/*
 *	$Id$
 */

#include  <stdio.h>
#include  <stdlib.h>
#include  <x_sb_view.h>

#include  "x_sample_sb_view_lib.h"
#include  "x_arrow_data.h"


#define  TOP_MARGIN     14
#define  BOTTOM_MARGIN  14
#define  HEIGHT_MARGIN  (TOP_MARGIN + BOTTOM_MARGIN)
#define  WIDTH          13


/* --- static functions --- */

static void
get_geometry_hints(
	x_sb_view_t *  view ,
	unsigned int *  width ,
	unsigned int *  top_margin ,
	unsigned int *  bottom_margin ,
	int *  up_button_y ,
	unsigned int *  up_button_height ,
	int *  down_button_y ,
	unsigned int *  down_button_height
	)
{
	*width = WIDTH ;
	*top_margin = TOP_MARGIN ;
	*bottom_margin = BOTTOM_MARGIN ;
	*up_button_y = 0 ;
	*up_button_height = TOP_MARGIN ;
	*down_button_y = -BOTTOM_MARGIN ;
	*down_button_height = BOTTOM_MARGIN ;
}

static void
get_default_color(
	x_sb_view_t *  view ,
	char **  fg_color ,
	char **  bg_color
	)
{
	*fg_color = "gray" ;
	*bg_color = "lightgray" ;
}

static void
realized(
	x_sb_view_t *  view ,
	Display *  display ,
	int  screen ,
	Window  window ,
	GC  gc ,		/* is None in win32 */
	unsigned int  height
	)
{
	sample_sb_view_t *  sample ;

	sample = (sample_sb_view_t*) view ;
	
	view->display = display ;
	view->screen = screen ;
	view->window = window ;
	view->gc = gc ;
	view->height = height ;

	gc = GetDC(window) ;
	sample->gc = CreateCompatibleDC( gc) ;
	
	sample->arrow_up = x_get_icon_pixmap( view , gc , sample->gc , arrow_up_src ,
					WIDTH , TOP_MARGIN , 24 , 0 , 0) ;
	sample->arrow_down = x_get_icon_pixmap( view , gc , sample->gc , arrow_down_src ,
					WIDTH , BOTTOM_MARGIN , 24 , 0 , 0) ;
	sample->arrow_up_dent = x_get_icon_pixmap( view , gc , sample->gc , arrow_up_dent_src ,
					WIDTH , TOP_MARGIN , 24 , 0 , 0) ;
	sample->arrow_down_dent = x_get_icon_pixmap( view , gc , sample->gc , arrow_down_dent_src ,
					WIDTH , BOTTOM_MARGIN , 24 , 0 , 0) ;

	ReleaseDC( window , gc) ;
}

static void
resized(
	x_sb_view_t *  view ,
	Window  window ,
	unsigned int  height
	)
{
	view->window = window ;
	view->height = height ;
}

static void
color_changed(
	x_sb_view_t *  view ,
	int  is_fg		/* 1=fg , 0=bg */
	)
{
	if( is_fg)
	{
		sample_sb_view_t *  sample ;
		HPEN  pen ;
		
		sample = (sample_sb_view_t*) view ;

		pen = SelectObject( view->gc , GetStockObject(NULL_PEN)) ;
		SelectObject( sample->gc , pen) ;
		
		SelectObject( sample->gc , sample->arrow_up) ;
		x_draw_icon_pixmap_fg( view , sample->gc , arrow_up_src , WIDTH , TOP_MARGIN) ;
		
		SelectObject( sample->gc , sample->arrow_down) ;
		x_draw_icon_pixmap_fg( view , sample->gc , arrow_down_src ,
			WIDTH , BOTTOM_MARGIN) ;
		
		SelectObject( sample->gc , sample->arrow_up_dent) ;
		x_draw_icon_pixmap_fg( view , sample->gc , arrow_up_dent_src ,
			WIDTH , TOP_MARGIN) ;
		
		SelectObject( sample->gc , sample->arrow_down_dent) ;
		x_draw_icon_pixmap_fg( view , sample->gc , arrow_down_dent_src ,
			WIDTH , BOTTOM_MARGIN) ;

		SelectObject( view->gc , pen) ;
	}
}

static void
delete(
	x_sb_view_t *  view
	)
{
	sample_sb_view_t *  sample ;

	sample = (sample_sb_view_t*) view ;

	if( sample)
	{
		if( sample->gc)
		{
			DeleteDC( sample->gc) ;
			DeleteObject( sample->arrow_up) ;
			DeleteObject( sample->arrow_up_dent) ;
			DeleteObject( sample->arrow_down) ;
			DeleteObject( sample->arrow_down_dent) ;
		}
		
		free( sample) ;
	}
}

static void
draw_arrow_up_icon(
	x_sb_view_t *  view ,
	int  is_dent
	)
{
	sample_sb_view_t *  sample ;
	Pixmap  arrow ;

	sample = (sample_sb_view_t*) view ;

	if( is_dent)
	{
		arrow = sample->arrow_up_dent ;
	}
	else
	{
		arrow = sample->arrow_up ;
	}
	
	SelectObject( sample->gc , arrow) ;
	BitBlt( view->gc , 0 , 0 , WIDTH , TOP_MARGIN , sample->gc , 0 , 0 , SRCCOPY) ;
}

static void
draw_arrow_down_icon(
	x_sb_view_t *  view ,
	int  is_dent
	)
{
	sample_sb_view_t *  sample ;
	Pixmap  arrow ;

	sample = (sample_sb_view_t*) view ;

	if( is_dent)
	{
		arrow = sample->arrow_down_dent ;
	}
	else
	{
		arrow = sample->arrow_down ;
	}
	
	SelectObject( sample->gc , arrow) ;
	BitBlt( view->gc , 0 , view->height - BOTTOM_MARGIN , WIDTH , BOTTOM_MARGIN ,
		sample->gc , 0 , 0 , SRCCOPY) ;
}

static void
draw_scrollbar(
	x_sb_view_t *  view ,
	int  bar_top_y ,
	unsigned int  bar_height
	)
{
	HPEN  old_pen ;
	
	/* drawing bar */
	Rectangle( view->gc , 1 , bar_top_y , WIDTH , bar_top_y + bar_height) ;
	
	/* left side shade */
	old_pen = SelectObject( view->gc , GetStockObject( WHITE_PEN)) ;
	MoveToEx( view->gc , 0 , bar_top_y , NULL) ;
	LineTo( view->gc , 0 , bar_top_y + bar_height) ;

	/* up side shade */
	MoveToEx( view->gc , 0 , bar_top_y , NULL) ;
	LineTo( view->gc , WIDTH - 1 , bar_top_y) ;

	/* right side shade */
	SelectObject( view->gc , GetStockObject( BLACK_PEN)) ;
	MoveToEx( view->gc , WIDTH - 1 , bar_top_y , NULL) ;
	LineTo( view->gc , WIDTH - 1 , bar_top_y + bar_height - 1) ;

	/* down side shade */
	MoveToEx( view->gc , 1 , bar_top_y + bar_height - 1, NULL) ;
	LineTo( view->gc , WIDTH , bar_top_y + bar_height - 1) ;

	SelectObject( view->gc , old_pen) ;
}

static void
draw_background(
	x_sb_view_t *  view ,
	int  y ,
	unsigned int  height
	)
{
	/* XXX Garbage is left in screen in scrolling without +1. Related to NULL_PEN ? */
	Rectangle( view->gc , 0 , y , WIDTH + 1 , y + height + 1) ;
}

static void
draw_up_button(
	x_sb_view_t *  view ,
	int  is_pressed
	)
{
	draw_arrow_up_icon( view , is_pressed) ;
}

static void
draw_down_button(
	x_sb_view_t *  view ,
	int  is_pressed
	)
{
	draw_arrow_down_icon( view , is_pressed) ;
}


/* --- global functions --- */

x_sb_view_t *
x_sample_sb_view_new(void)
{
	sample_sb_view_t *  sample ;
	
	if( ( sample = calloc( 1 , sizeof( sample_sb_view_t))) == NULL)
	{
		return  NULL ;
	}

	sample->view.version = 1 ;

	sample->view.get_geometry_hints = get_geometry_hints ;
	sample->view.get_default_color = get_default_color ;
	sample->view.realized = realized ;
	sample->view.resized = resized ;
	sample->view.color_changed = color_changed ;
	sample->view.delete = delete ;

	sample->view.draw_scrollbar = draw_scrollbar ;
	sample->view.draw_background = draw_background ;
	sample->view.draw_up_button = draw_up_button ;
	sample->view.draw_down_button = draw_down_button ;

	return  (x_sb_view_t*) sample ;
}
