iot-sensortag: Add logging window

This is most useful in the embedded use-case. Usually there is
no debug connection and initialization of a bluetooth connection
can take very long.

Change-Id: If5b6e8a6e684d2340d6a52b8b21bec25630d6874
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

3 files changed, 42 insertions, 0 deletions

diff --git a/tradeshow/iot-sensortag/main.cpp b/tradeshow/iot-sensortag/main.cpp
index 5dd9a7e..ba5324b 100644
--- a/tradeshow/iot-sensortag/main.cpp
+++ b/tradeshow/iot-sensortag/main.cpp
@@ -78,8 +78,22 @@
 Q_DECLARE_LOGGING_CATEGORY(boot2QtDemos)
 Q_LOGGING_CATEGORY(boot2QtDemos, "boot2qt.demos.iot")
 
+QString loggingOutput;
+QQuickWindow *loggingItem{nullptr};
+void handleMessageOutput(QtMsgType, const QMessageLogContext &, const QString &text)
+{
+    loggingOutput.prepend("\n");
+    loggingOutput.prepend(text);
+
+    loggingOutput.chop(loggingOutput.size() - 1024);
+    if (loggingItem)
+        loggingItem->setProperty("loggingOutput", loggingOutput);
+}
+
 int main(int argc, char *argv[])
 {
+    auto oldHandler = qInstallMessageHandler(handleMessageOutput);
+
     // QtChars mandate using QApplication as it uses the graphics view fw
     QApplication app(argc, argv);
 
@@ -184,9 +198,12 @@ int main(int argc, char *argv[])
         item->setProperty("contentFile", mainFile);
         item->setProperty("seriesStorage", QVariant::fromValue(&seriesStorage));
         item->setProperty("addresses", addressString);
+        loggingItem = item;
     }
     int returnValue = app.exec();
     remoteProviderPool->stopScanning();
 
+    qInstallMessageHandler(oldHandler);
+
     return returnValue;
 }
diff --git a/tradeshow/iot-sensortag/resources/base/TopToolbar.qml b/tradeshow/iot-sensortag/resources/base/TopToolbar.qml
index 6e5d9d2..69722b7 100644
--- a/tradeshow/iot-sensortag/resources/base/TopToolbar.qml
+++ b/tradeshow/iot-sensortag/resources/base/TopToolbar.qml
@@ -67,6 +67,26 @@ Item {
         visible: true
     }
 
+    Image {
+        id: logWindow
+        source: "images/bg_blue.jpg"
+        x: sensorItem.x
+        y: topToolbar.height
+        width: Math.min(mainWindow.width, 600)
+        height: Math.min(mainWindow.height - topToolbar.height, 400)
+        anchors.horizontalCenter: parent.horizontalCenter
+        visible: false
+        Text {
+            clip: true
+            color: "white"
+            font.pixelSize: 26
+            text: mainWindow.loggingOutput ? mainWindow.loggingOutput : "...debug..."
+            anchors.fill: parent
+            anchors.margins: 15
+        }
+    }
+
+
     Item {
         id: sensorItem
         height: topToolbar.height
@@ -134,6 +154,10 @@ Item {
         font.pixelSize: Style.topToolbarLargeFontSize
         anchors.horizontalCenter: parent.horizontalCenter
         anchors.bottom: parent.bottom
+        MouseArea {
+            anchors.fill: parent
+            onClicked: clickBait.activate(logWindow)
+        }
     }
 
     Timer {
diff --git a/tradeshow/iot-sensortag/resources/base/main.qml b/tradeshow/iot-sensortag/resources/base/main.qml
index caa8617..c756c6d 100644
--- a/tradeshow/iot-sensortag/resources/base/main.qml
+++ b/tradeshow/iot-sensortag/resources/base/main.qml
@@ -63,6 +63,7 @@ Window {
     property real globalBlinkOpacity: 1.0
     property string addresses : ""
     property bool localSelected : true
+    property var loggingOutput : null
 
     function getCurrentPool() {
         if (localSelected)