Tips - How to sync several QSplitter

Romain C

Hello everyone,
Today I'm delivering a small tip, taht allows me to sync two horizontal QSplitter.
So let's begin by the problem, QSplitter can emit a signal when is moved : QSplitter::splitterMoved(int, int)
But we don't have a method that allow us to set the new position, QSplitter:moveSplitter(int,int) is protected.

So let's write a new class and call it like you want, in my case QsplitterExt

#ifndef QSPLITTEREXT_H
#define QSPLITTEREXT_H

#include <QSplitter>

class QSplitterExt : public QSplitter
{
    Q_OBJECT

public slots:
    void moveSplitter(int pos, int index)
    {
        if( index >= sizes().size() )
        {
            return;
        }
        bool oldState = blockSignals(true);
        QSplitter::moveSplitter(pos, index);
        blockSignals(oldState);
    }
};

#endif // QSPLITTEREXT_H

Now we got an external slot to receive a signal.

Let connect splitters:

QSplitterExt* h1Splitter = new QSplitterExt;
QSplitterExt* h2Splitter = new QSplitterExt;
connect(h1Splitter,SIGNAL(splitterMoved(int, int)),h2Splitter,SLOT(moveSplitter(int,int)));
connect(h2Splitter,SIGNAL(splitterMoved(int, int)),h1Splitter,SLOT(moveSplitter(int,int)));

It work like a charm!

Best regard!
Romain