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106 lines
3.5 KiB
106 lines
3.5 KiB
/***************************************************************************
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filesource.h - description
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-------------------
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begin : Son Feb 10 2002
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copyright : (C) 2002 by Thomas Kabelmann
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email : tk78@gmx.de
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef FILESOURCE_H
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#define FILESOURCE_H
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/**@class FileSource
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*FileSource is an asynchronous class for reloading star data while running
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*the program. It's basing on TQDataSource class and implements the function
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*for reading a file step by step and send these data to an TQDataSink object.
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*KStarsData uses this class for asynchronous io.
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*@author Thomas Kabelmann
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*@version 1.0
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*/
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#include <tqasyncio.h>
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#include <tqstring.h>
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class KStarsData;
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class KSFileReader;
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class FileSource : public TQDataSource {
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public:
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/**constructor needs an KStarsData object, a file name and the new magnitude
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*/
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FileSource( KStarsData *ksdata, float magnitude );
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/** destructor */
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~FileSource();
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/**send a value indicating whether the object is ready to send data.
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*@return 1 if data is ready to send; return -1 if the stream is finished.
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*/
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int readyToSend();
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/**Is this object rewindable?
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*@return false, because it's not needed to rewind.
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*/
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bool rewindable() { return false; }
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/**The function for sending data to an TQDataSink object. Here will all data
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*operations defined. Because this function is virtual, we need a second int
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*parameter, but we don't use it, so it's unnamed.
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*@p sink pointer to the TQDataSink object which will receive the data stream
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*/
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void sendTo( TQDataSink *sink, int );
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/**@return current magnitude to load (always returns maxMagnitude)
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*/
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float magnitude() { return maxMagnitude; }
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private:
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bool readingData;
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KSFileReader *fileReader;
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// which sao file should be opened and which line
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int fileNumber, lineNumber;
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// counts blocksize
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int counter;
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// new magnitude to load
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float maxMagnitude;
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KStarsData *data;
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/**maxLines defines how many lines in data file should be read and
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*send to TQDataSink. This is only needed if a data block is longer
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*than the max defined lines. I figured out this value of 500
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*on a fast system, so if it is to high the value might be decreased.
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*A high value means faster reloading but perhaps on slow systems this
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*might interrupt the main event loop.
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*A low value needs longer to reload data, but it doesn't interrupt the
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*main event loop (it's smoother).
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*But it's important to know that 500 lines to read is very fast, but
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*appending to TQPtrList in StarDataSink will take the most time and this
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*will also defined with this value.
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*/
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#define maxLines 500
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/**The loaded data will stored in a string array and a pointer to first
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*object in array will send to StarDataSink.
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*/
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TQString stringArray[ maxLines ];
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};
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#endif
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