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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* This file has been copied from Nokia's Qt Examples, with minor modifications
* made available under the LGPL version 2.1, as the original file was licensed
*
****************************************************************************
****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#include <QtGui>
#include <QApplication>
#include "codeeditor.h"
//![constructor]
CodeEditor::CodeEditor(QWidget *parent)
: QPlainTextEdit(parent), completer(this)
{
lineNumberArea = new LineNumberArea(this);
connect(this, SIGNAL(blockCountChanged(int)),
this, SLOT(updateLineNumberAreaWidth(int)));
connect(this, SIGNAL(updateRequest(QRect,int)),
this, SLOT(updateLineNumberArea(QRect,int)));
updateLineNumberAreaWidth(0);
QObject::connect(this, SIGNAL(cursorPositionChanged()),
this, SLOT(cursorMoved()));
completer.hide();
settings.beginGroup("CodeEditor");
}
//![constructor]
//![extraAreaWidth]
int CodeEditor::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;
}
//![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]
void CodeEditor::cursorMoved()
{
/* Closing the completer if the cursor has moved out of its bounds */
if(completer.isVisible())
{
if(textCursor().position() < tagBegin
|| textCursor().position() > tagEnd)
{
completer.hide();
}
}
}
//![resizeEvent]
void CodeEditor::resizeEvent(QResizeEvent *e)
{
QPlainTextEdit::resizeEvent(e);
QRect cr = contentsRect();
lineNumberArea->setGeometry(QRect(cr.left(), cr.top(),
lineNumberAreaWidth(), cr.height()));
}
//![resizeEvent]
void CodeEditor::keyPressEvent(QKeyEvent *event)
{
if(!settings.value("completeSyntax", false).toBool())
{
QPlainTextEdit::keyPressEvent(event);
return;
}
if(completer.isVisible())
{
/* Handling the completer */
if(event->key() == Qt::Key_Up)
{
/* Up/down arrow presses get sent right along to the completer
* to navigate through the list
*/
if(completer.currentIndex().row() > 0)
QApplication::sendEvent(&completer, event);
}
else if(event->key() == Qt::Key_Down)
{
if(completer.currentIndex().row()
< completer.topLevelItemCount() - 1)
QApplication::sendEvent(&completer, event);
}
else if(event->key() == Qt::Key_Backspace)
{
tagEnd--;
QPlainTextEdit::keyPressEvent(event);
}
else if(event->key() == Qt::Key_Escape)
{
/* Escape hides the completer */
completer.hide();
QPlainTextEdit::keyPressEvent(event);
}
else if(event->key() == Qt::Key_Enter)
{
/* The enter key inserts the currently selected tag */
}
else if(event->key() == Qt::Key_Question)
{
/* The question mark doesn't filter the list */
tagEnd++;
QPlainTextEdit::keyPressEvent(event);
}
else if(event->key() == Qt::Key_Left
|| event->key() == Qt::Key_Right)
{
/* Left and right keys shouldn't affect tagEnd */
QPlainTextEdit::keyPressEvent(event);
}
else
{
/* Otherwise, we have to filter the list */
tagEnd++;
QPlainTextEdit::keyPressEvent(event);
QString filterText = "";
}
}
else
{
/* Deciding whether to show the completer */
QPlainTextEdit::keyPressEvent(event);
if(event->key() == Qt::Key_Percent)
{
tagBegin = textCursor().position();
tagEnd = textCursor().position();
completer.filter("");
completer.move(cursorRect().left(), cursorRect().bottom());
if(completer.frameGeometry().right() > width())
completer.move(width() - completer.width(), completer.y());
if(completer.frameGeometry().bottom() > height())
completer.move(completer.x(),
cursorRect().top() - completer.height());
completer.show();
}
}
}
//![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 = (int) blockBoundingGeometry(block).translated(contentOffset()).top();
int bottom = top + (int) 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);
/* Drawing an error circle if necessary */
if(errors.contains(blockNumber + 1))
{
painter.fillRect(QRect(0, top, lineNumberArea->width(),
fontMetrics().height()), errorColor);
}
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;
}
}
//![extraAreaPaintEvent_2]
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