ImGUIEXT addRenderLoop support global without any target scene

extensions/ImGuiEXT/CCImGuiEXT.cpp

@@ -10,26 +10,27 @@ static uint32_t fourccValue(const std::string& str) {
     return value;
 }
 
-// TODO: Rename to ImGuiEXTLayerBlock
-// Because it's only used for block event when ImGui::IsAnyWindowHovered() == 'true'
-class ImGuiEXTRenderer : public Layer
-{
-CC_CONSTRUCTOR_ACCESS:
-    bool initWithImGuiEXT()
-	{
-		if (!Layer::init())
-			return false;
+class ImGuiEXTEventTracker {
+public:
+    virtual ~ImGuiEXTEventTracker() {}
+};
 
+// Track scene event and check whether routed to the scene graph
+class ImGuiEXTSceneEventTracker : public ImGuiEXTEventTracker
+{
+public:
+    bool initWithScene(Scene* scene)
+    {
 #ifdef CC_PLATFORM_PC
+        _trackLayer = utils::newInstance<Layer>();
+
         // note: when at the first click to focus the window, this will not take effect
         auto listener = EventListenerTouchOneByOne::create();
         listener->setSwallowTouches(true);
         listener->onTouchBegan = [this](Touch* touch, Event*) -> bool {
-			if (!_visible)
-				return false;
             return ImGui::IsAnyWindowHovered();
         };
-		_eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
+        _trackLayer->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener, _trackLayer);
 
         // add by halx99
         auto stopAnyMouse = [=](EventMouse* event) {
@@ -39,7 +40,8 @@ CC_CONSTRUCTOR_ACCESS:
         };
         auto mouseListener = EventListenerMouse::create();
         mouseListener->onMouseDown = mouseListener->onMouseUp = stopAnyMouse;
-		_eventDispatcher->addEventListenerWithSceneGraphPriority(mouseListener, this);
+        _trackLayer->getEventDispatcher()->addEventListenerWithSceneGraphPriority(mouseListener, _trackLayer);
+        scene->addChild(_trackLayer, INT_MAX);
 #endif
         // add an empty sprite to avoid render problem
         // const auto sp = Sprite::create();
@@ -55,12 +57,69 @@ CC_CONSTRUCTOR_ACCESS:
         *    And need modify engine code to call _scheduler->update(_deltaTime) even director is paused, pass 0 for update
         * c. Director::EVENT_BEFORE_DRAW call beginFrame, EVENT_AFTER_VISIT call endFrame
         */
+
         return true;
     }
 
-	~ImGuiEXTRenderer() 
+    ~ImGuiEXTSceneEventTracker()
     {
+#ifdef CC_PLATFORM_PC
+        if (_trackLayer) {
+            if (_trackLayer->getParent())
+                _trackLayer->removeFromParent();
+            _trackLayer->release();
         }
+#endif
+    }
+
+private:
+    Layer* _trackLayer = nullptr;
+};
+
+class ImGuiEXTGlobalEventTracker : public ImGuiEXTEventTracker
+{
+    static const int highestPriority = (std::numeric_limits<int>::min)();
+public:
+    bool init()
+    {
+#ifdef CC_PLATFORM_PC
+        // note: when at the first click to focus the window, this will not take effect
+
+        auto eventDispatcher = Director::getInstance()->getEventDispatcher();
+
+        _touchListener = utils::newInstance<EventListenerTouchOneByOne>();
+        _touchListener->setSwallowTouches(true);
+        _touchListener->onTouchBegan = [this](Touch* touch, Event*) -> bool {
+            return ImGui::IsAnyWindowHovered();
+        };
+        eventDispatcher->addEventListenerWithFixedPriority(_touchListener, highestPriority);
+
+        // add by halx99
+        auto stopAnyMouse = [=](EventMouse* event) {
+            if (ImGui::IsAnyWindowHovered()) {
+                event->stopPropagation();
+            }
+        };
+        _mouseListener = utils::newInstance<EventListenerMouse>();
+        _mouseListener->onMouseDown = _mouseListener->onMouseUp = stopAnyMouse;
+        eventDispatcher->addEventListenerWithFixedPriority(_mouseListener, highestPriority);
+#endif
+        return true;
+    }
+
+    ~ImGuiEXTGlobalEventTracker() {
+#ifdef CC_PLATFORM_PC
+        auto eventDispatcher = Director::getInstance()->getEventDispatcher();
+        eventDispatcher->removeEventListener(_mouseListener);
+        eventDispatcher->removeEventListener(_touchListener);
+
+        _mouseListener->release();
+        _touchListener->release();
+#endif
+    }
+
+    EventListenerTouchOneByOne* _touchListener = nullptr;
+    EventListenerMouse* _mouseListener = nullptr;
 };
 
 static ImGuiEXT* _instance = nullptr;
@@ -194,7 +253,7 @@ void ImGuiEXT::update()
     // commands will be processed after update
 }
 
-bool ImGuiEXT::addRenderLoop(const std::string& id, Scene* scene, std::function<void()> onFrame)
+bool ImGuiEXT::addRenderLoop(const std::string& id, std::function<void()> func, Scene* target)
 {
     // TODO: check whether exist
     auto fourccId = fourccValue(id);
@@ -203,22 +262,26 @@ bool ImGuiEXT::addRenderLoop(const std::string& id, Scene* scene, std::function<
         return false;
     }
 
-	auto renderer = utils::newInstance<ImGuiEXTRenderer>(&ImGuiEXTRenderer::initWithImGuiEXT);
-	scene->addChild(renderer, INT_MAX, fourccId);
-	_renderPiplines.emplace(fourccId, RenderPipline{ renderer, std::move(onFrame) });
+    ImGuiEXTEventTracker* tracker;
+    if (target)
+        tracker = utils::newInstance<ImGuiEXTSceneEventTracker>(&ImGuiEXTSceneEventTracker::initWithScene, target);
+    else
+        tracker = utils::newInstance<ImGuiEXTGlobalEventTracker>();
 
+    if (tracker) {
+        _renderPiplines.emplace(fourccId, RenderPipline{ tracker, std::move(func) });
         return true;
     }
+    return false;
+}
 
 void ImGuiEXT::removeRenderLoop(const std::string& id)
 {
     auto fourccId = fourccValue(id);
     const auto iter = _renderPiplines.find(fourccId);
     if (iter != _renderPiplines.end()) {
-		 auto renderer = iter->second.renderer;
-		 if (renderer->getParent())
-			 renderer->removeFromParent();
-		 renderer->release();
+        auto tracker = iter->second.tracker;
+        delete tracker;
         _renderPiplines.erase(iter);
     }
 }

extensions/ImGuiEXT/CCImGuiEXT.h

@@ -10,7 +10,7 @@
 
 NS_CC_EXT_BEGIN
 
-class ImGuiEXTRenderer;
+class ImGuiEXTEventTracker;
 class ImGuiEXT
 {
     friend class ImGuiEXTRenderer;
@@ -52,9 +52,9 @@ public:
     /// Add a ImGui render loop to specific scene
     /// </summary>
     /// <param name="id">The FOURCC id of render loop, starts with '#', such as "#abcd"</id>
-	/// <param name="target">the target scene to render ImGui</param>
     /// <param name="func">the ImGui render loop</param>
-	bool addRenderLoop(const std::string& id, Scene* target, std::function<void()> func);
+    /// <param name="target">The target scene to track event, nullptr for global, useful for global GM tools</param>
+    bool addRenderLoop(const std::string& id, std::function<void()> func, Scene* target);
 
     /// <summary>
     /// Remove ImGui render loop
@@ -137,7 +137,7 @@ private:
     static std::function<void(ImGuiEXT*)> _onInit;
 
     struct RenderPipline {
-		ImGuiEXTRenderer* renderer;
+        ImGuiEXTEventTracker* tracker;
         std::function<void()> frame;
     };