120 lines
4.9 KiB
C++
120 lines
4.9 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringBuilder.h>
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#include <LibWeb/DOM/Position.h>
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#include <LibWeb/DOM/Range.h>
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#include <LibWeb/DOM/Text.h>
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#include <LibWeb/Layout/LayoutPosition.h>
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#include <LibWeb/Page/Frame.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/Dump.h>
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#include <LibWeb/Layout/InitialContainingBlockBox.h>
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#include "EditEventHandler.h"
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namespace Web {
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// This method is quite convoluted but this is necessary to make editing feel intuitive.
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void EditEventHandler::handle_delete(DOM::Range& range)
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{
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auto* start = downcast<DOM::Text>(range.start_container());
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auto* end = downcast<DOM::Text>(range.end_container());
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if (start == end) {
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StringBuilder builder;
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builder.append(start->data().substring_view(0, range.start_offset()));
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builder.append(end->data().substring_view(range.end_offset()));
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start->set_data(builder.to_string());
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} else {
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// Remove all the nodes that are fully enclosed in the range.
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HashTable<DOM::Node*> queued_for_deletion;
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for (auto* node = start->next_in_pre_order(); node; node = node->next_in_pre_order()) {
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if (node == end)
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break;
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queued_for_deletion.set(node);
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}
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for (auto* parent = start->parent(); parent; parent = parent->parent())
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queued_for_deletion.remove(parent);
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for (auto* parent = end->parent(); parent; parent = parent->parent())
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queued_for_deletion.remove(parent);
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for (auto* node : queued_for_deletion)
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node->parent()->remove_child(*node);
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// Join the parent nodes of start and end.
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DOM::Node *insert_after = start, *remove_from = end, *parent_of_end = end->parent();
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while (remove_from) {
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auto* next_sibling = remove_from->next_sibling();
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remove_from->parent()->remove_child(*remove_from);
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insert_after->parent()->insert_before(*remove_from, *insert_after);
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insert_after = remove_from;
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remove_from = next_sibling;
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}
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if (!parent_of_end->has_children()) {
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if (parent_of_end->parent())
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parent_of_end->parent()->remove_child(*parent_of_end);
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}
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// Join the start and end nodes.
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StringBuilder builder;
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builder.append(start->data().substring_view(0, range.start_offset()));
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builder.append(end->data().substring_view(range.end_offset()));
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start->set_data(builder.to_string());
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start->parent()->remove_child(*end);
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}
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// FIXME: When nodes are removed from the DOM, the associated layout nodes become stale and still
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// remain in the layout tree. This has to be fixed, this just causes everything to be recomputed
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// which really hurts performance.
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m_frame.document()->force_layout();
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}
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void EditEventHandler::handle_insert(DOM::Position position, u32 code_point)
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{
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if (is<DOM::Text>(*position.node())) {
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auto& node = downcast<DOM::Text>(*position.node());
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StringBuilder builder;
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builder.append(node.data().substring_view(0, position.offset()));
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builder.append_code_point(code_point);
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builder.append(node.data().substring_view(position.offset()));
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node.set_data(builder.to_string());
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node.invalidate_style();
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}
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// FIXME: When nodes are removed from the DOM, the associated layout nodes become stale and still
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// remain in the layout tree. This has to be fixed, this just causes everything to be recomputed
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// which really hurts performance.
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m_frame.document()->force_layout();
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}
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}
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