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175 lines
4.6 KiB
175 lines
4.6 KiB
/***************************************************************************
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* $Id$
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**
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* Copyright (C) 1992-2000 Trolltech AS. 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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import org.kde.qt.*;
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class ProgressBar extends QButtonGroup
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{
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protected QRadioButton slow, normal, fast;
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protected QPushButton start, pause, reset;
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protected QProgressBar progress;
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protected QTimer timer;
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/*
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Constructor
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*
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Creates child widgets of the ProgressBar widget
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*/
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ProgressBar( )
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{
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this(null, null);
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}
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ProgressBar( QWidget parent, String name )
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{
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super( 0, Horizontal, "Progress Bar", parent, name );
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timer = new QTimer();
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setMargin( 10 );
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QGridLayout toplayout = new QGridLayout( layout(), 2, 2, 5);
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setRadioButtonExclusive( true );
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// insert three radiobuttons which the user can use
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// to set the speed of the progress and two pushbuttons
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// to start/pause/continue and reset the progress
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slow = new QRadioButton( "&Slow", this );
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normal = new QRadioButton( "&Normal", this );
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fast = new QRadioButton( "&Fast", this );
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QVBoxLayout vb1 = new QVBoxLayout();
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toplayout.addLayout( vb1, 0, 0 );
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vb1.addWidget( slow );
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vb1.addWidget( normal );
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vb1.addWidget( fast );
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// two push buttons, one for start, for for reset.
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start = new QPushButton( "&Start", this );
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reset = new QPushButton( "&Reset", this );
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QVBoxLayout vb2 = new QVBoxLayout();
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toplayout.addLayout( vb2, 0, 1 );
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vb2.addWidget( start );
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vb2.addWidget( reset );
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// Create the progressbar
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progress = new QProgressBar( 100, this );
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// progress.setStyle( new QMotifStyle() );
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toplayout.addMultiCellWidget( progress, 1, 1, 0, 1 );
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// connect the clicked() SIGNALs of the pushbuttons to SLOTs
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connect( start, SIGNAL(" clicked()"), this, SLOT(" slotStart()") );
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connect( reset, SIGNAL(" clicked()"), this, SLOT(" slotReset()") );
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// connect the timeout() SIGNAL of the progress-timer to a SLOT
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connect( timer, SIGNAL(" timeout()"), this, SLOT(" slotTimeout()") );
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// Let's start with normal speed...
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normal.setChecked( true );
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// some contraints
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start.setFixedWidth( 80 );
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setMinimumWidth( 300 );
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}
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/*
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SLOT slotStart
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*
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This SLOT is called if the user clicks start/pause/continue
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button
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*/
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void slotStart()
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{
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// If the progress bar is at the beginning...
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if ( progress.progress() == -1 ) {
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// ...set according to the checked speed-radiobutton
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// the number of steps which are needed to complete the process
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if ( slow.isChecked() )
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progress.setTotalSteps( 10000 );
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else if ( normal.isChecked() )
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progress.setTotalSteps( 1000 );
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else
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progress.setTotalSteps( 50 );
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// disable the speed-radiobuttons
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slow.setEnabled( false );
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normal.setEnabled( false );
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fast.setEnabled( false );
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}
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// If the progress is not running...
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if ( !timer.isActive() ) {
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// ...start the timer (and so the progress) with a interval of 1 ms...
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timer.start( 1 );
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// ...and rename the start/pause/continue button to Pause
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start.setText( "&Pause" );
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} else { // if the prgress is running...
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// ...stop the timer (and so the prgress)...
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timer.stop();
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// ...and rename the start/pause/continue button to Continue
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start.setText( "&Continue" );
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}
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}
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/*
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SLOT slotReset
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*
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This SLOT is called when the user clicks the reset button
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*/
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void slotReset()
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{
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// stop the timer and progress
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timer.stop();
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// rename the start/pause/continue button to Start...
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start.setText( "&Start" );
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// ...and enable this button
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start.setEnabled( true );
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// enable the speed-radiobuttons
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slow.setEnabled( true );
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normal.setEnabled( true );
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fast.setEnabled( true );
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// reset the progressbar
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progress.reset();
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}
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/*
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SLOT slotTimeout
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*
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This SLOT is called each ms when the timer is
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active (== progress is running)
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*/
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void slotTimeout()
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{
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int p = progress.progress();
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// If the progress is complete...
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if ( p == progress.totalSteps() ) {
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// ...rename the start/pause/continue button to Start...
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start.setText( "&Start" );
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// ...and disable it...
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start.setEnabled( false );
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// ...and return
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return;
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}
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// If the process is not complete increase it
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progress.setProgress( ++p );
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}
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}
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