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Navigation bar can be complex and comprises of several different elements.
Until now the navigation bar was almost hardcoded. We needed to separate
different types of navigation bar elements:
* NAV_BAR_FIRST
- the first element, usually denoting gallery root. This element takes
priority and is used when there are no other elements in the path.
* NAV_BAR_ELEM
- normal element used in the path between first and last elements.
* NAV_BAR_LAST
- ending element, guaranteed there's at least the NAV_BAR_FIRST element
before.
* NAV_BAR_CURRENT
- non-clickable informational element displaying the current page title.
Optional, in contrast to the former three defines.
* NAV_BAR_CURRENT_ROOT
- a special case of the latter one, displayed at the very root page.
Also optional, in that case the navigation bar would become empty.
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This extends current templating system to another dimension,
bringing the possibility to have multiple themes generated
at once. The purpose is to be able to switch between multiple
designs, from PC to mobile, classic vs. flat view, slideshow, etc.
For the moment, only the classic theme is available.
Rules:
* for switching between themes, place a link inside your template
manually - it's not a cgg concern, only your theming infrastructure
* don't forget to define different file names for index and album
pages across different themes
* it's recommended to keep default theme named as "index.*" to avoid
showing directory listing on webserver
Notes:
* some TODOs will be fixed when we have new theme using these advanced
features (e.g. pictures in album pages)
* TODO: introduce tag/block conditional system, allow custom user
defines for each theme/page
* TODO: deprecate <show_go_up>, <show_exif_table> and <border style>
in favor of conditionals (these tags belong to theming)
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