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LibHTML: Implement the <blink> element

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Just in time for Serenity's 1st birthday, here is the <blink> element!

This patch adds a bunch of different mechanisms to enable partial
repaints of the layout tree (LayoutNode::set_needs_display()))
It also adds LayoutNode::is_visible(), which can be toggled to prevent
a LayoutNode from rendering anything (it still takes up space though.)
This commit is contained in:
Andreas Kling 2019-10-09 21:25:29 +02:00
parent 33043941f9
commit fdbad6284c
16 changed files with 140 additions and 0 deletions
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22
Libraries/LibHTML/Layout/LayoutNode.cpp
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@ -1,6 +1,7 @@
#include <LibGUI/GPainter.h>
#include <LibHTML/DOM/Document.h>
#include <LibHTML/DOM/Element.h>
#include <LibHTML/Frame.h>
#include <LibHTML/Layout/LayoutBlock.h>
#include <LibHTML/Layout/LayoutNode.h>
@ -38,6 +39,9 @@ const LayoutBlock* LayoutNode::containing_block() const
void LayoutNode::render(RenderingContext& context)
{
if (!is_visible())
return;
#ifdef DRAW_BOXES_AROUND_LAYOUT_NODES
context.painter().draw_rect(m_rect, Color::Blue);
#endif
@ -127,3 +131,21 @@ void LayoutNode::split_into_lines(LayoutBlock& container)
}
});
}
void LayoutNode::set_needs_display()
{
auto* frame = document().frame();
ASSERT(frame);
if (!is_inline()) {
const_cast<Frame*>(frame)->set_needs_display(rect());
return;
}
for_each_fragment_of_this([&](auto& fragment) {
if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
const_cast<Frame*>(frame)->set_needs_display(fragment.rect());
}
return IterationDecision::Continue;
});
}