970094 - Expose a mechanism to configure APZC authorize overscroll

Status: RESOLVED INVALID

(Core :: Panning and Zooming, defect)

Description

[Vivien Nicolas (:vingtetun) (:21) - (NOT reading bugmails, needinfo? please)]

In order to build a keyboard that does not resize windows it would be handy to have a mechanism, configurable from the system app, to define an overscrollable amount for pannable that are partly covered by the keyboard.

Comment 1

[Vivien Nicolas (:vingtetun) (:21) - (NOT reading bugmails, needinfo? please)]

Attachment: overscroll.for.keyboard.poc.patch

Something that just change the mScrollableRect like this patch should be handy. This will obviously need more love to redirect events to the right target by taking into account the overscrolled content.

Also the allowed overscrollable amount should take into account the y/height position of the scrollable in order to not offer to much overscroll.

Comment 2

[Vivien Nicolas (:vingtetun) (:21) - (NOT reading bugmails, needinfo? please)]

Thinking loud a way to configure that could be to establish a bridge BrowserElementParent -> TabParent -> RenderFrameParent -> APZCTreeController that set the right mScrollableRect for an AsyncPanZoomController.

That will let the system app call a method on a particular <iframe mozbrowser> in order to define the allowed overscroll based on the keyboard height.

Comment 3

[Kartikaya Gupta (email:[e-mail])]

I think the latest version of the patch in bug 970093 incorporates the conceptual purpose of the change here, so it obsoletes this bug.