add command

doric-Qt/example/doric/plugin/DoricShaderPlugin.cpp

@@ -34,3 +34,7 @@ void DoricShaderPlugin::render(QString jsValueString, QString callbackId) {
       },
       DoricThreadMode::UI);
 }
+
+void DoricShaderPlugin::command(QString jsValueString, QString callbackId) {
+  qCritical() << "command: " << jsValueString << " " << callbackId;
+}

doric-Qt/example/doric/plugin/DoricShaderPlugin.h

@@ -11,6 +11,8 @@ public:
   using DoricNativePlugin::DoricNativePlugin;
 
   Q_INVOKABLE void render(QString jsValueString, QString callbackId);
+
+  Q_INVOKABLE void command(QString jsValueString, QString callbackId);
 };
 
 #endif // SHADERPLUGIN_H

doric-Qt/example/doric/shader/slider/DoricSliderNode.cpp

@@ -25,6 +25,7 @@ DoricViewNode *DoricSliderNode::getSubNodeById(QString id) {
       return childNodes.at(i);
     }
   }
+  return nullptr;
 }
 
 void DoricSliderNode::blendSubNode(QJsonValue subProperties) {