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Tidy up the region menu a bit, and hopefully clarify what regions will be

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operated on in different circumstances.  Make the main menubar Region menu
the same as the context one, and use the same logic to sensitize/desensitize
actions for them.


git-svn-id: svn://localhost/ardour2/branches/3.0@7954 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Carl Hetherington 2010-11-03 22:19:29 +00:00
parent f9d6a7329c
commit b5ab2e030b
21 changed files with 1076 additions and 1145 deletions
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36
doc/region_ops.txt Normal file
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How to choose what regions to perform operations on
---------------------------------------------------
Divide region actions into 3 groups:
1. Actions that operate on the selection, and for which the edit point type and location is irrelevant.
e.g. remove-region, rename-region, boost-region-gain
2. Actions that are not related to the selection, but for which the edit point location is important
e.g. insert-region-from-region-list
3. Actions that operate on the selection, and for which the edit point location is important
e.g. set-region-sync-position, place-transient
For group 1, Editor::get_regions_from_selection_and_entered() is used to decide which regions to operate
on. This method returns the selected regions, unless there are none, in which case it returns the last
region that the mouse entered.
For group 3, Editor::get_regions_from_selection_and_edit_point() is used to decide which regions to operate
on.
If the edit point is `mouse':
if the mouse is over a selected region, or no region, this method returns all selected regions.
if the mouse is over an unselected region, just that region is returned.
For other edit points the method returns the selected regions AND those that are both under the edit position
AND on a selected track, or on a track which is in the same active edit-enabled route group as a selected
region.
The action handlers call the appropriate method to decide which regions to operate on.
In addition, Editor::sensitize_the_right_region_actions() is called when a Region menu is about to be displayed,
and it sensitizes the actions that are appropriate given the current situation. When selecting things from
a menu, group 3 operations are disabled if the edit point is `mouse', as the mouse will be positioned over
the menu and its position is hence meaningless.