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It all started innocently enough. The notebook didn't fit in my pocket, and my N93 was already there.

UI in Python using listbox

kevin_s2f | 10 July, 2007 00:57

I want the tasting journal application to open with a UI that presents two simple options:
  • record an experience
  • view past experiences
The easiest way that I’ve seen to do that in PyS60 is with a listbox control. The UI in PyS60 is implemented in the appuifw module, which according to the documentation available at sourceforge:
 
The appuifw module offers an interface to the S60 UI application framework. Figure 5.1 provides an
overview of the Python for S60 environment for UI application programming.
Note: The services of this interface may only be used in the context of the main thread, that is, the
initial thread of a UI application script.
 
So whether you are new to Python (like me) or just new to Python on S60, this module will be new to you. As I was downloading and installing the execution environment on the N93 and the SDK on my PC, I also downloaded and extracted the source files. Unzipping that package revealed a hidden treasure of example files that I found in directory …srcextrasexamples*.py. Three of the examples in that directory provide good UI overviews – I began with GUI_exaple_2.py, extracted all the peripheral material, and came up with a basic skeleton of a UI for the journal: a list box with two options. I posted that skeleton in the Wiki here.
 
Then I went in to the Wiki to find the most basic multimedia functionality – quickly snap a pic (here)  and record a track (here).  Inserting those snippets into the UI skeleton results in this code:
 
import e32
import appuifw
 
choices =[(u"New experience", "new"),
          (u"Add comment", "comment")]
choices_labels = [x[0] for x in choices]
 
def takepic(filename):
    import camera
    im = camera.take_photo() # use all default values
    im.save(filename)
   
 
def recordaudio(filename):
   import e32, audio
 
   print(u"Hello from inside recordaudio fn")
   s = audio.Sound.open(filename) # if file exists, append sound to end
   s.record() # start recording
   e32.ao_sleep(5) # do if for 5 seconds
   s.stop() # stop recording
 
 
   # the file is now created, ready to be played
   s.play()       
 
def handle_selection():
    index = lb.current()
    code = choices[index][1]
    lb.set_list([u"Please wait..."])
    if code == "new":
        appuifw.note(u"here is where we process a new experience", 'info')
        takepic (u"e:test.jpg")
        recordaudio (u"e:test.amr")       
       
    elif code == "comment":
        appuifw.note(u"here is where we add a comment", 'info')
        recordaudio (u"e:test.amr")
    else:
        appuifw.note(u"no valide code detected", 'info')
    lb.set_list(choices_labels)
 
def handle_add():
    pass 
 
def handle_delete():
    pass
 
def exit_key_handler():
    app_lock.signal()
 
lb = appuifw.Listbox(choices_labels, handle_selection)
 
old_title = appuifw.app.title
appuifw.app.title = u"Tasty Multimedia Journal"
appuifw.app.body = lb
appuifw.app.menu = [(u"Add new item", handle_add),
                    (u"Delete item", handle_delete)]
appuifw.app.exit_key_handler = exit_key_handler
 
app_lock = e32.Ao_lock()
app_lock.wait()
 
appuifw.app.title = old_title
 
Next steps:
  • Work with a more sophisticated image capture script  (here) which provides viewfinder functionality.
  • Control media filenames to associate audio tracks with the images they describe.

Python | Next | Previous | Comments (18) | Trackbacks (1)

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