Using TkEntry with copy/paste

ruby-talk
1

I'm writing a Ruby/Tk program where I want a TkEntry field with a
state of "readonly" so a user can copy/paste from it, but not modify
it. Unfortunately this prevents me from programatically changing it,
which I want to do. Is there a better way to accomplish that?

Sample code: TkEntry does not display "hi" after button click.

<code>
require 'tk'
top = TkRoot.new
entry = TkEntry.new(top) {state "readonly";grid('row'=>0, 'column'=>0)}

TkButton.new(top) {text 'Convert'; grid('row'=>1, 'column'=>0);
  # the "entry" field update fails, as documented
  command proc {entry.value = "hi"}
}
Tk.mainloop

## Environment
# Ubuntu 10.4
# 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 22:02:19 UTC 2010
# i686 GNU/Linux
# ruby 1.8.7 (2010-01-10 patchlevel 249) [i486-linux]
# libtcltk-ruby
# libtcltk-ruby1.8
</code>

Thanks,
Mathew Cucuzella

···

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2

Message-ID: <1a5a8e5e8201d16e9807a4a633423f5d@ruby-forum.com>

I'm writing a Ruby/Tk program where I want a TkEntry field with a
state of "readonly" so a user can copy/paste from it, but not modify
it. Unfortunately this prevents me from programatically changing it,
which I want to do. Is there a better way to accomplish that?

How about the following

<code>
require 'tk'
top = TkRoot.new
var = TkVariable.new
entry = TkEntry.new(top, :state=>'readonly',
                         :textvariable=>var).grid(:row=>0, :column=>0)
TkButton.new(top, :text=>'Convert',
                  :command=>proc{var.value = 'hi'}).grid(:row=>1, :column=>0)

Tk.mainloop
</code>

···

From: Mathew Cucuzella <kookjr@gmail.com>
Subject: using TkEntry with copy/paste
Date: Mon, 7 Jun 2010 18:26:05 +0900

--
Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)

3

Hidetoshi NAGAI wrote:

How about the following

<code>
require 'tk'
top = TkRoot.new
var = TkVariable.new
entry = TkEntry.new(top, :state=>'readonly',
                         :textvariable=>var).grid(:row=>0, :column=>0)
TkButton.new(top, :text=>'Convert',
                  :command=>proc{var.value = 'hi'}).grid(:row=>1,
:column=>0)

Tk.mainloop
</code>

Thanks, that will work. I tried what I thought was the equivalent
(below) but it didn't work. The only real difference was that I
didn't pass my config params as function arguments.

<code>
require 'tk'

top = TkRoot.new
# variable used in entry field, written with button press
text_var = TkVariable.new
entry = TkEntry.new(top) {textvariable = text_var; grid('row'=>0,
'column'=>0)}

TkButton.new(top) {text 'Convert'; grid('row'=>1, 'column'=>0);
  command proc {
    # the next line does not show the string in the TkEntry
    text_var.value = "using variable"
  }
}
</code>

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4

Message-ID: <384777e0600994c870ed35b566f21dd0@ruby-forum.com>

Thanks, that will work. I tried what I thought was the equivalent
(below) but it didn't work. The only real difference was that I
didn't pass my config params as function arguments.

    (snip)

entry = TkEntry.new(top) {textvariable = text_var; grid('row'=>0,

                            ^^^^^^^^^^^^^^^^^^^^^^^
You define a local variable.
Please use "textvariable text_var" or "self.textvariable = text_var".

···

From: Mathew Cucuzella <kookjr@gmail.com>
Subject: Re: using TkEntry with copy/paste
Date: Tue, 8 Jun 2010 01:33:41 +0900
--
Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)

5

Hidetoshi NAGAI wrote:

You define a local variable.
Please use "textvariable text_var" or "self.textvariable = text_var".

Thanks, that fixed it.

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