descent/UI/LISTBOX.C

/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.  
COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
*/
/*
 * $Source: f:/miner/source/ui/rcs/listbox.c $
 * $Revision: 1.5 $
 * $Author: john $
 * $Date: 1994/11/18 23:07:32 $
 *
 * Routines for doing listbox gadgets.
 *
 * $Log: listbox.c $
 * Revision 1.5  1994/11/18  23:07:32  john
 * Changed a bunch of shorts to ints.
 * 
 * Revision 1.4  1993/12/07  12:31:02  john
 * new version.
 * 
 * Revision 1.3  1993/10/26  13:46:16  john
 * *** empty log message ***
 * 
 * Revision 1.2  1993/10/05  17:30:15  john
 * *** empty log message ***
 * 
 * Revision 1.1  1993/09/20  10:34:45  john
 * Initial revision
 * 
 *
 */

#pragma off (unreferenced)
static char rcsid[] = "$Id: listbox.c 1.5 1994/11/18 23:07:32 john Exp $";
#pragma on (unreferenced)
#include <stdlib.h>

#include "fix.h"
#include "types.h"
#include "gr.h"
#include "ui.h"
#include "key.h"

#define TICKER (*(volatile int *)0x46C)

void ui_draw_listbox( UI_GADGET_LISTBOX * listbox )
{
	int i, x, y, stop;
	int w, h,  aw;

	//if (listbox->current_item<0)
	//    listbox->current_item=0;
	//if (listbox->current_item>=listbox->num_items)
	//    listbox->current_item = listbox->num_items-1;
	//if (listbox->first_item<0)
	//   listbox->first_item=0;
	//if (listbox->first_item>(listbox->num_items-listbox->num_items_displayed))
	//    listbox->first_item=(listbox->num_items-listbox->num_items_displayed);

	if ((listbox->status!=1) && !listbox->moved )
		return;

	stop = listbox->first_item+listbox->num_items_displayed;
	if (stop>listbox->num_items) stop = listbox->num_items;

	listbox->status = 0;

	x = y = 0;
	ui_mouse_hide();
	gr_set_current_canvas( listbox->canvas );

	for (i= listbox->first_item; i< stop; i++ )
	{
		if (i !=listbox->current_item)
		{
			if ((listbox->current_item == -1) && (CurWindow->keyboard_focus_gadget == (UI_GADGET *)listbox) && (i == listbox->first_item)  )
				gr_set_fontcolor( CRED, CBLACK );
			else
				gr_set_fontcolor( CWHITE, CBLACK );
		}
		else
		{
			if (CurWindow->keyboard_focus_gadget == (UI_GADGET *)listbox)
				gr_set_fontcolor( CRED, CGREY );
			else
				gr_set_fontcolor( CBLACK, CGREY );
		}
		gr_string( x+2, y, listbox->list+i*listbox->text_width );
		gr_get_string_size(listbox->list+i*listbox->text_width, &w, &h,&aw );

		if (i==listbox->current_item)
			gr_setcolor( CGREY );
		else
			gr_setcolor( CBLACK );

		gr_rect( x+w+2, y, listbox->width-1, y+h-1 );
		gr_rect( x, y, x+1, y+h-1 );

		y += h;
	}

	if (stop < listbox->num_items_displayed-1 )
	{
		gr_setcolor(CBLACK);
		gr_rect( x, y, listbox->width-1, listbox->height-1 );
	}

	//gr_ubox( -1, -1, listbox->width, listbox->height);
	ui_mouse_show();

}


void gr_draw_sunken_border( short x1, short y1, short x2, short y2 )
{

	gr_setcolor( CGREY );
	Hline( x1-1, x2+1, y1-1);
	Vline( y1-1, y2+1, x1-1);

	gr_setcolor( CBRIGHT );
	Hline( x1-1, x2+1, y2+1);
	Vline( y1, y2+1, x2+1);

}


UI_GADGET_LISTBOX * ui_add_gadget_listbox( UI_WINDOW * wnd, short x, short y, short w, short h, short numitems, char * list, int text_width )
{
	int tw, th, taw, i;

	UI_GADGET_LISTBOX * listbox;

	gr_get_string_size("*", &tw, &th, &taw );

	i = h / th;
	h = i * th;

	listbox = (UI_GADGET_LISTBOX *)ui_gadget_add( wnd, 2, x, y, x+w-1, y+h-1 );

	listbox->list = list;
	listbox->text_width = text_width;
	listbox->width = w;
	listbox->height = h;
	listbox->num_items = numitems;
	listbox->num_items_displayed = i;
	listbox->first_item = 0;
	listbox->current_item = -1;
	listbox->last_scrolled = 0;
	listbox->textheight = th;
	listbox->dragging = 0;
	listbox->selected_item = -1;
	listbox->moved = 1;

	listbox->scrollbar = ui_add_gadget_scrollbar( wnd, x+w+3, y, 0, h, 0, numitems-i, 0, i );
	listbox->scrollbar->parent = (UI_GADGET *)listbox;

	gr_set_current_canvas( listbox->canvas );

	gr_setcolor(CBLACK);
	gr_rect( 0, 0, w-1, h-1);

	gr_draw_sunken_border( -2, -2, w+listbox->scrollbar->width+4, h+1);

	return listbox;

}

void ui_listbox_do( UI_GADGET_LISTBOX * listbox, int keypress )
{
	int OnMe, mitem, oldfakepos, kf;

	listbox->selected_item = -1;

	listbox->moved = 0;

	if (listbox->num_items < 1 ) {
		listbox->current_item = -1;
		listbox->first_item = 0;
		listbox->old_current_item = listbox->current_item;
		listbox->old_first_item = listbox->first_item;
		ui_draw_listbox( listbox );

		if (CurWindow->keyboard_focus_gadget == (UI_GADGET *)listbox)
		{
			CurWindow->keyboard_focus_gadget = ui_gadget_get_next((UI_GADGET *)listbox);
		}

		return;
	}

	listbox->old_current_item = listbox->current_item;
	listbox->old_first_item = listbox->first_item;

	OnMe = ui_mouse_on_gadget( (UI_GADGET *)listbox );


	if (listbox->scrollbar->moved )
	{
		listbox->moved = 1;

		listbox->first_item = listbox->scrollbar->position;

		if (listbox->current_item<listbox->first_item)
			listbox->current_item = listbox->first_item;

		if (listbox->current_item>(listbox->first_item+listbox->num_items_displayed-1))
			listbox->current_item = listbox->first_item + listbox->num_items_displayed-1;

	}

	if (!B1_PRESSED )
		listbox->dragging = 0;

	if (B1_PRESSED && OnMe )
		listbox->dragging = 1;

	if ( CurWindow->keyboard_focus_gadget==(UI_GADGET *)listbox )
	{
		if (keypress==KEY_ENTER)   {
			listbox->selected_item = listbox->current_item;
		}

		kf = 0;

		switch(keypress)
		{
			case (KEY_UP):
				listbox->current_item--;
				kf = 1;
				break;
			case (KEY_DOWN):
				listbox->current_item++;
				kf = 1;
				break;
			case (KEY_HOME):
				listbox->current_item=0;
				kf = 1;
				break;
			case (KEY_END):
				listbox->current_item=listbox->num_items-1;
				kf = 1;
				break;
			case (KEY_PAGEUP):
				listbox->current_item -= listbox->num_items_displayed;
				kf = 1;
				break;
			case (KEY_PAGEDOWN):
				listbox->current_item += listbox->num_items_displayed;
				kf = 1;
				break;
		}

		if (kf==1)
		{
			listbox->moved = 1;

			if (listbox->current_item<0)
				listbox->current_item=0;

			if (listbox->current_item>=listbox->num_items)
				listbox->current_item = listbox->num_items-1;

			if (listbox->current_item<listbox->first_item)
				listbox->first_item = listbox->current_item;

			if (listbox->current_item>=(listbox->first_item+listbox->num_items_displayed))
				listbox->first_item = listbox->current_item-listbox->num_items_displayed+1;

			if (listbox->num_items <= listbox->num_items_displayed )
				listbox->first_item = 0;
			else
			{
				oldfakepos = listbox->scrollbar->position;
				listbox->scrollbar->position = listbox->first_item;

				listbox->scrollbar->fake_position = listbox->scrollbar->position-listbox->scrollbar->start;
				listbox->scrollbar->fake_position *= listbox->scrollbar->height-listbox->scrollbar->fake_size;
				listbox->scrollbar->fake_position /= (listbox->scrollbar->stop-listbox->scrollbar->start);

				if (listbox->scrollbar->fake_position<0)
				{
					listbox->scrollbar->fake_position = 0;
				}
				if (listbox->scrollbar->fake_position > (listbox->scrollbar->height-listbox->scrollbar->fake_size))
				{
					listbox->scrollbar->fake_position = (listbox->scrollbar->height-listbox->scrollbar->fake_size);
				}

				if (oldfakepos != listbox->scrollbar->position )
					listbox->scrollbar->status = 1;
			}
		}
	}


	if (selected_gadget==(UI_GADGET *)listbox)
	{
		if (B1_PRESSED && listbox->dragging)
		{
			if (Mouse.y < listbox->y1)
				mitem = -1;
			else
				mitem = (Mouse.y - listbox->y1)/listbox->textheight;

			if  ( (mitem < 0 ) && ( TICKER > listbox->last_scrolled+1) )
			{
				listbox->current_item--;
				listbox->last_scrolled = TICKER;
				listbox->moved = 1;
			}

			if ( ( mitem >= listbox->num_items_displayed ) &&
				 ( TICKER > listbox->last_scrolled+1)         )
			{
				listbox->current_item++;
				listbox->last_scrolled = TICKER;
				listbox->moved = 1;
			}

			if ((mitem>=0) && (mitem<listbox->num_items_displayed))
			{
				listbox->current_item = mitem+listbox->first_item;
				listbox->moved=1;
			}

			if (listbox->current_item <0 )
				listbox->current_item = 0;

			if (listbox->current_item >= listbox->num_items )
				listbox->current_item = listbox->num_items-1;

			if (listbox->current_item<listbox->first_item)
				listbox->first_item = listbox->current_item;

			if (listbox->current_item>=(listbox->first_item+listbox->num_items_displayed))
				listbox->first_item = listbox->current_item-listbox->num_items_displayed+1;

			if (listbox->num_items <= listbox->num_items_displayed )
				listbox->first_item = 0;
			else
			{
				oldfakepos = listbox->scrollbar->position;
				listbox->scrollbar->position = listbox->first_item;

				listbox->scrollbar->fake_position = listbox->scrollbar->position-listbox->scrollbar->start;
				listbox->scrollbar->fake_position *= listbox->scrollbar->height-listbox->scrollbar->fake_size;
				listbox->scrollbar->fake_position /= (listbox->scrollbar->stop-listbox->scrollbar->start);

				if (listbox->scrollbar->fake_position<0)
				{
					listbox->scrollbar->fake_position = 0;
				}
				if (listbox->scrollbar->fake_position > (listbox->scrollbar->height-listbox->scrollbar->fake_size))
				{
					listbox->scrollbar->fake_position = (listbox->scrollbar->height-listbox->scrollbar->fake_size);
				}

				if (oldfakepos != listbox->scrollbar->position )
					listbox->scrollbar->status = 1;
			}

		}

		if (B1_DOUBLE_CLICKED )
		{
			listbox->selected_item = listbox->current_item;
		}

	}

	ui_draw_listbox( listbox );

}

void ui_listbox_change( UI_WINDOW * wnd, UI_GADGET_LISTBOX * listbox, short numitems, char * list, int text_width )
{
	int stop, start;
	UI_GADGET_SCROLLBAR * scrollbar;

	wnd = wnd;

	listbox->list = list;
	listbox->text_width = text_width;
	listbox->num_items = numitems;
	listbox->first_item = 0;
	listbox->current_item = -1;
	listbox->last_scrolled = TICKER;
	listbox->dragging = 0;
	listbox->selected_item = -1;
	listbox->status = 1;
	listbox->first_item = 0;
	listbox->current_item = listbox->old_current_item = 0;
	listbox->moved = 0;

	scrollbar = listbox->scrollbar;

	start=0;
	stop= numitems - listbox->num_items_displayed;

	if (stop < start) stop = start;

	scrollbar->horz = 0;
	scrollbar->start = start;
	scrollbar->stop = stop;
	scrollbar->fake_length = scrollbar->height;
	scrollbar->fake_position =  0;
	if (stop!=start)
		scrollbar->fake_size = (listbox->num_items_displayed * scrollbar->height)/(stop-start+1+listbox->num_items_displayed);
	else
		scrollbar->fake_size = scrollbar->height;

	if (scrollbar->fake_size < 7) scrollbar->fake_size = 7;
	scrollbar->dragging = 0;
	scrollbar->moved=0;
	scrollbar->status=1;


}