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List:       kde-commits
Subject:    [kate] part/view: add simple KateFadeEffect
From:       Dominik Haumann <dhaumann () kde ! org>
Date:       2013-03-31 20:20:00
Message-ID: 20130331202000.A0624A6059 () git ! kde ! org
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Git commit 99aeb72c7d847244d80c22375771be30ca5c062a by Dominik Haumann.
Committed on 31/03/2013 at 11:23.
Pushed by dhaumann into branch 'master'.

add simple KateFadeEffect

Example:
  KateFadeEffect* fadeEffect = new KateFadeEffect(someWidget);
  fadeEffect->fadeIn();
  // ...
  fadeEffect->fadeOut();

Maybe of interest for:
CCMAIL: agateau@kde.org

A  +85   -0    part/view/katefadeeffect.cpp     [License: LGPL (v2+)]
A  +79   -0    part/view/katefadeeffect.h     [License: LGPL (v2+)]

http://commits.kde.org/kate/99aeb72c7d847244d80c22375771be30ca5c062a

diff --git a/part/view/katefadeeffect.cpp b/part/view/katefadeeffect.cpp
new file mode 100644
index 0000000..36262e8
--- /dev/null
+++ b/part/view/katefadeeffect.cpp
@@ -0,0 +1,85 @@
+/* This file is part of the KDE and the Kate project
+ *
+ *   Copyright (C) 2013 Dominik Haumann <dhaumann@kde.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ */
+
+#include "katefadeeffect.h"
+#include "katefadeeffect.moc"
+
+#include <QWidget>
+#include <QTimeLine>
+#include <QGraphicsOpacityEffect>
+
+static const int frameRange = 40;
+
+KateFadeEffect::KateFadeEffect(QWidget* widget)
+  : QObject(widget)
+  , m_widget(widget)
+{
+  m_timeLine = new QTimeLine(10000, this);
+  m_timeLine->setFrameRange(0, frameRange);
+  m_effect = new QGraphicsOpacityEffect(this);
+  m_effect->setOpacity(1.0);
+  m_widget->setGraphicsEffect(m_effect);
+
+  connect(m_timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(opacityChanged(qreal)));
+  connect(m_timeLine, SIGNAL(finished()), this, SLOT(animationFinished()));
+}
+
+void KateFadeEffect::fadeIn()
+{
+  if (!m_widget || m_widget->isVisible()) {
+    return;
+  }
+
+  m_timeLine->setDirection(QTimeLine::Forward);
+  m_effect->setOpacity(0.0);
+  m_widget->show();
+  m_timeLine->start();
+}
+
+void KateFadeEffect::fadeOut()
+{
+  if (!m_widget || !m_widget->isVisible()) {
+    return;
+  }
+
+  m_effect->setOpacity(1.0);
+  m_timeLine->setDirection(QTimeLine::Backward);
+  m_timeLine->start();
+}
+
+void KateFadeEffect::opacityChanged(qreal value)
+{
+  if (m_widget) {
+    m_effect->setOpacity(value);
+  }
+}
+
+void KateFadeEffect::animationFinished()
+{
+  if (!m_widget) {
+    return;
+  }
+
+  if (m_timeLine->direction() == QTimeLine::Backward) {
+    m_widget->hide();
+  }
+}
+
+// kate: space-indent on; indent-width 2; replace-tabs on;
diff --git a/part/view/katefadeeffect.h b/part/view/katefadeeffect.h
new file mode 100644
index 0000000..befcbcf
--- /dev/null
+++ b/part/view/katefadeeffect.h
@@ -0,0 +1,79 @@
+/* This file is part of the KDE and the Kate project
+ *
+ *   Copyright (C) 2013 Dominik Haumann <dhaumann@kde.org>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ */
+
+#ifndef KATE_FADE_EFFECT_H
+#define KATE_FADE_EFFECT_H
+
+#include <QObject>
+#include <QPointer>
+
+class QWidget;
+class QTimeLine;
+class QGraphicsOpacityEffect;
+/**
+ * This class provides a fade in/out effect for arbitrary QWidget%s.
+ * Example:
+ * \code
+ * KateFadeEffect* fadeEffect = new KateFadeEffect(someWidget);
+ * fadeEffect->fadeIn();
+ * //...
+ * fadeEffect->fadeOut();
+ * \endcode
+ */
+class KateFadeEffect : public QObject
+{
+  Q_OBJECT
+
+  public:
+    /**
+     * Constructor.
+     * By default, the widget is fully opaque (opacity = 1.0).
+     */
+    KateFadeEffect(QWidget* widget = 0);
+
+  public Q_SLOTS:
+    /**
+     * Call to fade out and hide the widget.
+     */
+    void fadeOut();
+    /**
+     * Call to show and fade in the widget
+     */
+    void fadeIn();
+
+  protected Q_SLOTS:
+    /**
+     * Helper to update opacity value
+     */
+    void opacityChanged(qreal value);
+    /**
+     * When the animation is finished, hide the widget if fading out.
+     */
+    void animationFinished();
+
+  private:
+    QPointer<QWidget> m_widget;         ///< the fading widget
+    QTimeLine* m_timeLine;              ///< update time line
+    QGraphicsOpacityEffect* m_effect;   ///< graphics opacity effect
+};
+
+#endif
+
+// kate: space-indent on; indent-width 2; replace-tabs on;

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