282 lines
11 KiB
C++
282 lines
11 KiB
C++
//
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// HierarchyPanel.cpp：实体层级树实现（UE Outliner 语义）。
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//
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// 树形展示（根 = 无有效父链接的实体，子 = HierarchyComponent 挂载序）、
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// 点击选中、拖拽改父/拖到空白区挂根（keepWorld = 挂载前后世界位姿
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// 不变）、右键 Create Child / Detach / Delete（级联随葬，延迟销毁）。
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//
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#include "HierarchyPanel.h"
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#include "AssetBrowserPanel.h" // kPrefabDragPayload（Content Browser 源）
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#include "Engine/ECS/Components.h"
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#include "Engine/ECS/EntityHandle.h" // CreateEntity 返回完整 EntityHandle
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#include "Engine/Serialization/SceneSerializer.h"
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#include "Engine/Core/Log.h"
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#include <imgui.h>
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#include <cstring>
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#include <filesystem>
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#include <string>
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#include <vector>
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using namespace Engine;
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namespace {
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// 拖拽 payload 类型名（Editor 内部约定；实体位模式 4 字节）
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constexpr const char* kHierPayload = "HIER_ENTITY";
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// 实体显示名
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std::string DisplayName(const entt::registry& reg, entt::entity e)
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{
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if (const auto* n = reg.try_get<Engine::ECS::NameComponent>(e);
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n && !n->name.empty()) {
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return n->name;
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}
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return "(unnamed)";
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}
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// Prefab 拖入实例化（树节点/空白区落点共用）。根实体挂在场景根、
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// 保留授权位姿；返回根实体（失败 entt::null）
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entt::entity InstantiatePrefabDrop(const EditorContext& ctx,
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const char* path)
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{
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if (!ctx.scene || !ctx.assets || !path) {
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return entt::null;
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}
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return Engine::Serialization::SceneSerializer::InstantiatePrefab(
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*ctx.scene, *ctx.assets, path);
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}
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// 实体名 → 合法文件名（路径分隔符/保留符净化；空名兜底）
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std::string PrefabFileName(std::string name)
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{
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for (char& c : name) {
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if (c == '/' || c == '\\' || c == ':' || c == '*' ||
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c == '?' || c == '"' || c == '<' || c == '>' ||
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c == '|') {
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c = '_';
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}
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}
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if (name.empty() || name == "(unnamed)") {
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name = "prefab";
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}
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return name;
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}
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// 递归绘制单节点（含子树）。返回值无意义，选中写 selected
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void DrawEntityNode(const EditorContext& ctx, entt::entity e,
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entt::entity& selected)
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{
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auto& reg = ctx.scene->GetRegistry();
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// 稳定行 ID（UUID）：折叠态跨帧保持 + 与 Inspector PushID 隔离
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u64 rowId = static_cast<u64>(static_cast<u32>(e));
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if (const auto* id = reg.try_get<Engine::ECS::IdComponent>(e)) {
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rowId = id->uuid.Value();
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}
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ImGui::PushID(reinterpret_cast<const void*>(rowId));
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// 子表（过滤悬空 + 无 Name 的防御性兜底）
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const auto* h = reg.try_get<Engine::ECS::HierarchyComponent>(e);
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std::vector<entt::entity> kids;
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if (h) {
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for (entt::entity c : h->children) {
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if (reg.valid(c) && reg.all_of<Engine::ECS::NameComponent>(c)) {
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kids.push_back(c);
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}
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}
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}
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const std::string label = DisplayName(reg, e);
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const ImGuiTreeNodeFlags flags =
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ImGuiTreeNodeFlags_OpenOnArrow |
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ImGuiTreeNodeFlags_SpanAvailWidth |
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(kids.empty() ? ImGuiTreeNodeFlags_Leaf : 0) |
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(selected == e ? ImGuiTreeNodeFlags_Selected : 0);
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const bool opened = ImGui::TreeNodeEx(label.c_str(), flags);
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const bool toggled = ImGui::IsItemToggledOpen();
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if (ImGui::IsItemClicked(ImGuiMouseButton_Left) && !toggled) {
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selected = e;
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}
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// ---- 拖拽源：拖动本实体去改父 ----
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if (ImGui::BeginDragDropSource()) {
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const u32 bits = static_cast<u32>(entt::to_integral(e));
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ImGui::SetDragDropPayload(kHierPayload, &bits, sizeof(bits));
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ImGui::TextUnformatted(label.c_str());
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ImGui::EndDragDropSource();
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}
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// ---- 拖放目标：挂到本实体下（keepWorld，世界位姿不变）；
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// Prefab 拖入 = 实例化子树后挂到本实体下（keepWorld 保持
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// 授权世界位姿）----
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if (ImGui::BeginDragDropTarget()) {
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if (const ImGuiPayload* pl =
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ImGui::AcceptDragDropPayload(kHierPayload)) {
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u32 bits = 0;
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std::memcpy(&bits, pl->Data, sizeof(bits));
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const entt::entity dragged = static_cast<entt::entity>(bits);
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// 拒挂自身/自身后代（SetParent 内部同样防环，这里提前
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// 静默拦截，避免"看起来挂上了"的错觉）
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if (dragged != e && !ctx.scene->IsDescendantOf(dragged, e)) {
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ctx.scene->SetParent(dragged, e);
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}
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}
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if (const ImGuiPayload* pl =
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ImGui::AcceptDragDropPayload(kPrefabDragPayload)) {
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if (const entt::entity root =
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InstantiatePrefabDrop(ctx,
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static_cast<const char*>(
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pl->Data));
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root != entt::null) {
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ctx.scene->SetParent(root, e); // keepWorld 默认 true
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selected = root;
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}
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}
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ImGui::EndDragDropTarget();
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}
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// ---- 右键菜单 ----
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if (ImGui::BeginPopupContextItem("hier_ctx")) {
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if (ImGui::MenuItem("Create Child")) {
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// keepWorld=true：新实体出现在父的位置（UE attach 语义）
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const auto child = ctx.scene->CreateEntity("child entity");
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ctx.scene->SetParent(child, e);
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selected = child;
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}
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if (ImGui::MenuItem("Save As Prefab")) {
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// 固定目录 + 实体名派生文件名（无文件对话框库，与场景
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// File 菜单同策略；重名覆盖，改名走文件系统）
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const std::string path =
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"assets/prefabs/" +
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PrefabFileName(DisplayName(reg, e)) + ".prefab";
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std::error_code ec;
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std::filesystem::create_directories("assets/prefabs", ec);
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if (Serialization::SceneSerializer::SerializePrefab(
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*ctx.scene, *ctx.assets, e, path)) {
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ENGINE_INFO("Hierarchy: prefab saved to '{}'", path);
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}
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}
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if (ctx.scene->GetParent(e) != entt::null &&
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ImGui::MenuItem("Detach to Root")) {
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ctx.scene->SetParent(e, entt::null);
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}
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if (ImGui::MenuItem("Delete")) {
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// 级联随葬：选中若是被删子树的一部分，一并清除
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const bool selInSubtree = ctx.scene->IsDescendantOf(selected, e);
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ctx.scene->DestroyEntity(e);
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if (selInSubtree) {
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selected = entt::null;
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}
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}
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ImGui::EndPopup();
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}
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// ---- 组件徽标（与行内同级显示）----
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std::string badge;
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if (reg.all_of<Engine::ECS::MeshRendererComponent>(e)) badge += "[M]";
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if (reg.all_of<Engine::ECS::AnimationComponent>(e)) badge += "[A]";
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if (reg.all_of<Engine::ECS::CameraComponent>(e)) badge += "[C]";
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if (reg.all_of<Engine::ECS::LightComponent>(e)) badge += "[L]";
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if (reg.all_of<Engine::ECS::RigidBodyComponent>(e)) badge += "[P]";
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if (!badge.empty()) {
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ImGui::SameLine();
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ImGui::TextDisabled("%s", badge.c_str());
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if (ImGui::IsItemHovered()) {
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ImGui::SetTooltip(
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"M=Mesh A=Animation C=Camera L=Light P=Physics");
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}
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}
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if (opened) {
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for (entt::entity c : kids) {
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DrawEntityNode(ctx, c, selected);
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}
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ImGui::TreePop();
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}
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ImGui::PopID();
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}
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} // namespace
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void HierarchyPanel::Draw(const EditorContext& ctx, entt::entity& selected)
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{
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ImGui::Begin("Outliner");
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// 工具栏：创建实体（在遍历之前，不修改遍历中的注册表结构）。
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// Place Actors 简化语义：常用类型一键带组件，其余 Add Component 补
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if (ImGui::Button("+ Create"))
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{
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ImGui::OpenPopup("create_entity");
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}
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if (ImGui::BeginPopup("create_entity"))
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{
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if (ImGui::MenuItem("Empty"))
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{
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selected = ctx.scene->CreateEntity("Entity");
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}
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if (ImGui::MenuItem("Light"))
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{
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auto e = ctx.scene->CreateEntity("Light");
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e.AddComponent<Engine::ECS::LightComponent>();
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selected = e;
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}
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if (ImGui::MenuItem("Camera"))
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{
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auto e = ctx.scene->CreateEntity("Camera");
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e.AddComponent<Engine::ECS::CameraComponent>();
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selected = e;
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}
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if (ImGui::MenuItem("Environment"))
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{
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// UE 新关卡环境集简化：Skybox（背景）+ SkyLight（环境光）一体
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auto e = ctx.scene->CreateEntity("Environment");
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e.AddComponent<Engine::ECS::SkyboxComponent>();
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e.AddComponent<Engine::ECS::SkyLightComponent>();
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selected = e;
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}
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ImGui::EndPopup();
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}
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ImGui::Separator();
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auto& reg = ctx.scene->GetRegistry();
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// 树形遍历：根 = 无有效父链接的实体（creation 序），子按挂载序递归
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reg.view<Engine::ECS::NameComponent>().each(
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[&](const entt::entity e, const Engine::ECS::NameComponent&)
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{
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if (ctx.scene->GetParent(e) != entt::null) return; // 非根
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DrawEntityNode(ctx, e, selected);
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});
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// ---- 空白区 = 挂根落点（UE Outliner 拖到空白 = 顶层）；
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// Prefab 拖入 = 实例化到场景根（授权位姿）----
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ImVec2 rem = ImGui::GetContentRegionAvail();
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if (rem.y > 4.0f) {
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ImGui::InvisibleButton("##hier_drop_root", rem);
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if (ImGui::BeginDragDropTarget()) {
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if (const ImGuiPayload* pl =
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ImGui::AcceptDragDropPayload(kHierPayload)) {
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u32 bits = 0;
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std::memcpy(&bits, pl->Data, sizeof(bits));
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ctx.scene->SetParent(static_cast<entt::entity>(bits),
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entt::null);
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}
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if (const ImGuiPayload* pl =
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ImGui::AcceptDragDropPayload(kPrefabDragPayload)) {
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if (const entt::entity root = InstantiatePrefabDrop(
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ctx, static_cast<const char*>(pl->Data));
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root != entt::null) {
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selected = root;
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}
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}
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ImGui::EndDragDropTarget();
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}
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}
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ImGui::End();
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}
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