task.hxx

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#ifndef INCLUDED_VCL_TASK_HXX
#define INCLUDED_VCL_TASK_HXX

#include <vcl/dllapi.h>

struct ImplSchedulerData;

enum class TaskPriority
{
    HIGHEST,       
    DEFAULT,       
    // Input from the OS event queue is processed before HIGH_IDLE tasks.
    HIGH_IDLE,     
    RESIZE,        
    REPAINT,       
    POST_PAINT,    
    DEFAULT_IDLE,  
    LOWEST         
};

#define PRIO_COUNT (static_cast<int>(TaskPriority::LOWEST) + 1)

class VCL_DLLPUBLIC Task
{
    friend class Scheduler;
    friend struct ImplSchedulerData;

    ImplSchedulerData *mpSchedulerData; 
    const char        *mpDebugName;     
    TaskPriority       mePriority;      
    bool               mbActive;        
    bool               mbStatic;        

protected:
    static void StartTimer( sal_uInt64 nMS );

    const ImplSchedulerData* GetSchedulerData() const { return mpSchedulerData; }

    virtual void SetDeletionFlags();

    virtual sal_uInt64 UpdateMinPeriod( sal_uInt64 nTimeNow ) const = 0;

public:
    Task( const char *pDebugName );
    Task( const Task& rTask );
    virtual ~Task() COVERITY_NOEXCEPT_FALSE;
    Task& operator=( const Task& rTask );

    void            SetPriority(TaskPriority ePriority);
    TaskPriority    GetPriority() const { return mePriority; }

    const char     *GetDebugName() const { return mpDebugName; }

    // Call handler
    virtual void    Invoke() = 0;

    virtual void Start(bool bStartTimer = true);
    void            Stop();

    bool            IsActive() const { return mbActive; }

    void            SetStatic() { mbStatic = true; }
    bool            IsStatic() const { return mbStatic; }
};

#endif // INCLUDED_VCL_TASK_HXX

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