egi_sbtn.c

/*------------------------------------------------------------------------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.

			--- Simple Buttons ---

1. Simple buttons are traditional rectangular buttons, or image icon buttons,
   and their positions in the screen are usually fixed.
   Transparent image icons are not applicable for its transfiguration.
   Pressimg and releaseimg can be cut out from a pre_designed scenario picture,
   for they match up its surrounding pixels so well, it looks like that they
   are just transparent icons.

2. A simple button has only two status: released or pressed.
3. There may be some illustrating effects on the button to show that status
   is just be transformed.
4. A simple button may be transfigured by adopting different image icons.

5. TODO: Simple buttons are only applied for single PAGE programe NOW.
         They can not hook up to an EGI_PAGE yet.
	 OK...You may go deep into sevarl pages, just with some tricks.

6. 		--- Bounce_back buttons ---
   A bounce_back button reacts (execute private command) at time of
   pressing the button, AND at time of releasing. the later one may happens
   when the pen is slided out of the button (Focus lose), it depends on
   your scenario.
   While its geometry shape always changes immediatly at time of pressing.
   ( See example in test_rectBTNs.c )

7. 		--- Switch/Toggle buttons ---
   A switch or toggle button reacts only at time of touching/pressing
   the button, and pen releasing event has no effect on it.
   ( See example in test_rectBTNs.c )


Midas Zhou
midaszhou@yahoo.com(Not in use since 2022_03_01)
------------------------------------------------------------------------*/
#include "egi_sbtn.h"
#include "egi_fbgeom.h"
#include "egi_FTsymbol.h"


/*--------------------------------------------------
Refresh button
1. Clear button and redraw frame.
2. Rewirte its tag.

@btn:   	A pointer to an EGI_RECTBTN.
@tag:		Tag of the button, or NULL.
@tagcolor:	Color of the tag words.

---------------------------------------------------*/
void egi_sbtn_refresh(EGI_RECTBTN *btn, char *tag)
{
        int pixlen;
        //int bith=0;

        if(btn==NULL)
                return;

        /* Set font height/width */
        if(btn->fw < 4 || btn->fh < 4 ) {
                btn->fw=22; btn->fh=22;
        }

	/* 1. Apply pressedimg */
	if(btn->pressed && btn->pressimg != NULL ) {
		/* Transparent image NOT supported! */
		egi_subimg_writeFB(btn->pressimg, &gv_fb_dev, btn->pressimg_subnum, -1, btn->x0, btn->y0);
#if 0 /* TEST */
		EGI_IMGBOX imgbox=btn->pressimg->subimgs[btn->pressimg_subnum];
		fbset_color(WEGI_COLOR_RED);
		draw_rect(&gv_fb_dev, btn->x0, btn->y0,btn->x0+imgbox.w-1, btn->y0+imgbox.h-1);
#endif
	}
	/* 2. Apply releaseimg */
	else if( !btn->pressed && btn->releaseimg != NULL ) {
		/* Transparent image NOT supported! */
		egi_subimg_writeFB(btn->releaseimg, &gv_fb_dev, btn->releaseimg_subnum, -1, btn->x0, btn->y0);
#if 0 /* TEST */
		EGI_IMGBOX imgbox=btn->releaseimg->subimgs[btn->releaseimg_subnum];
		fbset_color(WEGI_COLOR_GREEN);
		draw_rect(&gv_fb_dev, btn->x0, btn->y0,btn->x0+imgbox.w-1, btn->y0+imgbox.h-1);
#endif
	}
	/* 3. Apply button frame */
	else {
	        /* Always clear before write, to fill interior area. */
        	draw_filled_rect2(&gv_fb_dev, btn->color, btn->x0, btn->y0, btn->x0+btn->width-1, btn->y0+btn->height-1);
	        /* Draw frame ( fbdev, type, x0, y0, width, height, w ) */
        	draw_button_frame( &gv_fb_dev, btn->pressed, btn->color, btn->x0, btn->y0, btn->width, btn->height, btn->sw);
	        /* Write TAG */
        	if(tag!=NULL) {
                	//bith=FTsymbol_get_symheight(egi_sysfonts.bold, tag, btn->fw, btn->fh);
	                pixlen=FTsymbol_uft8strings_pixlen( egi_sysfonts.bold, btn->fw, btn->fh,(const unsigned char *)tag);

        	        /* Write tag */
                	FTsymbol_uft8strings_writeFB(  &gv_fb_dev, egi_sysfonts.bold,           /* FBdev, fontface */
                                               btn->fw, btn->fh,(const unsigned char *)tag,     /* fw,fh, pstr */
                                               320, 1, 0,                                       /* pixpl, lines, gap */
                                               btn->x0 +btn->offx +(btn->width-pixlen)/2,       /* x0 */
                                         //btn->y0+(btn->height-btn->fh)/2-(btn->fh-bith)/2,           /* y0 */
                                         btn->y0 +btn->offy +(btn->height-btn->fh)/2, //(btn->pressed?2:0),           /* y0 */
                                               btn->tagcolor, -1, 255,                          /* fontcolor, transcolor,opaque */
                                               NULL, NULL, NULL, NULL);                 	/* *cnt, *lnleft, *penx, *peny */
 		}
	}

}