QmlDesigner: Enable user material drag from content library

Fixes: QDS-13377
Change-Id: I88303f10809da132bf3f2e6e9736cd13770b5089
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Ali Kianian <ali.kianian@qt.io>
(cherry picked from commit 3c4db581a3)
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/components/contentlibrary/contentlibraryview.cpp

@@ -220,8 +220,7 @@ void ContentLibraryView::connectImporter()
             // delete instances of the bundle material that is about to be unimported
             executeInTransaction("ContentLibraryView::connectImporter", [&] {
                 ModelNode matLib = Utils3D::materialLibraryNode(this);
-                if (!matLib.isValid())
-                    return;
+                QTC_ASSERT(matLib.isValid(), return);
 
                 Utils::reverseForeach(matLib.directSubModelNodes(), [&](const ModelNode &mat) {
                     if (mat.isValid() && mat.type() == type)
@@ -342,8 +341,7 @@ void ContentLibraryView::customNotification(const AbstractView *view,
 
     if (identifier == "drop_bundle_material") {
         ModelNode matLib = Utils3D::materialLibraryNode(this);
-        if (!matLib.isValid())
-            return;
+        QTC_ASSERT(matLib.isValid(), return);
 
         m_bundleMaterialTargets = nodeList;
 
@@ -367,8 +365,7 @@ void ContentLibraryView::customNotification(const AbstractView *view,
         m_draggedBundleMaterial = nullptr;
     } else if (identifier == "drop_bundle_texture") {
         ModelNode matLib = Utils3D::materialLibraryNode(this);
-        if (!matLib.isValid())
-            return;
+        QTC_ASSERT(matLib.isValid(), return);
 
         m_widget->addTexture(m_draggedBundleTexture);
 
@@ -377,13 +374,39 @@ void ContentLibraryView::customNotification(const AbstractView *view,
         QTC_ASSERT(nodeList.size() == 1, return);
 
         auto compUtils = QmlDesignerPlugin::instance()->documentManager().generatedComponentUtils();
-        bool is3D = m_draggedBundleItem->type().startsWith(compUtils.user3DBundleType().toLatin1());
+        bool isUser3D = m_draggedBundleItem->type().startsWith(compUtils.user3DBundleType().toLatin1());
+        bool isUserMaterial = m_draggedBundleItem->type().startsWith(compUtils.userMaterialsBundleType().toLatin1());
 
         m_bundleItemPos = data.size() == 1 ? data.first() : QVariant();
-        if (is3D)
+        if (isUser3D) {
             m_widget->userModel()->addToProject(m_draggedBundleItem);
-        else
+        } else if (isUserMaterial) {
+            ModelNode matLib = Utils3D::materialLibraryNode(this);
+            QTC_ASSERT(matLib.isValid(), return);
+
+            m_bundleMaterialTargets = nodeList;
+
+            ModelNode defaultMat = getBundleMaterialDefaultInstance(m_draggedBundleItem->type());
+            if (defaultMat.isValid()) {
+                if (m_bundleMaterialTargets.isEmpty()) { // if no drop target, create a duplicate material
+                    executeInTransaction(__FUNCTION__, [&] {
+#ifdef QDS_USE_PROJECTSTORAGE
+                        Utils3D::createMaterial(this, m_draggedBundleItem->type());
+#else
+                        Utils3D::createMaterial(this, defaultMat.metaInfo());
+#endif
+                    });
+                } else {
+                    applyBundleMaterialToDropTarget(defaultMat);
+                }
+            } else {
+                m_widget->userModel()->addToProject(m_draggedBundleItem);
+            }
+
+            m_draggedBundleItem = nullptr;
+        } else {
             m_widget->effectsModel()->addInstance(m_draggedBundleItem);
+        }
         m_bundleItemTarget = nodeList.first() ? nodeList.first() : Utils3D::active3DSceneNode(this);
     } else if (identifier == "add_material_to_content_lib") {
         QTC_ASSERT(nodeList.size() == 1 && data.size() == 1, return);

src/plugins/qmldesigner/components/edit3d/edit3dview.cpp

@@ -1472,7 +1472,7 @@ void Edit3DView::dropBundleMaterial(const QPointF &pos)
     emitView3DAction(View3DActionType::GetNodeAtPos, pos);
 }
 
-void Edit3DView::dropBundleEffect(const QPointF &pos)
+void Edit3DView::dropBundleItem(const QPointF &pos)
 {
     m_nodeAtPosReqType = NodeAtPosReqType::BundleEffectDrop;
     emitView3DAction(View3DActionType::GetNodeAtPos, pos);

src/plugins/qmldesigner/components/edit3d/edit3dview.h

@@ -98,7 +98,7 @@ public:
     void showContextMenu();
     void dropMaterial(const ModelNode &matNode, const QPointF &pos);
     void dropBundleMaterial(const QPointF &pos);
-    void dropBundleEffect(const QPointF &pos);
+    void dropBundleItem(const QPointF &pos);
     void dropTexture(const ModelNode &textureNode, const QPointF &pos);
     void dropComponent(const ItemLibraryEntry &entry, const QPointF &pos);
     void dropAsset(const QString &file, const QPointF &pos);

src/plugins/qmldesigner/components/edit3d/edit3dwidget.cpp

@@ -764,7 +764,7 @@ void Edit3DWidget::dropEvent(QDropEvent *dropEvent)
 
     // handle dropping bundle items
     if (dropEvent->mimeData()->hasFormat(Constants::MIME_TYPE_BUNDLE_ITEM)) {
-        m_view->dropBundleEffect(pos);
+        m_view->dropBundleItem(pos);
         m_view->model()->endDrag();
         return;
     }