import io, stage, Subs, Patch, ExternalInput

        self.slidermapper = ExtSliderMapper(mapping_tl, self.scalelevels, 

                ExternalInput.ExternalSliders())

            self.scalelevels[name].set(val)

class ExtSliderMapper(Frame):

    def __init__(self, parent, sliderlevels, sliderinput, filename='slidermapping',

                 numsliders=4):

        'Slider levels is scalelevels, sliderinput is an ExternalInput object'

        Frame.__init__(self, parent)

        self.parent = parent

        self.sliderlevels = sliderlevels

        self.sliderinput = sliderinput

        self.filename = filename

        self.numsliders = numsliders

        self.file = None

        # self.setup()

    def setup(self):

        self.subnames = self.sliderlevels.keys()

        self.subnames.sort()

        self.presets = {}

        self.load_presets()

        self.current_mapping_name = StringVar()

        self.current_mapping = []

        self.attached = []

        self.levels_read = []

        for i in range(self.numsliders):

            self.current_mapping.append(StringVar())

            self.attached.append(BooleanVar())

            self.levels_read.append(DoubleVar())

        self.reallevellabels = []

        self.draw_interface()

    def load_presets(self):

        self.file = open(self.filename, 'r')

        lines = self.file.readlines()

        for l in lines:

            tokens = l[:-1].split('\t')

            name = tokens.pop(0)

            self.presets[name] = tokens

        self.file.close()

    def save_presets(self):

        self.file = open(self.filename, 'w')

        self.file.seek(0)

        preset_names = self.presets.keys()

        preset_names.sort()

        for p in preset_names:

            s = '\t'.join([p] + self.presets[p]) + '\n'

            self.file.write(s)

        self.file.close()

    def load_scalelevels(self):

        for m, rll in zip(self.current_mapping, self.reallevellabels):

            try:

                v = self.sliderlevels[m.get()]

                rll.configure(textvariable=v)

            except KeyError:

                pass

    def get_levels(self):

        'To be called by changelevels, I think'

        if not self.current_mapping_name: return {}

        if not self.sliderinput: return {}

        self.load_scalelevels()

        rawlevels = self.sliderinput.get_levels()

        for rawlev, levlabvar in zip(rawlevels, self.levels_read):

            levlabvar.set(rawlev)

        outputlevels = {}

        return dict([(name.get(), lev) 

            for name, lev, att in zip(self.current_mapping, 

                                      rawlevels, 

                                      self.attached) 

            if att.get()])

    def draw_interface(self):

        self.reallevellabels = []

        subchoiceframe = Frame(self)

        for i, mapping, isattached, lev in zip(range(self.numsliders), 

                                               self.current_mapping, 

                                               self.attached,

                                               self.levels_read):

            f = Frame(subchoiceframe)

            # Label(f, text="Slider %d" % (i+1)).pack(side=LEFT)

            c = ComboBox(f, variable=mapping)

            for s in self.subnames:

                c.slistbox.listbox.insert(END, s)

            c.entry.configure(width=12)

            statframe = Frame(f)

            Checkbutton(statframe, variable=isattached, 

                text="Attached").grid(columnspan=2, sticky=W)

            Label(statframe, text="Input", fg='red').grid(row=1, sticky=W)

            Label(statframe, textvariable=lev, fg='red', width=5).grid(row=1, column=1)

            Label(statframe, text="Real").grid(row=2, sticky=W)

            l = Label(statframe, text="N/A", width=5)

            l.grid(row=2, column=1)

            self.reallevellabels.append(l)

            statframe.pack(side=BOTTOM, expand=1, fill=X)

            c.pack()

            f.pack(side=LEFT)

        subchoiceframe.pack()

        presetframe = Frame(self)

        Label(presetframe, text="Preset:").pack(side=LEFT)

        self.presetcombo = ComboBox(presetframe, variable=self.current_mapping_name, 

                                    editable=1, command=self.apply_preset)

        self.draw_presets()

        self.presetcombo.pack(side=LEFT)

        Button(presetframe, text="Add", padx=0, pady=0, 

                command=self.add_preset).pack(side=LEFT)

        Button(presetframe, text="Delete", padx=0, pady=0, 

                command=self.delete_preset).pack(side=LEFT)

        presetframe.pack(side=BOTTOM)

    def apply_preset(self, preset):

        if not preset: return

        mapping = self.presets.get(preset)

        if not mapping: return

        for name, var, att in zip(mapping, self.current_mapping, self.attached):

            var.set(name)

            att.set(0) # detach all sliders

    def delete_preset(self, *args):

        del self.presets[self.current_mapping_name.get()]

        self.presetcombo.slistbox.listbox.delete(0, END)

        self.draw_presets()

        self.save_presets()

    def add_preset(self, *args):

        self.presets[self.current_mapping_name.get()] = [m.get() 

                for m in self.current_mapping]

        self.presetcombo.slistbox.listbox.delete(0, END)

        self.draw_presets()

        self.save_presets()

    def draw_presets(self):

        preset_names = self.presets.keys()

        preset_names.sort()

        for p in preset_names:

            self.presetcombo.slistbox.listbox.insert(END, p)

if __name__ == '__main__':

    print "testing external sliders"

    root = Tk()

    fakesliderlevels = dict([('sub%d' % n, DoubleVar()) for n in range(12)])

    esm = ExtSliderMapper(root, fakesliderlevels, None)

    esm.pack()

    mainloop()