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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:18:55 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:18:55 (GMT)
commite5fcad302d86d316390c6b0f62759a067313e8a9 (patch)
treec2afbf6f1066b6ce261f14341cf6d310e5595bc1 /examples/widgets/codeeditor/codeeditor.cpp
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Long live Qt 4.5!
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include <codeeditor.h>
+
+//![constructor]
+
+CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
+{
+ lineNumberArea = new LineNumberArea(this);
+
+ connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(updateLineNumberAreaWidth(int)));
+ connect(this, SIGNAL(updateRequest(const QRect &, int)), this, SLOT(updateLineNumberArea(const QRect &, int)));
+ connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(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().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]
+
+//![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 = (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);
+ 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]
+