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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "codeeditor.h"
#include <QPainter>
#include <QTextBlock>
//![constructor]
CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
{
lineNumberArea = new LineNumberArea(this);
connect(this, &CodeEditor::blockCountChanged, this, &CodeEditor::updateLineNumberAreaWidth);
connect(this, &CodeEditor::updateRequest, this, &CodeEditor::updateLineNumberArea);
connect(this, &CodeEditor::cursorPositionChanged, this, &CodeEditor::highlightCurrentLine);
updateLineNumberAreaWidth(0);
highlightCurrentLine();
}
//![constructor]
//![extraAreaWidth]
int CodeEditor::lineNumberAreaWidth()
{
int digits = 1;
int max = qMax(1, blockCount());
while (max >= 10) {
max /= 10;
++digits;
}
int space = 3 + fontMetrics().horizontalAdvance(QLatin1Char('9')) * digits;
return space;
}
//![extraAreaWidth]
//![slotUpdateExtraAreaWidth]
void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
{
setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
}
//![slotUpdateExtraAreaWidth]
//![slotUpdateRequest]
void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
{
if (dy)
lineNumberArea->scroll(0, dy);
else
lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());
if (rect.contains(viewport()->rect()))
updateLineNumberAreaWidth(0);
}
//![slotUpdateRequest]
//![resizeEvent]
void CodeEditor::resizeEvent(QResizeEvent *e)
{
QPlainTextEdit::resizeEvent(e);
QRect cr = contentsRect();
lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height()));
}
//![resizeEvent]
//![cursorPositionChanged]
void CodeEditor::highlightCurrentLine()
{
QList<QTextEdit::ExtraSelection> extraSelections;
if (!isReadOnly()) {
QTextEdit::ExtraSelection selection;
QColor lineColor = QColor(Qt::yellow).lighter(160);
selection.format.setBackground(lineColor);
selection.format.setProperty(QTextFormat::FullWidthSelection, true);
selection.cursor = textCursor();
selection.cursor.clearSelection();
extraSelections.append(selection);
}
setExtraSelections(extraSelections);
}
//![cursorPositionChanged]
//![extraAreaPaintEvent_0]
void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
{
QPainter painter(lineNumberArea);
painter.fillRect(event->rect(), Qt::lightGray);
//![extraAreaPaintEvent_0]
//![extraAreaPaintEvent_1]
QTextBlock block = firstVisibleBlock();
int blockNumber = block.blockNumber();
int top = qRound(blockBoundingGeometry(block).translated(contentOffset()).top());
int bottom = top + qRound(blockBoundingRect(block).height());
//![extraAreaPaintEvent_1]
//![extraAreaPaintEvent_2]
while (block.isValid() && top <= event->rect().bottom()) {
if (block.isVisible() && bottom >= event->rect().top()) {
QString number = QString::number(blockNumber + 1);
painter.setPen(Qt::black);
painter.drawText(0, top, lineNumberArea->width(), fontMetrics().height(),
Qt::AlignRight, number);
}
block = block.next();
top = bottom;
bottom = top + qRound(blockBoundingRect(block).height());
++blockNumber;
}
}
//![extraAreaPaintEvent_2]
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