Mercurial > fife-parpg

annotate engine/extensions/pychan/widgets/layout.py @ 302:94470d79576f

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* Small fix to make scons work in a fakeroot environment on ArchLinux. If this causes breakage please contact me.
author nihathrael@33b003aa-7bff-0310-803a-e67f0ece8222
date Fri, 10 Jul 2009 11:08:32 +0000
parents 51cc05d862f2
children d8bcff5f7222
rev   line source
249
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
1 # -*- coding: utf-8 -*-
1cc51d145af9 Further split up the containers.py; bugfix.
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2
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diff changeset
3 from pychan.attrs import IntAttr
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diff changeset
4
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
5 AlignTop, AlignBottom, AlignLeft, AlignRight, AlignCenter = range(5)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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6 def isLayouted(widget):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
7 return isinstance(widget,LayoutBase)
249
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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8
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
9 class LayoutBase(object):
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
10 """
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
11 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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12 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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diff changeset
13 the C{expandContent} methods.
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
14
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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15 Dynamic Layouting
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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16 -----------------
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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17
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
18 The layout is calculated in the L{Widget.show} method. Thus if you modify the layout,
255
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diff changeset
19 by adding or removing child widgets for example, you have to call L{widgets.Widget.adaptLayout}
249
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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20 so that the changes ripple through the widget hierachy.
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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21
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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22 Internals
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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23 ---------
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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24
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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25 At the core the layout engine works in two passes:
1cc51d145af9 Further split up the containers.py; bugfix.
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26
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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27 Before a root widget loaded by the XML code is shown, its resizeToContent method
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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28 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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29 This shrinks all HBoxes and VBoxes to their minimum heigt and width.
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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30 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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31 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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32
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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33 Inside bare Container instances (without a Layout MixIn) absolute positioning
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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34 can be used.
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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35 """
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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36 def __init__(self,align = (AlignLeft,AlignTop), **kwargs):
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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37 self.align = align
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38 self.spacer = []
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1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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39 super(LayoutBase,self).__init__(**kwargs)
1cc51d145af9 Further split up the containers.py; bugfix.
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40
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
41 def addSpacer(self,spacer):
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42 self.spacer.append(spacer)
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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43 spacer.index = len(self.children)
1cc51d145af9 Further split up the containers.py; bugfix.
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44
1cc51d145af9 Further split up the containers.py; bugfix.
phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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45 def xdelta(self,widget):return 0
1cc51d145af9 Further split up the containers.py; bugfix.
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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
255
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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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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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71 xdelta += [spacer.min_size for spacer in self.spacer]
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72
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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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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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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74
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75 used_space = sum(xdelta)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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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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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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79 return
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80
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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81 expandable_items = self._getExpanders(vertical=False)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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82 #print "AS/US - before",self,[o.width for o in expandable_items]
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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83 #print "SPACERS",self.spacer
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84
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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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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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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89 expander = expandable_items[index]
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90 old_width = expander.width
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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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[:])
249
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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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parents: 249
diff changeset
105
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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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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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
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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parents: 249
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111
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 249
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112 if used_space >= available_space:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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113 return
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diff changeset
114
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
115 expandable_items = self._getExpanders(vertical=True)
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diff changeset
116 #print "AS/US - before",self,[o.height for o in expandable_items]
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diff changeset
117
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diff changeset
118 index = 0
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diff changeset
119 while used_space < available_space and expandable_items:
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diff changeset
120 index = index % len(expandable_items)
249
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diff changeset
121
255
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diff changeset
122 expander = expandable_items[index]
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diff changeset
123 old_width = expander.height
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diff changeset
124 expander.height += 1
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diff changeset
125 if old_width == expander.height:
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diff changeset
126 expandable_items.pop(index)
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diff changeset
127 else:
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diff changeset
128 used_space += 1
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diff changeset
129 index += 1
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diff changeset
130
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diff changeset
131 #print "AS/US - after",self,[o.height for o in expandable_items]
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diff changeset
132 self._applyHeight(spacers = self.spacer[:])
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diff changeset
133
249
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diff changeset
134
255
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diff changeset
135 def _getExpanders(self,vertical=True):
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diff changeset
136 expanders = []
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diff changeset
137 spacers = self.spacer[:]
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diff changeset
138 for index, child in enumerate(self.children):
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diff changeset
139 if spacers and spacers[0].index == index:
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diff changeset
140 expanders.append( spacers.pop(0) )
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diff changeset
141 if child.vexpand and vertical:
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diff changeset
142 expanders += [child]*child.vexpand
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diff changeset
143 if child.hexpand and not vertical:
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diff changeset
144 expanders += [child]*child.hexpand
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diff changeset
145 return expanders + spacers
249
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diff changeset
146
255
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diff changeset
147 def _resetSpacers(self):
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diff changeset
148 for spacer in self.spacer:
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diff changeset
149 spacer.size = 0
249
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150
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diff changeset
151 class VBoxLayoutMixin(LayoutBase):
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152 """
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diff changeset
153 A mixin class for a vertical layout. Do not use directly.
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154 """
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diff changeset
155 def __init__(self,**kwargs):
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diff changeset
156 super(VBoxLayoutMixin,self).__init__(**kwargs)
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157
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diff changeset
158 def resizeToContent(self, recurse = True):
255
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diff changeset
159 self._resetSpacers()
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diff changeset
160
249
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diff changeset
161 max_w = self.getMaxChildrenWidth()
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diff changeset
162 x = self.margins[0] + self.border_size
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diff changeset
163 y = self.margins[1] + self.border_size
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164 for widget in self.children:
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diff changeset
165 widget.width = max_w
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diff changeset
166 y += widget.height + self.padding
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diff changeset
167
255
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diff changeset
168 if self.children:
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diff changeset
169 y -= self.padding
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diff changeset
170
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diff changeset
171 y += sum([spacer.min_size for spacer in self.spacer])
249
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diff changeset
172
255
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diff changeset
173 self.height = y + self.margins[1] + self.border_size + self._extra_border[1]
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diff changeset
174 self.width = max_w + 2*x + self._extra_border[0]
249
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diff changeset
175
255
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diff changeset
176 self._applyHeight(spacers = self.spacer[:])
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diff changeset
177 self._applyWidth()
249
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178
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diff changeset
179 def expandContent(self):
255
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diff changeset
180 self._expandHeightSpacer()
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diff changeset
181 if not self.hexpand and self.parent:return
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diff changeset
182 for widget in self.children:
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diff changeset
183 widget.width = self.width - 2*self.margins[0] - 2*self.border_size - self._extra_border[0]
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diff changeset
184
249
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diff changeset
185
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diff changeset
186 def ydelta(self,widget):return widget.height + self.padding
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187
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diff changeset
188 class HBoxLayoutMixin(LayoutBase):
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diff changeset
189 """
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diff changeset
190 A mixin class for a horizontal layout. Do not use directly.
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
191 """
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diff changeset
192 def __init__(self,**kwargs):
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diff changeset
193 super(HBoxLayoutMixin,self).__init__(**kwargs)
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diff changeset
194
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diff changeset
195 def resizeToContent(self, recurse = True):
255
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diff changeset
196 self._resetSpacers()
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diff changeset
197
249
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diff changeset
198 max_h = self.getMaxChildrenHeight()
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diff changeset
199 x = self.margins[0] + self.border_size
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diff changeset
200 y = self.margins[1] + self.border_size
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diff changeset
201 for widget in self.children:
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parents:
diff changeset
202 widget.height = max_h
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diff changeset
203 x += widget.width + self.padding
255
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diff changeset
204 if self.children:
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diff changeset
205 x -= self.padding
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 249
diff changeset
206 x += sum([spacer.min_size for spacer in self.spacer])
249
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diff changeset
207
255
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diff changeset
208 self.width = x + self.margins[0] + self._extra_border[0]
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
209 self.height = max_h + 2*y + self._extra_border[1]
249
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diff changeset
210
255
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diff changeset
211 self._applyHeight()
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 249
diff changeset
212 self._applyWidth(spacers = self.spacer[:])
249
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diff changeset
213
1cc51d145af9 Further split up the containers.py; bugfix.
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diff changeset
214 def expandContent(self):
255
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diff changeset
215 self._expandWidthSpacer()
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parents: 249
diff changeset
216 if not self.vexpand and self.parent:return
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parents: 249
diff changeset
217 for widget in self.children:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 249
diff changeset
218 widget.height = self.height - 2*self.margins[1] - 2*self.border_size - self._extra_border[1]
249
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diff changeset
219
1cc51d145af9 Further split up the containers.py; bugfix.
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diff changeset
220 def xdelta(self,widget):return widget.width + self.padding
255
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diff changeset
221
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 249
diff changeset
222 class Spacer(object):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 249
diff changeset
223 """ A spacer represents expandable or fixed 'whitespace' in the GUI.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
224
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
225 In a XML file you can get this by adding a <Spacer /> inside a VBox or
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
226 HBox element (Windows implicitly are VBox elements).
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diff changeset
227
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
228 Attributes
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
229 ----------
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diff changeset
230
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
231 As with widgets a number of attributes can be set on a spacer (inside the XML definition).
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
232
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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233 - min_size: Int: The minimal size this Spacer is allowed to have.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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234 - max_size: Int: The maximal size this Spacer is allowed to have.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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235 - fixed_size: Int: Set min_size and max_size to the same vale - effectively a Fixed size spacer.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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236
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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237 """
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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238
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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239 ATTRIBUTES = [
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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240 IntAttr('min_size'), IntAttr('size'), IntAttr('max_size'),
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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241 IntAttr('fixed_size'),
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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242 ]
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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243
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
244 def __init__(self,parent=None,**kwargs):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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245 self.parent = parent
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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246 self.min_size = 0
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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247 self.max_size = 1000
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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248 self.size = 0
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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249
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
250 def __str__(self):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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251 return "Spacer(parent.name='%s')" % getattr(self.__parent,'name','None')
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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252
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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253 def __repr__(self):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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254 return "<Spacer(parent.name='%s') at %x>" % (getattr(self.__parent,'name','None'),id(self))
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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255
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
256 def _getSize(self):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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257 self.size = self._size
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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258 return self._size
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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259 def _setSize(self,size):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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260 self._size = max(self.min_size, min(self.max_size,size))
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
261 size = property(_getSize,_setSize)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
262
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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263 # Alias for size
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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264 width = property(_getSize,_setSize)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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265 height = property(_getSize,_setSize)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
266
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
267 def _setFixedSize(self,size):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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268 self.min_size = self.max_size = size
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
269 self.size = size
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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270 fixed_size = property(fset=_setFixedSize)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
271
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
272 def _isExpanding(self):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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273 if self.min_size < self.max_size:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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274 return 1
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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275 return 0
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
276 vexpand = property(_isExpanding)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
277 hexpand = property(_isExpanding)