QmlDesigner: MCU Metadata improvements

- Introduced allowChildren switch

Task: QDS-2794

Change-Id: Ie992fb173e8eacb27b10679d5ff28238277aa346
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qmldesigner/qt4mcu/qul-14.qml

@@ -98,12 +98,14 @@ VersionData {
     }
 
     QtQuick.Image {
+        allowChildren: false
         allowedProperties: ["rotation", "scale", "transformOrigin"]
         bannedProperties: ["mirror", "mipmap",  "cache", "autoTransform", "asynchronous",
             "sourceSize", "smooth"]
     }
 
     QtQuick.Text {
+        allowChildren: false
         allowedProperties: ["rotation", "scale", "transformOrigin"]
         bannedProperties: ["elide", "lineHeight", "lineHeightMode", "wrapMode", "style",
             "styleColor", "minimumPointSize", "minimumPixelSize", "styleColor",

src/plugins/qmldesigner/components/propertyeditor/propertyeditorvalue.cpp

@@ -33,6 +33,7 @@
 #include <qmldesignerplugin.h>
 #include <qmlobjectnode.h>
 #include <designermcumanager.h>
+#include <qmlitemnode.h>
 
 #include <utils/qtcassert.h>
 
@@ -292,11 +293,19 @@ bool PropertyEditorValue::isAvailable() const
         //allowed item properties:
         const auto itemTypes = mcuAllowedItemProperties.keys();
         for (const auto &itemType : itemTypes) {
-            if (isAllowedSubclassType(itemType, m_modelNode.metaInfo())
+            if (isAllowedSubclassType(itemType, m_modelNode.metaInfo())) {
-                    && mcuAllowedItemProperties.value(itemType).contains(pureNameStr)) {
+                const QmlDesigner::DesignerMcuManager::ItemProperties allowedItemProps =
+                        mcuAllowedItemProperties.value(itemType);
+                if (allowedItemProps.properties.contains(pureNameStr)) {
+                    if (QmlDesigner::QmlItemNode::isValidQmlItemNode(m_modelNode)) {
+                        const bool itemHasChildren = QmlDesigner::QmlItemNode(m_modelNode).hasChildren();
+
+                        if (allowedItemProps.allowChildren == itemHasChildren)
                             return true;
                     }
                 }
+            }
+        }
 
         //banned properties:
         //with prefixes:

src/plugins/qmldesigner/designermcumanager.cpp

@@ -170,9 +170,16 @@ void DesignerMcuManager::readVersionData(const DesignerMcuManager::Version &vers
 
         //handling allowed properties:
         if (child->propertyNames().contains("allowedProperties")) {
-            const QStringList allowedProperties(readPropertyList("allowedProperties", child));
+            ItemProperties allowedProperties;
 
-            if (!allowedProperties.isEmpty())
+            const QVariant childrenPropertyVar = child->property("allowChildren");
+
+            if (!childrenPropertyVar.isNull() && childrenPropertyVar.isValid())
+                allowedProperties.allowChildren = childrenPropertyVar.toBool();
+
+            allowedProperties.properties = readPropertyList("allowedProperties", child);
+
+            if (!allowedProperties.properties.isEmpty())
                 m_allowedItemProperties.insert(child->name(), allowedProperties);
         }
 
@@ -235,7 +242,7 @@ QStringList DesignerMcuManager::bannedImports() const
     return m_bannedImports;
 }
 
-QHash<QString, QStringList> DesignerMcuManager::allowedItemProperties() const
+QHash<QString, DesignerMcuManager::ItemProperties> DesignerMcuManager::allowedItemProperties() const
 {
     return m_allowedItemProperties;
 }

src/plugins/qmldesigner/designermcumanager.h

@@ -43,6 +43,11 @@ public:
     };
     using VersionsList = QList<Version>;
 
+    struct ItemProperties {
+        QStringList properties;
+        bool allowChildren = true;
+    };
+
     static DesignerMcuManager& instance();
 
     static QString mcuResourcesPath();
@@ -62,7 +67,7 @@ public:
     QStringList allowedImports() const;
     QStringList bannedImports() const;
 
-    QHash<QString, QStringList> allowedItemProperties() const;
+    QHash<QString, ItemProperties> allowedItemProperties() const;
     QHash<QString, QStringList> bannedComplexProperties() const;
 
     DesignerMcuManager(DesignerMcuManager const&) = delete;
@@ -80,7 +85,7 @@ private:
     QSet<QString> m_bannedProperties;
     QStringList m_allowedImports;
     QStringList m_bannedImports;
-    QHash<QString, QStringList> m_allowedItemProperties;
+    QHash<QString, ItemProperties> m_allowedItemProperties;
     QHash<QString, QStringList> m_bannedComplexProperties;
 
     DesignerMcuManager::VersionsList m_versionsList;