ECS with entt

2026-02-17 00:50:43 +01:00
parent 86392e0790
commit d4c420d5b4
30 changed files with 1314 additions and 222 deletions
--- a/editor/src/panels/scene_hierarchy.cpp
+++ b/editor/src/panels/scene_hierarchy.cpp
@@ -0,0 +1,150 @@
+#include "open_engine/scene/components.hpp"
+#include <cstdint>
+#include <cstring>
+#include <panels/scene_hierarchy.hpp>
+
+#include <imgui.h>
+
+namespace OpenEngine {
+    SceneHierarchy::SceneHierarchy(const Ref<Scene>& scene)
+        : scene(scene)
+    {
+    }
+
+    void SceneHierarchy::SetContext(const Ref<Scene>& context)
+    {
+        scene = context;
+    }
+
+    void SceneHierarchy::OnImGuiRender()
+    {
+        ImGui::Begin("Scene");
+
+        for (auto entity_entt : scene->GetRegistry().view<TagComponent>()) {
+            Entity entity{ entity_entt, scene.get() };
+
+            DrawEntityNode(entity);
+        }
+
+        if ((ImGui::IsMouseDown(0) && ImGui::IsWindowHovered())
+                || (ImGui::IsKeyDown(ImGuiKey_Escape) && ImGui::IsWindowHovered()))
+        {
+            selected_context = {};
+            renamed_entity = {};
+        }
+
+        if (ImGui::BeginPopupContextWindow(0, ImGuiPopupFlags_MouseButtonRight | ImGuiPopupFlags_NoOpenOverItems))
+        {
+            if (ImGui::MenuItem("Create Empty Entity"))
+            {
+                scene->CreateEntity("Empty entity");
+            }
+            ImGui::EndPopup();
+        }
+
+        ImGui::End();
+
+        ImGui::Begin("Properties");
+
+        if (selected_context) {
+            DrawComponents(selected_context);
+
+            if (ImGui::BeginPopupContextWindow(0, ImGuiPopupFlags_MouseButtonRight | ImGuiPopupFlags_NoOpenOverItems))
+            {
+                if (ImGui::MenuItem("Add transform"))
+                {
+                    selected_context.AddComponents<TransformComponent>();
+                }
+                if (ImGui::MenuItem("Add Sprite"))
+                {
+                    selected_context.AddComponents<SpriteRendererComponent>();
+                }
+                if (ImGui::MenuItem("Add camera"))
+                {
+                    selected_context.AddComponents<CameraComponent>();
+                }
+                ImGui::EndPopup();
+            }
+        }
+
+        ImGui::End();
+    }
+
+    void SceneHierarchy::DrawEntityNode(Entity& entity)
+    {
+        auto& tag = entity.GetComponents<TagComponent>().tag;
+
+        if (renamed_entity == entity && selected_context == entity) {
+            char buffer[255];
+            std::memset(buffer, 0, sizeof(buffer));
+            std::strncpy(buffer, tag.c_str(), sizeof(buffer));
+
+            ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(2, 2));
+            ImGui::SetKeyboardFocusHere();
+
+            ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
+
+            if (ImGui::InputText("##tagEditor", buffer, sizeof(buffer), ImGuiInputTextFlags_EnterReturnsTrue | ImGuiInputTextFlags_AutoSelectAll)
+                    || (!ImGui::IsItemActive() && ImGui::IsMouseClicked(0))) {
+                tag = buffer;
+                renamed_entity = {};
+            }
+
+            if (ImGui::IsKeyPressed(ImGuiKey_Escape))
+                renamed_entity = {};
+
+            ImGui::PopStyleVar();
+
+        } else {
+            ImGuiTreeNodeFlags flags = ((selected_context == entity) ? ImGuiTreeNodeFlags_Selected : 0) | ImGuiTreeNodeFlags_OpenOnArrow;
+            flags |= ImGuiTreeNodeFlags_SpanAvailWidth;
+
+            bool opened = ImGui::TreeNodeEx((void*)(uint64_t)(uint32_t)entity, flags, "%s", tag.c_str());
+
+            if (ImGui::IsItemHovered() && ImGui::IsMouseDoubleClicked(ImGuiMouseButton_Left)) {
+                // FocusViewportOnEntity(entity); // future implementation
+                renamed_entity = {};
+            } else if (ImGui::IsItemClicked()) {
+
+                double current_time = ImGui::GetTime();
+                double double_click_time = ImGui::GetIO().MouseDoubleClickTime; // Usually ~0.3s
+
+                if (selected_context == entity) {
+                    renamed_entity = entity;
+                    if (current_time - last_selected_time > double_click_time)
+                    {
+                        renamed_entity = entity;
+                    }
+                } else {
+                    // First time selecting
+                    selected_context = entity;
+                    last_selected_time = current_time;
+                }
+            }
+
+            if (opened)
+                ImGui::TreePop();
+        }
+    }
+
+    void SceneHierarchy::DrawComponents(Entity& entity)
+    {
+        if (entity.HasComponent<TagComponent>())
+            entity.GetComponents<TagComponent>().OnImGuiRender(entity);
+
+        DrawComponentDrawer<TransformComponent>(entity, "Transform");
+        DrawComponentDrawer<SpriteRendererComponent>(entity, "Sprite");
+        DrawComponentDrawer<CameraComponent>(entity, "Camera");
+    }
+}
+
+/*
+    if (ImGui::BeginPopupContextWindow(0, ImGuiPopupFlags_MouseButtonRight | ImGuiPopupFlags_NoOpenOverItems))
+    {
+        if (ImGui::MenuItem("Create Empty Entity"))
+        {
+            // m_Context->CreateEntity("Empty Entity");
+        }
+        ImGui::EndPopup();
+    }
+ */