- Qt 5.3
- Qt Quick
- Qt Quick Demo - Tweet Search
- TweetsModel.qml Example File
- Qt 5.3.2 Reference Documentation

# TweetsModel.qml Example File

demos/tweetsearch/content/TweetsModel.qml

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
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    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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    import QtQuick 2.0
    import "tweetsearch.js" as Helper

    Item {
        id: wrapper

        // Insert valid consumer key and secret tokens below
        // See https://dev.twitter.com/apps
        property string consumerKey : ""
        property string consumerSecret : ""
        property string bearerToken : ""

        property variant model: tweets
        property string from : ""
        property string phrase : ""

        property int status: XMLHttpRequest.UNSENT
        property bool isLoading: status === XMLHttpRequest.LOADING
        property bool wasLoading: false
        signal isLoaded

        ListModel { id: tweets }

        function encodePhrase(x) { return encodeURIComponent(x); }

        function reload() {
            tweets.clear()

            if (from == "" && phrase == "")
                return;

            var req = new XMLHttpRequest;
            req.open("GET", "https://api.twitter.com/1.1/search/tweets.json?from=" + from +
                            "&count=10&q=" + encodePhrase(phrase));
            req.setRequestHeader("Authorization", "Bearer " + bearerToken);
            req.onreadystatechange = function() {
                status = req.readyState;
                if (status === XMLHttpRequest.DONE) {
                    var objectArray = JSON.parse(req.responseText);
                    if (objectArray.errors !== undefined)
                        console.log("Error fetching tweets: " + objectArray.errors[0].message)
                    else {
                        for (var key in objectArray.statuses) {
                            var jsonObject = objectArray.statuses[key];
                            tweets.append(jsonObject);
                        }
                    }
                    if (wasLoading == true)
                        wrapper.isLoaded()
                }
                wasLoading = (status === XMLHttpRequest.LOADING);
            }
            req.send();
        }

        onPhraseChanged: reload();
        onFromChanged: reload();

        Component.onCompleted: {
            if (consumerKey === "" || consumerSecret == "") {
                bearerToken = encodeURIComponent(Helper.demoToken())
                return;
            }

            var authReq = new XMLHttpRequest;
            authReq.open("POST", "https://api.twitter.com/oauth2/token");
            authReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
            authReq.setRequestHeader("Authorization", "Basic " + Qt.btoa(consumerKey + ":" + consumerSecret));
            authReq.onreadystatechange = function() {
                if (authReq.readyState === XMLHttpRequest.DONE) {
                    var jsonResponse = JSON.parse(authReq.responseText);
                    if (jsonResponse.errors !== undefined)
                        console.log("Authentication error: " + jsonResponse.errors[0].message)
                    else
                        bearerToken = jsonResponse.access_token;
                }
            }
            authReq.send("grant_type=client_credentials");
        }

    }