* Added OverlayButton.

src/libtomahawk/widgets/OverlayButton.cpp

@@ -0,0 +1,162 @@
+/* === This file is part of Tomahawk Player - <http://tomahawk-player.org> ===
+ *
+ *   Copyright 2010-2011, Christian Muehlhaeuser <muesli@tomahawk-player.org>
+ *
+ *   Tomahawk 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 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Tomahawk 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 Tomahawk. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "OverlayButton.h"
+
+#include <QPainter>
+#include <QPropertyAnimation>
+
+#include "utils/logger.h"
+
+#define CORNER_ROUNDNESS 8.0
+#define FADING_DURATION 500
+#define FONT_SIZE 16
+#define OPACITY 0.70
+
+
+OverlayButton::OverlayButton( QWidget* parent )
+    : QPushButton( parent ) // this is on purpose!
+    , m_opacity( 0.0 )
+    , m_parent( parent )
+{
+    resize( 160, 26 );
+    setAttribute( Qt::WA_TranslucentBackground, true );
+
+    setOpacity( m_opacity );
+
+    m_timer.setSingleShot( true );
+    connect( &m_timer, SIGNAL( timeout() ), this, SLOT( hide() ) );
+
+#ifdef Q_WS_MAC
+    QFont f( font() );
+    f.setPointSize( f.pointSize() - 2 );
+    setFont( f );
+#endif
+}
+
+
+OverlayButton::~OverlayButton()
+{
+}
+
+
+void
+OverlayButton::setOpacity( qreal opacity )
+{
+    m_opacity = opacity;
+
+    if ( m_opacity == 0.00 && !isHidden() )
+    {
+        QPushButton::hide();
+    }
+    else if ( m_opacity > 0.00 && isHidden() )
+    {
+        QPushButton::show();
+    }
+
+    repaint();
+}
+
+
+void
+OverlayButton::setText( const QString& text )
+{
+    m_text = text;
+}
+
+
+void
+OverlayButton::show( int timeoutSecs )
+{
+    QPropertyAnimation* animation = new QPropertyAnimation( this, "opacity" );
+    animation->setDuration( FADING_DURATION );
+    animation->setEndValue( 1.0 );
+    animation->start();
+
+    if( timeoutSecs > 0 )
+        m_timer.start( timeoutSecs * 1000 );
+}
+
+
+void
+OverlayButton::hide()
+{
+    QPropertyAnimation* animation = new QPropertyAnimation( this, "opacity" );
+    animation->setDuration( FADING_DURATION );
+    animation->setEndValue( 0.00 );
+    animation->start();
+}
+
+
+bool
+OverlayButton::shown() const
+{
+    if ( !isEnabled() )
+        return false;
+
+    return m_opacity == OPACITY;
+}
+
+
+void
+OverlayButton::paintEvent( QPaintEvent* event )
+{
+    Q_UNUSED( event );
+    QPoint corner( m_parent->contentsRect().width() - width() - 12, m_parent->height() - height() - 12 );
+    move( corner );
+
+    QPainter p( this );
+    QRect r = contentsRect();
+
+    p.setBackgroundMode( Qt::TransparentMode );
+    p.setRenderHint( QPainter::Antialiasing );
+    p.setOpacity( m_opacity );
+
+    QPen pen( palette().dark().color(), .5 );
+    p.setPen( pen );
+    p.setBrush( QColor( 30, 30, 30, 255.0 * OPACITY ) );
+
+    p.drawRoundedRect( r, CORNER_ROUNDNESS, CORNER_ROUNDNESS );
+
+    QTextOption to( Qt::AlignCenter );
+    to.setWrapMode( QTextOption::WrapAtWordBoundaryOrAnywhere );
+
+    // shrink to fit if needed
+    QFont f( font() );
+    f.setPointSize( FONT_SIZE );
+    f.setBold( true );
+
+    QRectF textRect = r.adjusted( 8, 8, -8, -8 );
+    qreal availHeight = textRect.height();
+
+    QFontMetricsF fm( f );
+    qreal textHeight = fm.boundingRect( textRect, Qt::AlignCenter | Qt::TextWordWrap, text() ).height();
+    while ( textHeight > availHeight )
+    {
+        if ( f.pointSize() <= 4 ) // don't try harder
+            break;
+
+        f.setPointSize( f.pointSize() - 1 );
+        fm = QFontMetricsF( f );
+        textHeight = fm.boundingRect( textRect, Qt::AlignCenter | Qt::TextWordWrap, text() ).height();
+    }
+
+    p.setFont( f );
+    p.setPen( Qt::white );
+    p.drawText( r.adjusted( 8, 8, -8, -8 ), text(), to );
+}

src/libtomahawk/widgets/OverlayButton.h

@@ -0,0 +1,61 @@
+/* === This file is part of Tomahawk Player - <http://tomahawk-player.org> ===
+ *
+ *   Copyright 2010-2011, Christian Muehlhaeuser <muesli@tomahawk-player.org>
+ *
+ *   Tomahawk 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 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Tomahawk 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 Tomahawk. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef OVERLAYBUTTON_H
+#define OVERLAYBUTTON_H
+
+#include <QPushButton>
+#include <QAbstractItemView>
+#include <QTimer>
+
+#include "dllmacro.h"
+
+class DLLEXPORT OverlayButton : public QPushButton
+{
+Q_OBJECT
+Q_PROPERTY( qreal opacity READ opacity WRITE setOpacity )
+
+public:
+    OverlayButton( QWidget* parent );
+    ~OverlayButton();
+
+    qreal opacity() const { return m_opacity; }
+    void setOpacity( qreal opacity );
+
+    QString text() const { return m_text; }
+    void setText( const QString& text );
+
+    bool shown() const;
+
+public slots:
+    void show( int timeoutSecs = 0 );
+    void hide();
+
+protected:
+//    void changeEvent( QEvent* e );
+    void paintEvent( QPaintEvent* event );
+
+private:
+    QString m_text;
+    qreal m_opacity;
+
+    QWidget* m_parent;
+    QTimer m_timer;
+};
+
+#endif // OVERLAYBUTTON_H