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212 lines
10 KiB
212 lines
10 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/layout/layout.doc:4 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Layout Managers</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Annotated</font></a>
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<font color="#004faf">Grouped Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Layout Managers</h1>
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<p>
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This example shows simple and intermediate use of Qt's layout
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classes, <a href="qgridlayout.html">QGridLayout</a>, <a href="qboxlayout.html">QBoxLayout</a> etc.
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/layout.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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#include <<a href="qlabel-h.html">qlabel.h</a>>
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#include <<a href="qcolor-h.html">qcolor.h</a>>
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#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
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#include <<a href="qlayout-h.html">qlayout.h</a>>
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#include <<a href="qlineedit-h.html">qlineedit.h</a>>
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#include <<a href="qmultilineedit-h.html">qmultilineedit.h</a>>
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#include <<a href="qmenubar-h.html">qmenubar.h</a>>
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#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
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class ExampleWidget : public <a href="qwidget.html">QWidget</a>
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{
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public:
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ExampleWidget( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
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~ExampleWidget();
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};
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<a name="f260"></a>ExampleWidget::ExampleWidget( <a href="qwidget.html">QWidget</a> *parent, const char *name )
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: <a href="qwidget.html">QWidget</a>( parent, name )
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{
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// Make the top-level layout; a vertical box to contain all widgets
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// and sub-layouts.
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<a href="qboxlayout.html">QBoxLayout</a> *topLayout = new <a href="qvboxlayout.html">QVBoxLayout</a>( this, 5 );
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// Create a menubar...
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<a href="qmenubar.html">QMenuBar</a> *menubar = new <a href="qmenubar.html">QMenuBar</a>( this );
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<a name="x540"></a> menubar-><a href="qmenubar.html#setSeparator">setSeparator</a>( QMenuBar::InWindowsStyle );
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<a href="qpopupmenu.html">QPopupMenu</a>* popup;
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popup = new <a href="qpopupmenu.html">QPopupMenu</a>( this );
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popup-><a href="qmenudata.html#insertItem">insertItem</a>( "&Quit", qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
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menubar-><a href="qmenudata.html#insertItem">insertItem</a>( "&File", popup );
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// ...and tell the layout about it.
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<a name="x539"></a> topLayout-><a href="qlayout.html#setMenuBar">setMenuBar</a>( menubar );
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// Make an hbox that will hold a row of buttons.
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<a href="qboxlayout.html">QBoxLayout</a> *buttons = new <a href="qhboxlayout.html">QHBoxLayout</a>( topLayout );
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int i;
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for ( i = 1; i <= 4; i++ ) {
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<a href="qpushbutton.html">QPushButton</a>* but = new <a href="qpushbutton.html">QPushButton</a>( this );
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<a href="qstring.html">QString</a> s;
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<a name="x542"></a> s.<a href="qstring.html#sprintf">sprintf</a>( "Button %d", i );
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<a name="x530"></a> but-><a href="qbutton.html#setText">setText</a>( s );
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// Set horizontal <a href="layout.html#stretch-factor">stretch factor</a> to 10 to let the buttons
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// stretch horizontally. The buttons will not stretch
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// vertically, since bigWidget below will take up vertical
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// stretch.
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<a name="x529"></a> buttons-><a href="qboxlayout.html#addWidget">addWidget</a>( but, 10 );
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// (Actually, the result would have been the same with a
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// stretch factor of 0; if no items in a layout have non-zero
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// stretch, the space is divided equally between members.)
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}
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// Make another hbox that will hold a left-justified row of buttons.
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<a href="qboxlayout.html">QBoxLayout</a> *buttons2 = new <a href="qhboxlayout.html">QHBoxLayout</a>( topLayout );
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<a href="qpushbutton.html">QPushButton</a>* but = new <a href="qpushbutton.html">QPushButton</a>( "Button five", this );
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buttons2-><a href="qboxlayout.html#addWidget">addWidget</a>( but );
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but = new <a href="qpushbutton.html">QPushButton</a>( "Button 6", this );
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buttons2-><a href="qboxlayout.html#addWidget">addWidget</a>( but );
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// Fill up the rest of the hbox with stretchable space, so that
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// the buttons get their minimum width and are pushed to the left.
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<a name="x528"></a> buttons2-><a href="qboxlayout.html#addStretch">addStretch</a>( 10 );
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// Make a big widget that will grab all space in the middle.
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<a href="qmultilineedit.html">QMultiLineEdit</a> *bigWidget = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this );
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bigWidget-><a href="qtextedit.html#setText">setText</a>( "This widget will get all the remaining space" );
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<a name="x531"></a> bigWidget-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Plain );
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// Set vertical stretch factor to 10 to let the bigWidget stretch
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// vertically. It will stretch horizontally because there are no
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// widgets beside it to take up horizontal stretch.
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// topLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( bigWidget, 10 );
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topLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( bigWidget );
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// Make a grid that will hold a vertical table of QLabel/QLineEdit
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// pairs next to a large QMultiLineEdit.
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// Don't use hard-coded row/column numbers in QGridLayout, you'll
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// regret it when you have to change the layout.
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const int numRows = 3;
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const int labelCol = 0;
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const int linedCol = 1;
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const int multiCol = 2;
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// Let the grid-layout have a spacing of 10 pixels between
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// widgets, overriding the default from topLayout.
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<a href="qgridlayout.html">QGridLayout</a> *grid = new <a href="qgridlayout.html">QGridLayout</a>( topLayout, 0, 0, 10 );
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int row;
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for ( row = 0; row < numRows; row++ ) {
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<a href="qlineedit.html">QLineEdit</a> *ed = new <a href="qlineedit.html">QLineEdit</a>( this );
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// The line edit goes in the second column
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<a name="x533"></a> grid-><a href="qgridlayout.html#addWidget">addWidget</a>( ed, row, linedCol );
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// Make a label that is a buddy of the line edit
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<a href="qstring.html">QString</a> s;
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s.<a href="qstring.html#sprintf">sprintf</a>( "Line &%d", row+1 );
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<a href="qlabel.html">QLabel</a> *label = new <a href="qlabel.html">QLabel</a>( ed, s, this );
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// The label goes in the first column.
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grid-><a href="qgridlayout.html#addWidget">addWidget</a>( label, row, labelCol );
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}
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// The multiline edit will cover the entire vertical range of the
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// grid (rows 0 to numRows) and stay in column 2.
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<a href="qmultilineedit.html">QMultiLineEdit</a> *med = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this );
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<a name="x532"></a> grid-><a href="qgridlayout.html#addMultiCellWidget">addMultiCellWidget</a>( med, 0, -1, multiCol, multiCol );
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// The labels will take the space they need. Let the remaining
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// horizontal space be shared so that the multiline edit gets
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// twice as much as the line edit.
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<a name="x534"></a> grid-><a href="qgridlayout.html#setColStretch">setColStretch</a>( linedCol, 10 );
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grid-><a href="qgridlayout.html#setColStretch">setColStretch</a>( multiCol, 20 );
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// Add a widget at the bottom.
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<a href="qlabel.html">QLabel</a>* sb = new <a href="qlabel.html">QLabel</a>( this );
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sb-><a href="qlabel.html#setText">setText</a>( "Let's pretend this is a status bar" );
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sb-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Sunken );
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// This widget will use all horizontal space, and have a fixed height.
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// we should have made a subclass and implemented sizePolicy there...
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<a name="x545"></a><a name="x537"></a> sb-><a href="qwidget.html#setFixedHeight">setFixedHeight</a>( sb-><a href="qwidget.html#sizeHint">sizeHint</a>().height() );
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<a name="x535"></a> sb-><a href="qlabel.html#setAlignment">setAlignment</a>( AlignVCenter | AlignLeft );
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topLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( sb );
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<a name="x538"></a> topLayout-><a href="qlayout.html#activate">activate</a>();
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}
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ExampleWidget::~ExampleWidget()
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{
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// All child widgets are deleted by Qt.
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// The top-level layout and all its sub-layouts are deleted by Qt.
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}
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int main( int argc, char **argv )
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{
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<a href="qapplication.html">QApplication</a> a( argc, argv );
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ExampleWidget f;
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a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(&f);
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f.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Layouts");
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f.<a href="qwidget.html#show">show</a>();
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return a.<a href="qapplication.html#exec">exec</a>();
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}
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</pre>
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<p>See also <a href="examples.html">Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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