PsL Monthly 1993 December/PSL Monthly Shareware CD-ROM (December 1993).iso/prgmming/dos/pascal/prg_bar.exe/TPROGBAR.CPP

C/C++ Source or Header | 1992-08-29 | 4.8 KB | 190 lines

#define Uses_TStaticText
#define Uses_TStatusDef
#define Uses_TStatusItem
#define Uses_TStatusLine
#define Uses_TEventQueue
#define Uses_TRect
#define Uses_TDeskTop
#define Uses_TView
#define Uses_TWindow
#define Uses_TDialog
#define Uses_TButton
#define Uses_StaticText
#define Uses_TSItem
#define Uses_TEvent
#define Uses_TKeys
#define Uses_TDrawBuffer

#include <tv.h>
__link( RView )
__link( RDialog )
__link( RButton )
#include <mem.h>                       // memset

#include <dos.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "tprogbar.h"

const int sampleIterations = 21 ;


TProgressBar::TProgressBar(TRect& r, unsigned long iters ) : TView ( r )
{
     options |= ofSelectable;
     eventMask = (evKeyboard | evBroadcast);
     maxWidth   = DISPLAYLEN ;//- 1 ;  // newWidth;         // maximum width of thermometer bar
     curWidth   = 0;                    // current width of percentage bar
     oldWidth   = 0;                    // old width of percentage bar
     chPercent  = 100.0/maxWidth;       // percent per character
     maxIter    = iters ;               // maximum iteration
     curIter    = 0;                    // current iteration
     oldPercent = 0;                    // old percentage
    curPercent = 0;                    // current percentage
    backChar   = '░';                  // background character
    percChar   = '▓';                  // foreground character
    bar = new char[ maxWidth + 1];
    memset( bar, backChar, maxWidth );
     bar[ maxWidth ] = '\0';
}

TProgressBar::~TProgressBar()
{
     delete bar ;
}

void TProgressBar::handleEvent(TEvent& event)
{
    TView::handleEvent(event);

    switch(event.what)
    {
    case evKeyboard:
          mainProcess() ;
          break;
     case evBroadcast:
          if(event.message.command == cmOK)
                mainProcess() ;
          break;
     }
     clearEvent(event);
}

void TProgressBar::draw()
{
    char color = getColor(1);
    int i;
    TDrawBuffer nbuf;
    char Buf[DISPLAYLEN+1];

     nbuf.moveChar(0,' ',color,size.x);

     nbuf.moveStr( 0, bar, color ) ;

    writeLine(0, 0, size.x, 1, nbuf);
}

void TProgressBar::mainProcess( void )
{
     unsigned long cnt = 0 ;
     for( int x = 0; x < sampleIterations; x++ )
     {
          setCurIter( ++cnt );         // set the current iteration count & update
          delay(500);
     }
     delay(500);
     message(owner,evCommand,cmOK,this);// close dialog box
}

void TProgressBar::calcPercent ( )
{
     unsigned int percent;
     unsigned int width;

    // calculate the new percentage
    percent = (int) ( ( (double)curIter / (double)maxIter ) * (double)100 );

    // percentage change?
    if ( percent != curPercent )
    {
        oldPercent = curPercent;       // save current percentage
        curPercent = percent;          // save new percentage
        width = curPercent / chPercent;// calculate percentage bar width

        // width change?
        if ( width != curWidth )
          {
            oldWidth = curWidth;       // save the current width
                curWidth = width;          // save new width

            // update the bar string
                if ( oldWidth < curWidth )
            {
                for ( int i = oldWidth; i < curWidth; i++ )
                {
                    bar[i] = percChar;
                }
            }
            else
            {
                for ( int i = curWidth; i < oldWidth; i++ )
                     {
                    bar[i] = backChar;
                }
                }
        }
    }
}

// terminate the thermometer bar display
void TProgressBar::term ( )
{
}

// return the maximum iteration
unsigned long TProgressBar::getMaxIter ( )
{
    return ( maxIter );
}

// return the current iteration
unsigned long TProgressBar::getCurIter ( )
{
     return ( curIter );
}

// set a new maximum iteration & update display
void TProgressBar::setMaxIter ( unsigned long newMax )
{
    unsigned long tmp = maxIter;
    maxIter = newMax;
     memset( bar, backChar, maxWidth );
     curWidth   = 0;                    // current width of percentage bar
     oldWidth   = 0;                    // old width of percentage bar
     curIter    = 0;                    // current iteration
     oldPercent = 0;                    // old percentage
    curPercent = 0;                    // current percentage
     if ( tmp )                // since it starts with 0, only update if changing
    {
          drawView();                       // update the thermometer bar display
    }
}

// set a new current iteration & update display
void TProgressBar::setCurIter ( unsigned long newCur )
{
    unsigned int percent;
    unsigned int width;

    curIter = newCur;

    calcPercent();

     // width change?
     if ( curPercent != oldPercent )
     {
          drawView();                       // paint the thermometer bar
     }
}