Changing the caption of a checkbox.

Coding Python Support
1

Hi All,
I am trying to make a simple python GUI that has a checkbox. When the user clicks on the check box, it changes it’s caption from “on” to “off”.


chkDefault = Draw.Toggle("On", 200, 190, 350, 30, 20, chkDefault.val, "Click to check.")

For some reason, chkDefaul.val does not work. I also tried .state and that does not work.
In my event handler I have something like this:


 #Checkboxes start at 200.
 elif (evt == 200): 
  if (chkDefault == 1):
   chkDefault = 0
  else:
   chkDefault = 1
  Draw.Redraw(1)

What I also want i something like this: (VB pseudo code)


 #Checkboxes start at 200.
 elif (evt == 200): 
  if (chkDefault == 1):
   chkDefault = 0
   chkDefault.caption = "Off"
  else:
   chkDefault = 1
   chkDefaultCaption = "On"
  Draw.Redraw(1)
2

couldn’t you do something like:


#in your drawing function
captions = ["off", "on"] # list with the names

# ...

chkDefault = Draw.Toggle("On", 200, 190, 350, 30, 20, captions[chkDefault.val], "Click to check.")

Haven’t tested it, but it takes advantage of the int-values of the booleans. At least IIRC that’s how it works.

3

What you’d want to do is something like (mix of pseudo code and real python, sorry…)


#Untested Code!
chkCaption = "Off" #Default caption
chkDefault= Draw.Create(0)

def bevents(evt, val):
     ...
     If Toggle Event:
          if not chkDefault.val:
               chkCaption = "Off"
          else:
               chkCaption = "On"
          Draw.Redraw(1)
     ...

...later in your GUI code...
chkDefault = Draw.Toggle(chkCaption, ...your parameters for size/placement..., chkDefault.val, "Tool Tip")

I believe that chkCaption and chkDefault need to be global variables, as well, but its worth a try with them as normal ones as well.

4

Sorry, my suggestion above is incorrect. Here’s a tested version:


from Blender import Draw

chkDefault = Draw.Create(True) # put your default here

def draw():	 #your drawing function
	global chkDefault
	captions = ["off", "on"] # list of caption strings

	# ...

	chkDefault = Draw.Toggle( captions[chkDefault.val], 200, 190, 350, 30, 20, chkDefault.val, "Click to check." )
	
def event(evt,val):  # Define mouse and keyboard press events
	if evt == Draw.ESCKEY: # Example if esc key pressed
		Draw.Exit()		# then exit script
		return				 # return from the function

def button(evt):	 # Define what to do if a button is pressed
	#some code here, but event 200 not necessary to handle
	Draw.Redraw()

#
# 	Run!
#

Draw.Register(draw,event,button)

I’d add that you don’t need the code in your event handler - toggling on and off happens automatically. So leave out all your toggle boxes that you don’t want to directly trigger something else or behave different from default.

5

Thanks for the feedback.
Here is my “Empty Script” for starting out a project.


#!BPY
"""
Name: '(ap) Empty'
Blender: 244
Group: 'Wizards'
Tooltip: 'A simple empty script to get you going.'
"""
__author__ = ["Atomic Perception"]
__version__ = "0.0.2"
__name__ = "Empty"
############################################################################
# Import Stuff
############################################################################
import Blender
import math
from Blender.Draw import *
from Blender.BGL import *
from Blender import Mathutils
from Blender.Mathutils import *
from Blender import *
from math import *
import sys, traceback
############################################################################
# Globals     
############################################################################
name  = __name__
version = __version__
createdObjs = []
#When you add another variable to hold the default value from a gui element
#remember to add a global reference to the "gui_events"  and "gui" defs below.
numbSteps = Create(2) #Holds the default value for the slider.
chkDefault = Create(1) #Holds the default value for the checkbox.
############################################################################
# Console init greetings.
############################################################################
print "Initializing..."
print "" + name + " - version: " + version 
print ""
############################################################################
# GUI    
############################################################################
def gui():
 global chkDefault, numbSteps
 glClearColor(0.5,0.5,0.5, 0.0)
 glColor3f(0.0,0.0,0.0,)
 glClear(GL_COLOR_BUFFER_BIT)
 glRasterPos2i(10, 410)
 Draw.Text(name + " - V" + version, "large")
 numbSteps = Slider("Number: ", 100, 10, 260, 290, 20, numbSteps.val, 1, 100, 1, "Number of some kind of units.")
 glRasterPos2i(117, 355)
 Draw.Text("Checkbox:")
 captions = ["off", "on"]
 chkDefault = Draw.Toggle(captions[chkDefault.val], 200, 190, 350, 30, 20, chkDefault.val, "Click to check.")
 #glRasterPos2i(117, 355)
 #Draw.Text("Click To Generate:")
 Button("Generate", 1, 10, 10, 230, 40, "Execute code!")
 Button("Exit", 2, 250, 10, 50, 40, "Exit script")
############################################################################
# GUI Event Handlers  
############################################################################
def gui_events(eventIndex):
 global chkDefault, numbSteps
 #Buttons start at 1.
 if (eventIndex == 1):
  doCode()
 elif (eventIndex == 2):
  print "
End code...
"
  Exit()
 
 #Sliders start at 100.
 elif (eventIndex == 100):
  print "
numbSteps:",numbSteps
 
 #Checkboxes start at 200.
 elif (eventIndex == 200): 
  if (chkDefault == 1):
   print "
On
"
  else:
   print "
Off
"
 Draw.Redraw() 
############################################################################
# system Event Handlers
############################################################################
def sys_events(eventIndex, value):
 if (eventIndex == ESCKEY and not value):
  Exit()
 
############################################################################
# doCode() 
############################################################################
def doCode():
 try:
  print "
Executing code...
"
 except:
  print "
Error...
"
  traceback.print_exc(file=sys.stdout)
 
 Draw.Redraw(1)
 
############################################################################
# register handlers.
############################################################################
Register(gui, sys_events, gui_events)