75 lines
1.7 KiB
Python
75 lines
1.7 KiB
Python
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# Module 'Sliders'
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#
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# Sliders are somewhat like buttons but have an extra hook that is
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# called whenever their value is changed.
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import stdwin
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from stdwinevents import *
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import rect
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from minmax import min, max
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from Buttons import ClassicButton
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# Field indices in event detail
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#
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_HV = 0
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_CLICKS = 1
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_BUTTON = 2
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_MASK = 3
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# A dragslider is the simplest possible slider.
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# It looks like a button but dragging the mouse left or right
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# changes the controlled value.
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#
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class DragSlider() = ClassicButton():
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#
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# INVARIANTS maintained by the define and setval methods:
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#
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# self.min <= self.val <= self.max
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# self.text = `self.val`
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#
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# (Notice that unlike in Python ranges, the end point belongs
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# to the range.)
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#
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def define(self, (win, bounds)):
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self.min = 0
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self.val = 50
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self.max = 100
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self.setval_hook = 0
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self.pretext = self.postext = ''
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self.text = self.pretext + `self.val` + self.postext
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self = ClassicButton.define(self, (win, bounds, self.text))
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return self
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#
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def setval(self, val):
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val = min(self.max, max(self.min, val))
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if val <> self.val:
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self.val = val
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self.text = self.pretext + `self.val` + self.postext
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if self.setval_hook:
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self.setval_hook(self)
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self.redraw()
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#
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def settext(self, text):
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pass # shouldn't be called at all
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#
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def mouse_down(self, detail):
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h, v = hv = detail[_HV]
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if self.enabled and self.mousetest(hv):
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self.anchor = h
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self.oldval = self.val
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self.active = 1
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#
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def mouse_move(self, detail):
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if self.active:
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h, v = detail[_HV]
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self.setval(self.oldval + (h - self.anchor))
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#
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def mouse_up(self, detail):
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if self.active:
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h, v = detail[_HV]
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self.setval(self.oldval + (h - self.anchor))
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self.active = 0
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#
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