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annotate Widgets/FlyingFader.py @ 20:6eafd86930b5

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fix precision bug
author dmcc
date Sun, 07 Jul 2002 06:58:03 +0000
parents 053889940418
children 626aa2179630
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1 from Tkinter import *
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2 from time import time
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4 class FlyingFader(Frame):
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5 def __init__(self, master, variable, label, time=1.5, font=('Arial', 8),
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6 **kw):
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7 Frame.__init__(self, master)
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8 self.name = label
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9 self.variable = variable
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10 self.fadelength = time
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11 self.curfade = None
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12 self.fadetimes = 0, 0
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14 self.config({'bd':1, 'relief':'raised'})
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15 scaleopts = {'variable' : variable, 'showvalue' : 0, 'from' : 100,
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16 'to' : 0, 'res' : 0.1, 'width' : 20, 'length' : 200}
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17 scaleopts.update(kw)
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18
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19 self.scale = Scale(self, scaleopts)
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20 self.vlabel = Label(self, text="0.0", font=font)
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21 self.label = Label(self, text=label, wraplength=40, font=font)
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22
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23 self.oldtrough = self.scale['troughcolor']
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24
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25 self.scale.pack(side=TOP, expand=1, fill=BOTH, anchor='c')
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26 self.vlabel.pack(side=BOTTOM, expand=0, fill=X)
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27 self.label.pack(side=BOTTOM, expand=0, fill=X)
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28
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29 for k in range(1, 10):
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30 self.scale.bind("<Key-%d>" % k,
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31 lambda evt, k=k: self.newfade(k / 10.0, evt))
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32
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33 self.scale.bind("<Key-0>", lambda evt: self.newfade(100, evt))
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34 self.scale.bind("<grave>", lambda evt: self.newfade(0, evt))
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35
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36 self.scale.bind("<1>", self.cancelfade)
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37 self.scale.bind("<2>", self.cancelfade)
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38 self.scale.bind("<3>", self.mousefade)
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39
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40 self.variable.trace('w', self.updatelabel)
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41
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42 def cancelfade(self, evt):
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43 self.fadetimes = 0, 0
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44 self.curfade = 0, self.variable.get()
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45 self.scale['troughcolor'] = self.oldtrough
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46
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47 def mousefade(self, evt):
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48 target = float(self.tk.call(self.scale, 'get', evt.x, evt.y))
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49 self.newfade(target, evt)
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50
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51 def newfade(self, newlevel, evt=None, length=None):
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52 if length is None:
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53 length = self.fadelength
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54 mult = 1
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55
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56 if evt.state & 8 and evt.state & 4: mult = 0.25 # both
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57 elif evt.state & 8: mult = 0.5 # alt
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58 elif evt.state & 4: mult = 2 # control
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59
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60 now = time()
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61 self.fadetimes = (now, now + (mult * length))
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62 self.curfade = (self.variable.get(), newlevel)
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63
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64 self.scale['troughcolor'] = 'red'
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65
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66 self.gofade()
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67
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68 def gofade(self):
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69 now = time()
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70 start, end = self.fadetimes
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71 lstart, lend = self.curfade
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72 if now > end:
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73 self.fadetimes = 0, 0
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74 self.variable.set(lend)
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75 self.scale['troughcolor'] = self.oldtrough
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76 return
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77 percent = (now - start) / (end - start)
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78 newvalue = (percent * (lend - lstart)) + lstart
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79 self.variable.set(newvalue)
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80 colorfade(self.scale, percent)
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81 self.after(10, self.gofade)
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82
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83 def updatelabel(self, *args):
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84 self.vlabel['text'] = "%.3f" % self.variable.get()
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85 if self.fadetimes[1] == 0: # no fade
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86 self.vlabel['fg'] = 'black'
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87 elif self.curfade[1] > self.curfade[0]:
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88 self.vlabel['fg'] = 'red'
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89 else:
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90 self.vlabel['fg'] = 'blue'
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91
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92 def get(self):
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93 return self.scale.get()
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94
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95 def set(self, val):
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96 self.scale.set(val)
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97
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98
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99 def colorfade(scale, lev):
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100 low = (255, 255, 255)
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101 high = (0, 0, 0)
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102 out = [int(l+lev*(h-l)) for h, l in zip(high,low)]
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103 col="#%02X%02X%02X" % tuple(out)
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104 scale.config(troughcolor=col)
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105
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106 if __name__ == '__main__':
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107 root = Tk()
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108 root.tk_focusFollowsMouse()
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109
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110 FlyingFader(root, variable=DoubleVar(), label="suck").pack(side=LEFT,
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111 expand=1, fill=BOTH)
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112 FlyingFader(root, variable=DoubleVar(), label="moof").pack(side=LEFT,
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113 expand=1, fill=BOTH)
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114 FlyingFader(root, variable=DoubleVar(), label="zarf").pack(side=LEFT,
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115 expand=1, fill=BOTH)
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116 FlyingFader(root, variable=DoubleVar(),
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117 label="long name goes here. got it?").pack(side=LEFT, expand=1,
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118 fill=BOTH)
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119
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120 root.mainloop()