From 9bfa9cecce7074d5aa40593bbe040f249224e127 Mon Sep 17 00:00:00 2001
From: Don Gagne <don@thegagnes.com>
Date: Wed, 5 Nov 2014 14:50:10 -0800
Subject: [PATCH] Delete Settings from preferences

---
 src/QGCCore.cc              |  5 +++++
 src/QGCCore.h               |  2 ++
 src/ui/QGCSettingsWidget.cc | 20 ++++++++++++++++++++
 src/ui/QGCSettingsWidget.h  |  3 +++
 src/ui/QGCSettingsWidget.ui | 16 ++++++++++++++++
 5 files changed, 46 insertions(+)

diff --git a/src/QGCCore.cc b/src/QGCCore.cc
index 7d4510efe..49b9fd78c 100644
--- a/src/QGCCore.cc
+++ b/src/QGCCore.cc
@@ -55,6 +55,7 @@ This file is part of the QGROUNDCONTROL project
 #include "MAVLinkSimulationLink.h"
 #include "SerialLink.h"
 
+const char* QGCCore::deleteAllSettingsKey = "DeleteAllSettingsNextBoot";
 const char* QGCCore::_settingsVersionKey = "SettingsVersion";
 
 /**
@@ -99,9 +100,13 @@ QGCCore::QGCCore(int &argc, char* argv[]) :
     
     QSettings settings;
     
+    // The setting will delete all settings on this boot
+    fClearSettingsOptions |= settings.contains(deleteAllSettingsKey);
+    
     if (fClearSettingsOptions) {
         // User requested settings to be cleared on command line
         settings.clear();
+        settings.setValue(_settingsVersionKey, QGC_SETTINGS_VERSION);
         settings.sync();
     }
     
diff --git a/src/QGCCore.h b/src/QGCCore.h
index b1f73ce93..f3abe0180 100644
--- a/src/QGCCore.h
+++ b/src/QGCCore.h
@@ -60,6 +60,8 @@ public:
     /// @brief Initialize the applicaation.
     /// @return false: init failed, app should exit
     bool init(void);
+    
+    static const char* deleteAllSettingsKey;
 
 protected:
     void startLinkManager();
diff --git a/src/ui/QGCSettingsWidget.cc b/src/ui/QGCSettingsWidget.cc
index e9f24a747..2c9e775fe 100644
--- a/src/ui/QGCSettingsWidget.cc
+++ b/src/ui/QGCSettingsWidget.cc
@@ -10,6 +10,7 @@
 #include "MAVLinkProtocol.h"
 #include "MAVLinkSettingsWidget.h"
 #include "GAudioOutput.h"
+#include "QGCCore.h"
 
 QGCSettingsWidget::QGCSettingsWidget(JoystickInput *joystick, QWidget *parent, Qt::WindowFlags flags) :
     QDialog(parent, flags),
@@ -54,6 +55,8 @@ QGCSettingsWidget::QGCSettingsWidget(JoystickInput *joystick, QWidget *parent, Q
     // Dock widget title bars
     ui->titleBarCheckBox->setChecked(mainWindow->dockWidgetTitleBarsEnabled());
     connect(ui->titleBarCheckBox,SIGNAL(clicked(bool)),mainWindow,SLOT(enableDockWidgetTitleBars(bool)));
+    
+    connect(ui->deleteSettings, &QAbstractButton::toggled, this, &QGCSettingsWidget::_deleteSettingsToggled);
 
     // Custom mode
 
@@ -197,3 +200,20 @@ void QGCSettingsWidget::selectCustomMode(int mode)
     MainWindow::instance()->setCustomMode(static_cast<enum MainWindow::CUSTOM_MODE>(ui->customModeComboBox->itemData(mode).toInt()));
     MainWindow::instance()->showInfoMessage(tr("Please restart QGroundControl"), tr("The optimization selection was changed. The application needs to be closed and restarted to put all optimizations into effect."));
 }
+
+void QGCSettingsWidget::_deleteSettingsToggled(bool checked)
+{
+    if (checked){
+        QMessageBox::StandardButton answer = QMessageBox::question(this,
+                                                                   tr("Delete Settings"),
+                                                                   tr("All saved settgings will be deleted the next time you start QGroundControl. Is this really what you want?"),
+                                                                   QMessageBox::Yes | QMessageBox::No,
+                                                                   QMessageBox::No);
+        if (answer == QMessageBox::Yes) {
+            QSettings settings;
+            settings.setValue(QGCCore::deleteAllSettingsKey, 1);
+        } else {
+            ui->deleteSettings->setChecked(false);
+        }
+    }
+}
diff --git a/src/ui/QGCSettingsWidget.h b/src/ui/QGCSettingsWidget.h
index fb5d85d76..aca37c75e 100644
--- a/src/ui/QGCSettingsWidget.h
+++ b/src/ui/QGCSettingsWidget.h
@@ -24,6 +24,9 @@ public slots:
     void selectStylesheet();
     void selectCustomMode(int mode);
 
+private slots:
+    void _deleteSettingsToggled(bool checked);
+    
 private:
     MainWindow* mainWindow;
     Ui::QGCSettingsWidget* ui;
diff --git a/src/ui/QGCSettingsWidget.ui b/src/ui/QGCSettingsWidget.ui
index 28f48778c..768d04232 100644
--- a/src/ui/QGCSettingsWidget.ui
+++ b/src/ui/QGCSettingsWidget.ui
@@ -151,6 +151,22 @@
          </layout>
         </widget>
        </item>
+       <item>
+        <widget class="QGroupBox" name="groupBox_2">
+         <property name="title">
+          <string>Danger Zone</string>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_4">
+          <item>
+           <widget class="QCheckBox" name="deleteSettings">
+            <property name="text">
+             <string>Delete all saved settings on next boot</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
        <item>
         <spacer name="verticalSpacer">
          <property name="orientation">
-- 
2.22.0