106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
// Copyright (C) 2024 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "codeeditor.h"
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#include "linenumberarea.h"
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#include <QPainter>
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#include <QTextBlock>
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CodeEditor::CodeEditor(QWidget *parent)
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: QPlainTextEdit{parent}
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, m_lineNumberArea{new LineNumberArea{this}}
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{
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setupConnections();
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updateLineNumberAreaWidth();
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highlightCurrentLine();
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}
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void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
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{
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const QRect eventRect = event->rect();
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QPainter painter{m_lineNumberArea};
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painter.fillRect(eventRect, palette().color(QPalette::AlternateBase));
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QTextBlock block = firstVisibleBlock();
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int blockNumber = block.blockNumber();
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qreal top = blockBoundingGeometry(block).translated(contentOffset()).top();
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qreal bottom = top + blockBoundingRect(block).height();
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while (block.isVisible() && (top <= eventRect.bottom()) && (blockNumber < blockCount())) {
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if (block.isVisible() && (bottom >= eventRect.top())) {
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const QString number = QString::number(blockNumber + 1);
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painter.setPen(palette().color(QPalette::Text));
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painter.drawText(0, qRound(top), m_lineNumberArea->width() - 5, fontMetrics().height(),
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Qt::AlignRight, number);
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}
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block = block.next();
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top = bottom;
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bottom = top + blockBoundingRect(block).height();
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++blockNumber;
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}
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}
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int CodeEditor::lineNumberAreaWidth() const
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{
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int digits = 1;
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int max = qMax(1, blockCount());
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while (max >= 10) {
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max /= 10;
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++digits;
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}
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const int space = 9 + fontMetrics().horizontalAdvance('9') * digits;
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return space;
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}
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void CodeEditor::setupConnections()
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{
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connect(this, &CodeEditor::blockCountChanged, this, &CodeEditor::updateLineNumberAreaWidth);
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connect(this, &CodeEditor::updateRequest, this, &CodeEditor::updateLineNumberArea);
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connect(this, &CodeEditor::cursorPositionChanged, this, &CodeEditor::highlightCurrentLine);
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}
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void CodeEditor::resizeEvent(QResizeEvent *event)
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{
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QPlainTextEdit::resizeEvent(event);
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const QRect rect = contentsRect();
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m_lineNumberArea->setGeometry(rect.left(), rect.top(), lineNumberAreaWidth(), rect.height());
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}
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void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
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{
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if (dy)
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m_lineNumberArea->scroll(0, dy);
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else
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m_lineNumberArea->update(0, rect.y(), m_lineNumberArea->width(), rect.height());
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if (rect.contains(viewport()->rect()))
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updateLineNumberAreaWidth();
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}
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void CodeEditor::updateLineNumberAreaWidth()
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{
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setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
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}
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void CodeEditor::highlightCurrentLine()
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{
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QList<QTextEdit::ExtraSelection> extraSelections;
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if (!isReadOnly()) {
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QTextEdit::ExtraSelection selection;
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selection.format.setBackground(palette().color(QPalette::AlternateBase));
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selection.format.setProperty(QTextFormat::FullWidthSelection, true);
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selection.cursor = textCursor();
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selection.cursor.clearSelection();
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extraSelections.append(selection);
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}
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setExtraSelections(extraSelections);
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}
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