force ScrollRect.content setup [re-submission]

[hugoymh]

Unity UI Extensions - Pull Request

Overview

**this is a resubmission of PR#484，re-targeting to development branch
Added a minor change in ScrollSnapBase to setup HSS/VSS properly in code.

Changes

In order for HSS/VSS to work properly, the Content RectTransform under ScrollRect must have the anchors setup as stretched to the four corners and also has the same rect dimensions of its parent RT before <HSS or VSS>.DistributePages() is executed.

The added code forces these parameters in case they are not setup properly in Unity Inspector

inside ScrollSnapBase.Awake() :

_screensContainer = _scroll_rect.content;

//ScrollRect.content RT anchors has to be stretched first in order for HSS/VSS.DistributePages() to have the correct result
_screensContainer.anchorMin = Vector2.zero;
_screensContainer.anchorMax = Vector2.one;
_screensContainer.sizeDelta = Vector2.zero;

Testing status

• No tests have been added.

Manual testing status

[SimonDarksideJ]

Apologies for the delay, will get this reviewed asap