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implement lazy loading of tabs which speeds up especially initial startup with many tabs

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This commit is contained in:
zadam 2020-04-22 23:09:35 +02:00
parent 8526cb2315
commit ff853c7d0a
1 changed files with 20 additions and 12 deletions
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32
src/public/app/widgets/tab_caching_widget.js
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@ -57,29 +57,37 @@ export default class TabCachingWidget extends TabAwareWidget {
}
}
/**
* widget.hasBeenAlreadyShown is intended for lazy loading of cached tabs - initial note switches of new tabs
* are not executed, we're waiting for the first tab activation and then we update the tab. After this initial
* activation further note switches are always propagated to the tabs.
*/
handleEventInChildren(name, data) {
// stop propagation of the event to the children, individual tab widget should not know about tab switching
// since they are per-tab
if (name === 'tabNoteSwitchedAndActivated') {
name = 'tabNoteSwitched';
}
if (name === 'tabNoteSwitched') {
if (['tabNoteSwitched', 'tabNoteSwitchedAndActivated'].includes(name)) {
// this event is propagated only to the widgets of a particular tab
const widget = this.widgets[data.tabContext.tabId];
if (widget) {
return widget.handleEvent(name, data);
if (widget && (widget.hasBeenAlreadyShown || name === 'tabNoteSwitchedAndActivated')) {
return widget.handleEvent('tabNoteSwitched', data);
}
else {
return Promise.resolve();
}
}
if (name !== 'activeTabChanged') {
return super.handleEventInChildren(name, data);
}
if (name === 'activeTabChanged') {
const widget = this.widgets[data.tabContext.tabId];
if (widget.hasBeenAlreadyShown) {
return Promise.resolve();
}
else {
widget.hasBeenAlreadyShown = true;
return widget.handleEvent(name, data);
}
} else {
return super.handleEventInChildren(name, data);
}
}
}