/*
 *  Copyright (c) 2004 Adrian Page <adrian@pagenet.plus.com>
 *
 *  This program 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 program 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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <kaction.h>
#include <klocale.h>

#include "kis_canvas_controller.h"
#include "kis_canvas_subject.h"
#include "kis_cursor.h"
#include "kis_tool_pan.h"
#include "kis_button_press_event.h"
#include "kis_button_release_event.h"
#include "kis_move_event.h"

KisToolPan::KisToolPan()
{
	setName("tool_pan");
	m_subject = 0;
	m_dragging = false;
	m_openHandCursor = KisCursor::openHandCursor();
	m_closedHandCursor = KisCursor::closedHandCursor();
	setCursor(m_openHandCursor);
}

KisToolPan::~KisToolPan()
{
}

void KisToolPan::update(KisCanvasSubject *subject)
{
	m_subject = subject;
	super::update(m_subject);
}

void KisToolPan::buttonPress(KisButtonPressEvent *e)
{
	if (m_subject && !m_dragging && e -> button() == Qt::LeftButton) {
		KisCanvasControllerInterface *controller = m_subject -> canvasController();

		m_origScrollX = controller -> horzValue();
		m_origScrollY = controller -> vertValue();
		m_dragPos = controller -> windowToView(e -> pos());
		m_dragging = true;
		setCursor(m_closedHandCursor);
	}
}

void KisToolPan::move(KisMoveEvent *e)
{
	if (m_subject && m_dragging) {
		KisCanvasControllerInterface *controller = m_subject -> canvasController();

		KisPoint currPos = controller -> windowToView(e -> pos());
		KisPoint delta = currPos - m_dragPos;
		controller -> scrollTo(m_origScrollX - delta.floorX(), m_origScrollY - delta.floorY());
	}
}

void KisToolPan::buttonRelease(KisButtonReleaseEvent *e)
{
	if (m_subject && m_dragging && e -> button() == Qt::LeftButton) {
		KisCanvasControllerInterface *controller = m_subject -> canvasController();
		setCursor(m_openHandCursor);
		m_dragging = false;
	}
}

void KisToolPan::setup(KActionCollection *collection)
{
	m_action = static_cast<KRadioAction *>(collection -> action(name()));

	if (m_action == 0) {
		m_action = new KRadioAction(i18n("Tool &Pan"), "tool_pan", Qt::SHIFT+Qt::Key_H, this, SLOT(activate()), collection, name());
		m_action -> setExclusiveGroup("tools");
		m_ownAction = true;
	}
}

#include "kis_tool_pan.moc"

