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#include "ConfigurationFreeEditor.h"
#include "HerculesStudio.h"
#include <QtGui>
ConfigurationFreeEditor::ConfigurationFreeEditor(QWidget *parent) :
QPlainTextEdit(parent)
{
mLineNumberArea = new LineNumberArea(this);
connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(updateLineNumberAreaWidth(int)));
connect(this, SIGNAL(updateRequest(QRect,int)), this, SLOT(updateLineNumberArea(QRect,int)));
connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(highlightCurrentLine()));
updateLineNumberAreaWidth(0);
highlightCurrentLine();
}
int ConfigurationFreeEditor::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 ConfigurationFreeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
{
setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
}
void ConfigurationFreeEditor::updateLineNumberArea(const QRect &rect, int dy)
{
if (dy)
mLineNumberArea->scroll(0, dy);
else
mLineNumberArea->update(0, rect.y(), mLineNumberArea->width(), rect.height());
if (rect.contains(viewport()->rect()))
updateLineNumberAreaWidth(0);
}
void ConfigurationFreeEditor::resizeEvent(QResizeEvent *e)
{
QPlainTextEdit::resizeEvent(e);
QRect cr = contentsRect();
mLineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height()));
}
void ConfigurationFreeEditor::highlightCurrentLine()
{
QList<QTextEdit::ExtraSelection> extraSelections;
if (!isReadOnly())
{
QTextEdit::ExtraSelection selection;
QColor lineColor = QColor(Qt::yellow).lighter(170);
selection.format.setBackground(lineColor);
selection.format.setProperty(QTextFormat::FullWidthSelection, true);
selection.cursor = textCursor();
selection.cursor.clearSelection();
extraSelections.append(selection);
}
setExtraSelections(extraSelections);
}
void ConfigurationFreeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
{
QPainter painter(mLineNumberArea);
painter.fillRect(event->rect(), Qt::gray);
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, mLineNumberArea->width(), fontMetrics().height(),
Qt::AlignRight, number);
}
block = block.next();
top = bottom;
bottom = top + (int) blockBoundingRect(block).height();
++blockNumber;
}
}
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