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annotate engine/extensions/pychan/autoposition.py @ 331:48c99636453e

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Added Licence header to all pypthon modules in extension/ Commit 3k, Yay :-)
author phoku@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 24 Aug 2009 12:01:34 +0000
parents 54bfd1015b35
children dfd48d49c044
rev   line source
331
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1 #!/usr/bin/env python
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2 # -*- coding: utf-8 -*-
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3
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4 # ####################################################################
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5 # Copyright (C) 2005-2009 by the FIFE team
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6 # http://www.fifengine.de
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7 # This file is part of FIFE.
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8 #
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9 # FIFE is free software; you can redistribute it and/or
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10 # modify it under the terms of the GNU Lesser General Public
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11 # License as published by the Free Software Foundation; either
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12 # version 2.1 of the License, or (at your option) any later version.
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13 #
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14 # This library is distributed in the hope that it will be useful,
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15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 # Lesser General Public License for more details.
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18 #
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19 # You should have received a copy of the GNU Lesser General Public
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20 # License along with this library; if not, write to the
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21 # Free Software Foundation, Inc.,
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22 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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23 # ####################################################################
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24
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25 """
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26 Automatic widget positioning
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27 ============================
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28
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29 You can use the C{position_techinque} attribute
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30 on top level widgets which can also be set from xml.
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31
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32 For direct use call L{placeWidget}.
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33 """
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34
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35 from internal import screen_width, screen_height
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36 from exceptions import PyChanException
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37
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38 EXPLICIT = "explicit"
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39 AUTOMATIC = "automatic"
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40
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41 TOP = "top"
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42 LEFT = "left"
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43 RIGHT = "right"
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44 CENTER = "center"
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45 BOTTOM = "bottom"
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46
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47
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48 def _splicePosition(p):
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49 if "+" in p:
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50 technique,delta = p.split("+")
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51 elif "-" in p:
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52 technique,delta = p.split("-")
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53 delta = '-' + delta
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54 else:
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55 technique,delta = p,0
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56 delta = int(delta)
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57 return technique,delta
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58
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59 def _parsePosition(position):
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60 try:
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61 if position == AUTOMATIC:
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62 position = "center+0:center+0"
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63
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64 x_pos,y_pos = position.split(":")
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65 x_pos, x_delta = _splicePosition(x_pos)
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66 y_pos, y_delta = _splicePosition(y_pos)
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67
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68 if x_pos not in [EXPLICIT,LEFT,CENTER,RIGHT]:
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69 raise
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70 if y_pos not in [EXPLICIT,TOP,CENTER,BOTTOM]:
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71 raise
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72 except:
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73 raise PyChanException("Malformed position definition: " + repr(position))
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74 return x_pos,x_delta,y_pos,y_delta
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75
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76 def placeWidget(widget,position):
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77 """
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78 Place a widget according to a string defining relative coordinates to screen borders.
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79
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80 The position definition has to be of the form: C{"<x_pos><x_delta>:<y_pos><y_delta>"}
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81
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82 C{<x_pos>} may be one of:
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83 - left
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84 - right
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85 - center
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86 - explicit
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87
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88 C{<y_pos>} may be one of:
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89 - top
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90 - bottom
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91 - center
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92 - explicit
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93
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94 C{explicit} means that the widgets x or y position will not be touched. The rest should be
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95 self explanatory.
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96
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97 C{<x_delta>} and C{<y_delta>} must be of the form: +pixel_number or -pixel_number. Or comletely
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98 omitted. Note that the sign has to be there for for positive deltas, too.
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99
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100 For brevity two shortcuts exist:
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101 - "explict" -> "explict:explict"
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102 - "automatic" -> "center:center"
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103
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104 A few examples::
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105 "right-20:top"
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106 "center:top+10"
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107 "center:center"
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108
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109 @param widget: The PyChan widget.
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110 @param position: A position definition.
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111
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112 If the position cannot be parsed a L{PyChanException} is thrown.
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113
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114 """
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115 if position == EXPLICIT:
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116 return
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117 x_pos,x_delta,y_pos,y_delta = _parsePosition(position)
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118
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119 x,y = widget.position
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120 w,h = widget.size
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121
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122 if x_pos == CENTER:
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123 x = (screen_width()-w)/2 + x_delta
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124
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125 if y_pos == CENTER:
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126 y = (screen_height()-h)/2 + y_delta
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127
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128 if x_pos == LEFT:
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129 x = x_delta
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130
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131 if y_pos == TOP:
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132 y = y_delta
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133
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134 if x_pos == RIGHT:
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135 x = screen_width() - w + x_delta
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136
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137 if y_pos == BOTTOM:
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138 y = screen_height() - h + y_delta
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139
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140 widget.position = x,y
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141
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142
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143