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																								Layout Managers								h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }				a:link { color: #004faf; text-decoration: none }				a:visited { color: #672967; text-decoration: none }				body { background: #ffffff; color: black; }				-->																												 				Home				 | 				All Classes				 | 				Main Classes				 | 				Annotated				 | 				Grouped Classes				 | 				Functions								Layout Managers								   				 				This example shows simple and intermediate use of Qt's layout				classes, QGridLayout, QBoxLayout etc.				 				 Implementation:				 /****************************************************************************				** $Id:  qt/layout.cpp   3.0.5   edited Oct 12 2001 $				**				** 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 <qcolor.h>				#include <qpushbutton.h>				#include <qlayout.h>				#include <qlineedit.h>				#include <qmultilineedit.h>				#include <qmenubar.h>				#include <qpopupmenu.h>								class ExampleWidget : public QWidget				{				public:				    ExampleWidget( QWidget *parent = 0, const char *name = 0 );				    ~ExampleWidget();				};								ExampleWidget::ExampleWidget( QWidget *parent, const char *name )				    : QWidget( parent, name )				{				    // Make the top-level layout; a vertical box to contain all widgets				    // and sub-layouts.				    QBoxLayout *topLayout = new QVBoxLayout( this, 5 );								    // Create a menubar...				    QMenuBar *menubar = new QMenuBar( this );				    menubar->setSeparator( QMenuBar::InWindowsStyle );				    QPopupMenu* popup;				    popup = new QPopupMenu( this );				    popup->insertItem( "&Quit", qApp, SLOT(quit()) );				    menubar->insertItem( "&File", popup );								    // ...and tell the layout about it.				    topLayout->setMenuBar( menubar );								    // Make an hbox that will hold a row of buttons.				    QBoxLayout *buttons = new QHBoxLayout( topLayout );				    int i;				    for ( i = 1; i <= 4; i++ ) {				        QPushButton* but = new QPushButton( this );				        QString s;				        s.sprintf( "Button %d", i );				        but->setText( s );								        // Set horizontal stretch factor to 10 to let the buttons				        // stretch horizontally. The buttons will not stretch				        // vertically, since bigWidget below will take up vertical				        // stretch.				        buttons->addWidget( but, 10 );				        // (Actually, the result would have been the same with a				        // stretch factor of 0; if no items in a layout have non-zero				        // stretch, the space is divided equally between members.)				    }								    // Make another hbox that will hold a left-justified row of buttons.				    QBoxLayout *buttons2 = new QHBoxLayout( topLayout );								    QPushButton* but = new QPushButton( "Button five", this );				    buttons2->addWidget( but );								    but = new QPushButton( "Button 6", this );				    buttons2->addWidget( but );								    // Fill up the rest of the hbox with stretchable space, so that				    // the buttons get their minimum width and are pushed to the left.				    buttons2->addStretch( 10 );								    // Make  a big widget that will grab all space in the middle.				    QMultiLineEdit *bigWidget = new QMultiLineEdit( this );				    bigWidget->setText( "This widget will get all the remaining space" );				    bigWidget->setFrameStyle( QFrame::Panel | QFrame::Plain );								    // Set vertical stretch factor to 10 to let the bigWidget stretch				    // vertically. It will stretch horizontally because there are no				    // widgets beside it to take up horizontal stretch.				    //    topLayout->addWidget( bigWidget, 10 );				    topLayout->addWidget( bigWidget );								    // Make a grid that will hold a vertical table of QLabel/QLineEdit				    // pairs next to a large QMultiLineEdit.								    // Don't use hard-coded row/column numbers in QGridLayout, you'll				    // regret it when you have to change the layout.				    const int numRows = 3;				    const int labelCol = 0;				    const int linedCol = 1;				    const int multiCol = 2;								    // Let the grid-layout have a spacing of 10 pixels between				    // widgets, overriding the default from topLayout.				    QGridLayout *grid = new QGridLayout( topLayout, 0, 0, 10 );				    int row;								    for ( row = 0; row < numRows; row++ ) {				        QLineEdit *ed = new QLineEdit( this );				        // The line edit goes in the second column				        grid->addWidget( ed, row, linedCol );								        // Make a label that is a buddy of the line edit				        QString s;				        s.sprintf( "Line &%d", row+1 );				        QLabel *label = new QLabel( ed, s, this );				        // The label goes in the first column.				        grid->addWidget( label, row, labelCol );				    }								    // The multiline edit will cover the entire vertical range of the				    // grid (rows 0 to numRows) and stay in column 2.								    QMultiLineEdit *med = new QMultiLineEdit( this );				    grid->addMultiCellWidget( med, 0, -1, multiCol, multiCol );								    // The labels will take the space they need. Let the remaining				    // horizontal space be shared so that the multiline edit gets				    // twice as much as the line edit.				    grid->setColStretch( linedCol, 10 );				    grid->setColStretch( multiCol, 20 );								    // Add a widget at the bottom.				    QLabel* sb = new QLabel( this );				    sb->setText( "Let's pretend this is a status bar" );				    sb->setFrameStyle( QFrame::Panel | QFrame::Sunken );				    // This widget will use all horizontal space, and have a fixed height.								    // we should have made a subclass and implemented sizePolicy there...				    sb->setFixedHeight( sb->sizeHint().height() );								    sb->setAlignment( AlignVCenter | AlignLeft );				    topLayout->addWidget( sb );								    topLayout->activate();				}								ExampleWidget::~ExampleWidget()				{				    // All child widgets are deleted by Qt.				    // The top-level layout and all its sub-layouts are deleted by Qt.				}								int main( int argc, char **argv )				{				    QApplication a( argc, argv );								    ExampleWidget f;				    a.setMainWidget(&f);				    f.setCaption("Qt Example - Caption");				    f.show();								    return a.exec();				}												See also Examples.																				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