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Merge pull request #3657 from matrix-org/dbkr/matchmedia_conditional_events

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Make addEventListener conditional
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David Baker 2019-11-22 13:09:01 +00:00 committed by GitHub
commit abdf3c4a58
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1 changed files with 8 additions and 4 deletions
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12
src/theme.js
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@ -41,14 +41,18 @@ export class ThemeWatcher {
start() {
this._themeWatchRef = SettingsStore.watchSetting("theme", null, this._onChange);
this._systemThemeWatchRef = SettingsStore.watchSetting("use_system_theme", null, this._onChange);
this._preferDark.addEventListener('change', this._onChange);
this._preferLight.addEventListener('change', this._onChange);
if (this._preferDark.addEventListener) {
this._preferDark.addEventListener('change', this._onChange);
this._preferLight.addEventListener('change', this._onChange);
}
this._dispatcherRef = dis.register(this._onAction);
}
stop() {
this._preferDark.removeEventListener('change', this._onChange);
this._preferLight.removeEventListener('change', this._onChange);
if (this._preferDark.addEventListener) {
this._preferDark.removeEventListener('change', this._onChange);
this._preferLight.removeEventListener('change', this._onChange);
}
SettingsStore.unwatchSetting(this._systemThemeWatchRef);
SettingsStore.unwatchSetting(this._themeWatchRef);
dis.unregister(this._dispatcherRef);