scale.c

   1 #include <slang.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 #include "newt.h"
   6 #include "newt_pr.h"
   7
   8 struct scale {
   9     long long fullValue;
  10     int charsSet;
  11     unsigned int percentage;
  12     int csEmpty;
  13     int csFull;
  14 };
  15
  16 static void scaleDraw(newtComponent co);
  17
  18 static struct componentOps scaleOps = {
  19     scaleDraw,
  20     newtDefaultEventHandler,
  21     NULL,
  22     newtDefaultPlaceHandler,
  23     newtDefaultMappedHandler,
  24 } ;
  25
  26 newtComponent newtScale(int left, int top, int width, long long fullValue) {
  27     newtComponent co;
  28     struct scale * sc;
  29
  30     co = malloc(sizeof(*co));
  31     sc = malloc(sizeof(struct scale));
  32     co->data = sc;
  33     co->destroyCallback = NULL;
  34
  35     co->ops = &scaleOps;
  36
  37     co->height = 1;
  38     co->width = width;
  39     co->top = top;
  40     co->left = left;
  41     co->takesFocus = 0;
  42
  43     sc->fullValue = fullValue;
  44     sc->charsSet = 0;
  45     sc->percentage = 0;
  46     sc->csEmpty = NEWT_COLORSET_EMPTYSCALE;
  47     sc->csFull = NEWT_COLORSET_FULLSCALE;
  48
  49     return co;
  50 }
  51
  52 void newtScaleSet(newtComponent co, unsigned long long amount) {
  53     struct scale * sc = co->data;
  54     int newPercentage;
  55
  56     if (amount >= sc->fullValue) {
  57         newPercentage = 100;
  58         sc->charsSet = co->width;
  59     } else if (sc->fullValue >= -1ULL / (100 > co->width ? 100 : co->width)) {
  60         /* avoid overflow on large numbers */
  61         sc->charsSet = amount / (sc->fullValue / co->width);
  62         newPercentage = amount / (sc->fullValue / 100);
  63     } else {
  64         sc->charsSet = (amount * co->width) / sc->fullValue;
  65         newPercentage = (amount * 100) / sc->fullValue;
  66     }
  67
  68     if (newPercentage != sc->percentage) {
  69         sc->percentage = newPercentage;
  70         scaleDraw(co);
  71     }
  72 }
  73
  74 void newtScaleSetColors(newtComponent co, int empty, int full) {
  75     struct scale * sc = co->data;
  76
  77     sc->csEmpty = empty;
  78     sc->csFull = full;
  79     scaleDraw(co);
  80 }
  81
  82 static void scaleDraw(newtComponent co) {
  83     struct scale * sc = co->data;
  84     int i;
  85     int xlabel = (co->width-4) /2;
  86     char percent[10];
  87
  88     if (co->top == -1) return;
  89
  90     newtGotorc(co->top, co->left);
  91
  92     sprintf(percent, "%3d%%", sc->percentage);
  93
  94     SLsmg_set_color(sc->csFull);
  95
  96     for (i = 0; i < co->width; i++) {
  97         if (i == sc->charsSet)
  98             SLsmg_set_color(sc->csEmpty);
  99         if (i >= xlabel && i < xlabel+4)
 100             SLsmg_write_char(percent[i-xlabel]);
 101         else
 102             SLsmg_write_char(' ');
 103     }
 104     /* put cursor at beginning of text for better accessibility */
 105     newtGotorc(co->top, co->left + xlabel);
 106 }