# Module 'Sliders'
import stdwin
from stdwinevents import *
import rect
from Buttons import *
from HVSplit import HSplit
# Field indices in event detail
#
_HV = 0
_CLICKS = 1
_BUTTON = 2
_MASK = 3
# DragSlider is the simplest possible slider.
# It looks like a button but dragging the mouse left or right
# changes the controlled value.
# It does not support any of the triggers or hooks defined by Buttons,
# but defines its own setval_trigger and setval_hook.
#
class DragSliderReactivity(BaseReactivity):
#
def mouse_down(self, detail):
h, v = hv = detail[_HV]
if self.enabled and self.mousetest(hv):
self.anchor = h
self.oldval = self.val
self.active = 1
#
def mouse_move(self, detail):
if self.active:
h, v = detail[_HV]
self.setval(self.oldval + (h - self.anchor))
#
def mouse_up(self, detail):
if self.active:
h, v = detail[_HV]
self.setval(self.oldval + (h - self.anchor))
self.active = 0
#
class DragSliderAppearance(ButtonAppearance):
#
# INVARIANTS maintained by the setval method:
#
# self.min <= self.val <= self.max
# self.text = self.pretext + `self.val` + self.postext
#
# (Notice that unlike Python ranges, the end point belongs
# to the range.)
#
def init_appearance(self):
ButtonAppearance.init_appearance(self)
self.min = 0
self.val = 0
self.max = 100
self.hook = 0
self.pretext = self.postext = ''
self.recalctext()
#
# The 'get*' and 'set*' methods belong to the generic slider interface
#
def getval(self): return self.val
#
def sethook(self, hook):
self.hook = hook
#
def setminvalmax(self, min, val, max):
self.min = min
self.max = max
self.setval(val)
#
def settexts(self, pretext, postext):
self.pretext = pretext
self.postext = postext
self.recalctext()
#
def setval(self, val):
val = min(self.max, max(self.min, val))
if val <> self.val:
self.val = val
self.recalctext()
self.trigger()
#
def trigger(self):
if self.hook:
self.hook(self)
#
def recalctext(self):
self.settext(self.pretext + `self.val` + self.postext)
#
class DragSlider(DragSliderReactivity, DragSliderAppearance, Define):
def definetext(self, parent, text):
raise RuntimeError, 'DragSlider.definetext() not supported'
# Auxiliary class for PushButton incorporated in ComplexSlider
#
class _StepButton(PushButton):
def define(self, parent):
self = PushButton.define(self, parent)
self.step = 0
return self
def setstep(self, step):
self.step = step
def definetextstep(self, parent, text, step):
self = self.definetext(parent, text)
self.setstep(step)
return self
def init_reactivity(self):
PushButton.init_reactivity(self)
self.parent.need_timer(self)
def step_trigger(self):
self.parent.setval(self.parent.getval() + self.step)
def down_trigger(self):
self.step_trigger()
self.parent.settimer(5)
def timer(self):
if self.hilited:
self.step_trigger()
if self.active:
self.parent.settimer(1)
# A complex slider is an HSplit initialized to three buttons:
# one to step down, a dragslider, and one to step up.
#
class ComplexSlider(HSplit):
#
# Override Slider define() method
#
def define(self, parent):
self = self.create(parent) # HSplit
#
self.downbutton = _StepButton().definetextstep(self, '-', -1)
self.dragbutton = DragSlider().define(self)
self.upbutton = _StepButton().definetextstep(self, '+', 1)
#
return self
#
# Override HSplit methods
#
def getminsize(self, m, (width, height)):
w1, h1 = self.downbutton.getminsize(m, (0, height))
w3, h3 = self.upbutton.getminsize(m, (0, height))
w1 = max(w1, h1)
w3 = max(w3, h3)
w2, h2 = self.dragbutton.getminsize(m, (width-w1-w3, height))
return w1+w2+w3, max(h1, h2, h3)
#
def setbounds(self, bounds):
(left, top), (right, bottom) = self.bounds = bounds
size = bottom - top
self.downbutton.setbounds(((left, top), (left+size, bottom)))
self.dragbutton.setbounds(((left+size, top), \
(right-size, bottom)))
self.upbutton.setbounds(((right-size, top), (right, bottom)))
#
# Pass other Slider methods on to dragbutton
#
def getval(self): return self.dragbutton.getval()
def sethook(self, hook): self.dragbutton.sethook(hook)
def setminvalmax(self, args): self.dragbutton.setminvalmax(args)
def settexts(self, args): self.dragbutton.settexts(args)
def setval(self, val): self.dragbutton.setval(val)
def enable(self, flag):
self.downbutton.enable(flag)
self.dragbutton.enable(flag)
self.upbutton.enable(flag)
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