Mercurial > cpython-lru_cache-weakref

annotate Lib/lib-stdwin/Sliders.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 1d06b1499eb9
children
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1 # Module 'Sliders'
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2
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3
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4 import stdwin
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5 from stdwinevents import *
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6 import rect
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7 from Buttons import *
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8 from HVSplit import HSplit
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9
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10
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11 # Field indices in event detail
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12 #
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13 _HV = 0
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14 _CLICKS = 1
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15 _BUTTON = 2
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16 _MASK = 3
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17
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18
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19 # DragSlider is the simplest possible slider.
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20 # It looks like a button but dragging the mouse left or right
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21 # changes the controlled value.
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22 # It does not support any of the triggers or hooks defined by Buttons,
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23 # but defines its own setval_trigger and setval_hook.
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24 #
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25 class DragSliderReactivity(BaseReactivity):
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26 #
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27 def mouse_down(self, detail):
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28 h, v = hv = detail[_HV]
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29 if self.enabled and self.mousetest(hv):
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30 self.anchor = h
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31 self.oldval = self.val
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32 self.active = 1
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33 #
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34 def mouse_move(self, detail):
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35 if self.active:
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36 h, v = detail[_HV]
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37 self.setval(self.oldval + (h - self.anchor))
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38 #
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39 def mouse_up(self, detail):
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40 if self.active:
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41 h, v = detail[_HV]
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42 self.setval(self.oldval + (h - self.anchor))
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43 self.active = 0
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44 #
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45
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46 class DragSliderAppearance(ButtonAppearance):
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47 #
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48 # INVARIANTS maintained by the setval method:
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49 #
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50 # self.min <= self.val <= self.max
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51 # self.text = self.pretext + `self.val` + self.postext
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52 #
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53 # (Notice that unlike Python ranges, the end point belongs
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54 # to the range.)
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55 #
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56 def init_appearance(self):
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57 ButtonAppearance.init_appearance(self)
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58 self.min = 0
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59 self.val = 0
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60 self.max = 100
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61 self.hook = 0
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62 self.pretext = self.postext = ''
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63 self.recalctext()
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64 #
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65 # The 'get*' and 'set*' methods belong to the generic slider interface
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66 #
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67 def getval(self): return self.val
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68 #
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69 def sethook(self, hook):
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70 self.hook = hook
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71 #
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72 def setminvalmax(self, min, val, max):
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73 self.min = min
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74 self.max = max
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75 self.setval(val)
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76 #
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77 def settexts(self, pretext, postext):
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78 self.pretext = pretext
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79 self.postext = postext
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80 self.recalctext()
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81 #
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82 def setval(self, val):
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83 val = min(self.max, max(self.min, val))
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84 if val <> self.val:
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85 self.val = val
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86 self.recalctext()
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87 self.trigger()
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88 #
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89 def trigger(self):
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90 if self.hook:
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91 self.hook(self)
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92 #
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93 def recalctext(self):
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94 self.settext(self.pretext + `self.val` + self.postext)
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95 #
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96
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97 class DragSlider(DragSliderReactivity, DragSliderAppearance, Define):
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98 def definetext(self, parent, text):
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99 raise RuntimeError, 'DragSlider.definetext() not supported'
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100
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101
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102 # Auxiliary class for PushButton incorporated in ComplexSlider
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103 #
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104 class _StepButton(PushButton):
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105 def define(self, parent):
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106 self = PushButton.define(self, parent)
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107 self.step = 0
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108 return self
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109 def setstep(self, step):
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110 self.step = step
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111 def definetextstep(self, parent, text, step):
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112 self = self.definetext(parent, text)
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113 self.setstep(step)
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114 return self
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115 def init_reactivity(self):
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116 PushButton.init_reactivity(self)
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117 self.parent.need_timer(self)
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118 def step_trigger(self):
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119 self.parent.setval(self.parent.getval() + self.step)
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120 def down_trigger(self):
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121 self.step_trigger()
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122 self.parent.settimer(5)
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123 def timer(self):
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124 if self.hilited:
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125 self.step_trigger()
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126 if self.active:
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127 self.parent.settimer(1)
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128
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129
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130 # A complex slider is an HSplit initialized to three buttons:
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131 # one to step down, a dragslider, and one to step up.
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132 #
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133 class ComplexSlider(HSplit):
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134 #
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135 # Override Slider define() method
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136 #
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137 def define(self, parent):
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138 self = self.create(parent) # HSplit
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139 #
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140 self.downbutton = _StepButton().definetextstep(self, '-', -1)
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141 self.dragbutton = DragSlider().define(self)
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142 self.upbutton = _StepButton().definetextstep(self, '+', 1)
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143 #
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144 return self
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145 #
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146 # Override HSplit methods
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147 #
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148 def getminsize(self, m, (width, height)):
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149 w1, h1 = self.downbutton.getminsize(m, (0, height))
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150 w3, h3 = self.upbutton.getminsize(m, (0, height))
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151 w1 = max(w1, h1)
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152 w3 = max(w3, h3)
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153 w2, h2 = self.dragbutton.getminsize(m, (width-w1-w3, height))
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154 return w1+w2+w3, max(h1, h2, h3)
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155 #
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156 def setbounds(self, bounds):
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157 (left, top), (right, bottom) = self.bounds = bounds
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158 size = bottom - top
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159 self.downbutton.setbounds(((left, top), (left+size, bottom)))
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160 self.dragbutton.setbounds(((left+size, top), \
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161 (right-size, bottom)))
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162 self.upbutton.setbounds(((right-size, top), (right, bottom)))
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163 #
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164 # Pass other Slider methods on to dragbutton
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165 #
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166 def getval(self): return self.dragbutton.getval()
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167 def sethook(self, hook): self.dragbutton.sethook(hook)
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168 def setminvalmax(self, args): self.dragbutton.setminvalmax(args)
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169 def settexts(self, args): self.dragbutton.settexts(args)
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170 def setval(self, val): self.dragbutton.setval(val)
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171 def enable(self, flag):
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172 self.downbutton.enable(flag)
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173 self.dragbutton.enable(flag)
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174 self.upbutton.enable(flag)