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src/libtomahawk/playlist/dynamic/widgets/LoadingSpinner.cpp

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+/****************************************************************************************
+ * Copyright (c) 2011 Leo Franchi <lfranchi@kde.org>                                    *
+ *                                                                                      *
+ * 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 (at your option) any later           *
+ * version.                                                                             *
+ *                                                                                      *
+ * 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, see <http://www.gnu.org/licenses/>.                           *
+ ****************************************************************************************/
+
+#include "LoadingSpinner.h"
+
+#include "tomahawk/tomahawkapp.h"
+
+#include <QTimeLine>
+#include <QPaintEvent>
+#include <QPainter>
+#include <qmovie.h>
+#include <QLabel>
+
+#define ANIM_LENGTH 300
+
+LoadingSpinner::LoadingSpinner( QWidget* parent )
+    : QWidget(parent)
+    , m_showHide( new QTimeLine )
+{
+    m_showHide->setDuration( 300 );
+    m_showHide->setStartFrame( 0 );
+    m_showHide->setEndFrame( 100 );
+    m_showHide->setUpdateInterval( 20  );
+    connect( m_showHide, SIGNAL( frameChanged( int ) ), this, SLOT( update() ) );
+    connect( m_showHide, SIGNAL( finished() ), this, SLOT( hideFinished() ) );
+    
+    m_anim = new QMovie( RESPATH "/images/loading-animation.gif" );
+    
+    connect( m_anim, SIGNAL( frameChanged( int ) ), this, SLOT( update() ) );
+    
+    hide();
+}
+
+LoadingSpinner::~LoadingSpinner()
+{
+
+}
+
+void 
+LoadingSpinner::fadeIn()
+{
+    show();
+    m_anim->start();
+    m_showHide->setDirection( QTimeLine::Forward );
+    m_showHide->start();
+}
+
+void 
+LoadingSpinner::fadeOut()
+{
+    m_showHide->setDirection( QTimeLine::Backward );
+    m_showHide->start();
+}
+
+void 
+LoadingSpinner::hideFinished()
+{
+    if( m_showHide->direction() == QTimeLine::Backward ) {
+        hide();
+        m_anim->stop();
+    }
+}
+
+
+QSize 
+LoadingSpinner::sizeHint() const
+{
+    return QSize( 64, 64 );
+}
+
+void 
+LoadingSpinner::resizeEvent( QResizeEvent* )
+{
+    reposition();
+}
+
+void 
+LoadingSpinner::reposition()
+{
+    if( !parentWidget() )
+        return;
+    
+    int x = ( parentWidget()->width() / 2 ) - ( width() / 2 );
+    int y = ( parentWidget()->height() / 2 ) - ( height() / 2 );
+    move( x, y );
+}
+
+
+void 
+LoadingSpinner::paintEvent( QPaintEvent* ev )
+{
+    QPainter p( this );
+    
+    qDebug() << "FADING" << ( m_showHide->state() == QTimeLine::Running ) << "at frame:" << m_showHide->currentValue();
+    if( m_showHide->state() == QTimeLine::Running ) { // showing or hiding
+        p.setOpacity( (qreal)m_showHide->currentValue() );
+    }
+    p.drawPixmap( rect(), m_anim->currentPixmap() );
+    
+    
+}
+

src/libtomahawk/playlist/dynamic/widgets/LoadingSpinner.h

@@ -0,0 +1,52 @@
+/****************************************************************************************
+ * Copyright (c) 2011 Leo Franchi <lfranchi@kde.org>                                    *
+ *                                                                                      *
+ * 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 (at your option) any later           *
+ * version.                                                                             *
+ *                                                                                      *
+ * 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, see <http://www.gnu.org/licenses/>.                           *
+ ****************************************************************************************/
+
+#ifndef LOADING_SPINNER_H
+#define LOADING_SPINNER_H
+
+#include <QWidget>
+
+class QMovie;
+class QTimeLine;
+/**
+ * A small widget that displays an animated loading spinner
+ */
+class LoadingSpinner : public QWidget {
+    Q_OBJECT
+public:
+    LoadingSpinner( QWidget* parent );
+    virtual ~LoadingSpinner();
+    
+    virtual QSize sizeHint() const;
+    virtual void paintEvent( QPaintEvent* );
+    virtual void resizeEvent( QResizeEvent* );
+    
+    void fadeIn();
+    void fadeOut();
+    
+private slots:
+    void hideFinished();
+    
+private:
+    void reposition();
+    
+    QTimeLine* m_showHide;
+    QMovie* m_anim;
+};
+
+#endif
+
+class QPaintEvent;