mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-05-01 20:17:13 +02:00
3012c0fe72
Replace per-frame heap-allocated RefCounted ScrollFrame objects with a single contiguous Vector<ScrollFrame> inside ScrollState. All frames for a viewport are now stored in one allocation, using type-safe ScrollFrameIndex instead of RefPtr pointers. This reduces allocation churn, improves cache locality, and moves parent-chain traversal (cumulative offset, nearest scrolling ancestor) into ScrollState — similar to how visual context nodes were recently consolidated into AccumulatedVisualContextTree.
597 lines
30 KiB
C++
597 lines
30 KiB
C++
/*
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* Copyright (c) 2023, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2024-2026, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/CSS/PropertyID.h>
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#include <LibWeb/CSS/VisualViewport.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Range.h>
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#include <LibWeb/Layout/TextNode.h>
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#include <LibWeb/Layout/Viewport.h>
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#include <LibWeb/Page/Page.h>
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#include <LibWeb/Painting/AccumulatedVisualContext.h>
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#include <LibWeb/Painting/Blending.h>
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#include <LibWeb/Painting/DevicePixelConverter.h>
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#include <LibWeb/Painting/DisplayListRecorder.h>
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#include <LibWeb/Painting/ResolvedCSSFilter.h>
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#include <LibWeb/Painting/ScrollFrame.h>
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#include <LibWeb/Painting/StackingContext.h>
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#include <LibWeb/Painting/ViewportPaintable.h>
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#include <LibWeb/Selection/Selection.h>
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namespace Web::Painting {
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GC_DEFINE_ALLOCATOR(ViewportPaintable);
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GC::Ref<ViewportPaintable> ViewportPaintable::create(Layout::Viewport const& layout_viewport)
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{
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return layout_viewport.heap().allocate<ViewportPaintable>(layout_viewport);
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}
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ViewportPaintable::ViewportPaintable(Layout::Viewport const& layout_viewport)
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: PaintableWithLines(layout_viewport)
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{
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}
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ViewportPaintable::~ViewportPaintable() = default;
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void ViewportPaintable::reset_for_relayout()
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{
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PaintableWithLines::reset_for_relayout();
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m_scroll_state.clear();
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m_scroll_state_snapshot = {};
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m_needs_to_refresh_scroll_state = true;
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m_paintable_boxes_with_auto_content_visibility.clear();
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m_visual_context_tree = nullptr;
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m_visual_viewport_context_index = {};
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}
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void ViewportPaintable::build_stacking_context_tree_if_needed()
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{
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if (stacking_context())
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return;
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build_stacking_context_tree();
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}
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void ViewportPaintable::build_stacking_context_tree()
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{
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set_stacking_context(heap().allocate<StackingContext>(*this, nullptr, 0));
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size_t index_in_tree_order = 1;
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for_each_in_subtree_of_type<PaintableBox>([&](auto& paintable_box) {
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paintable_box.invalidate_stacking_context();
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auto* parent_context = paintable_box.enclosing_stacking_context();
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auto establishes_stacking_context = paintable_box.layout_node().establishes_stacking_context();
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if ((paintable_box.is_positioned() || establishes_stacking_context) && paintable_box.computed_values().z_index().value_or(0) == 0)
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parent_context->m_positioned_descendants_and_stacking_contexts_with_stack_level_0.append(paintable_box);
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if (!paintable_box.is_positioned() && paintable_box.is_floating())
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parent_context->m_non_positioned_floating_descendants.append(paintable_box);
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if (!establishes_stacking_context) {
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VERIFY(!paintable_box.stacking_context());
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return TraversalDecision::Continue;
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}
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VERIFY(parent_context);
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paintable_box.set_stacking_context(heap().allocate<StackingContext>(paintable_box, parent_context, index_in_tree_order++));
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return TraversalDecision::Continue;
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});
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stacking_context()->sort();
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}
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void ViewportPaintable::paint_all_phases(DisplayListRecordingContext& context)
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{
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build_stacking_context_tree_if_needed();
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context.display_list_recorder().save_layer();
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stacking_context()->paint(context);
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context.display_list_recorder().restore();
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}
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void ViewportPaintable::assign_scroll_frames()
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{
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auto precompute_sticky_constraints = [&](ScrollFrameIndex sticky_frame_index, PaintableBox const& paintable_box) {
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auto nearest_scrolling_ancestor_index = m_scroll_state.nearest_scrolling_ancestor(sticky_frame_index);
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if (!nearest_scrolling_ancestor_index.value())
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return;
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auto const& scroll_ancestor_paintable = m_scroll_state.frame_at(nearest_scrolling_ancestor_index).paintable_box();
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auto sticky_border_box_rect = paintable_box.absolute_border_box_rect();
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auto const* containing_block_of_sticky = paintable_box.containing_block();
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CSSPixelRect containing_block_region;
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bool needs_parent_offset_adjustment = false;
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if (containing_block_of_sticky == &scroll_ancestor_paintable) {
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containing_block_region = { {}, containing_block_of_sticky->scrollable_overflow_rect()->size() };
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} else {
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containing_block_region = containing_block_of_sticky->absolute_border_box_rect()
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.translated(-scroll_ancestor_paintable.absolute_rect().top_left());
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needs_parent_offset_adjustment = true;
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}
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m_scroll_state.frame_at(sticky_frame_index).set_sticky_constraints({
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.position_relative_to_scroll_ancestor = sticky_border_box_rect.top_left() - scroll_ancestor_paintable.absolute_rect().top_left(),
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.border_box_size = sticky_border_box_rect.size(),
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.scrollport_size = scroll_ancestor_paintable.absolute_rect().size(),
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.containing_block_region = containing_block_region,
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.needs_parent_offset_adjustment = needs_parent_offset_adjustment,
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.insets = paintable_box.sticky_insets(),
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});
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};
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for_each_in_inclusive_subtree_of_type<PaintableBox>([&](auto& paintable_box) {
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ScrollFrameIndex sticky_scroll_frame_index;
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if (paintable_box.is_sticky_position()) {
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auto parent_index = paintable_box.nearest_scroll_frame_index();
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sticky_scroll_frame_index = m_scroll_state.create_sticky_frame_for(paintable_box, parent_index);
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precompute_sticky_constraints(sticky_scroll_frame_index, paintable_box);
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paintable_box.set_enclosing_scroll_frame_index(sticky_scroll_frame_index);
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paintable_box.set_own_scroll_frame_index(sticky_scroll_frame_index);
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}
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if (paintable_box.has_scrollable_overflow() || is<ViewportPaintable>(paintable_box)) {
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ScrollFrameIndex parent_index;
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if (sticky_scroll_frame_index.value()) {
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parent_index = sticky_scroll_frame_index;
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} else {
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parent_index = paintable_box.nearest_scroll_frame_index();
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}
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auto scroll_frame_index = m_scroll_state.create_scroll_frame_for(paintable_box, parent_index);
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paintable_box.set_own_scroll_frame_index(scroll_frame_index);
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}
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return TraversalDecision::Continue;
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});
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for_each_in_subtree([&](auto& paintable) {
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if (paintable.is_fixed_position() || paintable.is_sticky_position())
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return TraversalDecision::Continue;
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for (auto block = paintable.containing_block(); block; block = block->containing_block()) {
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if (auto index = block->own_scroll_frame_index(); index.value()) {
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if (auto* paintable_box = as_if<PaintableBox>(paintable))
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paintable_box->set_enclosing_scroll_frame_index(index);
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return TraversalDecision::Continue;
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}
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if (block->is_fixed_position()) {
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return TraversalDecision::Continue;
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}
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}
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VERIFY_NOT_REACHED();
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});
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}
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static CSSPixelRect effective_css_clip_rect(CSSPixelRect const& css_clip)
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{
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if (css_clip.width() < 0 || css_clip.height() < 0)
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return CSSPixelRect { 0, 0, 0, 0 };
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return css_clip;
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}
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// Converts a CSS-pixel-space 4x4 matrix to device-pixel-space.
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// - Translation column (column 3, rows 0-2) is scaled up by DPR
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// - Perspective row (row 3, columns 0-2) is scaled down by DPR
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// - All other elements are unaffected (the scale factors cancel out)
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static FloatMatrix4x4 scale_matrix_for_device_pixels(FloatMatrix4x4 matrix, float scale)
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{
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matrix[0, 3] *= scale;
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matrix[1, 3] *= scale;
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matrix[2, 3] *= scale;
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matrix[3, 0] /= scale;
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matrix[3, 1] /= scale;
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matrix[3, 2] /= scale;
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return matrix;
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}
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static Optional<TransformData> compute_transform(PaintableBox const& paintable_box, CSS::ComputedValues const& computed_values, double pixel_ratio)
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{
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if (!paintable_box.has_css_transform())
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return {};
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auto matrix = Gfx::FloatMatrix4x4::identity();
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if (auto const& translate = computed_values.translate())
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matrix = matrix * translate->to_matrix(paintable_box).release_value();
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if (auto const& rotate = computed_values.rotate())
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matrix = matrix * rotate->to_matrix(paintable_box).release_value();
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if (auto const& scale = computed_values.scale())
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matrix = matrix * scale->to_matrix(paintable_box).release_value();
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for (auto const& transform : computed_values.transformations())
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matrix = matrix * transform->to_matrix(paintable_box).release_value();
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auto const& css_transform_origin = computed_values.transform_origin();
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auto reference_box = paintable_box.transform_reference_box();
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CSSPixelPoint origin {
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reference_box.left() + css_transform_origin.x.to_px(paintable_box.layout_node(), reference_box.width()),
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reference_box.top() + css_transform_origin.y.to_px(paintable_box.layout_node(), reference_box.height()),
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};
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auto scale = static_cast<float>(pixel_ratio);
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auto device_origin = origin.to_type<float>() * scale;
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return TransformData { scale_matrix_for_device_pixels(matrix, scale), device_origin };
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}
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// https://drafts.csswg.org/css-transforms-2/#perspective-matrix
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static Optional<Gfx::FloatMatrix4x4> compute_perspective_matrix(PaintableBox const& paintable_box, CSS::ComputedValues const& computed_values)
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{
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auto perspective = computed_values.perspective();
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if (!perspective.has_value())
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return {};
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// The perspective matrix is computed as follows:
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// 1. Start with the identity matrix.
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// 2. Translate by the computed X and Y values of 'perspective-origin'
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// https://drafts.csswg.org/css-transforms-2/#perspective-origin-property
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// Percentages: refer to the size of the reference box
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auto reference_box = paintable_box.transform_reference_box();
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auto perspective_origin = computed_values.perspective_origin().resolved(paintable_box.layout_node(), reference_box);
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auto computed_x = perspective_origin.x().to_float();
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auto computed_y = perspective_origin.y().to_float();
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auto perspective_matrix = Gfx::translation_matrix(Vector3<float>(computed_x, computed_y, 0));
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// 3. Multiply by the matrix that would be obtained from the 'perspective()' transform function, where the
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// length is provided by the value of the perspective property
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// NB: Length values less than 1px being clamped to 1px is handled by the perspective() function already.
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// FIXME: Create the matrix directly.
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perspective_matrix = perspective_matrix * CSS::TransformationStyleValue::create(CSS::PropertyID::Transform, CSS::TransformFunction::Perspective, CSS::StyleValueVector { CSS::LengthStyleValue::create(CSS::Length::make_px(perspective.value())) })->to_matrix({}).release_value();
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// 4. Translate by the negated computed X and Y values of 'perspective-origin'
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perspective_matrix = perspective_matrix * Gfx::translation_matrix(Vector3<float>(-computed_x, -computed_y, 0));
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return perspective_matrix;
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}
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static Optional<ClipData> compute_clip_data(PaintableBox const& paintable_box, CSS::ComputedValues const& computed_values, DevicePixelConverter const& converter)
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{
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auto overflow_x = computed_values.overflow_x();
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auto overflow_y = computed_values.overflow_y();
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// https://drafts.csswg.org/css-contain-2/#paint-containment
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// 1. The contents of the element including any ink or scrollable overflow must be clipped to the overflow clip
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// edge of the paint containment box, taking corner clipping into account. This does not include the creation of
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// any mechanism to access or indicate the presence of the clipped content; nor does it inhibit the creation of
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// any such mechanism through other properties, such as overflow, resize, or text-overflow.
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// NOTE: This clipping shape respects overflow-clip-margin, allowing an element with paint containment
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// to still slightly overflow its normal bounds.
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if (paintable_box.layout_node().has_paint_containment()) {
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// NOTE: Note: The behavior is described in this paragraph is equivalent to changing 'overflow-x: visible' into
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// 'overflow-x: clip' and 'overflow-y: visible' into 'overflow-y: clip' at used value time, while leaving other
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// values of 'overflow-x' and 'overflow-y' unchanged.
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overflow_x = CSS::Overflow::Clip;
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overflow_y = CSS::Overflow::Clip;
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}
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auto has_hidden_overflow = overflow_x != CSS::Overflow::Visible || overflow_y != CSS::Overflow::Visible;
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if (has_hidden_overflow && paintable_box.overflow_property_applies()) {
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auto clip_rect = paintable_box.absolute_padding_box_rect();
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// https://drafts.csswg.org/css-overflow-3/#propdef-overflow
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// 'clip'
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// This value indicates that the box’s content is clipped to its overflow clip edge
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auto overflow_clip_edge = paintable_box.overflow_clip_edge_rect();
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if (overflow_x == CSS::Overflow::Visible) {
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clip_rect.set_left(0);
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clip_rect.set_right(CSSPixels::max_integer_value);
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} else if (overflow_x == CSS::Overflow::Clip) {
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clip_rect.set_left(overflow_clip_edge.left());
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clip_rect.set_right(overflow_clip_edge.right());
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}
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if (overflow_y == CSS::Overflow::Visible) {
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clip_rect.set_top(0);
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clip_rect.set_bottom(CSSPixels::max_integer_value);
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} else if (overflow_y == CSS::Overflow::Clip) {
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clip_rect.set_top(overflow_clip_edge.top());
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clip_rect.set_bottom(overflow_clip_edge.bottom());
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}
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// https://drafts.csswg.org/css-overflow-3/#corner-clipping
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// As mentioned in CSS Backgrounds 3 § 4.3 Corner Clipping, the clipping region established by 'overflow' can be
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// rounded:
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// - When 'overflow-x' and 'overflow-y' compute to 'hidden', 'scroll', or 'auto', the clipping region is rounded
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// based on the border radius, adjusted to the padding edge, as described in CSS Backgrounds 3 § 4.2 Corner
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// Shaping.
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// - When both 'overflow-x' and 'overflow-y' compute to 'clip', the clipping region is rounded as described in § 3.2
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// Expanding Clipping Bounds: the 'overflow-clip-margin' property.
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// - However, when one of 'overflow-x' or 'overflow-y' computes to 'clip' and the other computes to 'visible', the
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// clipping region is not rounded.
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// FIXME: Adjust the border radii for the overflow-clip-margin case. (see https://drafts.csswg.org/css-overflow-4/#valdef-overflow-clip-margin-length-0 )
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auto radii = (overflow_x != CSS::Overflow::Visible && overflow_y != CSS::Overflow::Visible) ? paintable_box.normalized_border_radii_data(PaintableBox::ShrinkRadiiForBorders::Yes) : BorderRadiiData {};
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return ClipData { converter.rounded_device_rect(clip_rect), radii.as_corners(converter) };
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}
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return {};
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}
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void ViewportPaintable::assign_accumulated_visual_contexts()
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{
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m_visual_context_tree = AccumulatedVisualContextTree::create();
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auto pixel_ratio = document().page().client().device_pixels_per_css_pixel();
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DevicePixelConverter converter { pixel_ratio };
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auto scale = static_cast<float>(pixel_ratio);
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auto append_node = [&](VisualContextIndex parent_index, VisualContextData data) -> VisualContextIndex {
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return m_visual_context_tree->append(move(data), parent_index);
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};
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auto make_effects_data = [&](PaintableBox const& box) -> Optional<EffectsData> {
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auto const& computed_values = box.computed_values();
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auto gfx_filter = to_gfx_filter(box.filter(), pixel_ratio);
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EffectsData effects {
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computed_values.opacity(),
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mix_blend_mode_to_compositing_and_blending_operator(computed_values.mix_blend_mode()),
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move(gfx_filter)
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};
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if (!effects.needs_layer())
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return {};
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return effects;
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};
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// Create visual viewport transform as root (if not identity)
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m_visual_viewport_context_index = {};
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auto transform = document().visual_viewport()->transform();
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if (!transform.is_identity()) {
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auto matrix = scale_matrix_for_device_pixels(transform.to_matrix(), scale);
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m_visual_viewport_context_index = append_node({}, TransformData { matrix, { 0.f, 0.f } });
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}
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VisualContextIndex viewport_state_for_descendants = m_visual_viewport_context_index;
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if (own_scroll_frame_index().value())
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viewport_state_for_descendants = append_node(m_visual_viewport_context_index, ScrollData { own_scroll_frame_index(), false });
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set_accumulated_visual_context({});
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set_accumulated_visual_context_for_descendants(viewport_state_for_descendants);
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for_each_in_subtree_of_type<PaintableBox>([&](auto& paintable_box) {
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auto* visual_parent = as_if<PaintableBox>(paintable_box.parent());
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if (!visual_parent)
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return TraversalDecision::Continue;
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// Resolve filters before make_effects_data reads them.
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auto const& paintable_box_computed_values = paintable_box.computed_values();
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if (paintable_box_computed_values.filter().has_filters())
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paintable_box.set_filter(resolve_css_filter(paintable_box_computed_values.filter(), paintable_box));
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else
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paintable_box.set_filter({});
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VisualContextIndex inherited_state;
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if (paintable_box.is_fixed_position()) {
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inherited_state = m_visual_viewport_context_index;
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} else if (paintable_box.is_absolutely_positioned()) {
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// For position: absolute, use containing block's state to correctly escape scroll containers.
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auto* containing = paintable_box.containing_block();
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inherited_state = containing->accumulated_visual_context_for_descendants_index();
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// Abspos elements escape scroll containers and overflow clips of non-positioned
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// ancestors, but cannot escape stacking contexts created by intermediate effects
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// (opacity, mix-blend-mode, isolation). Walk from visual parent to containing
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// block and collect these intermediate effects.
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// NOTE: transforms/perspectives/filters establish containing blocks for abspos,
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// so they cannot appear as intermediates.
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Vector<VisualContextData, 4> intermediate_effects;
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for (Paintable* paintable = visual_parent; paintable && paintable != containing; paintable = paintable->parent()) {
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auto* ancestor_box = as_if<PaintableBox>(paintable);
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if (!ancestor_box)
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continue;
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if (auto effects = make_effects_data(*ancestor_box); effects.has_value())
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intermediate_effects.append(effects.release_value());
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}
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for (auto& effects : intermediate_effects.in_reverse())
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inherited_state = append_node(inherited_state, move(effects));
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} else {
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// For position: relative/static, use visual parent's state directly.
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// This avoids duplicate transform/perspective allocations that would occur with
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// the containing block + intermediate walk approach.
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inherited_state = visual_parent->accumulated_visual_context_for_descendants_index();
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}
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// Build this element's own state from inherited state.
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VisualContextIndex own_state = inherited_state;
|
||
|
||
if (paintable_box.is_sticky_position()) {
|
||
// For sticky elements, use enclosing_scroll_frame which holds the sticky frame.
|
||
// own_scroll_frame may be a different scroll frame if the sticky element also has scrollable overflow.
|
||
if (auto sticky_idx = paintable_box.enclosing_scroll_frame_index(); sticky_idx.value() && m_scroll_state.frame_at(sticky_idx).is_sticky())
|
||
own_state = append_node(own_state, ScrollData { sticky_idx, true });
|
||
}
|
||
|
||
auto const& computed_values = paintable_box.computed_values();
|
||
|
||
if (auto effects = make_effects_data(paintable_box); effects.has_value())
|
||
own_state = append_node(own_state, effects.release_value());
|
||
|
||
if (auto transform_data = compute_transform(paintable_box, computed_values, pixel_ratio); transform_data.has_value()) {
|
||
paintable_box.set_has_non_invertible_css_transform(!transform_data->matrix.is_invertible());
|
||
own_state = append_node(own_state, *transform_data);
|
||
} else {
|
||
paintable_box.set_has_non_invertible_css_transform(false);
|
||
}
|
||
|
||
if (auto css_clip = paintable_box.get_clip_rect(); css_clip.has_value()) {
|
||
auto effective_rect = effective_css_clip_rect(*css_clip);
|
||
own_state = append_node(own_state, ClipData { converter.rounded_device_rect(effective_rect), {} });
|
||
}
|
||
|
||
// FIXME: Support other geometry boxes. See: https://drafts.fxtf.org/css-masking/#typedef-geometry-box
|
||
if (auto const& clip_path = computed_values.clip_path(); clip_path.has_value() && clip_path->is_basic_shape()) {
|
||
auto masking_area = paintable_box.absolute_border_box_rect();
|
||
auto reference_box = CSSPixelRect { {}, masking_area.size() };
|
||
auto const& basic_shape = clip_path->basic_shape();
|
||
auto path = basic_shape.to_path(reference_box, paintable_box.layout_node());
|
||
path.offset(masking_area.top_left().template to_type<float>());
|
||
auto fill_rule = basic_shape.basic_shape().visit(
|
||
[](CSS::Polygon const& polygon) { return polygon.fill_rule; },
|
||
[](CSS::Path const& path) { return path.fill_rule; },
|
||
[](auto const&) { return Gfx::WindingRule::Nonzero; });
|
||
auto device_path = path.copy_transformed(Gfx::AffineTransform {}.set_scale(scale, scale));
|
||
auto device_bounding_rect = converter.rounded_device_rect(masking_area);
|
||
own_state = append_node(own_state, ClipPathData { move(device_path), device_bounding_rect, fill_rule });
|
||
}
|
||
|
||
paintable_box.set_accumulated_visual_context(own_state);
|
||
|
||
// Build state for descendants: own state + perspective + clip + scroll.
|
||
VisualContextIndex state_for_descendants = own_state;
|
||
|
||
if (auto perspective_matrix = compute_perspective_matrix(paintable_box, computed_values); perspective_matrix.has_value()) {
|
||
auto scaled_matrix = scale_matrix_for_device_pixels(*perspective_matrix, scale);
|
||
state_for_descendants = append_node(state_for_descendants, PerspectiveData { scaled_matrix });
|
||
}
|
||
|
||
if (auto clip_data = compute_clip_data(paintable_box, computed_values, converter); clip_data.has_value())
|
||
state_for_descendants = append_node(state_for_descendants, clip_data.value());
|
||
|
||
if (paintable_box.own_scroll_frame_index().value()) {
|
||
auto is_sticky_without_scrollable_overflow = paintable_box.is_sticky_position() && paintable_box.enclosing_scroll_frame_index() == paintable_box.own_scroll_frame_index();
|
||
if (!is_sticky_without_scrollable_overflow)
|
||
state_for_descendants = append_node(state_for_descendants, ScrollData { paintable_box.own_scroll_frame_index(), false });
|
||
}
|
||
|
||
paintable_box.set_accumulated_visual_context_for_descendants(state_for_descendants);
|
||
|
||
return TraversalDecision::Continue;
|
||
});
|
||
}
|
||
|
||
void ViewportPaintable::refresh_scroll_state()
|
||
{
|
||
if (!m_needs_to_refresh_scroll_state)
|
||
return;
|
||
m_needs_to_refresh_scroll_state = false;
|
||
|
||
m_scroll_state.for_each_sticky_frame([&](auto idx, auto& frame) {
|
||
auto nearest_scrolling_ancestor_index = m_scroll_state.nearest_scrolling_ancestor(idx);
|
||
if (!nearest_scrolling_ancestor_index.value() || !frame.has_sticky_constraints())
|
||
return;
|
||
|
||
auto const& sticky_data = frame.sticky_constraints();
|
||
auto const& sticky_insets = sticky_data.insets;
|
||
auto const& scroll_ancestor_paintable = m_scroll_state.frame_at(nearest_scrolling_ancestor_index).paintable_box();
|
||
|
||
// For nested sticky elements, the parent sticky's offset is applied via cumulative_offset.
|
||
// We need to adjust all position calculations to account for this, so we work in the
|
||
// coordinate space where the parent sticky is at its current (offset) position.
|
||
CSSPixelPoint parent_sticky_offset;
|
||
if (auto parent_idx = frame.parent_index(); parent_idx.value() && m_scroll_state.frame_at(parent_idx).is_sticky())
|
||
parent_sticky_offset = m_scroll_state.cumulative_offset(parent_idx);
|
||
|
||
auto sticky_position_in_ancestor = sticky_data.position_relative_to_scroll_ancestor + parent_sticky_offset;
|
||
|
||
auto containing_block_region = sticky_data.containing_block_region;
|
||
if (sticky_data.needs_parent_offset_adjustment)
|
||
containing_block_region.translate_by(parent_sticky_offset);
|
||
CSSPixelPoint min_offset_within_containing_block = containing_block_region.top_left();
|
||
CSSPixelPoint max_offset_within_containing_block = {
|
||
containing_block_region.right() - sticky_data.border_box_size.width(),
|
||
containing_block_region.bottom() - sticky_data.border_box_size.height()
|
||
};
|
||
|
||
CSSPixelRect scrollport_rect { scroll_ancestor_paintable.scroll_offset(), sticky_data.scrollport_size };
|
||
CSSPixelPoint sticky_offset;
|
||
|
||
if (sticky_insets.top.has_value()) {
|
||
if (scrollport_rect.top() > sticky_position_in_ancestor.y() - *sticky_insets.top)
|
||
sticky_offset.set_y(min(scrollport_rect.top() + *sticky_insets.top, max_offset_within_containing_block.y()) - sticky_position_in_ancestor.y());
|
||
}
|
||
if (sticky_insets.left.has_value()) {
|
||
if (scrollport_rect.left() > sticky_position_in_ancestor.x() - *sticky_insets.left)
|
||
sticky_offset.set_x(min(scrollport_rect.left() + *sticky_insets.left, max_offset_within_containing_block.x()) - sticky_position_in_ancestor.x());
|
||
}
|
||
if (sticky_insets.bottom.has_value()) {
|
||
if (scrollport_rect.bottom() < sticky_position_in_ancestor.y() + sticky_data.border_box_size.height() + *sticky_insets.bottom)
|
||
sticky_offset.set_y(max(scrollport_rect.bottom() - sticky_data.border_box_size.height() - *sticky_insets.bottom, min_offset_within_containing_block.y()) - sticky_position_in_ancestor.y());
|
||
}
|
||
if (sticky_insets.right.has_value()) {
|
||
if (scrollport_rect.right() < sticky_position_in_ancestor.x() + sticky_data.border_box_size.width() + *sticky_insets.right)
|
||
sticky_offset.set_x(max(scrollport_rect.right() - sticky_data.border_box_size.width() - *sticky_insets.right, min_offset_within_containing_block.x()) - sticky_position_in_ancestor.x());
|
||
}
|
||
|
||
frame.set_own_offset(sticky_offset);
|
||
});
|
||
|
||
m_scroll_state.for_each_scroll_frame([&](auto, auto& frame) {
|
||
frame.set_own_offset(-frame.paintable_box().scroll_offset());
|
||
});
|
||
|
||
m_scroll_state_snapshot = m_scroll_state.snapshot(document().page().client().device_pixels_per_css_pixel());
|
||
}
|
||
|
||
GC::Ptr<Selection::Selection> ViewportPaintable::selection() const
|
||
{
|
||
return document().get_selection();
|
||
}
|
||
|
||
void ViewportPaintable::recompute_selection_states(DOM::Range& range)
|
||
{
|
||
// 1. Start by resetting the selection state of all layout nodes to None.
|
||
for_each_in_inclusive_subtree([&](auto& layout_node) {
|
||
layout_node.set_selection_state(SelectionState::None);
|
||
return TraversalDecision::Continue;
|
||
});
|
||
|
||
auto start_container = range.start_container();
|
||
auto end_container = range.end_container();
|
||
|
||
// 2. If the selection starts and ends in the same node:
|
||
if (start_container == end_container) {
|
||
// 1. If the selection starts and ends at the same offset, return.
|
||
if (range.start_offset() == range.end_offset()) {
|
||
// NOTE: A zero-length selection should not be visible.
|
||
return;
|
||
}
|
||
|
||
// 2. If it's a text node, mark it as StartAndEnd and return.
|
||
if (is<DOM::Text>(*start_container) && !range.start().node->is_inert()) {
|
||
if (auto* paintable = start_container->unsafe_paintable())
|
||
paintable->set_selection_state(SelectionState::StartAndEnd);
|
||
return;
|
||
}
|
||
}
|
||
|
||
// 3. Mark the selection start node as Start (if text) or Full (if anything else).
|
||
if (auto* paintable = start_container->unsafe_paintable(); paintable && !range.start().node->is_inert()) {
|
||
if (is<DOM::Text>(*start_container))
|
||
paintable->set_selection_state(SelectionState::Start);
|
||
else
|
||
paintable->set_selection_state(SelectionState::Full);
|
||
}
|
||
|
||
// 4. Mark the nodes between the start and end of the selection as Full.
|
||
auto* start_at = start_container->child_at_index(range.start_offset());
|
||
// If the start container has no child at that index, we need to start on the node right after the start container.
|
||
if (!start_at) {
|
||
if (auto* last_child = start_container->last_child()) {
|
||
start_at = last_child->next_in_pre_order();
|
||
} else {
|
||
start_at = start_container->next_in_pre_order();
|
||
}
|
||
}
|
||
|
||
DOM::Node* stop_at = end_container->child_at_index(range.end_offset());
|
||
// Only stop at the end container if it has no children that may need to be included.
|
||
for (auto* node = start_at; node && (node != stop_at && !(node == end_container && !end_container->has_children())); node = node->next_in_pre_order(end_container)) {
|
||
if (node->is_inert())
|
||
continue;
|
||
if (auto* paintable = node->unsafe_paintable())
|
||
paintable->set_selection_state(SelectionState::Full);
|
||
}
|
||
|
||
// 5. Mark the selection end node as End if it is a text node.
|
||
if (auto* paintable = end_container->unsafe_paintable(); paintable && !range.end().node->is_inert() && is<DOM::Text>(*end_container)) {
|
||
paintable->set_selection_state(SelectionState::End);
|
||
}
|
||
}
|
||
|
||
bool ViewportPaintable::handle_mousewheel(Badge<EventHandler>, CSSPixelPoint, unsigned, unsigned, int, int)
|
||
{
|
||
return false;
|
||
}
|
||
|
||
void ViewportPaintable::visit_edges(Visitor& visitor)
|
||
{
|
||
Base::visit_edges(visitor);
|
||
visitor.visit(m_paintable_boxes_with_auto_content_visibility);
|
||
}
|
||
|
||
}
|