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annotate engine/extensions/pychan/layout.py @ 253:6ab09eb765a1

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* Added patch by MadMonk that exposes the guichan focus functions to pychan * Thanks for contributing
author nihathrael@33b003aa-7bff-0310-803a-e67f0ece8222
date Fri, 08 May 2009 08:45:27 +0000
parents 54bfd1015b35
children
rev   line source
205
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1 # coding: utf-8
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2
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3 from attrs import IntAttr
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4
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5 AlignTop, AlignBottom, AlignLeft, AlignRight, AlignCenter = range(5)
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6 def isLayouted(widget):
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7 return isinstance(widget,LayoutBase)
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8
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9 class LayoutBase(object):
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10 """
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11 This class is at the core of the layout engine. The two MixIn classes L{VBoxLayoutMixin}
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12 and L{HBoxLayoutMixin} specialise on this by reimplementing the C{resizeToContent} and
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13 the C{expandContent} methods.
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14
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15 Dynamic Layouting
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16 -----------------
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17
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18 The layout is calculated in the L{Widget.show} method. Thus if you modify the layout,
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19 by adding or removing child widgets for example, you have to call L{widgets.Widget.adaptLayout}
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20 so that the changes ripple through the widget hierachy.
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21
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22 Internals
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23 ---------
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24
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25 At the core the layout engine works in two passes:
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26
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27 Before a root widget loaded by the XML code is shown, its resizeToContent method
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28 is called recursively (walking the widget containment relation in post order).
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29 This shrinks all HBoxes and VBoxes to their minimum heigt and width.
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30 After that the expandContent method is called recursively in the same order,
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31 which will re-align the widgets if there is space left AND if a Spacer is contained.
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32
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33 Inside bare Container instances (without a Layout MixIn) absolute positioning
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34 can be used.
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35 """
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36 def __init__(self,align = (AlignLeft,AlignTop), **kwargs):
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37 self.align = align
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38 self.spacer = []
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39 super(LayoutBase,self).__init__(**kwargs)
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40
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41 def addSpacer(self,spacer):
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42 self.spacer.append(spacer)
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43 spacer.index = len(self.children)
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44
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45 def xdelta(self,widget):return 0
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46 def ydelta(self,widget):return 0
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47
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48 def _applyHeight(self, spacers = []):
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49 y = self.border_size + self.margins[1]
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50 ydelta = map(self.ydelta,self.children)
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51 for index, child in enumerate(self.children):
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52 while spacers and spacers[0].index == index:
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53 y += spacers.pop(0).size
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54 child.y = y
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55 y += ydelta.pop(0)
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56
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57 def _adjustHeightWithSpacer(self):
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58 pass
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59
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60 def _applyWidth(self, spacers = []):
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61 x = self.border_size + self.margins[0]
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62 xdelta = map(self.xdelta,self.children)
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63 for index, child in enumerate(self.children):
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64 while spacers and spacers[0].index == index:
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65 x += spacers.pop(0).size
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66 child.x = x
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67 x += xdelta.pop(0)
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68
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69 def _expandWidthSpacer(self):
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70 xdelta = map(self.xdelta,self.children)
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71 xdelta += [spacer.min_size for spacer in self.spacer]
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72
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73 available_space = self.width - 2*self.margins[0] - 2*self.border_size - self._extra_border[0]
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74
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75 used_space = sum(xdelta)
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76 if self.children:
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77 used_space -= self.padding
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78 if used_space >= available_space:
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79 return
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80
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81 expandable_items = self._getExpanders(vertical=False)
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82 #print "AS/US - before",self,[o.width for o in expandable_items]
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83 #print "SPACERS",self.spacer
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84
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85 index = 0
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86 while used_space < available_space and expandable_items:
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87 index = index % len(expandable_items)
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88
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89 expander = expandable_items[index]
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90 old_width = expander.width
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91 expander.width += 1
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92 if old_width == expander.width:
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93 expandable_items.pop(index)
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94 else:
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95 used_space += 1
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96 index += 1
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97
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98 #print "AS/US - after",self,[o.width for o in expandable_items]
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99 #print "SPACERS",self.spacer
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100 self._applyWidth(spacers = self.spacer[:])
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101
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102 def _expandHeightSpacer(self):
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103 ydelta = map(self.ydelta,self.children)
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104 ydelta += [spacer.min_size for spacer in self.spacer]
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105
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106 available_space = self.height - 2*self.margins[1] - 2*self.border_size - self._extra_border[1]
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107
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108 used_space = sum(ydelta)
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109 if self.children:
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110 used_space -= self.padding
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111
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112 if used_space >= available_space:
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113 return
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114
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115 expandable_items = self._getExpanders(vertical=True)
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116 #print "AS/US - before",self,[o.height for o in expandable_items]
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117
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118 index = 0
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119 while used_space < available_space and expandable_items:
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120 index = index % len(expandable_items)
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121
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122 expander = expandable_items[index]
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123 old_width = expander.height
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124 expander.height += 1
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125 if old_width == expander.height:
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126 expandable_items.pop(index)
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127 else:
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128 used_space += 1
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129 index += 1
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130
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131 #print "AS/US - after",self,[o.height for o in expandable_items]
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132 self._applyHeight(spacers = self.spacer[:])
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133
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134
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135 def _getExpanders(self,vertical=True):
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136 expanders = []
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137 spacers = self.spacer[:]
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138 for index, child in enumerate(self.children):
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139 if spacers and spacers[0].index == index:
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140 expanders.append( spacers.pop(0) )
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141 #print self,child,child.expanding
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142 if child.vexpanding and vertical:
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143 expanders.append( child )
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144 if child.hexpanding and not vertical:
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145 expanders.append( child )
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146 return expanders + spacers
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147
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148 def _resetSpacers(self):
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149 for spacer in self.spacer:
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150 spacer.size = 0
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151
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152 class VBoxLayoutMixin(LayoutBase):
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153 """
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154 A mixin class for a vertical layout. Do not use directly.
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155 """
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156 def __init__(self,**kwargs):
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157 super(VBoxLayoutMixin,self).__init__(**kwargs)
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158
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159 def resizeToContent(self, recurse = True):
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160 self._resetSpacers()
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161
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162 max_w = self.getMaxChildrenWidth()
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163 x = self.margins[0] + self.border_size
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164 y = self.margins[1] + self.border_size
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165 for widget in self.children:
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166 widget.width = max_w
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167 y += widget.height + self.padding
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168
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169 if self.children:
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170 y -= self.padding
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171
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172 y += sum([spacer.min_size for spacer in self.spacer])
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173
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174 self.height = y + self.margins[1] + self.border_size + self._extra_border[1]
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175 self.width = max_w + 2*x + self._extra_border[0]
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176
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177 self._applyHeight(spacers = self.spacer[:])
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178 self._applyWidth()
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179
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180 def expandContent(self):
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181 self._expandHeightSpacer()
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182 if not self.hexpanding:return
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183 for widget in self.children:
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184 widget.width = self.width - 2*self.margins[0] - 2*self.border_size - self._extra_border[0]
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185
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186
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187 def ydelta(self,widget):return widget.height + self.padding
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188
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189 class HBoxLayoutMixin(LayoutBase):
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190 """
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191 A mixin class for a horizontal layout. Do not use directly.
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192 """
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193 def __init__(self,**kwargs):
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194 super(HBoxLayoutMixin,self).__init__(**kwargs)
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195
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196 def resizeToContent(self, recurse = True):
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197 self._resetSpacers()
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198
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199 max_h = self.getMaxChildrenHeight()
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200 x = self.margins[0] + self.border_size
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201 y = self.margins[1] + self.border_size
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202 for widget in self.children:
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203 widget.height = max_h
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204 x += widget.width + self.padding
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205 if self.children:
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206 x -= self.padding
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207 x += sum([spacer.min_size for spacer in self.spacer])
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208
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209 self.width = x + self.margins[0] + self._extra_border[0]
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210 self.height = max_h + 2*y + self._extra_border[1]
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211
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212 self._applyHeight()
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213 self._applyWidth(spacers = self.spacer[:])
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214
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215 def expandContent(self):
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216 self._expandWidthSpacer()
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217 if not self.vexpanding:return
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218 for widget in self.children:
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219 widget.height = self.height - 2*self.margins[1] - 2*self.border_size - self._extra_border[1]
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220
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221 def xdelta(self,widget):return widget.width + self.padding
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222
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223 class Spacer(object):
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224 """ A spacer represents expandable or fixed 'whitespace' in the GUI.
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225
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226 In a XML file you can get this by adding a <Spacer /> inside a VBox or
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227 HBox element (Windows implicitly are VBox elements).
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228
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229 Attributes
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230 ----------
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231
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232 As with widgets a number of attributes can be set on a spacer (inside the XML definition).
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233
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234 - min_size: Int: The minimal size this Spacer is allowed to have.
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235 - max_size: Int: The maximal size this Spacer is allowed to have.
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236 - fixed_size: Int: Set min_size and max_size to the same vale - effectively a Fixed size spacer.
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237
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238 """
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239
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240 ATTRIBUTES = [
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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241 IntAttr('min_size'), IntAttr('size'), IntAttr('max_size'),
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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242 IntAttr('fixed_size'),
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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243 ]
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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244
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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245 def __init__(self,parent=None,**kwargs):
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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246 self._parent = parent
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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247 self.min_size = 0
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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248 self.max_size = 1000
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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249 self.size = 0
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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250
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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251 def __str__(self):
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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252 return "Spacer(parent.name='%s')" % getattr(self._parent,'name','None')
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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253
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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254 def __repr__(self):
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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255 return "<Spacer(parent.name='%s') at %x>" % (getattr(self._parent,'name','None'),id(self))
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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256
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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257 def _getSize(self):
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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258 self.size = self._size
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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259 return self._size
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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260 def _setSize(self,size):
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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261 self._size = max(self.min_size, min(self.max_size,size))
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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262 size = property(_getSize,_setSize)
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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263
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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264 # Alias for size
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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265 width = property(_getSize,_setSize)
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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266 height = property(_getSize,_setSize)
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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267
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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268 def _setFixedSize(self,size):
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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269 self.min_size = self.max_size = size
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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270 self.size = size
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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271 fixed_size = property(fset=_setFixedSize)
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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272
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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273 def _isExpanding(self):
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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274 if self.min_size < self.max_size:
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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275 return 1
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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276 return 0
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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277 vexpanding = property(_isExpanding)
54bfd1015b35 * PyChan event handling rework (part I)
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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278 hexpanding = property(_isExpanding)