Mist/assets/ext/pre.js


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// Helper function for generating pseudo callbacks and sending data to the QML part of the application
function postData(data, cb) {
    data._seed = Math.floor(Math.random() * 1000000)
    if(cb) {
        eth._callbacks[data._seed] = cb;
    }

    if(data.args === undefined) {
        data.args = [];
    }

    navigator.qt.postMessage(JSON.stringify(data));
}

navigator.qt.onmessage = function(ev) {
    var data = JSON.parse(ev.data)

    if(data._event !== undefined) {
        eth.trigger(data._event, data.data);
    } else {
        if(data._seed) {
            var cb = eth._callbacks[data._seed];
            if(cb) {
                // Figure out whether the returned data was an array
                // array means multiple return arguments (multiple params)
                if(data.data instanceof Array) {
                    cb.apply(this, data.data)
                } else {
                    cb.call(this, data.data)
                }

                // Remove the "trigger" callback
                delete eth._callbacks[ev._seed];
            }
        }
    }
}