1 files changed, 105 insertions, 0 deletions
diff --git a/library/status_handler.h b/library/status_handler.h
new file mode 100644
index 00000000..a1226c54
--- /dev/null
+++ b/library/status_handler.h
@@ -0,0 +1,105 @@
+// **************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
+// * Copyright (C) 2008-2010 ZenJu (zhnmju123 AT gmx.de)                    *
+// **************************************************************************
+//
+#ifndef STATUSHANDLER_H_INCLUDED
+#define STATUSHANDLER_H_INCLUDED
+
+#include <wx/longlong.h>
+
+class Zstring;
+
+
+const int UI_UPDATE_INTERVAL = 100; //perform ui updates not more often than necessary, 100 seems to be a good value with only a minimal performance loss
+
+bool updateUiIsAllowed(); //test if a specific amount of time is over
+void updateUiNow();       //do the updating
+
+
+//interfaces for status updates (can be implemented by GUI or Batch mode)
+//overwrite virtual methods for respective functionality
+
+class ErrorHandler
+{
+public:
+    ErrorHandler() {}
+    virtual ~ErrorHandler() {}
+
+    enum Response
+    {
+        IGNORE_ERROR = 10,
+        RETRY
+    };
+    virtual Response reportError(const Zstring& errorMessage) = 0;
+};
+
+
+class StatusHandler
+{
+public:
+    StatusHandler() : abortRequested(false) {}
+    virtual ~StatusHandler() {}
+
+    //identifiers of different processes
+    enum Process
+    {
+        PROCESS_NONE = 10,
+        PROCESS_SCANNING,
+        PROCESS_COMPARING_CONTENT,
+        PROCESS_SYNCHRONIZING
+    };
+
+    //these methods have to be implemented in the derived classes to handle error and status information
+    virtual void initNewProcess(int objectsTotal, wxLongLong dataTotal, Process processID) = 0; //informs about the total amount of data that will be processed from now on
+    virtual void updateStatusText(const Zstring& text) = 0;
+    virtual void updateProcessedData(int objectsProcessed, wxLongLong dataProcessed) = 0;  //called periodically after data was processed
+
+    //this method is triggered repeatedly by requestUiRefresh() and can be used to refresh the ui by dispatching pending events
+    virtual void forceUiRefresh() = 0;
+
+    void requestUiRefresh(bool allowAbort = true); //opportunity to abort must be implemented in a frequently executed method like requestUiRefresh()
+    void requestAbortion();  //this does NOT call abortThisProcess immediately, but when appropriate (e.g. async. processes finished)
+    bool abortIsRequested();
+
+    //error handling:
+    virtual ErrorHandler::Response reportError(const wxString& errorMessage) = 0; //recoverable error situation
+    virtual void reportFatalError(const wxString& errorMessage) = 0;              //non-recoverable error situation, implement abort!
+    virtual void reportWarning(const wxString& warningMessage, bool& warningActive) = 0;
+
+private:
+    virtual void abortThisProcess() = 0;
+
+    bool abortRequested;
+};
+
+
+
+//##############################################################################
+inline
+void StatusHandler::requestUiRefresh(bool allowAbort)
+{
+    if (updateUiIsAllowed())  //test if specific time span between ui updates is over
+        forceUiRefresh();
+
+    if (abortRequested && allowAbort)
+        abortThisProcess();  //abort can be triggered by requestAbortion()
+}
+
+
+inline
+void StatusHandler::requestAbortion()
+{
+    abortRequested = true;
+}
+
+
+inline
+bool StatusHandler::abortIsRequested()
+{
+    return abortRequested;
+}
+
+
+#endif // STATUSHANDLER_H_INCLUDED