103 lines
3.1 KiB
JavaScript
103 lines
3.1 KiB
JavaScript
/*
|
|
* Copyright (C) 2020 Alex Yatskov <alex@foosoft.net>
|
|
* Author: Alex Yatskov <alex@foosoft.net>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/* global
|
|
* apiForward
|
|
*/
|
|
|
|
class FrameOffsetForwarder {
|
|
constructor() {
|
|
this._started = false;
|
|
|
|
this._forwardFrameOffset = (
|
|
window !== window.parent ?
|
|
this._forwardFrameOffsetParent.bind(this) :
|
|
this._forwardFrameOffsetOrigin.bind(this)
|
|
);
|
|
|
|
this._windowMessageHandlers = new Map([
|
|
['getFrameOffset', ({offset, uniqueId}, e) => this._onGetFrameOffset(offset, uniqueId, e)]
|
|
]);
|
|
}
|
|
|
|
start() {
|
|
if (this._started) { return; }
|
|
window.addEventListener('message', this.onMessage.bind(this), false);
|
|
this._started = true;
|
|
}
|
|
|
|
async getOffset() {
|
|
const uniqueId = yomichan.generateId(16);
|
|
|
|
const frameOffsetPromise = yomichan.getTemporaryListenerResult(
|
|
chrome.runtime.onMessage,
|
|
({action, params}, {resolve}) => {
|
|
if (action === 'frameOffset' && isObject(params) && params.uniqueId === uniqueId) {
|
|
resolve(params);
|
|
}
|
|
},
|
|
5000
|
|
);
|
|
|
|
window.parent.postMessage({
|
|
action: 'getFrameOffset',
|
|
params: {
|
|
uniqueId,
|
|
offset: [0, 0]
|
|
}
|
|
}, '*');
|
|
|
|
const {offset} = await frameOffsetPromise;
|
|
return offset;
|
|
}
|
|
|
|
onMessage(e) {
|
|
const {action, params} = e.data;
|
|
const handler = this._windowMessageHandlers.get(action);
|
|
if (typeof handler !== 'function') { return; }
|
|
handler(params, e);
|
|
}
|
|
|
|
_onGetFrameOffset(offset, uniqueId, e) {
|
|
let sourceFrame = null;
|
|
for (const frame of document.querySelectorAll('frame, iframe:not(.yomichan-float)')) {
|
|
if (frame.contentWindow !== e.source) { continue; }
|
|
sourceFrame = frame;
|
|
break;
|
|
}
|
|
if (sourceFrame === null) {
|
|
this._forwardFrameOffsetOrigin(null, uniqueId);
|
|
return;
|
|
}
|
|
|
|
const [forwardedX, forwardedY] = offset;
|
|
const {x, y} = sourceFrame.getBoundingClientRect();
|
|
offset = [forwardedX + x, forwardedY + y];
|
|
|
|
this._forwardFrameOffset(offset, uniqueId);
|
|
}
|
|
|
|
_forwardFrameOffsetParent(offset, uniqueId) {
|
|
window.parent.postMessage({action: 'getFrameOffset', params: {offset, uniqueId}}, '*');
|
|
}
|
|
|
|
_forwardFrameOffsetOrigin(offset, uniqueId) {
|
|
apiForward('frameOffset', {offset, uniqueId});
|
|
}
|
|
}
|