Move everything under the guecs/ directory in src/ so that it meshes better with other projects.

include/guecs/ui.hpp

@@ -0,0 +1,253 @@
+#pragma once
+#include "guecs/dbc.hpp"
+#include "guecs/lel.hpp"
+#include <string>
+#include <memory>
+#include <functional>
+#include <any>
+#include <queue>
+#include <typeindex>
+#include <unordered_map>
+#include "guecs/sfml/components.hpp"
+
+namespace guecs {
+  using std::shared_ptr, std::wstring, std::string;
+
+  using Entity = unsigned long;
+
+  using EntityMap = std::unordered_map<Entity, size_t>;
+
+  template <typename T>
+    struct ComponentStorage {
+      std::vector<T> data;
+      std::queue<size_t> free_indices;
+    };
+
+  struct Clickable {
+    /* This is actually called by UI::mouse and passed the entity ID of the
+     * button pressed so you can interact with it in the event handler.
+     */
+    std::function<void(Entity ent, std::any data)> action;
+  };
+
+  struct ActionData {
+    std::any data;
+  };
+
+  struct CellName {
+    string name;
+  };
+
+  struct SpriteTexture {
+    std::shared_ptr<sf::Sprite> sprite = nullptr;
+    std::shared_ptr<sf::Texture> texture = nullptr;
+  };
+
+  class Backend {
+    public:
+    virtual SpriteTexture texture_get(const string& name) = 0;
+
+    virtual void sound_play(const string& name) = 0;
+
+    virtual void sound_stop(const string& name) = 0;
+
+    virtual std::shared_ptr<sf::Shader> shader_get(const std::string& name) = 0;
+
+    virtual bool shader_updated() = 0;
+  };
+
+  void init(Backend* backend);
+
+  class UI {
+    public:
+      Entity MAIN = 0;
+      unsigned long entity_count = 1;
+      std::unordered_map<std::type_index, EntityMap> $components;
+      std::unordered_map<std::type_index, std::any> $component_storages;
+      std::unordered_map<string, Entity> $name_ents;
+      shared_ptr<sf::Font> $font = nullptr;
+      lel::Parser $parser;
+      string $grid = "";
+
+      UI();
+
+      void position(int x, int y, int width, int height);
+      sf::Vector2f get_position();
+      sf::Vector2f get_size();
+      void layout(const string& grid);
+      Entity init_entity(const string& name);
+      Entity entity(const string& name);
+      Entity entity(const string& name, int id);
+
+      inline lel::CellMap& cells() {
+        return $parser.cells;
+      }
+
+      void init();
+      void render(sf::RenderWindow& window);
+      bool mouse(float x, float y, bool hover);
+      void click_on(const string& name, bool required=false);
+      void click_on(Entity slot_id);
+      void debug_layout(sf::RenderWindow& window);
+
+      Entity entity() { return ++entity_count; }
+
+      template <typename Comp>
+        size_t make_component() {
+          auto &storage = component_storage_for<Comp>();
+          size_t index;
+
+          if(!storage.free_indices.empty()) {
+            index = storage.free_indices.front();
+            storage.free_indices.pop();
+          } else {
+            storage.data.emplace_back();
+            index = storage.data.size() - 1;
+          }
+
+          return index;
+        }
+
+      template <typename Comp>
+        ComponentStorage<Comp> &component_storage_for() {
+          auto type_index = std::type_index(typeid(Comp));
+          $component_storages.try_emplace(type_index, ComponentStorage<Comp>{});
+          return std::any_cast<ComponentStorage<Comp> &>(
+              $component_storages.at(type_index));
+        }
+
+      template <typename Comp>
+        EntityMap &entity_map_for() {
+          return $components[std::type_index(typeid(Comp))];
+        }
+
+      template <typename Comp>
+        void set(Entity ent, Comp val) {
+          EntityMap &map = entity_map_for<Comp>();
+
+          if(has<Comp>(ent)) {
+            get<Comp>(ent) = val;
+            return;
+          }
+
+          map.insert_or_assign(ent, make_component<Comp>());
+          get<Comp>(ent) = val;
+        }
+
+      template <typename Comp>
+        Comp& get(Entity ent) {
+          EntityMap &map = entity_map_for<Comp>();
+          auto &storage = component_storage_for<Comp>();
+          auto index = map.at(ent);
+          return storage.data[index];
+        }
+
+      template <typename Comp>
+        Comp* get_if(Entity entity) {
+          EntityMap &map = entity_map_for<Comp>();
+          auto &storage = component_storage_for<Comp>();
+          if(map.contains(entity)) {
+            auto index = map.at(entity);
+            return &storage.data[index];
+          } else {
+            return nullptr;
+          }
+        }
+
+      template <typename Comp>
+        bool has(Entity ent) {
+          EntityMap &map = entity_map_for<Comp>();
+          return map.contains(ent);
+        }
+
+      template <typename Comp>
+        void remove(Entity ent) {
+          EntityMap &map = entity_map_for<Comp>();
+
+          if(map.contains(ent)) {
+            size_t index = map.at(ent);
+            component_storage_for<Comp>().free_indices.push(index);
+          }
+
+          map.erase(ent);
+        }
+
+      template <typename Comp>
+        void query(std::function<void(Entity, Comp &)> cb) {
+          EntityMap &map = entity_map_for<Comp>();
+
+          for(auto &[entity, index] : map) {
+            cb(entity, get<Comp>(entity));
+          }
+        }
+
+      template <typename CompA, typename CompB>
+        void query(std::function<void(Entity, CompA &, CompB &)> cb) {
+          EntityMap &map_a = entity_map_for<CompA>();
+          EntityMap &map_b = entity_map_for<CompB>();
+
+          for(auto &[entity, index_a] : map_a) {
+            if(map_b.contains(entity)) {
+              cb(entity, get<CompA>(entity), get<CompB>(entity));
+            }
+          }
+        }
+
+      template <typename Comp>
+        void set_init(Entity ent, Comp val) {
+          dbc::check(has<lel::Cell>(ent),"WRONG! slot is missing its cell?!");
+          auto& cell = get<lel::Cell>(ent);
+          val.init(cell);
+          set<Comp>(ent, val);
+        }
+
+      template <typename Comp>
+        void do_if(Entity ent, std::function<void(Comp &)> cb) {
+          if(has<Comp>(ent)) {
+            cb(get<Comp>(ent));
+          }
+        }
+
+      lel::Cell& cell_for(Entity ent) {
+        return get<lel::Cell>(ent);
+      }
+
+      lel::Cell& cell_for(const string& name) {
+        Entity ent = entity(name);
+        return get<lel::Cell>(ent);
+      }
+
+      // BUG: close could just be remove with overload
+      template <typename Comp>
+        void close(string region) {
+          auto ent = entity(region);
+          if(has<Comp>(ent)) {
+            remove<Comp>(ent);
+          }
+        }
+
+      template<typename T>
+        void render_helper(sf::RenderWindow& window, Entity ent, bool is_shape, T& target) {
+          sf::Shader *shader_ptr = nullptr;
+
+          if(auto shader = get_if<Effect>(ent)) {
+            if(shader->$active && !is_shape) {
+              auto ptr = shader->checkout_ptr();
+              ptr->setUniform("is_shape", is_shape);
+              // NOTE: this is needed because SFML doesn't handle shared_ptr
+              shader_ptr = ptr.get();
+            }
+          }
+
+          window.draw(*target, shader_ptr);
+        }
+
+      void show_sprite(const string& region, const string& sprite_name);
+      void show_text(const string& region, const wstring& content);
+      void show_label(const string& region, const wstring& content);
+  };
+
+
+  wstring to_wstring(const string& str);
+
+}