components_2.py

Python.Tkinter编程实例代码多多学习

# Components_2.py for chapter 10 examples

from Tkinter   import *
from GUICommon import *
from Common    import *

class LED(GUICommon): 
    def __init__(self, master=None, width=25, height=25, 
                 appearance=FLAT,
                 status=STATUS_ON, bd=1, 
                 bg=None, 
                 shape=SQUARE, outline="",
                 blink=0, blinkrate=1,
                 orient=POINT_UP,
                 takefocus=0):
        # preserve attributes
        self.master       = master
        self.shape        = shape
        self.Colors       = [None, Color.OFF, Color.ON,
                             Color.WARN, Color.ALARM, '#00ffdd']
        self.status       = status
        self.blink        = blink
        self.blinkrate    = int(blinkrate)
        self.on           = 0
        self.onState      = None

        if not bg:
            bg = Color.PANEL

        ## Base frame to contain light
        self.led_frame=Frame(master, relief=appearance, bg=bg, bd=bd, 
                             takefocus=takefocus)

        basesize = width
        d = center = int(basesize/2)

        if self.shape == SQUARE:
            self.canvas=Canvas(self.led_frame, height=height, width=width, 
                               bg=bg, bd=0, highlightthickness=0)

            self.light=self.canvas.create_rectangle(0, 0, width, height,
                                                    fill=Color.ON)
        elif self.shape == ROUND:
            r = int((basesize-2)/2)
            self.canvas=Canvas(self.led_frame, width=width, height=width, 
                               highlightthickness=0, bg=bg, bd=0)
            if bd > 0:
                self.border=self.canvas.create_oval(center-r, center-r, 
                                                    center+r, center+r)
                r = r - bd
            self.light=self.canvas.create_oval(center-r-1, center-r-1, 
                                               center+r, center+r, 
                                               fill=Color.ON,
                                               outline=outline)
        else:  # Default is an ARROW
            self.canvas=Canvas(self.led_frame, width=width, height=width, 
                               highlightthickness=0, bg=bg, bd=0)
            x = d
            y = d
            VL = ARROW_HEAD_VERTICES[orient] 
            self.light=self.canvas.create_polygon(eval(VL[0]),
                              eval(VL[1]), eval(VL[2]), eval(VL[3]),
                              eval(VL[4]), eval(VL[5]), eval(VL[6]),
                              eval(VL[7]), outline = outline)

        self.canvas.pack(side=TOP, fill=X, expand=NO)
        self.update()

    def update(self):
        # First do the blink, if set to blink
        if self.blink:
            if self.on:
                if not self.onState:
                    self.onState = self.status
                self.status  = STATUS_OFF
                self.on      = 0                            
            else:
                if self.onState:
                    self.status = self.onState     # Current ON color
                self.on = 1

        # Set color for current status
        self.canvas.itemconfig(self.light, fill=self.Colors[self.status])

        self.canvas.update_idletasks()

        if self.blink:
            self.led_frame.after(self.blinkrate * 1000, self.update)

class Screen(GUICommon):
     def __init__(self, master, bg=Color.PANEL, height=1, width=1):
         self.screen_frame = Frame(master, width=width, height=height,
                                   bg=bg, bd=0)
         self.base = bg
         self.set_colors(self.screen_frame)
         radius = 4         # radius of an air hole
         ssize  = radius*3  # spacing between holes
         
         rows = int(height/ssize)
         cols = int(width/ssize)
                
         self.canvas = Canvas(self.screen_frame, height=height, width=width, 
                               bg=bg, bd=0, highlightthickness=0)

         self.canvas.pack(side=TOP, fill=BOTH, expand=NO)

         y = ssize - radius
         for r in range(rows):
             x0 = ssize -radius
             for c in range(cols):
                 x = x0 + (ssize*c)
                 self.canvas.create_oval(x-radius, y-radius,
                                         x+radius, y+radius,
                                         fill=self.dbase,
                                         outline=self.lbase)
             y = y + ssize

class PowerConnector:
    def __init__(self, master, bg=Color.PANEL):
        self.socket_frame = Frame(master, relief="raised", width=60,
	                  height=40,  bg=bg, bd=4)
	inside=Frame(self.socket_frame, relief="sunken", width=56,
                     height=36, bg=Color.INSIDE, bd=2)
	inside.place(relx=.5, rely=.5, anchor=CENTER)
	ground=Frame(inside, relief="raised", width=6, height=10,
		          bg=Color.CHROME, bd=2)
	ground.place(relx=.5, rely=.3, anchor=CENTER)
	p1=Frame(inside, relief="raised", width=6, height=10,
		          bg=Color.CHROME, bd=2)
	p1.place(relx=.25, rely=.7, anchor=CENTER)
	p2=Frame(inside, relief="raised", width=6, height=10,
		          bg=Color.CHROME, bd=2)
	p2.place(relx=.75, rely=.7, anchor=CENTER)

class PowerSwitch(GUICommon):
    def __init__(self, master, label='I   0', base=Color.PANEL):
        self.base = base
        self.set_colors(master)
        self.switch_frame = Frame(master, relief="raised", width=45,
	                  height=28, bg=self.vlbase, bd=4)
	switch = Frame(self.switch_frame, relief="sunken", width=32,
                       height=22, bg=self.base, bd=2)
	switch.place(relx=0.5, rely=0.5, anchor=CENTER)
	lbl=Label(switch, text=label, font=("Verdana", 10, "bold"), 
		       fg='white', bd=0, bg=self.dbase)
	lbl.place(relx=0.5, rely=0.5, anchor=CENTER)

class BNC(GUICommon):
    def __init__(self, master, status=0, diameter=18, port=-1, fid=''): 
        self.base = master['background']
	self.hitID = fid
	self.status=status
        self.blink        = 0
        self.blinkrate    = 1
        self.on           = 0
        self.onState      = None
        self.Colors       = [None, Color.CHROME, Color.ON,
                             Color.WARN, Color.ALARM, '#00ffdd']

	basesize = diameter+6
        self.bnc_frame = Frame(master, relief="flat", bg=self.base,
                               bd=0, highlightthickness=0, takefocus=1)
	self.bnc_frame.pack(expand=0)
	self.bnc_frame.bind('<FocusIn>', self.focus_in)
	self.bnc_frame.bind('<FocusOut>', self.focus_out)

	self.canvas=Canvas(self.bnc_frame, width=basesize, height=basesize,
                           highlightthickness=0, bg=self.base, bd=0)
	center = basesize/2
	r = diameter/2

	self.pins=self.canvas.create_rectangle(0, center+2, basesize-1, 10,
                                               fill=Color.CHROME)
	self.bnc=self.canvas.create_oval(center-r, center-r,
                                         center+r, center+r, 
                                         fill=Color.CHROME, outline="black")
	r = r-3
	self.canvas.create_oval(center-r, center-r, center+r, center+r, 
                                fill=Color.INSIDE, outline='black')
	r = r-2
	self.canvas.create_oval(center-r, center-r, center+r, center+r, 
                                fill=Color.CHROME)
	r = r-3
	self.canvas.create_oval(center-r, center-r, center+r, center+r, 
                                fill=Color.INSIDE, outline='black')

	self.canvas.pack(side=TOP, fill=X, expand=0)

	if self.hitID:
	    self.hitID = '%s.%d' % (self.hitID, port)
	    for widget in [self.bnc_frame]:
	        widget.bind('<KeyPress-space>', self.panelMenu)
	        widget.bind('<Button-1>', self.panelMenu)
	    for widget in [self.canvas]:
	        widget.bind('<1>', self.panelMenu)

    def focus_in(self, event):