Make QgsTask::start private

Only allow starting tasks to be done by QgsTaskManager

Author: nyalldawson

python/core/qgstaskmanager.sip

@@ -86,14 +86,6 @@ class QgsTask : QObject
      */
     double progress() const;
 
-    /**
-     * Starts the task. Should only be called for tasks which are not being
-     * handled by a QgsTaskManager. If the task is managed by a QgsTaskManager
-     * then this method should not be called directly, instead it is left to the
-     * task manager to start the task when appropriate.
-     */
-    void start();
-
     /**
      * Notifies the task that it should terminate. Calling this is not guaranteed
      * to immediately end the task, rather it sets the isCancelled() flag which

src/core/qgstaskmanager.h

@@ -117,14 +117,6 @@ class CORE_EXPORT QgsTask : public QObject
      */
     double progress() const { return mTotalProgress; }
 
-    /**
-     * Starts the task. Should only be called for tasks which are not being
-     * handled by a QgsTaskManager. If the task is managed by a QgsTaskManager
-     * then this method should not be called directly, instead it is left to the
-     * task manager to start the task when appropriate.
-     */
-    void start();
-
     /**
      * Notifies the task that it should terminate. Calling this is not guaranteed
      * to immediately end the task, rather it sets the isCancelled() flag which
@@ -323,13 +315,21 @@ class CORE_EXPORT QgsTask : public QObject
     };
     QList< SubTask > mSubTasks;
 
+
+    /**
+     * Starts the task. Should not be public as only QgsTaskManagers can initiate tasks.
+     */
+    void start();
+
     void processSubTasksForCompletion();
 
     void processSubTasksForTermination();
 
     void processSubTasksForHold();
 
     friend class QgsTaskManager;
+    friend class QgsTaskRunnableWrapper;
+    friend class TestQgsTaskManager;
 
 };