Disable scrollbars at content embedder level

[Luke Halliwell]

Is there a setting to prevent Chromium from automatically creating scrollbars for a page?  (The motivation is for TV platforms where there is no user input mechanism, so no way to scroll).

[Elliott Sprehn]

Maybe try enabling overlay scrollbars? You might also chat with some Opera folks as they run Chromium on TVs with a bunch of patches on top that customize various things for that type of device.

On Jul 12, 2016 8:47 PM, "Luke Halliwell" <hall...@chromium.org> wrote:

Is there a setting to prevent Chromium from automatically creating scrollbars for a page?  (The motivation is for TV platforms where there is no user input mechanism, so no way to scroll).

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[Eric Seckler]

For Headless Chrome, we're also interested in taking screenshots without scrollbars showing. We didn't look into this further yet, though. Luke, feel free to keep us in the loop. Overlay scrollbars are hidden initially but show when scrolling, which might be exactly what you need (yet, it's not quite what we need for headless).

[Steve Kobes]

Blink has WebFrame::setCanHaveScrollbars, which is used when Javascript calls window.open with "scrollbars=no".

It looks like it's also hooked up to RenderViewHost::DisableScrollbarsForThreshold, which isn't called anywhere(?).  Perhaps you can use that, or adapt it to your needs.

[Luke Halliwell]

Thanks for all the pointers.  Overlay scrollbars are an improvement in that they're less noticeable, and trivial to enable.  But they do show up still sometimes.

setCanHaveScrollbars seems more effective (I just quickly hacked in a call to verify this), but would obviously need some plumbing to make it usable (and it's not immediately clear to me what the interaction might be with other features).

Eric, will let you know if we make any progress (and I'm following your bug also).

Thanks,

Luke

[Eric Seckler]

Hi Luke,

We've added an experimental "--hide-scrollbars" flag, which should get rid of (native, i.e. non-customized) scrollbars. Maybe that's also useful for you :)

Cheers,

Eric

[Peter Kasting]

On Mon, Aug 22, 2016 at 1:01 AM, Eric Seckler <esec...@chromium.org> wrote:

We've added an experimental "--hide-scrollbars" flag, which should get rid of (native, i.e. non-customized) scrollbars. Maybe that's also useful for you :)

As the unofficial Chromium flags owner:

Flags must be limited-time options with a deprecation and removal plan.  What is the motivation for adding this flag, and the plan for removing it?

It is not acceptable to add this flag permanently, so hopefully that was not your intent.

PK

[Eric Seckler]

Eventually, it should become a more selective option controlled through an API e.g. at WebContents level, rather than flag. Filed another bug to track that:

https://bugs.chromium.org/p/chromium/issues/detail?id=639806

[Peter Kasting]

On Mon, Aug 22, 2016 at 4:41 AM, Eric Seckler <esec...@chromium.org> wrote:

Eventually, it should become a more selective option controlled through an API e.g. at WebContents level, rather than flag. Filed another bug to track that:

https://bugs.chromium.org/p/chromium/issues/detail?id=639806

Cool, thanks for following up on this.

PK