Create CMakeLists.txt and Updated Canvas Clipping added drgdropTraget to grid

Author: R3sid3ntD1023

CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.10)
+
+set(TARGET_NAME ImNodeFlow)
+find_package(imgui CONFIG REQUIRED)
+
+set(IMNODEFLOW_SOURCES
+   ${CMAKE_CURRENT_SOURCE_DIR}/src/ImNodeFlow.cpp
+)
+
+add_library(${TARGET_NAME} STATIC ${IMNODEFLOW_SOURCES})
+add_library(${TARGET_NAME}::${TARGET_NAME} ALIAS ${TARGET_NAME})
+
+target_include_directories(${TARGET_NAME} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
+target_link_libraries(${TARGET_NAME} PUBLIC imgui)
+target_compile_definitions(${TARGET_NAME} PUBLIC _CRT_SECURE_NO_WARNINGS PUBLIC IMGUI_DEFINE_MATH_OPERATORS)

include/ImNodeFlow.h

@@ -310,6 +310,8 @@ namespace ImFlow
         template<typename T, typename... Params>
         std::shared_ptr<T> addNode(const ImVec2& pos, Params&&... args);
 
+        void addNode(const ImVec2& pos, const std::shared_ptr<BaseNode>& node);
+
     private:
         /**
          * @brief <BR>Helper struct for creating a node struct from a lambda
@@ -385,6 +387,13 @@ namespace ImFlow
          */
         void rightClickPopUpContent(std::function<void(BaseNode* node)> content) { m_rightClickPopUp = std::move(content); }
 
+        /**
+         * @brief <BR>Pop-up when drag_dropping
+         * @details Sets the node pos when drag dropping a node to the grid
+         * @param content Function or Lambda containing only the pos of the mouse when clicked
+         */
+        void dragDropTarget(std::function<void(const ImVec2 &)> content) { m_dragdropTarget = std::move(content); }
+
         /**
          * @brief <BR>Get mouse clicking status
          * @return [TRUE] if mouse is clicked and click hasn't been consumed
@@ -522,6 +531,7 @@ namespace ImFlow
         ImGuiKey m_droppedLinkPupUpComboKey = ImGuiKey_None;
         Pin* m_droppedLinkLeft = nullptr;
         std::function<void(BaseNode* node)> m_rightClickPopUp;
+        std::function<void(const ImVec2 &)> m_dragdropTarget;
         BaseNode* m_hoveredNodeAux = nullptr;
 
         BaseNode* m_hoveredNode = nullptr;

src/ImNodeFlow.cpp

@@ -239,6 +239,18 @@ namespace ImFlow {
         m_links.push_back(link);
     }
 
+    void ImNodeFlow::addNode(const ImVec2& pos, const std::shared_ptr<BaseNode>& n)
+    {
+        n->setPos(pos);
+        n->setHandler(this);
+        if (!n->getStyle())
+            n->setStyle(NodeStyle::cyan());
+
+        auto uid = reinterpret_cast<uintptr_t>(n.get());
+        n->setUID(uid);
+        m_nodes[uid] = n;
+    }
+
     void ImNodeFlow::update() {
         // Updating looping stuff
         m_hovering = nullptr;
@@ -335,5 +347,13 @@ namespace ImFlow {
         m_pinRecursionBlacklist.clear();
 
         m_context.end();
+
+        if (ImGui::BeginDragDropTarget())
+		{
+			if (m_dragdropTarget)
+				m_dragdropTarget(screen2grid(ImGui::GetMousePos()));
+
+			ImGui::EndDragDropTarget();
+		}
     }
 }

src/context_wrapper.h

@@ -112,6 +112,8 @@ inline void ContainedContext::setFontDensity()
 
 inline void ContainedContext::begin()
 {
+	auto window = ImGui::GetCurrentWindow();
+	
     ImGui::PushID(this);
     ImGui::PushStyleColor(ImGuiCol_ChildBg, m_config.color);
     ImGui::BeginChild("view_port", m_config.size, 0, ImGuiWindowFlags_NoMove);
@@ -143,19 +145,31 @@ inline void ContainedContext::begin()
 
     ImGui::NewFrame();
 
-    if (!m_config.extra_window_wrapper)
-        return;
-    ImGui::SetNextWindowPos(ImVec2(0, 0), ImGuiCond_Appearing);
-    ImGui::SetNextWindowSize(ImGui::GetMainViewport()->WorkSize);
-    ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0, 0));
-    ImGui::Begin("viewport_container", nullptr, ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoBackground | ImGuiWindowFlags_NoMove
-                                                | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse);
-    setFontDensity();
-    ImGui::PopStyleVar();
+    if (m_config.extra_window_wrapper)
+    {
+	ImGui::SetNextWindowPos(ImVec2(0, 0), ImGuiCond_Appearing);
+	ImGui::SetNextWindowSize(ImGui::GetMainViewport()->WorkSize);
+	ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0, 0));
+	ImGui::Begin("viewport_container", nullptr, ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoBackground | ImGuiWindowFlags_NoMove
+							| ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse);
+	setFontDensity();
+	ImGui::PopStyleVar();
+    }
+  
+
+	auto clip_rect = window->ClipRect;
+	ImVec2 canvas_p0 = clip_rect.Min;
+	ImVec2 canvas_p1 = clip_rect.Max;
+	canvas_p0 = (canvas_p0 - m_origin) / m_scale;
+	canvas_p1 = (canvas_p1 - m_origin) / m_scale;
+	
+	ImGui::PushClipRect(canvas_p0, canvas_p1, false);
 }
 
 inline void ContainedContext::end()
 {
+    ImGui::PopClipRect();
+    
     m_anyWindowHovered = ImGui::IsWindowHovered(ImGuiHoveredFlags_AnyWindow);
     if (m_config.extra_window_wrapper && ImGui::IsWindowHovered())
         m_anyWindowHovered = false;