mirror of
https://github.com/crystalidea/qt6windows7.git
synced 2024-12-02 00:32:24 +08:00
135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
// 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]
|
|
|