48a1a5564f
It's not a very well written example, using (largely unneed) hacks to implement what it does. It's also misleading - the syntaxhighlighter example is a better showcase for building a useful code editor. Move it to manual tests. Fixes: QTBUG-111025 Pick-to: 6.5 Change-Id: I405d41688235bf3e9a08373e716769f26d02fec6 Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
// Copyright (C) 2016 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 <QPainter>
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#include <QTextBlock>
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//![constructor]
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CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
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{
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lineNumberArea = new LineNumberArea(this);
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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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updateLineNumberAreaWidth(0);
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highlightCurrentLine();
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}
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//![constructor]
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//![extraAreaWidth]
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int CodeEditor::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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//![extraAreaWidth]
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//![slotUpdateExtraAreaWidth]
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void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
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{
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setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
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}
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//![slotUpdateExtraAreaWidth]
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//![slotUpdateRequest]
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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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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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//![slotUpdateRequest]
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//![resizeEvent]
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void CodeEditor::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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//![resizeEvent]
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//![cursorPositionChanged]
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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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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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//![cursorPositionChanged]
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//![extraAreaPaintEvent_0]
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void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
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{
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QPainter painter(lineNumberArea);
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painter.fillRect(event->rect(), Qt::lightGray);
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//![extraAreaPaintEvent_0]
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//![extraAreaPaintEvent_1]
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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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//![extraAreaPaintEvent_1]
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//![extraAreaPaintEvent_2]
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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 + qRound(blockBoundingRect(block).height());
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++blockNumber;
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}
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}
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//![extraAreaPaintEvent_2]
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