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>

11 files changed, 186 insertions, 85 deletions

diff --git a/examples/quick/particles/itemparticle/itemparticle.pro b/examples/quick/particles/itemparticle/itemparticle.pro
new file mode 100644
index 0000000000..f5c0576b4a
--- /dev/null
+++ b/examples/quick/particles/itemparticle/itemparticle.pro
@@ -0,0 +1,12 @@
+TEMPLATE = app
+
+QT += quick qml
+SOURCES += main.cpp
+RESOURCES += \
+    ../images.qrc \
+    ../../shared/shared.qrc \
+    $$files("content/*") \
+    $$files("*qml")
+
+target.path = $$[QT_INSTALL_EXAMPLES]/quick/particles/itemparticle
+INSTALLS += target
diff --git a/examples/quick/particles/itemparticle/content/RssModel.qml b/examples/quick/particles/itemparticle/main.cpp
index d839087301..da21f15be3 100644
--- a/examples/quick/particles/itemparticle/content/RssModel.qml
+++ b/examples/quick/particles/itemparticle/main.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2017 The Qt Company Ltd.
+** Copyright (C) 2018 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -47,20 +47,5 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
-
-import QtQuick 2.0
-import QtQuick.XmlListModel 2.0
-
-XmlListModel {
-    property string tags : ""
-
-    function encodeTags(x) { return encodeURIComponent(x.replace(' ',',')); }
-
-    source: "http://api.flickr.com/services/feeds/photos_public.gne?"+(tags ? "tags="+encodeTags(tags)+"&" : "")
-    query: "/feed/entry"
-    namespaceDeclarations: "declare default element namespace 'http://www.w3.org/2005/Atom';"
-
-    XmlRole { name: "title"; query: "title/string()" }
-    XmlRole { name: "content"; query: "content/string()" }
-    XmlRole { name: "hq"; query: "link[@rel='enclosure']/@href/string()" }
-}
+#include "../../shared/shared.h"
+DECLARATIVE_EXAMPLE_MAIN(particleview)
diff --git a/examples/quick/particles/itemparticle/particleview.qml b/examples/quick/particles/itemparticle/particleview.qml
index 8d7b1eb66b..3b412e37e5 100644
--- a/examples/quick/particles/itemparticle/particleview.qml
+++ b/examples/quick/particles/itemparticle/particleview.qml
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2017 The Qt Company Ltd.
+** Copyright (C) 2018 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -48,8 +48,9 @@
 **
 ****************************************************************************/
 
-import QtQuick 2.0
-import QtQuick.Particles 2.0
+import QtQuick 2.12
+import QtQuick.Particles 2.12
+import "shared" as Shared
 import "content/script.js" as Script
 import "content"
 
@@ -96,7 +97,7 @@ Item {
     ImageParticle {
         system: sys
         groups: ["fireworks"]
-        source: "qrc:particleresources/star.png"
+        source: "qrc:///particleresources/star.png"
         color: "lightsteelblue"
         alpha: 0
         colorVariation: 0
@@ -112,8 +113,13 @@ Item {
     Component {
         id: alertDelegate
         Rectangle {
-            width: 132
+            color: "DarkSlateGray"
+            border.width: 1
+            border.color: "LightSteelBlue"
+            width: 144
             height: 132
+            antialiasing: true
+            radius: 3
             NumberAnimation on scale {
                 running: true
                 loops: 1
@@ -121,13 +127,14 @@ Item {
                 to: 1
             }
             Image {
-                source: "../asteroid/../images/rocket.png"
+                source: "qrc:///particles/images/rocket.png"
                 anchors.centerIn: parent
             }
             Text {
                 anchors.bottom: parent.bottom
                 anchors.horizontalCenter: parent.horizontalCenter
                 text: "A new ship has arrived!"
+                color: "LightSteelBlue"
             }
         }
     }
@@ -198,84 +205,97 @@ Item {
     }
     Item { x: -1000; y: -1000 //offscreen
         Repeater {//Load them here, add to system on completed
-            model: theModel
+            model: flickrModel
             delegate: theDelegate
         }
     }
-    RssModel {id: theModel; tags:"particle,particles"}
+    Shared.FlickrRssModel {
+        id: flickrModel
+        tags: "particle,particles"
+    }
     Component {
         id: theDelegate
-        Rectangle {
-            id: container
-            border.width: 2
-            antialiasing: true
-            property real myRand: Math.random();//'depth'
-            z: Math.floor(myRand * 100)
-            scale: (myRand + 1.0)/2;
-            //TODO: Darken based on 'depth'
+        Image {
+            id: image
+            antialiasing: true;
+            source: thumbnail
+            cache: true
+            property real depth: Math.random()
+            property real darken: 0.75
+            z: Math.floor(depth * 100)
+            scale: (depth + 1) / 2
+            sourceSize {
+                width: root.width
+                height: root.height
+            }
             width: 132
             height: 132
-            //ItemParticle.onAttached: console.log("I'm in"  + x + "," + y + ":" + opacity);
-            ItemParticle.onDetached: mp.take(container);//respawns
-            function manage()
-            {
-                if (state == "selected") {
-                    console.log("Taking " + index);
-                    mp.freeze(container);
-                } else {
-                    console.log("Returning " +index);
-                    mp.unfreeze(container);
-                }
-            }
-            Image {
-                id: img
+            fillMode: Image.PreserveAspectFit
+            Rectangle {
+                // Darken based on depth
                 anchors.centerIn: parent
+                width: parent.paintedWidth + 1
+                height: parent.paintedHeight + 1
+                color: "black"
+                opacity: darken * (1 - depth)
                 antialiasing: true;
-                source: "http://" + Script.getImagePath(content); cache: true
-                fillMode: Image.PreserveAspectFit;
-                width: parent.width-4; height: parent.height-4
-                onStatusChanged: if (img.status == Image.Ready) {
-                    loading.opacity = 0;
-                    mp.take(container);
-                }
             }
             Text {
                 anchors.bottom: parent.bottom
-                width: parent.width
+                anchors.horizontalCenter: parent.horizontalCenter
+                anchors.bottomMargin: Math.max(parent.paintedWidth, parent.paintedHeight) - Math.min(parent.width, parent.height)
+                width: parent.paintedWidth - 4
                 horizontalAlignment: Text.AlignHCenter
                 elide: Text.ElideRight
                 text: title
                 color: "black"
             }
-            MouseArea {
-                anchors.fill: parent
-                onClicked: container.state == "selected" ? container.state = "" : container.state = "selected"
+            ItemParticle.onDetached: mp.take(image); // respawns
+            onStatusChanged: if (image.status == Image.Ready) {
+                loading.opacity = 0;
+                mp.take(image);
+            }
+            function manage()
+            {
+                if (state == "selected") {
+                    console.log("Taking " + index);
+                    mp.freeze(image);
+                } else {
+                    console.log("Returning " +index);
+                    mp.unfreeze(image);
+                }
+            }
+            TapHandler {
+                gesturePolicy: TapHandler.ReleaseWithinBounds
+                onTapped: image.state = (image.state == "" ? "selected" : "")
             }
             states: State {
                 name: "selected"
                 ParentChange {
-                    target: container
+                    target: image
                     parent: root
-                    x: 0
-                    y: 0
                 }
                 PropertyChanges {
-                    target: container
+                    target: image
+                    source: media
+                    x: 0
+                    y: 0
                     width: root.width
                     height: root.height
                     z: 101
                     opacity: 1
                     rotation: 0
+                    darken: 0
                 }
             }
             transitions: Transition {
                 to: "selected"
                 reversible: true
                 SequentialAnimation {
-                    ScriptAction {script: container.manage();}
+                    ScriptAction { script: image.manage() }
                     ParallelAnimation {
-                        ParentAnimation {NumberAnimation { properties: "x,y" }}//Doesn't work, particles takes control of x,y instantly
-                        NumberAnimation { properties: "width, height, z, rotation" }
+                        ParentAnimation {NumberAnimation { properties: "x,y" }}
+                        PropertyAnimation { properties: "width, height, z, rotation, darken"; easing.type: Easing.InOutQuad }
                     }
                 }
             }
diff --git a/examples/quick/particles/particles.pro b/examples/quick/particles/particles.pro
index 2ea61751fb..db9033a961 100644
--- a/examples/quick/particles/particles.pro
+++ b/examples/quick/particles/particles.pro
@@ -3,11 +3,11 @@ SUBDIRS += affectors \
     customparticle \
     emitters \
     imageparticle \
+    itemparticle \
     system
 
 EXAMPLE_FILES = \
-    images.qrc \
-    itemparticle
+    images.qrc
 
 #Install shared images too
 qml.files = images
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");
+    }
+}
+
diff --git a/examples/quick/shared/shared.qrc b/examples/quick/shared/shared.qrc
index 89b3ff757e..cce683f8a3 100644
--- a/examples/quick/shared/shared.qrc
+++ b/examples/quick/shared/shared.qrc
@@ -1,5 +1,6 @@
 <RCC>
     <qresource prefix="/shared">
+        <file>FlickrRssModel.qml</file>
         <file>LauncherList.qml</file>
         <file>SimpleLauncherDelegate.qml</file>
         <file>Button.qml</file>
diff --git a/examples/quick/views/visualdatamodel/visualdatamodel.qmlproject b/examples/quick/views/delegatemodel/delegatemodel.qmlproject
index 2bb4016996..2bb4016996 100644
--- a/examples/quick/views/visualdatamodel/visualdatamodel.qmlproject
+++ b/examples/quick/views/delegatemodel/delegatemodel.qmlproject
diff --git a/examples/quick/views/visualdatamodel/dragselection.qml b/examples/quick/views/delegatemodel/dragselection.qml
index 15fd2654c2..15fd2654c2 100644
--- a/examples/quick/views/visualdatamodel/dragselection.qml
+++ b/examples/quick/views/delegatemodel/dragselection.qml
diff --git a/examples/quick/views/visualdatamodel/slideshow.qml b/examples/quick/views/delegatemodel/slideshow.qml
index 369b5a46ac..b252519bbf 100644
--- a/examples/quick/views/visualdatamodel/slideshow.qml
+++ b/examples/quick/views/delegatemodel/slideshow.qml
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2017 The Qt Company Ltd.
+** Copyright (C) 2018 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -48,9 +48,9 @@
 **
 ****************************************************************************/
 
-import QtQuick 2.0
-import QtQuick.XmlListModel 2.0
-import QtQml.Models 2.1
+import QtQuick 2.12
+import QtQml.Models 2.12
+import "../../shared" as Shared
 
 Rectangle {
     id: root
@@ -61,18 +61,14 @@ Rectangle {
 
     color: "black"
 
+    Shared.FlickrRssModel {
+        id: flickrModel
+        tags: "fjords,mountains"
+    }
     DelegateModel {
         id: visualModel
 
-        model: XmlListModel {
-            source: "http://api.flickr.com/services/feeds/photos_public.gne?format=rss2"
-            query: "/rss/channel/item"
-            namespaceDeclarations: "declare namespace media=\"http://search.yahoo.com/mrss/\";"
-
-            XmlRole { name: "imagePath"; query: "media:thumbnail/@url/string()" }
-            XmlRole { name: "url"; query: "media:content/@url/string()" }
-        }
-
+        model: flickrModel
         delegate: Item {
             id: delegateItem
 
@@ -90,9 +86,8 @@ Rectangle {
                     anchors.leftMargin: 1
                     anchors.topMargin: 1
 
-                    source: imagePath
+                    source: thumbnail
                     fillMode: Image.PreserveAspectFit
-
                 }
 
                 MouseArea {
diff --git a/examples/quick/views/views.qml b/examples/quick/views/views.qml
index 87f85856ff..bdf05269ae 100644
--- a/examples/quick/views/views.qml
+++ b/examples/quick/views/views.qml
@@ -69,6 +69,8 @@ Item {
             addExample("PathView", "A simple PathView", Qt.resolvedUrl("pathview/pathview-example.qml"))
             addExample("ObjectModel", "Using a ObjectModel", Qt.resolvedUrl("objectmodel/objectmodel.qml"))
             addExample("Display Margins", "A ListView with display margins", Qt.resolvedUrl("listview/displaymargin.qml"))
+            addExample("DelegateModel", "A PathView using DelegateModel to instantiate delegates", Qt.resolvedUrl("delegatemodel/slideshow.qml"))
+            addExample("Draggable Selections", "Enabling drag-and-drop on DelegateModel delegates", Qt.resolvedUrl("delegatemodel/dragselection.qml"))
         }
     }
 }
diff --git a/examples/quick/views/views.qrc b/examples/quick/views/views.qrc
index 547dbea992..1646c49e81 100644
--- a/examples/quick/views/views.qrc
+++ b/examples/quick/views/views.qrc
@@ -41,8 +41,8 @@
         <file>pathview/pics/EMail_48.png</file>
         <file>pathview/pics/TodoList_48.png</file>
         <file>pathview/pics/VideoPlayer_48.png</file>
-        <file>visualdatamodel/slideshow.qml</file>
-        <file>visualdatamodel/dragselection.qml</file>
+        <file>delegatemodel/slideshow.qml</file>
+        <file>delegatemodel/dragselection.qml</file>
         <file>objectmodel/objectmodel.qml</file>
         <file>views.qml</file>
         <file>listview/displaymargin.qml</file>