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/****************************************************************************
**
** Copyright (C) 1992-2008 Trolltech ASA. 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 - Layouts");
f.show();
return a.exec();
}
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