"""all the tiny tk helper functions"""

from __future__ import nested_scopes
from Tkinter import *
from Tix import *
from types import StringType

def make_frame(parent):
    f = Frame(parent, bd=0)
    f.pack(side='left')
    return f

def bindkeys(root,key, func):
    root.bind(key, func)
    for w in root.winfo_children():
        w.bind(key, func)

def toplevelat(x,y,w=None,h=None):
    tl = Toplevel()
    if w and h:
        tl.wm_geometry("%dx%d+%d+%d" % (w,h,x,y))
    else:
        tl.wm_geometry("+%d+%d" % (x,y))
    return tl

def toggle_slider(s):
    if s.get() == 0:
        s.set(100)
    else:
        s.set(0)

# for lambda callbacks    
def printout(t):
    print t
    
def colorlabel(label):
    """color a label based on its own text"""
    txt=label['text'] or "0"
    lev=float(txt)/100
    low=(80,80,180)
    high=(255,55,050)
    out = [int(l+lev*(h-l)) for h,l in zip(high,low)]
    col="#%02X%02X%02X" % tuple(out)
    label.config(bg=col)

# TODO: get everyone to use this
def colorfade(low, high, percent):
    '''not foolproof.  make sure 0 < percent < 1'''
    out = [int(l+percent*(h-l)) for h,l in zip(high,low)]
    col="#%02X%02X%02X" % tuple(out)
    return col

def colortotuple(anytkobj, colorname):
    'pass any tk object and a color name, like "yellow"'
    rgb = anytkobj.winfo_rgb(colorname)
    return [v / 256 for v in rgb]

class Togglebutton(Button):
    """works like a single radiobutton, but it's a button so the
    label's on the button face, not to the side. the optional command
    callback is called on button set, not on unset. takes a variable
    just like a checkbutton"""
    def __init__(self,parent,variable=None,command=None,downcolor='red',**kw):

        self.oldcommand = command
        Button.__init__(self,parent,command=self.invoke,**kw)

        self._origbkg = self.cget('bg')
        self.downcolor = downcolor

        self._variable = variable
        if self._variable:
            self._variable.trace('w',self._varchanged)
            self._setstate(self._variable.get())
        else:
            self._setstate(0)

        self.bind("<Return>",self.invoke)
        self.bind("<1>",self.invoke)
        self.bind("<space>",self.invoke)

    def _varchanged(self,*args):
        self._setstate(self._variable.get())
        
    def invoke(self,*ev):
        if self._variable:
            self._variable.set(not self.state)
        else:
            self._setstate(not self.state)
        
        if self.oldcommand and self.state: # call command only when state goes to 1
            self.oldcommand()
        return "break"

    def _setstate(self,newstate):
        self.state = newstate
        if newstate: # set
            self.config(bg=self.downcolor,relief='sunken')
        else: # unset
            self.config(bg=self._origbkg,relief='raised')
        return "break"

if __name__=='__main__':
    root=Tk()
    root.tk_focusFollowsMouse()
    iv=IntVar()
    def cb():
        print "cb!"
    t = Togglebutton(root,text="testbutton",command=cb,variable=iv)
    t.pack()
    Entry(root,textvariable=iv).pack()
    root.mainloop()