QQuickItemViewFxItem: factor out FxViewItem from QQuickItemView

FxItemViews wraps the QQuickItems used in QQuickItemView with
additional item view information, like transition status.

This patch will factor out FxItemView so that it can be reused
in the coming QQuickTable as well.

Change-Id: I5544b177d0ff28b2cbb76f33343808d953ec47bd
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>

1 files changed, 165 insertions, 0 deletions

diff --git a/src/quick/items/qquickitemviewfxitem.cpp b/src/quick/items/qquickitemviewfxitem.cpp
new file mode 100644
index 0000000000..f9c65967ea
--- /dev/null
+++ b/src/quick/items/qquickitemviewfxitem.cpp
@@ -0,0 +1,165 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQuick module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickitemviewfxitem_p_p.h"
+#include "qquickitem_p.h"
+#include "qquickitemview_p_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QQuickItemViewFxItem::QQuickItemViewFxItem(QQuickItem *item, bool ownItem, QQuickItemChangeListener* changeListener)
+    : item(item)
+    , ownItem(ownItem)
+    , changeListener(changeListener)
+    , transitionableItem(nullptr)
+    , releaseAfterTransition(false)
+    , trackGeom(false)
+{
+}
+
+QQuickItemViewFxItem::~QQuickItemViewFxItem()
+{
+    delete transitionableItem;
+    if (ownItem && item) {
+        trackGeometry(false);
+        item->setParentItem(0);
+        item->deleteLater();
+    }
+}
+
+qreal QQuickItemViewFxItem::itemX() const
+{
+    return transitionableItem ? transitionableItem->itemX() : (item ? item->x() : 0);
+}
+
+qreal QQuickItemViewFxItem::itemY() const
+{
+    return transitionableItem ? transitionableItem->itemY() : (item ? item->y() : 0);
+}
+
+void QQuickItemViewFxItem::moveTo(const QPointF &pos, bool immediate)
+{
+    if (transitionableItem)
+        transitionableItem->moveTo(pos, immediate);
+    else if (item)
+        item->setPosition(pos);
+}
+
+void QQuickItemViewFxItem::setVisible(bool visible)
+{
+    if (!visible && transitionableItem && transitionableItem->transitionScheduledOrRunning())
+        return;
+    if (item)
+        QQuickItemPrivate::get(item)->setCulled(!visible);
+}
+
+void QQuickItemViewFxItem::trackGeometry(bool track)
+{
+    if (track) {
+        if (!trackGeom) {
+            if (item) {
+                QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
+                itemPrivate->addItemChangeListener(changeListener, QQuickItemPrivate::Geometry);
+            }
+            trackGeom = true;
+        }
+    } else {
+        if (trackGeom) {
+            if (item) {
+                QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
+                itemPrivate->removeItemChangeListener(changeListener, QQuickItemPrivate::Geometry);
+            }
+            trackGeom = false;
+        }
+    }
+}
+
+QRectF QQuickItemViewFxItem::geometry() const
+{
+    return QRectF(item->position(), item->size());
+}
+
+void QQuickItemViewFxItem::setGeometry(const QRectF &geometry)
+{
+    item->setPosition(geometry.topLeft());
+    item->setSize(geometry.size());
+}
+
+QQuickItemViewTransitioner::TransitionType QQuickItemViewFxItem::scheduledTransitionType() const
+{
+    return transitionableItem ? transitionableItem->nextTransitionType : QQuickItemViewTransitioner::NoTransition;
+}
+
+bool QQuickItemViewFxItem::transitionScheduledOrRunning() const
+{
+    return transitionableItem ? transitionableItem->transitionScheduledOrRunning() : false;
+}
+
+bool QQuickItemViewFxItem::transitionRunning() const
+{
+    return transitionableItem ? transitionableItem->transitionRunning() : false;
+}
+
+bool QQuickItemViewFxItem::isPendingRemoval() const
+{
+    return transitionableItem ? transitionableItem->isPendingRemoval() : false;
+}
+
+void QQuickItemViewFxItem::transitionNextReposition(QQuickItemViewTransitioner *transitioner, QQuickItemViewTransitioner::TransitionType type, bool asTarget)
+{
+    if (!transitioner)
+        return;
+    if (!transitionableItem)
+        transitionableItem = new QQuickItemViewTransitionableItem(item);
+    transitioner->transitionNextReposition(transitionableItem, type, asTarget);
+}
+
+bool QQuickItemViewFxItem::prepareTransition(QQuickItemViewTransitioner *transitioner, const QRectF &viewBounds)
+{
+    return transitionableItem ? transitionableItem->prepareTransition(transitioner, index, viewBounds) : false;
+}
+
+void QQuickItemViewFxItem::startTransition(QQuickItemViewTransitioner *transitioner)
+{
+    if (transitionableItem)
+        transitionableItem->startTransition(transitioner, index);
+}
+
+QT_END_NAMESPACE
+