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LibHTML: Add TreeNode::for_each_in_subtree_of_type<T>()

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This allows you to iterate a subtree and get a callback for every node
where is<T>(node) == true. This makes for quite pleasant DOM traversal.
This commit is contained in:
Andreas Kling 2019-12-18 21:34:03 +01:00
parent 54bd322881
commit 1aea8f116b
5 changed files with 56 additions and 25 deletions
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7
Libraries/LibHTML/Layout/LayoutDocument.cpp
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@ -34,11 +34,8 @@ void LayoutDocument::layout()
void LayoutDocument::did_set_viewport_rect(Badge<Frame>, const Rect& a_viewport_rect)
{
FloatRect viewport_rect(a_viewport_rect.x(), a_viewport_rect.y(), a_viewport_rect.width(), a_viewport_rect.height());
for_each_in_subtree([&](auto& layout_node) {
if (is<LayoutImage>(layout_node)) {
auto& image = to<LayoutImage>(layout_node);
const_cast<HTMLImageElement&>(image.node()).set_volatile({}, !viewport_rect.intersects(image.rect()));
}
for_each_in_subtree_of_type<LayoutImage>([&](auto& layout_image) {
const_cast<HTMLImageElement&>(layout_image.node()).set_volatile({}, !viewport_rect.intersects(layout_image.rect()));
return IterationDecision::Continue;
});
}