progressbar-example.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/examples/progressbar/progressbar.doc:5 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Progress Bar</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: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Progress Bar</h1> <p> This example shows how to use a progress bar.<p> <hr><p> Header file:<p> <pre>/****************************************************************************** $Id: qt/progressbar.h 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.*******************************************************************************/#ifndef PROGRESSBAR_H#define PROGRESSBAR_H#include <<a href="qbuttongroup-h.html">qbuttongroup.h</a>>#include <<a href="qtimer-h.html">qtimer.h</a>>class QRadioButton;class QPushButton;class QProgressBar;class ProgressBar : public <a href="qbuttongroup.html">QButtonGroup</a>{ <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>public: ProgressBar( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );protected: <a href="qradiobutton.html">QRadioButton</a> *slow, *normal, *fast; <a href="qpushbutton.html">QPushButton</a> *start, *pause, *reset; <a href="qprogressbar.html">QProgressBar</a> *progress; <a href="qtimer.html">QTimer</a> timer;protected slots: void slotStart(); void slotReset(); void slotTimeout();};#endif</pre><p> <hr><p> Implementation:<p> <pre>/****************************************************************************** $Id: qt/progressbar.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 "progressbar.h"#include <<a href="qradiobutton-h.html">qradiobutton.h</a>>#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>#include <<a href="qprogressbar-h.html">qprogressbar.h</a>>#include <<a href="qlayout-h.html">qlayout.h</a>>#include <<a href="qmotifstyle-h.html">qmotifstyle.h</a>>/* * Constructor * * Creates child widgets of the ProgressBar widget */<a name="f369"></a>ProgressBar::ProgressBar( <a href="qwidget.html">QWidget</a> *parent, const char *name ) : <a href="qbuttongroup.html">QButtonGroup</a>( 0, Horizontal, "Progress Bar", parent, name ), timer(){ <a href="qframe.html#setMargin">setMargin</a>( 10 ); <a href="qgridlayout.html">QGridLayout</a>* toplayout = new <a href="qgridlayout.html">QGridLayout</a>( <a href="qwidget.html#layout">layout</a>(), 2, 2, 5); <a href="qbuttongroup.html#setRadioButtonExclusive">setRadioButtonExclusive</a>( TRUE ); // insert three radiobuttons which the user can use // to set the speed of the progress and two pushbuttons // to start/pause/continue and reset the progress slow = new <a href="qradiobutton.html">QRadioButton</a>( "&Slow", this ); normal = new <a href="qradiobutton.html">QRadioButton</a>( "&Normal", this ); fast = new <a href="qradiobutton.html">QRadioButton</a>( "&Fast", this ); <a href="qvboxlayout.html">QVBoxLayout</a>* vb1 = new <a href="qvboxlayout.html">QVBoxLayout</a>;<a name="x1108"></a> toplayout-><a href="qgridlayout.html#addLayout">addLayout</a>( vb1, 0, 0 ); vb1-><a href="qboxlayout.html#addWidget">addWidget</a>( slow ); vb1-><a href="qboxlayout.html#addWidget">addWidget</a>( normal ); vb1-><a href="qboxlayout.html#addWidget">addWidget</a>( fast ); // two push buttons, one for start, for for reset. start = new <a href="qpushbutton.html">QPushButton</a>( "&Start", this ); reset = new <a href="qpushbutton.html">QPushButton</a>( "&Reset", this ); <a href="qvboxlayout.html">QVBoxLayout</a>* vb2 = new <a href="qvboxlayout.html">QVBoxLayout</a>; toplayout-><a href="qgridlayout.html#addLayout">addLayout</a>( vb2, 0, 1 ); vb2-><a href="qboxlayout.html#addWidget">addWidget</a>( start ); vb2-><a href="qboxlayout.html#addWidget">addWidget</a>( reset ); // Create the progressbar progress = new <a href="qprogressbar.html">QProgressBar</a>( 100, this );<a name="x1119"></a> // progress-><a href="qwidget.html#setStyle">setStyle</a>( new <a href="qmotifstyle.html">QMotifStyle</a>() );<a name="x1109"></a> toplayout-><a href="qgridlayout.html#addMultiCellWidget">addMultiCellWidget</a>( progress, 1, 1, 0, 1 ); // connect the clicked() SIGNALs of the pushbuttons to SLOTs <a href="qobject.html#connect">connect</a>( start, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( slotStart() ) ); <a href="qobject.html#connect">connect</a>( reset, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( slotReset() ) ); // connect the timeout() SIGNAL of the progress-timer to a SLOT <a href="qobject.html#connect">connect</a>( &timer, SIGNAL( timeout() ), this, SLOT( slotTimeout() ) ); // Let's start with normal speed...<a name="x1116"></a> normal-><a href="qradiobutton.html#setChecked">setChecked</a>( TRUE ); // some contraints<a name="x1118"></a> start-><a href="qwidget.html#setFixedWidth">setFixedWidth</a>( 80 ); <a href="qwidget.html#setMinimumWidth">setMinimumWidth</a>( 300 );}/* * SLOT slotStart * * This SLOT is called if the user clicks start/pause/continue * button */void <a name="f370"></a>ProgressBar::slotStart(){ // If the progress bar is at the beginning...<a name="x1110"></a> if ( progress-><a href="qprogressbar.html#progress">progress</a>() == -1 ) { // ...set according to the checked speed-radiobutton // the number of steps which are needed to complete the process<a name="x1115"></a> if ( slow-><a href="qradiobutton.html#isChecked">isChecked</a>() )<a name="x1113"></a> progress-><a href="qprogressbar.html#setTotalSteps">setTotalSteps</a>( 10000 ); else if ( normal-><a href="qradiobutton.html#isChecked">isChecked</a>() ) progress-><a href="qprogressbar.html#setTotalSteps">setTotalSteps</a>( 1000 ); else progress-><a href="qprogressbar.html#setTotalSteps">setTotalSteps</a>( 50 ); // disable the speed-radiobuttons<a name="x1117"></a> slow-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE ); normal-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE ); fast-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE ); } // If the progress is not running... if ( !timer.isActive() ) { // ...start the timer (and so the progress) with a interval of 1 ms... timer.start( 1 ); // ...and rename the start/pause/continue button to Pause<a name="x1107"></a> start-><a href="qbutton.html#setText">setText</a>( "&Pause" ); } else { // if the prgress is running... // ...stop the timer (and so the prgress)... timer.stop(); // ...and rename the start/pause/continue button to Continue start-><a href="qbutton.html#setText">setText</a>( "&Continue" ); }}/* * SLOT slotReset * * This SLOT is called when the user clicks the reset button */void <a name="f371"></a>ProgressBar::slotReset(){ // stop the timer and progress timer.stop(); // rename the start/pause/continue button to Start... start-><a href="qbutton.html#setText">setText</a>( "&Start" ); // ...and enable this button start-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE ); // enable the speed-radiobuttons slow-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE ); normal-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE ); fast-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE ); // reset the progressbar<a name="x1111"></a> progress-><a href="qprogressbar.html#reset">reset</a>();}/* * SLOT slotTimeout * * This SLOT is called each ms when the timer is * active (== progress is running) */void <a name="f372"></a>ProgressBar::slotTimeout(){ int p = progress-><a href="qprogressbar.html#progress">progress</a>();#if 1 // If the progress is complete...<a name="x1114"></a> if ( p == progress-><a href="qprogressbar.html#totalSteps">totalSteps</a>() ) { // ...rename the start/pause/continue button to Start... start-><a href="qbutton.html#setText">setText</a>( "&Start" ); // ...and disable it... start-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE ); // ...and return return; }#endif // If the process is not complete increase it<a name="x1112"></a> progress-><a href="qprogressbar.html#setProgress">setProgress</a>( ++p );}</pre><p> <hr><p> Main:<p> <pre>/****************************************************************************** $Id: qt/main.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 "progressbar.h"#include <<a href="qapplication-h.html">qapplication.h</a>>int main(int argc,char **argv){ <a href="qapplication.html">QApplication</a> a(argc,argv); ProgressBar progressbar; progressbar.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - ProgressBar"); a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(&progressbar); progressbar.<a href="qwidget.html#show">show</a>(); return a.<a href="qapplication.html#exec">exec</a>();}</pre><p>See also <a href="examples.html">Examples</a>.<!-- eof --><p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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