453 lines
16 KiB
C++
453 lines
16 KiB
C++
/*
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* Copyright (c) 2021, 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 <LibGUI/EditingEngine.h>
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#include <LibGUI/Event.h>
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#include <LibGUI/TextEditor.h>
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namespace GUI {
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EditingEngine::~EditingEngine()
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{
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}
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void EditingEngine::attach(TextEditor& editor)
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{
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ASSERT(!m_editor);
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m_editor = editor;
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}
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void EditingEngine::detach()
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{
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ASSERT(m_editor);
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m_editor = nullptr;
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}
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bool EditingEngine::on_key(const KeyEvent& event)
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{
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if (event.key() == KeyCode::Key_Left) {
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if (!event.shift() && m_editor->selection()->is_valid()) {
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m_editor->set_cursor(m_editor->selection()->normalized().start());
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m_editor->selection()->clear();
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m_editor->did_update_selection();
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if (!event.ctrl()) {
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m_editor->update();
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return true;
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}
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}
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if (event.ctrl()) {
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move_to_previous_span(event);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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return true;
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}
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move_one_left(event);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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return true;
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}
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if (event.key() == KeyCode::Key_Right) {
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if (!event.shift() && m_editor->selection()->is_valid()) {
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m_editor->set_cursor(m_editor->selection()->normalized().end());
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m_editor->selection()->clear();
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m_editor->did_update_selection();
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if (!event.ctrl()) {
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m_editor->update();
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return true;
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}
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}
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if (event.ctrl()) {
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move_to_next_span(event);
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return true;
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}
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move_one_right(event);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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return true;
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}
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if (event.key() == KeyCode::Key_Up) {
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move_one_up(event);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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return true;
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}
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if (event.key() == KeyCode::Key_Down) {
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move_one_down(event);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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return true;
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}
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if (event.key() == KeyCode::Key_Home) {
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if (event.ctrl()) {
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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move_to_first_line();
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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} else {
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move_to_line_beginning(event);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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}
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return true;
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}
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if (event.key() == KeyCode::Key_End) {
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if (event.ctrl()) {
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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move_to_last_line();
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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} else {
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move_to_line_end(event);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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}
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return true;
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}
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if (event.key() == KeyCode::Key_PageUp) {
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move_page_up(event);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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return true;
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}
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if (event.key() == KeyCode::Key_PageDown) {
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move_page_down(event);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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return true;
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}
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return false;
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}
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void EditingEngine::move_one_left(const KeyEvent& event)
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{
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if (m_editor->cursor().column() > 0) {
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int new_column = m_editor->cursor().column() - 1;
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(m_editor->cursor().line(), new_column);
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} else if (m_editor->cursor().line() > 0) {
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int new_line = m_editor->cursor().line() - 1;
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int new_column = m_editor->lines()[new_line].length();
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(new_line, new_column);
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}
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}
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void EditingEngine::move_one_right(const KeyEvent& event)
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{
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int new_line = m_editor->cursor().line();
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int new_column = m_editor->cursor().column();
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if (m_editor->cursor().column() < m_editor->current_line().length()) {
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new_line = m_editor->cursor().line();
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new_column = m_editor->cursor().column() + 1;
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} else if (m_editor->cursor().line() != m_editor->line_count() - 1) {
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new_line = m_editor->cursor().line() + 1;
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new_column = 0;
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}
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(new_line, new_column);
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}
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void EditingEngine::move_to_previous_span(const KeyEvent& event)
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{
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TextPosition new_cursor;
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if (m_editor->document().has_spans()) {
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auto span = m_editor->document().first_non_skippable_span_before(m_editor->cursor());
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if (span.has_value()) {
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new_cursor = span.value().range.start();
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} else {
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// No remaining spans, just use word break calculation
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new_cursor = m_editor->document().first_word_break_before(m_editor->cursor(), true);
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}
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} else {
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new_cursor = m_editor->document().first_word_break_before(m_editor->cursor(), true);
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}
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(new_cursor);
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}
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void EditingEngine::move_to_next_span(const KeyEvent& event)
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{
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TextPosition new_cursor;
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if (m_editor->document().has_spans()) {
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auto span = m_editor->document().first_non_skippable_span_after(m_editor->cursor());
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if (span.has_value()) {
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new_cursor = span.value().range.start();
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} else {
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// No remaining spans, just use word break calculation
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new_cursor = m_editor->document().first_word_break_after(m_editor->cursor());
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}
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} else {
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new_cursor = m_editor->document().first_word_break_after(m_editor->cursor());
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}
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(new_cursor);
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if (event.shift() && m_editor->selection()->start().is_valid()) {
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m_editor->selection()->set_end(m_editor->cursor());
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m_editor->did_update_selection();
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}
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}
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void EditingEngine::move_to_line_beginning(const KeyEvent& event)
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{
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TextPosition new_cursor;
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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if (m_editor->is_line_wrapping_enabled()) {
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// FIXME: Replicate the first_nonspace_column behavior in wrapping mode.
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auto home_position = m_editor->cursor_content_rect().location().translated(-m_editor->width(), 0);
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new_cursor = m_editor->text_position_at_content_position(home_position);
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} else {
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size_t first_nonspace_column = m_editor->current_line().first_non_whitespace_column();
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if (m_editor->cursor().column() == first_nonspace_column) {
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new_cursor = { m_editor->cursor().line(), 0 };
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} else {
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new_cursor = { m_editor->cursor().line(), first_nonspace_column };
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}
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}
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m_editor->set_cursor(new_cursor);
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}
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void EditingEngine::move_to_line_end(const KeyEvent& event)
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{
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TextPosition new_cursor;
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if (m_editor->is_line_wrapping_enabled()) {
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auto end_position = m_editor->cursor_content_rect().location().translated(m_editor->width(), 0);
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new_cursor = m_editor->text_position_at_content_position(end_position);
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} else {
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new_cursor = { m_editor->cursor().line(), m_editor->current_line().length() };
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}
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(new_cursor);
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}
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void EditingEngine::move_one_up(const KeyEvent& event)
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{
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if (m_editor->cursor().line() > 0 || m_editor->is_line_wrapping_enabled()) {
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if (event.ctrl() && event.shift()) {
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move_selected_lines_up();
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return;
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}
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TextPosition new_cursor;
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if (m_editor->is_line_wrapping_enabled()) {
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auto position_above = m_editor->cursor_content_rect().location().translated(0, -m_editor->line_height());
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new_cursor = m_editor->text_position_at_content_position(position_above);
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} else {
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size_t new_line = m_editor->cursor().line() - 1;
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size_t new_column = min(m_editor->cursor().column(), m_editor->line(new_line).length());
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new_cursor = { new_line, new_column };
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}
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(new_cursor);
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}
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};
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void EditingEngine::move_one_down(const KeyEvent& event)
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{
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if (m_editor->cursor().line() < (m_editor->line_count() - 1) || m_editor->is_line_wrapping_enabled()) {
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if (event.ctrl() && event.shift()) {
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move_selected_lines_down();
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return;
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}
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TextPosition new_cursor;
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if (m_editor->is_line_wrapping_enabled()) {
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new_cursor = m_editor->text_position_at_content_position(m_editor->cursor_content_rect().location().translated(0, m_editor->line_height()));
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auto position_below = m_editor->cursor_content_rect().location().translated(0, m_editor->line_height());
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new_cursor = m_editor->text_position_at_content_position(position_below);
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} else {
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size_t new_line = m_editor->cursor().line() + 1;
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size_t new_column = min(m_editor->cursor().column(), m_editor->line(new_line).length());
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new_cursor = { new_line, new_column };
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}
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(new_cursor);
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}
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};
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void EditingEngine::move_up(const KeyEvent& event, double page_height_factor)
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{
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if (m_editor->cursor().line() > 0 || m_editor->is_line_wrapping_enabled()) {
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int pixels = (int)(m_editor->visible_content_rect().height() * page_height_factor);
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TextPosition new_cursor;
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if (m_editor->is_line_wrapping_enabled()) {
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auto position_above = m_editor->cursor_content_rect().location().translated(0, -pixels);
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new_cursor = m_editor->text_position_at_content_position(position_above);
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} else {
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size_t page_step = (size_t)pixels / (size_t)m_editor->line_height();
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size_t new_line = m_editor->cursor().line() < page_step ? 0 : m_editor->cursor().line() - page_step;
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size_t new_column = min(m_editor->cursor().column(), m_editor->line(new_line).length());
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new_cursor = { new_line, new_column };
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}
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(new_cursor);
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}
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};
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void EditingEngine::move_down(const KeyEvent& event, double page_height_factor)
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{
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if (m_editor->cursor().line() < (m_editor->line_count() - 1) || m_editor->is_line_wrapping_enabled()) {
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int pixels = (int)(m_editor->visible_content_rect().height() * page_height_factor);
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TextPosition new_cursor;
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if (m_editor->is_line_wrapping_enabled()) {
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auto position_below = m_editor->cursor_content_rect().location().translated(0, pixels);
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new_cursor = m_editor->text_position_at_content_position(position_below);
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} else {
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size_t new_line = min(m_editor->line_count() - 1, m_editor->cursor().line() + pixels / m_editor->line_height());
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size_t new_column = min(m_editor->cursor().column(), m_editor->lines()[new_line].length());
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new_cursor = { new_line, new_column };
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}
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m_editor->toggle_selection_if_needed_for_event(event.shift());
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m_editor->set_cursor(new_cursor);
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};
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}
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void EditingEngine::move_page_up(const KeyEvent& event)
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{
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move_up(event, 1);
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};
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void EditingEngine::move_page_down(const KeyEvent& event)
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{
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move_down(event, 1);
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};
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void EditingEngine::move_to_first_line()
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{
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m_editor->set_cursor(0, 0);
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};
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void EditingEngine::move_to_last_line()
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{
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m_editor->set_cursor(m_editor->line_count() - 1, m_editor->lines()[m_editor->line_count() - 1].length());
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};
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void EditingEngine::get_selection_line_boundaries(size_t& first_line, size_t& last_line)
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{
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auto selection = m_editor->normalized_selection();
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if (!selection.is_valid()) {
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first_line = m_editor->cursor().line();
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last_line = m_editor->cursor().line();
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return;
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}
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first_line = selection.start().line();
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last_line = selection.end().line();
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if (first_line != last_line && selection.end().column() == 0)
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last_line -= 1;
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}
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void EditingEngine::move_selected_lines_up()
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{
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if (!m_editor->is_editable())
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return;
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size_t first_line;
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size_t last_line;
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get_selection_line_boundaries(first_line, last_line);
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if (first_line == 0)
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return;
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auto& lines = m_editor->document().lines();
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lines.insert((int)last_line, lines.take((int)first_line - 1));
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m_editor->set_cursor({ first_line - 1, 0 });
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if (m_editor->has_selection()) {
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m_editor->selection()->set_start({ first_line - 1, 0 });
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m_editor->selection()->set_end({ last_line - 1, m_editor->line(last_line - 1).length() });
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}
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m_editor->did_change();
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m_editor->update();
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}
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void EditingEngine::move_selected_lines_down()
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{
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if (!m_editor->is_editable())
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return;
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size_t first_line;
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size_t last_line;
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get_selection_line_boundaries(first_line, last_line);
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auto& lines = m_editor->document().lines();
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ASSERT(lines.size() != 0);
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if (last_line >= lines.size() - 1)
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return;
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lines.insert((int)first_line, lines.take((int)last_line + 1));
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m_editor->set_cursor({ first_line + 1, 0 });
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if (m_editor->has_selection()) {
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m_editor->selection()->set_start({ first_line + 1, 0 });
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m_editor->selection()->set_end({ last_line + 1, m_editor->line(last_line + 1).length() });
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}
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m_editor->did_change();
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m_editor->update();
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}
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void EditingEngine::delete_char()
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{
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if (!m_editor->is_editable())
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return;
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m_editor->do_delete();
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};
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void EditingEngine::delete_line()
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{
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if (!m_editor->is_editable())
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return;
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m_editor->delete_current_line();
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};
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}
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