[Sensor example] Check for the required sensor types on starup

If the requited sensor dependencies are not met, output an
informative message.

Change-Id: I1ed73729a100cf9e91a2c8a3aded2a13c09b0bb1
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@digia.com>

1 files changed, 52 insertions, 15 deletions

diff --git a/basicsuite/Sensors/main.qml b/basicsuite/Sensors/main.qml
index 2e1b820..90d1dcd 100644
--- a/basicsuite/Sensors/main.qml
+++ b/basicsuite/Sensors/main.qml
@@ -1,28 +1,65 @@
 import QtQuick 2.0
 import QtSensors 5.0
+import QtSensors 5.0 as Sensors
 
 Item {
     id: root
     width: 800
     height: 1280
-    Rectangle {
-        id: main
-        width: root.height
-        height: root.width
-        anchors.centerIn: parent
-        rotation: 90
-        border.width: 1
 
-        Light {
-            id: lys
-            width: main.width
-            height: main.height / 2
+    Component {
+        id: sensorExample
+        Rectangle {
+            id: main
+            width: root.height
+            height: root.width
+            rotation: 90
+            border.width: 1
+            Light {
+                id: lys
+                width: main.width
+                height: main.height / 2
+            }
+
+            Accelbubble {
+                width: main.width
+                height: main.height / 2
+                anchors.top: lys.bottom
+            }
+        }
+    }
+
+    Component {
+        id: message
+        Rectangle {
+            width: root.width
+            height: root.height
+            Text {
+                font.pixelSize: 22
+                anchors.centerIn: parent
+                text: "It appears that this device doesn't provide the required sensors!"
+            }
         }
+    }
 
-        Accelbubble {
-            width: main.width
-            height: main.height / 2
-            anchors.top: lys.bottom
+    Loader {
+        id: pageLoader
+        anchors.centerIn: parent
+    }
+
+    Component.onCompleted: {
+        var typesList = Sensors.QmlSensors.sensorTypes();
+        var count = 0
+        for (var i = 0; i < typesList.length; ++i) {
+            if (typesList[i] == "QAccelerometer")
+                count++
+            if (typesList[i] == "QLightSensor")
+                count++
         }
+
+        if (count > 1)
+            pageLoader.sourceComponent = sensorExample
+        else
+            pageLoader.sourceComponent = message
     }
 }