gwcalcvar.cpp

嵌入式linux下的一个高级计算器程序的源码

/*
    gwCalc.cpp  by Dr. Gerhard Wanderer   ([e-mail])

    $Id: gwCalcVar.cpp,v 1.1 2002/12/15 20:32:52 gerhard Exp gerhard $

    Pocket Calculator for the Zaurus and for Linux with QT-Library
    Variables List Popup
    =====================================================================
*/

#include <ctype.h>
#include <malloc.h>
#include <math.h>
#include <stdio.h>
#include <string.h>

#include <qwidget.h>
#include <qpushbutton.h>
#include <qlabel.h>
#include <qpainter.h>
#include <qheader.h>
#include <qscrollbar.h>
#include <qlineedit.h>

#include "gwCalc.h"

//

VarList::~VarList()
  // delete localy allocated memory 
{
  int i;

  for (i = 0; i < 100; i++) {
    if (vname[i]) free(vname[i]);
  }

}

VarList::VarList(int x, int y)  :  QDialog (0, 0, TRUE)
{
  QHeader    *header;
  int         i;

  initial = 0;
#ifdef ZAURUS
  setGeometry(0,16,240,MAINHEIGHT-90);
#else
  setGeometry(x, y,240,MAINHEIGHT);
#endif
  setCaption("Variables List");

  header = new QHeader(this);
  header->setGeometry(0,0,240,VARHEIGHT);
  header->setOrientation(Horizontal);
  header->addLabel("Name", 112);
  header->addLabel("Content", 128);
  
  for (i = 0; i < VARANZ; i++) {
    n[i] = new QLineEdit(this);  n[i]->setMaxLength(40);
    n[i]->setGeometry(  2, (i+1)*VARHEIGHT, 109, VARHEIGHT);
    v[i] = new QLineEdit(this);  v[i]->setMaxLength(40);
    v[i]->setGeometry(112, (i+1)*VARHEIGHT, 109, VARHEIGHT);
    connect (n[i], SIGNAL(textChanged(const QString &)), 
	     this, SLOT (getValues()));  
    connect (v[i], SIGNAL(textChanged(const QString &)), 
	     this, SLOT (getValues()));  
  }
  for (i = 0; i < 100; i++) vname[i] = NULL;

  count = 0;

  sb = new QScrollBar(Vertical, this);
  sb->setGeometry(224,VARHEIGHT+2,14,VARANZ*VARHEIGHT);
  sb->setMinValue(0);
  sb->setMaxValue(90);
  sb->setPageStep(8);

  connect (sb, SIGNAL(valueChanged(int)), this, SLOT (setPosition(int)));  

#ifndef ZAURUS
  s01 = new QPushButton("Cancel",   this); 
  s01->setGeometry( 60, MAINHEIGHT-30, 60,26);
  s01->setFont (QFont("Helvetica", FONT10, QFont::Normal));
  s02 = new QPushButton("OK",       this); 
  s02->setGeometry(130, MAINHEIGHT-30, 55,26);
  s02->setFont (QFont("Helvetica", FONT10, QFont::Normal));

  connect (s01, SIGNAL(clicked()), this, SLOT (reject()));
  connect (s02, SIGNAL(clicked()), this, SLOT (accept()));
#endif
}

void
VarList::setPosition(int beg)
  //
  // set position of the scroll-list according scrollbar position
{
  char  value[40];
  int   i;

  initial = 0;
  vbeg = beg;
  for (i = 0; i < VARANZ; i++){
    if (vname[beg+i]) {
      n[i]->setText(vname[beg+i]);
      sprintf(value, "%14.12g", vvalue[beg+i]);
      v[i]->setText(value);
    } 
    else {
      n[i]->setText("");
      v[i]->setText("");
    } 
  }
  initial = 1;
} 


void
VarList::AddVar(char *name, double cont, int ref)
  // create local copy of variables
{

  vname[count] = (char*) malloc(strlen(name)+1);
  strcpy(vname[count], name);
  vvalue[count] = cont;
  vref[count] = ref;
  count++;
}

char*
VarList::GetVar(int pos, double *cont, int *ref)
  // restore variables from local copy
{
  *cont = vvalue[pos];
  *ref  = vref[pos];
  return vname[pos];
}

void
VarList::AddVarFinish(int refcnt) 
  // finish creating of local copies; initial display
{
  setPosition(0);
  initial = 1;
  RefCnt  = refcnt;
 }

int
VarList::GetRefCnt() 
  // return changes in timestamp
{
  return RefCnt;
}

void
VarList::getValues() 
{
  // read values from Variable-List, if values changed

  char  *tmp, *text;
  int   i;
  QString  qs;

  if (initial) {
    for (i = 0; i < VARANZ; i++){
      qs = n[i]->text();
      if(qs) {
	tmp = (char*)qs.latin1();
	if (tmp && strlen(tmp)) {
	  text = (char*)malloc(strlen(tmp)+1);
	  strcpy(text, tmp);
	  
	  if (vbeg+i) { // 1.st Entry ANS may not be changed!!
	    if (vname[vbeg+i]) free(vname[vbeg+i]);
	    vname[vbeg+i] = text;
	  
	    qs = v[i]->text();
	    tmp = (char*)qs.latin1();
	    if (tmp && strlen(tmp)) {
	      sscanf(tmp, "%lf", &vvalue[vbeg+i]);
	      vref[vbeg+i] = RefCnt++;
	    }
	    else
	      vvalue[vbeg+i] = 0;
	  }
	}
      }
    }
  }
}