Instructions

Instructions

User Manual:

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USAGE INSTRUCTIONS
ScrollrectItemsAdapter8, BaseParams and BaseItemViewsHolder are the 3 core classes in our small library

dedicated to both optimize a Scroll View and programmatically manage its contents.
You can use it both for a horizontal and vertical ScrollView.
ScrollrectItemsAdapter8 it’s an abstract class, because you need to provide the height or width

(depending if it’s a vertical or horizontal ScrollRect) of each item (via your implementation of
ScrollrectItemsAdapter8.GetItem[Height/Width](int index) callback) and to populate the views with
data for each item (via your implementation of
ScrollrectItemsAdapter8.InitOrUpdateItemViewHolder(BaseItemViewsHolder viewsHolder) callback).
It's recommended to manually go through example code provided in ScrollRectItemsAdapterExample.cs
and SimpleTutorial.cs in order to fully understand the mechanism. You’ll find detailed comments in
core areas. You may even use this script directly without implementing your own, in some simple
scenarios.
(Some may find it more easy to consult the example code+scene directly ,without reading this tutorial)

IMPLEMENTATION
(Follow these steps while constantly looking at how it’s done in the example code in SimpleTutorial.cs
and optionally in ScrollRectItemsAdapterExample.cs)
Here’s the normal flow you’ll follow after you’ve created a Scroll View using GameObject->UI->Scroll
View:

1. create your own implementation of BaseItemViewsHolder, let's name it MyItemViewsHolder
2. create your own implementation of BaseParams (if needed), let's name it MyParams
3. create your own implementation of ScrollRectItemsAdapter8, let's
name it MyScrollRectItemsAdapter
4. instantiate MyScrollRectItemsAdapter
5. call MyScrollRectItemsAdapter.ChangeItemCountTo(int count) once (and any time your dataset is
changed) and two things will happen:
5.1. if the ScrollRect has vertical scrolling, MyScrollRectItemsAdapter.GetItemHeight(int index)
will be called  times (with index going from 0 to )
else if the ScrollRect has horizontal scrolling, MyScrollRectItemsAdapter.GetItemWidth(int
index) will ... [idem above] ...
5.2 CreateViewsHolder(int) will be called for each view that needs created. Once a view is created,
it'll be re-used when it goes off-viewport
- newOrRecycledViewsHolder.root will be null, so you need to instantiate your prefab (or whatever),
assign it and call newOrRecycledViewsHolder.CollectViews(). Alternatively, you can call its
AbstractViewHolder.Init(..) method, which can do a lot of things for you, mainly instantiate the prefab
and (if you want) call CollectViews()

- after creation, only MyScrollRectItemsAdapter.UpdateItemViewHolder() will be called for it when its
represented item changes and becomes visible
- this method is also called when the viewport's size grows, thus needing more items to be visible at once
5.3. MyScrollRectItemsAdapter.UpdateViewsHolder(MyItemViewsHolder) will be called when an item is
to be displayed or simply needs updating:
- use newOrRecycledViewsHolder.itemIndex to get the item index, so you can retrieve its associated
model from your data set (most common practice is to store the data list in your Params implementation)
- newOrRecycledViewsHolder.root is not null here (given the view holder was properly created in
CreateViewsHolder(..)). It's assigned a valid object whose UI elements only need their values changed
(common practice is to implement helper methods in the view holder that take the model and update
the views themselves)
5. call MyScrollRectItemsAdapter.Dispose() when you’re done using it (usually, in the ScrollRect’s
OnDestroy())

EXAMPLE SCENES & UTILITIES
All the example scenes & the utlity scripts are provided on an "as-is" base. Their main purpose is to
demonstrate the feature-set and show you the basic code-flow when implementing the adapter,
following the recommended best-practices & conventions.

KNOWN ISSUES
- Not actually related to the plugin itself, but worth mentioning: some lower-end devices have terrible
performance with Open GL 3 and/or Auto Graphics API. If you experience oddly low FPS, untick Auto
Graphics API and use Open GL 2 instead.
- In the ContentSizeFitter example scene: the prefab's Text will be oddly truncated if its "Vertical
Overflow" property is set to "Truncate". So a as general rule, set it to "Overflow" when you have similar
scenarios. Likewise, if you have a horizontal ScrollView, the "Horizontal Overflow" property is the one to
be modified.
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Creator                         : Online2PDF.com
Producer                        : Online2PDF.com
Create Date                     : 2017:08:11 12:02:37
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