ListView, TileView and Table

Note

Table is ListView with specific DefaultItem and Table Header (it also provides Table specific methods). Widget with scripts should be created by Widgets Generator.

• All collections widgets support virtualization: gameobjects created only for the visible items.

• Different ListView, TileView and Table can display the same list simultaneously.

• In most cases ToggleGroup and SwitchGroup components used by widgets under DefaultItem hierarchy should be placed outside DefaultItem gameobject. And on value changed callbacks should process all items, not only the current one, since invisible items do not receive callbacks because of the virtualization.

List View Type

ListView with Fixed Size.

ListView with Variable Size.

ListView with Ellipse layout.

TileView with Fixed Size.

TileView with Variable Size.

TileView Staggered.

ListView.Container settings for the Ellipse type

• RectTransform.pivot

  Defines on which side or corner will be the center point.

• EasyLayout.Ellipse settings

  Width and height usually should be specified, set the same value for the circle.

• Angle Start

  Base rotation for the first item.

• Angle Step Auto

  Should be disabled.

• Angle Step

  Angular distance between items.

• Fill

  Should be Arc.

• Arc Length

  Should be 180 if center at the side and 90 if center at the corner.

Options

• Interactable bool

  Allow users interact with the ListView.

• Virtualization bool

  Enable virtualization. If enabled GameObject instantiated only for the visible items; otherwise for the all items.

• List Type ListViewType

  Determines how items are displayed.

  • ListViewWithFixedSize

    Works with EasyLayout, Horizontal Layout Group and Vertical Layout Group.

  • ListViewWithVariableSize

    Works with EasyLayout, Horizontal Layout Group and Vertical Layout Group.

  • ListViewEllipse

    Works with EasyLayout.

  • TileViewWithFixedSize

    Works with EasyLayout.

  • TileViewWithVariableSize

    Works with EasyLayout.

  • TileViewStaggered

    Works with EasyLayout.

• Sort bool deprecated

  If enabled items will be sorted with SortFunc. Deprecated, replaced with DataSource.Comparer.

• SortFunc Func<IEnumerable<TItem>, IEnumerable<TItem>> deprecated

  Not available in the Inspector window Function to sort items. Deprecated, replaced with DataSource.Comparer.

• Data Source ObservableList<TItem>

  List of the items. It works the same way as List<T> with some additions.

  Not available in the inspector window if type not specified as serializable.

• Multiple Select bool

  Allow to select multiple items, otherwise only one.

• Range Mode RangeSelectionMode

  Specify range selection mode (multiple items selection with Shift key).

  • StartFromFirst

    Select all items from the first selected item to the newly selected item.

  • StartFromLast

    Select all items from the last selected item to the newly selected item.

• Selected Index int

  Index of the last selected item.

• Selected Indices List<int>

  Not available in the Inspector window List of the selected items indices.

• Selected Item TItem

  Not available in the Inspector window Last selected item.

• Selected Items List<TItem>

  Not available in the Inspector window List of the selected items.

• Direction ListViewDirection

  ListView direction.

  • Horizontal

  • Vertical

• Reversed Order bool

  Display first item at bottom and last item at top.

• Default Item TComponent

  A prefab used to display item.

• Container Transform

  The container of the instantiated gameobjects used to display items. Should have layout required for the specified List Type.

• ScrollRect ScrollRect

  ScrollRect used by ListView. Required for virtualization support.

• Allow Coloring bool

  Change colors of the highlighted and selected items.

  If you want to more precise control on item colors, like different colors depending of item data, then you can override StateDefault(), StateHighlighted(), StateSelected() methods of TComponent class.

• Colors

  Colors for the text and background elements of the DefaultItem instances.

  Text and background elements defined with GraphicsForeground and GraphicsBackground properties of the TComponent.

  • Default Color Color

  • Default Background Color Color

  • Highlighted Color Color

  • Highlighted Background Color Color

  • Selected Color Color

  • Selected Background Color Color

  • Disabled Color Color: multiplicator, actual color is current color (default, highlighted, selected) * disabled Color.

• Keep Highlight bool

  Keep item highlight on pointer enter until will be selected another gameobject.

• Only One Highlighted bool

  Allows only one highlighted item. If disabled then two can be highlighted: first from pointer over, second from navigation by keyboard or gamepad.

• Fade Duration float

  Time for a smooth color change when the state of an element changes.

• End Scroll Delay float

  Delay from last scroll event to OnEndScrolling event raising.

• Navigation bool

  Allow to use navigation with keyboard or gamepad.

• Looped List bool

  Is list looped? First items will be displayed after the last item and scrolling scrolling are infinite. Recommended to disable scrollbar.

• Is Table bool

  Is ListView will be displayed as a table? Used for correct styles support.

• Set Content Size Fitter bool

  Changes ContentSizeFitter settings according to the selected direction. Disable if you want to use manual settings.

• Scroll Unscaled Time bool

  Specify time type used by scroll animation.

  If enabled then will be used Time.unscaledTime; otherwise will be used Time.time.

• Scroll Movement AnimationCurve

  Animation curve for the ScrollTo functions.

  Specify how long scroll animation will be and what speed will it have.

• Center The Items bool

  Display items at the center of the list if items not enough to fill the list.

• Precalculate Item Size bool

  Precalculate items sizes for List Type with items of variable size.

  You can disable this option to increase performance in exchange to less accurate scrolling.

• Auto Scroll Area float

  ListView will be automatically scrolled if the pointer in less then a specified distance from the border during drag&drop.

• Auto Scroll Speed float

  Speed of auto-scroll.

• Can Select Func<int, bool>

  The function that determines whether the item with the specified index can be selected. Unselectable items cannot be highlighted and skipped by keyboard and gamepad navigation.

• Can Deselect Func<int, bool>

  The function that determines whether the item with the specified index can be deselected.

• Scroll Inertia Until Item Center bool

  Enable custom scroll inertia.

  It is replace ScrollRect inertia in such a way so that after the end of scrolling the item will be exactly in the center.

  Intended to use with ListViewEllipse but works with other types too.

• Scroll Inertia AnimationCurve

  Similar to Scroll Movement, but only for the scroll inertia.

Events

• OnSelect UnityEvent<int, ListViewItem>

  The event raised when item selected.

  Arguments: index of the selected item and DefaultItem instance for the selected item.

• OnDeselect UnityEvent<int, ListViewItem>

  The event raised when item deselected.

  Arguments: index of the deselected item and DefaultItem instance for the deselected item.

  If an item associated with this index is removed the index can be invalid ( >= DataSouce.Count) or point to different item.

• OnSelectObject UnityEvent<int>

  The event raised when item selected.

  Arguments: index of the selected item.

• OnDeselectObject UnityEvent<int>

  The event raised when item deselected.

  Arguments: index of the deselected item. If an item associated with this index is removed the index can be invalid ( >= DataSouce.Count) or point to different item.

• OnStartScrolling UnityEvent

  The event raised when scrolling starts.

• OnEndScrolling UnityEvent

  The event raised when after End Scroll Delay from left last scroll event.

• onSubmit UnityEvent

  The event raised when ListView gameobject has been selected via a “submit” key you specify (default is the return key).

• onCancel UnityEvent

  The event raised when ListView gameobject has been deselected.

• onItemSelect UnityEvent

  The event raised when ListView item gameobject has been selected via a “submit” key you specify (default is the return key).

• onItemCancel UnityEvent

  The event raised when ListView item gameobject has been deselected.

• OnUpdateView UnityEvent

  The event raised when ListView view was updated.

• OnFocusIn UnityEvent<BaseEventData>

  The event raised when ListView gameobject received focus.

• OnFocusOut UnityEvent<BaseEventData>

  The event raised when ListView gameobject lost focus.

• OnPointerEnterObject UnityEvent<int>

  The event raised when pointer entered on ListView item gameobject.

  Arguments: index of the item.

• OnPointerExitObject UnityEvent<int>

  The event raised when pointer exited on ListView item gameobject.

  Arguments: index of the item.

• OnDataSourceChanged UnityEvent<ListViewCustom<TComponent, TItem>>

  The event raised when DataSource replaced with the new list.

  Arguments: ListView instance.

Items Events

It is ListView.ItemsEvents field with list of items events. First argument is item index, second is item instance instance, third is event data.

• PointerClick UnityEvent<int, ListViewItem, PointerEventData>

  The event raised on every pointer click on item instance.

• FirstClick UnityEvent<int, ListViewItem, PointerEventData>

  The event raised on first pointer click with left mouse button on item instance.

• DoubleClick UnityEvent<int, ListViewItem, PointerEventData>

  The event raised on second pointer click with left mouse button on item instance.

• PointerUp UnityEvent<int, ListViewItem, PointerEventData>

  The event raised on pointer up on item instance.

• PointerDown UnityEvent<int, ListViewItem, PointerEventData>

  The event raised on pointer down on item instance.

• PointerEnter UnityEvent<int, ListViewItem, PointerEventData>

  The event raised on pointer enter on item instance.

• PointerExit UnityEvent<int, ListViewItem, PointerEventData>

  The event raised on pointer exit on item instance.

• Move UnityEvent<int, ListViewItem, AxisEventData>

  The event raised on move with keyboard or gamepad on item instance.

• Submit UnityEvent<int, ListViewItem, BaseEventData>

  The event raised on submit on item instance.

• Cancel UnityEvent<int, ListViewItem, BaseEventData>

  The event raised on cancel on item instance.

• Select UnityEvent<int, ListViewItem, BaseEventData>

  The event raised when item instance has been selected by EventSystem.

• Deselect UnityEvent<int, ListViewItem, BaseEventData>

  The event raised when item instance has been deselected by EventSystem.

• Resize UnityEvent<int, ListViewItem, Vector2>

  The event raised when item instance size was changed.

• MovedToCache UnityEvent<ListViewItem>

  The event raised before item instance recycled.

  Use this event to clean data, unload sprites, stop instance animations.

ListViewComponent Class

Component to display item.

Fields and properties

• Index int

  Index of the displayed item. Negative if item not displayed or not used by ListView.

• Owner ListViewBase

  Reference to ListView.

• DisableRecycling bool

  Disable recycling of this instance. Used in Drag&Drop or animations (enable at the start of the animation and disable at the end).

• GraphicsForeground Graphic[]

  References to the foreground objects like Text.

• GraphicsBackground Graphic[]

  References to the background objects.

• DisableRecycling bool

  If enabled prevent instance recycling until this option is disabled.

Methods

• SetData(TItem item)

  Set data.

• SelectItem()

  Select current item.

• DeselectItem()

  Deselect current item.

• RemoveItem()

  Remove current item from the ListView.DataSource.

• GraphicsColoring(Color foregroundColor, Color backgroundColor, float fadeDuration)

  Called by ListView to set colors for the GraphicsForeground and GraphicsBackground.

• MovedToCache()

  Called by ListView when GameObject moved to cache or recycled to unload unused resources like sprites.

• StateDefault()

  Called by ListView when item in the default state.

• StateSelected()

  Called by ListView when item selected.

• StateHighlighted()

  Called by ListView when item highlighted.

• Vector2 GetInstanceSize(int index)

  Get the size of the instance for the item with the specified index. Used to animate items resize without problems with virtualization.

• SetInstanceSize(int index, Vector2 size)

  Set the size of the instance for the item with the specified index. UpdateView() should be called after it to apply changes. Used to animate items resize without problems with virtualization.

• ResetInstanceSize(int index)

  Reset the size to the default for the item with the specified index. UpdateView() should be called after it to apply changes. Used to animate items resize without problems with virtualization.

Auto-Resize DefaultItem instances on ListView Resize Maintaing Aspect Ratio

• DefaultItem.RectTransform anchors should be set to the horizontal or vertical stretch depending on ListView.Direction

• Add Aspect Ratio Fitter to the DefaultItem and set Aspect Mode = Width Controls Height or Height Controls Width depending on ListView.Direction

• Change ListView.ListType to List View With Variable Size or Tile View With Variable Size

• Make sure that ListView.Container.EasyLayout children size set to Do Nothing.

ListView with Items of Variable Size

ListView and TileView can display items with different heights or widths (it cannot be both at the same time).

1. ListView.DefaultItem: add layout group component (it can be Horizontal Layout Group, Vertical Layout Group, or EasyLayout)

   • in case of Horizontal Layout Group or Vertical Layout Group: enable Height for Control Child Size, specify Padding and Spacing if needed.

   • in case of EasyLayout: change Children Height to Set Preferred, specify Margin and Spacing if needed.

   If the ListView Direction is Horizontal then use width related options instead of height. LayoutElement component can be to DefaultItem to specify minimal width or height and other options.

   

2. ListView.Container: change Children Height to Set Preferred in EasyLayout component

   

3 ListView: change List Type to List View With Variable Size, Tile View With Variable Size, or Tile View Staggered

Layout group will resize nested game objects and determine the size of each item. EasyLayout will resize those items and ListView will correctly process items with different sizes.

Multiple DefaultItems

ListView has the TemplateSelector property, it allow to use of different templates depending on the item or index.

namespace UIWidgets.Examples
{
   using UnityEngine;

   public class TreeViewMultipleDefaultItems : MonoBehaviour, IListViewTemplateSelector<TreeViewSampleComponent, ListNode<ITreeViewSampleItem>>
   {
      [SerializeField]
      protected TreeViewSample TreeView;

      [SerializeField]
      protected TreeViewSampleComponentContinent ContinentTemplate;

      [SerializeField]
      protected TreeViewSampleComponentCountry CountryTemplate;

      protected virtual void Start()
      {
         TreeView.TemplateSelector = this;
      }

      public TreeViewSampleComponent[] AllTemplates()
      {
         return new TreeViewSampleComponent[] { ContinentTemplate, CountryTemplate };
      }

      public TreeViewSampleComponent Select(int index, ListNode<ITreeViewSampleItem> item)
      {
         if (item.Node.Item is TreeViewSampleItemContinent)
         {
            return ContinentTemplate;
         }

         return CountryTemplate;
      }
   }
}

IListViewTemplateSelector Interface

Methods:

• TComponent[] AllTemplates()

  Get all possible templates.

• TComponent Select(int index, TItem item);

  Returns template to use for specified item with index.

DefaultItem Instances

// also available .Active and .Cache modes
foreach (var instance in ListView.GetComponentsEnumerator(PoolEnumeratorMode.All))
{
   // do somethind with DefaultItem instance
}

Add Item

var new_item = new ListViewIconsItemDescription()
{
   Icon = sampleIcon,
   Name = "test item",
};
listView.DataSource.Add(new_item);

Get Items

var items = listView.DataSource;

Set Items

var items = new ObservableList<ListViewIconsItemDescription>();
listView.DataSource = items;

var items2 = new List<ListViewIconsItemDescription>();
listView.DataSource = items2.ToObservableList();

Display Same List with ListView, TileView or Table

var items = new ObservableList<ListViewIconsItemDescription>();
listView.DataSource = items;
tileView.DataSource = items;
table.DataSource = items;

Get Last Selected Index

Debug.Log(listView.SelectedIndex);

Get Selected Indices

var indices = listView.SelectedIndices;
Debug.Log(string.Join(", ", indices.ConvertAll(x => x.ToString()).ToArray()));

Last Selected Item

Debug.Log(listView.SelectedItem.Name);

Get Selected Items

var selected_items = listView.SelectedItems;
Debug.Log(string.Join(", ", selected_items.ConvertAll(x => x.Name).ToArray()));

Delete Specified Item

listView.DataSource.Remove(items[0]);

Delete Item by Index

listView.DataSource.RemoveAt(0);

Clear List

listView.DataSource.Clear();

Add Items

var new_items = new List<ListViewIconsItemDescription>()
{
   new_item,
   new_item,
   new_item,
};
listView.DataSource.AddRange(new_items);

Optimization

// Use BeginUpdate() and EndUpdate() to keep widget from updating on each change.
// All changes after BeginUpdate() call will be displayed with EndUpdate() call.
var items = listView.DataSource;
items.BeginUpdate();

items.Clear();
items.Add(new_item);
items.Add(new_item);
items.Add(new_item);
items.AddRange(new_items);
items.RemoveAt(0);

// widget will be updated after EndUpdate() call
items.EndUpdate();

Replace Item

listView.DataSource[0] = new ListViewIconsItemDescription()
{
   Name = "new item"
};

Sort

// Sort by LocalizedName or Name in ascending order
Comparison<ListViewIconsItemDescription> ItemsComparisonAsc = (x, y) => x.Name.CompareTo(y.Name);

// sort by LocalizedName or Name in descending order
Comparison<ListViewIconsItemDescription> ItemsComparisonDesc = (x, y) => -(x.Name).CompareTo(y.Name);

// sort items only once
items.Sort(ItemsComparisonAsc);

Enable Permanent Sort

items.Comparison = ItemsComparisonDesc;

Important

Items will be always sorted, but if you use .BeginUpdate() then items will be re-sorted only after .EndUpdate() call.

Disable Permanent Sort

items.Comparison = null;

Set Selected Index

listView.SelectedIndex = 1;

Or:

listView.Select(1);

Behavior is different if you enable MultipleSelect:

• listView.SelectedIndex = 1 last selected item will be deselected and specified item will be selected.

• listView.Select(1) new item will be added to selected items.

Deselect

listView.SelectedIndex = -1;

Or:

listView.Deselect(1);

Adding Callbacks to Custom Events of the Components

public class YourListView : ListViewCustom<YourListViewItemComponent, YourListViewItem>
{
    protected override void AddCallback(ListViewItem item)
    {
        base.AddCallback(item);
        item.onDoubleClick.AddListener(ProcessDoubleClick);
    }

    protected override void RemoveCallback(ListViewItem item)
    {
        base.RemoveCallback(item);
        item.onDoubleClick.RemoveListener(ProcessDoubleClick);
    }

    void ProcessDoubleClick(int index)
    {
        Debug.Log("double click: " + DataSource[index]);
    }
}

Scroll to Item

listView.ScrollToAnimated(index);

Disable Items

protected virtual void Start()
{
   listView.CanSelect = CanBuy;
}

bool CanBuy(Item item)
{
   return player.Money >= item.Price;
}

Example of ListView with Filter

namespace UIWidgets.Examples
{
   using System.Collections.Generic;
   using UIWidgets;
   using UnityEngine;
   using UnityEngine.Serialization;

   /// <summary>
   /// Sample ListViewIcons with filter.
   /// </summary>
   public class ListViewIconsWithFilter : ListViewIcons
   {
      [SerializeField]
      List<ListViewIconsItemDescription> listItems = new List<ListViewIconsItemDescription>();

      ObservableList<ListViewIconsItemDescription> originalItems;

      /// <summary>
      /// Get or sets items.
      /// </summary>
      public ObservableList<ListViewIconsItemDescription> OriginalItems
      {
         get
         {
            if (originalItems == null)
            {
               originalItems = new ObservableList<ListViewIconsItemDescription>(listItems);
               originalItems.OnChange += Filter;
            }

            return originalItems;
         }

         set
         {
            if (originalItems != null)
            {
               originalItems.OnChange -= Filter;
            }

            originalItems = value;

            if (originalItems != null)
            {
               originalItems.OnChange += Filter;
            }
         }
      }

      /// <summary>
      /// Search string.
      /// </summary>
      protected string Search = string.Empty;

      /// <summary>
      /// Filter data using specified search string.
      /// </summary>
      /// <param name="search">Search string.</param>
      public void Filter(string search)
      {
         Search = search;
         Filter();
      }

      /// <summary>
      /// Copy items from OriginalItems to DataSource if it's match specified string.
      /// </summary>
      protected void Filter()
      {
         DataSource.BeginUpdate();
         DataSource.Clear();

         if (string.IsNullOrEmpty(Search))
         {
            // if search string not specified add all items
            DataSource.AddRange(OriginalItems);
         }
         else
         {
            // else add items with name starts with the specified string
            var finded = OriginalItems.FindAll(x => x.Name.StartsWith(Search));
            DataSource.AddRange(finded);
         }

         DataSource.EndUpdate();
      }

      /// <summary>
      /// Init this instance.
      /// </summary>
      public override void Init()
      {
         base.Init();

         // call Filter() to set initial DataSource
         Filter();
      }

      /// <summary>
      /// Process the destroy event.
      /// </summary>
      protected override void OnDestroy()
      {
         if (originalItems != null)
         {
            originalItems.OnChange -= Filter;
         }

         base.OnDestroy();
      }
   }
}

Stop Animations

protected virtual void Start()
{
   ListView.ItemsEvents.MovedToCache.AddListener(StopAnimations);
}

void StopAnimations(int index, ListViewItem instance)
{
   instance.StopSelectableAnimations();
   instance.Animator.ResetTrigger("customState");
}

Prevent Instance Recycling

You can prevent instance recycling if some action is running (like drag&drop) and the instance should be available until it ends.

protected override void InitDrag(PointerEventData eventData)
{
   Instance.DisableRecycling = true;
   // ....
}

public override void Dropped(bool success)
{
   Instance.DisableRecycling = false;
   // ...
}