Basic RubyTk questions

I have a Mac OS X system. I wrote a Ruby program that uses RubyTk to
display a TkLabel. It works, but I’d like a bit more control over how
it looks. Here’s the code minus the non-Tk stuff that isn’t relevant
to my questions:

require ‘tk’

answer = ‘test’
TkLabel.new do
text answer
foreground ‘yellow’
background ‘black’

place(‘x’ => 400, ‘y’ = 400)

pack(‘padx’ => 15, ‘pady’ => 15)
end

def timer_loop3
exit
end
TkAfter.new(3000, # milliseconds
-1, # ?
proc{timer_loop3} # what to call when the timer expires
).start

Tk.mainloop

The program displays a label for 3 seconds and exits, as intended,
but…

  1. How do I control the placement of the label on the screen? It now
    apppears
    near the upper left-hand corner. I tried “place” (commented out)
    with no
    luck.
  2. How can I make the label appear on top of other windows? It naw
    appears
    “under” other windows, so I only see the label if I keep the
    upper-left part
    of my screen free of other windows.
  3. Is there a way to remove the borders? I don’t need the title bar.
  4. I use this as a Mac OS X service, dufined with ThisService, a great
    little
    program. When I run it as a service, two windows appear. One is
    titled “tk”
    and the other is the same as what I see when I run the program from
    the
    command line. Can I get rid of the “tk” window?
  5. Of course, is there a better way to do this?

– Pete

You are not very clear of what exaclty you intend to do, place what,
where?, but I think Morton’s example can help you alot. Anyway if your
target is only MacOS X try RubyCocoa
(http://blog.8thlight.com/articles/2007/08/13/rubycocoa-tutorial). I
think you can use the XCode interface builder in that case.
Regards.

On Aug 17, 2007, at 11:45 AM, Pete Siemsen wrote:

I have a Mac OS X system. I wrote a Ruby program that uses RubyTk to
display a TkLabel. It works, but I’d like a bit more control over how
it looks. Here’s the code minus the non-Tk stuff that isn’t relevant
to my questions:

  1. Of course, is there a better way to do this?

Now that has has set me straight on how to use the osax library, I
can suggest another idea:

#! /usr/bin/env ruby require "osax"

SEC = 3 # display duration

std_adds = OSAX::osax(nil, “System Events”)
std_adds.display_alert(“This is a test”,
:message => “This is only a test”,
:giving_up_after => SEC,
:as => :warning)

Using OSA scripting additions has two virtues:

  1. Much simpler to use than Ruby/Tk (once you know what library to
    require :).
  2. As far as I can tell, the alert will always pop-up on top of any
    other window that might be present on the screen.

If all you want to do is pop-up an short message every now and then,
this may work for you.

Regards, Morton

On Aug 17, 2007, at 11:45 AM, Pete Siemsen wrote:

foreground ‘yellow’
background ‘black’

place(‘x’ => 400, ‘y’ = 400)

pack(‘padx’ => 15, ‘pady’ => 15)
end

def timer_loop3
exit
end
TkAfter.new(3000, # milliseconds
-1, # ?

The -1 requests an indefinite number of timeout events. Since you are
going to exit on the first timeout, I suggest using 1 here, but it
doesn’t really matter.

near the upper left-hand corner. I tried “place” (commented
out) with no
luck.

The ‘place’ method affects the geometry of a widget within its
container. It does not affect the placement of the window containing
the widget on the screen.

  1. How can I make the label appear on top of other windows? It now
    appears
    “under” other windows, so I only see the label if I keep the
    upper-left part
    of my screen free of other windows.

The following ought to fix it, but it doesn’t.

root.focusmodel(:active)
root.focus(true)

This appears to be a problem with Tk. I don’t know a work-around.

  1. Is there a way to remove the borders? I don’t need the title bar.

The borders, yes. The title bar I don’t know how to remove.

  1. I use this as a Mac OS X service, defined with ThisService, a
    great little
    program. When I run it as a service, two windows appear. One
    is titled “tk”
    and the other is the same as what I see when I run the program
    from the
    command line. Can I get rid of the “tk” window?

If you watch carefully, sometimes you will see this window appear
momentarily even when you run from the command line. I don’t know why
it persists when you run your script as a service.

  1. Of course, is there a better way to do this?

There’s always a better way to do something with Ruby :slight_smile: The
following is the best I can do with Ruby/Tk. I don’t know if you will
think it’s good enough, but it solves some of your problems.

#! /usr/bin/ruby -w require 'tk'

SEC = 3 # display duration in seconds

TkLabel.new do
text ‘Hello, World!’
font “HelveticaBold 36”
foreground ‘yellow’
background ‘black’
pack(:fill => :both, :expand => true)
end

root = Tk.root
root.title(’’) # suppress title (title bar remains)

Set initial window geometry; i.e., size and placement

win_y, win_w, win_h = 50, 300, 80
win_x = (root.winfo_screenwidth - win_w) / 2 # center on screen
root.geometry("#{win_w}x#{win_h}+#{win_x}+#{win_y}")

Suppress resizing window

root.resizable(false, false)

One-shot timer

TkTimer.new(SEC * 1000, 1) { root.destroy }.start

Tk.mainloop

This may be a situation where Ruby/Tk just won’t cut it. The better
way you are looking for may require using a GUI library other than
Ruby/Tk.

Regards, Morton

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