1 files changed, 86 insertions, 0 deletions
diff --git a/qt4/faderwidget.cpp b/qt4/faderwidget.cpp
new file mode 100644
index 000000000..c8d95e82a
--- /dev/null
+++ b/qt4/faderwidget.cpp
@@ -0,0 +1,86 @@
+/****************************************************************************
+**
+** Copyright (C) 2006 Trolltech AS. All rights reserved.
+**
+** This file is part of the documentation of Qt. It was originally
+** published as part of Qt Quarterly.
+**
+** This file may be used under the terms of the GNU General Public License
+** version 2.0 as published by the Free Software Foundation or under the
+** terms of the Qt Commercial License Agreement. The respective license
+** texts for these are provided with the open source and commercial
+** editions of Qt.
+**
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://www.trolltech.com/products/qt/licensing.html or contact the
+** sales department at [email protected].
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "faderwidget.h"
+
+FaderWidget::FaderWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    if (parent) {
+        startColor = endColor = parent->palette().window().color();
+    } else {
+        startColor = endColor = Qt::white;
+    }
+
+    currentAlpha = 0;
+    duration = 333;
+    fadeOut = false;
+
+    timer = new QTimer(this);
+    connect(timer, SIGNAL(timeout()), this, SLOT(update()));
+
+    setAttribute(Qt::WA_DeleteOnClose);
+    resize(parent->size());
+}
+
+void FaderWidget::start()
+{
+    currentAlpha = 255;
+    fadeOut = false;
+    timer->start(33);
+    show();
+}
+
+void FaderWidget::startFadeOut()
+{
+    currentAlpha = 0;
+    fadeOut = true;
+    timer->start(33);
+    show();
+}
+
+void FaderWidget::paintEvent(QPaintEvent * /* event */)
+{
+    QPainter painter(this);
+    QColor semiTransparentColor = startColor;
+    semiTransparentColor.setAlpha(currentAlpha);
+    painter.fillRect(rect(), semiTransparentColor);
+
+    if (fadeOut) {
+        currentAlpha += 255 * timer->interval() / duration;
+        if (currentAlpha >= 255) {
+            timer->stop();
+            emit done( (QWidget *)parent() );
+            close();
+        }
+    } else {
+        currentAlpha -= 255 * timer->interval() / duration;
+        if (currentAlpha <= 0) {
+            timer->stop();
+            emit done( (QWidget *)parent() );
+            close();
+        }
+    }
+}