51 lines
1.5 KiB
JavaScript
51 lines
1.5 KiB
JavaScript
/*
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Copyright 2020 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import dis from './dispatcher';
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import SettingsStore, {SettingLevel} from './settings/SettingsStore';
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export class FontWatcher {
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constructor() {
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this._dispatcherRef = null;
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}
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start() {
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this._setRootFontSize(SettingsStore.getValue("font_size"));
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this._dispatcherRef = dis.register(this._onAction);
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}
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stop() {
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dis.unregister(this._dispatcherRef);
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}
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_onAction = (payload) => {
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if (payload.action === 'update-font-size') {
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this._setRootFontSize(payload.size);
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}
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};
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_setRootFontSize = size => {
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const min = SettingsStore.getValue("font_size_min");
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const max = SettingsStore.getValue("font_size_max");
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const fontSize = Math.max(Math.min(max, size), min);
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if (fontSize != size) {
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SettingsStore.setValue("font_size", null, SettingLevel.Device, fontSize);
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}
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document.querySelector(":root").style.fontSize = fontSize + "px";
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}
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}
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