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annotate engine/extensions/pychan/__init__.py @ 122:6b2f3a151f81

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* Small fixes (window icon, additional resolutions, svn:ignore)
author mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
date Tue, 05 Aug 2008 14:56:54 +0000
parents 4a0efb7baf70
children 9a1529f9625e
rev   line source
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 - Very 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 - ClickLabel/Label rework. (In progress)
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24
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25 - Documentation ( Allways not enough :-( )
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26 - Completion of above features
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27 - Wrap missing widgets: Slider
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28 - Handle Image Fonts
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29 - Move Font config files to XML, too ...
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30 - Add support for fixed size 'Spacers'
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31 - Add messageBox(text)
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32
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33 - Implement real Menus
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34 - Implement StackWidget
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35 - Then implement TabWidget
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36
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37 - GridLayout
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38 - Table
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39
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40 BUGS
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41 ----
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42 - Focus problems with Widget.execute.
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43 - Layout Bugs where max_size of a parent widget get's ignored.
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44 - Font.glyph_spacing is rendered incorrectly.
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45 - It just looks ugly.
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46
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47 Problems
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48 --------
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49 - Reference counting problems again -sigh-
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50 ... and thus possible leaks.
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51 - High amount of code reuse -> Complex code
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52 - Needs at least new style classes and other goodies.
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53 - Missing documentation on:
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54 - Styling
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55 - ScrollArea
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56 - Fonts
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57
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58 How to use
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59 ==========
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60
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61 At its core you only need a few functions.
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62 After setting up FIFE you need to initalize
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63 pychan. After that you can load a GUI from an
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64 XML file. Please see the documentation of L{loadXML}
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65 for the details of the XML format
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66 ::
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67 import pychan
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68 pychan.init(fifeEngine)
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69 guiElement = pychan.loadXML("contents/gui/myform.xml")
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70
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71 The resulting guiElement can be shown and hidden with the
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72 obvious L{widgets.Widget.show} and L{widgets.Widget.hide} methods.
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73
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74 To get a specific widget you have to give it a name in the XML
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75 definition and use that to extract the widget from the returned
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76 GUI element.
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77 ::
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78 okButton = guiElement.findChild(name="okButton")
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79 myInput = guiElement.findChild(name="myInput")
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80
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81 The data is extracted and set via direct attribute access.
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82 These are using the python property technique to hide
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83 behind the scenes manipulations. Please keep in mind that
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84 the Layout engine and the exact way the widgets are displayed
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85 is somewhat limited.
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86 ::
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87 myInput.text = "Blahblah"
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88 myList.items = ["1","2"]
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89 guiElement.position = (80,90)
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90
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91 A dialog without an OK button would be futile - so here's how
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92 you hook widget events to function calls. Every widget
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93 has a L{widgets.Widget.capture} method, which will directly call the passed
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94 function when an widget event occurs. As a convenience a
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95 L{widgets.Widget.mapEvents} function will batch the L{widgets.Widget.findChild} and
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96 L{widgets.Widget.capture} calls in an obvious way.
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97 ::
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98 myButton.capture( application.quit )
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99 guiElement.mapEvents({
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100 'okButton' : self.applyAndClose,
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101 'closeButton': guiElement.hide
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102 })
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103
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104 Other important places to look for information:
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105 - L{widgets.Widget} - Attributes explained.
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106 - L{loadXML} - Explain the XML format.
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107 - L{LayoutBase} - Working of the layout engine.
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108
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109 Initialization, data distribution and collection
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110 ================================================
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111
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112 Very often a dialogs text fields, labels and listboxes have to be filled with data
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113 after the creation of the dialog. This can be a tiresome process.
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114 After a dialog has executed, B{other} attributes have to be read out again,
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115 this to can be tiresome. PyChan simplifies both processes. But it treats them as three
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116 processes. One is setting the data that will never be read out again - called B{initial data} -
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117 the text of a checkbox or the list of a listBox are good examples. The second is setting the
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118 data that is mutable by the user and may be read out again - for example the state of a checkbox
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119 or the selected index in a list. The third and final process is collection of the user-mutable data::
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120 guiElement.distributeInitialData({
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121 'myListBox' : choices,
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122 'myLabel' : map.name,
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123 })
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124 guiElement.distributeData({
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125 'myTextField' : map.description
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126 })
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127 # ... process dialog.
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128 map.description, choice = guiElement.collectData('myListBox','myTextField')
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129 print "You selected:",choice,", good choice!"
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130
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131 See L{widgets.Widget.distributeData},L{widgets.Widget.distributeInitialData},
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132 L{widgets.Widget.collectData} and L{widgets.Widget.collectDataAsDict}.
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133
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134 Styling and font handling
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135 =========================
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136
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137 Note: These features are B{work in progress} and likely to change.
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138
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139 A style is a set of rules for matching widgets and a set of attributes
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140 applied to them after creation. The attributes can be any of the given
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141 attributes. Matching happens currently only by the widget class name
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142 itself.
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143
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144 As an example the following style - written as a python data structure -
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145 will set the border size of all labels to 10::
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146 style = {
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147 'ListBox' : { # Matches all listboxes
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148 'border_size : 10 # After creation call lisbox.border_size = 10
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149 }
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150 }
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151
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152 As a convenience you can use the string B{default} to match all widget
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153 classes and thus - for example apply a common font::
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154 style = {
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155 'default' : {
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156 'font' : 'console_small'
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157 }
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158 }
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159
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160 The font is set via a string identifier pulled from a font definition
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161 in a PyChan configuration file. You have to load these by calling
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162 L{loadFonts} in your startup code::
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163 import pychan
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164 pychan.init( fifeEngine )
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165 pychan.loadFonts( "content/fonts/console.fontdef" )
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166
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167 The font definition files are in the following format::
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168 [Font/FIRST_FONT_NAME]
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169
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170 type: truetype
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171 source: path/to/font.ttf
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172 # The font size in point
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173 size: 30
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174
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175 [Font/SECOND_FONT_NAME]
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176
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177 type: truetype
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178 source: content/fonts/samanata.ttf
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179 size: 8
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180
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181 # And so on.
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182
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183 I hope the example is clear enough ... Other options you can set:
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184
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185 - color: A list of comma separated integers from 0 to 255. White (255,255,255) by default.
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186 - antialias: Zero or one - enable or disable antialialising. Enabled by default.
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187 - row_spacing: Extra height per row. Default is 0.
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188 - glyph_spacing: Extra space per glyph. Default is 0. B{Currently buggy in the engine!}
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189
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190
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191 Widget hierachy
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192 ===============
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193
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194 Every widget can be contained in another container widget like L{Window}, L{VBox},
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195 L{HBox}, L{Container} or L{ScrollArea}. Container widgets can contain any number
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196 of widgets. Thus we have a tree like structure of the widgets - which finally makes
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197 up the window or frame that is placed on the screen.
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198
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199 In PyChan widgets are supposed to be manipulated via the root of this hierachy,
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200 so that the actual layout can be changed in the XML files without hassle.
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201 It can be compared to how HTML works.
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202
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203 These bits and pieces connect things up::
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204 - name - A (hopefully) unique name in the widget hierachy
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205 - findChildren - The accessor method to find widgets by name or any other attribute.
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206 - _parent - The parent widget in the widget hierachy
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207 - deepApply - The method used to walk over the widget hierachy. You have to reimplement
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208 this in case you want to provide custom widgets.
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209
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210 Wrapping machinery
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211 ==================
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212
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213 The wrapping mechanism works be redirecting attribute access to the Widget
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214 derived classes to a C{real_widget} member variable which in turn is an instance
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215 of the SWIG wrapped Guichan widget.
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216
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217 To ensure the real widget has already been constructed, when the wrapping machinery
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218 is already in use, this has to be the first attribute to set in the constructors.
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219 This leads to a reversed construction sequence as the super classes constructor
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220 has to be invoked I{after} the subclass specific construction has taken place.
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221
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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222 """
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223
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
224 __all__ = [
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diff changeset
225 'loadXML',
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diff changeset
226 'loadFonts',
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
227 'init',
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
228 'manager'
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
229 ]
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230
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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231 import fife, pythonize
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232
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
233 from widgets import *
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
234 from exceptions import *
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235
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
236 from fonts import loadFonts
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237
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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238 # Text munging befor adding it to TextBoxes
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239
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
240 ### Initialisation ###
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241
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242 manager = None
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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243 def init(engine,debug=False):
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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244 """
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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245 This has to be called before any other pychan methods can be used.
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diff changeset
246 It sets up a manager object which is available under pychan.manager.
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247
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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248 @param engine: The FIFE engine object.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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249 """
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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250 from manager import Manager
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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251 global manager
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
252 manager = Manager(engine,debug)
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253
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254
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
255 # XML Loader
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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256
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
257 from xml.sax import saxutils, handler
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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258 from traceback import print_exc
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259
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260 def traced(f):
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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261 """
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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262 Simple decorator that prints tracebacks for any exceptions occuring in a
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
263 function. Useful to avoid the infamous 'finally pops bad exception'
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
264 that shadows the real cause of the error ...
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265 """
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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266 def traced_f(*args,**kwargs):
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
267 try:
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diff changeset
268 return f(*args,**kwargs)
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diff changeset
269 except:
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diff changeset
270 print_exc()
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
271 raise
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272 return traced_f
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273
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
274 class _GuiLoader(object, handler.ContentHandler):
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diff changeset
275 def __init__(self):
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diff changeset
276 super(_GuiLoader,self).__init__()
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diff changeset
277 self.root = None
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278 self.indent = ""
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diff changeset
279 self.stack = []
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280
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281 def _printTag(self,name,attrs):
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282 if not manager.debug: return
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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283 attrstrings = map(lambda t: '%s="%s"' % tuple(map(str,t)),attrs.items())
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284 tag = "<%s " % name + " ".join(attrstrings) + ">"
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diff changeset
285 print self.indent + tag
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286
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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287 def _resolveTag(self,name):
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
288 """ Resolve a XML Tag to a PyChan GUI class. """
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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289 cls = WIDGETS.get(name,None)
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290 if cls is None and name == "Spacer":
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diff changeset
291 cls = Spacer
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292 if cls is None:
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293 raise GuiXMLError("Unknown GUI Element: %s" % name)
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diff changeset
294 return cls
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295
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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296 def _setAttr(self,obj,name,value):
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diff changeset
297 if not hasattr(obj.__class__,'ATTRIBUTES'):
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diff changeset
298 raise PyChanException("The registered widget/spacer class %s does not supply an 'ATTRIBUTES'."
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
299 % repr(obj))
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
300 try:
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
301 for attr in obj.ATTRIBUTES:
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
302 if attr.name == name:
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
303 attr.set(obj,value)
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
304 return
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
305 except GuiXMLError, e:
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
306 raise GuiXMLError("Error parsing attr '%s'='%s' for '%s': '%s'" % (name,value,obj,e))
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
307 raise GuiXMLError("Unknown GUI Attribute '%s' on '%s'" % (name,repr(obj)))
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diff changeset
308
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
309 def startElement(self, name, attrs):
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
310 self._printTag(name,attrs)
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
311 cls = self._resolveTag(name)
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
312 if issubclass(cls,Widget):
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
313 self.stack.append('gui_element')
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
314 self._createInstance(cls,name,attrs)
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
315 elif cls == Spacer:
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
316 self.stack.append('spacer')
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
317 self._createSpacer(cls,name,attrs)
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
318 else:
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
319 self.stack.append('unknown')
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
320 self.indent += " "*4
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
321
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
322 def _createInstance(self,cls,name,attrs):
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
323 obj = cls(parent=self.root)
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
324 for k,v in attrs.items():
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
325 self._setAttr(obj,k,v)
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
326
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
327 if self.root:
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
328 self.root.addChild( obj )
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
329 self.root = obj
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
330
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
331 def _createSpacer(self,cls,name,attrs):
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332 obj = cls(parent=self.root)
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333 if hasattr(self.root,'add'):
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334 self.root.addSpacer(obj)
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335 else:
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336 raise GuiXMLError("A spacer needs to be added to a container widget!")
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337 self.root = obj
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338
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339 def endElement(self, name):
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340 self.indent = self.indent[:-4]
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341 if manager.debug: print self.indent + "</%s>" % name
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342 if self.stack.pop() in ('gui_element','spacer'):
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343 self.root = self.root._parent or self.root
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344
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345 def loadXML(filename_or_stream):
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346 """
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347 Loads a PyChan XML file and generates a widget from it.
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348
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349 @param filename_or_stream: A filename or a file-like object (for example using StringIO).
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350
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351 The XML format is very dynamic, in the sense, that the actual allowed tags and attributes
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352 depend on the PyChan code.
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353
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354 So when a tag C{Button} is encountered, an instance of class Button will be generated,
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355 and added to the parent object.
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356 All attributes will then be parsed and then set in the following way:
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357
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358 - position,size,min_size,max_size,margins - These are assumed to be comma separated tuples
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359 of integers.
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360 - foreground_color,base_color,background_color - These are assumed to be triples of comma
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361 separated integers.
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362 - opaque,border_size,padding - These are assumed to be simple integers.
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363
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364 All other attributes are set verbatim as strings on the generated instance.
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365 In case a Widget does not accept an attribute to be set or the attribute can not be parsed
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366 correctly, the function will raise a GuiXMLError.
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367
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368 In short::
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369 <VBox>
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370 <Button text="X" min_size="20,20" base_color="255,0,0" border_size="2" />
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371 </VBox>
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372
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373 This result in the following code executed::
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374
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375 vbox = VBox(parent=None)
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376 button = Button(parent=vbox)
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377 button.text = "X"
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378 button.min_size = (20,20)
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379 button.base_color = (255,0,0)
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diff changeset
380 button.border_size = 2
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diff changeset
381 vbox.add( button )
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382 """
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diff changeset
383 from xml.sax import parse
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diff changeset
384 loader = _GuiLoader()
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diff changeset
385 parse(filename_or_stream,loader)
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diff changeset
386 return loader.root
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387
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388 def setupModalExecution(mainLoop,breakFromMainLoop):
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389 """
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
390 Setup the synchronous dialog execution feature.
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diff changeset
391
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392 You can enable synchronous dialog execution by
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
393 passing to functions to this function.
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diff changeset
394
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
395 @param mainLoop: Function - This is regarded as the applications
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
396 main loop, which should be able to be called recursively.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
397 It should not take no arguments and return the argument
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
398 passed to the second function (breakFromMainLoop).
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
399
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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400 @param breakFromMainLoop: Function -This function should cause the
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
401 first function to finish and return the passed argument.
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diff changeset
402
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diff changeset
403 With these to functions dialogs can be executed synchronously.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
404 See L{widgets.Widget.execute}.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
405 """
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
406 if not manager:
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
407 raise InitializationError("PyChan is not initialized yet.")
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
408 manager.setupModalExecution(mainLoop,breakFromMainLoop)