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annotate engine/extensions/pychan/widgets/layout.py @ 249:1cc51d145af9

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Further split up the containers.py; bugfix.
author phoku@33b003aa-7bff-0310-803a-e67f0ece8222
date Thu, 26 Mar 2009 16:36:21 +0000
parents
children 51cc05d862f2
rev   line source
249
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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1 # -*- coding: utf-8 -*-
1cc51d145af9 Further split up the containers.py; bugfix.
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2
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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3 from common import *
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4
1cc51d145af9 Further split up the containers.py; bugfix.
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5 class LayoutBase(object):
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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6 """
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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7 This class is at the core of the layout engine. The two MixIn classes L{VBoxLayoutMixin}
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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8 and L{HBoxLayoutMixin} specialise on this by reimplementing the C{resizeToContent} and
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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9 the C{expandContent} methods.
1cc51d145af9 Further split up the containers.py; bugfix.
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10
1cc51d145af9 Further split up the containers.py; bugfix.
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11 Dynamic Layouting
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12 -----------------
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13
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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14 The layout is calculated in the L{Widget.show} method. Thus if you modify the layout,
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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15 by adding or removing child widgets for example, you have to call L{Widget.adaptLayout}
1cc51d145af9 Further split up the containers.py; bugfix.
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16 so that the changes ripple through the widget hierachy.
1cc51d145af9 Further split up the containers.py; bugfix.
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17
1cc51d145af9 Further split up the containers.py; bugfix.
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18 Internals
1cc51d145af9 Further split up the containers.py; bugfix.
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19 ---------
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20
1cc51d145af9 Further split up the containers.py; bugfix.
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21 At the core the layout engine works in two passes:
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22
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23 Before a root widget loaded by the XML code is shown, its resizeToContent method
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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24 is called recursively (walking the widget containment relation in post order).
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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25 This shrinks all HBoxes and VBoxes to their minimum heigt and width.
1cc51d145af9 Further split up the containers.py; bugfix.
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26 After that the expandContent method is called recursively in the same order,
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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27 which will re-align the widgets if there is space left AND if a Spacer is contained.
1cc51d145af9 Further split up the containers.py; bugfix.
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28
1cc51d145af9 Further split up the containers.py; bugfix.
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29 Inside bare Container instances (without a Layout MixIn) absolute positioning
1cc51d145af9 Further split up the containers.py; bugfix.
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30 can be used.
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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31 """
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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32 def __init__(self,align = (AlignLeft,AlignTop), **kwargs):
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33 self.align = align
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34 self.spacer = None
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35 super(LayoutBase,self).__init__(**kwargs)
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36
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37 def addSpacer(self,spacer):
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38 if self.spacer:
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39 raise RuntimeException("Already a Spacer in %s!" % str(self))
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40 self.spacer = spacer
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41 spacer.index = len(self.children)
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42
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43 def xdelta(self,widget):return 0
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44 def ydelta(self,widget):return 0
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45
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46 def _adjustHeight(self):
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47 if self.align[1] == AlignTop:return #dy = 0
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48 if self.align[1] == AlignBottom:
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49 y = self.height - self.childarea[1] - self.border_size - self.margins[1]
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50 else:
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51 y = (self.height - self.childarea[1] - self.border_size - self.margins[1])/2
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52 for widget in self.children:
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53 widget.y = y
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54 y += self.ydelta(widget)
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55
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56 def _adjustHeightWithSpacer(self):
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57 pass
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58
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59 def _adjustWidth(self):
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60 if self.align[0] == AlignLeft:return #dx = 0
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61 if self.align[0] == AlignRight:
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62 x = self.width - self.childarea[0] - self.border_size - self.margins[0]
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63 else:
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64 x = (self.width - self.childarea[0] - self.border_size - self.margins[0])/2
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65 for widget in self.children:
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66 widget.x = x
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67 x += self.xdelta(widget)
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68
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69 def _expandWidthSpacer(self):
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70 x = self.border_size + self.margins[0]
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71 xdelta = map(self.xdelta,self.children)
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72
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73 for widget in self.children[:self.spacer.index]:
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74 widget.x = x
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75 x += xdelta.pop(0)
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76
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77 x = self.width - sum(xdelta) - self.border_size - self.margins[0]
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78 for widget in self.children[self.spacer.index:]:
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79 widget.x = x
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80 x += xdelta.pop(0)
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81
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82 def _expandHeightSpacer(self):
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83 y = self.border_size + self.margins[1]
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84 ydelta = map(self.ydelta,self.children)
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85
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86 for widget in self.children[:self.spacer.index]:
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87 widget.y = y
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88 y += ydelta.pop(0)
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89
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90 y = self.height - sum(ydelta) - self.border_size - self.margins[1]
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91 for widget in self.children[self.spacer.index:]:
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92 widget.y = y
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93 y += ydelta.pop(0)
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94
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95
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96 class VBoxLayoutMixin(LayoutBase):
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97 """
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98 A mixin class for a vertical layout. Do not use directly.
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99 """
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100 def __init__(self,**kwargs):
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101 super(VBoxLayoutMixin,self).__init__(**kwargs)
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102
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103 def resizeToContent(self, recurse = True):
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104 max_w = self.getMaxChildrenWidth()
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105 x = self.margins[0] + self.border_size
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106 y = self.margins[1] + self.border_size
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107 for widget in self.children:
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108 widget.x = x
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109 widget.y = y
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110 widget.width = max_w
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111 y += widget.height + self.padding
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112
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113 #Add the padding for the spacer.
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114 if self.spacer:
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115 y += self.padding
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116
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117 self.height = y + self.margins[1] - self.padding
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118 self.width = max_w + 2*x
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119 self.childarea = max_w, y - self.padding - self.margins[1]
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120
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121 self._adjustHeight()
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122 self._adjustWidth()
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123
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124 def expandContent(self):
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125 if self.spacer:
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126 self._expandHeightSpacer()
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127
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128 def ydelta(self,widget):return widget.height + self.padding
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129
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130 class HBoxLayoutMixin(LayoutBase):
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131 """
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132 A mixin class for a horizontal layout. Do not use directly.
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133 """
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134 def __init__(self,**kwargs):
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135 super(HBoxLayoutMixin,self).__init__(**kwargs)
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136
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137 def resizeToContent(self, recurse = True):
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138 max_h = self.getMaxChildrenHeight()
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139 x = self.margins[0] + self.border_size
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140 y = self.margins[1] + self.border_size
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141 for widget in self.children:
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142 widget.x = x
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143 widget.y = y
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144 widget.height = max_h
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145 x += widget.width + self.padding
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146
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147 #Add the padding for the spacer.
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148 if self.spacer:
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149 x += self.padding
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150
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151 self.width = x + self.margins[0] - self.padding
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152 self.height = max_h + 2*y
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153 self.childarea = x - self.margins[0] - self.padding, max_h
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154
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155 self._adjustHeight()
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156 self._adjustWidth()
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157
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158 def expandContent(self):
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159 if self.spacer:
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160 self._expandWidthSpacer()
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161
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162 def xdelta(self,widget):return widget.width + self.padding