C++/Qt/QSplitter

Paint QSplitter

<source lang="cpp"> /****************************************************************************

• • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
  • All rights reserved.
  • Contact: Nokia Corporation (qt-info@nokia.com)
  • This file is part of the documentation of the Qt Toolkit.
  • $QT_BEGIN_LICENSE:LGPL$
  • Commercial Usage
  • Licensees holding valid Qt Commercial licenses may use this file in
  • accordance with the Qt Commercial License Agreement provided with the
  • Software or, alternatively, in accordance with the terms contained in
  • a written agreement between you and Nokia.
  • 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.
  • 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 have questions regarding the use of this file, please contact
  • Nokia at qt-info@nokia.com.
  • $QT_END_LICENSE$
  • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • /

1. ifndef SPLITTER_H
2. define SPLITTER_H
3. include <QLinearGradient>
4. include <QSplitter>
5. include <QSplitterHandle>

class QPaintEvent;

class Splitter : public QSplitter { public:

   Splitter(Qt::Orientation orientation, QWidget *parent = 0);

protected:

   QSplitterHandle *createHandle();

};

class SplitterHandle : public QSplitterHandle { public:

   SplitterHandle(Qt::Orientation orientation, QSplitter *parent);

protected:

   void paintEvent(QPaintEvent *event);

private:

   QLinearGradient gradient;

};

1. endif

1. include <QtGui>
2. include "splitter.h"

SplitterHandle::SplitterHandle(Qt::Orientation orientation, QSplitter *parent)

   : QSplitterHandle(orientation, parent)

{

   gradient.setColorAt(0.0, Qt::darkGreen);
   gradient.setColorAt(0.25, Qt::white);
   gradient.setColorAt(1.0, Qt::darkGreen);

}

void SplitterHandle::paintEvent(QPaintEvent *event) {

   QPainter painter(this);
   if (orientation() == Qt::Horizontal) {
       gradient.setStart(rect().left(), rect().height()/2);
       gradient.setFinalStop(rect().right(), rect().height()/2);
   } else {
       gradient.setStart(rect().width()/2, rect().top());
       gradient.setFinalStop(rect().width()/2, rect().bottom());
   }
   painter.fillRect(event->rect(), QBrush(gradient));

}

Splitter::Splitter(Qt::Orientation orientation, QWidget *parent)

   : QSplitter(orientation, parent)

{ }

QSplitterHandle *Splitter::createHandle() {

   return new SplitterHandle(orientation(), this);

}

1. include <QApplication>
2. include <QLabel>
3. include "splitter.h"

int main(int argc, char *argv[]) {

   QApplication app(argc, argv);
   Splitter splitter(Qt::Horizontal);
   splitter.addWidget(new QLabel("Hello"));
   splitter.addWidget(new QLabel("World"));
   Splitter verticalSplitter(Qt::Vertical, &splitter);
   verticalSplitter.addWidget(new QLabel("A"));
   verticalSplitter.addWidget(new QLabel("B"));
   splitter.show();
   return app.exec();

}

 </source>

QSplitter, QListView and QTreeView

<source lang="cpp"> /****************************************************************************

• • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
  • All rights reserved.
  • Contact: Nokia Corporation (qt-info@nokia.com)
  • This file is part of the documentation of the Qt Toolkit.
  • $QT_BEGIN_LICENSE:LGPL$
  • Commercial Usage
  • Licensees holding valid Qt Commercial licenses may use this file in
  • accordance with the Qt Commercial License Agreement provided with the
  • Software or, alternatively, in accordance with the terms contained in
  • a written agreement between you and Nokia.
  • 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.
  • 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 have questions regarding the use of this file, please contact
  • Nokia at qt-info@nokia.com.
  • $QT_END_LICENSE$
  • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • /

1. include <QtGui>

void processSize(int) { } int main() {

   QWidget *parent = 0;

   QSplitter *splitter = new QSplitter(parent);
   QListView *listview = new QListView;
   QTreeView *treeview = new QTreeView;
   QTextEdit *textedit = new QTextEdit;
   splitter->addWidget(listview);
   splitter->addWidget(treeview);
   splitter->addWidget(textedit);

   {
   // SAVE STATE
   QSettings settings;
   settings.setValue("splitterSizes", splitter->saveState());
   }
   {
   // RESTORE STATE
   QSettings settings;
   splitter->restoreState(settings.value("splitterSizes").toByteArray());
   }

   QListIterator<int> it(splitter->sizes());
   while (it.hasNext())
       processSize(it.next());

   return 0;

}

 </source>

Set Stretch Factor for QSplitter

<source lang="cpp">

1. include <QtGui>

int main(int argc, char *argv[]){

 QApplication a(argc, argv);
 QSplitter s;
 QTextEdit *txtEdit = 0;
 for (int stretch = 1; stretch <= 5; stretch++) {
   txtEdit = new QTextEdit(&s);
   s.addWidget(txtEdit);
   s.setStretchFactor(s.indexOf(txtEdit), stretch);
 }
 s.show();
 return a.exec();

}

 </source>