/* === S Y N F I G ========================================================= */

/*!	\file helpers.cpp

**	\brief Helpers File

**

**	$Id$

**

**	\legal

**	......... ... 2018 Ivan Mahonin

**

**	This package is free software; you can redistribute it and/or

**	modify it under the terms of the GNU General Public License as

**	published by the Free Software Foundation; either version 2 of

**	the License, or (at your option) any later version.

**

**	This package is distributed in the hope that it will be useful,

**	but WITHOUT ANY WARRANTY; without even the implied warranty of

**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

**	General Public License for more details.

**	\endlegal

*/

/* ========================================================================= */

/* === H E A D E R S ======================================================= */

#ifdef USING_PCH

#	include "pch.h"

#else

#ifdef HAVE_CONFIG_H

#	include <config.h></config.h>

#endif

#include <gtk gtk.h=""></gtk>

#include <glibmm main.h=""></glibmm>

#include <synfig general.h=""></synfig>

#include "helpers.h"

#include <gui localization.h=""></gui>

#endif

/* === U S I N G =========================================================== */

using namespace synfig;

using namespace studio;

/* === M A C R O S ========================================================= */

/* === G L O B A L S ======================================================= */

/* === P R O C E D U R E S ================================================= */

static bool

is_old_gtk_adjustment() {

	static bool is_old = gtk_check_version(3, 18, 0) != NULL;

	return is_old;

}

/* === M E T H O D S ======================================================= */

AdjustmentGroup::AdjustmentGroup():

	lock() { }

AdjustmentGroup::~AdjustmentGroup()

{

	for(std::list<item>::iterator i = items.begin(); i != items.end(); ++i) {</item>

		i->connection_changed.disconnect();

		i->connection_value_changed.disconnect();

	}

	connection_timeout.disconnect();

}

void AdjustmentGroup::add(Glib::RefPtr<gtk::adjustment> adjustment)</gtk::adjustment>

{

	for(std::list<item>::iterator i = items.begin(); i != items.end(); ++i)</item>

		if (i->adjustment == adjustment) return;

	items.push_back(Item());

	Item &item = items.back();

	item.adjustment = adjustment;

	item.connection_changed = item.adjustment->signal_changed().connect(

		sigc::bind( sigc::mem_fun(this, &AdjustmentGroup::changed), adjustment ) );

	item.connection_value_changed = item.adjustment->signal_value_changed().connect(

		sigc::bind( sigc::mem_fun(this, &AdjustmentGroup::changed), adjustment ) );

	changed( adjustment );

}

void AdjustmentGroup::remove(Glib::RefPtr<gtk::adjustment> adjustment)</gtk::adjustment>

{

	bool found = false;

	for(std::list<item>::iterator i = items.begin(); i != items.end(); )</item>

		if (i->adjustment == adjustment) {

			i->connection_changed.disconnect();

			i->connection_value_changed.disconnect();

			i = items.erase(i);

			found = true;

		} else ++i;

	if (found) changed(adjustment);

}

void

AdjustmentGroup::changed(Glib::RefPtr<gtk::adjustment> adjustment)</gtk::adjustment>

{

	if (lock || items.empty()) return;

	double position = items.front().adjustment->get_value();

	double maxSize = 0;

	for(std::list<item>::iterator i = items.begin(); i != items.end(); ++i) {</item>

		if (i->adjustment == adjustment) {

			i->origSize = i->adjustment->get_upper()

			            - i->adjustment->get_page_size();

			position = i->adjustment->get_value();

		}

		maxSize = std::max(maxSize, i->origSize);

	}

	connection_timeout.disconnect();

	connection_timeout = Glib::signal_timeout().connect(

		sigc::bind_return(

			sigc::bind( sigc::mem_fun(this, &AdjustmentGroup::set), position, maxSize ),

			false ),

		0 );

}

void

AdjustmentGroup::set(double position, double size)

{

	BoolLock boollock(lock);

	connection_timeout.disconnect();

	for(std::list<item>::iterator i = items.begin(); i != items.end(); ++i) {</item>

		double value = i->adjustment->get_value();

		double page = i->adjustment->get_page_size();

		double upper = i->adjustment->get_upper();

		double newUpper = size + page;

		if (fabs(newUpper - upper) > 0.1)

			i->adjustment->set_upper(newUpper);

		if (fabs(position - value) > 0.1)

			i->adjustment->set_value(position);

	}

};

void

ConfigureAdjustment::emit_changed()

	{ if (is_old_gtk_adjustment()) adjustment->changed(); }

void

ConfigureAdjustment::emit_value_changed()

{ if (is_old_gtk_adjustment()) adjustment->value_changed(); }