mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 00:52:43 +00:00
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
/*
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* Copyright (c) 2018-2023, 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 <LibWeb/DOM/Range.h>
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#include <LibWeb/Dump.h>
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#include <LibWeb/Layout/Viewport.h>
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#include <LibWeb/Painting/PaintableBox.h>
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#include <LibWeb/Painting/StackingContext.h>
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#include <LibWeb/Painting/ViewportPaintable.h>
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namespace Web::Layout {
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Viewport::Viewport(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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Viewport::~Viewport() = default;
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JS::GCPtr<Selection::Selection> Viewport::selection() const
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{
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return const_cast<DOM::Document&>(document()).get_selection();
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}
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void Viewport::recompute_selection_states()
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{
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// 1. Start by resetting the selection state of all layout nodes to None.
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for_each_in_inclusive_subtree([&](auto& layout_node) {
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layout_node.set_selection_state(SelectionState::None);
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return IterationDecision::Continue;
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});
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// 2. If there is no active Selection or selected Range, return.
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auto selection = document().get_selection();
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if (!selection)
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return;
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auto range = selection->range();
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if (!range)
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return;
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auto* start_container = range->start_container();
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auto* end_container = range->end_container();
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// 3. If the selection starts and ends in the same node:
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if (start_container == end_container) {
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// 1. If the selection starts and ends at the same offset, return.
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if (range->start_offset() == range->end_offset()) {
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// NOTE: A zero-length selection should not be visible.
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return;
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}
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// 2. If it's a text node, mark it as StartAndEnd and return.
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if (is<DOM::Text>(*start_container)) {
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if (auto* layout_node = start_container->layout_node()) {
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layout_node->set_selection_state(SelectionState::StartAndEnd);
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}
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return;
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}
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}
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if (start_container == end_container && is<DOM::Text>(*start_container)) {
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if (auto* layout_node = start_container->layout_node()) {
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layout_node->set_selection_state(SelectionState::StartAndEnd);
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}
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return;
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}
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// 4. Mark the selection start node as Start (if text) or Full (if anything else).
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if (auto* layout_node = start_container->layout_node()) {
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if (is<DOM::Text>(*start_container))
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layout_node->set_selection_state(SelectionState::Start);
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else
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layout_node->set_selection_state(SelectionState::Full);
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}
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// 5. Mark the selection end node as End (if text) or Full (if anything else).
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if (auto* layout_node = end_container->layout_node()) {
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if (is<DOM::Text>(*end_container))
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layout_node->set_selection_state(SelectionState::End);
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else
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layout_node->set_selection_state(SelectionState::Full);
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}
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// 6. Mark the nodes between start node and end node (in tree order) as Full.
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for (auto* node = start_container->next_in_pre_order(); node && node != end_container; node = node->next_in_pre_order()) {
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if (auto* layout_node = node->layout_node())
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layout_node->set_selection_state(SelectionState::Full);
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}
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}
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JS::GCPtr<Painting::Paintable> Viewport::create_paintable() const
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{
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return Painting::ViewportPaintable::create(*this);
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}
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}
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