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# Splitter

This example shows how to use splitters. With their help users can decide herself/himself, how much space each of the multiple child items should get.

Implementation:

    /****************************************************************************
    ** $Id:  qt/splitter.cpp   3.0.3   edited Oct 12 12:18 $
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of an example program for Qt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #include <qapplication.h>
    #include <qlabel.h>
    #include <qsplitter.h>
    #include <qmultilineedit.h>

    #include <qpainter.h>

    class Test : public QWidget {
    public:
        Test(QWidget* parent=0, const char* name=0, int f=0);
        void paintEvent(QPaintEvent* e);
    private:
    };

    Test::Test(QWidget* parent, const char* name, int f) :
        QWidget(parent, name, f)
    {

    }

    void Test::paintEvent(QPaintEvent* e)
    {
        QPainter p(this);
        p.setClipRect(e->rect());
        const int d = 1000; //large number
        int x1 = 0;
        int x2 = width()-1;
        int y1 = 0;
        int y2 = height()-1;

        int x = (x1+x2)/2;
        p.drawLine( x, y1, x+d, y1+d   );
        p.drawLine( x, y1, x-d, y1+d   );
        p.drawLine( x, y2, x+d, y2-d   );
        p.drawLine( x, y2, x-d, y2-d   );

        int y = (y1+y2)/2;
        p.drawLine( x1, y, x1+d, y+d   );
        p.drawLine( x1, y, x1+d, y-d   );
        p.drawLine( x2, y, x2-d, y+d   );
        p.drawLine( x2, y, x2-d, y-d   );
    }

    int main( int argc, char ** argv )
    {
        QApplication a( argc, argv );

        QSplitter *s1 = new QSplitter( QSplitter::Vertical, 0 , "main" );

        QSplitter *s2 = new QSplitter( QSplitter::Horizontal, s1, "top" );

        Test *t1 = new Test( s2, "topLeft" );
        t1->setBackgroundColor( Qt::blue.light( 180 ) );
        t1->setMinimumSize( 50, 0 );

        Test *t2 = new Test( s2, "topRight" );
        t2->setBackgroundColor( Qt::green.light( 180 ) );
        s2->setResizeMode( t2, QSplitter::KeepSize );
        s2->moveToFirst( t2 );

        QSplitter *s3 = new QSplitter( QSplitter::Horizontal,  s1, "bottom" );

        Test *t3 = new Test( s3, "bottomLeft" );
        t3->setBackgroundColor( Qt::red );
        Test *t4 = new Test( s3, "bottomMiddle" );
        t4->setBackgroundColor( Qt::white );

        Test *t5 = new Test( s3, "bottomRight" );
        t5->setMaximumHeight( 250 );
        t5->setMinimumSize( 80, 50 );
        t5->setBackgroundColor( Qt::yellow );

    #ifdef Q_WS_QWS
        // Qt/Embedded XOR drawing not yet implemented.
        s1->setOpaqueResize( TRUE );
    #endif
        s2->setOpaqueResize( TRUE );
        s3->setOpaqueResize( TRUE );

        a.setMainWidget( s1 );
        s1->setCaption("Qt Example - Splitters");
        s1->show();
        int result = a.exec();
        delete s1;
        return result;
    }

See also Examples.