/*
   ui/listview.cc
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#include "ui/listview.h"

namespace ui
{

ListView::ListView(Widget *parent) : Widget(parent)
{
	set_label("listview");
	set_border(true);
}

ListView::~ListView()
{
}

void ListView::set_scroll(float scroll)
{
	listview_scroll = scroll;
	if (listview_scroll < 0)
		listview_scroll = 0;
	
	// calculate maximal scroll size
	float top = 0;
	for (Children::iterator it = children().begin(); it != children().end(); it++) {		
		top += (*it)->height();
	}
	if (listview_scroll > top) listview_scroll = top;
}

void ListView::inc_scroll(float scroll)
{
	set_scroll(listview_scroll + scroll);
}

void ListView::dec_scroll(float scroll)
{
	set_scroll(listview_scroll - scroll);
}
	
void ListView::resize()
{
	float content_top = 0;
	
	// reposition all children within the container
	for (Children::iterator it = children().begin(); it != children().end(); it++) {
		(*it)->set_width(width());
		if (content_top - listview_scroll < 0) {
			// child widget is invisible
			(*it)->hide();
		} else if ((content_top - listview_scroll) >= height()) {
			// child widget is invisible
			(*it)->hide();
		} else {
			(*it)->show();
			(*it)->set_location(0, content_top - listview_scroll);
		}
		
		content_top += (*it)->height();
	}
}
	
}