[Vm-dev] Handling function keys in unix
guillermopolito at gmail.com
Tue Nov 22 18:53:58 UTC 2011
Hmm, here again :)
Eclipse help page talks about keystrokes, not keychars:
And so happens in my pharo image (but not in the VM :/). So here we have
an inconsistency (*keyChar* event on the vm, *keyChar* in the HandMorph,
keystroke event on the rest of the image).
Don't you think it should be named keystroke everywhere? Because If I
stroke F4, it's a kestroke. It will not have a charCode, but It'll have a
On Tue, Nov 22, 2011 at 3:11 PM, Guillermo Polito <guillermopolito at gmail.com
> On Tue, Nov 22, 2011 at 12:06 PM, Igor Stasenko <siguctua at gmail.com>wrote:
>> because these keys are not producing "characters", but they are kind
>> of "meta" keys which could modify the input.
>> as far as i understood, this line of code tells that it generates the
>> "KeyChar" event only if there's a character key pressed.
>> for other keys, like arrows, home/pgUp/pgDn etc you have key codes,
>> but not char codes, because there is no direct mapping between them
>> and any ascii/unicode character.
>> imagine that all keys on your keyboard having a number. Esc - 1 , F1 - 2
>> , etc.
>> So, these numbers are key codes. Now some keys can be directly
>> translated to characters when pressed (depending on keyboard
>> layout/language settings), but some of them not, and has only the key
> Hmm, but in my image, if I press the left arrow, I get a KeyPress :P. So
> it's cheating! haha.
> More, on, look at this for example:
> case XK_Left: return 28;
> case XK_Up: return 30;
> case XK_Right: return 29;
> case XK_Down: return 31;
> case XK_Insert: return 5;
> case XK_Prior: return 11; /* page up */
> case XK_Next: return 12; /* page down */
> case XK_Home: return 1;
> case XK_End: return 4;
> case XK_KP_Left: return 28;
> case XK_KP_Up: return 30;
> case XK_KP_Right: return 29;
> case XK_KP_Down: return 31;
> case XK_KP_Insert: return 5;
> case XK_KP_Prior: return 11; /* page up */
> case XK_KP_Next: return 12; /* page down */
> case XK_KP_Home: return 1;
> case XK_KP_End: return 4;
> All those keys are treated as characters since their value is < 128 :S
> What I'm wondering now is: Should keybindings/shortcuts/"whatever name
> you want for them" be activated on keypress, keydown or keyup?
> I'll have a look at eclipse source code xD.
> Thank you very much :)
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