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Using Control-a to select all text in a text widget

I'm having a difficult time binding Control-a so it selects all the
text in a widget just like the default Control-/ binding does. I've
tried:

..t bind <Control-a> [.t bind <Control-/>]

But [.t bind <Control-/>] returns nothing. If I do:

..t bind <Control-/> {puts "Selecting all"}
..t bind <Control-a> [.t bind <Control-/>]

When I hit Control-/ I get at the prompt "Selecting all" and all the
text is selected. But when I hit Control-a all I get is the "Selecting
all" at the prompt and no text is selected.

I've also tried:

..t bind <Control-a> {.t tag add sel 1.0 end}

And that doesn't work either. In fact, with this code if you do
Control-/ and then Control-a it unselects everything. And dumping the
tags for the entire region show the tagon/tagoff for sel are gone.

Does anyone know the semantics of Control-/? There's got to be more to
it.

- Ian

0
8/1/2007 4:54:06 PM
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I've just found this thread:

http://groups.google.com/group/comp.lang.tcl/browse_thread/thread/5c1df73696e94962/38ec894e32bafcd2?lnk=gst&q=select+all&rnum=8#38ec894e32bafcd2

Which seems to suggest there's nothing fancy about Control-/.

- Ian

0
8/1/2007 5:02:05 PM
And to answer my own question, the following works:

bind .t <Control-a> {%W tag add sel 1.0 end; break;}

- Ian

0
8/1/2007 5:09:00 PM
On Wed, 01 Aug 2007 16:54:06 -0000, sniff.scratch@gmail.com wrote:

>I'm having a difficult time binding Control-a so it selects all the
>text in a widget just like the default Control-/ binding does. I've
>tried:
>
>.t bind <Control-a> [.t bind <Control-/>]
>
>But [.t bind <Control-/>] returns nothing.

I think you'll find the binding is to the Text widget-class:

  <wish_prompt>% bind Text <Control-Key-/>
    %W tag add sel 1.0 end

So the following works for me:

  bind .t <Control-Key-a> [bind Text <Control-Key-/>

or, if you want this behaviour for every textbox,

  bind Text <Control-Key-a> [bind Text <Control-Key-/>

By the way, it's also quite nice to make "select all"
bind to "tag add sel 1.0 end-1c" to avoid selecting the
magic hidden final newline that finds its way into
the end of every text box.

Dunno why your explicit binding failed.  Maybe you'd also
bound something to "Text <Control-Key-a>" previously????
-- 
Jonathan Bromley, Consultant

DOULOS - Developing Design Know-how
VHDL * Verilog * SystemC * e * Perl * Tcl/Tk * Project Services

Doulos Ltd., 22 Market Place, Ringwood, BH24 1AW, UK
jonathan.bromley@MYCOMPANY.com
http://www.MYCOMPANY.com

The contents of this message may contain personal views which 
are not the views of Doulos Ltd., unless specifically stated.
0
8/1/2007 5:20:02 PM
sniff.scratch@gmail.com wrote:
> I'm having a difficult time binding Control-a so it selects all the
> text in a widget just like the default Control-/ binding does. I've
> tried:
> 
> .t bind <Control-a> [.t bind <Control-/>]
> 
> But [.t bind <Control-/>] returns nothing.

I presume you mean "bind .t" not ".t bind". The latter gives an error.

Your observation is correct. Default text bindings are on the class, not 
the widget.

Try: bind Text <Control-/> to see what Control-/ does in a text widget.

Have you read the full bind and bindtag man pages? They help describe 
this, though I don't think either one (nor the Text man page) explicitly 
state that bindings are on the class. Maybe it does, it's been a while 
since I looked at them with a fine toothed comb.


 > If I do:
> 
> .t bind <Control-/> {puts "Selecting all"}
> .t bind <Control-a> [.t bind <Control-/>]
> 
> When I hit Control-/ I get at the prompt "Selecting all" and all the
> text is selected. But when I hit Control-a all I get is the "Selecting
> all" at the prompt and no text is selected.

When you bind to <Control-/>, you are adding a new binding that gets 
fired *in addition to* the normal class bindings. When you added your 
own binding to Control-a, you're telling it to do nothing since there's 
not already a binding on the widget (see the comment above about default 
bindings being on the class, not the widget)

> 
> I've also tried:
> 
> .t bind <Control-a> {.t tag add sel 1.0 end}

You're almost there! The problem is, because of the way bindtags work, 
after your binding fires the default binding for Control-a fires, and 
that, in effect, eliminates the effect of your binding.
> 
> And that doesn't work either. In fact, with this code if you do
> Control-/ and then Control-a it unselects everything. And dumping the
> tags for the entire region show the tagon/tagoff for sel are gone.
> 
> Does anyone know the semantics of Control-/? There's got to be more to
> it.

You're on the right track. Your problem is in not yet understanding how 
bindings are fired, which has to do with bindtags.

I'll give you the solution, but you've got to promise to try and 
understand why the solution works and not just cut'n'paste it into your 
code.

Any of these will work (assuming I don't make any typos). The proper 
choice depends on your goal.

# duplicate control-/ as control-a for all text widgets
bind Text <Control-a> [bind Text <Control-/>]

# create your own control-a binding for all text widgets
bind Text <Control-a> {%W tag add sel 1.0 end}

# copy Text binding to the widget, and ignore default binding
bind .t <Control-a> "[bind Text <Control-/>]; break"

# add your own binding to the widget, and ignore the default binding
bind .t <Control-a> {.t tag add sel 1.0 end; break}




-- 
Bryan Oakley
http://www.tclscripting.com
0
oakley (2075)
8/1/2007 5:23:51 PM
Jonathan Bromley wrote:

> Dunno why your explicit binding failed.  Maybe you'd also
> bound something to "Text <Control-Key-a>" previously????


It didn't fail. It's just that without a "break" the class binding for 
<Control-a> fired and nullified the effect.

To prove the point, start a new interpreter and do the following, and 
you'll see that his binding actually does work:

pack [text .t]
bind .t <Control-a> {.t tag add sel 1.0 end}
bind Text <Control-a> {} ;# disable the class binding


-- 
Bryan Oakley
http://www.tclscripting.com
0
oakley (2075)
8/1/2007 5:30:09 PM
On Wed, 01 Aug 2007 17:30:09 GMT, Bryan Oakley
<oakley@bardo.clearlight.com> wrote:

>Jonathan Bromley wrote:
>
>> Dunno why your explicit binding failed.  Maybe you'd also
>> bound something to "Text <Control-Key-a>" previously????
>
>
>It didn't fail. It's just that without a "break" the class binding for 
><Control-a> fired and nullified the effect.

Bryan, thanks.  By a combination of careless reading of
the list of bindings, and careless trial of two different
things in an unfortunate order, I had convinced myself
that there was no Text class binding to ctrl-a.

>To prove the point, start a new interpreter and do the following, and 
>you'll see that his binding actually does work:

Sure.  Apologies for the confusion.

Thanks for the clarification, and the reminder about using
[break] when overriding bindings!
-- 
Jonathan Bromley, Consultant

DOULOS - Developing Design Know-how
VHDL * Verilog * SystemC * e * Perl * Tcl/Tk * Project Services

Doulos Ltd., 22 Market Place, Ringwood, BH24 1AW, UK
jonathan.bromley@MYCOMPANY.com
http://www.MYCOMPANY.com

The contents of this message may contain personal views which 
are not the views of Doulos Ltd., unless specifically stated.
0
8/1/2007 5:38:30 PM

I wonder if it might be useful to take a set of bindings for things
like this and add them to tklib, to make it easier for people to add
common bindings. There could be sets - a "vi" set of bindings, etc.

0
lvirden (1938)
8/2/2007 10:32:30 AM
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... Stanley's go-it-alone handling of the offering process. Though 32 other underwriters signed on to the deal, Morgan Stanley retained tight control ...

‘General Hospital’ Spoilers: Helena’s Fluke Mind Control a Red Herring or Did She Create A Luke Spencer ...
“General Hospital” spoilers teased for months that in February 2015 we would finally learn the identity of Fluke, the Luke Spencer impostor. ...

Resources last updated: 3/13/2016 2:02:01 PM