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[vlc] / modules / gui / qt4 / main_interface.cpp
index ae40ad36b2d7b156e6cd080c934e06b424b99de4..ac792669d6a2ff92a163aaac67435d2f34bbe4a7 100644 (file)
@@ -1,8 +1,8 @@
 /*****************************************************************************
  * main_inteface.cpp : Main interface
  ****************************************************************************
- * Copyright (C) 2000-2005 the VideoLAN team
- * $Id: wxwidgets.cpp 15731 2006-05-25 14:43:53Z zorglub $
+ * Copyright (C) 2006 the VideoLAN team
+ * $Id$
  *
  * Authors: ClĂ©ment Stenac <zorglub@videolan.org>
  *
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/
 
+#include "qt4.hpp"
 #include "main_interface.hpp"
 #include "input_manager.hpp"
+#include "util/input_slider.hpp"
+#include "util/qvlcframe.hpp"
 #include "dialogs_provider.hpp"
+#include "components/interface_widgets.hpp"
+#include "dialogs/playlist.hpp"
+#include "menus.hpp"
 
-MainInterface::MainInterface( intf_thread_t *p_intf ) : QWidget( NULL )
+#include <QMenuBar>
+#include <QCloseEvent>
+#include <QPushButton>
+#include <QStatusBar>
+#include <QKeyEvent>
+
+#include <assert.h>
+#include <vlc_keys.h>
+#include <vlc/vout.h>
+#include <aout_internal.h>
+
+#ifdef WIN32
+    #define PREF_W 410
+    #define PREF_H 121
+#else
+    #define PREF_W 450
+    #define PREF_H 125
+#endif
+
+#define VISIBLE(i) (i && i->isVisible())
+
+#define SET_WIDTH(i,j) i->widgetSize.setWidth(j)
+#define SET_HEIGHT(i,j) i->widgetSize.setHeight(j)
+#define SET_WH( i,j,k) i->widgetSize.setWidth(j); i->widgetSize.setHeight(k);
+
+#define DS(i) i.width(),i.height()
+
+static int InteractCallback( vlc_object_t *, const char *, vlc_value_t,
+                             vlc_value_t, void *);
+/* Video handling */
+static void *DoRequest( intf_thread_t *p_intf, vout_thread_t *p_vout,
+                        int *pi1, int *pi2, unsigned int*pi3,unsigned int*pi4)
+{
+    return p_intf->p_sys->p_mi->requestVideo( p_vout, pi1, pi2, pi3, pi4 );
+}
+static void DoRelease( intf_thread_t *p_intf, void *p_win )
 {
-    fprintf( stderr, "QT Main interface\n" );
+    return p_intf->p_sys->p_mi->releaseVideo( p_win );
+}
+static int DoControl( intf_thread_t *p_intf, void *p_win, int i_q, va_list a )
+{
+    return p_intf->p_sys->p_mi->controlVideo( p_win, i_q, a );
+}
+
+bool embeddedPlaylistWasActive;
+bool videoIsActive;
+QSize savedVideoSize;
+
+MainInterface::MainInterface( intf_thread_t *_p_intf ) : QVLCMW( _p_intf )
+{
+    settings = new QSettings( "VideoLAN", "VLC" );
+    settings->beginGroup( "MainWindow" );
+
+    need_components_update = false;
+    bgWidget = NULL; videoWidget = NULL; playlistWidget = NULL;
+    embeddedPlaylistWasActive = videoIsActive = false;
 
-    /* Init UI */
+    /* Fetch configuration from settings and vlc config */
+    videoEmbeddedFlag = false;
+    if( config_GetInt( p_intf, "embedded-video" ) )
+        videoEmbeddedFlag = true;
+
+    alwaysVideoFlag = false;
+    if( videoEmbeddedFlag && config_GetInt( p_intf, "qt-always-video" ))
+        alwaysVideoFlag = true;
+
+    playlistEmbeddedFlag = settings->value( "playlist-embedded", true ).
+                                                                    toBool();
+    advControlsEnabled= settings->value( "adv-controls", false ).toBool();
+
+    setWindowTitle( QString::fromUtf8( _("VLC media player") ) );
+    handleMainUi( settings );
+
+    QVLCMenu::createMenuBar( this, p_intf, playlistEmbeddedFlag,
+                             advControlsEnabled );
+
+    /* Status bar */
+    timeLabel = new QLabel( 0 );
+    nameLabel = new QLabel( 0 );
+    statusBar()->addWidget( nameLabel, 4 );
+    statusBar()->addPermanentWidget( timeLabel, 1 );
+
+    setFocusPolicy( Qt::StrongFocus );
 
     /* Init input manager */
+    MainInputManager::getInstance( p_intf );
+    ON_TIMEOUT( updateOnTimer() );
+
+    /* Volume control */
+    CONNECT( ui.volumeSlider, valueChanged(int), this, updateVolume(int) );
+    /* Connect the input manager to the GUI elements it manages */
+    CONNECT( THEMIM->getIM(), positionUpdated( float, int, int ),
+             slider, setPosition( float,int, int ) );
+    CONNECT( THEMIM->getIM(), positionUpdated( float, int, int ),
+             this, setDisplay( float, int, int ) );
+    CONNECT( THEMIM->getIM(), nameChanged( QString ), this,setName( QString ) );
+    CONNECT( THEMIM->getIM(), statusChanged( int ), this, setStatus( int ) );
+    CONNECT( slider, sliderDragged( float ),
+             THEMIM->getIM(), sliderUpdate( float ) );
+
+    var_Create( p_intf, "interaction", VLC_VAR_ADDRESS );
+    var_AddCallback( p_intf, "interaction", InteractCallback, this );
+    p_intf->b_interaction = VLC_TRUE;
 }
 
-void MainInterface::init()
+MainInterface::~MainInterface()
 {
-    /* Get timer updates */
-    QObject::connect( DialogsProvider::getInstance(NULL)->fixed_timer,
-                     SIGNAL( timeout() ), this, SLOT(updateOnTimer() ) );
-    /* Tell input manager about the input changes */
-    QObject::connect( this, SIGNAL( inputChanged( input_thread_t * ) ),
-                  main_input_manager, SLOT( setInput( input_thread_t * ) ) );
+    settings->setValue( "playlist-embedded", playlistEmbeddedFlag );
+    settings->setValue( "adv-controls", advControlsEnabled );
+    settings->setValue( "pos", pos() );
+    settings->endGroup();
+    delete settings;
+    p_intf->b_interaction = VLC_FALSE;
+    var_DelCallback( p_intf, "interaction", InteractCallback, this );
+
+    p_intf->pf_request_window = NULL;
+    p_intf->pf_release_window = NULL;
+    p_intf->pf_control_window = NULL;
 }
 
-MainInterface::~MainInterface()
+void MainInterface::handleMainUi( QSettings *settings )
 {
+    QWidget *main = new QWidget( this );
+    setCentralWidget( main );
+    ui.setupUi( centralWidget() );
+
+    slider = new InputSlider( Qt::Horizontal, NULL );
+    ui.hboxLayout->insertWidget( 0, slider );
+
+    BUTTON_SET_ACT_I( ui.prevButton, "" , previous.png,
+                      qtr("Previous"), prev() );
+    BUTTON_SET_ACT_I( ui.nextButton, "", next.png, qtr("Next"), next() );
+    BUTTON_SET_ACT_I( ui.playButton, "", play.png, qtr("Play"), play() );
+    BUTTON_SET_ACT_I( ui.stopButton, "", stop.png, qtr("Stop"), stop() );
+    BUTTON_SET_ACT_I( ui.visualButton, "", stop.png,
+                    qtr( "Audio visualizations" ), visual() );
+
+    /* Volume */
+    ui.volMuteLabel->setPixmap( QPixmap( ":/pixmaps/volume-low.png" ) );
+    ui.volumeSlider->setMaximum( 100 );
+    ui.volMuteLabel->setToolTip( qtr( "Mute" ) );
+    VolumeClickHandler *h = new VolumeClickHandler( p_intf, this );
+    ui.volMuteLabel->installEventFilter(h);
+    ui.volumeSlider->setFocusPolicy( Qt::NoFocus );
+
+    BUTTON_SET_IMG( ui.playlistButton, "" ,volume-low.png,
+                        playlistEmbeddedFlag ?  qtr( "Show playlist" ) :
+                                                qtr( "Open playlist" ) );
+    BUTTONACT( ui.playlistButton, playlist() );
+
+    /* Set initial size */
+    resize ( PREF_W, PREF_H );
+
+    addSize = QSize( ui.vboxLayout->margin() * 2, PREF_H );
+
+    advControls = new ControlsWidget( p_intf );
+    ui.vboxLayout->insertWidget( 0, advControls );
+    advControls->updateGeometry();
+    if( !advControlsEnabled ) advControls->hide();
+    need_components_update = true;
+
+    visualSelector = new VisualSelector( p_intf );
+    ui.vboxLayout->insertWidget( 0, visualSelector );
+    visualSelector->hide();
+
+    if( alwaysVideoFlag )
+    {
+        bgWidget = new BackgroundWidget( p_intf );
+        bgWidget->widgetSize = settings->value( "backgroundSize",
+                                                QSize( 200, 200 ) ).toSize();
+        bgWidget->resize( bgWidget->widgetSize );
+        bgWidget->updateGeometry();
+        ui.vboxLayout->insertWidget( 0, bgWidget );
+    }
+
+    if( videoEmbeddedFlag )
+    {
+        videoWidget = new VideoWidget( p_intf );
+        videoWidget->widgetSize = QSize( 1, 1 );
+        videoWidget->resize( videoWidget->widgetSize );
+        ui.vboxLayout->insertWidget( 0, videoWidget );
+
+        p_intf->pf_request_window  = ::DoRequest;
+        p_intf->pf_release_window  = ::DoRelease;
+        p_intf->pf_control_window  = ::DoControl;
+    }
+    setMinimumSize( PREF_W, addSize.height() );
+}
+
+/**********************************************************************
+ * Handling of the components
+ **********************************************************************/
+void MainInterface::calculateInterfaceSize()
+{
+    int width = 0, height = 0;
+    if( VISIBLE( bgWidget ) )
+    {
+        width = bgWidget->widgetSize.width();
+        height = bgWidget->widgetSize.height();
+        assert( !(playlistWidget && playlistWidget->isVisible() ) );
+    }
+    else if( VISIBLE( playlistWidget ) )
+    {
+        width = playlistWidget->widgetSize.width();
+        height = playlistWidget->widgetSize.height();
+        fprintf( stderr, "Have %ix%i playlist\n", width, height );
+    }
+    else if( videoIsActive )
+    {
+        width =  videoWidget->widgetSize.width() ;
+        height = videoWidget->widgetSize.height();
+        fprintf( stderr, "Video Size %ix%i\n", DS( videoWidget->widgetSize ) );
+    }
+    else
+    {
+        width = PREF_W - addSize.width();
+        height = PREF_H - addSize.height();
+    }
+    if( VISIBLE( visualSelector ) )
+        height += visualSelector->height();
+    fprintf( stderr, "Adv %p - visible %i\n", advControls, advControls->isVisible() );
+    if( VISIBLE( advControls) )
+    {
+        fprintf( stderr, "visible\n" );
+        height += advControls->sizeHint().height();
+    }
+
+    fprintf( stderr, "Adv height %i\n", advControls->sizeHint().height() );
+    fprintf( stderr, "Setting to %ix%i\n",
+                     width + addSize.width() , height + addSize.height() );
+
+    mainSize = QSize( width + addSize.width(), height + addSize.height() );
+}
+
+void MainInterface::resizeEvent( QResizeEvent *e )
+{
+    fprintf( stderr, "Resize event to %ix%i\n", DS( e->size() ) );
+    videoWidget->widgetSize.setWidth(  e->size().width() - addSize.width() );
+    if( videoWidget && videoIsActive && videoWidget->widgetSize.height() > 1 )
+    {
+        SET_WH( videoWidget, e->size().width() - addSize.width(),
+                             e->size().height()  - addSize.height() );
+        videoWidget->updateGeometry();
+    }
+    if( VISIBLE( playlistWidget ) )
+    {
+        SET_WH( playlistWidget , e->size().width() - addSize.width(),
+                                 e->size().height() - addSize.height() );
+        playlistWidget->updateGeometry();
+    }
+}
+
+void *MainInterface::requestVideo( vout_thread_t *p_nvout, int *pi_x,
+                                   int *pi_y, unsigned int *pi_width,
+                                   unsigned int *pi_height )
+{
+    void *ret = videoWidget->request( p_nvout,pi_x, pi_y, pi_width, pi_height );
+    if( ret )
+    {
+        videoIsActive = true;
+        if( VISIBLE( playlistWidget ) )
+        {
+            embeddedPlaylistWasActive = true;
+            playlistWidget->hide();
+        }
+        bool bgWasVisible = false;
+        if( VISIBLE( bgWidget) )
+        {
+            bgWasVisible = true;
+            bgWidget->hide();
+        }
+        if( THEMIM->getIM()->hasVideo() || !bgWasVisible )
+        {
+            videoWidget->widgetSize = QSize( *pi_width, *pi_height );
+        }
+        else /* Background widget available, use its size */
+        {
+            /* Ok, our visualizations are bad, so don't do this for the moment
+             * use the requested size anyway */
+            // videoWidget->widgetSize = bgWidget->widgeTSize;
+            videoWidget->widgetSize = QSize( *pi_width, *pi_height );
+        }
+        videoWidget->updateGeometry(); /// FIXME: Needed ?
+        need_components_update = true;
+    }
+    return ret;
+}
+
+void MainInterface::releaseVideo( void *p_win )
+{
+    videoWidget->release( p_win );
+    videoWidget->widgetSize = QSize( 0, 0 );
+    videoWidget->resize( videoWidget->widgetSize );
+
+    if( embeddedPlaylistWasActive )
+        playlistWidget->show();
+    else if( bgWidget )
+        bgWidget->show();
+
+    videoIsActive = false;
+    need_components_update = true;
 }
 
+int MainInterface::controlVideo( void *p_window, int i_query, va_list args )
+{
+    int i_ret = VLC_EGENERIC;
+    switch( i_query )
+    {
+        case VOUT_GET_SIZE:
+        {
+            unsigned int *pi_width  = va_arg( args, unsigned int * );
+            unsigned int *pi_height = va_arg( args, unsigned int * );
+            *pi_width = videoWidget->widgetSize.width();
+            *pi_height = videoWidget->widgetSize.height();
+            i_ret = VLC_SUCCESS;
+            break;
+        }
+        case VOUT_SET_SIZE:
+        {
+            unsigned int i_width  = va_arg( args, unsigned int );
+            unsigned int i_height = va_arg( args, unsigned int );
+//          if( !i_width && p_vout ) i_width = p_vout->i_window_width;
+//          if( !i_height && p_vout ) i_height = p_vout->i_window_height;
+            videoWidget->widgetSize = QSize( i_width, i_height );
+            videoWidget->updateGeometry();
+            need_components_update = true;
+            i_ret = VLC_SUCCESS;
+            break;
+        }
+        case VOUT_SET_STAY_ON_TOP:
+        default:
+            msg_Warn( p_intf, "unsupported control query" );
+            break;
+    }
+    return i_ret;
+}
+
+void MainInterface::advanced()
+{
+    if( !VISIBLE( advControls ) )
+    {
+        advControls->show();
+        advControlsEnabled = true;
+    }
+    else
+    {
+        advControls->hide();
+        advControlsEnabled = false;
+    }
+    doComponentsUpdate();
+}
+
+void MainInterface::visual()
+{
+    if( !VISIBLE( visualSelector) )
+    {
+        visualSelector->show();
+        if( !THEMIM->getIM()->hasVideo() )
+        {
+            /* Show the background widget */
+        }
+    }
+    else
+    {
+        /* Stop any currently running visualization */
+        visualSelector->hide();
+    }
+    doComponentsUpdate();
+}
+
+void MainInterface::playlist()
+{
+    // Toggle the playlist dialog
+    if( !playlistEmbeddedFlag )
+    {
+        if( playlistWidget )
+        {
+            /// \todo Destroy it
+        }
+        THEDP->playlistDialog();
+        return;
+    }
+
+    if( !playlistWidget )
+    {
+        PlaylistDialog::killInstance();
+        playlistWidget = new PlaylistWidget( p_intf );
+        ui.vboxLayout->insertWidget( 0, playlistWidget );
+        playlistWidget->widgetSize = settings->value( "playlistSize",
+                                               QSize( 650, 310 ) ).toSize();
+        playlistWidget->hide();
+    }
+    /// Todo, reset its size ?
+    if( VISIBLE( playlistWidget) )
+    {
+        playlistWidget->hide();
+        if( videoIsActive )
+        {
+            videoWidget->widgetSize = savedVideoSize;
+            videoWidget->resize( videoWidget->widgetSize );
+            videoWidget->updateGeometry();
+        }
+    }
+    else
+    {
+        playlistWidget->show();
+        if( videoIsActive )
+        {
+            savedVideoSize = videoWidget->widgetSize;
+            videoWidget->widgetSize.setHeight( 0 );
+            videoWidget->resize( videoWidget->widgetSize );
+            videoWidget->updateGeometry();
+        }
+        if( VISIBLE( bgWidget ) ) bgWidget->hide();
+    }
+    doComponentsUpdate();
+}
+
+/* Video widget cannot do this synchronously as it runs in another thread */
+/* Well, could it, actually ? Probably dangerous ... */
+void MainInterface::doComponentsUpdate()
+{
+    calculateInterfaceSize();
+    resize( mainSize );
+}
+
+void MainInterface::undockPlaylist()
+{
+    if( playlistWidget )
+    {
+        playlistWidget->hide();
+        playlistWidget->deleteLater();
+        ui.vboxLayout->removeWidget( playlistWidget );
+        playlistWidget = NULL;
+        playlistEmbeddedFlag = false;
+
+        menuBar()->clear();
+        QVLCMenu::createMenuBar( this, p_intf, false, advControlsEnabled );
+
+        if( videoIsActive )
+        {
+            videoWidget->widgetSize = savedVideoSize;
+            videoWidget->resize( videoWidget->widgetSize );
+            videoWidget->updateGeometry();
+        }
+
+        doComponentsUpdate();
+        THEDP->playlistDialog();
+    }
+}
+
+void MainInterface::customEvent( QEvent *event )
+{
+    if( event->type() == PLDockEvent_Type )
+    {
+        PlaylistDialog::killInstance();
+        playlistEmbeddedFlag = true;
+        menuBar()->clear();
+        QVLCMenu::createMenuBar(this, p_intf, true, advControlsEnabled );
+        playlist();
+    }
+}
+
+/************************************************************************
+ * Other stuff
+ ************************************************************************/
+void MainInterface::keyPressEvent( QKeyEvent *e )
+{
+    int i_vlck = 0;
+    /* Handle modifiers */
+    if( e->modifiers()& Qt::ShiftModifier ) i_vlck |= KEY_MODIFIER_SHIFT;
+    if( e->modifiers()& Qt::AltModifier ) i_vlck |= KEY_MODIFIER_ALT;
+    if( e->modifiers()& Qt::ControlModifier ) i_vlck |= KEY_MODIFIER_CTRL;
+    if( e->modifiers()& Qt::MetaModifier ) i_vlck |= KEY_MODIFIER_META;
+
+    bool found = false;
+    /* Look for some special keys */
+#define HANDLE( qt, vk ) case Qt::qt : i_vlck |= vk; found = true;break
+    switch( e->key() )
+    {
+        HANDLE( Key_Left, KEY_LEFT );
+        HANDLE( Key_Right, KEY_RIGHT );
+        HANDLE( Key_Up, KEY_UP );
+        HANDLE( Key_Down, KEY_DOWN );
+        HANDLE( Key_Space, KEY_SPACE );
+        HANDLE( Key_Escape, KEY_ESC );
+        HANDLE( Key_Enter, KEY_ENTER );
+        HANDLE( Key_F1, KEY_F1 );
+        HANDLE( Key_F2, KEY_F2 );
+        HANDLE( Key_F3, KEY_F3 );
+        HANDLE( Key_F4, KEY_F4 );
+        HANDLE( Key_F5, KEY_F5 );
+        HANDLE( Key_F6, KEY_F6 );
+        HANDLE( Key_F7, KEY_F7 );
+        HANDLE( Key_F8, KEY_F8 );
+        HANDLE( Key_F9, KEY_F9 );
+        HANDLE( Key_F10, KEY_F10 );
+        HANDLE( Key_F11, KEY_F11 );
+        HANDLE( Key_F12, KEY_F12 );
+        HANDLE( Key_PageUp, KEY_PAGEUP );
+        HANDLE( Key_PageDown, KEY_PAGEDOWN );
+        HANDLE( Key_Home, KEY_HOME );
+        HANDLE( Key_End, KEY_END );
+        HANDLE( Key_Insert, KEY_INSERT );
+        HANDLE( Key_Delete, KEY_DELETE );
+
+    }
+    if( !found )
+    {
+        /* Force lowercase */
+        if( e->key() >= Qt::Key_A && e->key() <= Qt::Key_Z )
+            i_vlck += e->key() + 32;
+        /* Rest of the ascii range */
+        else if( e->key() >= Qt::Key_Space && e->key() <= Qt::Key_AsciiTilde )
+            i_vlck += e->key();
+    }
+    if( i_vlck >= 0 )
+    {
+        var_SetInteger( p_intf->p_libvlc, "key-pressed", i_vlck );
+        e->accept();
+    }
+    else
+        e->ignore();
+}
+
+void MainInterface::stop()
+{
+    playlist_Stop( THEPL );
+}
+void MainInterface::play()
+{
+    if( !THEPL->i_size || !THEPL->i_enabled )
+    {
+        /* The playlist is empty, open a file requester */
+        THEDP->simpleOpenDialog();
+        setStatus( 0 );
+        return;
+    }
+    THEMIM->togglePlayPause();
+}
+void MainInterface::prev()
+{
+    playlist_Prev( THEPL );
+}
+void MainInterface::next()
+{
+    playlist_Next( THEPL );
+}
+
+void MainInterface::setDisplay( float pos, int time, int length )
+{
+    char psz_length[MSTRTIME_MAX_SIZE], psz_time[MSTRTIME_MAX_SIZE];
+    secstotimestr( psz_length, length );
+    secstotimestr( psz_time, time );
+    QString title;
+    title.sprintf( "%s/%s", psz_time, psz_length );
+    timeLabel->setText( " "+title+" " );
+}
+
+void MainInterface::setName( QString name )
+{
+    nameLabel->setText( " " + name+" " );
+}
+
+void MainInterface::setStatus( int status )
+{
+    if( status == 1 ) // Playing
+        ui.playButton->setIcon( QIcon( ":/pixmaps/pause.png" ) );
+    else
+        ui.playButton->setIcon( QIcon( ":/pixmaps/play.png" ) );
+}
+
+static bool b_my_volume;
+
 void MainInterface::updateOnTimer()
 {
+    aout_instance_t *p_aout = (aout_instance_t *)vlc_object_find( p_intf,
+                                    VLC_OBJECT_AOUT, FIND_ANYWHERE );
+    /* Todo: make this event-driven */
+    if( p_aout )
+    {
+        ui.visualButton->setEnabled( true );
+        vlc_object_release( p_aout );
+    }
+    else
+        ui.visualButton->setEnabled( false );
+
+    /* And this too */
+    advControls->enableInput( THEMIM->getIM()->hasInput() );
+    advControls->enableVideo( THEMIM->getIM()->hasVideo() );
+
+    if( p_intf->b_die )
+    {
+        QApplication::closeAllWindows();
+        DialogsProvider::killInstance();
+        QApplication::quit();
+    }
+    if( need_components_update )
+    {
+        doComponentsUpdate();
+        need_components_update = false;
+    }
+
+    audio_volume_t i_volume;
+    aout_VolumeGet( p_intf, &i_volume );
+    i_volume = (i_volume *  200 )/ AOUT_VOLUME_MAX ;
+    int i_gauge = ui.volumeSlider->value();
+    b_my_volume = false;
+    if( i_volume - i_gauge > 1 || i_gauge - i_volume > 1 )
+    {
+        b_my_volume = true;
+        ui.volumeSlider->setValue( i_volume );
+        b_my_volume = false;
+    }
+}
+
+void MainInterface::closeEvent( QCloseEvent *e )
+{
+    hide();
+    p_intf->b_die = VLC_TRUE;
+}
 
+void MainInterface::updateVolume( int sliderVolume )
+{
+    if( !b_my_volume )
+    {
+        int i_res = sliderVolume * AOUT_VOLUME_MAX /
+                            (2*ui.volumeSlider->maximum() );
+        aout_VolumeSet( p_intf, i_res );
+    }
+}
+
+static int InteractCallback( vlc_object_t *p_this,
+                             const char *psz_var, vlc_value_t old_val,
+                             vlc_value_t new_val, void *param )
+{
+    intf_dialog_args_t *p_arg = new intf_dialog_args_t;
+    p_arg->p_dialog = (interaction_dialog_t *)(new_val.p_address);
+    DialogEvent *event = new DialogEvent( INTF_DIALOG_INTERACTION, 0, p_arg );
+    QApplication::postEvent( THEDP, static_cast<QEvent*>(event) );
+    return VLC_SUCCESS;
 }