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LibWeb: Layout viewport rect was lagging behind when resizing

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Layout was using an outdated viewport rect that we set *after* doing
a layout due to resize. That meant that layout-in-response-to-resize
was always lagging behind the current size of the view.

The root of this problem was how Frame kept both a viewport rect
(with both scroll offset and size) and a frame size. To fix this,
only store the viewport scroll offset, and always use the frame size.
This way they can't get out of sync and the problem goes away. :^)

Fixes #4250.
This commit is contained in:
Andreas Kling 2020-12-02 23:40:57 +01:00
parent 766db673c1
commit 15e35b0d71
4 changed files with 11 additions and 11 deletions
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10
Libraries/LibWeb/Page/Frame.cpp
View file

@ -106,19 +106,19 @@ void Frame::set_size(const Gfx::IntSize& size)
m_document->layout();
}
void Frame::set_viewport_rect(const Gfx::IntRect& rect)
void Frame::set_viewport_scroll_offset(const Gfx::IntPoint& offset)
{
if (m_viewport_rect == rect)
if (m_viewport_scroll_offset == offset)
return;
m_viewport_rect = rect;
m_viewport_scroll_offset = offset;
if (m_document && m_document->layout_node())
m_document->layout_node()->did_set_viewport_rect({}, rect);
m_document->layout_node()->did_set_viewport_rect({}, viewport_rect());
}
void Frame::set_needs_display(const Gfx::IntRect& rect)
{
if (!m_viewport_rect.intersects(rect))
if (!viewport_rect().intersects(rect))
return;
if (is_main_frame()) {