Ruby TK how to receive input from user? - ruby

Question

I am new to Ruby and I would like to receive input from users with Ruby TK. The Internet has too little information about this. So I am here to search for a solution. Below is the current method that I am using.
TkSpinbox.new(left) do
to 100
from 1
value = TkVariable.new()
increment value += 1
command (proc{
puts value
})
pack("side" => "bottom", "padx"=> "50", "pady"=> "54")
end
I have no idea how to get the value inside the spinbox and return it to another place. This is the screenshot of the GUI.

Answer 1

There are a couple of little changes you can make to that code snippet which will let you access the spinbox value correctly:
The increment method takes one argument, the amount to increment the value by every time you click a button. So you can replace increment value += 1 with just increment 1.
You don't need the value = TkVariable.new() line, because the TkSpinbox keeps track of its value itself. (If you did want to set an initial value, you would use e.g. self.value = 10.)
After making those changes, this is the final code snippet:
TkSpinbox.new(left) do
to 100
from 1
increment 1
# Equivalent to your proc({...}) usage here, but this is better Ruby style
command do
puts value
end
pack("side" => "bottom", "padx"=> "50", "pady"=> "54")
end
And here's how it looks when you click the increment button several times:
To use the value from some other control like a button, you can assign your TkSpinbox to a variable and access its value from another command block:
# Assign spinbox to a variable named `spinbox`
spinbox = TkSpinbox.new(left) do
to 100
from 1
increment 1
command do
puts value
end
pack("side" => "bottom", "padx"=> "50", "pady"=> "54")
end
TkButton.new(left) do
text "Do something with the value"
command do
# Now `spinbox` is usable from other controls
# (The value may be a string, so we use .to_i to convert to an integer)
puts spinbox.value.to_i * 100
end
pack("side" => "top")
end