Blend in a toggle button when hovering items. This allows selecting items without using the rubberband or Ctrl/Shift-keys in the single-click mode. Any feedback from users is highly welcome (I think people will either love or hate this feature, I'm really not sure -> it can be turned off too).

svn path=/trunk/KDE/kdebase/apps/; revision=766901

1 files changed, 113 insertions, 0 deletions

diff --git a/src/selectiontoggle.cpp b/src/selectiontoggle.cpp
new file mode 100644
index 000000000..244f51583
--- /dev/null
+++ b/src/selectiontoggle.cpp
@@ -0,0 +1,113 @@
+/***************************************************************************
+ *   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 <kdebug.h>
+
+SelectionToggle::SelectionToggle(QWidget* parent) :
+    QAbstractButton(parent),
+    m_showIcon(false),
+    m_isHovered(false),
+    m_icon(),
+    m_timer(0)
+{
+    parent->installEventFilter(this);
+    resize(sizeHint());
+    m_icon = KIconLoader::global()->loadIcon("dialog-ok",
+                                             KIconLoader::NoGroup,
+                                             KIconLoader::SizeSmall);
+    m_timer = new QTimer(this);
+    connect(m_timer, SIGNAL(timeout()),
+            this, SLOT(showIcon()));
+}
+
+SelectionToggle::~SelectionToggle()
+{
+}
+
+QSize SelectionToggle::sizeHint() const
+{
+    return QSize(16, 16);
+}
+
+void SelectionToggle::setVisible(bool visible)
+{
+    QAbstractButton::setVisible(visible);
+    if (visible) {
+        m_timer->start(1000);
+    } else {
+        m_timer->stop();
+        m_showIcon = false;
+    }
+}
+
+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);
+    m_isHovered = true;
+    m_showIcon = true;
+    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_showIcon) {
+        painter.drawPixmap(0, 0, m_icon);
+    }
+}
+
+void SelectionToggle::showIcon()
+{
+    m_showIcon = true;
+    update();
+}
+
+#include "selectiontoggle.moc"