationSelectedEventArgs e) => {
    // perform custom action
};
annotationViewController.AnnotationViewControllerDidCancel += (object sender, EventArgs e) => {
    // perform custom action
};

var outlineViewController = new PTOutlineViewController (mPdfViewCtrl);
outlineViewController.OutlineViewControllerOutlineSelected += (sender, e) => {
    // perform custom action
};
outlineViewController.OutlineViewControllerDidCancel += (object sender, EventArgs e) => {
    // perform custom action
};

var bookmarkViewController = new PTBookmarkViewController (mPdfViewCtrl);
bookmarkViewController.BookmarkViewControllerBookmarkSelected += (sender, e) => {
    // perform custom action
};
bookmarkViewController.BookmarkViewControllerDidCancel += (object sender, EventArgs e) => {
    // perform custom action
};

navigationListsViewController.ListViewControllers = new UIViewController[] {
    outlineViewController, annotationViewController, bookmarkViewController
};
if (UserInterfaceIdiomIsPhone)
{
  navigationListsViewController.ModalPresentationStyle = UIModalPresentationStyle.FullScreen;
} else{
  navigationListsViewController.ModalPresentationStyle = UIModalPresentationStyle.Popover;
  navigationListsViewController.PopoverPresentationController.BarButtonItem = navigationListsButton;
}
this.PresentViewController(navigationListsViewController, true, null);
```

{% endcode %}

{% hint style="info" %}
**Presenting on iPads:**

The navigation list view controller is designed to be presented in a popover on iPads. To do so, you must provide the `PTNavigationListsViewController`'s [`PopoverPresentationController`](https://docs.microsoft.com/en-us/dotnet/api/uikit.uipopoverpresentationcontroller) with either:

* a [`SourceRect`](https://docs.microsoft.com/en-us/dotnet/api/uikit.uipopoverpresentationcontroller.sourcerect#UIKit_UIPopoverPresentationController_SourceRect) AND
* a [`SourceView`](https://docs.microsoft.com/en-us/dotnet/api/uikit.uipopoverpresentationcontroller.sourceview#UIKit_UIPopoverPresentationController_SourceView)

OR

* a [`BarButtonItem`](https://docs.microsoft.com/en-us/dotnet/api/uikit.uipopoverpresentationcontroller.barbuttonitem#UIKit_UIPopoverPresentationController_BarButtonItem)

as in the example above.
{% endhint %}

## Customization

The `PTNavigationListViewController` provides a flexible API for displaying only the desired child view controllers. Any of the annotation list, document outline, or user-defined bookmark list view controllers can be removed by omitting them from the `listViewControllers` property. It is also possible to add a custom child view controller by adding it to the `listViewControllers` array.

To specify which of the child view controllers to display on opening the navigation list control, either the [`SelectedIndex`](https://sdk.apryse.com/api/xamarinios/tools/api/pdftron.PDF.Controls.PTNavigationListsViewController.html#pdftron_PDF_Controls_PTNavigationListsViewController_SelectedIndex) , or the [`SelectedViewController`](https://sdk.apryse.com/api/xamarinios/tools/api/pdftron.PDF.Controls.PTNavigationListsViewController.html#pdftron_PDF_Controls_PTNavigationListsViewController_SelectedViewController) property can be used.

{% code lineNumbers="true" %}

```csharp
// Show the navigationListsViewController's annotationViewController on opening
navigationListsViewController.SelectedViewController = navigationListsViewController.annotationViewController;
// OR specify an index to show from the `listViewControllers` property
navigationListsViewController.SelectedIndex = 0;
```

{% endcode %}
{% endtab %}
{% endtabs %}


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