#include "PostPre.h"
#include "PostWin.h"
#include "Global.h"

void	do_blit(void)
{
	blit_to_window = FALSE;
	while(!AttemptLockLayerRom(OutputWnd->WLayer)) Delay(1);
	BltBitMapRastPort(&bitmap, winxpos, winypos,
						OutputWnd->RPort, winxbase,
						winybase, winxsize, winysize, 0xC0);
	WaitBlit();
	UnlockLayerRom(OutputWnd->WLayer);
	blit_to_window = TRUE;
}

void	set_scrollers(void)
{
	UWORD	hidden, vertpot, vertbody, horizpot, horizbody;

	hidden = max(parm.page.xsize - winxsize, 0);
	if(winxpos > hidden) winxpos = hidden;
	if(hidden > 0)
	{
		horizbody = (UWORD) (((ULONG) winxsize * MAXBODY) / (parm.page.xsize));
		horizpot = (UWORD) (((ULONG) winxpos * MAXBODY) / hidden);
	}
	else
	{
		horizbody = MAXBODY;
		horizpot = 0;
	}
	hidden = max(parm.page.ysize - winysize, 0);
	if(winypos > hidden) winypos = hidden;
	if(hidden > 0)
	{
		vertbody = (UWORD) (((ULONG) winysize * MAXBODY) / (parm.page.ysize));
		vertpot = (UWORD) (((ULONG) winypos * MAXBODY) / hidden);
	}
	else
	{
		vertbody = MAXBODY;
		vertpot = 0;
	}
	NewModifyProp(&hscrollgadg, OutputWnd, NULL,
		AUTOKNOB | FREEHORIZ | PROPNEWLOOK | PROPBORDERLESS,
		horizpot, -1, horizbody, -1, 1);
	NewModifyProp(&vscrollgadg, OutputWnd, NULL,
		AUTOKNOB | FREEVERT | PROPNEWLOOK | PROPBORDERLESS,
		-1, vertpot, -1, vertbody, 1);
}

void	get_scrollers(void)
{
	UWORD	hidden;

	hidden = max(parm.page.xsize - winxsize, 0);
	winxpos = (((ULONG) hidden * hscrollinfo.HorizPot) + (MAXPOT/2)) / MAXPOT;
	hidden = max(parm.page.ysize  - winysize, 0);
	winypos = (((ULONG) hidden * vscrollinfo.VertPot) + (MAXPOT/2)) / MAXPOT;
}



void	do_gadgets(int gad_num, int incr)
{
	BOOL	blit = FALSE, change_scroller = TRUE;

	switch(gad_num)
	{
		case HORIZ_SCROLLER:
		case VERT_SCROLLER:
			get_scrollers();
			change_scroller = FALSE;
			blit = TRUE;
			break;

		case GAD_LEFT:
			if(winxpos > 0)
			{
				winxpos -= incr;
				if(winxpos < 0) winxpos = 0;
				blit = TRUE;
			}
			break;

		case GAD_RIGHT:
			if(winxpos <  parm.page.xsize - winxsize)
			{
				winxpos += incr;
				if(winxpos > parm.page.xsize - winxsize) winxpos = parm.page.xsize - winxsize;
				blit = TRUE;
			}
			break;

		case GAD_UP:
			if(winypos > 0)
			{
				winypos -= incr;
				if(winypos < 0) winypos = 0;
				blit = TRUE;
			}
			break;

		case GAD_DOWN:
			if(winypos <  parm.page.ysize - winysize)
			{
				winypos += incr;
				if(winypos > parm.page.ysize - winysize) winypos = parm.page.ysize - winysize;
				blit = TRUE;
			}
			break;

		default:
			blit = FALSE;
			change_scroller = FALSE;
			break;
	}
	if(blit)
	{
		if(change_scroller) set_scrollers();
		do_blit();
	}
}

int	nextpage(void)
{
	if(running && paused)
	{
		Signal((struct Task *) rendertask, 1L << pause_signal);
		if(number_of_pages)
		{
			page_number++;
			sendmenu(PSACTPAUSE, number_of_pages, page_number, 0, NULL, NULL);
		}
		return(0);
	}
	else return(STR_ID_PAUSED);
}

int	previouspage(void)
{
	if(running && paused)
	{
		if(number_of_pages)
		{
			if(page_number > 1)
			{
				page_number--;
				Signal((struct Task *) rendertask, 1L << pause_signal);
				sendmenu(PSACTPAUSE, number_of_pages, page_number, 0, NULL, NULL);
				return(0);
			}
			else
			{
				return(STR_ID_PAGE_FIRST);
			}
		}
		else
		{
			return(STR_ID_PSFILE);
		}
	}
	else
	{
		return(STR_ID_PAUSED);
	}
}

int	gotopage(int next_page_number)
{
	if(page_number != next_page_number)
	{
		Signal((struct Task *) rendertask, 1L << pause_signal);
		page_number = next_page_number;
		sendmenu(PSACTPAUSE, number_of_pages, page_number, 0, NULL, NULL);
		return(0);
	}
	else return(STR_ID_PAGE_OK);
}