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https://github.com/RGBCube/serenity
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LibWeb: Move scroll offset state from layout tree to dom tree
Scroll offset state should not be reset by layout tree rebuilt.
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b6ea4b002b
commit
55b5c61a79
3 changed files with 36 additions and 5 deletions
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@ -61,12 +61,35 @@ bool Box::is_scrollable() const
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return computed_values().overflow_y() == CSS::Overflow::Scroll;
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}
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CSSPixelPoint Box::scroll_offset() const
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{
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if (is_generated_for_before_pseudo_element())
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return pseudo_element_generator()->scroll_offset(DOM::Element::ScrollOffsetFor::PseudoBefore);
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if (is_generated_for_after_pseudo_element())
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return pseudo_element_generator()->scroll_offset(DOM::Element::ScrollOffsetFor::PseudoAfter);
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if (!is<DOM::Element>(*dom_node()))
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return {};
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return static_cast<DOM::Element const*>(dom_node())->scroll_offset(DOM::Element::ScrollOffsetFor::Self);
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}
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void Box::set_scroll_offset(CSSPixelPoint offset)
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{
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// FIXME: If there is horizontal and vertical scroll ignore only part of the new offset
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if (offset.y() < 0 || m_scroll_offset == offset)
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if (offset.y() < 0 || scroll_offset() == offset)
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return;
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m_scroll_offset = offset;
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if (is_generated_for_before_pseudo_element()) {
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pseudo_element_generator()->set_scroll_offset(DOM::Element::ScrollOffsetFor::PseudoBefore, offset);
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} else if (is_generated_for_after_pseudo_element()) {
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pseudo_element_generator()->set_scroll_offset(DOM::Element::ScrollOffsetFor::PseudoAfter, offset);
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} else if (is<DOM::Element>(*dom_node())) {
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static_cast<DOM::Element*>(dom_node())->set_scroll_offset(DOM::Element::ScrollOffsetFor::Self, offset);
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} else {
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return;
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}
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set_needs_display();
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}
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