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