Add file save support for logs

src/QGCApplication.cc

@@ -36,6 +36,7 @@
 #include <QPainter>
 #include <QStyleFactory>
 #include <QAction>
+#include <QStringListModel>
 
 #ifdef QGC_ENABLE_BLUETOOTH
 #include <QBluetoothLocalDevice>
@@ -485,7 +486,7 @@ bool QGCApplication::_initForNormalAppBoot(void)
     _qmlAppEngine = new QQmlApplicationEngine(this);
     _qmlAppEngine->addImportPath("qrc:/qml");
     _qmlAppEngine->rootContext()->setContextProperty("joystickManager", toolbox()->joystickManager());
-    _qmlAppEngine->rootContext()->setContextProperty("debugMessageModel", &AppMessages::getModel());
+    _qmlAppEngine->rootContext()->setContextProperty("debugMessageModel", AppMessages::getModel());
     _qmlAppEngine->load(QUrl(QStringLiteral("qrc:/qml/MainWindowNative.qml")));
 #else
     // Start the user interface

src/QmlControls/AppMessages.cc

@@ -22,11 +22,14 @@ This file is part of the QGROUNDCONTROL project
 ======================================================================*/
 
 #include "AppMessages.h"
+#include <QFile>
 #include <QStringListModel>
-#include <iostream>
+#include <QtConcurrent>
+#include <QTextStream>
 
+AppLogModel AppLogModel::instance;
 static QtMessageHandler old_handler;
-static QStringListModel debug_strings;
+static AppLogModel &debug_strings = AppLogModel::getModel();
 
 static void msgHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg)
 {
@@ -51,7 +54,33 @@ void AppMessages::installHandler()
     old_handler = qInstallMessageHandler(msgHandler);
 }
 
-QStringListModel& AppMessages::getModel()
+AppLogModel *AppMessages::getModel()
 {
-    return debug_strings;
+    return &AppLogModel::getModel();
+}
+
+AppLogModel& AppLogModel::getModel()
+{
+    return instance;
+}
+
+AppLogModel::AppLogModel() : QStringListModel()
+{
+}
+
+void AppLogModel::writeMessages(const QUrl dest_file)
+{
+    const QString writebuffer(stringList().join('\n').append('\n'));
+
+    QtConcurrent::run([dest_file, writebuffer] {
+        emit instance.writeStarted();
+        bool success = false;
+        QFile file(dest_file.toLocalFile());
+        if (file.open(QIODevice::WriteOnly | QIODevice::Text)) {
+            QTextStream out(&file);
+            out << writebuffer;
+            success = out.status() == QTextStream::Ok;
+        }
+        emit instance.writeFinished(success);
+    });
 }

src/QmlControls/AppMessages.h

@@ -23,11 +23,31 @@ This file is part of the QGROUNDCONTROL project
 
 #pragma once
 
-class QStringListModel;
+#include <QObject>
+#include <QStringListModel>
+#include <QUrl>
+
+class AppLogModel : public QStringListModel
+{
+    Q_OBJECT
+public:
+    static AppLogModel& getModel();
+
+    Q_INVOKABLE void writeMessages(const QUrl dest_file);
+
+signals:
+    void writeStarted();
+    void writeFinished(bool success);
+
+private:
+    AppLogModel();
+    static AppLogModel instance;
+};
+
 
 class AppMessages
 {
 public:
     static void installHandler();
-    static QStringListModel& getModel();
+    static AppLogModel* getModel();
 };

src/QmlControls/AppMessages.qml

@@ -93,8 +93,44 @@ QGCView {
             delegate:        delegateItem
         }
 
+        FileDialog {
+            id:             writeDialog
+            folder:         shortcuts.home
+            nameFilters:    ["Log files (*.txt)", "All Files (*)"]
+            selectExisting: false
+            title:          "Select log save file"
+            onAccepted: {
+                debugMessageModel.writeMessages(fileUrl);
+                visible = false;
+            }
+            onRejected:     visible = false
+        }
+
+        Connections {
+            target:          debugMessageModel
+            onWriteStarted:  writeButton.enabled = false;
+            onWriteFinished: writeButton.enabled = true;
+        }
+
+        QGCButton {
+            id:              writeButton
+            anchors.bottom:  parent.bottom
+            anchors.left:    parent.left
+            anchors.margins: ScreenTools.defaultFontPixelWidth
+            onClicked:       writeDialog.visible = true
+            text:            "Save App Log"
+        }
+
+        BusyIndicator {
+            id:              writeBusy
+            anchors.bottom:  writeButton.bottom
+            anchors.left:    writeButton.right
+            height:          writeButton.height
+            visible:        !writeButton.enabled
+        }
+
         QGCButton {
-            id:  followTail
+            id:              followTail
             anchors.bottom:  parent.bottom
             anchors.right:   parent.right
             anchors.margins: ScreenTools.defaultFontPixelWidth

src/ui/MainWindow.cc

@@ -165,7 +165,7 @@ MainWindow::MainWindow()
 
     QQmlEngine::setObjectOwnership(this, QQmlEngine::CppOwnership);
     _mainQmlWidgetHolder->setContextPropertyObject("controller", this);
-    _mainQmlWidgetHolder->setContextPropertyObject("debugMessageModel", &AppMessages::getModel());
+    _mainQmlWidgetHolder->setContextPropertyObject("debugMessageModel", AppMessages::getModel());
     _mainQmlWidgetHolder->setSource(QUrl::fromUserInput("qrc:qml/MainWindowHybrid.qml"));
 
     // Image provider