めぶきちゃんねるでカタログ、またはスレッドにいる時にstateをアップデートしsubscriberに送信します
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/552225/1688437/mebuki-page-state.js
// ==UserScript==
// @name mebuki-page-state
// @namespace https://mebuki.moe/
// @version 0.1.6
// @description めぶきちゃんねるでカタログ、またはスレッドにいる時にstateをアップデートしsubscriberに送信します
// @author ame-chan
// @match https://mebuki.moe/app*
// @license MIT
// @run-at document-idle
// ==/UserScript==
(function () {
'use strict';
class StateManager {
listeners;
state;
/**
* 初期状態を指定してインスタンスを作成する
* @param {T} initialState 管理する状態の初期値
*/ constructor(initialState) {
this.listeners = [];
this.state = {
...initialState,
};
}
/**
* 現在の状態を取得する (Readonly)
* @returns {Readonly<T>} 現在の状態オブジェクト
*/ getState() {
return {
...this.state,
};
}
/**
* 状態を部分的に更新し、購読者に通知する
* @param {Partial<T>} newState 更新したい状態のキーと値を持つオブジェクト
* @returns {void}
*/ updateState(newState) {
const oldState = this.state;
this.state = {
...this.state,
...newState,
};
if (this.state !== oldState) {
this.notifyListeners();
}
}
/**
* 状態の変更を購読する
* @param {function(state): void} listener 状態変更時に呼び出すコールバック
* @returns {function(): void} 購読解除用の関数
*/ subscribe(listener) {
this.listeners.push(listener);
return () => {
this.listeners = this.listeners.filter((l) => l !== listener);
};
}
/**
* 購読者に現在の状態を通知する
* @private
* @returns {void}
*/ notifyListeners() {
const currentState = this.getState();
this.listeners.forEach((listener) => listener(currentState));
}
}
const initialState = {
isCatalogPage: false,
isThreadPage: false,
threadMessageCount: 0,
};
const stateManager = new StateManager(initialState);
const updateState = () => {
const threadMessageElms = document.querySelectorAll('.thread-messages > [id^="message-"]');
const threadMessageCount = threadMessageElms.length;
const isCatalogPage = /^\/app\/?$/.test(location.pathname);
const currentState = stateManager.getState();
if (threadMessageCount > 0) {
if (
!currentState.isThreadPage ||
currentState.isCatalogPage ||
currentState.threadMessageCount !== threadMessageCount
) {
stateManager.updateState({
isThreadPage: true,
isCatalogPage: false,
threadMessageCount,
});
}
} else if (isCatalogPage) {
if (currentState.isThreadPage || !currentState.isCatalogPage) {
stateManager.updateState({
isThreadPage: false,
isCatalogPage: true,
threadMessageCount: 0,
});
}
} else {
if (currentState.isThreadPage || currentState.isCatalogPage) {
stateManager.updateState({
isThreadPage: false,
isCatalogPage: false,
threadMessageCount: 0,
});
}
}
};
const observer = new MutationObserver(updateState);
updateState();
observer.observe(document.body, {
childList: true,
subtree: true,
});
window.USER_SCRIPT_MEBUKI_STATE = {
stateManager,
subscribe: (listener) => stateManager.subscribe(listener),
getState: () => stateManager.getState(),
};
})();