81 lines
2.1 KiB
Python
81 lines
2.1 KiB
Python
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#!/usr/bin/env python
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'''
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KViewer
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=======
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KViewer, for KV-Viewer, is a simple tool allowing you to dynamically display
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a KV file, taking its changes into account (thanks to watchdog). The
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idea is to facilitate design using the KV language. It's somewhat related to
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the KivyCatalog demo, except it uses an on-disc file, allowing the user to use
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any editor.
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You can use the script as follows::
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python kviewer.py ./test.kv
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This will display the test.kv and automatically update the display when the
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file changes.
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.. note: This scripts uses watchdog to listen for file changes. To install
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watchdog::
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pip install watchdog
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'''
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from sys import argv
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from kivy.lang import Builder
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from kivy.app import App
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from kivy.core.window import Window
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from kivy.clock import Clock, mainthread
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from kivy.uix.label import Label
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from watchdog.observers import Observer
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from watchdog.events import FileSystemEventHandler
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from os.path import dirname, basename, join
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if len(argv) != 2:
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print('usage: %s filename.kv' % argv[0])
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exit(1)
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PATH = dirname(argv[1])
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TARGET = basename(argv[1])
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class KvHandler(FileSystemEventHandler):
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def __init__(self, callback, target, **kwargs):
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super(KvHandler, self).__init__(**kwargs)
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self.callback = callback
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self.target = target
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def on_any_event(self, event):
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if basename(event.src_path) == self.target:
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self.callback()
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class KvViewerApp(App):
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def build(self):
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o = Observer()
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o.schedule(KvHandler(self.update, TARGET), PATH)
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o.start()
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Clock.schedule_once(self.update, 1)
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return super(KvViewerApp, self).build()
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@mainthread
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def update(self, *args):
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Builder.unload_file(join(PATH, TARGET))
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for w in Window.children[:]:
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Window.remove_widget(w)
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try:
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Window.add_widget(Builder.load_file(join(PATH, TARGET)))
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except Exception as e:
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Window.add_widget(Label(text=(
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e.message if getattr(e, r'message', None) else str(e)
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)))
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if __name__ == '__main__':
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KvViewerApp().run()
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