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// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//
#include <BALL/VIEW/WIDGETS/textEditorWidget.h>
#include <QtCore/QSize>
#include <QtGui/QPainter>
#include <QtGui/QTextBlock>
namespace BALL
{
namespace VIEW
{
TextEditorWidget::TextEditorWidget(QWidget *parent)
: QPlainTextEdit(parent)
{
line_numbers_ = new LineNumbers(this);
connect(this, SIGNAL(blockCountChanged(int)),
this, SLOT(updateLineNumbersWidth(int)));
connect(this, SIGNAL(updateRequest(QRect,int)),
this, SLOT(updateLineNumbers(QRect,int)));
connect(this, SIGNAL(cursorPositionChanged()),
this, SLOT(highlightCurrentLine()));
updateLineNumbersWidth(0);
highlightCurrentLine();
}
int TextEditorWidget::lineNumbersWidth()
{
int max = std::max(1, blockCount());
int digits = ((int)log10((float)max))+1;
int space = 3 + fontMetrics().width(QLatin1Char('9')) * digits;
return space;
}
void TextEditorWidget::updateLineNumbersWidth(int /* newBlockCount */)
{
setViewportMargins(lineNumbersWidth(), 0, 0, 0);
}
void TextEditorWidget::updateLineNumbers(const QRect &rect, int dy)
{
if (dy)
line_numbers_->scroll(0, dy);
else
line_numbers_->update(0, rect.y(), line_numbers_->width(), rect.height());
if (rect.contains(viewport()->rect()))
updateLineNumbersWidth(0);
}
void TextEditorWidget::resizeEvent(QResizeEvent *e)
{
QPlainTextEdit::resizeEvent(e);
QRect cr = contentsRect();
line_numbers_->setGeometry(QRect(cr.left(), cr.top(),
lineNumbersWidth(), cr.height()));
}
void TextEditorWidget::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);
}
void TextEditorWidget::lineNumbersPaintEvent(QPaintEvent *event)
{
QPainter painter(line_numbers_);
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+3, line_numbers_->width(), fontMetrics().height(),
Qt::AlignRight, number);
}
block = block.next();
top = bottom;
bottom = top + (int) blockBoundingRect(block).height();
++blockNumber;
}
}
TextEditorWidget::LineNumbers::LineNumbers(TextEditorWidget *editor)
: QWidget(editor)
{
editor_ = editor;
}
QSize TextEditorWidget::LineNumbers::sizeHint() const
{
return QSize(editor_->lineNumbersWidth(), 0);
}
void TextEditorWidget::LineNumbers::paintEvent(QPaintEvent *event)
{
editor_->lineNumbersPaintEvent(event);
}
}
}
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