Mercurial > rinkhals

annotate gamelib/savegame.py @ 491:75ef6ea3b7a6

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Start of support for save game snapshots.
author Simon Cross <hodgestar@gmail.com>
date Wed, 25 Nov 2009 22:12:08 +0000
parents 8897a436a8cb
children bf90a2948e34
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rev   line source
486
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1 """Utilities and widgets for saving and restoring games."""
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2
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3 import xmlrpclib
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4 import os
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5
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6 from pgu import gui
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7
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8 import config
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9 import version
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10
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11 def open_save_game(fullpath):
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12 """Open a save game file."""
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13 try:
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14 xml = open(fullpath, "rb").read()
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15 params, methodname = xmlrpclib.loads(xml)
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16 if methodname != "foxassault":
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17 raise SaveGameError("File does not appear to be a "
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18 "Fox Assault save game.")
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19 save_version = params[0]
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20 if save_version != version.SAVE_GAME_VERSION:
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21 raise SaveGameError("Incompatible save game version.")
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22 data = params[1]
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23 except Exception, e:
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24 raise SaveGameError("Failed to load game: %s" % (e,))
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25
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26 return data, None
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27
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28
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29 class SaveGameError(Exception):
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30 pass
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31
486
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32
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33 class BaseSaveRestoreDialog(gui.Dialog):
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34 """Save game dialog."""
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35
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36 def __init__(self, title_txt, button_txt, allow_new, cls="dialog"):
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37 self.value = None
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38 self.save_folder = config.config.save_folder
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39
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40 self.save_games = {}
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41 self._populate_save_games()
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42
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43 if allow_new:
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44 self.name_input = gui.Input()
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45 else:
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46 self.name_input = None
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47
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48 td_style = {
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49 'padding_left': 4,
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50 'padding_right': 4,
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51 'padding_top': 2,
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52 'padding_bottom': 2,
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53 }
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54
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55 self.save_list = gui.List(width=350, height=250)
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56 games = self.save_games.keys()
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57 games.sort()
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58 for name in games:
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59 self.save_list.add(name, value=name)
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60 self.save_list.set_vertical_scroll(0)
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61 self.save_list.connect(gui.CHANGE, self._save_list_change)
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62
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63 self.image_container = gui.Container()
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64
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65 button_ok = gui.Button(button_txt)
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66 button_ok.connect(gui.CLICK, self._click_ok)
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67
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68 button_cancel = gui.Button("Cancel")
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69 button_cancel.connect(gui.CLICK, self._click_cancel)
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70
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71 body = gui.Table()
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72 body.tr()
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73 body.td(self.save_list, style=td_style, colspan=2)
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74 body.td(self.image_container, style=td_style, colspan=2)
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75 body.tr()
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76 if self.name_input:
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77 body.td(gui.Label("Save as:"), style=td_style, align=1)
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78 body.td(self.name_input, style=td_style)
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79 else:
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80 body.td(gui.Spacer(0, 0), style=td_style, colspan=2)
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81 body.td(button_ok, style=td_style, align=1)
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82 body.td(button_cancel, style=td_style, align=1)
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83
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84 title = gui.Label(title_txt, cls=cls + ".title.label")
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85 gui.Dialog.__init__(self, title, body)
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86
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87 def get_fullpath(self):
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88 """Return the fullpath of the select save game file or None."""
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89 if self.value is None:
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90 return None
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91 return os.path.join(self.save_folder, self.value + ".xml")
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92
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93 def _populate_save_games(self):
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94 """Read list of save games."""
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95 for filename in os.listdir(self.save_folder):
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96 fullpath = os.path.join(self.save_folder, filename)
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97 root, ext = os.path.splitext(filename)
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98 if not os.path.isfile(fullpath):
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99 continue
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100 if ext != ".xml":
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101 continue
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102 self.save_games[root] = self._create_image_widget(fullpath)
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103
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104 def _create_image_widget(self, fullpath):
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105 """Create an image showing the contents of a save game file."""
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106 try:
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107 data, screenshot = open_save_game(fullpath)
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108 except SaveGameError:
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109 return gui.Label("Bad Save Game")
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110
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111 if screenshot is None:
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112 return gui.Label("No screenshot")
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113
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114 return gui.Image(screenshot)
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115
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116 def _save_list_change(self):
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117 if self.name_input:
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118 self.name_input.value = self.save_list.value
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119
491
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120 for w in self.image_container.widgets:
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121 self.image_container.remove(w)
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122
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123 image_widget = self.save_games[self.save_list.value]
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124 self.image_container.add(image_widget, 0, 0)
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125
486
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126 def _click_ok(self):
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127 if self.name_input:
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128 self.value = self.name_input.value
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129 else:
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130 self.value = self.save_list.value
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131 if self.value:
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132 self.send(gui.CHANGE)
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133 self.close()
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134
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135 def _click_cancel(self):
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136 self.value = None
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137 self.send(gui.CHANGE)
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138 self.close()
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139
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140
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141 class SaveDialog(BaseSaveRestoreDialog):
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142 """Save game dialog."""
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143
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144 def __init__(self, gameboard):
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145 BaseSaveRestoreDialog.__init__(self, "Save Game ...", "Save", allow_new=True)
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146 self.connect(gui.CHANGE, self._save, gameboard)
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147
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148 def _save(self, gameboard):
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149 filename = self.get_fullpath()
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150 if filename is None:
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151 return
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152 data = gameboard.save_game()
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153 params = (version.SAVE_GAME_VERSION, data)
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154 xml = xmlrpclib.dumps(params, "foxassault")
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155 try:
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156 open(filename, "wb").write(xml)
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157 except Exception, e:
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158 print "Failed to save game: %s" % (e,)
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159
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160
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161 class RestoreDialog(BaseSaveRestoreDialog):
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162 """Restore game dialog."""
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163
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164 def __init__(self, gameboard):
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165 BaseSaveRestoreDialog.__init__(self, "Load Game ...", "Load", allow_new=False)
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166 self.connect(gui.CHANGE, self._restore, gameboard)
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167
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168 def _restore(self, gameboard):
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169 filename = self.get_fullpath()
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170 if filename is None:
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171 return
491
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172
486
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173 try:
491
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174 data, screenshot = open_save_game(filename)
486
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175 except Exception, e:
491
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176 print "Failed to load game: %s" % (e,)
486
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177 return
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178
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179 gameboard.restore_game(data)