Re: Feedback messages to user using Tk

Thanks Morton, however I want the message to change when the program
produces feedback for the user, i.e. the program is zipping up files, as
these files are zipped I should like to display the incrementing
percentage complete. A user will not be clicking a button each time a
file is added, unfortunately; 2,500 files would probably cause serious
RSI!

Do you know how to update the message without a command/bind event?
Another part of the program will be setting the message, like puts.

Ta

Gem

On Sep 27, 2006, at 8:24 AM, Cameron, Gemma (UK) wrote:

Thanks Morton, however I want the message to change when the
program produces feedback for the user, i.e. the program is zipping
up files, as these files are zipped I should like to display the
incrementing percentage complete. A user will not be clicking a
button each time a file is added, unfortunately; 2,500 files would
probably cause serious RSI!

Do you know how to update the message without a command/bind event?
Another part of the program will be setting the message, like puts.

The fact that I used a button to trigger the change doesn’t mean that
a user action is required to effect the change. The btn_action method
is just an ordinary instance method of TestWindow. Any instance
method of the class can do what it does. Also, it can be called by
any object that possesses a reference to the window class.

However, from what you describe above, I think you might be
interested in the Feedback iwidget. Here is an example of its use:

#! /usr/bin/ruby -w # Author: Morton G. # # Date: September 6, 2006 # # Progress Indicator 2

require ‘tk’
require ‘tkextlib/iwidgets’

DEBUG = []

begin
# Build a window containing a progress indicator and a button.
root = TkRoot.new {title ‘Ruby/Tk Progress Indicator’}
fb = Tk::Iwidgets::Feedback.new(root) {
steps 20
labeltext “Click the Button”
barcolor ‘red’
barheight 20
troughcolor ‘gray90’
}
fb.component_widget(‘trough’).
configure(‘relief’=>‘ridge’, ‘borderwidth’=>4)
fb.component_widget(‘bar’).
configure(‘relief’=>‘sunken’, ‘borderwidth’=>5)
fb.pack(‘fill’=>‘x’, ‘padx’=>15, ‘pady’=>10)
btn = TkButton.new(root) {
text “Do Something”
command {btn.action}
}
btn.pack(‘pady’=>10)
btn.instance_variable_set(:@fb, fb)
# Starts the timer going when the button is clicked.
def btn.action
self.state = ‘disable’ # Strange – explicit receiver required
# Set the timer to trigger at 200 m-sec intervals, once for each
# progress step.
$timer = TkTimer.start(200, @fb.steps) {@fb.update}
end
fb.instance_variable_set(:@btn, btn)
# Run on each timer tick.
def fb.update
labeltext = “Doing Something …”
step
# loop_rest returns remaining trigger intervals.
unless $timer.loop_rest > 1
labeltext = “Click the Button”
reset
@btn.state = ‘normal’
end
end

# Set initial window geometry; i.e., size and placement.
win_w, win_h = 300, 160
# root.minsize(win_w, win_h)
win_l = (TkWinfo.screenwidth('.') - win_w) / 2
root.geometry("#{win_w}x#{win_h}+#{win_l}+50")

# Set resize permissions.
root.resizable(false, false)

# Make Cmnd+Q work as expected.
root.bind('Command-q') {Tk.root.destroy}

Tk.mainloop

ensure
puts DEBUG unless DEBUG.empty?
end

Again, don’t get fooled by there being buttons involved in these
examples. The buttons are just artifacts needed to keep the examples
simple.

Regards, Morton

Morton G. wrote:

The fact that I used a button to trigger the change doesn’t mean that
a user action is required to effect the change. The btn_action method
is just an ordinary instance method of TestWindow. Any instance
method of the class can do what it does. Also, it can be called by
any object that possesses a reference to the window class.

However, from what you describe above, I think you might be
interested in the Feedback iwidget. Here is an example of its use:

Thanks for both of the examples. It will take me a while to pick my way
through the code and understand it properly. But I ran both and read
through once so I think there is already things I can use.

Thanks a lot. Im finding this project very slow going so examples like
this help a lot!

Mary

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