Improve GeoJson Viewer example

Switches to Qt.labs.platform FileDialog and sets the proper initial
directory, as well as handles command line argument

Change-Id: I2ae4fc3244d1e2566556d3966aedf273ac98e3d1
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

examples/location/geojson_viewer/GeoJsonDelegate.qml

 /****************************************************************************
 **
-** Copyright (C) 2018 The Qt Company Ltd.
+** Copyright (C) 2019 Julian Sherollari <jdotsh@gmail.com>
+** Copyright (C) 2019 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -57,7 +58,7 @@ DelegateChooser {
     id: dc
     role: "type"
     property color defaultColor: "grey"
-    property real defaultOpacity: 0.4
+    property real defaultOpacity: 0.7
 
     DelegateChoice {
         roleValue: "Point"
@@ -65,11 +66,14 @@ DelegateChooser {
             property string geojsonType: "Point"
             property var props: modelData.properties
             geoShape: modelData.data
-            radius: 100*100
+            radius: 20*1000
             border.width: 3
             opacity: dc.defaultOpacity
-            color: ((props !== undefined && props["color"] !== undefined) ? props["color"] :
-                   ((parent.props !== undefined && parent.props["color"] !== undefined) ? parent.props["color"]: dc.defaultColor))
+            /* The expression below is equivalent to:
+               ((props !== undefined && props["color"] !== undefined) ? props["color"] :
+               ((parent && parent.props !== undefined && parent.props["color"] !== undefined) ? parent.props["color"] : dc.defaultColor))
+            */
+            color: (props && props.color) || (parent && parent.props && parent.props.color) || dc.defaultColor
         }
     }
 
@@ -79,10 +83,9 @@ DelegateChooser {
             property string geojsonType: "LineString"
             property var props: modelData.properties
             geoShape: modelData.data
-            line.width: 1
+            line.width: 3
             opacity: dc.defaultOpacity
-            line.color: ((props !== undefined && props["color"] !== undefined) ? props["color"] :
-                        ((parent.props !== undefined && parent.props["color"] !== undefined) ? parent.props["color"]: dc.defaultColor))
+            line.color: (props && props.color) || (parent && parent.props && parent.props.color) || dc.defaultColor
         }
     }
 
@@ -93,8 +96,8 @@ DelegateChooser {
             property var props: modelData.properties
             geoShape: modelData.data
             opacity: dc.defaultOpacity
-            color: ((props !== undefined && props["color"] !== undefined) ? props["color"] :
-                   ((parent.props !== undefined && parent.props["color"] !== undefined) ? parent.props["color"]: dc.defaultColor))
+            color: (props && props.color) || (parent && parent.props && parent.props.color) || dc.defaultColor
+            border.width: 0
         }
     }
 

examples/location/geojson_viewer/data/09-featurecollection.json

 {
     "type" : "FeatureCollection",
+    "properties" : {
+        "color" : "crimson"
+    },
     "features" : [
         {
             "type" : "Feature",
@@ -30,7 +33,8 @@
            "type" : "Feature",
            "id" : "MultiLine",
            "properties" : {
-               "text" : "This is a Feature with a MultiLineString"
+               "text" : "This is a Feature with a MultiLineString",
+               "color" : "deepskyblue"
            },
            "geometry" : {
               "type" : "MultiLineString",

examples/location/geojson_viewer/geojson_viewer.pro

 TARGET = qml_location_geojsonviewer
 TEMPLATE = app
 
-QT += qml network quick positioning location-private
+QT += core qml network quick positioning location-private widgets
 SOURCES += main.cpp
 CONFIG += c++11
 CONFIG += install_ok
@@ -17,3 +17,4 @@ OTHER_FILES += \
 
 target.path = $$[QT_INSTALL_EXAMPLES]/location/geojsonviewer
 INSTALLS += target
+DEFINES += $$shell_quote(SRC_PATH=$$PWD)

examples/location/geojson_viewer/main.cpp

 /****************************************************************************
 **
-** Copyright (C) 2017 The Qt Company Ltd.
-** Copyright (C) 2018 Julian Sherollari <jdotsh@gmail.com>
+** Copyright (C) 2019 Julian Sherollari <jdotsh@gmail.com>
+** Copyright (C) 2019 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -49,7 +49,7 @@
 **
 ****************************************************************************/
 
-#include <QGuiApplication>
+#include <QApplication>
 #include <QQmlApplicationEngine>
 #include <QDebug>
 #include <QFile>
@@ -68,6 +68,8 @@
 #include <QtLocation/private/qdeclarativerectanglemapitem_p.h>
 #include <QJsonObject>
 #include <QJsonArray>
+#include <QFileInfo>
+#include <QtCore/qobjectdefs.h>
 
 class extractor
 {
@@ -193,7 +195,6 @@ public slots:
 
         // Import geographic data to a QVariantList
         QVariantList modelList = QGeoJson::importGeoJson(loadDoc);
-        qDebug() << "Testing instant export for bbox and id members: " << QGeoJson::exportGeoJson(modelList);
         m_importedGeoJson =  modelList;
         emit modelChanged();
         return true;
@@ -249,15 +250,24 @@ public:
 int main(int argc, char *argv[])
 {
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-    QGuiApplication app(argc, argv);
+    QApplication app(argc, argv);
 
-    // Switch to QML app
     QQmlApplicationEngine engine;
+    QUrl absoluteFilePath = argc > 1 ?
+                    QUrl(QStringLiteral("file://") + QFileInfo(argv[1]).absoluteFilePath()) :
+                    QUrl();
+    engine.rootContext()->setContextProperty("dataPath", QUrl(QStringLiteral("file://")
+                                                              + qPrintable(QT_STRINGIFY(SRC_PATH))
+                                                              + QStringLiteral("/data")));
     qmlRegisterType<GeoJsoner>("Qt.GeoJson", 1, 0, "GeoJsoner");
     engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
 
     if (engine.rootObjects().isEmpty())
         return -1;
+    if (!absoluteFilePath.isEmpty()) {
+        GeoJsoner *geoJsoner = engine.rootObjects().first()->findChild<GeoJsoner*>();
+        QMetaObject::invokeMethod(geoJsoner, "load", Qt::QueuedConnection, Q_ARG(QUrl, absoluteFilePath));
+    }
 
     return app.exec();
 }

examples/location/geojson_viewer/main.qml

 /****************************************************************************
 **
-** Copyright (C) 2017 The Qt Company Ltd.
-** Copyright (C) 2018 Julian Sherollari <jdotsh@gmail.com>
+** Copyright (C) 2019 Julian Sherollari <jdotsh@gmail.com>
+** Copyright (C) 2019 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -50,9 +50,9 @@
 ****************************************************************************/
 
 import QtQuick 2.11
-import QtQuick.Controls 1.4
+import QtQuick.Controls 1.4 as C1
 import QtQuick.Controls.Styles 1.4
-import QtQuick.Dialogs 1.3
+import Qt.labs.platform 1.1
 import QtQuick.Layouts 1.11
 import QtQuick.Window 2.11
 import QtPositioning 5.12
@@ -60,7 +60,7 @@ import QtLocation 5.12
 import Qt.labs.qmlmodels 1.0
 import Qt.GeoJson 1.0
 
-ApplicationWindow {
+C1.ApplicationWindow {
     visible: true
     width: 1024
     height: 1024
@@ -70,71 +70,73 @@ ApplicationWindow {
     FileDialog {
         visible: false
         id: fileDialog
-        title: "Please choose a GeoJSON file"
-        folder: shortcuts.home
+        title: "Choose a GeoJSON file"
+        fileMode: FileDialog.OpenFile
+        folder: dataPath
         onAccepted: {
-            geoJsoner.load(fileDialog.fileUrl)
+            geoJsoner.load(fileDialog.file)
         }
     }
 
     FileDialog {
-        selectExisting : false
         visible: false
         id: fileWriteDialog
         title: "Write your geometry to a file"
-        folder: shortcuts.home
+        fileMode: FileDialog.SaveFile
+        folder: StandardPaths.writableLocation(StandardPaths.TempLocation)
         onAccepted: {
-            geoJsoner.dumpGeoJSON(geoJsoner.toGeoJson(miv), fileWriteDialog.fileUrl);
+            geoJsoner.dumpGeoJSON(geoJsoner.toGeoJson(miv), fileWriteDialog.file);
         }
     }
 
     FileDialog {
-        selectExisting : false
         visible: false
         id: debugWriteDialog
         title: "Write Qvariant debug view"
-        folder: shortcuts.home
+        fileMode: FileDialog.SaveFile
+        folder: StandardPaths.writableLocation(StandardPaths.TempLocation)
         onAccepted: {
-            geoJsoner.writeDebug(geoJsoner.toGeoJson(miv), debugWriteDialog.fileUrl);
+            geoJsoner.writeDebug(geoJsoner.toGeoJson(miv), debugWriteDialog.file);
         }
     }
 
-    MenuBar {
+    C1.MenuBar {
         id: mainMenu
 
-        Menu {
-            title: "GeoJSON"
+        C1.Menu {
+            title: "&File"
             id : geoJsonMenu
-            MenuItem {
-                text: "Import"
-                shortcut: "Ctrl+I"
-                id : geoJsonMenuOpen
+            C1.MenuItem {
+                text: "&Open"
+                shortcut: StandardKey.Open
                 onTriggered: {
                     fileDialog.open()
                 }
             }
-            MenuItem {
-                text: "Export"
-                shortcut: "Ctrl+E"
-                id : geoJsonWrite
-                 onTriggered: {
+            C1.MenuItem {
+                text: "&Export"
+                shortcut: StandardKey.Save
+                onTriggered: {
                     fileWriteDialog.open()
                 }
             }
+            C1.MenuItem {
+                text: "E&xit"
+                shortcut: StandardKey.Quit
+                onTriggered: Qt.quit()
+            }
         }
-        Menu {
-            title: "Debug"
+        C1.Menu {
+            title: "&Debug"
             id : debugMenu
-            MenuItem {
-                text: "Print debug data to file"
-                shortcut: "Ctrl+D"
-                id : debugMenuWrite
+            C1.MenuItem {
+                text: "Print debug data to &file"
                 onTriggered: {
                     debugWriteDialog.open()
                 }
             }
-            MenuItem {
-                text: "Print debug data"
+            C1.MenuItem {
+                text: "&Print debug data"
                 onTriggered: {
                     geoJsoner.print(miv)
                 }