How to use progressbar indeterminate in ruby/tk? - ruby

Question

I cant figure out how the progressbar in ruby/tk works in indeterminate mode.
I can get the progressbar showing but it will not move.
an example if I just use this line in my code
progressBar.start
If I only have that line the progressbar will be showing and moving as it should.
But if i add line of code under it it will not execute. I had the impression that the .start method of progressbar starts it and the method stop stops it and in between you have the code that should be executed and the progressbar show until it sees the stop.
But if i do this
progressBar.start
# some code (a loop that takes a long while to execute)
progressBar.stop
the progressbar is not beeing shown until the code in between is finished? I thought that was why you wanted the progressbar?
What am I not understanding here.
Thx for you help but why is not this working. Its just a stupid test. But i am doing somthing similar in the real program. If I write this code the progressbar will not run as it should but instead after the Devil img loop is done?
Dir.chdir("c:/temp")
bilder = Dir.glob("*.jpg")+
bilder = Dir.glob("*.png")+
bilder = Dir.glob("*.gif")
puts bilder
root = TkRoot.new { title 'Progressbar Demo' }
content = Tk::Frame.new(root) {}.grid(:sticky =>'new')
progress = Tk::Tile::Progressbar.new(content:mode=>'indeterminate':orient=>:horizontal)
progress.pack
Thread.new do
progress.start
i=0
while i < bilder.length
Devil.with_image(bilder[i]) do |img|
img.thumbnail2(150)
img.save("thumbnail_"+ bilder[i])
end
i=i+1
end
progress.stop
end
Tk.mainloop

Answer 1

It is a threading problem.
This code should work. Tested on Win7, Ruby 1.9.3
require 'tk'
root = TkRoot.new { title 'Progressbar Demo' }
progress = Tk::Tile::Progressbar.new(root, :mode=>'determinate', :orient=>:horizontal, :maximum=>100)
progress.pack
Thread.new do
99.times do |i|
progress.step(1) #or progress.value = i
puts i
sleep 0.1
end
end
Tk.mainloop
For your indeerminate version that is
require 'tk'
root = TkRoot.new { title 'Progressbar Demo' }
progress = Tk::Tile::Progressbar.new(root, :mode=>'indeterminate', :orient=>:horizontal)
progress.pack
Thread.new do
progress.start
99.times do |i|
puts i
sleep 0.1
end
progress.stop
end
Tk.mainloop
Here an example how to do it wiht green shoes
require 'green_shoes'
Shoes.app do
#p = progress
#animate = animate do |percent|
#animate.stop if percent > 99
puts percent
#p.fraction = percent.to_f / 100
end
end
EDIT: based on the added question here a reworked more rubylike version of your script
unfortionatly i had to comment out the Devil lines cause i can't get this gem to work (loaderror)
require 'tk'
# require 'devil'
bilder = Dir['c:/temp/*.{jpg,png,gif}']
root = TkRoot.new { title 'Progressbar Demo' }
progress = Tk::Tile::Progressbar.new(root, :mode=>'indeterminate', :orient=>'horizontal')
progress.pack
STDOUT.sync = true
Thread.new do
progress.start
bilder.each do |bild|
puts bild
sleep 0.5
# Devil.with_image(bild) do |img|
# img.thumbnail2(150)
# img.save("thumbnail_#{bild}")
# end
end
progress.stop
end
Tk.mainloop
LAST EDIT:
here a working example with mini_magick since devil doesn't work on any of my pc's and gives problem with TK
['mini_magick','tk','fileutils'].each(&method(:require))
bilder = Dir['c:/test/*.{jpg,png,gif}']
root = TkRoot.new { title 'Progressbar Demo' }
progress = Tk::Tile::Progressbar.new(root, :mode=>'indeterminate', :orient=>'horizontal')
progress.pack
STDOUT.sync = true
def generate file, out, type
image = MiniMagick::Image.open file
if type == :thumb
image.resize "92x92"
elsif type == :slide
image.resize "800x600"
end
image.write out
end
Thread.new do
progress.start
bilder.each do |bild|
puts bild
generate bild, bild+'.thumb.jpg', :thumb
end
progress.stop
progress.destroy
end
Tk.mainloop