Mercurial > fife-parpg
annotate engine/extensions/pychan/__init__.py @ 213:b0c4e6e41659
- yet another fix for the "funny typo" - of course it should be RGBA, not RBGA ...
author | chewie@33b003aa-7bff-0310-803a-e67f0ece8222 |
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date | Mon, 16 Mar 2009 15:54:14 +0000 |
parents | 54bfd1015b35 |
children | 724f3a5f3e96 |
rev | line source |
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0
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1 # coding: utf-8 |
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2 |
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3 """\ |
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4 Pythonic Guichan Wrapper - PyChan |
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5 ================================= |
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6 |
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7 Pythonic GUI API. |
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8 |
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9 Features |
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10 -------- |
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11 - Simpler Interface |
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12 - Very Basic XML Format support |
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13 - Basic Layout Engine |
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14 - Pseudo-Synchronous Dialogs. |
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15 - Automagic background tiling (WIP) |
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16 - Basic Styling support. |
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17 - Simple Font Handling |
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18 |
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19 TODO |
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20 ---- |
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21 - Make setting parent attribute imply containment relation. |
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22 - Finalize Widget.execute |
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23 |
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24 - Documentation ( Allways not enough :-( ) |
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25 - Handle Image Fonts |
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26 - Move Font config files to XML, too ... |
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27 |
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28 - Implement real Menus |
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29 - Implement StackWidget |
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30 - Then implement TabWidget |
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31 |
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32 - GridLayout |
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33 - Table |
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34 |
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35 BUGS |
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36 ---- |
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37 - Focus problems with Widget.execute. |
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38 - Font.glyph_spacing is rendered incorrectly. |
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39 - Is this a bug? At least inconvenient. MouseEntered events are not distributed for freshly shown widget. |
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40 - It just looks bad. |
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41 |
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42 Problems |
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43 -------- |
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44 - Reference counting problems again -sigh- |
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45 ... and thus possible leaks. |
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46 - High amount of code reuse -> Complex code |
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47 - Needs at least new style classes and other goodies. |
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48 - Missing documentation on: |
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49 - Styling |
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50 - ScrollArea |
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51 - Fonts |
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52 |
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53 How to use |
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54 ========== |
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55 |
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56 At its core you only need a few functions. |
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57 After setting up FIFE you need to initalize |
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58 pychan. After that you can load a GUI from an |
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59 XML file. Please see the documentation of L{loadXML} |
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60 for the details of the XML format |
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61 :: |
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62 import pychan |
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63 pychan.init(fifeEngine) |
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64 guiElement = pychan.loadXML("contents/gui/myform.xml") |
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65 |
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66 The resulting guiElement can be shown and hidden with the |
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67 obvious L{widgets.Widget.show} and L{widgets.Widget.hide} methods. |
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68 |
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69 To get a specific widget you have to give it a name in the XML |
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70 definition and use that to extract the widget from the returned |
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71 GUI element. |
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72 :: |
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73 okButton = guiElement.findChild(name="okButton") |
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74 myInput = guiElement.findChild(name="myInput") |
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75 |
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76 The data is extracted and set via direct attribute access. |
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77 These are using the python property technique to hide |
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78 behind the scenes manipulations. Please keep in mind that |
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79 the Layout engine and the exact way the widgets are displayed |
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80 is somewhat limited. |
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81 :: |
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82 myInput.text = "Blahblah" |
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83 myList.items = ["1","2"] |
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84 guiElement.position = (80,90) |
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85 |
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86 A dialog without an OK button would be futile - so here's how |
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87 you hook widget events to function calls. Every widget |
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88 has a L{widgets.Widget.capture} method, which will directly call the passed |
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89 function when an widget event occurs. As a convenience a |
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90 L{widgets.Widget.mapEvents} function will batch the L{widgets.Widget.findChild} and |
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91 L{widgets.Widget.capture} calls in an obvious way. |
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92 :: |
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93 myButton.capture( application.quit ) |
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94 guiElement.mapEvents({ |
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95 'okButton' : self.applyAndClose, |
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96 'closeButton': guiElement.hide |
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97 }) |
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98 |
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99 Other important places to look for information: |
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100 - L{widgets.Widget} - Attributes explained. |
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101 - L{loadXML} - Explain the XML format. |
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102 - L{LayoutBase} - Working of the layout engine. |
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103 |
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104 Initialization, data distribution and collection |
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105 ================================================ |
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106 |
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107 Very often a dialogs text fields, labels and listboxes have to be filled with data |
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108 after the creation of the dialog. This can be a tiresome process. |
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109 After a dialog has executed, B{other} attributes have to be read out again, |
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110 this to can be tiresome. PyChan simplifies both processes. But it treats them as three |
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111 processes. One is setting the data that will never be read out again - called B{initial data} - |
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112 the text of a checkbox or the list of a listBox are good examples. The second is setting the |
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113 data that is mutable by the user and may be read out again - for example the state of a checkbox |
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114 or the selected index in a list. The third and final process is collection of the user-mutable data:: |
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115 guiElement.distributeInitialData({ |
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116 'myListBox' : choices, |
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117 'myLabel' : map.name, |
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118 }) |
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119 guiElement.distributeData({ |
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120 'myTextField' : map.description |
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121 }) |
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122 # ... process dialog. |
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123 map.description, choice = guiElement.collectData('myListBox','myTextField') |
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124 print "You selected:",choice,", good choice!" |
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125 |
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126 See L{widgets.Widget.distributeData},L{widgets.Widget.distributeInitialData}, |
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127 L{widgets.Widget.collectData} and L{widgets.Widget.collectDataAsDict}. |
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128 |
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129 Styling and font handling |
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130 ========================= |
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131 |
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132 Note: These features are B{work in progress} and likely to change. |
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133 |
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134 A style is a set of rules for matching widgets and a set of attributes |
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135 applied to them after creation. The attributes can be any of the given |
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136 attributes. Matching happens currently only by the widget class name |
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137 itself. |
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138 |
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139 As an example the following style - written as a python data structure - |
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140 will set the border size of all labels to 10:: |
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141 style = { |
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142 'ListBox' : { # Matches all listboxes |
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143 'border_size : 10 # After creation call lisbox.border_size = 10 |
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144 } |
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145 } |
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146 |
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147 As a convenience you can use the string B{default} to match all widget |
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148 classes and thus - for example apply a common font:: |
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149 style = { |
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150 'default' : { |
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151 'font' : 'console_small' |
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152 } |
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153 } |
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154 |
205
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155 A new style is added to pychan with L{internal.Manager.addStyle}. |
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156 |
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157 The font is set via a string identifier pulled from a font definition |
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158 in a PyChan configuration file. You have to load these by calling |
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159 L{loadFonts} in your startup code:: |
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160 import pychan |
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161 pychan.init( fifeEngine ) |
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162 pychan.loadFonts( "content/fonts/console.fontdef" ) |
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163 |
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164 The font definition files are in the following format:: |
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165 [Font/FIRST_FONT_NAME] |
188
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166 |
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167 type: truetype |
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168 source: path/to/font.ttf |
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169 # The font size in point |
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170 size: 30 |
188
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171 |
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172 [Font/SECOND_FONT_NAME] |
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173 |
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174 type: truetype |
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175 source: content/fonts/samanata.ttf |
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176 size: 8 |
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177 |
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178 # And so on. |
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179 |
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180 I hope the example is clear enough ... Other options you can set: |
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181 |
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182 - color: A list of comma separated integers from 0 to 255. White (255,255,255) by default. |
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183 - antialias: Zero or one - enable or disable antialialising. Enabled by default. |
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184 - row_spacing: Extra height per row. Default is 0. |
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185 - glyph_spacing: Extra space per glyph. Default is 0. B{Currently buggy in the engine!} |
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186 |
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187 |
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188 Widget hierachy |
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189 =============== |
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190 |
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191 Every widget can be contained in another container widget like L{Window}, L{VBox}, |
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192 L{HBox}, L{Container} or L{ScrollArea}. Container widgets can contain any number |
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193 of widgets. Thus we have a tree like structure of the widgets - which finally makes |
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194 up the window or frame that is placed on the screen. |
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195 |
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196 In PyChan widgets are supposed to be manipulated via the root of this hierachy, |
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197 so that the actual layout can be changed in the XML files without hassle. |
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198 It can be compared to how HTML works. |
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199 |
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200 These bits and pieces connect things up:: |
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201 - name - A (hopefully) unique name in the widget hierachy |
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202 - findChildren - The accessor method to find widgets by name or any other attribute. |
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203 - _parent - The parent widget in the widget hierachy |
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204 - deepApply - The method used to walk over the widget hierachy. You have to reimplement |
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205 this in case you want to provide custom widgets. |
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206 |
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207 Wrapping machinery |
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208 ================== |
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209 |
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210 The wrapping mechanism works be redirecting attribute access to the Widget |
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211 derived classes to a C{real_widget} member variable which in turn is an instance |
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212 of the SWIG wrapped Guichan widget. |
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213 |
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214 To ensure the real widget has already been constructed, when the wrapping machinery |
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215 is already in use, this has to be the first attribute to set in the constructors. |
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216 This leads to a reversed construction sequence as the super classes constructor |
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217 has to be invoked I{after} the subclass specific construction has taken place. |
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218 |
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219 """ |
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220 |
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221 __all__ = [ |
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222 'loadXML', |
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223 'loadFonts', |
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224 'init', |
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225 'manager' |
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226 ] |
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227 |
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228 from widgets import * |
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229 from exceptions import * |
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230 |
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231 from fonts import loadFonts |
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232 |
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233 # Text munging befor adding it to TextBoxes |
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234 |
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235 ### Initialisation ### |
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236 |
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237 manager = None |
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238 def init(engine,debug=False): |
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239 """ |
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240 This has to be called before any other pychan methods can be used. |
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241 It sets up a manager object which is available under pychan.manager. |
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242 |
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243 @param engine: The FIFE engine object. |
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244 """ |
205
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245 from compat import _munge_engine_hook |
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246 from internal import Manager |
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247 global manager |
205
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248 |
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249 manager = Manager(_munge_engine_hook(engine),debug) |
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250 |
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251 # XML Loader |
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252 |
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253 from xml.sax import saxutils, handler |
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254 from traceback import print_exc |
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255 |
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256 def traced(f): |
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257 """ |
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258 Simple decorator that prints tracebacks for any exceptions occuring in a |
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259 function. Useful to avoid the infamous 'finally pops bad exception' |
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260 that shadows the real cause of the error ... |
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261 """ |
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262 def traced_f(*args,**kwargs): |
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263 try: |
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264 return f(*args,**kwargs) |
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265 except: |
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266 print_exc() |
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267 raise |
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268 return traced_f |
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269 |
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270 class _GuiLoader(object, handler.ContentHandler): |
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271 def __init__(self): |
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272 super(_GuiLoader,self).__init__() |
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273 self.root = None |
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274 self.indent = "" |
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275 self.stack = [] |
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276 |
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277 def _printTag(self,name,attrs): |
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278 if not manager.debug: return |
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279 attrstrings = map(lambda t: '%s="%s"' % tuple(map(str,t)),attrs.items()) |
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280 tag = "<%s " % name + " ".join(attrstrings) + ">" |
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281 print self.indent + tag |
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282 |
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283 def _resolveTag(self,name): |
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284 """ Resolve a XML Tag to a PyChan GUI class. """ |
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285 cls = WIDGETS.get(name,None) |
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286 if cls is None and name == "Spacer": |
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287 cls = Spacer |
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288 if cls is None: |
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289 raise GuiXMLError("Unknown GUI Element: %s" % name) |
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290 return cls |
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291 |
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292 def _setAttr(self,obj,name,value): |
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293 if not hasattr(obj.__class__,'ATTRIBUTES'): |
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294 raise PyChanException("The registered widget/spacer class %s does not supply an 'ATTRIBUTES'." |
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295 % repr(obj)) |
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296 try: |
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297 for attr in obj.ATTRIBUTES: |
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298 if attr.name == name: |
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299 attr.set(obj,value) |
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300 return |
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301 except GuiXMLError, e: |
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302 raise GuiXMLError("Error parsing attr '%s'='%s' for '%s': '%s'" % (name,value,obj,e)) |
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303 raise GuiXMLError("Unknown GUI Attribute '%s' on '%s'" % (name,repr(obj))) |
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304 |
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305 def startElement(self, name, attrs): |
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306 self._printTag(name,attrs) |
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307 cls = self._resolveTag(name) |
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308 if issubclass(cls,Widget): |
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309 self.stack.append('gui_element') |
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310 self._createInstance(cls,name,attrs) |
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311 elif cls == Spacer: |
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312 self.stack.append('spacer') |
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313 self._createSpacer(cls,name,attrs) |
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314 else: |
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315 self.stack.append('unknown') |
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316 self.indent += " "*4 |
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317 |
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318 def _createInstance(self,cls,name,attrs): |
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319 obj = cls(parent=self.root) |
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320 for k,v in attrs.items(): |
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321 self._setAttr(obj,k,v) |
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322 |
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323 if self.root: |
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324 self.root.addChild( obj ) |
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325 self.root = obj |
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326 |
0
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327 def _createSpacer(self,cls,name,attrs): |
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328 obj = cls(parent=self.root) |
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329 for k,v in attrs.items(): |
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330 self._setAttr(obj,k,v) |
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331 |
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332 if hasattr(self.root,'add'): |
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333 self.root.addSpacer(obj) |
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334 else: |
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335 raise GuiXMLError("A spacer needs to be added to a container widget!") |
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336 self.root = obj |
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337 |
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338 def endElement(self, name): |
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339 self.indent = self.indent[:-4] |
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340 if manager.debug: print self.indent + "</%s>" % name |
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341 if self.stack.pop() in ('gui_element','spacer'): |
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342 self.root = self.root._parent or self.root |
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343 |
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344 def loadXML(filename_or_stream): |
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345 """ |
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346 Loads a PyChan XML file and generates a widget from it. |
129
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347 |
0
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348 @param filename_or_stream: A filename or a file-like object (for example using StringIO). |
129
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349 |
0
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350 The XML format is very dynamic, in the sense, that the actual allowed tags and attributes |
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351 depend on the PyChan code. |
129
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352 |
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353 So when a tag C{Button} is encountered, an instance of class Button will be generated, |
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354 and added to the parent object. |
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355 All attributes will then be parsed and then set in the following way: |
129
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356 |
0
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357 - position,size,min_size,max_size,margins - These are assumed to be comma separated tuples |
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358 of integers. |
171
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- small fix for pychan documentation (colors can also be quadruples)
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359 - foreground_color,base_color,background_color - These are assumed to be triples or quadruples of comma |
213
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- yet another fix for the "funny typo" - of course it should be RGBA, not RBGA ...
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360 separated integers. (triples: r,g,b; quadruples: r,g,b,a) |
0
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361 - opaque,border_size,padding - These are assumed to be simple integers. |
129
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362 |
0
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363 All other attributes are set verbatim as strings on the generated instance. |
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364 In case a Widget does not accept an attribute to be set or the attribute can not be parsed |
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365 correctly, the function will raise a GuiXMLError. |
129
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366 |
0
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367 In short:: |
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368 <VBox> |
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369 <Button text="X" min_size="20,20" base_color="255,0,0" border_size="2" /> |
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370 </VBox> |
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371 |
0
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372 This result in the following code executed:: |
129
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373 |
0
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374 vbox = VBox(parent=None) |
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375 button = Button(parent=vbox) |
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376 button.text = "X" |
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377 button.min_size = (20,20) |
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378 button.base_color = (255,0,0) |
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379 button.border_size = 2 |
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380 vbox.add( button ) |
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381 """ |
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382 from xml.sax import parse |
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383 loader = _GuiLoader() |
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|
384 parse(filename_or_stream,loader) |
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385 return loader.root |
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386 |
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387 def setupModalExecution(mainLoop,breakFromMainLoop): |
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388 """ |
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389 Setup the synchronous dialog execution feature. |
129
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390 |
0
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391 You can enable synchronous dialog execution by |
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392 passing to functions to this function. |
129
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393 |
0
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394 @param mainLoop: Function - This is regarded as the applications |
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395 main loop, which should be able to be called recursively. |
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396 It should not take no arguments and return the argument |
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397 passed to the second function (breakFromMainLoop). |
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* Indentation patch by GreyGhost
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398 |
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* Datasets becomes the new trunk and retires after that :-)
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399 @param breakFromMainLoop: Function -This function should cause the |
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* Datasets becomes the new trunk and retires after that :-)
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400 first function to finish and return the passed argument. |
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* Indentation patch by GreyGhost
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401 |
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* Datasets becomes the new trunk and retires after that :-)
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402 With these to functions dialogs can be executed synchronously. |
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* Datasets becomes the new trunk and retires after that :-)
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403 See L{widgets.Widget.execute}. |
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* Datasets becomes the new trunk and retires after that :-)
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404 """ |
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* Datasets becomes the new trunk and retires after that :-)
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405 if not manager: |
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* Datasets becomes the new trunk and retires after that :-)
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406 raise InitializationError("PyChan is not initialized yet.") |
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* Datasets becomes the new trunk and retires after that :-)
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407 manager.setupModalExecution(mainLoop,breakFromMainLoop) |