# -*-coding: iso-8859-1-*-
# mk, 17.1.10

import Tkinter
import tkSimpleDialog

class Register(object):
    def __init__(self, canvas, x = 150, y = 30, b = 100, h = 80, name = 'r'):
        self.canvas = canvas
        self.OnChange = None
        self.name = name
        self.reg = canvas.create_rectangle(x,y,x+b,y+h,tag = name)
        self.wert = 123
        self.label = canvas.create_text(x+5, y+3, text = str(self.name),
                                        anchor = 'nw',
                                        font = ('Helvetica', '10'))
        self.txt = canvas.create_text(x+b/2, y+h/2, text = str(self.wert),
                                      anchor = 'center',
                                      font = ('Helvetica', '26'), fill = '#0000ff')
        canvas.tag_bind(self.txt,'<Button-1>',self.OnClick)      
        
    def OnClick(self, event):
        self.wert = tkSimpleDialog.askinteger('Register '+self.name+' setzen',
                                                    '0 .. 255',
                                                    minvalue = 0, maxvalue = 255)
        self.canvas.itemconfig(self.txt, text = str(self.wert))
        if self.OnChange != None:
            self.OnChange(self.name,self.wert)

    def setWert(self,wert):
        self.wert = wert
        self.canvas.itemconfig(self.txt, text = str(self.wert))

class Bus(object):
    def __init__(self, canvas, x = 150, y = 30, b = 20, l = 200, name = 'b'):
        self.canvas = canvas
        self.name = name
        self.oben = self.canvas.create_line(x,y,x+l,y, tag = name)
        self.unten = self.canvas.create_line(x,y+b,x+l,y+b, tag = name)
        self.wert = None
        self.txt = canvas.create_text(x+l/2, y+b/2, text = str(self.wert),
                                      anchor = 'center',
                                      font = ('Helvetica', '8'), fill = '#0000ff')
    def setWert(self,wert):
        self.wert = wert
        self.canvas.itemconfig(self.txt, text = str(self.wert))

class Pfeil(object):
    def __init__(self, canvas, OnChange = None, x = 50, y = 30, b = 40, l = 100,
                 name = 'p', o = 'n', farbe = '#00ff00'):
        self.canvas = canvas
        self.OnChange = OnChange
        self.name = name
        self.zustand = 0
        self.farbe = farbe
        self.farben = ['',self.farbe]
        d = b//4
        if o == 'n':
            self.pfeil = canvas.create_polygon(x+2*d,y,x,y+2*d,x+d,y+2*d,x+d,y+l,x+3*d,y+l,
                           x+3*d,y+2*d,x+4*d,y+2*d, outline = self.farbe, fill = '', tag = name)
        elif o == 'w':
            self.pfeil = canvas.create_polygon(x,y+2*d,x+2*d,y+4*d,x+2*d,y+3*d,x+l,y+3*d,
                           x+l,y+d,x+2*d,y+d,x+2*d,y, outline = self.farbe, fill = '', tag = name)
        elif o == 's':
            self.pfeil = canvas.create_polygon(x+2*d,y+l,x+4*d,y+l-2*d,x+3*d,y+l-2*d,x+3*d,y,
                           x+d,y,x+d,y+l-2*d,x,y+l-2*d, outline = self.farbe, fill = '', tag = name)
        elif o == 'e':
            self.pfeil = canvas.create_polygon(x+l,y+2*d,x+l-2*d,y,x+l-2*d,y+d,x,y+d,x,y+3*d,
                           x+l-2*d,y+3*d,x+l-2*d,y+4*d, outline = self.farbe, fill = '', tag = name)
        self.zustand = 0
        canvas.tag_bind(self.pfeil,'<Button-1>',self.OnClick)

    def OnClick(self, event):
        self.zustand = 1 - self.zustand
        self.canvas.itemconfig(self.pfeil,fill = self.farben[self.zustand])
        if self.OnChange != None:
            self.OnChange(self.name,self.zustand)

    def setZustand(self,wert):
        self.zustand = wert
        self.canvas.itemconfig(self.pfeil,fill = self.farben[self.zustand])
        
class View(Tkinter.Tk):
    def __init__(self):
        Tkinter.Tk.__init__(self)
        # Fenster
        self.title("Registertransfer 0")
        self.geometry('540x420')
        # Canvas
        self.c = Tkinter.Canvas(master=self,width=540,height=420,bg='white')
        self.c.place(x=0,y=0)
        # Register
        self.regA = Register(self.c, name = 'A', x = 50, y = 50, b = 100, h = 80)
        self.regB = Register(self.c, name = 'B', x = 350, y = 50, b = 100, h = 80)
        self.regC = Register(self.c, name = 'C', x = 250, y = 290, b = 100, h = 80)
        # Bus
        self.bus = Bus(self.c, x = 20, y = 200, b = 20, l = 500, name = 'Bus')
        # Pfeile
        self.p1 = Pfeil(self.c, x = 65, y = 135, l = 60, b = 30,
                        o = 'n', farbe = '#00ff00', name = '1')
        self.p2 = Pfeil(self.c, x = 105, y = 135, l = 60, b = 30,
                        o = 's', farbe = '#ff0000', name = '2')
        self.p3 = Pfeil(self.c, x = 365, y = 135, l = 60, b = 30,
                        o = 'n', farbe = '#00ff00', name = '3')
        self.p4 = Pfeil(self.c, x = 405, y = 135, l = 60, b = 30,
                        o = 's', farbe = '#ff0000', name = '4')
        self.p5 = Pfeil(self.c, x = 265, y = 225, l = 60, b = 30,
                        o = 's', farbe = '#00ff00', name = '5')
        self.p6 = Pfeil(self.c, x = 305, y = 225, l = 60, b = 30,
                        o = 'n', farbe = '#ff0000', name = '6')


if __name__ == "__main__":        
    # Test-Callbacks
    def regChange(name,wert):
        print 'Register '+name+' wurde auf '+str(wert)+' geändert.'
    def arrChange(name,wert):
        print 'Pfeil '+name+' wurde auf '+str(wert)+' geändert.'
    # 
    v = View()
    v.regA.OnChange = regChange
    v.regB.OnChange = regChange
    v.regC.OnChange = regChange
    v.p1.OnChange = arrChange
    v.p2.OnChange = arrChange
    v.p3.OnChange = arrChange
    v.p4.OnChange = arrChange
    v.p5.OnChange = arrChange
    v.p6.OnChange = arrChange
    v.mainloop()