ComboBox keybindings

["Matthias Clasen" <maclas gmx de>]

Hi Calum,

in my quest to get the new combobox widgets in shape for 2.4, I've come 
around to look at the keybindings. Here is what is currently implemented:

when the popup is not displayed and the focus is in the button or in the 
entry of a editable combo box:
- Alt-Down  displays the popup
- Down/Up, Page Up/Page Down, Home/End  change the selected 
  item without displaying the popup

when the popup is displayed in menu mode:
- regular menu keybindings 
- Alt-Up  hides the menu without changing the selected item

when the popup is displayed in list mode:
- Esc, Alt-Up  hide the popup without changing the selected item
- Return, Space  hide the popup and change the selected item
- Down/Up, Page Up/Page Down, Home/End  move the selection 
  in the list
Note that Page Up/Page Down should move page-wise, but the 
list mode doesn't support scrolling yet...


There are some points on which I'm not 100% sure:

- Should we use Alt-Up, Alt-Down to toggle display of the popup
  (inherited from GtkCombo, also seen in e.g. IE) or Ctrl-Up, 
  Ctrl-Down as in the aging keybindings document? 

- Should Tab work to hide the display and move the focus when
  the list is displayed? 
  Pro: 
    +makes Tab navigation more consistent
    +IE does this as well
  Con:
    -might feel a bit strange, at least in menu mode, since Tab
     doesn't normally work like that in menus
    -the case might be stronger for entrycompletion, where the
     popup works more like a very specialized input method

- Should the keybindings document be updated?


Matthias


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