1 files changed, 171 insertions, 0 deletions
diff --git a/src/selectiontoggle.cpp b/src/selectiontoggle.cpp
new file mode 100644
index 000000000..7a3f0ef56
--- /dev/null
+++ b/src/selectiontoggle.cpp
@@ -0,0 +1,171 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Peter Penz <[email protected]>                  *
+ *                                                                         *
+ *   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, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#include "selectiontoggle.h"
+
+#include <kicon.h>
+#include <kiconloader.h>
+#include <kiconeffect.h>
+
+#include <QPainter>
+#include <QPaintEvent>
+#include <QRect>
+#include <QTimer>
+#include <QTimeLine>
+
+SelectionToggle::SelectionToggle(QWidget* parent) :
+    QAbstractButton(parent),
+    m_isHovered(false),
+    m_fadingValue(0),
+    m_icon(),
+    m_fadingTimeLine(0)
+{
+    parent->installEventFilter(this);
+    resize(sizeHint());
+    m_icon = KIconLoader::global()->loadIcon("dialog-ok",
+                                             KIconLoader::NoGroup,
+                                             KIconLoader::SizeSmall);
+}
+
+SelectionToggle::~SelectionToggle()
+{
+}
+
+QSize SelectionToggle::sizeHint() const
+{
+    return QSize(16, 16);
+}
+
+void SelectionToggle::reset()
+{
+    m_item = KFileItem();
+    hide();
+}
+
+void SelectionToggle::setFileItem(const KFileItem& item)
+{
+    m_item = item;
+    if (!item.isNull()) {
+        startFading();
+    }
+}
+
+KFileItem SelectionToggle::fileItem() const
+{
+    return m_item;
+}
+
+void SelectionToggle::setVisible(bool visible)
+{
+    QAbstractButton::setVisible(visible);
+
+    stopFading();
+    if (visible) {
+        startFading();
+    }
+
+}
+
+bool SelectionToggle::eventFilter(QObject* obj, QEvent* event)
+{
+    if ((obj == parent()) && (event->type() == QEvent::Leave)) {
+        hide();
+    }
+    return QAbstractButton::eventFilter(obj, event);
+}
+
+void SelectionToggle::enterEvent(QEvent* event)
+{
+    QAbstractButton::enterEvent(event);
+
+    // if the mouse cursor is above the selection toggle, display
+    // it immediately without fading timer
+    m_isHovered = true;
+    if (m_fadingTimeLine != 0) {
+        m_fadingTimeLine->stop();
+    }
+    m_fadingValue = 255;
+    update();
+}
+
+void SelectionToggle::leaveEvent(QEvent* event)
+{
+    QAbstractButton::leaveEvent(event);
+    m_isHovered = false;
+    update();
+}
+
+void SelectionToggle::paintEvent(QPaintEvent* event)
+{
+    QPainter painter(this);
+    painter.setClipRect(event->rect());
+
+    if (m_isHovered) {
+        KIconEffect iconEffect;
+        QPixmap activeIcon = iconEffect.apply(m_icon, KIconLoader::Desktop, KIconLoader::ActiveState);
+        painter.drawPixmap(0, 0, activeIcon);
+    } else {
+        if (m_fadingValue < 255) {
+            // apply an alpha mask respecting the fading value to the icon
+            QPixmap icon = m_icon;
+            QPixmap alphaMask(icon.width(), icon.height());
+            const QColor color(m_fadingValue, m_fadingValue, m_fadingValue);
+            alphaMask.fill(color);
+            icon.setAlphaChannel(alphaMask);
+            painter.drawPixmap(0, 0, icon);
+        } else {
+            // no fading is required
+            painter.drawPixmap(0, 0, m_icon);
+        }
+    }
+}
+
+void SelectionToggle::setFadingValue(int value)
+{
+    m_fadingValue = value;
+    if (m_fadingValue >= 255) {
+        Q_ASSERT(m_fadingTimeLine != 0);
+        m_fadingTimeLine->stop();
+    }
+    update();
+}
+
+void SelectionToggle::startFading()
+{
+    Q_ASSERT(m_fadingTimeLine == 0);
+
+    m_fadingTimeLine = new QTimeLine(2000, this);
+    connect(m_fadingTimeLine, SIGNAL(frameChanged(int)),
+            this, SLOT(setFadingValue(int)));
+    m_fadingTimeLine->setFrameRange(0, 255);
+    m_fadingTimeLine->start();
+    m_fadingValue = 0;
+}
+
+void SelectionToggle::stopFading()
+{
+    if (m_fadingTimeLine != 0) {
+        m_fadingTimeLine->stop();
+        delete m_fadingTimeLine;
+        m_fadingTimeLine = 0;
+    }
+    m_fadingValue = 0;
+}
+
+#include "selectiontoggle.moc"