Merged very early alpha-version of Dolphin 2.0

Dolphin 2.0 will get a new view-engine with the
following improvements:
- Better performance
- Animated transitions
- No clipped filenames due to dynamic item-sizes
- Grouping support for all view-modes
- Non-rectangular selection areas
- Simplified code for better maintenance

More details will be provided in a blog-entry during
the next days.

Please note that the code is in a very
early alpha-stage and although the most tricky parts
have been implemented already very basic things like
drag and drop or selections have not been pushed yet.
Those things are rather trivial to implement but this
still will take some time.

1 files changed, 260 insertions, 0 deletions

diff --git a/src/kitemviews/kitemlistwidget.cpp b/src/kitemviews/kitemlistwidget.cpp
new file mode 100644
index 000000000..3f08d9f7a
--- /dev/null
+++ b/src/kitemviews/kitemlistwidget.cpp
@@ -0,0 +1,260 @@
+/***************************************************************************
+ *   Copyright (C) 2011 by Peter Penz <[email protected]>             *
+ *                                                                         *
+ *   Based on the Itemviews NG project from Trolltech Labs:                *
+ *   http://qt.gitorious.org/qt-labs/itemviews-ng                          *
+ *                                                                         *
+ *   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 "kitemlistwidget.h"
+
+#include "kitemlistview.h"
+#include "kitemmodelbase.h"
+
+#include <KDebug>
+
+#include <QPainter>
+#include <QPropertyAnimation>
+#include <QStyle>
+
+KItemListWidget::KItemListWidget(QGraphicsItem* parent) :
+    QGraphicsWidget(parent, 0),
+    m_index(-1),
+    m_data(),
+    m_visibleRoles(),
+    m_visibleRolesSizes(),
+    m_styleOption(),
+    m_hoverOpacity(0),
+    m_hoverCache(0),
+    m_hoverAnimation(0)
+{
+}
+
+KItemListWidget::~KItemListWidget()
+{
+    clearCache();
+}
+
+void KItemListWidget::setIndex(int index)
+{
+    if (m_index != index) {
+        if (m_hoverAnimation) {
+            m_hoverAnimation->stop();
+            m_hoverOpacity = 0;
+        }
+        clearCache();
+
+        m_index = index;
+    }
+}
+
+int KItemListWidget::index() const
+{
+    return m_index;
+}
+
+void KItemListWidget::setData(const QHash<QByteArray, QVariant>& data,
+                              const QSet<QByteArray>& roles)
+{
+    clearCache();
+    if (roles.isEmpty()) {
+        m_data = data;
+        dataChanged(m_data);
+    } else {
+        foreach (const QByteArray& role, roles) {
+            m_data[role] = data[role];
+        }
+        dataChanged(m_data, roles);
+    }
+}
+
+QHash<QByteArray, QVariant> KItemListWidget::data() const
+{
+    return m_data;
+}
+
+void KItemListWidget::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
+{
+    Q_UNUSED(option);
+    if (m_hoverOpacity <= 0.0) {
+        return;
+    }
+
+    const QRect hoverBounds = hoverBoundingRect().toRect();
+    if (!m_hoverCache) {
+        m_hoverCache = new QPixmap(hoverBounds.size());
+        m_hoverCache->fill(Qt::transparent);
+
+        QPainter pixmapPainter(m_hoverCache);
+
+        QStyleOptionViewItemV4 viewItemOption;
+        viewItemOption.initFrom(widget);
+        viewItemOption.rect = QRect(0, 0, hoverBounds.width(), hoverBounds.height());
+        viewItemOption.state = QStyle::State_Enabled | QStyle::State_MouseOver;
+        viewItemOption.viewItemPosition = QStyleOptionViewItemV4::OnlyOne;
+
+        widget->style()->drawPrimitive(QStyle::PE_PanelItemViewItem, &viewItemOption, &pixmapPainter, widget);
+    }
+
+    const qreal opacity = painter->opacity();
+    painter->setOpacity(m_hoverOpacity * opacity);
+    painter->drawPixmap(hoverBounds.topLeft(), *m_hoverCache);
+    painter->setOpacity(opacity);
+}
+
+void KItemListWidget::setVisibleRoles(const QHash<QByteArray, int>& roles)
+{
+    const QHash<QByteArray, int> previousRoles = m_visibleRoles;
+    m_visibleRoles = roles;
+    visibleRolesChanged(roles, previousRoles);
+}
+
+QHash<QByteArray, int> KItemListWidget::visibleRoles() const
+{
+    return m_visibleRoles;
+}
+
+void KItemListWidget::setVisibleRolesSizes(const QHash<QByteArray, QSizeF> rolesSizes)
+{
+    const QHash<QByteArray, QSizeF> previousRolesSizes = m_visibleRolesSizes;
+    m_visibleRolesSizes = rolesSizes;
+    visibleRolesSizesChanged(rolesSizes, previousRolesSizes);
+}
+
+QHash<QByteArray, QSizeF> KItemListWidget::visibleRolesSizes() const
+{
+    return m_visibleRolesSizes;
+}
+
+void KItemListWidget::setStyleOption(const KItemListStyleOption& option)
+{
+    const KItemListStyleOption previous = m_styleOption;
+    if (m_index >= 0) {
+        clearCache();
+
+        const bool wasHovered = (previous.state & QStyle::State_MouseOver);
+        m_styleOption = option;
+        const bool isHovered = (m_styleOption.state & QStyle::State_MouseOver);
+
+        if (wasHovered != isHovered) {
+            // The hovering state has been changed. Assure that a fade-animation
+            // is done to the new state.
+            if (!m_hoverAnimation) {
+                m_hoverAnimation = new QPropertyAnimation(this, "hoverOpacity", this);
+                m_hoverAnimation->setDuration(200);
+            }
+            m_hoverAnimation->stop();
+
+            if (!wasHovered && isHovered) {
+                m_hoverAnimation->setEndValue(1.0);
+            } else {
+                Q_ASSERT(wasHovered && !isHovered);
+                m_hoverAnimation->setEndValue(0.0);
+            }
+
+            m_hoverAnimation->start();
+        }
+    } else {
+        m_styleOption = option;
+    }
+
+    styleOptionChanged(option, previous);
+}
+
+const KItemListStyleOption& KItemListWidget::styleOption() const
+{
+    return m_styleOption;
+}
+
+bool KItemListWidget::contains(const QPointF& point) const
+{
+    return hoverBoundingRect().contains(point) ||
+           expansionToggleRect().contains(point) ||
+           selectionToggleRect().contains(point);
+}
+
+QRectF KItemListWidget::hoverBoundingRect() const
+{
+    return QRectF(QPointF(0, 0), size());
+}
+
+QRectF KItemListWidget::selectionToggleRect() const
+{
+    return QRectF();
+}
+
+QRectF KItemListWidget::expansionToggleRect() const
+{
+    return QRectF();
+}
+
+void KItemListWidget::dataChanged(const QHash<QByteArray, QVariant>& current,
+                                  const QSet<QByteArray>& roles)
+{
+    Q_UNUSED(current);
+    Q_UNUSED(roles);
+    update();
+}
+
+void KItemListWidget::visibleRolesChanged(const QHash<QByteArray, int>& current,
+                                          const QHash<QByteArray, int>& previous)
+{
+    Q_UNUSED(current);
+    Q_UNUSED(previous);
+    update();
+}
+
+void KItemListWidget::visibleRolesSizesChanged(const QHash<QByteArray, QSizeF>& current,
+                                               const QHash<QByteArray, QSizeF>& previous)
+{
+    Q_UNUSED(current);
+    Q_UNUSED(previous);
+    update();
+}
+
+void KItemListWidget::styleOptionChanged(const KItemListStyleOption& current,
+                                         const KItemListStyleOption& previous)
+{
+    Q_UNUSED(current);
+    Q_UNUSED(previous);
+    update();
+}
+
+void KItemListWidget::resizeEvent(QGraphicsSceneResizeEvent* event)
+{
+    QGraphicsWidget::resizeEvent(event);
+    clearCache();
+}
+
+qreal KItemListWidget::hoverOpacity() const
+{
+    return m_hoverOpacity;
+}
+
+void KItemListWidget::setHoverOpacity(qreal opacity)
+{
+    m_hoverOpacity = opacity;
+    update();
+}
+
+void KItemListWidget::clearCache()
+{
+    delete m_hoverCache;
+    m_hoverCache = 0;
+}
+
+#include "kitemlistwidget.moc"