/*-------------------------------------------------------------------*/
/*                                                                   */
/*   Turbo Vision 1.0                                                */
/*   Turbo Vision Demo                                               */
/*   Copyright (c) 1991 by Borland International                     */
/*                                                                   */
/*   Gadgets.cpp:  Gadgets for the Turbo Vision Demo.  Includes a    */
/*        heap view and a clock view which display the clock at the  */
/*        right end of the menu bar and the current heap space at    */
/*        the right end of the status line.                          */
/*-------------------------------------------------------------------*/

#define Uses_TRect

#define Uses_TView

#define Uses_TDrawBuffer

#include <tvision/tv.h>


#include <string.h>

#include <stdlib.h>

#include <ctype.h>

#include <strstrea.h>

#include <iomanip.h>

#include <alloc.h>

#include <time.h>


#include "gadgets.h"




/**
 ** Heap viewer constructor
 **/
THeapView::THeapView(TRect& r) : TView( r )
{
    oldMem = 0;
    newMem = heapSize();
}

/**
 ** Draws heap size data
 **/
void THeapView::draw()
{
    TDrawBuffer buf;
    char c = getColor(2);

    buf.moveChar(0, ' ', c, size.x);
    buf.moveStr(0, heapStr, c);
    writeLine(0, 0, size.x, 1, buf);
}


/**
 ** Updates heap size indicator
 **/
void THeapView::update()
{
    if( (newMem = heapSize()) != oldMem )
        {
        oldMem = newMem;
        drawView();
        }
}


/**
 ** Calculates heap size
 **/
long THeapView::heapSize()
{
    long total = farcoreleft();
    struct farheapinfo heap;
    ostrstream totalStr( heapStr, sizeof heapStr);

    switch( farheapcheck() )
        {
        case _HEAPEMPTY:
            strcpy(heapStr, "     No heap");
            total = -1;
            break;

        case _HEAPCORRUPT:
            strcpy(heapStr, "Heap corrupt");
            total = -2;
            break;

        case _HEAPOK:
            heap.ptr = NULL;
            while(farheapwalk(&heap) != _HEAPEND)
                if(!heap.in_use)
                    total += heap.size;
            totalStr << setw(12) << total << ends;
            break;
        }
    return(total);
}


/**
 ** Clock constructor
 **/
TClockView::TClockView( TRect& r ) : TView( r )
{
    strcpy(lastTime, "        ");
    strcpy(curTime, "        ");
}


/**
 ** Draws clock
 **/
void TClockView::draw()
{
    TDrawBuffer buf;
    char c = getColor(2);

    buf.moveChar(0, ' ', c, size.x);
    buf.moveStr(0, curTime, c);
    writeLine(0, 0, size.x, 1, buf);
}


/**
 ** Updates clock indicator
 **/
void TClockView::update()
{
    time_t t = time(0);
    char *date = ctime(&t);

    date[19] = '\0';
    strcpy(curTime, &date[11]);        /* Extract time. */

    if( strcmp(lastTime, curTime) )
        {
        drawView();
        strcpy(lastTime, curTime);
        }
}