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annotate Widgets/FlyingFader.py @ 9:342f7d1c7561
The FlyingFader will accept keyboard values and fade to them over 1.5
The FlyingFader will accept keyboard values and fade to them over 1.5
seconds. Combinations of control and alt change that speed. RMB
also creates a fade and LMB will cancel them. Colors are pretty
and informative. Fades can be created manually with the newfade()
function.
| author | dmcc |
|---|---|
| date | Sun, 07 Jul 2002 05:13:12 +0000 |
| parents | 45b12307c695 |
| children | c65119b66b00 |
| rev | line source |
|---|---|
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The FlyingFader will accept keyboard values and fade to them over 1.5
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1 from Tkinter import * |
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2 from time import time |
| 0 | 3 |
| 4 class FlyingFader(Frame): | |
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5 def __init__(self, master, variable, label, time=1.5, font=('Arial', 8), |
| 0 | 6 **kw): |
| 7 Frame.__init__(self, master) | |
| 8 self.name = label | |
| 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 |
| 0 | 13 |
| 14 self.config({'bd':1, 'relief':'raised'}) | |
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15 self.scale = Scale(self, 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 self.vlabel = Label(self, text="0.0", font=font) |
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18 self.label = Label(self, text=label, wraplength=40, font=font) |
| 0 | 19 |
| 20 self.oldtrough = self.scale['troughcolor'] | |
| 21 | |
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22 self.scale.pack(side=TOP, expand=1, fill=BOTH, anchor='c') |
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23 self.vlabel.pack(side=BOTTOM, expand=0, fill=X) |
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24 self.label.pack(side=BOTTOM, expand=0, fill=X) |
| 0 | 25 |
| 26 for k in range(1, 10): | |
| 27 self.scale.bind("<Key-%d>" % k, | |
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28 lambda evt, k=k: self.newfade(k * 10, evt)) |
| 0 | 29 |
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30 self.scale.bind("<Key-0>", lambda evt: self.newfade(100, evt)) |
| 0 | 31 self.scale.bind("<grave>", lambda evt: self.newfade(0, evt)) |
| 32 | |
| 33 self.scale.bind("<1>", self.cancelfade) | |
| 34 self.scale.bind("<3>", self.mousefade) | |
| 35 | |
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36 self.variable.trace('w', self.updatelabel) |
| 0 | 37 |
| 38 def cancelfade(self, evt): | |
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39 self.fadetimes = 0, 0 |
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40 self.curfade = 0, self.variable.get() |
| 0 | 41 self.scale['troughcolor'] = self.oldtrough |
| 42 | |
| 43 def mousefade(self, evt): | |
| 44 target = float(self.tk.call(self.scale, 'get', evt.x, evt.y)) | |
| 45 self.newfade(target, evt) | |
| 46 | |
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47 def newfade(self, newlevel, evt=None, length=None): |
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48 if length is None: |
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49 length = self.fadelength |
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50 mult = 1 |
| 0 | 51 |
| 52 if evt.state & 8 and evt.state & 4: mult = 0.25 # both | |
| 53 elif evt.state & 8: mult = 0.5 # alt | |
| 54 elif evt.state & 4: mult = 2 # control | |
| 55 | |
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56 now = time() |
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57 self.fadetimes = (now, now + (mult * length)) |
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58 self.curfade = (self.variable.get(), newlevel) |
| 0 | 59 |
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60 self.scale['troughcolor'] = 'red' |
| 0 | 61 |
| 62 self.gofade() | |
| 63 | |
| 64 def gofade(self): | |
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65 now = time() |
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66 start, end = self.fadetimes |
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67 lstart, lend = self.curfade |
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68 if now > end: |
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69 self.fadetimes = 0, 0 |
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70 self.variable.set(lend) |
| 0 | 71 self.scale['troughcolor'] = self.oldtrough |
| 72 return | |
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73 percent = (now - start) / (end - start) |
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74 newvalue = (percent * (lend - lstart)) + lstart |
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75 self.variable.set(newvalue) |
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76 colortrough(self.scale, percent) |
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77 self.after(10, self.gofade) |
| 0 | 78 |
| 79 def updatelabel(self, *args): | |
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80 self.vlabel['text'] = "%.1f" % self.variable.get() |
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81 if self.fadetimes[1] == 0: # no fade |
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82 self.vlabel['fg'] = 'black' |
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83 elif self.curfade[1] > self.curfade[0]: |
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84 self.vlabel['fg'] = 'red' |
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85 else: |
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86 self.vlabel['fg'] = 'blue' |
| 0 | 87 |
| 88 | |
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89 def colortrough(scale, lev): |
| 0 | 90 low = (255, 255, 255) |
| 91 high = (0, 0, 0) | |
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92 out = [int(l+lev*(h-l)) for h,l in zip(high,low)] |
| 0 | 93 col="#%02X%02X%02X" % tuple(out) |
| 94 scale.config(troughcolor=col) | |
| 95 | |
| 96 if __name__ == '__main__': | |
| 97 root = Tk() | |
| 98 root.tk_focusFollowsMouse() | |
| 99 | |
| 100 FlyingFader(root, variable=DoubleVar(), label="suck").pack(side=LEFT, | |
| 101 expand=1, fill=BOTH) | |
| 102 FlyingFader(root, variable=DoubleVar(), label="moof").pack(side=LEFT, | |
| 103 expand=1, fill=BOTH) | |
| 104 FlyingFader(root, variable=DoubleVar(), label="zarf").pack(side=LEFT, | |
| 105 expand=1, fill=BOTH) | |
| 106 FlyingFader(root, variable=DoubleVar(), | |
| 107 label="long name goes here. got it?").pack(side=LEFT, expand=1, | |
| 108 fill=BOTH) | |
| 109 | |
| 110 root.mainloop() |