bugfix

kivyblocks/__init__.py

@@ -1,6 +1,7 @@
 import os
 # from kivy.logger import logging
 __version_info__ = "0.5.0"
+from .defaultimage import DefaultImage
 from .version import __version__
 
 path = os.path.dirname(__file__)

kivyblocks/defaultimage.py

@@ -0,0 +1,38 @@
+from kivy.uix.image import AsyncImage
+from kivy.factory import Factory
+from kivy.properties import StringProperty
+from urllib.request import urlopen
+from kivyblocks.utils import blockImage
+
+class DefaultImage(AsyncImage):
+	default_source = StringProperty(None)
+	def __init__(self, default_source=None, **kw):
+		self.default_source = default_source
+		super().__init__(**kw)
+		if self.default_source is None:
+			self.default_source = blockImage('broken.png')
+
+	def can_access(self, src):
+		if os.path.isfile(src):
+			return True
+		if self.is_uri(src):
+			with urlopen(src, timeout=0.5):
+				return True
+		return None
+
+	def on_source(self, o, s):
+		if not self.can_access(s):
+			self.source = self.default_source
+
+Factory.register('DefaultImage', DefaultImage)
+
+if __name__ == '__main__':
+	import os
+	import sys
+	from kivy.app import App
+	class TestApp(App):
+		def build(self):
+			return DefaultImage(source=sys.argv[1], default_source='/Volumes/home/ymq/pydev/github/kivyblocks/kivyblocks/imgs/doing.gif')
+	
+	app = TestApp()
+	app.run()

kivyblocks/version.py

@@ -1 +1,3 @@
-__version__ = '0.2.8'
+# add a new class DefaultImage, if the source load failed, source set to default_source
+__version__ = '0.2.9'
+# __version__ = '0.2.8'