Add backend nodes for the blend nodes

Also adds a ClipBlendNode manager in the backend to have polymorphism and a
proper tree structure

Change-Id: I64e03d4d31acece6d924e15ec8b3b7565e14168c
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 167 insertions, 0 deletions

diff --git a/src/animation/backend/clipblendnode.cpp b/src/animation/backend/clipblendnode.cpp
new file mode 100644
index 000000000..cd2c1701f
--- /dev/null
+++ b/src/animation/backend/clipblendnode.cpp
@@ -0,0 +1,167 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "clipblendnode_p.h"
+#include <Qt3DAnimation/qclipblendnodecreatedchange.h>
+#include <Qt3DAnimation/qanimationclip.h>
+#include <Qt3DAnimation/private/managers_p.h>
+#include <Qt3DCore/qpropertynoderemovedchange.h>
+#include <Qt3DCore/qpropertynodeaddedchange.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3DAnimation {
+
+namespace Animation {
+
+ClipBlendNode::ClipBlendNode(BlendType blendType)
+    : m_manager(nullptr)
+    , m_blendType(blendType)
+{
+}
+
+ClipBlendNode::~ClipBlendNode()
+{
+}
+
+Qt3DCore::QNodeId ClipBlendNode::parentId() const
+{
+    return m_parentId;
+}
+
+Qt3DCore::QNodeIdVector ClipBlendNode::childrenIds() const
+{
+    return m_childrenIds;
+}
+
+Qt3DCore::QNodeIdVector ClipBlendNode::clipIds() const
+{
+    return m_clipIds;
+}
+
+void ClipBlendNode::sceneChangeEvent(const Qt3DCore::QSceneChangePtr &e)
+{
+    switch (e->type()) {
+
+    case Qt3DCore::PropertyValueAdded: {
+       Qt3DCore::QPropertyNodeAddedChangePtr change = qSharedPointerCast<Qt3DCore::QPropertyNodeAddedChange>(e);
+        if (change->metaObject()->inherits(&QAbstractClipBlendNode::staticMetaObject))
+            addChildId(change->addedNodeId());
+        else if (change->metaObject()->inherits(&QAnimationClip::staticMetaObject))
+            m_clipIds.push_back(change->addedNodeId());
+        break;
+    }
+
+    case Qt3DCore::PropertyValueRemoved: {
+        Qt3DCore::QPropertyNodeRemovedChangePtr change = qSharedPointerCast<Qt3DCore::QPropertyNodeRemovedChange>(e);
+        if (change->metaObject()->inherits(&QAbstractClipBlendNode::staticMetaObject))
+            removeChildId(change->removedNodeId());
+        else if (change->metaObject()->inherits(&QAnimationClip::staticMetaObject))
+            m_clipIds.removeOne(change->removedNodeId());
+        break;
+    }
+
+    default:
+        break;
+    }
+
+    Qt3DCore::QBackendNode::sceneChangeEvent(e);
+}
+
+void ClipBlendNode::setClipBlendNodeManager(ClipBlendNodeManager *manager)
+{
+    m_manager = manager;
+}
+
+ClipBlendNodeManager *ClipBlendNode::clipBlendNodeManager() const
+{
+    return m_manager;
+}
+
+void ClipBlendNode::initializeFromPeer(const Qt3DCore::QNodeCreatedChangeBasePtr &change)
+{
+    const auto creationChange = qSharedPointerCast<QClipBlendNodeCreatedChangeBase>(change);
+    setParentId(creationChange->parentClipBlendNodeId());
+    m_clipIds = creationChange->clips();
+}
+
+void ClipBlendNode::setParentId(Qt3DCore::QNodeId parentId)
+{
+    if (parentId != m_parentId) {
+        // We already had a parent, tell it to abandon us
+        if (!m_parentId.isNull()) {
+            ClipBlendNode *parent = m_manager->lookupNode(m_parentId);
+            if (parent != nullptr)
+                parent->m_childrenIds.removeAll(peerId());
+        }
+        m_parentId = parentId;
+        ClipBlendNode *parent = m_manager->lookupNode(m_parentId);
+        if (parent != nullptr && !parent->m_childrenIds.contains(peerId()))
+            parent->m_childrenIds.append(peerId());
+    }
+}
+
+void ClipBlendNode::addChildId(Qt3DCore::QNodeId childId)
+{
+    if (!m_childrenIds.contains(childId)) {
+        ClipBlendNode *child = m_manager->lookupNode(childId);
+        if (child != nullptr) {
+            m_childrenIds.push_back(childId);
+            child->m_parentId = peerId();
+        }
+    }
+}
+
+void ClipBlendNode::removeChildId(Qt3DCore::QNodeId childId)
+{
+    if (m_childrenIds.contains(childId)) {
+        ClipBlendNode *child = m_manager->lookupNode(childId);
+        if (child != nullptr)
+            child->m_parentId = Qt3DCore::QNodeId();
+        m_childrenIds.removeAll(childId);
+    }
+}
+
+ClipBlendNode::BlendType Animation::ClipBlendNode::blendType() const
+{
+    return m_blendType;
+}
+
+} // Animation
+
+} // Qt3DAnimation
+
+QT_END_NAMESPACE