[Scilab-users] Recognition of cursor key as input

[stephane.mottelet at utc.fr]

  Would this small example fit your needs ?

function handler(win,x,y,ibut)
    global _keypress
    if or(ibut==(37:40))
        _keypress=ibut;
    end
endfunction

function key=waitforkeypress()
    global _keypress
    set(gcf(),'event_handler','handler','event_handler_enable','on')
    _keypress=0;
    while ~_keypress
        sleep(1)
    end
    set(gcf(),'event_handler_enable','off')
    key=_keypress;
endfunction

while 1
    select waitforkeypress()
    case 37
        disp('left')
    case 38
        disp('up')
    case 39
        disp('right')
    case 40
        disp('down')       
        break
    end
end

S.

Jens <j.s.strom at hslmg.de> a écrit :

> Hello,
> My event_handler experiments with the Scilab help example in "Event
> handler functions" (see below) led to nothing.  I can see the "event" at
> the bottom of the graphic window but I cannot arrest it in a variable. I
> tried this:
>
>           function my_eventhandler(win, x, y, ibut)  if ibut==-1000 then
> return,end  [x,y]=xchange[1](x,y,'i2f')  xinfo[2](msprintf[3]('Event
> code %d at mouse position is (%f,%f)',ibut,x,y))endfunction
> plot2d[4]()fig = gcf[5]() ;fig.event_handler = 'my_eventhandler'
> ;fig.event_handler_enable = "on" ;//now://   -  move the mouse over the
> graphic window//   -  press and release keys shifted or not with Ctrl
> pressed or not//   -  press button, wait a little release//   -  press
> and release button//   -  double-click button fig.event_handler_enable =
> "off" ; //suppress the event handler        	        <a
> href="scilab://scilab.execexample/"> 	        <a
> href="scilab://scilab.editexample/">
>
> I fear I must retire to 
> m=evstr(x_dialog(...)  Jens
>
>
----------------------------------------------------------------------------
>
> Am 13.08.2014 11:12, schrieb mottelet [via Scilab / Xcos - Mailing Lists
> Archives]:
>
>> Hello,
>>
>> IMHO, the only way to trap a keypress and get the ascii (?) code is to
>> use the event_handler callback of a figure :
>>
>> function handler(x,y,ibut)
>> //
>> endfunction
>>
>> f=gcf();
>> f.event_handler='handler';
>> ​f.event_handle_enable='on';
>>
>> On my computer, I have the following mapping 
>>
>> left arrow pressed : ibut=37 (released=-37)
>> up arrow : 38
>> right arrow 39
>> down arrow 40
>>
>> The problem is that you need to have a figure opened, and that this
>> figure must have the focus.
>>
>> S.
>>
>>    Jens <[hidden email][6]> a écrit :
>>
>>> Hi Samuel,
>>> ASCII representation of up, down etc. would help me if I knew a Scilab
>>> command which puts the ascii value into a variable. input() is
>>> definitely
>>> unable to do so.
>>>
>>> Jens
>>>
>>> --
>>> View this message in context:
>>>
http://mailinglists.scilab.org/Scilab-users-Recognition-of-cursor-key-as-input-tp4031013p4031026.html
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>>
>>  
>>
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>
> -------------------------
>
>   View this message in context: Re: Recognition of cursor key as
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[1] xchange.html
[2] xinfo.html
[3] msprintf.html
[4] plot2d.html
[5] gcf.html
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