screen_obj_v1_02.c

LPC2300 MP3 Player code

#include "app_config.h"

#include "app_screen_obj.h"

void (*screen_init_func)(void);
unsigned char screen_init_flag = 0;

so_obj_t so_obj[MAX_SCR_OBJ];
unsigned char layer[MAX_SCR_OBJ];
unsigned char last_obj_id;
unsigned char last_on_obj_id;

unsigned char so_obj_is_white_null(so_pos_t lhpos,so_pos_t lvpos)
{
	return (0);
}

void so_obj_task100ms_null(void)
{
}

void so_obj_up_null(unsigned char last_obj_id)
{
}

void so_obj_leave_null(unsigned char new_obj_id)
{
}

void so_obj_do_null(so_pos_t lhpos,so_pos_t lvpos,so_pos_t ghpos,so_pos_t gvpos,pstatus_t p_stat)
{
}

void so_obj_draw_null(void)
{
}

void ScrObjDraw(void) //draw active window from lowest layer to top layer
{
	unsigned char obj_id;
	int i;
		
	for (i=MAX_SCR_OBJ-1; i>=0; i--)
	{
		obj_id = layer[i];
		if (so_obj[obj_id].stat != SO_ST_OFF)
			so_obj[obj_id].draw();
	}	
}

void ScrObjToTopLayer(unsigned char obj_id)	//set this window to top and rearrange layer stack
{
	unsigned char i;
	unsigned char shift_flag = 0;

	for (i=MAX_SCR_OBJ-1; i>0; i--)
	{
		if (layer[i] == obj_id)
		{
			shift_flag = 1;
		}
		if (shift_flag)
		{
			layer[i] = layer[i-1];
		}
	}

	layer[0] = obj_id;
}

void ScrObjRemoveLayer(unsigned char obj_id)
{
	unsigned char i;
	unsigned char shift_flag = 0;

	for (i=0; i<MAX_SCR_OBJ-1; i++)
	{
		if (layer[i] == obj_id)
		{
			shift_flag = 1;
		}
		if (shift_flag)
		{
			layer[i] = layer[i+1];
		}
	}

	layer[MAX_SCR_OBJ - 1] = obj_id;
}

int ScrObjDo(so_pos_t ghpos,so_pos_t gvpos,pstatus_t p_stat) //return object id or -1 when nothing found
{
	unsigned char i,obj_id;
	unsigned short hmin,vmin,hmax,vmax;
	so_pos_t lhpos,lvpos;
	int found_obj_id = -1;
		
	switch (p_stat)
	{
		case PST_DOWN : //find from top layer
			for (i=0; i<MAX_SCR_OBJ; i++)
			{
				obj_id = layer[i];
				if (so_obj[obj_id].stat != SO_ST_OFF)
				{
					hmin = so_obj[obj_id].horigin;
					vmin = so_obj[obj_id].vorigin;
					hmax = so_obj[obj_id].horigin + so_obj[obj_id].hsize;
					vmax = so_obj[obj_id].vorigin + so_obj[obj_id].vsize;
					if (hmax > SCREEN_HSIZE - 1)
						hmax = SCREEN_HSIZE - 1;
					if (vmax > SCREEN_VSIZE - 1)
						vmax = SCREEN_VSIZE - 1;
					if ((ghpos >= hmin) && (ghpos < hmax) && (gvpos >= vmin) && (gvpos < vmax))
					{
						lhpos = ghpos - hmin;
						lvpos = gvpos - vmin;
						if (!so_obj[obj_id].is_white(lhpos,lvpos))
						{
							if ((last_on_obj_id != obj_id) && (last_on_obj_id < MAX_SCR_OBJ))
								so_obj[last_on_obj_id].leave(obj_id);
							if (last_on_obj_id != obj_id)
								so_obj[obj_id].up(last_on_obj_id);
							so_obj[obj_id].do_(lhpos,lvpos,ghpos,gvpos,p_stat);
							last_obj_id = obj_id;
							found_obj_id = obj_id;
							last_on_obj_id = obj_id;
							break;
						}
					}
				}
			}
			if ((found_obj_id == -1)&& (last_on_obj_id < MAX_SCR_OBJ))
			{
				so_obj[last_on_obj_id].leave(obj_id);
				last_on_obj_id = MAX_SCR_OBJ;
			}
			break;

		case PST_NOTFOUND :
			found_obj_id = -1;
			break;

		default : //PST_HOLD and PST_UP -> use last top layer
			if (last_obj_id != MAX_SCR_OBJ)
			{
				obj_id = last_obj_id;
				hmin = so_obj[obj_id].horigin;
				vmin = so_obj[obj_id].vorigin;
				hmax = so_obj[obj_id].horigin + so_obj[obj_id].hsize;
				vmax = so_obj[obj_id].vorigin + so_obj[obj_id].vsize;
				if (hmax > SCREEN_HSIZE - 1)
					hmax = SCREEN_HSIZE - 1;
				if (vmax > SCREEN_VSIZE - 1)
					vmax = SCREEN_VSIZE - 1;
				lhpos = ghpos - hmin; //this can be negative value!!!
				lvpos = gvpos - vmin; //this can be negative value!!!
				so_obj[obj_id].do_(lhpos,lvpos,ghpos,gvpos,p_stat);
				found_obj_id = last_obj_id;
			}

			if (p_stat == PST_UP)
			{
				last_obj_id = MAX_SCR_OBJ;	
			}
			break;
	}
	return (found_obj_id);
}

void ScrObjSetFocus(unsigned char obj_id)
{
	last_on_obj_id = obj_id;
}

void ScrObjInit(void (*first_screen_init_func)(void))
{
	screen_init_func = first_screen_init_func;
	screen_init_flag = 1;
}

void scr_obj_init(void)
{
	int i;

	for (i=0; i<MAX_SCR_OBJ; i++)
	{
		layer[i] = i;
		so_obj[i].stat = SO_ST_OFF;
		so_obj[i].is_white	= so_obj_is_white_null;
		so_obj[i].task100ms	= so_obj_task100ms_null;
		so_obj[i].up = so_obj_up_null;
		so_obj[i].leave	= so_obj_leave_null;
		so_obj[i].do_ = so_obj_do_null;
		so_obj[i].draw = so_obj_draw_null;
	}

	last_obj_id = MAX_SCR_OBJ;
	last_on_obj_id = MAX_SCR_OBJ;

	screen_init_func();

	ScrObjDraw();

	screen_init_flag = 0;
}

void ScrObjTask100ms(void)
{
	unsigned char i;
	if (screen_init_flag)
	{
	 	scr_obj_init();
	}
	for (i=0; i<MAX_SCR_OBJ; i++)
	{
		if (so_obj[i].stat != SO_ST_OFF)
			so_obj[i].task100ms();
	}
}