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a4d51b3dc2
The "paintable" state in Layout::Box was actually not safe to access until after layout had been performed. As a first step towards making this harder to mess up accidentally, this patch moves painting information from Layout::Box to a new class: Painting::Box. Every layout can have a corresponding paint box, and it holds the final used metrics determined by layout. The paint box is created and populated by FormattingState::commit(). I've also added DOM::Node::paint_box() as a convenient way to access the paint box (if available) of a given DOM node. Going forward, I believe this will allow us to better separate data that belongs to layout vs painting, and also open up opportunities for naturally invalidating caches in the paint box (since it's reconstituted by every layout.)
135 lines
4.5 KiB
C++
135 lines
4.5 KiB
C++
/*
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* Copyright (c) 2018-2022, 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/BlockContainer.h>
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#include <LibWeb/Layout/InitialContainingBlock.h>
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#include <LibWeb/Layout/InlineFormattingContext.h>
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#include <LibWeb/Layout/ReplacedBox.h>
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#include <LibWeb/Layout/TextNode.h>
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#include <LibWeb/Painting/Box.h>
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namespace Web::Layout {
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BlockContainer::BlockContainer(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
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: Box(document, node, move(style))
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{
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}
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BlockContainer::BlockContainer(DOM::Document& document, DOM::Node* node, CSS::ComputedValues computed_values)
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: Box(document, node, move(computed_values))
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{
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}
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BlockContainer::~BlockContainer()
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{
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}
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bool BlockContainer::should_clip_overflow() const
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{
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return computed_values().overflow_x() != CSS::Overflow::Visible && computed_values().overflow_y() != CSS::Overflow::Visible;
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}
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void BlockContainer::paint(PaintContext& context, PaintPhase phase)
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{
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if (!is_visible())
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return;
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Box::paint(context, phase);
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if (!children_are_inline())
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return;
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if (should_clip_overflow()) {
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context.painter().save();
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// FIXME: Handle overflow-x and overflow-y being different values.
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context.painter().add_clip_rect(enclosing_int_rect(m_paint_box->absolute_padding_box_rect()));
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context.painter().translate(-m_scroll_offset.to_type<int>());
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}
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for (auto& line_box : m_paint_box->m_line_boxes) {
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for (auto& fragment : line_box.fragments()) {
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if (context.should_show_line_box_borders())
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context.painter().draw_rect(enclosing_int_rect(fragment.absolute_rect()), Color::Green);
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fragment.paint(context, phase);
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}
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}
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if (should_clip_overflow()) {
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context.painter().restore();
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}
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// FIXME: Merge this loop with the above somehow..
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if (phase == PaintPhase::FocusOutline) {
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for (auto& line_box : m_paint_box->m_line_boxes) {
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for (auto& fragment : line_box.fragments()) {
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auto* node = fragment.layout_node().dom_node();
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if (!node)
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continue;
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auto* parent = node->parent_element();
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if (!parent)
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continue;
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if (parent->is_focused())
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context.painter().draw_rect(enclosing_int_rect(fragment.absolute_rect()), context.palette().focus_outline());
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}
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}
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}
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}
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HitTestResult BlockContainer::hit_test(const Gfx::IntPoint& position, HitTestType type) const
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{
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if (!children_are_inline())
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return Box::hit_test(position, type);
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HitTestResult last_good_candidate;
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for (auto& line_box : m_paint_box->m_line_boxes) {
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for (auto& fragment : line_box.fragments()) {
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if (is<Box>(fragment.layout_node()) && verify_cast<Box>(fragment.layout_node()).stacking_context())
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continue;
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if (enclosing_int_rect(fragment.absolute_rect()).contains(position)) {
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if (is<BlockContainer>(fragment.layout_node()))
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return verify_cast<BlockContainer>(fragment.layout_node()).hit_test(position, type);
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return { fragment.layout_node(), fragment.text_index_at(position.x()) };
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}
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if (fragment.absolute_rect().top() <= position.y())
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last_good_candidate = { fragment.layout_node(), fragment.text_index_at(position.x()) };
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}
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}
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if (type == HitTestType::TextCursor && last_good_candidate.layout_node)
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return last_good_candidate;
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return { m_paint_box->absolute_border_box_rect().contains(position.x(), position.y()) ? this : nullptr };
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}
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bool BlockContainer::is_scrollable() const
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{
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// FIXME: Support horizontal scroll as well (overflow-x)
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return computed_values().overflow_y() == CSS::Overflow::Scroll;
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}
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void BlockContainer::set_scroll_offset(const Gfx::FloatPoint& 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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return;
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m_scroll_offset = offset;
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set_needs_display();
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}
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bool BlockContainer::handle_mousewheel(Badge<EventHandler>, const Gfx::IntPoint&, unsigned int, unsigned int, int wheel_delta_x, int wheel_delta_y)
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{
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if (!is_scrollable())
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return false;
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auto new_offset = m_scroll_offset;
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new_offset.translate_by(wheel_delta_x, wheel_delta_y);
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set_scroll_offset(new_offset);
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return true;
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}
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}
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