progressbar-main-cpp.html
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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 - progressbar/main.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>Progress Bar</h1><br clear="all"> This example shows how to use a progressbar. <hr> Header file: <pre>/****************************************************************************** $Id: qt/examples/progressbar/progressbar.h 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.*******************************************************************************/#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 QButtonGroup{ Q_OBJECTpublic: 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> <hr> Implementation: <pre>/****************************************************************************** $Id: qt/examples/progressbar/progressbar.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 "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>>/* * Constructor * * Creates child widgets of the ProgressBar widget */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#b11d00">setMargin</a>( 10 ); <a href="qgridlayout.html">QGridLayout</a>* toplayout = new <a href="qgridlayout.html">QGridLayout</a>( <a href="qwidget.html#839758">layout</a>(), 2, 2, 5); <a href="qbuttongroup.html#d67431">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>; toplayout-><a href="qgridlayout.html#a409bc">addLayout</a>( vb1, 0, 0 ); vb1-><a href="qboxlayout.html#ebba99">addWidget</a>( slow ); vb1-><a href="qboxlayout.html#ebba99">addWidget</a>( normal ); vb1-><a href="qboxlayout.html#ebba99">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#a409bc">addLayout</a>( vb2, 0, 1 ); vb2-><a href="qboxlayout.html#ebba99">addWidget</a>( start ); vb2-><a href="qboxlayout.html#ebba99">addWidget</a>( reset ); // Create the progressbar progress = new <a href="qprogressbar.html">QProgressBar</a>( 100, this ); toplayout-><a href="qgridlayout.html#92faca">addMultiCellWidget</a>( progress, 1, 1, 0, 1 ); // connect the clicked() SIGNALs of the pushbuttons to SLOTs <a href="qobject.html#fbde73">connect</a>( start, SIGNAL( <a href="qbuttongroup.html#c8e107">clicked</a>() ), this, SLOT( <a href=#128>slotStart</a>() ) ); <a href="qobject.html#fbde73">connect</a>( reset, SIGNAL( <a href="qbuttongroup.html#c8e107">clicked</a>() ), this, SLOT( <a href=#129>slotReset</a>() ) ); // connect the timeout() SIGNAL of the progress-timer to a SLOT <a href="qobject.html#fbde73">connect</a>( &timer, SIGNAL( timeout() ), this, SLOT( <a href=#130>slotTimeout</a>() ) ); // Let's start with normal speed... normal->setChecked( TRUE ); // some contraints start->setFixedWidth( 80 ); <a href="qwidget.html#893704">setMinimumWidth</a>( 300 );}/* * SLOT slotStart * * This SLOT is called if the user clicks start/pause/continue * button */void <a name="128"></a>ProgressBar::slotStart(){ // If the progress bar is at the beginning... if ( progress->progress() == -1 ) { // ...set according to the checked speed-radiobutton // the number of steps which are needed to complete the process if ( slow->isChecked() ) progress->setTotalSteps( 10000 ); else if ( normal->isChecked() ) progress->setTotalSteps( 1000 ); else progress->setTotalSteps( 50 ); // disable the speed-radiobuttons slow->setEnabled( FALSE ); normal->setEnabled( FALSE ); fast->setEnabled( 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 start->setText( "&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->setText( "&Continue" ); }}/* * SLOT slotReset * * This SLOT is called when the user clicks the reset button */void <a name="129"></a>ProgressBar::slotReset(){ // stop the timer and progress timer.stop(); // rename the start/pause/continue button to Start... start->setText( "&Start" ); // ...and enable this button start->setEnabled( TRUE ); // enable the speed-radiobuttons slow->setEnabled( TRUE ); normal->setEnabled( TRUE ); fast->setEnabled( TRUE ); // reset the progressbar progress->reset();}/* * SLOT slotTimeout * * This SLOT is called each ms when the timer is * active (== progress is running) */void <a name="130"></a>ProgressBar::slotTimeout(){ int p = progress->progress(); // If the progress is complete... if ( p == progress->totalSteps() ) { // ...rename the start/pause/continue button to Start... start->setText( "&Start" ); // ...and disable it... start->setEnabled( FALSE ); // ...and return return; } // If the process is not complete increase it progress->setProgress( ++p );}</pre> <hr> Main:<pre>/****************************************************************************** $Id: qt/examples/progressbar/main.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 "progressbar.h"#include <<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>int main(int argc,char **argv){ <a name="QApplication"></a><a href="qapplication.html">QApplication</a> a(argc,argv); ProgressBar progressbar; progressbar.<a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>("Qt Example - ProgressBar"); a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>(&progressbar); progressbar.<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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