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1 from Tix import *
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2 from __future__ import division
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3
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4 class Xfader(Canvas):
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5 def __init__(self, scalelevelsIn):
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6 global scalelevels
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7 scalelevels=scalelevelsIn
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8 self.checkbuttons={}
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9 self.startcoord=None
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10 def sub2(self,a,b):
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11 return ( (a[0]-b[0]), (a[1]-b[1]))
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12 def down(self,ev):
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13 global scalelevels
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14 self.startcoord=(ev.x,-ev.y)
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15 self.startlevels = dict([(k,v.get()) for k,v in scalelevels.items()])
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16 # find the channel names of the selected subs
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17 self.onchannel = {
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18 'x':[x for x in scalelevels.keys() if self.checkbuttons[x]['x'].get()],
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19 'y':[x for x in scalelevels.keys() if self.checkbuttons[x]['y'].get()]
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20 }
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21
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22
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23 #self.create_line(0,0,100,100,tag='transient')
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24
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25 def getoriglevel(self,subname):
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26 return self.startlevels[subname]
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27 def up(self,ev):
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28 self.startcoord=None
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29 self.delete('transient')
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30 # self.clearallbuttons()
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31 def moved(self,ev):
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32 if self.startcoord is None:
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33 return
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34 pos=(ev.x,-ev.y)
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35 deltas= self.sub2(pos,self.startcoord)
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36 for axis,delta in zip(('x','y'),deltas):
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37 onchan=self.onchannel[axis]
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38 for subn in onchan:
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39 newlev = self.getoriglevel(subn) + 1.0*delta/75
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40 newlev = int(newlev*1000)/1000.0
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41 newlev = min(1.0,max(newlev,0.0))
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42 scalelevels[subn].set( newlev )
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43 def width(self):
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44 return int(self['width'])
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45 def height(self):
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46 return int(self['height'])
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47 def setupwidget(self,parent):
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48 Canvas.__init__(self,parent,width=150,height=150,bg="grey40")
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49 self.pack(side='bottom')
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50 self.create_rectangle(5,5,self.width()-5,self.height()-5)
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51 self.create_line(0,self.height()/2,150,self.height()/2)
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52 self.create_line(self.width()/2,0,self.width()/2,self.height())
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53 self.bind("<ButtonPress-1>",self.down)
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54 self.bind("<ButtonRelease-1>",self.up)
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55 self.bind("<B1-Motion>",self.moved)
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56
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57 def registerbutton(self,subname,axis,checkvar):
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58 if subname not in self.checkbuttons:
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59 self.checkbuttons[subname]={}
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60 self.checkbuttons[subname][axis]=checkvar
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61 def clearallbuttons(self, axis='both'):
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62 for cb in self.checkbuttons.values():
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63 if axis == 'both':
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64 for a in cb.values():
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65 a.set(0)
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66 else:
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67 cb[axis].set(0)
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68 def grab(self,axis):
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69 self.clearallbuttons(axis)
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70 for n,sv in scalelevels.items():
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71 if sv.get() and n != 'blacklight':
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72 self.checkbuttons[n][axis].set(1)
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73
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74
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