Examples: Use XmlHttpRequest to fetch flickr public photos

This change is to facilite moving the XmlListModel code to the
qtxmlpatterns repo, but still keep all the Particles examples
together.

Also fixed:
- the old TODO about darkening images according to depth,
and make it generally look a bit better.

- move the visualdatamodel examples to a directory called
delegatemodel, since that's how they work now.  And add them
to the main "views" example launcher so that they become more
visible to users.

Change-Id: I78f9f19e1e110608580adedcf4cd3be554222515
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 86 insertions, 0 deletions

diff --git a/examples/quick/shared/FlickrRssModel.qml b/examples/quick/shared/FlickrRssModel.qml
new file mode 100644
index 0000000000..cee4022bf0
--- /dev/null
+++ b/examples/quick/shared/FlickrRssModel.qml
@@ -0,0 +1,86 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, 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.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.12
+
+ListModel {
+    id: flickrImages
+    property string tags : ""
+    readonly property string queryUrl : "http://api.flickr.com/services/feeds/photos_public.gne?"
+
+    function encodeParams(x) {
+        return encodeURIComponent(x.replace(" ",","));
+    }
+    function fetchImages(format) {
+        var requestURL = queryUrl + (tags ? "tags="+encodeParams(tags)+"&" : "") + "format=" + format + "&nojsoncallback=1";
+        var xhr = new XMLHttpRequest;
+        xhr.onreadystatechange = function() {
+            if (xhr.readyState === XMLHttpRequest.DONE) {
+                var jsonText = xhr.responseText;
+                var objArray = JSON.parse(jsonText.replace(/\'/g,"'"))
+                if (objArray.errors !== undefined)
+                    console.log(lCategory, "Error fetching tweets: " + imageItems.errors[0].message)
+                else {
+                    for (var key in objArray.items) {
+                        var rssItem = objArray.items[key];
+                        var jsonObject = "{ \"title\": \"" + rssItem.title +"\",\"media\": \"" + rssItem.media.m + "\", \"thumbnail\": \"" + rssItem.media.m.replace(/\_m\.jpg/,"_s.jpg") +"\"}"
+                        flickrImages.append(JSON.parse(jsonObject));
+                    }
+                }
+            }
+        }
+        xhr.open("GET", requestURL, true);
+        xhr.send();
+    }
+    Component.onCompleted: {
+        fetchImages("json");
+    }
+}
+