interface_widgets.cpp 18 KB
Newer Older
1
/*****************************************************************************
2
 * interface_widgets.cpp : Custom widgets for the main interface
3
 ****************************************************************************
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
4
 * Copyright (C) 2006-2010 the VideoLAN team
5
 * $Id$
6 7
 *
 * Authors: Clément Stenac <zorglub@videolan.org>
8
 *          Jean-Baptiste Kempf <jb@videolan.org>
9
 *          Rafaël Carré <funman@videolanorg>
10
 *          Ilkka Ollakka <ileoo@videolan.org>
11 12 13 14
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
15
 * ( at your option ) any later version.
16 17 18 19 20 21 22 23 24 25
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/
26

27 28 29
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
30

31
#include "components/interface_widgets.hpp"
32 33
#include "dialogs_provider.hpp"
#include "util/customwidgets.hpp"               // qtEventToVLCKey, QVLCStackedWidget
34 35 36 37

#include "menus.hpp"             /* Popup menu on bgWidget */

#include <vlc_vout.h>
38

Clément Stenac's avatar
Clément Stenac committed
39
#include <QLabel>
40
#include <QToolButton>
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
41
#include <QPalette>
42
#include <QEvent>
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
43
#include <QResizeEvent>
44
#include <QDate>
45 46
#include <QMenu>
#include <QWidgetAction>
47
#include <QDesktopWidget>
48
#include <QPainter>
49
#include <QTimer>
50
#include <QSlider>
François Cartegnie's avatar
François Cartegnie committed
51
#include <QBitmap>
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
52

53
#ifdef Q_WS_X11
54 55
#   include <X11/Xlib.h>
#   include <qx11info_x11.h>
56
#endif
57

58
#include <math.h>
59
#include <assert.h>
60

61 62 63 64
/**********************************************************************
 * Video Widget. A simple frame on which video is drawn
 * This class handles resize issues
 **********************************************************************/
65

66
VideoWidget::VideoWidget( intf_thread_t *_p_i )
67
            : QFrame( NULL ) , p_intf( _p_i )
68
{
69
    /* Set the policy to expand in both directions */
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
70
    // setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
71

72 73
    layout = new QHBoxLayout( this );
    layout->setContentsMargins( 0, 0, 0, 0 );
74
    stable = NULL;
75
    show();
76 77 78 79
}

VideoWidget::~VideoWidget()
{
80
    /* Ensure we are not leaking the video output. This would crash. */
81 82 83 84 85 86 87 88 89 90 91
    assert( !stable );
}

void VideoWidget::sync( void )
{
#ifdef Q_WS_X11
    /* Make sure the X server has processed all requests.
     * This protects other threads using distinct connections from getting
     * the video widget window in an inconsistent states. */
    XSync( QX11Info::display(), False );
#endif
92 93
}

94
/**
95
 * Request the video to avoid the conflicts
96
 **/
97
WId VideoWidget::request( int *pi_x, int *pi_y,
98 99
                          unsigned int *pi_width, unsigned int *pi_height,
                          bool b_keep_size )
100
{
101
    msg_Dbg( p_intf, "Video was requested %i, %i", *pi_x, *pi_y );
102

103
    if( stable )
104 105
    {
        msg_Dbg( p_intf, "embedded video already in use" );
Hugo Beauzée-Luyssen's avatar
Hugo Beauzée-Luyssen committed
106
        return 0;
107
    }
108 109 110 111 112 113
    if( b_keep_size )
    {
        *pi_width  = size().width();
        *pi_height = size().height();
    }

114 115 116
    /* The owner of the video window needs a stable handle (WinId). Reparenting
     * in Qt4-X11 changes the WinId of the widget, so we need to create another
     * dummy widget that stays within the reparentable widget. */
117
    stable = new QWidget();
118 119 120 121
    QPalette plt = palette();
    plt.setColor( QPalette::Window, Qt::black );
    stable->setPalette( plt );
    stable->setAutoFillBackground(true);
122 123 124
    /* Indicates that the widget wants to draw directly onto the screen.
       Widgets with this attribute set do not participate in composition
       management */
125 126 127
    /* This is currently disabled on X11 as it does not seem to improve
     * performance, but causes the video widget to be transparent... */
#ifndef Q_WS_X11
128
    stable->setAttribute( Qt::WA_PaintOnScreen, true );
129
#endif
130

131
    layout->addWidget( stable );
132

133
#ifdef Q_WS_X11
134
    /* HACK: Only one X11 client can subscribe to mouse button press events.
135
     * VLC currently handles those in the video display.
136
     * Force Qt4 to unsubscribe from mouse press and release events. */
137 138 139 140 141
    Display *dpy = QX11Info::display();
    Window w = stable->winId();
    XWindowAttributes attr;

    XGetWindowAttributes( dpy, w, &attr );
142 143
    attr.your_event_mask &= ~(ButtonPressMask|ButtonReleaseMask);
    XSelectInput( dpy, w, attr.your_event_mask );
144
#endif
145
    sync();
146
#ifndef NDEBUG
147 148
    msg_Dbg( p_intf, "embedded video ready (handle %p)",
             (void *)stable->winId() );
149
#endif
150
    return stable->winId();
151 152
}

153
/* Set the Widget to the correct Size */
154
/* Function has to be called by the parent
Rémi Denis-Courmont's avatar
typo  
Rémi Denis-Courmont committed
155
   Parent has to care about resizing itself */
156
void VideoWidget::SetSizing( unsigned int w, unsigned int h )
157
{
158 159
    resize( w, h );
    emit sizeChanged( w, h );
160 161 162 163 164 165 166
    /* Work-around a bug?misconception? that would happen when vout core resize
       twice to the same size and would make the vout not centered.
       This cause a small flicker.
       See #3621
     */
    if( size().width() == w && size().height() == h )
        updateGeometry();
167
    sync();
168 169
}

170
void VideoWidget::release( void )
171
{
Rémi Denis-Courmont's avatar
Typo  
Rémi Denis-Courmont committed
172
    msg_Dbg( p_intf, "Video is not needed anymore" );
173

174 175 176 177 178 179
    if( stable )
    {
        layout->removeWidget( stable );
        stable->deleteLater();
        stable = NULL;
    }
180

181
    updateGeometry();
182
}
183

184 185
/**********************************************************************
 * Background Widget. Show a simple image background. Currently,
186
 * it's album art if present or cone.
187
 **********************************************************************/
188

189
BackgroundWidget::BackgroundWidget( intf_thread_t *_p_i )
François Cartegnie's avatar
François Cartegnie committed
190
                 :QWidget( NULL ), p_intf( _p_i ), b_expandPixmap( false )
191
{
192
    /* A dark background */
Clément Stenac's avatar
Clément Stenac committed
193
    setAutoFillBackground( true );
194
    QPalette plt = palette();
195 196 197 198
    plt.setColor( QPalette::Active, QPalette::Window , Qt::black );
    plt.setColor( QPalette::Inactive, QPalette::Window , Qt::black );
    setPalette( plt );

Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
199 200 201
    /* Init the cone art */
    updateArt( "" );

202
    CONNECT( THEMIM->getIM(), artChanged( QString ),
203
             this, updateArt( const QString& ) );
204 205
}

206
void BackgroundWidget::updateArt( const QString& url )
207
{
François Cartegnie's avatar
François Cartegnie committed
208
    if ( !url.isEmpty() )
Ilkka Ollakka's avatar
 
Ilkka Ollakka committed
209
    {
François Cartegnie's avatar
François Cartegnie committed
210 211 212 213
        pixmapUrl = url;
    }
    else
    {   /* Xmas joke */
214
        if( QDate::currentDate().dayOfYear() >= 354 )
François Cartegnie's avatar
François Cartegnie committed
215
            pixmapUrl = QString( ":/logo/vlc128-christmas.png" );
216
        else
François Cartegnie's avatar
François Cartegnie committed
217
            pixmapUrl = QString( ":/logo/vlc128.png" );
Ilkka Ollakka's avatar
 
Ilkka Ollakka committed
218
    }
219
    update();
François Cartegnie's avatar
François Cartegnie committed
220 221 222 223 224 225 226 227 228 229 230 231 232 233
}

void BackgroundWidget::paintEvent( QPaintEvent *e )
{
    int i_maxwidth, i_maxheight;
    QPixmap pixmap = QPixmap( pixmapUrl );
    QPainter painter(this);
    QBitmap pMask;
    float f_alpha = 1.0;

    i_maxwidth = std::min( maximumWidth(), width() ) - MARGIN * 2;
    i_maxheight = std::min( maximumHeight(), height() ) - MARGIN * 2;

    if ( height() > MARGIN * 2 )
Ilkka Ollakka's avatar
 
Ilkka Ollakka committed
234
    {
François Cartegnie's avatar
François Cartegnie committed
235 236 237 238 239 240 241 242 243
        /* Scale down the pixmap if the widget is too small */
        if( pixmap.width() > i_maxwidth || pixmap.height() > i_maxheight )
        {
            pixmap = pixmap.scaled( i_maxwidth, i_maxheight,
                            Qt::KeepAspectRatio, Qt::SmoothTransformation );
        }
        else
        if ( b_expandPixmap &&
             pixmap.width() < width() && pixmap.height() < height() )
244
        {
François Cartegnie's avatar
François Cartegnie committed
245 246 247 248 249 250 251 252 253 254 255 256 257 258
            /* Scale up the pixmap to fill widget's size */
            f_alpha = ( (float) pixmap.height() / (float) height() );
            pixmap = pixmap.scaled(
                    width() - MARGIN * 2,
                    height() - MARGIN * 2,
                    Qt::KeepAspectRatio,
                    ( f_alpha < .2 )? /* Don't waste cpu when not visible */
                        Qt::SmoothTransformation:
                        Qt::FastTransformation
                    );
            /* Non agressive alpha compositing when sizing up */
            pMask = QBitmap( pixmap.width(), pixmap.height() );
            pMask.fill( QColor::fromRgbF( 1.0, 1.0, 1.0, f_alpha ) );
            pixmap.setMask( pMask );
259 260
        }

François Cartegnie's avatar
François Cartegnie committed
261 262 263 264
        painter.drawPixmap(
                MARGIN + ( i_maxwidth - pixmap.width() ) /2,
                MARGIN + ( i_maxheight - pixmap.height() ) /2,
                pixmap);
Ilkka Ollakka's avatar
 
Ilkka Ollakka committed
265
    }
François Cartegnie's avatar
François Cartegnie committed
266
    QWidget::paintEvent( e );
267 268
}

269 270
void BackgroundWidget::contextMenuEvent( QContextMenuEvent *event )
{
Erwan Tulou's avatar
Erwan Tulou committed
271
    QVLCMenu::PopupMenu( p_intf, true );
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
272
    event->accept();
273
}
274

Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
275
#if 0
276 277 278
#include <QPushButton>
#include <QHBoxLayout>

Clément Stenac's avatar
Clément Stenac committed
279 280 281 282
/**********************************************************************
 * Visualization selector panel
 **********************************************************************/
VisualSelector::VisualSelector( intf_thread_t *_p_i ) :
283
                                QFrame( NULL ), p_intf( _p_i )
Clément Stenac's avatar
Clément Stenac committed
284 285
{
    QHBoxLayout *layout = new QHBoxLayout( this );
286
    layout->setMargin( 0 );
Clément Stenac's avatar
Clément Stenac committed
287
    QPushButton *prevButton = new QPushButton( "Prev" );
288
    QPushButton *nextButton = new QPushButton( "Next" );
Clément Stenac's avatar
Clément Stenac committed
289 290
    layout->addWidget( prevButton );
    layout->addWidget( nextButton );
Clément Stenac's avatar
Clément Stenac committed
291

292
    layout->addStretch( 10 );
293
    layout->addWidget( new QLabel( qtr( "Current visualization" ) ) );
Clément Stenac's avatar
Clément Stenac committed
294 295 296 297 298 299 300

    current = new QLabel( qtr( "None" ) );
    layout->addWidget( current );

    BUTTONACT( prevButton, prev() );
    BUTTONACT( nextButton, next() );

Clément Stenac's avatar
Clément Stenac committed
301
    setLayout( layout );
302
    setMaximumHeight( 35 );
Clément Stenac's avatar
Clément Stenac committed
303 304 305
}

VisualSelector::~VisualSelector()
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
306
{}
Clément Stenac's avatar
Clément Stenac committed
307

Clément Stenac's avatar
Clément Stenac committed
308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326
void VisualSelector::prev()
{
    char *psz_new = aout_VisualPrev( p_intf );
    if( psz_new )
    {
        current->setText( qfu( psz_new ) );
        free( psz_new );
    }
}

void VisualSelector::next()
{
    char *psz_new = aout_VisualNext( p_intf );
    if( psz_new )
    {
        current->setText( qfu( psz_new ) );
        free( psz_new );
    }
}
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
327
#endif
Clément Stenac's avatar
Clément Stenac committed
328

329 330
SpeedLabel::SpeedLabel( intf_thread_t *_p_intf, QWidget *parent )
           : QLabel( parent ), p_intf( _p_intf )
331
{
332
    tooltipStringPattern = qtr( "Current playback speed: %1\nClick to adjust" );
333 334

    /* Create the Speed Control Widget */
335
    speedControl = new SpeedControlWidget( p_intf, this );
336 337 338 339 340 341 342
    speedControlMenu = new QMenu( this );

    QWidgetAction *widgetAction = new QWidgetAction( speedControl );
    widgetAction->setDefaultWidget( speedControl );
    speedControlMenu->addAction( widgetAction );

    /* Change the SpeedRate in the Status Bar */
343
    CONNECT( THEMIM->getIM(), rateChanged( float ), this, setRate( float ) );
344

345 346
    DCONNECT( THEMIM, inputChanged( input_thread_t * ),
              speedControl, activateOnState() );
347
    setRate( var_InheritFloat( p_intf, "rate" ) );
348
}
349

350 351
SpeedLabel::~SpeedLabel()
{
352 353
    delete speedControl;
    delete speedControlMenu;
354
}
355

356 357 358
/****************************************************************************
 * Small right-click menu for rate control
 ****************************************************************************/
359

360 361 362 363 364 365
void SpeedLabel::showSpeedMenu( QPoint pos )
{
    speedControlMenu->exec( QCursor::pos() - pos
                          + QPoint( 0, height() ) );
}

366
void SpeedLabel::setRate( float rate )
367 368
{
    QString str;
369
    str.setNum( rate, 'f', 2 );
370 371
    str.append( "x" );
    setText( str );
372
    setToolTip( tooltipStringPattern.arg( str ) );
373 374 375
    speedControl->updateControls( rate );
}

376 377 378
/**********************************************************************
 * Speed control widget
 **********************************************************************/
379 380
SpeedControlWidget::SpeedControlWidget( intf_thread_t *_p_i, QWidget *_parent )
                    : QFrame( _parent ), p_intf( _p_i )
381
{
382
    QSizePolicy sizePolicy( QSizePolicy::Maximum, QSizePolicy::Fixed );
383 384
    sizePolicy.setHorizontalStretch( 0 );
    sizePolicy.setVerticalStretch( 0 );
385

Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
386
    speedSlider = new QSlider( this );
387 388 389 390 391
    speedSlider->setSizePolicy( sizePolicy );
    speedSlider->setMaximumSize( QSize( 80, 200 ) );
    speedSlider->setOrientation( Qt::Vertical );
    speedSlider->setTickPosition( QSlider::TicksRight );

392
    speedSlider->setRange( -34, 34 );
393 394
    speedSlider->setSingleStep( 1 );
    speedSlider->setPageStep( 1 );
395
    speedSlider->setTickInterval( 17 );
396

397
    CONNECT( speedSlider, valueChanged( int ), this, updateRate( int ) );
398

399
    QToolButton *normalSpeedButton = new QToolButton( this );
400
    normalSpeedButton->setMaximumSize( QSize( 26, 20 ) );
401
    normalSpeedButton->setAutoRaise( true );
402
    normalSpeedButton->setText( "1x" );
403
    normalSpeedButton->setToolTip( qtr( "Revert to normal play speed" ) );
404

405
    CONNECT( normalSpeedButton, clicked(), this, resetRate() );
406

Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
407
    QVBoxLayout *speedControlLayout = new QVBoxLayout( this );
408
    speedControlLayout->setContentsMargins( 4, 4, 4, 4 );
409
    speedControlLayout->setSpacing( 4 );
410 411
    speedControlLayout->addWidget( speedSlider );
    speedControlLayout->addWidget( normalSpeedButton );
412

413 414
    lastValue = 0;

415 416
    activateOnState();
}
417

418
void SpeedControlWidget::activateOnState()
419
{
420
    speedSlider->setEnabled( THEMIM->getIM()->hasInput() );
421 422
}

423
void SpeedControlWidget::updateControls( float rate )
424
{
425 426 427 428 429
    if( speedSlider->isSliderDown() )
    {
        //We don't want to change anything if the user is using the slider
        return;
    }
430

431
    double value = 17 * log( rate ) / log( 2. );
432
    int sliderValue = (int) ( ( value > 0 ) ? value + .5 : value - .5 );
433

434
    if( sliderValue < speedSlider->minimum() )
435
    {
436
        sliderValue = speedSlider->minimum();
437
    }
438
    else if( sliderValue > speedSlider->maximum() )
439
    {
440
        sliderValue = speedSlider->maximum();
441
    }
442
    lastValue = sliderValue;
443

444
    speedSlider->setValue( sliderValue );
445 446 447 448
}

void SpeedControlWidget::updateRate( int sliderValue )
{
449 450 451
    if( sliderValue == lastValue )
        return;

452
    double speed = pow( 2, (double)sliderValue / 17 );
453
    int rate = INPUT_RATE_DEFAULT / speed;
454

455
    THEMIM->getIM()->setRate(rate);
456 457 458 459
}

void SpeedControlWidget::resetRate()
{
460
    THEMIM->getIM()->setRate( INPUT_RATE_DEFAULT );
461
}
462

463
CoverArtLabel::CoverArtLabel( QWidget *parent, intf_thread_t *_p_i )
464
              : QLabel( parent ), p_intf( _p_i )
465 466
{
    setContextMenuPolicy( Qt::ActionsContextMenu );
467
    CONNECT( this, updateRequested(), this, askForUpdate() );
468

469
    setMinimumHeight( 128 );
470 471
    setMinimumWidth( 128 );
    setMaximumHeight( 128 );
472
    setMaximumWidth( 128 );
473 474
    setScaledContents( false );
    setAlignment( Qt::AlignCenter );
475

476 477
    QList< QAction* > artActions = actions();
    QAction *action = new QAction( qtr( "Download cover art" ), this );
478
    CONNECT( action, triggered(), this, askForUpdate() );
479
    addAction( action );
480

481
    showArtUpdate( "" );
482 483
}

484 485 486 487 488 489 490
CoverArtLabel::~CoverArtLabel()
{
    QList< QAction* > artActions = actions();
    foreach( QAction *act, artActions )
        removeAction( act );
}

491
void CoverArtLabel::showArtUpdate( const QString& url )
492
{
493
    QPixmap pix;
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
494
    if( !url.isEmpty() && pix.load( url ) )
495
    {
496
        pix = pix.scaled( maximumWidth(), maximumHeight(),
497 498
                          Qt::KeepAspectRatioByExpanding,
                          Qt::SmoothTransformation );
499 500 501
    }
    else
    {
502
        pix = QPixmap( ":/noart.png" );
503
    }
504
    setPixmap( pix );
505 506
}

507
void CoverArtLabel::askForUpdate()
508
{
509
    THEMIM->getIM()->requestArtUpdate();
510 511
}

512 513 514
TimeLabel::TimeLabel( intf_thread_t *_p_intf  )
    : QLabel(), p_intf( _p_intf ), bufTimer( new QTimer(this) ),
      buffering( false ), showBuffering(false), bufVal( -1 )
515
{
516 517 518
    b_remainingTime = false;
    setText( " --:--/--:-- " );
    setAlignment( Qt::AlignRight | Qt::AlignVCenter );
519 520 521 522
    setToolTip( QString( "- " )
        + qtr( "Click to toggle between elapsed and remaining time" )
        + QString( "\n- " )
        + qtr( "Double click to jump to a chosen time position" ) );
523
    bufTimer->setSingleShot( true );
524

525 526 527 528 529
    CONNECT( THEMIM->getIM(), positionUpdated( float, int64_t, int ),
              this, setDisplayPosition( float, int64_t, int ) );
    CONNECT( THEMIM->getIM(), cachingChanged( float ),
              this, updateBuffering( float ) );
    CONNECT( bufTimer, timeout(), this, updateBuffering() );
530 531
}

532
void TimeLabel::setDisplayPosition( float pos, int64_t t, int length )
533
{
534 535 536
    showBuffering = false;
    bufTimer->stop();

537
    if( pos == -1.f )
538 539 540 541
    {
        setText( " --:--/--:-- " );
        return;
    }
Jean-Baptiste Kempf's avatar
Jean-Baptiste Kempf committed
542

543
    int time = t / 1000000;
544

545 546 547 548
    secstotimestr( psz_length, length );
    secstotimestr( psz_time, ( b_remainingTime && length ) ? length - time
                                                           : time );

549 550 551 552
    QString timestr = QString( " %1%2/%3 " )
            .arg( QString( (b_remainingTime && length) ? "-" : "" ) )
            .arg( QString( psz_time ) )
            .arg( QString( ( !length && time ) ? "--:--" : psz_length ) );
553

JP Dinger's avatar
JP Dinger committed
554
    setText( timestr );
555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570

    cachedLength = length;
}

void TimeLabel::setDisplayPosition( float pos )
{
    if( pos == -1.f || cachedLength == 0 )
    {
        setText( " --:--/--:-- " );
        return;
    }

    int time = pos * cachedLength;
    secstotimestr( psz_time,
                   ( b_remainingTime && cachedLength ?
                   cachedLength - time : time ) );
571 572 573 574
    QString timestr = QString( " %1%2/%3 " )
        .arg( QString( (b_remainingTime && cachedLength) ? "-" : "" ) )
        .arg( QString( psz_time ) )
        .arg( QString( ( !cachedLength && time ) ? "--:--" : psz_length ) );
575 576

    setText( timestr );
577 578
}

579

580 581 582 583
void TimeLabel::toggleTimeDisplay()
{
    b_remainingTime = !b_remainingTime;
}
584 585


586
void TimeLabel::updateBuffering( float _buffered )
587
{
588 589 590 591 592 593 594 595 596 597
    bufVal = _buffered;
    if( !buffering || bufVal == 0 )
    {
        showBuffering = false;
        buffering = true;
        bufTimer->start(200);
    }
    else if( bufVal == 1 )
    {
        showBuffering = buffering = false;
598
        bufTimer->stop();
599 600
    }
    update();
601
}
602

603
void TimeLabel::updateBuffering()
604
{
605 606
    showBuffering = true;
    update();
607 608
}

609
void TimeLabel::paintEvent( QPaintEvent* event )
610
{
611 612 613 614 615 616 617 618
    if( showBuffering )
    {
        QRect r( rect() );
        r.setLeft( r.width() * bufVal );
        QPainter p( this );
        p.setOpacity( 0.4 );
        p.fillRect( r, palette().color( QPalette::Highlight ) );
    }
619 620
    QLabel::paintEvent( event );
}