Mercurial > fife-parpg

annotate engine/extensions/pychan/autoposition.py @ 228:756b895e1dab

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Merged unicode-support back into trunk. Now all GUI/visible strings should be unicode. Internal strings unchanged. Remember to use a font that actually has the desired codepoints. Current default unicode policiy is 'ignore'.
author phoku@33b003aa-7bff-0310-803a-e67f0ece8222
date Sat, 21 Mar 2009 10:38:11 +0000
parents 54bfd1015b35
children 48c99636453e
rev   line source
205
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1 # coding: utf-8
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2
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3 """
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4 Automatic widget positioning
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5 ============================
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6
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7 You can use the C{position_techinque} attribute
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8 on top level widgets which can also be set from xml.
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9
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10 For direct use call L{placeWidget}.
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11 """
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12
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13 from internal import screen_width, screen_height
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14 from exceptions import PyChanException
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15
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16 EXPLICIT = "explicit"
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17 AUTOMATIC = "automatic"
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18
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19 TOP = "top"
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20 LEFT = "left"
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21 RIGHT = "right"
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22 CENTER = "center"
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23 BOTTOM = "bottom"
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24
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25
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26 def _splicePosition(p):
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27 if "+" in p:
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28 technique,delta = p.split("+")
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29 elif "-" in p:
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30 technique,delta = p.split("-")
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31 delta = '-' + delta
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32 else:
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33 technique,delta = p,0
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34 delta = int(delta)
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35 return technique,delta
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36
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37 def _parsePosition(position):
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38 try:
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39 if position == AUTOMATIC:
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40 position = "center+0:center+0"
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41
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42 x_pos,y_pos = position.split(":")
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43 x_pos, x_delta = _splicePosition(x_pos)
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44 y_pos, y_delta = _splicePosition(y_pos)
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45
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46 if x_pos not in [EXPLICIT,LEFT,CENTER,RIGHT]:
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47 raise
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48 if y_pos not in [EXPLICIT,TOP,CENTER,BOTTOM]:
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49 raise
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50 except:
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51 raise PyChanException("Malformed position definition: " + repr(position))
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52 return x_pos,x_delta,y_pos,y_delta
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53
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54 def placeWidget(widget,position):
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55 """
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56 Place a widget according to a string defining relative coordinates to screen borders.
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57
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58 The position definition has to be of the form: C{"<x_pos><x_delta>:<y_pos><y_delta>"}
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59
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60 C{<x_pos>} may be one of:
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61 - left
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62 - right
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63 - center
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64 - explicit
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65
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66 C{<y_pos>} may be one of:
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67 - top
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68 - bottom
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69 - center
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70 - explicit
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71
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72 C{explicit} means that the widgets x or y position will not be touched. The rest should be
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73 self explanatory.
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74
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75 C{<x_delta>} and C{<y_delta>} must be of the form: +pixel_number or -pixel_number. Or comletely
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76 omitted. Note that the sign has to be there for for positive deltas, too.
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77
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78 For brevity two shortcuts exist:
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79 - "explict" -> "explict:explict"
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80 - "automatic" -> "center:center"
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81
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82 A few examples::
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83 "right-20:top"
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84 "center:top+10"
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85 "center:center"
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86
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87 @param widget: The PyChan widget.
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88 @param position: A position definition.
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89
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90 If the position cannot be parsed a L{PyChanException} is thrown.
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91
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92 """
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93 if position == EXPLICIT:
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94 return
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95 x_pos,x_delta,y_pos,y_delta = _parsePosition(position)
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96
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97 x,y = widget.position
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98 w,h = widget.size
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99
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100 if x_pos == CENTER:
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101 x = (screen_width()-w)/2 + x_delta
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102
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103 if y_pos == CENTER:
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104 y = (screen_height()-h)/2 + y_delta
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105
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106 if x_pos == LEFT:
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107 x = x_delta
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108
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109 if y_pos == TOP:
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110 y = y_delta
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111
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112 if x_pos == RIGHT:
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113 x = screen_width() - w + x_delta
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114
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115 if y_pos == BOTTOM:
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116 y = screen_height() - h + y_delta
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117
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118 widget.position = x,y
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119
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120
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121