This morning I ported an example found at Blender's Python API documentation to use Scocca instead. The original code looks like this:
import Blender
from Blender import Draw, BGL
mystring = ""
mymsg = ""
toggle = 0
def event(evt, val): # the function to handle input events
global mystring, mymsg
if not val: # val = 0: it's a key/mbutton release
if evt in [Draw.LEFTMOUSE, Draw.MIDDLEMOUSE, Draw.RIGHTMOUSE]:
mymsg = "You released a mouse button."
Draw.Redraw(1)
return
if evt == Draw.ESCKEY:
Draw.Exit() # exit when user presses ESC
return
elif Draw.AKEY <= evt <= Draw.ZKEY: mystring += chr(evt)
elif evt == Draw.SPACEKEY: mystring += ' '
elif evt == Draw.BACKSPACEKEY and len(mystring):
mystring = mystring[:-1]
else: return # no need to redraw if nothing changed
Draw.Redraw(1)
def button_event(evt): # the function to handle Draw Button events
global mymsg, toggle
if evt == 1:
mymsg = "You pressed the toggle button."
toggle = 1 - toggle
Draw.Redraw(1)
def gui(): # the function to draw the screen
global mystring, mymsg, toggle
if len(mystring) > 90: mystring = ""
BGL.glClearColor(0,0,1,1)
BGL.glClear(BGL.GL_COLOR_BUFFER_BIT)
BGL.glColor3f(1,1,1)
Draw.Toggle("Toggle", 1, 10, 10, 55, 20, toggle,"A toggle button")
BGL.glRasterPos2i(72, 16)
if toggle: toggle_state = "down"
else: toggle_state = "up"
Draw.Text("The toggle button is %s." % toggle_state, "small")
BGL.glRasterPos2i(10, 230)
Draw.Text("Type letters from a to z, ESC to leave.")
BGL.glRasterPos2i(20, 200)
Draw.Text(mystring)
BGL.glColor3f(1,0.4,0.3)
BGL.glRasterPos2i(340, 70)
Draw.Text(mymsg, "tiny")
Draw.Register(gui, event, button_event) # registering the 3 callbacks
After porting it to use my system it looks like this (note that I did not care about the layout, just functionality):
# -*- coding: utf-8 -*-
from Blender import Draw
from scocca.frontend.blender.elements import Label, ToggleButton
from scocca.frontend.blender.window import Window
# TODO: add size for Label (at the best case it would be totally dynamic!) and use PyFTGL for rendering?
window = Window(bg_color='blue')
toggle_status_label = Label(parent=window,
x=72, y=0, color='orange')
mouse_status_label = Label(parent=window,
x=340, y=70, color='white')
help_text = Label(parent=window, x=10, y=200, color='white')
help_text.label = 'Type letters from a to z, ESC to leave'
my_string_text = Label(parent=window, x=20, y=230, color='white')
toggle = ToggleButton(parent=window, label='Toggle',
x=10, y=10, width=55, height=20,
tooltip='A toggle button')
def toggle_pressed():
toggle_state = 'down' if toggle.value else 'up'
toggle_status_label.label = 'The toggle button is %s.' % toggle_state
toggle.press(toggle_pressed)
def add_to_my_string():
my_string_text.label += window.event_manager.last_pressed_key # XXX: ok???
window.bind_hotkey('any_character_key', 'press', add_to_my_string)
def add_space():
my_string_text.label += ' '
window.bind_hotkey('space', 'press', add_space)
def remove_from_my_string():
my_string_text.label = my_string_text.label[:-1]
window.bind_hotkey('backspace', 'press', remove_from_my_string)
def released_mouse_button():
mouse_status_label.label = 'You released a mouse button.'
window.bind_hotkey('any_mouse_button', 'release', released_mouse_button)
def pressed_mouse_button():
mouse_status_label.label = 'You pressed a mouse button.'
window.bind_hotkey('any_mouse_button', 'press', pressed_mouse_button)
window.bind_hotkey('esc', 'press', Draw.Exit)
window.run()
There are still some issues to fix in my version but even as it is it should give some idea of where the differences lie in. Take a good look at the abstraction level and code flow. If you have any ideas how to tweak it further, let me know.
The Blender frontend is pretty much testable. It has some rough spots (font rendering does not scale, missing some wrapping (all menus ie.), layout/style system isn't nice) but that should not stop you from building something simple with it.
Note that I got rid of a couple of now redundant lines (color definitions) in above example. This is because I integrated GrapeFruit color module in Scocca.
