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#ifndef STATUSHANDLER_H_INCLUDED
#define STATUSHANDLER_H_INCLUDED
#include "zstring.h"
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 updateStatusText(const Zstring& text) = 0;
virtual void initNewProcess(int objectsTotal, double dataTotal, Process processID) = 0; //informs about the total amount of data that will be processed from now on
virtual void updateProcessedData(int objectsProcessed, double 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 asyncProcessActive = false)
{
if (updateUiIsAllowed()) //test if specific time span between ui updates is over
forceUiRefresh();
if (abortRequested && !asyncProcessActive)
abortThisProcess(); //abort can be triggered by requestAbortion()
}
void requestAbortion() //opportunity to abort must be implemented in a frequently executed method like requestUiRefresh()
{ //currently used by the UI status information screen, when button "Abort is pressed"
abortRequested = true;
}
//error handling:
virtual ErrorHandler::Response reportError(const Zstring& errorMessage) = 0; //recoverable error situation
virtual void reportFatalError(const Zstring& errorMessage) = 0; //non-recoverable error situation, implement abort!
virtual void reportWarning(const Zstring& warningMessage, bool& dontShowAgain) = 0;
protected:
virtual void abortThisProcess() = 0;
bool abortRequested;
};
#endif // STATUSHANDLER_H_INCLUDED
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