Marc Wäckerlin
7 years ago
parent
32f090c2f0
commit
cb040f47a1
7 changed files with 172 additions and 24 deletions
@ -1 +1 @@ |
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/usr/share/automake-1.14/COPYING |
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/usr/share/automake-1.15/COPYING |
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@ -1 +1 @@ |
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/usr/share/automake-1.14/INSTALL |
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/usr/share/automake-1.15/INSTALL |
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#ifndef EDITOR_HXX |
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#define EDITOR_HXX |
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/// from qt http://doc.qt.io/qt-5/qtwidgets-widgets-codeeditor-example.html
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#include <QPlainTextEdit> |
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#include <QPainter> |
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#include <QTextBlock> |
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#include <QResizeEvent> |
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class CodeEditor; |
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class LineNumberArea: public QWidget { |
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public: |
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LineNumberArea(CodeEditor *editor); |
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QSize sizeHint() const override; |
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protected: |
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void paintEvent(QPaintEvent *event) override; |
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private: |
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CodeEditor *codeEditor; |
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}; |
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class CodeEditor: public QPlainTextEdit { |
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Q_OBJECT; |
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public: |
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CodeEditor(QWidget *parent = 0): QPlainTextEdit(parent) { |
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lineNumberArea = new LineNumberArea(this); |
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connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(updateLineNumberAreaWidth(int))); |
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connect(this, SIGNAL(updateRequest(QRect,int)), this, SLOT(updateLineNumberArea(QRect,int))); |
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connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(highlightCurrentLine())); |
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updateLineNumberAreaWidth(0); |
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highlightCurrentLine(); |
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} |
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void lineNumberAreaPaintEvent(QPaintEvent *event) { |
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QPainter painter(lineNumberArea); |
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painter.fillRect(event->rect(), Qt::lightGray); |
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QTextBlock block = firstVisibleBlock(); |
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int blockNumber = block.blockNumber(); |
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int top = (int) blockBoundingGeometry(block).translated(contentOffset()).top(); |
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int bottom = top + (int) 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(Qt::black); |
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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 + (int) blockBoundingRect(block).height(); |
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++blockNumber; |
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} |
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} |
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int lineNumberAreaWidth() { |
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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().width(QLatin1Char('9')) * digits; |
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return space; |
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} |
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protected: |
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void resizeEvent(QResizeEvent *e) override { |
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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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private Q_SLOTS: |
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void updateLineNumberAreaWidth(int newBlockCount) { |
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setViewportMargins(lineNumberAreaWidth(), 0, 0, 0); |
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} |
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void highlightCurrentLine() { |
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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 updateLineNumberArea(const QRect &rect, int dy) { |
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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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private: |
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QWidget *lineNumberArea; |
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}; |
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inline LineNumberArea::LineNumberArea(CodeEditor *editor): QWidget(editor) { |
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codeEditor = editor; |
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} |
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inline QSize LineNumberArea::sizeHint() const { |
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return QSize(codeEditor->lineNumberAreaWidth(), 0); |
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} |
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inline void LineNumberArea::paintEvent(QPaintEvent *event) { |
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codeEditor->lineNumberAreaPaintEvent(event); |
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} |
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#endif |
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