navigating to previous UIs

Vaadin 6 / 7 / 8
1

I am looking for multiwindow functionality to navigate to previous UIs and their state in V7. In V6, we could navigate to myapp/1 or myapp/2 and get its respective state based on UIID. If a user refreshes the same UI, they should get a new window/UI. If they specify an older UI window name,

Here’s an example of what I am trying in my UI extended class:


	protected void init(VaadinRequest request) {
		if (request.getParameter("uiid") != null && request.getParameter("uiid").length() > 0) {
			String windowName = request.getParameter("uiid");
			UI oldUI = this.getSession().getUIById(Integer.parseInt(windowName));
			if (oldUI != null) {
				// how do we forward on to the old UI?
				UI.getCurrent().setContent(oldUI.getContent()); // can I just forward on to the old UI instead of mirroring the old UI content?
				UI.setCurrent(oldUI);
				return;
			} 
		}
		
		initLayout();
	}

In the above, I was wondering if I can simply forward to the old ui if I have found it.

2

To customize how UI instance lookup is done you should create your own UIProvider.

3

From looking at the UIProvider examples, it looks like it is focused on providing different UIs for different devices (mobile etc). I am interested in providing previously created UIs based on a a request parameter. Looking up a previous UI instance looks straightforward but I’m not sure of the correct way to forward to it? Currently I am using with UI.getCurrent().setContent(oldUI.getContent()); as the code above shows.

4

I might have interpreted your question a bit wrong. Have you had a look at the built-in View and Navigator support (https://vaadin.com/wiki/-/wiki/Main/Creating%20a%20bookmarkable%20application%20with%20back%20button%20support).