label.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 label {
   9     char * text;
  10     int length;
  11     int cs;
  12 };
  13
  14 static void labelDraw(newtComponent co);
  15 static void labelDestroy(newtComponent co);
  16
  17 static struct componentOps labelOps = {
  18     labelDraw,
  19     newtDefaultEventHandler,
  20     labelDestroy,
  21     newtDefaultPlaceHandler,
  22     newtDefaultMappedHandler,
  23 } ;
  24
  25 newtComponent newtLabel(int left, int top, const char * text) {
  26     newtComponent co;
  27     struct label * la;
  28
  29     co = malloc(sizeof(*co));
  30     la = malloc(sizeof(struct label));
  31     co->data = la;
  32     co->destroyCallback = NULL;
  33
  34     co->ops = &labelOps;
  35
  36     co->height = 1;
  37     co->width = wstrlen(text, -1);
  38     co->top = top;
  39     co->left = left;
  40     co->takesFocus = 0;
  41     co->isMapped = 0;
  42
  43     la->length = strlen(text);
  44     la->text = strdup(text);
  45     la->cs = COLORSET_LABEL;
  46
  47     return co;
  48 }
  49
  50 void newtLabelSetText(newtComponent co, const char * text) {
  51     int newLength;
  52     struct label * la = co->data;
  53
  54     co->width = wstrlen(text,-1);
  55     newLength = strlen(text);
  56     if (newLength <= la->length) {
  57         memset(la->text, ' ', la->length);
  58         memcpy(la->text, text, newLength);
  59     } else {
  60         free(la->text);
  61         la->text = strdup(text);
  62         la->length = newLength;
  63     }
  64
  65     labelDraw(co);
  66 }
  67
  68 void newtLabelSetColors(newtComponent co, int colorset) {
  69     struct label * la = co->data;
  70
  71     la->cs = colorset;
  72     labelDraw(co);
  73 }
  74
  75 static void labelDraw(newtComponent co) {
  76     struct label * la = co->data;
  77
  78     if (!co->isMapped) return;
  79
  80     SLsmg_set_color(la->cs);
  81
  82     newtGotorc(co->top, co->left);
  83     SLsmg_write_string(la->text);
  84 }
  85
  86 static void labelDestroy(newtComponent co) {
  87     struct label * la = co->data;
  88
  89     free(la->text);
  90     free(la);
  91     free(co);
  92 }