Bug 107200 – [WK2] Minimum layout width auto-sizing should use FrameView::enableAutoSizeMode so that it can shrink the viewport

• Component: WebKit2
• Status: RESOLVED FIXED

[Tim Horton]

<rdar://problem/12849029>

Using minimum layout width auto-sizing currently doesn't shrink past the current viewport size, so it can only get *taller*, never shorter. FrameView::enableAutoSizeMode already fiddles with layout to fix this, so we should make use of it!

[Tim Horton]

Created attachment 183316 [details]
patch

[Tim Horton]

Hmm, I should probably support falling back out of auto-sizing mode.

[Tim Horton]

Created attachment 183319 [details]
patch with a const and WebPage will disable the mode if needed

[Simon Fraser (smfr)]

Comment on attachment 183319 [details]
patch with a const and WebPage will disable the mode if needed

View in context: https://bugs.webkit.org/attachment.cgi?id=183319&action=review

> Source/WebKit2/WebProcess/WebPage/WebPage.cpp:3787
> +    if (!m_minimumLayoutWidth)
> +        corePage()->mainFrame()->view()->enableAutoSizeMode(false, IntSize(), IntSize());

It's weird that you disable auto size mode here, but enable it in the drawing area. I think this should be fixed; this mode should be indpendent of what kind of drawing area is being used.

[Tim Horton]

Created attachment 183341 [details]
patch

[Simon Fraser (smfr)]

Comment on attachment 183341 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=183341&action=review

> Source/WebKit2/WebProcess/WebPage/WebPage.cpp:3789
> +    m_minimumLayoutWidth = minimumLayoutWidth;
> +
> +    if (minimumLayoutWidth > 0)
> +        corePage()->mainFrame()->view()->enableAutoSizeMode(true, IntSize(minimumLayoutWidth, 1), IntSize(minimumLayoutWidth, INT_MAX));
> +    else
> +        corePage()->mainFrame()->view()->enableAutoSizeMode(false, IntSize(), IntSize());

Do we have to call enableAutoSizeMode() even when m_minimumLayoutWidth doesn't change?

> Source/WebKit2/WebProcess/WebPage/mac/TiledCoreAnimationDrawingArea.mm:-375
> -    if (m_minimumLayoutWidth > 0) {
> -        m_webPage->setSize(IntSize(m_minimumLayoutWidth, 0));
> -        m_webPage->layoutIfNeeded();
> +    if (!m_webPage->minimumLayoutWidth())
> +        m_webPage->setSize(size);
> +
> +    m_webPage->layoutIfNeeded();
>  
> +    if (m_webPage->minimumLayoutWidth()) {
>          contentSize = m_webPage->mainWebFrame()->contentBounds().size();
>          size = contentSize;
>      }
>  
> -    m_webPage->setSize(size);
> -    m_webPage->layoutIfNeeded();

This is pretty confusing. I don't know whose responsibility it is to set the size of the WebPage.

[Tim Horton]

http://trac.webkit.org/changeset/140087

[Tim Horton]

Aahhhh, all the random assertion failures. I'm investigating.

[Tim Horton]

(In reply to comment #8)
> Aahhhh, all the random assertion failures. I'm investigating.

I can reproduce with this rolled out, must be something else.