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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Toolkit - layout/layout.cpp example file</title><style type="text/css"><!--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: white; color: black; }--></style></head><body bgcolor="#ffffff"><table width="100%"><tr><td><a href="index.html"><img width="100" height="100" src="qtlogo.png"alt="Home" border="0"><img width="100"height="100" src="face.png" alt="Home" border="0"></a><td valign="top"><div align="right"><img src="dochead.png" width="472" height="27"><br><a href="classes.html"><b>Classes</b></a>- <a href="annotated.html">Annotated</a>- <a href="hierarchy.html">Tree</a>- <a href="functions.html">Functions</a>- <a href="index.html">Home</a>- <a href="topicals.html"><b>Structure</b> <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" align="center" size=32>Qte</font></a></div></table><h1 align=center>Layout Managers</h1><br clear="all"> This example shows simple and intermediate use of Qt's layout classes, QGridLayout, QBoxLayout etc. <hr> Implementation:<pre>/****************************************************************************** $Id: qt/examples/layout/layout.cpp 2.3.8 edited 2004-05-12 $**** 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 <<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>#include <<a name="qlabel.h"></a><a href="qlabel-h.html">qlabel.h</a>>#include <<a name="qcolor.h"></a><a href="qcolor-h.html">qcolor.h</a>>#include <<a name="qpushbutton.h"></a><a href="qpushbutton-h.html">qpushbutton.h</a>>#include <<a name="qlayout.h"></a><a href="qlayout-h.html">qlayout.h</a>>#include <<a name="qlineedit.h"></a><a href="qlineedit-h.html">qlineedit.h</a>>#include <<a name="qmultilineedit.h"></a><a href="qmultilineedit-h.html">qmultilineedit.h</a>>#include <<a name="qmenubar.h"></a><a href="qmenubar-h.html">qmenubar.h</a>>#include <<a name="qpopupmenu.h"></a><a href="qpopupmenu-h.html">qpopupmenu.h</a>>class ExampleWidget : public QWidget{public: ExampleWidget( <a name="QWidget"></a><a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 ); ~ExampleWidget();private:};ExampleWidget::ExampleWidget( <a href="qwidget.html">QWidget</a> *parent, const char *name ) : <a href="qwidget.html">QWidget</a>( parent, name ){ // Make the top-level layout; a vertical box to contain all widgets // and sub-layouts. <a name="QBoxLayout"></a><a href="qboxlayout.html">QBoxLayout</a> *topLayout = new <a name="QVBoxLayout"></a><a href="qvboxlayout.html">QVBoxLayout</a>( this, 5 ); // Create a menubar... <a name="QMenuBar"></a><a href="qmenubar.html">QMenuBar</a> *menubar = new <a href="qmenubar.html">QMenuBar</a>( this ); menubar-><a name="setSeparator"></a><a href="qmenubar.html#815978">setSeparator</a>( QMenuBar::InWindowsStyle ); <a name="QPopupMenu"></a><a href="qpopupmenu.html">QPopupMenu</a>* popup; popup = new <a href="qpopupmenu.html">QPopupMenu</a>( this ); popup-><a name="insertItem"></a><a href="qmenudata.html#deddb9">insertItem</a>( "&Quit", qApp, SLOT(quit()) ); menubar-><a href="qmenudata.html#deddb9">insertItem</a>( "&File", popup ); // ...and tell the layout about it. topLayout->setMenuBar( menubar ); // Make an hbox that will hold a row of buttons. <a name="QBoxLayout"></a><a href="qboxlayout.html#5b6ca2">QBoxLayout</a> *buttons = new <a name="QHBoxLayout"></a><a href="qhboxlayout.html">QHBoxLayout</a>( topLayout); int i; for ( i = 1; i <= 4; i++ ) { <a name="QPushButton"></a><a href="qpushbutton.html">QPushButton</a>* but = new <a href="qpushbutton.html">QPushButton</a>( this ); <a name="QString"></a><a href="qstring.html">QString</a> s; s.<a name="sprintf"></a><a href="qstring.html#926f67">sprintf</a>( "Button %d", i ); but-><a name="setText"></a><a href="qbutton.html#989f4f">setText</a>( 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. <a href="qboxlayout.html#5b6ca2">QBoxLayout</a> *buttons2 = new <a href="qhboxlayout.html">QHBoxLayout</a>( topLayout ); <a href="qpushbutton.html">QPushButton</a>* but = new <a href="qpushbutton.html">QPushButton</a>( "Button five", this ); buttons2-><a name="addWidget"></a><a href="qboxlayout.html#ebba99">addWidget</a>( but ); but = new <a href="qpushbutton.html">QPushButton</a>( "Button 6", this ); buttons2-><a href="qboxlayout.html#ebba99">addWidget</a>( 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. <a name="QMultiLineEdit"></a><a href="qmultilineedit.html">QMultiLineEdit</a> *bigWidget = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this ); bigWidget-><a name="setText"></a><a href="qmultilineedit.html#3fd8c1">setText</a>( "This widget will get all the remaining space" ); bigWidget-><a name="setFrameStyle"></a><a href="qframe.html#558f79">setFrameStyle</a>( 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-><a href="qboxlayout.html#ebba99">addWidget</a>( bigWidget, 10 ); topLayout-><a href="qboxlayout.html#ebba99">addWidget</a>( 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. <a name="QGridLayout"></a><a href="qgridlayout.html">QGridLayout</a> *grid = new <a href="qgridlayout.html">QGridLayout</a>( topLayout, 0, 0, 10 ); int row; for ( row = 0; row < numRows; row++ ) { <a name="QLineEdit"></a><a href="qlineedit.html">QLineEdit</a> *ed = new <a href="qlineedit.html">QLineEdit</a>( this ); // The line edit goes in the second column grid-><a name="addWidget"></a><a href="qgridlayout.html#dac29c">addWidget</a>( ed, row, linedCol ); // Make a label that is a buddy of the line edit <a href="qstring.html">QString</a> s; s.<a href="qstring.html#926f67">sprintf</a>( "Line &%d", row+1 ); <a name="QLabel"></a><a href="qlabel.html">QLabel</a> *label = new <a href="qlabel.html">QLabel</a>( 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. <a href="qmultilineedit.html">QMultiLineEdit</a> *med = new <a href="qmultilineedit.html">QMultiLineEdit</a>( this ); grid-><a name="addMultiCellWidget"></a><a href="qgridlayout.html#92faca">addMultiCellWidget</a>( 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-><a name="setColStretch"></a><a href="qgridlayout.html#df80c4">setColStretch</a>( multiCol, 20 ); // Add a widget at the bottom. <a href="qlabel.html">QLabel</a>* sb = new <a href="qlabel.html">QLabel</a>( this ); sb-><a name="setText"></a><a href="qlabel.html#bc5ea6">setText</a>("Let's pretend this is a status bar"); sb-><a href="qframe.html#558f79">setFrameStyle</a>( 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-><a name="setFixedHeight"></a><a href="qwidget.html#5e7ab2">setFixedHeight</a>( sb-><a name="sizeHint"></a><a href="qlabel.html#f40fcc">sizeHint</a>().height() ); sb-><a name="setAlignment"></a><a href="qlabel.html#4743c8">setAlignment</a>( AlignVCenter | AlignLeft ); topLayout-><a href="qboxlayout.html#ebba99">addWidget</a>( sb ); topLayout-><a name="activate"></a><a href="qlayout.html#1cb33d">activate</a>();}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 ){ <a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv ); ExampleWidget f; a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>(&f); f.<a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>("Qt Example - Caption"); f.<a name="show"></a><a href="qwidget.html#200ee5">show</a>(); return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();}</pre><p><address><hr><div align="center"><table width="100%" cellspacing="0" border="0"><tr><td>Copyright ⌨️ 快捷键说明
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