RemoteLinux: Block cloning of device configs when the dialog is open.

Change-Id: Ifc8bc835765ac8b92efbccf57e6d0d7a01998a58
Reviewed-on: http://codereview.qt-project.org/6322
Reviewed-by: Christian Kandeler <christian.kandeler@nokia.com>
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>

src/plugins/remotelinux/linuxdeviceconfigurations.cpp

@@ -52,6 +52,8 @@ const QLatin1String IdCounterKey("IdCounter");
 const QLatin1String ConfigListKey("ConfigList");
 const QLatin1String DefaultKeyFilePathKey("DefaultKeyFile");
 
+bool cloningBlocked = false;
+
 class DevConfNameMatcher
 {
 public:
@@ -103,6 +105,8 @@ void LinuxDeviceConfigurations::replaceInstance(const LinuxDeviceConfigurations
 
 LinuxDeviceConfigurations *LinuxDeviceConfigurations::cloneInstance()
 {
+    if (cloningBlocked)
+        return 0;
     LinuxDeviceConfigurations * const other = new LinuxDeviceConfigurations(0);
     copy(LinuxDeviceConfigurationsPrivate::instance, other, true);
     return other;
@@ -256,6 +260,18 @@ LinuxDeviceConfigurations::LinuxDeviceConfigurations(QObject *parent)
 {
 }
 
+void LinuxDeviceConfigurations::blockCloning()
+{
+    QTC_ASSERT(!cloningBlocked, return);
+    cloningBlocked = true;
+}
+
+void LinuxDeviceConfigurations::unblockCloning()
+{
+    QTC_ASSERT(cloningBlocked, return);
+    cloningBlocked = false;
+}
+
 LinuxDeviceConfigurations::~LinuxDeviceConfigurations()
 {
     delete d;

src/plugins/remotelinux/linuxdeviceconfigurations.h

@@ -42,16 +42,24 @@ QT_FORWARD_DECLARE_CLASS(QString)
 namespace RemoteLinux {
 namespace Internal {
 class LinuxDeviceConfigurationsPrivate;
+class LinuxDeviceConfigurationsSettingsWidget;
 } // namespace Internal
 
 class REMOTELINUX_EXPORT LinuxDeviceConfigurations : public QAbstractListModel
 {
     Q_OBJECT
+    friend class Internal::LinuxDeviceConfigurationsSettingsWidget;
 public:
     ~LinuxDeviceConfigurations();
 
     static LinuxDeviceConfigurations *instance(QObject *parent = 0);
 
+    // If you want to edit the list of device configurations programatically
+    // (e.g. when doing device auto-detection), call cloneInstance() to get a copy,
+    // do the changes there and then call replaceInstance() to write them back.
+    // Callers must be prepared to deal with cloneInstance() temporarily returning null,
+    // which happens if the settings dialog is currently open.
+    // All other callers are required to do the clone/replace operation synchronously!
     static void replaceInstance(const LinuxDeviceConfigurations *other);
     static LinuxDeviceConfigurations *cloneInstance();
 
@@ -82,6 +90,9 @@ signals:
 private:
     LinuxDeviceConfigurations(QObject *parent);
 
+    static void blockCloning();
+    static void unblockCloning();
+
     void load();
     void save();
     static void copy(const LinuxDeviceConfigurations *source,

src/plugins/remotelinux/linuxdeviceconfigurationssettingswidget.cpp

@@ -104,6 +104,7 @@ LinuxDeviceConfigurationsSettingsWidget::LinuxDeviceConfigurationsSettingsWidget
       m_saveSettingsRequested(false),
       m_additionalActionsMapper(new QSignalMapper(this))
 {
+    LinuxDeviceConfigurations::blockCloning();
     initGui();
     connect(m_additionalActionsMapper, SIGNAL(mapped(QString)),
         SLOT(handleAdditionalActionRequest(QString)));
@@ -116,6 +117,7 @@ LinuxDeviceConfigurationsSettingsWidget::~LinuxDeviceConfigurationsSettingsWidge
             currentIndex());
         LinuxDeviceConfigurations::replaceInstance(m_devConfigs.data());
     }
+    LinuxDeviceConfigurations::unblockCloning();
     delete m_ui;
 }