Hi All,
I finally got around to working on ways for the Java embedding/host application
to inject JavaScript into the GeckoView context [1]. Coupled with injecting
scripts is a mechanism to communicate between the JavaScript in GeckoView and
the Java in the host application.
I have a working prototype that looks like this:
class GeckoView {
...
importScript(String url);
}
interface GeckoViewChrome {
...
onScriptMessage(GeckoView view, JSONObject data, GeckoView.MessageResult
result);
}
The importScript method takes a resource://android/assets/ URL to a JavaScript
file bundled with the host application. Only scripts in the bundled assets
folder will be imported. The scripts are imported in almost exactly the same
way restartless add-on bootstrap.js files are loaded in Firefox. If the script
has a global "load" function, it is called after the import happens. The "load"
function is passed a "params" object which has some properties, one of which is
"window" - the main Gecko window used to host the browsers.
So a script might look like this:
function load(params) {
console.log("Got loaded!");
params.window.BrowserApp.deck.addEventListener("load", function(event) {
console.log("Loaded a web page in a tab!");
}, true);
}
The scripts can send messages and data back to the Java host application using
a simple GeckoView (name and features subject to change) helper:
function load(params) {
function callback(response) { ... };
GeckoView.sendRequest({ json data }, callback);
}
The request is sent to the host and handled via the onScriptMessage method. If
the optional callback is used in the request, you can signal success (and send
back a response) or failure using the MessageResult object.
Thoughts?
Finkle
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1035420
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