Databases list: “read only” behaviour

[tmillross]

This pseudocode relates to the list of databases visible near the top of the right-hand panel, for a particular selected project. Follows from #7 and provides more detail for coding. Duplicates and extends this issue found on upstream repo.

1. Read-only checkbox is visible for all rows in the database list (done)
2. On open, read settings file entries to determine checked state (default=read-only)
3. On click:
   a. Send signal. Slot/method design described below for 2 possible state changes
   b. Change checked state

Setting a database read-only = true:

1. Find open activities relating to the checked db in the activity_cache
2. Call appropriate method to set their tables/rows/cells to read-only and set the Read-Only checkbox to greyed-out (as described in separate upcoming issue by @AnjeKnottnerus )
3. Activities inventory context menu: Options for “Edit activity” and “New activity” become greyed out (make this change here or on right-click?)
4. Top-right toolbar buttons: Options for “Edit activity” and “New activity” become greyed out (make this change here or on right-click?)
5. Insert or update entry in ab_settings file
6. Checkbox -> checked

Setting a database read-only = false.

1. Find open activities relating to the checked db in the activity_cache
2. Set read-only checkbox of open panels to active (not greyed out)
3. Activities inventory list: Options for “Edit activity” and “New activity” become active again (as above, may be handled on right-click)
4. Top-right toolbar buttons: Options for “Edit activity” and “New activity” become active again (as above, editability of currently selected activity would determine whether these are active)
5. Update settings file entry to read-only = false
6. Checkbox -> unchecked