[racket] Need Help With Keybindings

I've just added this to the docs. Hope it is helpful.

Robby

Another example, this file rebinds ``control-w'' to delete the word
behind the insertion point, but it does it by setting a new key to
be an existing keyboard shortcut. If you see a key in the
@onscreen{Show Active Keybindings} dialog (in the @onscreen{Keybindings}
submenu of the @onscreen{Edit} menu), then you can use its
name with the new keystroke you want, like this:

#lang s-exp framework/keybinding-lang

(define (rebind name new)
  (keybinding
   new
   (lambda (ed evt)
     (send (send ed get-keymap) call-function name ed evt #t))))

(rebind "backward-kill-word" "c:w")


On Mon, Sep 26, 2011 at 6:10 AM, Robby Findler
<robby at eecs.northwestern.edu> wrote:
> Two built-in keys that do that are esc;backspace (and possibly
> alt-backspace, depending on your platform), and control-shift-left,
> which selects a word backwards (which you can then delete or cut or
> select another one or whatever).
>
> Robby
>
> On Sun, Sep 25, 2011 at 10:59 PM, David G. Kay <dgkdgk at gmail.com> wrote:
>>
>> The most important thing I need at
>> this point is a way to bind ^W to
>> something like delete-word-backwards.
>> Most of the other things I really wanted
>> I could do with the 'move' command,
>> but I can't find something like delete-
>> word-backwards at
>>      http://docs.racket-lang.org/gui/text_.html
>> I see the delete command, but surely
>> I don't have to build my own delete-
>> word-backwards from there when that
>> operation must already exist in the
>> emacs-like bindings.
>> Is there not a keybindings file
>> somewhere already that does the
>> emacs-style bindings, which I
>> could just modify to use different
>> keys?  Am I missing something
>> fundamental in how this whole
>> thing works?
>> --DGK
>>
>> On Sun, Sep 11, 2011 at 12:24 PM, David G. Kay <dgkdgk at gmail.com> wrote:
>>>
>>> Thank you; that's great.   I'm most of the way
>>> there now.
>>> Still, I'm finding the text% documentation
>>> tough sledding; the tools seem lower-level
>>> than I need.
>>> Is there a keybinding file somewhere for
>>> emacs commands?  I think changing the
>>> actual keystrokes in that file would be the
>>> easiest way for me to do what I want.
>>> Thanks,
>>> --DGK
>>>
>>> On Sat, Sep 10, 2011 at 2:22 PM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
>>>>
>>>> At Sat, 10 Sep 2011 12:56:29 -0700, "David G. Kay" wrote:
>>>> > Hi, everyone;
>>>> >
>>>> > I'd like to rebind some of the DrRacket
>>>> > editor keys.  (I'm trying to reproduce the
>>>> > idiosyncratic editor layout I'm used to;
>>>> > it has an emacs flavor but with different
>>>> > keys.)
>>>> >
>>>> > To start, I just want to map ^t to move
>>>> > up a line, ^v to move down, ^f to move
>>>> > left, and ^g to move right.
>>>> >
>>>> > I created this file ("keys.rkt"):
>>>> >
>>>> > #lang s-exp framework/keybinding-lang
>>>> >
>>>> > (keybinding "c:t" (lambda (editor evt) (send editor previous-line)))
>>>> > (keybinding "c:v" (lambda (editor evt) (send editor next-line)))
>>>> > (keybinding "c:f" (lambda (editor evt) (send editor
>>>> > backward-character)))
>>>> > (keybinding "c:g" (lambda (editor evt) (send editor
>>>> > forward-character)))
>>>> >
>>>> >
>>>> > I add the file using "Add User-defined
>>>> > Keybindings" in DrRacket.  But I get
>>>> > this message as soon as I type one of
>>>> > my rebound keys:
>>>> >
>>>> > Error running keybinding .../Scheme/keys.rkt:18:18
>>>> >
>>>> > send: no such method: previous-line for class:
>>>> > ...engine/test-tool.scm:36:6
>>>> >
>>>> >
>>>> > It's complaining about the previous-line
>>>> > method, but that's listed in section 7
>>>> > (Editor Functions) of the Racket Graphical
>>>> > Interface Toolkit manual:
>>>> >
>>>> > http://docs.racket-lang.org/gui/Editor_Functions.html?q=Editor_Functions&q=edit
>>>> > or%25&q=forward-select-word&q=key%20bindings
>>>>
>>>> I can see how it's confusing, but that isn't a list of methods. It's a
>>>> list of strings that are mapped to functions in a keymap%, where the
>>>> string is eventually converted to a function through the
>>>> `call-function' method of keymap%. The extra level of indirection is an
>>>> ugly artifact of the days when parts of the GUI toolkit were
>>>> implemented in C++.
>>>>
>>>>
>>>> For text-editor methods, look here:
>>>>
>>>>  http://docs.racket-lang.org/gui/text_.html
>>>>
>>>> I think you want to use the `move' method.
>>>>
>>>
>>
>>
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