ca4276db77
This fixes an issue where you'd see black (or ghost) pixels when painting web pages with content smaller than the viewport.
95 lines
3 KiB
C++
95 lines
3 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/Painter.h>
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#include <LibWeb/Dump.h>
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#include <LibWeb/Layout/InitialContainingBlock.h>
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#include <LibWeb/Page/BrowsingContext.h>
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#include <LibWeb/Painting/StackingContext.h>
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namespace Web::Layout {
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InitialContainingBlock::InitialContainingBlock(DOM::Document& document, NonnullRefPtr<CSS::StyleProperties> style)
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: BlockContainer(document, &document, move(style))
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{
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}
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InitialContainingBlock::~InitialContainingBlock()
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{
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}
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void InitialContainingBlock::build_stacking_context_tree()
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{
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if (stacking_context())
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return;
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set_stacking_context(make<StackingContext>(*this, nullptr));
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for_each_in_inclusive_subtree_of_type<Box>([&](Box& box) {
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if (&box == this)
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return IterationDecision::Continue;
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if (!box.establishes_stacking_context()) {
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VERIFY(!box.stacking_context());
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return IterationDecision::Continue;
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}
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auto* parent_context = box.enclosing_stacking_context();
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VERIFY(parent_context);
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box.set_stacking_context(make<StackingContext>(box, parent_context));
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return IterationDecision::Continue;
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});
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}
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void InitialContainingBlock::paint_all_phases(PaintContext& context)
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{
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context.painter().fill_rect(enclosing_int_rect(absolute_rect()), context.palette().base());
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context.painter().translate(-context.viewport_rect().location());
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stacking_context()->paint(context);
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}
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HitTestResult InitialContainingBlock::hit_test(const Gfx::IntPoint& position, HitTestType type) const
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{
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return stacking_context()->hit_test(position, type);
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}
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void InitialContainingBlock::recompute_selection_states()
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{
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SelectionState state = SelectionState::None;
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auto selection = this->selection().normalized();
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for_each_in_inclusive_subtree([&](auto& layout_node) {
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if (!selection.is_valid()) {
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// Everything gets SelectionState::None.
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} else if (&layout_node == selection.start().layout_node && &layout_node == selection.end().layout_node) {
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state = SelectionState::StartAndEnd;
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} else if (&layout_node == selection.start().layout_node) {
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state = SelectionState::Start;
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} else if (&layout_node == selection.end().layout_node) {
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state = SelectionState::End;
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} else {
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if (state == SelectionState::Start)
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state = SelectionState::Full;
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else if (state == SelectionState::End || state == SelectionState::StartAndEnd)
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state = SelectionState::None;
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}
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layout_node.set_selection_state(state);
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return IterationDecision::Continue;
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});
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}
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void InitialContainingBlock::set_selection(const LayoutRange& selection)
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{
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m_selection = selection;
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recompute_selection_states();
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}
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void InitialContainingBlock::set_selection_end(const LayoutPosition& position)
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{
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m_selection.set_end(position);
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recompute_selection_states();
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}
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}
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