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529 lines
17 KiB
C++
529 lines
17 KiB
C++
#include <LibGUI/GTextEditor.h>
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#include <LibGUI/GScrollBar.h>
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#include <LibGUI/GFontDatabase.h>
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#include <SharedGraphics/Painter.h>
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#include <Kernel/KeyCode.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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GTextEditor::GTextEditor(GWidget* parent)
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: GWidget(parent)
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{
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set_font(GFontDatabase::the().get_by_name("Csilla Thin"));
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set_fill_with_background_color(false);
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m_vertical_scrollbar = new GScrollBar(Orientation::Vertical, this);
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m_vertical_scrollbar->set_step(4);
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m_vertical_scrollbar->on_change = [this] (int) {
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update();
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};
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m_horizontal_scrollbar = new GScrollBar(Orientation::Horizontal, this);
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m_horizontal_scrollbar->set_step(4);
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m_horizontal_scrollbar->set_big_step(30);
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m_horizontal_scrollbar->on_change = [this] (int) {
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update();
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};
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m_lines.append(make<Line>());
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}
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GTextEditor::~GTextEditor()
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{
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}
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void GTextEditor::set_text(const String& text)
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{
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m_lines.clear();
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int start_of_current_line = 0;
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auto add_line = [&] (int current_position) {
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int line_length = current_position - start_of_current_line;
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auto line = make<Line>();
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if (line_length)
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line->set_text(text.substring(start_of_current_line, current_position - start_of_current_line));
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m_lines.append(move(line));
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start_of_current_line = current_position + 1;
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};
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int i = 0;
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for (i = 0; i < text.length(); ++i) {
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if (text[i] == '\n')
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add_line(i);
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}
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add_line(i);
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set_cursor(0, 0);
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update();
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}
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void GTextEditor::resize_event(GResizeEvent& event)
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{
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update_scrollbar_ranges();
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m_vertical_scrollbar->set_relative_rect(event.size().width() - m_vertical_scrollbar->preferred_size().width(), 0, m_vertical_scrollbar->preferred_size().width(), event.size().height() - m_horizontal_scrollbar->preferred_size().height());
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m_horizontal_scrollbar->set_relative_rect(0, event.size().height() - m_horizontal_scrollbar->preferred_size().height(), event.size().width() - m_vertical_scrollbar->preferred_size().width(), m_horizontal_scrollbar->preferred_size().height());
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}
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void GTextEditor::update_scrollbar_ranges()
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{
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int available_height = height() - m_horizontal_scrollbar->height();
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int excess_height = max(0, (content_height() + padding() * 2) - available_height);
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m_vertical_scrollbar->set_range(0, excess_height);
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int available_width = width() - m_vertical_scrollbar->width() - ruler_width();
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int excess_width = max(0, (content_width() + padding() * 2) - available_width);
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m_horizontal_scrollbar->set_range(0, excess_width);
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m_vertical_scrollbar->set_big_step(visible_content_rect().height());
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}
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int GTextEditor::content_height() const
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{
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return line_count() * line_height();
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}
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int GTextEditor::content_width() const
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{
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// FIXME: Cache this somewhere.
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int max_width = 0;
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for (auto& line : m_lines)
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max_width = max(line->width(font()), max_width);
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return max_width;
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}
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GTextPosition GTextEditor::text_position_at(const Point& a_position) const
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{
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auto position = a_position;
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position.move_by(m_horizontal_scrollbar->value(), m_vertical_scrollbar->value());
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position.move_by(-(padding() + ruler_width()), -padding());
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int line_index = position.y() / line_height();
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int column_index = position.x() / glyph_width();
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line_index = min(line_index, line_count() - 1);
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column_index = min(column_index, m_lines[line_index]->length());
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return { line_index, column_index };
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}
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void GTextEditor::mousedown_event(GMouseEvent& event)
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{
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set_cursor(text_position_at(event.position()));
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}
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int GTextEditor::ruler_width() const
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{
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// FIXME: Resize based on needed space.
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return 5 * font().glyph_width('x') + 4;
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}
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Rect GTextEditor::ruler_content_rect(int line_index) const
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{
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return {
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0 - ruler_width() - padding() + m_horizontal_scrollbar->value(),
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line_index * line_height(),
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ruler_width(),
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line_height()
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};
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}
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void GTextEditor::paint_event(GPaintEvent& event)
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{
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Painter painter(*this);
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painter.set_clip_rect(event.rect());
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painter.fill_rect(event.rect(), Color::White);
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Rect ruler_rect { 0, 0, ruler_width(), height() - m_horizontal_scrollbar->height()};
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painter.fill_rect(ruler_rect, Color::LightGray);
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painter.draw_line(ruler_rect.top_right(), ruler_rect.bottom_right(), Color::DarkGray);
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painter.translate(-m_horizontal_scrollbar->value(), -m_vertical_scrollbar->value());
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painter.translate(padding() + ruler_width(), padding());
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int exposed_width = max(content_width(), width());
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int first_visible_line = text_position_at(event.rect().top_left()).line();
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int last_visible_line = text_position_at(event.rect().bottom_right()).line();
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painter.set_font(Font::default_font());
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for (int i = first_visible_line; i <= last_visible_line; ++i) {
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bool is_current_line = i == m_cursor.line();
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auto ruler_line_rect = ruler_content_rect(i);
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//painter.fill_rect(ruler_line_rect, Color::LightGray);
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Color text_color = Color::MidGray;
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if (is_current_line) {
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painter.set_font(Font::default_bold_font());
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text_color = Color::DarkGray;
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}
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painter.draw_text(ruler_line_rect.shrunken(2, 0), String::format("%u", i), TextAlignment::CenterRight, text_color);
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if (is_current_line)
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painter.set_font(Font::default_font());
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}
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painter.set_font(font());
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painter.set_clip_rect({ ruler_rect.right() + 1, 0, width() - m_vertical_scrollbar->width() - ruler_width(), height() - m_horizontal_scrollbar->height() });
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for (int i = first_visible_line; i <= last_visible_line; ++i) {
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auto& line = *m_lines[i];
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auto line_rect = line_content_rect(i);
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line_rect.set_width(exposed_width);
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if (i == m_cursor.line())
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painter.fill_rect(line_rect, Color(230, 230, 230));
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painter.draw_text(line_rect, line.characters(), line.length(), TextAlignment::CenterLeft, Color::Black);
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}
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if (is_focused() && m_cursor_state)
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painter.fill_rect(cursor_content_rect(), Color::Red);
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painter.clear_clip_rect();
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painter.set_clip_rect(event.rect());
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painter.translate(0 - padding() - ruler_width(), -padding());
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painter.translate(m_horizontal_scrollbar->value(), m_vertical_scrollbar->value());
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painter.fill_rect({ m_horizontal_scrollbar->relative_rect().top_right().translated(1, 0), { m_vertical_scrollbar->preferred_size().width(), m_horizontal_scrollbar->preferred_size().height() } }, Color::LightGray);
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if (is_focused()) {
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Rect item_area_rect { 0, 0, width() - m_vertical_scrollbar->width(), height() - m_horizontal_scrollbar->height() };
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painter.draw_rect(item_area_rect, Color::from_rgb(0x84351a));
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};
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}
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void GTextEditor::keydown_event(GKeyEvent& event)
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{
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if (!event.modifiers() && event.key() == KeyCode::Key_Up) {
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if (m_cursor.line() > 0) {
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int new_line = m_cursor.line() - 1;
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int new_column = min(m_cursor.column(), m_lines[new_line]->length());
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set_cursor(new_line, new_column);
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}
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return;
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}
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if (!event.modifiers() && event.key() == KeyCode::Key_Down) {
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if (m_cursor.line() < (m_lines.size() - 1)) {
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int new_line = m_cursor.line() + 1;
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int new_column = min(m_cursor.column(), m_lines[new_line]->length());
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set_cursor(new_line, new_column);
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}
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return;
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}
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if (!event.modifiers() && event.key() == KeyCode::Key_PageUp) {
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if (m_cursor.line() > 0) {
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int new_line = max(0, m_cursor.line() - visible_content_rect().height() / line_height());
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int new_column = min(m_cursor.column(), m_lines[new_line]->length());
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set_cursor(new_line, new_column);
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}
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return;
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}
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if (!event.modifiers() && event.key() == KeyCode::Key_PageDown) {
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if (m_cursor.line() < (m_lines.size() - 1)) {
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int new_line = min(line_count() - 1, m_cursor.line() + visible_content_rect().height() / line_height());
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int new_column = min(m_cursor.column(), m_lines[new_line]->length());
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set_cursor(new_line, new_column);
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}
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return;
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}
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if (!event.modifiers() && event.key() == KeyCode::Key_Left) {
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if (m_cursor.column() > 0) {
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int new_column = m_cursor.column() - 1;
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set_cursor(m_cursor.line(), new_column);
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}
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return;
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}
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if (!event.modifiers() && event.key() == KeyCode::Key_Right) {
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if (m_cursor.column() < current_line().length()) {
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int new_column = m_cursor.column() + 1;
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set_cursor(m_cursor.line(), new_column);
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}
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return;
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}
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if (!event.modifiers() && event.key() == KeyCode::Key_Home) {
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set_cursor(m_cursor.line(), 0);
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return;
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}
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if (!event.modifiers() && event.key() == KeyCode::Key_End) {
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set_cursor(m_cursor.line(), current_line().length());
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return;
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}
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if (event.ctrl() && event.key() == KeyCode::Key_Home) {
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set_cursor(0, 0);
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return;
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}
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if (event.ctrl() && event.key() == KeyCode::Key_End) {
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set_cursor(line_count() - 1, m_lines[line_count() - 1]->length());
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return;
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}
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if (!event.modifiers() && event.key() == KeyCode::Key_Backspace) {
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if (m_cursor.column() > 0) {
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// Backspace within line
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current_line().remove(m_cursor.column() - 1);
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update_scrollbar_ranges();
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set_cursor(m_cursor.line(), m_cursor.column() - 1);
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return;
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}
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if (m_cursor.column() == 0 && m_cursor.line() != 0) {
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// Backspace at column 0; merge with previous line
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auto& previous_line = *m_lines[m_cursor.line() - 1];
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int previous_length = previous_line.length();
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previous_line.append(current_line().characters(), current_line().length());
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m_lines.remove(m_cursor.line());
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update_scrollbar_ranges();
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update();
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set_cursor(m_cursor.line() - 1, previous_length);
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return;
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}
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return;
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}
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if (!event.modifiers() && event.key() == KeyCode::Key_Delete) {
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if (m_cursor.column() < current_line().length()) {
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// Delete within line
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current_line().remove(m_cursor.column());
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update_scrollbar_ranges();
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update_cursor();
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return;
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}
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if (m_cursor.column() == (current_line().length() + 1) && m_cursor.line() != line_count() - 1) {
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// Delete at end of line; merge with next line
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auto& next_line = *m_lines[m_cursor.line() + 1];
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int previous_length = current_line().length();
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current_line().append(next_line.characters(), next_line.length());
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m_lines.remove(m_cursor.line() + 1);
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update_scrollbar_ranges();
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update();
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set_cursor(m_cursor.line(), previous_length);
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return;
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}
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return;
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}
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if (!event.text().is_empty())
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insert_at_cursor(event.text()[0]);
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return GWidget::keydown_event(event);
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}
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void GTextEditor::insert_at_cursor(char ch)
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{
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bool at_head = m_cursor.column() == 0;
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bool at_tail = m_cursor.column() == current_line().length();
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if (ch == '\n') {
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if (at_tail || at_head) {
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m_lines.insert(m_cursor.line() + (at_tail ? 1 : 0), make<Line>());
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update_scrollbar_ranges();
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update();
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set_cursor(m_cursor.line() + 1, 0);
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return;
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}
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auto new_line = make<Line>();
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new_line->append(current_line().characters() + m_cursor.column(), current_line().length() - m_cursor.column());
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current_line().truncate(m_cursor.column());
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m_lines.insert(m_cursor.line() + 1, move(new_line));
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update_scrollbar_ranges();
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update();
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set_cursor(m_cursor.line() + 1, 0);
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return;
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}
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current_line().insert(m_cursor.column(), ch);
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update_scrollbar_ranges();
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set_cursor(m_cursor.line(), m_cursor.column() + 1);
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update_cursor();
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}
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Rect GTextEditor::visible_content_rect() const
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{
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return {
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m_horizontal_scrollbar->value(),
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m_vertical_scrollbar->value(),
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width() - m_vertical_scrollbar->width() - padding() * 2 - ruler_width(),
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height() - m_horizontal_scrollbar->height() - padding() * 2
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};
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}
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Rect GTextEditor::cursor_content_rect() const
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{
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if (!m_cursor.is_valid())
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return { };
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ASSERT(!m_lines.is_empty());
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ASSERT(m_cursor.column() <= (current_line().length() + 1));
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return { m_cursor.column() * glyph_width(), m_cursor.line() * line_height(), 1, line_height() };
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}
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Rect GTextEditor::line_widget_rect(int line_index) const
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{
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ASSERT(m_horizontal_scrollbar);
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ASSERT(m_vertical_scrollbar);
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auto rect = line_content_rect(line_index);
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rect.move_by(-(m_horizontal_scrollbar->value() - padding()), -(m_vertical_scrollbar->value() - padding()));
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rect.set_width(rect.width() + 1); // Add 1 pixel for when the cursor is on the end.
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rect.intersect(this->rect());
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// This feels rather hackish, but extend the rect to the edge of the content view:
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rect.set_right(m_vertical_scrollbar->relative_rect().left() - 1);
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return rect;
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}
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void GTextEditor::scroll_cursor_into_view()
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{
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auto visible_content_rect = this->visible_content_rect();
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auto rect = cursor_content_rect();
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if (visible_content_rect.is_empty())
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return;
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if (visible_content_rect.contains(rect))
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return;
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if (rect.top() < visible_content_rect.top())
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m_vertical_scrollbar->set_value(rect.top());
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else if (rect.bottom() > visible_content_rect.bottom())
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m_vertical_scrollbar->set_value(rect.bottom() - visible_content_rect.height());
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if (rect.left() < visible_content_rect.left())
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m_horizontal_scrollbar->set_value(rect.left());
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else if (rect.right() > visible_content_rect.right())
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m_horizontal_scrollbar->set_value(rect.right() - visible_content_rect.width());
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update();
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}
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Rect GTextEditor::line_content_rect(int line_index) const
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{
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return {
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0,
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line_index * line_height(),
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content_width(),
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line_height()
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};
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}
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void GTextEditor::update_cursor()
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{
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update(line_widget_rect(m_cursor.line()));
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}
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void GTextEditor::set_cursor(int line, int column)
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{
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set_cursor({ line, column });
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}
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void GTextEditor::set_cursor(const GTextPosition& position)
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{
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if (m_cursor == position)
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return;
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auto old_cursor_line_rect = line_widget_rect(m_cursor.line());
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m_cursor = position;
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m_cursor_state = true;
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scroll_cursor_into_view();
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update(old_cursor_line_rect);
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update_cursor();
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if (on_cursor_change)
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on_cursor_change(*this);
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}
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void GTextEditor::focusin_event(GEvent&)
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{
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update_cursor();
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start_timer(500);
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}
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void GTextEditor::focusout_event(GEvent&)
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{
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stop_timer();
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}
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void GTextEditor::timer_event(GTimerEvent&)
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{
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m_cursor_state = !m_cursor_state;
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if (is_focused())
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update_cursor();
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}
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GTextEditor::Line::Line()
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{
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m_text.append(0);
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}
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void GTextEditor::Line::set_text(const String& text)
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{
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if (text.length() == length() && !memcmp(text.characters(), characters(), length()))
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return;
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m_text.resize(text.length() + 1);
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memcpy(m_text.data(), text.characters(), text.length() + 1);
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}
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int GTextEditor::Line::width(const Font& font) const
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{
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return font.glyph_width('x') * length();
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}
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void GTextEditor::Line::append(const char* characters, int length)
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{
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int old_length = m_text.size() - 1;
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m_text.resize(m_text.size() + length);
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memcpy(m_text.data() + old_length, characters, length);
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m_text.last() = 0;
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}
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void GTextEditor::Line::append(char ch)
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{
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insert(length(), ch);
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}
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void GTextEditor::Line::prepend(char ch)
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{
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insert(0, ch);
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}
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void GTextEditor::Line::insert(int index, char ch)
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{
|
|
if (index == length()) {
|
|
m_text.last() = ch;
|
|
m_text.append(0);
|
|
} else {
|
|
m_text.insert(index, move(ch));
|
|
}
|
|
}
|
|
|
|
void GTextEditor::Line::remove(int index)
|
|
{
|
|
if (index == length()) {
|
|
m_text.take_last();
|
|
m_text.last() = 0;
|
|
} else {
|
|
m_text.remove(index);
|
|
}
|
|
}
|
|
|
|
void GTextEditor::Line::truncate(int length)
|
|
{
|
|
m_text.resize(length + 1);
|
|
m_text.last() = 0;
|
|
}
|
|
|
|
bool GTextEditor::write_to_file(const String& path)
|
|
{
|
|
int fd = open(path.characters(), O_WRONLY | O_CREAT, 0666);
|
|
if (fd < 0) {
|
|
perror("open");
|
|
return false;
|
|
}
|
|
for (int i = 0; i < m_lines.size(); ++i) {
|
|
auto& line = *m_lines[i];
|
|
if (line.length()) {
|
|
ssize_t nwritten = write(fd, line.characters(), line.length());
|
|
if (nwritten < 0) {
|
|
perror("write");
|
|
close(fd);
|
|
return false;
|
|
}
|
|
}
|
|
if (i != m_lines.size() - 1) {
|
|
char ch = '\n';
|
|
ssize_t nwritten = write(fd, &ch, 1);
|
|
if (nwritten != 1) {
|
|
perror("write");
|
|
close(fd);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
close(fd);
|
|
return true;
|
|
}
|