added in clapping rect and node emplacement from Fattorino#53

Author: 0x0015

include/ImNodeFlow.h

@@ -356,6 +356,7 @@ namespace ImFlow
          */
         template<typename T, typename... Params>
         std::shared_ptr<T> addNode(const ImVec2& pos, Params&&... args);
+	void emplaceNode(const ImVec2& pos, const std::shared_ptr<BaseNode>& node);
 
 	std::function<void(std::shared_ptr<BaseNode>)> onNodeCreateHook = {};
 	std::function<void(const BaseNode*)> onNodeDestroyHook = {};

src/ImNodeFlow.cpp

@@ -101,6 +101,17 @@ namespace ImFlow {
         return -1;
     }
 
+    void ImNodeFlow::emplaceNode(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 Link::update() {
         // start/end from pinPoint() are in screen coordinates - convert to grid
         ImVec2 startScreen = m_left->pinPoint();

src/context_wrapper.h

@@ -114,6 +114,8 @@ 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);
@@ -154,10 +156,20 @@ inline void ContainedContext::begin()
                                                 | 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;