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annotate src/image.py @ 14:21a432afd06d

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plugin system, first draft: - widgets are now handled with plugins, ContactList and WidgetSelector have been changed to be pluggins - everything in PLUGIN_INFO (including PLUGIN_INFO itself) is optional. Best guess is used if a value is missing - WidgetsHandler use default widget from plugins, which is WidgetSelector for now - PLUGIN_INFO is used in the same way as for backed plugins, with (for now) following possible keys: - "name": human readable name - "description": long description of what widget do - "import_name": unique short name used as reference for import - "main": main class name - "factory": callback used to instanciate a widget (see Cagou._defaultFactory) - "kv_file": path to the kv language file to load (same filename with ".kv" will be used if key is not found) other data should be added quickly, as a path to a file used as icon - host.getPluggedWidgets can be used to find loaded widgets. except_cls can be used to excluse a class (self.__class__ usually) - fixed host.switchWidget when old widget is already a CagouWidget - CagouWidget header new display the available widgets
author Goffi <goffi@goffi.org>
date Sat, 09 Jul 2016 16:02:44 +0200
parents d9095d1dd7ae
children
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # Cagou: desktop/mobile frontend for Salut à Toi XMPP client
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5 # Copyright (C) 2016 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20
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21 from sat.core import log as logging
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22 log = logging.getLogger(__name__)
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23 from kivy.uix import image as kivy_img
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24 from kivy.core.image import Image as CoreImage
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25 from kivy.resources import resource_find
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26 import io
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27 import PIL
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28
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29
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30 class Image(kivy_img.Image):
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31 """Image widget which accept source without extension"""
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32
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33 def texture_update(self, *largs):
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34 if not self.source:
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35 self.texture = None
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36 else:
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37 filename = resource_find(self.source)
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38 self._loops = 0
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39 if filename is None:
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40 return log.error('Image: Error reading file {filename}'.
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41 format(filename=self.source))
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42 mipmap = self.mipmap
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43 if self._coreimage is not None:
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44 self._coreimage.unbind(on_texture=self._on_tex_change)
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45 try:
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46 self._coreimage = ci = CoreImage(filename, mipmap=mipmap,
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47 anim_delay=self.anim_delay,
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48 keep_data=self.keep_data,
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49 nocache=self.nocache)
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50 except Exception as e:
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51 # loading failed probably because of unmanaged extention,
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52 # we try our luck with with PIL
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53 try:
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54 im = PIL.Image.open(filename)
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55 ext = im.format.lower()
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56 del im
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57 # we can't use im.tobytes as it would use the
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58 # internal decompressed representation from pillow
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59 # and im.save would need processing to handle format
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60 data = io.BytesIO(open(filename, "rb").read())
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61 cache_filename = u"{}.{}".format(filename,ext) # needed for kivy's Image to use cache
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62 self._coreimage = ci = CoreImage(data, ext=ext,
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63 filename=cache_filename, mipmap=mipmap,
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64 anim_delay=self.anim_delay,
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65 keep_data=self.keep_data,
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66 nocache=self.nocache)
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67 except Exception as e:
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68 log.warning(u"Can't load image: {}".format(e))
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69 self._coreimage = ci = None
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70
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71 if ci:
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72 ci.bind(on_texture=self._on_tex_change)
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73 self.texture = ci.texture