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added pingpong scrolling

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git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@849 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
This commit is contained in:
michux
2008-01-28 17:03:27 +00:00
parent 64fa72b054
commit 2e6a20b9a8
2 changed files with 53 additions and 5 deletions
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54
widget_text.c
View File

@@ -5,6 +5,7 @@
*
* Copyright (C) 2003, 2004 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
* Copyright (C) 2008 Michael Vogt <michu@neophob.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -95,6 +96,42 @@ void widget_text_scroll(void *Self)
T->scroll++;
if (T->scroll >= width + len)
T->scroll = 0;
break;
case ALIGN_PINGPONG:
#define PINGPONGWAIT 2
/* scrolling is not necessary - center the string */
if (len <= width) {
pad = (width - len) / 2;
}
else {
if (T->direction == 1)
T->scroll++; /* scroll right */
else
T->scroll--; /* scroll left */
/*pad = if positive, add leading space characters, else offset of string begin */
pad = 0-T->scroll;
if (pad < 0-(len-width)) {
if (T->delay-- < 1) { /* wait before switch direction */
T->direction = 0; /* change scroll direction */
T->delay = PINGPONGWAIT;
T->scroll -= PINGPONGWAIT;
} /* else debug("wait1"); */
pad = 0-(len-width);
}
else
if (pad > 0) {
if (T->delay-- < 1) {
T->direction = 1;
T->delay = PINGPONGWAIT;
T->scroll += PINGPONGWAIT;
} /* else debug("wait2"); */
pad = 0;
}
}
break;
default: /* not reached */
pad = 0;
@@ -219,12 +256,18 @@ void widget_text_update(void *Self)
/* something has changed and should be updated */
if (update) {
/* reset marquee counter if content has changed */
/* reset marquee counter if content has changed */
T->scroll = 0;
/* Init pingpong scroller. start scrolling left (wrong way) to get a delay */
if (T->align == ALIGN_PINGPONG) {
T->direction = 0;
T->delay = PINGPONGWAIT;
}
/* 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 || T->align != ALIGN_AUTOMATIC) {
if (T->align != ALIGN_MARQUEE || T->align != ALIGN_AUTOMATIC || T->align != ALIGN_PINGPONG) {
widget_text_scroll(Self);
}
}
@@ -287,6 +330,9 @@ int widget_text_init(WIDGET * Self)
case 'A':
Text->align = ALIGN_AUTOMATIC;
break;
case 'P':
Text->align = ALIGN_PINGPONG;
break;
default:
error("widget %s has unknown alignment '%s', using 'Left'", section, c);
Text->align = ALIGN_LEFT;
@@ -300,7 +346,7 @@ int widget_text_init(WIDGET * Self)
Text->update = 10;
/* marquee scroller speed: interval (msec), default 500msec */
if (Text->align == ALIGN_MARQUEE || Text->align == ALIGN_AUTOMATIC) {
if (Text->align == ALIGN_MARQUEE || Text->align == ALIGN_AUTOMATIC || Text->align == ALIGN_PINGPONG) {
cfg_number(section, "speed", 500, 10, -1, &(Text->speed));
}
@@ -314,7 +360,7 @@ int widget_text_init(WIDGET * Self)
timer_add(widget_text_update, Self, Text->update, Text->update == 0);
/* a marquee scroller has its own timer and callback */
if (Text->align == ALIGN_MARQUEE || Text->align == ALIGN_AUTOMATIC) {
if (Text->align == ALIGN_MARQUEE || Text->align == ALIGN_AUTOMATIC || Text->align == ALIGN_PINGPONG) {
timer_add(widget_text_scroll, Self, Text->speed, 0);
}

4
widget_text.h
View File

@@ -30,7 +30,7 @@
#include "property.h"
typedef enum { ALIGN_LEFT, ALIGN_CENTER, ALIGN_RIGHT, ALIGN_MARQUEE, ALIGN_AUTOMATIC } TEXT_ALIGN;
typedef enum { ALIGN_LEFT, ALIGN_CENTER, ALIGN_RIGHT, ALIGN_MARQUEE, ALIGN_AUTOMATIC, ALIGN_PINGPONG } TEXT_ALIGN;
typedef struct WIDGET_TEXT {
PROPERTY prefix; /* label on the left side */
@@ -45,6 +45,8 @@ typedef struct WIDGET_TEXT {
int update; /* update interval */
int scroll; /* marquee starting point */
int speed; /* marquee scrolling speed */
int direction; /* pingpong direction, 0=right, 1=left */
int delay; /* pingpong scrolling, wait before switch direction */
} WIDGET_TEXT;