interface_widgets.cpp 23.6 KB
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/*****************************************************************************
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 * interface_widgets.cpp : Custom widgets for the main interface
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 ****************************************************************************
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 * Copyright (C) 2006-2010 the VideoLAN team
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 * $Id$
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 *
 * Authors: Clément Stenac <zorglub@videolan.org>
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 *          Jean-Baptiste Kempf <jb@videolan.org>
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 *          Rafaël Carré <funman@videolanorg>
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 *          Ilkka Ollakka <ileoo@videolan.org>
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 *
 * 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
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 * ( at your option ) any later version.
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 *
 * 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.
 *****************************************************************************/
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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#include "qt4.hpp"
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#include "components/interface_widgets.hpp"
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#include "dialogs_provider.hpp"
#include "util/customwidgets.hpp"               // qtEventToVLCKey, QVLCStackedWidget
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#include "menus.hpp"             /* Popup menu on bgWidget */

#include <vlc_vout.h>
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#include <QLabel>
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#include <QToolButton>
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#include <QPalette>
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#include <QEvent>
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#include <QResizeEvent>
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#include <QDate>
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#include <QMenu>
#include <QWidgetAction>
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#include <QDesktopWidget>
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#include <QPainter>
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#include <QTimer>
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#include <QSlider>
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#include <QBitmap>
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#include <QUrl>
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#ifdef Q_WS_X11
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#   include <X11/Xlib.h>
#   include <qx11info_x11.h>
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#endif
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#include <math.h>
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#include <assert.h>
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/**********************************************************************
 * Video Widget. A simple frame on which video is drawn
 * This class handles resize issues
 **********************************************************************/
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VideoWidget::VideoWidget( intf_thread_t *_p_i )
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            : QFrame( NULL ) , p_intf( _p_i )
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{
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    /* Set the policy to expand in both directions */
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    // setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
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    layout = new QHBoxLayout( this );
    layout->setContentsMargins( 0, 0, 0, 0 );
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    stable = NULL;
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    show();
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}

VideoWidget::~VideoWidget()
{
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    /* Ensure we are not leaking the video output. This would crash. */
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    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
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}

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/**
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 * Request the video to avoid the conflicts
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 **/
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WId VideoWidget::request( int *pi_x, int *pi_y,
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                          unsigned int *pi_width, unsigned int *pi_height,
                          bool b_keep_size )
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{
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    msg_Dbg( p_intf, "Video was requested %i, %i", *pi_x, *pi_y );
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    if( stable )
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    {
        msg_Dbg( p_intf, "embedded video already in use" );
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        return 0;
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    }
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    if( b_keep_size )
    {
        *pi_width  = size().width();
        *pi_height = size().height();
    }

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    /* 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. */
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    stable = new QWidget();
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    QPalette plt = palette();
    plt.setColor( QPalette::Window, Qt::black );
    stable->setPalette( plt );
    stable->setAutoFillBackground(true);
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    /* Force the widget to be native so that it gets a winId() */
    stable->setAttribute( Qt::WA_NativeWindow, true );
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    /* Indicates that the widget wants to draw directly onto the screen.
       Widgets with this attribute set do not participate in composition
       management */
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    /* This is currently disabled on X11 as it does not seem to improve
     * performance, but causes the video widget to be transparent... */
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#if !defined (Q_WS_X11) && !defined (Q_WS_QPA)
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    stable->setAttribute( Qt::WA_PaintOnScreen, true );
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#endif
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    layout->addWidget( stable );
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#ifdef Q_WS_X11
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    /* HACK: Only one X11 client can subscribe to mouse button press events.
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     * VLC currently handles those in the video display.
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     * Force Qt4 to unsubscribe from mouse press and release events. */
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    Display *dpy = QX11Info::display();
    Window w = stable->winId();
    XWindowAttributes attr;

    XGetWindowAttributes( dpy, w, &attr );
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    attr.your_event_mask &= ~(ButtonPressMask|ButtonReleaseMask);
    XSelectInput( dpy, w, attr.your_event_mask );
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#endif
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    sync();
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    return stable->winId();
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}

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/* Set the Widget to the correct Size */
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/* Function has to be called by the parent
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   Parent has to care about resizing itself */
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void VideoWidget::SetSizing( unsigned int w, unsigned int h )
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{
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    resize( w, h );
    emit sizeChanged( w, h );
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    /* 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
     */
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    if( (unsigned)size().width() == w && (unsigned)size().height() == h )
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        updateGeometry();
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    sync();
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}

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void VideoWidget::release( void )
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{
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    msg_Dbg( p_intf, "Video is not needed anymore" );
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    if( stable )
    {
        layout->removeWidget( stable );
        stable->deleteLater();
        stable = NULL;
    }
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    updateGeometry();
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}
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/**********************************************************************
 * Background Widget. Show a simple image background. Currently,
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 * it's album art if present or cone.
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 **********************************************************************/
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BackgroundWidget::BackgroundWidget( intf_thread_t *_p_i )
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    :QWidget( NULL ), p_intf( _p_i ), b_expandPixmap( false ), b_withart( true )
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{
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    /* A dark background */
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    setAutoFillBackground( true );
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    QPalette plt = palette();
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    plt.setColor( QPalette::Active, QPalette::Window , Qt::black );
    plt.setColor( QPalette::Inactive, QPalette::Window , Qt::black );
    setPalette( plt );

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    /* Init the cone art */
    updateArt( "" );

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    /* fade in animator */
    setProperty( "opacity", 1.0 );
    fadeAnimation = new QPropertyAnimation( this, "opacity", this );
    fadeAnimation->setDuration( 1000 );
    fadeAnimation->setStartValue( 0.0 );
    fadeAnimation->setEndValue( 1.0 );
    fadeAnimation->setEasingCurve( QEasingCurve::OutSine );
    CONNECT( fadeAnimation, valueChanged( const QVariant & ),
             this, update() );

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

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void BackgroundWidget::updateArt( const QString& url )
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{
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    if ( !url.isEmpty() )
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    {
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        pixmapUrl = url;
    }
    else
    {   /* Xmas joke */
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        if( QDate::currentDate().dayOfYear() >= QT_XMAS_JOKE_DAY && var_InheritBool( p_intf, "qt-icon-change" ) )
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            pixmapUrl = QString( ":/logo/vlc128-xmas.png" );
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        else
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            pixmapUrl = QString( ":/logo/vlc128.png" );
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    }
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    update();
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}

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void BackgroundWidget::showEvent( QShowEvent * e )
{
    Q_UNUSED( e );
    if ( b_withart ) fadeAnimation->start();
}

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void BackgroundWidget::paintEvent( QPaintEvent *e )
{
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    if ( !b_withart )
    {
        /* we just want background autofill */
        QWidget::paintEvent( e );
        return;
    }

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    int i_maxwidth, i_maxheight;
    QPixmap pixmap = QPixmap( pixmapUrl );
    QPainter painter(this);
    QBitmap pMask;
    float f_alpha = 1.0;

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    i_maxwidth  = __MIN( maximumWidth(), width() ) - MARGIN * 2;
    i_maxheight = __MIN( maximumHeight(), height() ) - MARGIN * 2;
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    painter.setOpacity( property( "opacity" ).toFloat() );

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    if ( height() > MARGIN * 2 )
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    {
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        /* 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() )
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        {
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            /* 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 );
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        }

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        painter.drawPixmap(
                MARGIN + ( i_maxwidth - pixmap.width() ) /2,
                MARGIN + ( i_maxheight - pixmap.height() ) /2,
                pixmap);
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    }
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    QWidget::paintEvent( e );
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}

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void BackgroundWidget::contextMenuEvent( QContextMenuEvent *event )
{
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    VLCMenuBar::PopupMenu( p_intf, true );
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    event->accept();
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}
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#if 0
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#include <QPushButton>
#include <QHBoxLayout>

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/**********************************************************************
 * Visualization selector panel
 **********************************************************************/
VisualSelector::VisualSelector( intf_thread_t *_p_i ) :
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                                QFrame( NULL ), p_intf( _p_i )
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{
    QHBoxLayout *layout = new QHBoxLayout( this );
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    layout->setMargin( 0 );
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    QPushButton *prevButton = new QPushButton( "Prev" );
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    QPushButton *nextButton = new QPushButton( "Next" );
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    layout->addWidget( prevButton );
    layout->addWidget( nextButton );
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    layout->addStretch( 10 );
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    layout->addWidget( new QLabel( qtr( "Current visualization" ) ) );
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    current = new QLabel( qtr( "None" ) );
    layout->addWidget( current );

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

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    setLayout( layout );
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    setMaximumHeight( 35 );
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}

VisualSelector::~VisualSelector()
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{}
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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 );
    }
}
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#endif
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SpeedLabel::SpeedLabel( intf_thread_t *_p_intf, QWidget *parent )
           : QLabel( parent ), p_intf( _p_intf )
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{
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    tooltipStringPattern = qtr( "Current playback speed: %1\nClick to adjust" );
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    /* Create the Speed Control Widget */
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    speedControl = new SpeedControlWidget( p_intf, this );
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    speedControlMenu = new QMenu( this );

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

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    /* Change the SpeedRate in the Label */
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    CONNECT( THEMIM->getIM(), rateChanged( float ), this, setRate( float ) );
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    DCONNECT( THEMIM, inputChanged( input_thread_t * ),
              speedControl, activateOnState() );
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    setFrameStyle( QFrame::StyledPanel | QFrame::Raised );
    setLineWidth( 1 );

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    setRate( var_InheritFloat( THEPL, "rate" ) );
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}
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SpeedLabel::~SpeedLabel()
{
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    delete speedControl;
    delete speedControlMenu;
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}
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/****************************************************************************
 * Small right-click menu for rate control
 ****************************************************************************/
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void SpeedLabel::showSpeedMenu( QPoint pos )
{
    speedControlMenu->exec( QCursor::pos() - pos
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                            + QPoint( -70 + width()/2, height() ) );
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}

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void SpeedLabel::setRate( float rate )
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{
    QString str;
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    str.setNum( rate, 'f', 2 );
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    str.append( "x" );
    setText( str );
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    setToolTip( tooltipStringPattern.arg( str ) );
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    speedControl->updateControls( rate );
}

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/**********************************************************************
 * Speed control widget
 **********************************************************************/
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SpeedControlWidget::SpeedControlWidget( intf_thread_t *_p_i, QWidget *_parent )
                    : QFrame( _parent ), p_intf( _p_i )
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{
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    QSizePolicy sizePolicy( QSizePolicy::Fixed, QSizePolicy::Maximum );
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    sizePolicy.setHorizontalStretch( 0 );
    sizePolicy.setVerticalStretch( 0 );
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    speedSlider = new QSlider( this );
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    speedSlider->setSizePolicy( sizePolicy );
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    speedSlider->setMinimumSize( QSize( 140, 20 ) );
    speedSlider->setOrientation( Qt::Horizontal );
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    speedSlider->setTickPosition( QSlider::TicksBelow );
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    speedSlider->setRange( -34, 34 );
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    speedSlider->setSingleStep( 1 );
    speedSlider->setPageStep( 1 );
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    speedSlider->setTickInterval( 17 );
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    CONNECT( speedSlider, valueChanged( int ), this, updateRate( int ) );
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    QToolButton *normalSpeedButton = new QToolButton( this );
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    normalSpeedButton->setMaximumSize( QSize( 26, 16 ) );
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    normalSpeedButton->setAutoRaise( true );
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    normalSpeedButton->setText( "1x" );
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    normalSpeedButton->setToolTip( qtr( "Revert to normal play speed" ) );
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    CONNECT( normalSpeedButton, clicked(), this, resetRate() );
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    QToolButton *slowerButton = new QToolButton( this );
    slowerButton->setMaximumSize( QSize( 26, 16 ) );
    slowerButton->setAutoRaise( true );
    slowerButton->setToolTip( tooltipL[SLOWER_BUTTON] );
    slowerButton->setIcon( QIcon( iconL[SLOWER_BUTTON] ) );
    CONNECT( slowerButton, clicked(), THEMIM->getIM(), slower() );

    QToolButton *fasterButton = new QToolButton( this );
    fasterButton->setMaximumSize( QSize( 26, 16 ) );
    fasterButton->setAutoRaise( true );
    fasterButton->setToolTip( tooltipL[FASTER_BUTTON] );
    fasterButton->setIcon( QIcon( iconL[FASTER_BUTTON] ) );
    CONNECT( fasterButton, clicked(), THEMIM->getIM(), faster() );

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/*    spinBox = new QDoubleSpinBox();
    spinBox->setDecimals( 2 );
    spinBox->setMaximum( 32 );
    spinBox->setMinimum( 0.03F );
    spinBox->setSingleStep( 0.10F );
    spinBox->setAlignment( Qt::AlignRight );

    CONNECT( spinBox, valueChanged( double ), this, updateSpinBoxRate( double ) ); */

    QGridLayout* speedControlLayout = new QGridLayout( this );
    speedControlLayout->addWidget( speedSlider, 0, 0, 1, 3 );
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    speedControlLayout->addWidget( slowerButton, 1, 0 );
    speedControlLayout->addWidget( normalSpeedButton, 1, 1, 1, 1, Qt::AlignRight );
    speedControlLayout->addWidget( fasterButton, 1, 2, 1, 1, Qt::AlignRight );
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    //speedControlLayout->addWidget( spinBox );
    speedControlLayout->setContentsMargins( 0, 0, 0, 0 );
    speedControlLayout->setSpacing( 0 );
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    lastValue = 0;

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    activateOnState();
}
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void SpeedControlWidget::activateOnState()
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{
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    speedSlider->setEnabled( THEMIM->getIM()->hasInput() );
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    //spinBox->setEnabled( THEMIM->getIM()->hasInput() );
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}

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void SpeedControlWidget::updateControls( float rate )
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{
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    if( speedSlider->isSliderDown() )
    {
        //We don't want to change anything if the user is using the slider
        return;
    }
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    double value = 17 * log( rate ) / log( 2. );
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    int sliderValue = (int) ( ( value > 0 ) ? value + .5 : value - .5 );
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    if( sliderValue < speedSlider->minimum() )
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    {
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        sliderValue = speedSlider->minimum();
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    }
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    else if( sliderValue > speedSlider->maximum() )
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    {
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        sliderValue = speedSlider->maximum();
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    }
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    lastValue = sliderValue;
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    speedSlider->setValue( sliderValue );
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    //spinBox->setValue( rate );
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}

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

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    double speed = pow( 2, (double)sliderValue / 17 );
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    int rate = INPUT_RATE_DEFAULT / speed;
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    THEMIM->getIM()->setRate(rate);
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    //spinBox->setValue( var_InheritFloat( THEPL, "rate" ) );
}

void SpeedControlWidget::updateSpinBoxRate( double r )
{
    var_SetFloat( THEPL, "rate", r );
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}

void SpeedControlWidget::resetRate()
{
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    THEMIM->getIM()->setRate( INPUT_RATE_DEFAULT );
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}
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CoverArtLabel::CoverArtLabel( QWidget *parent, intf_thread_t *_p_i )
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    : QLabel( parent ), p_intf( _p_i ), p_item( NULL )
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{
    setContextMenuPolicy( Qt::ActionsContextMenu );
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    CONNECT( THEMIM->getIM(), artChanged( input_item_t * ),
             this, showArtUpdate( input_item_t * ) );
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    setMinimumHeight( 128 );
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    setMinimumWidth( 128 );
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    setScaledContents( false );
    setAlignment( Qt::AlignCenter );
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    QAction *action = new QAction( qtr( "Download cover art" ), this );
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    CONNECT( action, triggered(), this, askForUpdate() );
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    addAction( action );
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    action = new QAction( qtr( "Add cover art from file" ), this );
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    CONNECT( action, triggered(), this, setArtFromFile() );
    addAction( action );

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    p_item = THEMIM->currentInputItem();
    if( p_item )
        showArtUpdate( p_item );
    else
        showArtUpdate( "" );
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}

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CoverArtLabel::~CoverArtLabel()
{
    QList< QAction* > artActions = actions();
    foreach( QAction *act, artActions )
        removeAction( act );
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    if ( p_item ) vlc_gc_decref( p_item );
}

void CoverArtLabel::setItem( input_item_t *_p_item )
{
    if ( p_item ) vlc_gc_decref( p_item );
    p_item = _p_item;
    if ( p_item ) vlc_gc_incref( p_item );
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}

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void CoverArtLabel::showArtUpdate( const QString& url )
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{
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    QPixmap pix;
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    if( !url.isEmpty() && pix.load( url ) )
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    {
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        pix = pix.scaled( minimumWidth(), minimumHeight(),
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                          Qt::KeepAspectRatioByExpanding,
                          Qt::SmoothTransformation );
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    }
    else
    {
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        pix = QPixmap( ":/noart.png" );
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    }
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    setPixmap( pix );
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}

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void CoverArtLabel::showArtUpdate( input_item_t *_p_item )
{
    /* not for me */
    if ( _p_item != p_item )
        return;

    QString url;
    if ( _p_item ) url = THEMIM->getIM()->decodeArtURL( _p_item );
    showArtUpdate( url );
}

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void CoverArtLabel::askForUpdate()
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{
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    THEMIM->getIM()->requestArtUpdate( p_item );
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}

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void CoverArtLabel::setArtFromFile()
{
    if( !p_item )
        return;

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    QString filePath = QFileDialog::getOpenFileName( this, qtr( "Choose Cover Art" ),
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        p_intf->p_sys->filepath, qtr( "Image Files (*.gif *.jpg *.jpeg *.png)" ) );

    if( filePath.isEmpty() )
        return;

    QString fileUrl = QUrl::fromLocalFile( filePath ).toString();

    THEMIM->getIM()->setArt( p_item, fileUrl );
}

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TimeLabel::TimeLabel( intf_thread_t *_p_intf, TimeLabel::Display _displayType  )
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    : ClickableQLabel(), p_intf( _p_intf ), bufTimer( new QTimer(this) ),
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      buffering( false ), showBuffering(false), bufVal( -1 ), displayType( _displayType )
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{
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    b_remainingTime = false;
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    if( _displayType != TimeLabel::Elapsed )
        b_remainingTime = getSettings()->value( "MainWindow/ShowRemainingTime", false ).toBool();
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    switch( _displayType ) {
        case TimeLabel::Elapsed:
            setText( " --:-- " );
            setToolTip( qtr("Elapsed time") );
            break;
        case TimeLabel::Remaining:
            setText( " --:-- " );
            setToolTip( qtr("Total/Remaining time")
                        + QString("\n-")
                        + qtr("Click to toggle between total and remaining time")
                      );
            break;
        case TimeLabel::Both:
            setText( " --:--/--:-- " );
            setToolTip( QString( "- " )
                + qtr( "Click to toggle between elapsed and remaining time" )
                + QString( "\n- " )
                + qtr( "Double click to jump to a chosen time position" ) );
            break;
    }
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    setAlignment( Qt::AlignRight | Qt::AlignVCenter );
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    bufTimer->setSingleShot( true );
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    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() );
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    setStyleSheet( "padding-left: 4px; padding-right: 4px;" );
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}

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

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    if( pos == -1.f )
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    {
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        setMinimumSize( QSize( 0, 0 ) );
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        if( displayType == TimeLabel::Both )
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            setText( "--:--/--:--" );
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        else
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            setText( "--:--" );
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        return;
    }
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    int time = t / 1000000;
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    secstotimestr( psz_length, length );
    secstotimestr( psz_time, ( b_remainingTime && length ) ? length - time
                                                           : time );
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    // compute the minimum size that will be required for the psz_length
    // and use it to enforce a minimal size to avoid "dancing" widgets
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    QSize minsize( 0, 0 );
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    if ( length > 0 )
    {
        QMargins margins = contentsMargins();
        minsize += QSize(
                  fontMetrics().size( 0, QString( psz_length ), 0, 0 ).width(),
                  sizeHint().height()
                );
        minsize += QSize( margins.left() + margins.right() + 8, 0 ); /* +padding */

        if ( b_remainingTime )
            minsize += QSize( fontMetrics().size( 0, "-", 0, 0 ).width(), 0 );
    }

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    switch( displayType )
    {
        case TimeLabel::Elapsed:
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            setMinimumSize( minsize );
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            setText( QString( psz_time ) );
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            break;
        case TimeLabel::Remaining:
            if( b_remainingTime )
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            {
                setMinimumSize( minsize );
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                setText( QString("-") + QString( psz_time ) );
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            }
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            else
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            {
                setMinimumSize( QSize( 0, 0 ) );
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                setText( QString( psz_length ) );
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            }
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            break;
        case TimeLabel::Both:
        default:
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            QString timestr = QString( "%1%2/%3" )
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            .arg( QString( (b_remainingTime && length) ? "-" : "" ) )
            .arg( QString( psz_time ) )
            .arg( QString( ( !length && time ) ? "--:--" : psz_length ) );
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            setText( timestr );
            break;
    }
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    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 ) );
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    QString timestr = QString( "%1%2/%3" )
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        .arg( QString( (b_remainingTime && cachedLength) ? "-" : "" ) )
        .arg( QString( psz_time ) )
        .arg( QString( ( !cachedLength && time ) ? "--:--" : psz_length ) );
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    setText( timestr );
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}

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void TimeLabel::toggleTimeDisplay()
{
    b_remainingTime = !b_remainingTime;
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    getSettings()->setValue( "MainWindow/ShowRemainingTime", b_remainingTime );
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}
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void TimeLabel::updateBuffering( float _buffered )
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{
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    bufVal = _buffered;
    if( !buffering || bufVal == 0 )
    {
        showBuffering = false;
        buffering = true;
        bufTimer->start(200);
    }
    else if( bufVal == 1 )
    {
        showBuffering = buffering = false;
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        bufTimer->stop();
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    }
    update();
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}
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void TimeLabel::updateBuffering()
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{
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    showBuffering = true;
    update();
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}

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void TimeLabel::paintEvent( QPaintEvent* event )
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{
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    if( showBuffering )
    {
        QRect r( rect() );
        r.setLeft( r.width() * bufVal );
        QPainter p( this );
        p.setOpacity( 0.4 );
        p.fillRect( r, palette().color( QPalette::Highlight ) );
    }
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    QLabel::paintEvent( event );
}