PingChuan
132 lines
3.5 KiB
TypeScript
132 lines
3.5 KiB
TypeScript
/**
|
|
* Collabora 页数信息获取模块
|
|
*
|
|
* @encoding UTF-8
|
|
*/
|
|
|
|
/**
|
|
* 页数信息接口
|
|
*/
|
|
export interface PageInfo {
|
|
totalPages: number;
|
|
currentPage: number;
|
|
timestamp: number;
|
|
}
|
|
|
|
/**
|
|
* Collabora PostMessage 数据类型
|
|
*/
|
|
interface CollaboraMessageData {
|
|
MessageId?: string;
|
|
msgId?: string;
|
|
// bundle.js _postMessage 发送的格式
|
|
Values?: {
|
|
Command?: string;
|
|
Status?: string;
|
|
totalPages?: number;
|
|
currentPage?: number;
|
|
timestamp?: number;
|
|
pages?: number;
|
|
[key: string]: unknown;
|
|
};
|
|
// 原始插件返回的格式
|
|
args?: {
|
|
Command?: string;
|
|
Status?: string;
|
|
totalPages?: number;
|
|
currentPage?: number;
|
|
timestamp?: number;
|
|
[key: string]: unknown;
|
|
};
|
|
[key: string]: unknown;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* 解析 PostMessage 数据
|
|
*/
|
|
function parseMessageData(data: unknown): CollaboraMessageData {
|
|
if (typeof data === 'string') {
|
|
return JSON.parse(data) as CollaboraMessageData;
|
|
}
|
|
return data as CollaboraMessageData;
|
|
}
|
|
|
|
|
|
/**
|
|
* 通过 PostMessage 请求页数信息
|
|
*
|
|
* 使用自定义 custompostMessage 插件获取文档页数。
|
|
* 注意: Collabora 的页码是从 0 开始的。
|
|
*
|
|
* @param iframeWindow - iframe 的 contentWindow
|
|
* @returns Promise，解析为页数信息
|
|
*
|
|
* @example
|
|
* ```typescript
|
|
* const info = await requestPageInfo(iframeWindow);
|
|
* console.log(`文档共 ${info.totalPages} 页，当前在第 ${info.currentPage + 1} 页`);
|
|
* ```
|
|
*/
|
|
export async function requestPageInfo(iframeWindow: Window): Promise<PageInfo> {
|
|
return new Promise((resolve, reject) => {
|
|
const timeout = setTimeout(() => {
|
|
cleanup();
|
|
reject(new Error('请求页数信息超时'));
|
|
}, 5000);
|
|
|
|
const handleMessage = (event: MessageEvent) => {
|
|
try {
|
|
if (event.source !== iframeWindow) {
|
|
return;
|
|
}
|
|
|
|
const data = parseMessageData(event.data);
|
|
|
|
// bundle.js 的 _postMessage 会将消息转换为:
|
|
// { MessageId: 'custompostMessage_Resp', Values: { Command: 'GET_PAGE_INFO', ... } }
|
|
// 所以我们需要监听 MessageId 而不是 msgId
|
|
if (
|
|
data.MessageId === 'custompostMessage_Resp' &&
|
|
data.Values?.Command === 'GET_PAGE_INFO' &&
|
|
data.Values?.Status === 'success'
|
|
) {
|
|
clearTimeout(timeout);
|
|
cleanup();
|
|
|
|
const info: PageInfo = {
|
|
totalPages: data.Values.totalPages || 0,
|
|
currentPage: data.Values.currentPage || 0,
|
|
timestamp: data.Values.timestamp || Date.now(),
|
|
};
|
|
|
|
resolve(info);
|
|
}
|
|
} catch (error) {
|
|
clearTimeout(timeout);
|
|
cleanup();
|
|
reject(error);
|
|
}
|
|
};
|
|
|
|
const cleanup = () => {
|
|
window.removeEventListener('message', handleMessage);
|
|
};
|
|
|
|
window.addEventListener('message', handleMessage);
|
|
|
|
// 发送请求消息
|
|
const message = {
|
|
MessageId: 'custompostMessage',
|
|
Values: {
|
|
Command: 'GET_PAGE_INFO',
|
|
Args: {},
|
|
},
|
|
};
|
|
|
|
iframeWindow.postMessage(JSON.stringify(message), '*');
|
|
});
|
|
}
|
|
|