Make iDempiere themes definable on different levels

@Anozi Mada contributed a plugin that implements a user theme selector at

https://wiki.idempiere.org/en/Plugin:_Theme_Pack#How_to_switch_theme.3F

I think is worthy to check if is interesting for core

Hi @Hiep Lq, just tried variant no 2 (java+java script way) and it work! Don't know if it is the best solution, but as temporary fix it's enough.

Many thanks, you just made my day

find out it.
two way:
1. java + config way:
in project org.adempiere.ui.zk see
org.zkforge.keylistener in
web.js.zkforge
detail document: http://books.zkoss.org/wiki/ZK%20Client-side%20Reference
read part: Language Definition and Widget Package Descriptor
2. java + java script way
in method doCreatePart class DefaultDesktop
add below code (modify for suitable with you)
String link = ThemeManager.getThemeResource("css/themeTest.css.dsp");
link = link.substring(1, link.length()); // remove "/" to define relate path
Clients.response("loadNewCss", new AuScript(null, String.format("zk.loadCSS ('%s', '%s')", link , "newTheme")));

I will attach next patch after changing it into Preference Dialog - seems it logical...

Currently I am wondering of usability this theme concept per Client. Thats mean login page will have some general UI loaded from default theme defined in system config. After successful login, default theme for client will be loaded (theme which is defined in AD_Theme with IsDefault=Y).
I've just tested this use case and looks like it is on a good way...BUT discovered one stopper which I was not able to solve. Default desktop is messed up, GUI components loaded by java classes are with correct client theme, but some CSS styles are loaded with previous default theme used when user is not logged (looks like css is loaded by login page and still used after login), css styles are not re-loaded with client theme....Desktop is loaded with correct client css styles and images only after manual refreshing of browser window.

Just need to find out way how to refresh browser window after login/change role from code, or css styles should be re-loaded after login/change role.

@Hiep Lq please write down some notes based on our discussion.

Thanks @Tomáš Švikruha,

Q1 - I prefer that into Preference Dialog - seems less clogged UI

Q2 - Not important for me - at this moment we can define those images in sysconfig keys