esengine/source/src/ECS/Utils/ComponentList.ts

///<reference path="../Components/IUpdatable.ts" />
module es {
    export class ComponentList {
        /**
         * 组件列表的全局updateOrder排序
         */
        public static compareUpdatableOrder: IUpdatableComparer = new IUpdatableComparer();
        public _entity: Entity;

        /**
         * 添加到实体的组件列表
         */
        public _components: Component[] = [];
        /**
         * 所有需要更新的组件列表
         */
        public _updatableComponents: IUpdatable[] = [];
        /**
         * 添加到此框架的组件列表。用来对组件进行分组，这样我们就可以同时进行加工
         */
        public _componentsToAdd: Component[] = [];
        /**
         * 标记要删除此框架的组件列表。用来对组件进行分组，这样我们就可以同时进行加工
         */
        public _componentsToRemove: Component[] = [];
        public _tempBufferList: Component[] = [];
        /**
         * 用于确定是否需要对该框架中的组件进行排序的标志
         */
        public _isComponentListUnsorted: boolean;

        constructor(entity: Entity) {
            this._entity = entity;
        }

        public get count() {
            return this._components.length;
        }

        public get buffer() {
            return this._components;
        }

        public markEntityListUnsorted() {
            this._isComponentListUnsorted = true;
        }

        public add(component: Component) {
            this._componentsToAdd.push(component);
        }

        public remove(component: Component) {
            let componentToRemove = new es.List(this._componentsToRemove);
            let componentToAdd = new es.List(this._componentsToAdd);
            Debug.warnIf(componentToRemove.contains(component), `您正在尝试删除一个您已经删除的组件(${component})`);

            // 这可能不是一个活动的组件，所以我们必须注意它是否还没有被处理，它可能正在同一帧中被删除
            if (componentToAdd.contains(component)) {
                componentToAdd.remove(component);
                return;
            }

            componentToRemove.add(component);
        }

        /**
         * 立即从组件列表中删除所有组件
         */
        public removeAllComponents() {
            for (let i = 0; i < this._components.length; i++) {
                this.handleRemove(this._components[i]);
            }

            this._components.length = 0;
            this._updatableComponents.length = 0;
            this._componentsToAdd.length = 0;
            this._componentsToRemove.length = 0;
        }

        public deregisterAllComponents() {
            for (let component of this._components) {
                if (!component) continue;

                // 处理IUpdatable
                if (isIUpdatable(component))
                    new es.List(this._updatableComponents).remove(component);

                this._entity.componentBits.set(ComponentTypeManager.getIndexFor(TypeUtils.getType(component)), false);
                this._entity.scene.entityProcessors.onComponentRemoved(this._entity);
            }
        }

        public registerAllComponents() {
            for (let component of this._components) {
                if (isIUpdatable(component))
                    this._updatableComponents.push(component);

                this._entity.componentBits.set(ComponentTypeManager.getIndexFor(TypeUtils.getType(component)));
                this._entity.scene.entityProcessors.onComponentAdded(this._entity);
            }
        }

        /**
         * 处理任何需要删除或添加的组件
         */
        public updateLists() {
            if (this._componentsToRemove.length > 0) {
                for (let i = 0; i < this._componentsToRemove.length; i++) {
                    this.handleRemove(this._componentsToRemove[i]);
                    new es.List(this._components).remove(this._componentsToRemove[i]);
                }

                this._componentsToRemove.length = 0;
            }

            if (this._componentsToAdd.length > 0) {
                for (let i = 0, count = this._componentsToAdd.length; i < count; i++) {
                    let component = this._componentsToAdd[i];

                    if (isIUpdatable(component))
                        this._updatableComponents.push(component);

                    this._entity.componentBits.set(ComponentTypeManager.getIndexFor(TypeUtils.getType(component)));
                    this._entity.scene.entityProcessors.onComponentAdded(this._entity);

                    this._components.push(component);
                    this._tempBufferList.push(component);
                }

                // 在调用onAddedToEntity之前清除，以防添加更多组件
                this._componentsToAdd.length = 0;
                this._isComponentListUnsorted = true;

                // 现在所有的组件都添加到了场景中，我们再次循环并调用onAddedToEntity/onEnabled
                for (let i = 0; i < this._tempBufferList.length; i++) {
                    let component = this._tempBufferList[i];
                    component.onAddedToEntity();

                    // enabled检查实体和组件
                    if (component.enabled) {
                        component.onEnabled();
                    }
                }

                this._tempBufferList.length = 0;
            }

            // if (this._isComponentListUnsorted) {
            //     this._updatableComponents.sort(ComponentList.compareUpdatableOrder.compare);
            //     this._isComponentListUnsorted = false;
            // }
        }

        public handleRemove(component: Component) {
            if (isIUpdatable(component))
                new es.List(this._updatableComponents).remove(component);

            this._entity.componentBits.set(ComponentTypeManager.getIndexFor(TypeUtils.getType(component)), false);
            this._entity.scene.entityProcessors.onComponentRemoved(this._entity);

            component.onRemovedFromEntity();
            component.entity = null;
        }


        /**
         * 获取类型T的第一个组件并返回它
         * 可以选择跳过检查未初始化的组件(尚未调用onAddedToEntity方法的组件)
         * 如果没有找到组件，则返回null。
         * @param type
         * @param onlyReturnInitializedComponents
         */
        public getComponent<T extends Component>(type, onlyReturnInitializedComponents: boolean): T {
            for (let component of this._components) {
                if (component instanceof type)
                    return component as T;
            }

            // 我们可以选择检查挂起的组件，以防addComponent和getComponent在同一个框架中被调用
            if (!onlyReturnInitializedComponents) {
                for (let component of this._componentsToAdd) {
                    if (component instanceof type)
                        return component as T;
                }
            }

            return null;
        }

        /**
         * 获取T类型的所有组件，但不使用列表分配
         * @param typeName
         * @param components
         */
        public getComponents(typeName: any, components?) {
            if (!components)
                components = [];

            for (let component of this._components) {
                if (component instanceof typeName) {
                    components.push(component);
                }
            }

            // 我们还检查了待处理的组件，以防在同一帧中调用addComponent和getComponent
            for (let component of this._componentsToAdd) {
                if (component instanceof typeName) {
                    components.push(component);
                }
            }

            return components;
        }

        public update() {
            this.updateLists();
            for (let i = 0; i < this._updatableComponents.length; i++) {
                if (this._updatableComponents[i].enabled)
                    this._updatableComponents[i].update();
            }
        }

        public onEntityTransformChanged(comp: transform.Component) {
            for (let i = 0; i < this._components.length; i++) {
                if (this._components[i].enabled)
                    this._components[i].onEntityTransformChanged(comp);
            }

            for (let i = 0; i < this._componentsToAdd.length; i++) {
                if (this._componentsToAdd[i].enabled)
                    this._componentsToAdd[i].onEntityTransformChanged(comp);
            }
        }

        public onEntityEnabled() {
            for (let i = 0; i < this._components.length; i++)
                this._components[i].onEnabled();
        }

        public onEntityDisabled() {
            for (let i = 0; i < this._components.length; i++)
                this._components[i].onDisabled();
        }
    }
}