98 lines
3.0 KiB
C++
98 lines
3.0 KiB
C++
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#include "linenumbertexteditor.h"
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#include <QPainter>
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#include <QTextBlock>
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LineNumberTextEditor::LineNumberTextEditor(QWidget *parent)
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{
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lineNumberArea = new LineNumberArea(this);
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connect(this, &LineNumberTextEditor::blockCountChanged, this, &LineNumberTextEditor::updateLineNumberAreaWidth);
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connect(this, &LineNumberTextEditor::updateRequest, this, &LineNumberTextEditor::updateLineNumberArea);
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//connect(this, &LineNumberTextEditor::cursorPositionChanged, this, &LineNumberTextEditor::highlightCurrentLine);
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updateLineNumberAreaWidth(0);
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//highlightCurrentLine();
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}
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int LineNumberTextEditor::lineNumberAreaWidth()
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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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int space = 3 + fontMetrics().horizontalAdvance(QLatin1Char('9')) * digits;
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return space;
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}
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void LineNumberTextEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
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{
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setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
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}
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void LineNumberTextEditor::updateLineNumberArea(const QRect &rect, int dy)
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{
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if (dy)
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lineNumberArea->scroll(0, dy);
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else
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lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());
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if (rect.contains(viewport()->rect()))
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updateLineNumberAreaWidth(0);
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}
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void LineNumberTextEditor::resizeEvent(QResizeEvent *e)
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{
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QPlainTextEdit::resizeEvent(e);
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QRect cr = contentsRect();
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lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height()));
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}
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void LineNumberTextEditor::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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QColor lineColor = QColor(Qt::yellow).lighter(160);
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selection.format.setBackground(lineColor);
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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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void LineNumberTextEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
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{
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QPainter painter(lineNumberArea);
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painter.setFont(font());
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painter.fillRect(event->rect(), palette().color(QPalette::Button));
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QTextBlock block = firstVisibleBlock();
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int blockNumber = block.blockNumber();
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int top = qRound(blockBoundingGeometry(block).translated(contentOffset()).top());
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int bottom = top + qRound(blockBoundingRect(block).height());
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while (block.isValid() && top <= event->rect().bottom()) {
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if (block.isVisible() && bottom >= event->rect().top()) {
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QString number = QString::number(blockNumber + 1);
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painter.setPen(palette().color(QPalette::ButtonText));
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painter.drawText(0, top, lineNumberArea->width(), 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 + qRound(blockBoundingRect(block).height());
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++blockNumber;
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}
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}
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