[SailfishDevel] Sailfish pageStack, web-like forward/back browsing, pushExtra()

[Filip Kłębczyk]

Hello all,

I've encountered few interesting things when playing with Sailfish SDK 
which I would like to share with you and look for some answers here.

1. In the Sailfish Silica documentation page about QML PageStack there 
is only one of the push methods described - push(). It's behavior is 
simple it pushes page to stack and switches to it. In gallery of Silica 
components you can see that there is also another way to push pages on 
stack - that is through pushExtra(). What's interesting in the 
pushExtra() method? It allows you to achieve a web browser-like 
forward/back navigation through pages (as far as I remember thp was 
interested in such functionality yesterday on #sailfishos). Anyway I 
wonder why there is nothing about pushExtra() in the offical 
documentation? Do we developers are not supposed to use it or is it 
planned to be official for the future releases of Sailfish?

2. Regarding pushExtra() I noticed that when there is only initial page 
(so one page on the stack) then even if you use pushExtra() you cannot 
easily access to the next page (through swiping/flicking from left to 
right) like it is possible, when there are already more pages on the 
stack. Is there a solution for this problem?

3. I also found an interesting bug which you can easily achieve by using 
push() then few times pushExtra() and then push(). It makes a a real 
mess to the stack.

To let you understand all the points better here is a video that shows 
above issues (yay! everyone loves videos!)
http://www.youtube.com/watch?v=UFfRy5zd2O8

Last but not least I would like to thank Jolla for releasing great alpha 
SDK and our amazing community for what it is doing with it since it's 
release.

Best regards,
Filip

PS. Some spelling errors I've found reading documentation:
https://sailfishos.org/sailfish-silica/qml-sailfishsilica-applicationwindow.html
Hierchical -> Hierarchical
provdes -> provides

PS2. It would be nice (at least for me) if the names of methods in 
documentation would somehow differ from their description (bold or some 
typewriter font?).