[FEAT] Close all panes on hardware back button event about panes

[roman-rr]

@woutersteven2020 Thank you, I'm understand the issue.
Good a feature request, it's would be nice access to Pane instances from window object, from any code part, like window['pane']: [CupertinoPane, CupertinoPane, CupertinoPane, ...].
I will review this feature for the future.

For now, I suggest you to place your pane to some Singleton service where you collect global app variables:

import { SharedService } from '../services/shared/shared/shared.service.ts';

constructor (shared: SharedService) {

  // when you initiate a pane save it to shared scope
  this.shared.pane = new CupertinoPane(...);
}

Than access it from your hardware button service.

Some similar issues about hardware button (#143, #150)

[woutersteven]

Thank you for your reply. I wrote Singeton service and updated my hardwareBackButtonEvent() to check for openPanes first (and close them) before trying to navigate back through the history, it's working nicely!