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author | reinelt <reinelt@3ae390bd-cb1e-0410-b409-cd5a39f66f1f> | 2004-01-14 11:33:00 +0000 |
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committer | reinelt <reinelt@3ae390bd-cb1e-0410-b409-cd5a39f66f1f> | 2004-01-14 11:33:00 +0000 |
commit | 504656e9484752c9c0596f153f27089c1961f501 (patch) | |
tree | 8322150effdcffca715e116498851a2bba00c953 /widget_text.c | |
parent | 90a08f4f1082f25ab999d8a331dcbea512778a47 (diff) | |
download | lcd4linux-504656e9484752c9c0596f153f27089c1961f501.tar.gz |
[lcd4linux @ 2004-01-14 11:33:00 by reinelt]
new plugin 'uname' which does what it's called
text widget nearly finished
first results displayed on MatrixOrbital
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@310 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
Diffstat (limited to 'widget_text.c')
-rw-r--r-- | widget_text.c | 214 |
1 files changed, 190 insertions, 24 deletions
diff --git a/widget_text.c b/widget_text.c index 4fc1ef8..95401ed 100644 --- a/widget_text.c +++ b/widget_text.c @@ -1,4 +1,4 @@ -/* $Id: widget_text.c,v 1.3 2004/01/13 08:18:20 reinelt Exp $ +/* $Id: widget_text.c,v 1.4 2004/01/14 11:33:00 reinelt Exp $ * * simple text widget handling * @@ -21,6 +21,11 @@ * * * $Log: widget_text.c,v $ + * Revision 1.4 2004/01/14 11:33:00 reinelt + * new plugin 'uname' which does what it's called + * text widget nearly finished + * first results displayed on MatrixOrbital + * * Revision 1.3 2004/01/13 08:18:20 reinelt * timer queues added * liblcd4linux deactivated turing transformation to new layout @@ -49,33 +54,150 @@ #include <stdlib.h> #include <stdio.h> #include <string.h> +#include <ctype.h> #include "debug.h" #include "cfg.h" +#include "evaluator.h" #include "timer.h" #include "widget.h" +#include "widget_text.h" -typedef struct WIDGET_TEXT { - char *value; - char *align; - int width; - int update; -} WIDGET_TEXT; +void widget_text_scroll (void *Self) +{ + WIDGET *W = (WIDGET*)Self; + WIDGET_TEXT *T = W->data; + + int num, len, pad; + char *src, *dst; + + src=T->value; + dst=T->buffer; + num=0; + len=strlen(T->value); + switch (T->align) { + case ALIGN_LEFT: + pad=0; + break; + case ALIGN_CENTER: + pad=(T->width - len)/2; + if (pad<0) pad=0; + break; + case ALIGN_RIGHT: + pad=T->width - len; + if (pad<0) pad=0; + break; + case ALIGN_MARQUEE: + pad=T->width - T->scroll; + T->scroll++; + if (T->scroll >= T->width+len) T->scroll=0; + break; + default: // not reached + pad=0; + } + + // pad blanks on the beginning + while (pad>0) { + *(dst++)=' '; + num++; + pad--; + } + + // overread src (marquee) + while (pad<0) { + src++; + pad++; + } + + // copy content + while (num < T->width) { + if (*src=='\0') break; + *(dst++)=*(src++); + num++; + } + + // pad blanks on the end + while (num < T->width) { + *(dst++)=' '; + num++; + } + *dst='\0'; + + // finally, draw it! + if (W->class->draw) + W->class->draw(W); +} + -void widget_text_callback (void *vSelf) +void widget_text_update (void *Self) { - WIDGET *Self=(WIDGET*)vSelf; + WIDGET *W = (WIDGET*)Self; + WIDGET_TEXT *T = W->data; + RESULT result = {0, 0.0, NULL}; + char *value; - debug ("callback: Self->name=%s", Self->name); + // evaluate expression + Eval(T->expression, &result); + + // string or number? + if (T->precision==0xC0DE) { + value=strdup(R2S(&result)); + } else { + double number=R2N(&result); + int width=T->width; + int precision=T->precision; + // print zero bytes so we can specify NULL as target + // and get the length of the resulting string + int size=snprintf (NULL, 0, "%.*f", precision, number); + // number does not fit into field width: try to reduce precision + if (size>width && precision>0) { + int delta=size-width; + if (delta>precision) delta=precision; + precision-=delta; + size-=delta; + // zero precision: omit decimal point, too + if (precision==0) size--; + } + // number still doesn't fit: display '*****' + if (size>width) { + debug ("overflow"); + value=malloc(width+1); + memset (value, '*', width); + *(value+width)='\0'; + } else { + value=malloc(size+1); + snprintf (value, size+1, "%.*f", precision, number); + } + } + + // has value changed? + if (T->value == NULL || strcmp(T->value, value)!=0) { + // free old value + if (T->value) free (T->value); + T->value=value; + // reset marquee counter + T->scroll=0; + // if there's a marquee scroller active, it has its own + // update callback timer, so we do nothing here; otherwise + // we simply call this scroll callback directly + if (T->align!=ALIGN_MARQUEE) { + widget_text_scroll (Self); + } + } else { + // value is the same, so free our buffer + free (value); + } + + DelResult (&result); } -int widget_text_init (WIDGET *Self) { - - char *section; - WIDGET_TEXT *data; +int widget_text_init (WIDGET *Self) +{ + char *section; char *c; + WIDGET_TEXT *T; // prepare config section // strlen("Widget:")=7 @@ -83,20 +205,65 @@ int widget_text_init (WIDGET *Self) { strcpy(section, "Widget:"); strcat(section, Self->name); - data=malloc(sizeof(WIDGET_TEXT)); + T=malloc(sizeof(WIDGET_TEXT)); + memset (T, 0, sizeof(WIDGET_TEXT)); + + // get raw expression (we evaluate it ourselves) + T->expression = cfg_get_raw (section, "expression", "''"); - data->value = cfg_get (section, "value", "''"); - data->align = cfg_get (section, "align", "L"); + // field width, default 10 + cfg_number (section, "width", 10, 0, 99999, &(T->width)); - cfg_number (section, "width", 5, 0, 99999, &(data->width)); - cfg_number (section, "update", -1, -1, 99999, &(data->update)); + // precision: number of digits after the decimal point (default: none) + // Note: this is the *maximum* precision on small values, + // for larger values the precision may be reduced to fit into the field width. + // The default value 0xC0DE is used to distinguish between numbers and strings: + // if no precision is given, the result is always treated as a string. If a + // precision is specified, the result is treated as a number. + cfg_number (section, "precision", 0xC0DE, 0, 80, &(T->precision)); - free (section); - Self->data=data; + // field alignment: Left (default), Center, Right or Marquee + c = cfg_get (section, "align", "L"); + switch (toupper(*c)) { + case 'L': + T->align=ALIGN_LEFT; + break; + case 'C': + T->align=ALIGN_CENTER; + break; + case 'R': + T->align=ALIGN_RIGHT; + break; + case 'M': + T->align=ALIGN_MARQUEE; + break; + default: + error ("widget %s has unknown alignment '%s', using 'Left'", section, c); + T->align=ALIGN_LEFT; + } + free (c); + + // update interval (msec), default 1 sec + cfg_number (section, "update", 1000, 10, 99999, &(T->update)); - debug ("timer_add: Self=%p Self->name=%s", Self, Self->name); - timer_add (widget_text_callback, Self, 200, 0); + // marquee scroller speed: interval (msec), default 500msec + if (T->align==ALIGN_MARQUEE) { + cfg_number (section, "speed", 500, 10, 99999, &(T->speed)); + } + // buffer + T->buffer=malloc(T->width+1); + + free (section); + Self->data=T; + + timer_add (widget_text_update, Self, T->update, 0); + + // a marquee scroller has its own timer and callback + if (T->align==ALIGN_MARQUEE) { + timer_add (widget_text_scroll, Self, T->speed, 0); + } + return 0; } @@ -117,7 +284,6 @@ int widget_text_quit (WIDGET *Self) { WIDGET_CLASS Widget_Text = { name: "text", init: widget_text_init, - update: NULL, draw: NULL, quit: widget_text_quit, }; |