#include "codebrowser.h"
#include
#include
CodeBrowser::CodeBrowser(QWidget *parent) :
QPlainTextEdit(parent)
{
lineNumberArea = new LineNumberArea(this);
setReadOnly(true);
connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(updateLineNumberAreaWidth(int)));
connect(this, SIGNAL(updateRequest(QRect,int)), this, SLOT(updateLineNumberArea(QRect,int)));
updateLineNumberAreaWidth(0);
}
void CodeBrowser::setLine(int line)
{
const QString text = toPlainText();
int pos = 1;
for (pos = 0; line > 1 && pos < text.size(); ++pos) {
if (text[pos] == '\n' || text[pos] == '\r') {
--line;
if (text.size() > pos + 1 && text[pos] == '\r' && text[pos+1] == '\n')
++pos;
}
}
QTextCursor cursor = textCursor();
cursor.setPosition(pos);
setTextCursor(cursor);
QTextEdit::ExtraSelection selection;
selection.format.setBackground(QColor(Qt::red));
selection.format.setProperty(QTextFormat::FullWidthSelection, true);
selection.cursor = cursor;
selection.cursor.clearSelection();
QList extraSelections;
extraSelections.append(selection);
setExtraSelections(extraSelections);
}
void CodeBrowser::lineNumberAreaPaintEvent(QPaintEvent *event)
{
QPainter painter(lineNumberArea);
painter.fillRect(event->rect(), Qt::lightGray);
QTextBlock block = firstVisibleBlock();
int blockNumber = block.blockNumber();
int top = (int) blockBoundingGeometry(block).translated(contentOffset()).top();
int bottom = top + (int) blockBoundingRect(block).height();
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 + (int) blockBoundingRect(block).height();
++blockNumber;
}
}
int CodeBrowser::lineNumberAreaWidth()
{
int digits = 1;
int max = qMax(1, blockCount());
while (max >= 10) {
max /= 10;
++digits;
}
int space = 3 + fontMetrics().width(QLatin1Char('9')) * digits;
return space;
}
void CodeBrowser::resizeEvent(QResizeEvent *e)
{
QPlainTextEdit::resizeEvent(e);
QRect cr = contentsRect();
lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height()));
}
void CodeBrowser::updateLineNumberAreaWidth(int /* newBlockCount */)
{
setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
}
void CodeBrowser::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);
}