A lightweight envrionment-agnostic SDK for constructing graphical user interfaces.
A typical Lens app is composed of two phases, there's the backend which is written in python and the frontend which is composed of HTML5/CSS3/JS similar to web development.
A bridge exists between the Python and WebKit components that can be traversed through signal/slot calls. For example Python slots can be reached via WebKit signals and conversely Webkit slots can be reached via Python signals.
A simple app is shown below.
from lens.app import App
app = App()
# load the app entry page
app.namespaces.append('./app-data')
app.load_ui('app.html')
@app.connect('close')
def _close_app_cb(*args):
app.close()
@app.connect('get-hostname')
def _get_hostname_cb(*args):
app.emit('update-config', os.uname()[1])
app.start()<!DOCTYPE html>
<html lang="en">
<head>
<link href="lens://css/lens.css" rel="stylesheet">
<link href="app://css/app.css" rel="stylesheet">
</head>
<body>
<h1>Lens. Demo</h1>
<p>This sample demonstrates most of the widgets supported by Lens. Leveraging the Bootstrap and the Angular UI projects, the scope for Lens widgets are limited only by your abilities in HTML5, CSS3 and JS.</p>
<p>Hostname: <span id="hostname"></span></p>
<button id="close">CLOSE</button>
<script src="lens://js/lens-angular.min.js"></script>
<script src="app://js/app.js"></script>
<script>
</script>
</body>
</html>During the development process it's possible to expose internal Lens debugging
by using the LENS_DEBUG environment variable. Setting the variable to 1 will
enable verbose Lens debugging messages.
LENS_DEBUG=1 ./app
On the WebKit side it's possible to get full Inspector ability by using the
LENS_INSPECTOR environment variable. Setting the variable to 1 will enable
right-click and opening of the Inspector.
LENS_INSPECTOR=1 ./app