/*
 *  label.cpp  -  label with radiobutton buddy option
 *  Program:  kalarm
 *  Copyright (c) 2004, 2005 by David Jarvie <software@astrojar.org.uk>
 *
 *  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.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include "kalarm.h"
#include <QRadioButton>
#include "label.moc"


Label::Label(QWidget* parent, Qt::WFlags f)
	: QLabel(parent, f),
	  mRadioButton(0),
	  mFocusWidget(0)
{ }

Label::Label(const QString& text, QWidget* parent, Qt::WFlags f)
	: QLabel(text, parent, f),
	  mRadioButton(0),
	  mFocusWidget(0)
{ }

Label::Label(QWidget* buddy, const QString& text, QWidget* parent, Qt::WFlags f)
	: QLabel(text, parent, f),
	  mRadioButton(0),
	  mFocusWidget(0)
{
	setBuddy(buddy);
}

/******************************************************************************
* Set a buddy widget.
* If it (or its focus proxy) is a radio button, create a focus widget.
* When the accelerator key is pressed, the focus widget then receives focus.
* That event triggers the selection of the radio button.
*/
void Label::setBuddy(QWidget* bud)
{
	if (mRadioButton)
		disconnect(mRadioButton, SIGNAL(destroyed()), this, SLOT(buddyDead()));
	QWidget* w = bud;
	if (w)
	{
		while (w->focusProxy())
			w = w->focusProxy();
		if (!qobject_cast<QRadioButton*>(w))
			w = 0;
	}
	if (!w)
	{
		// The buddy widget isn't a radio button
		QLabel::setBuddy(bud);
		delete mFocusWidget;
		mFocusWidget = 0;
		mRadioButton = 0;
	}
	else
	{
		// The buddy widget is a radio button, so set a different buddy
		if (!mFocusWidget)
			mFocusWidget = new LabelFocusWidget(this);
		QLabel::setBuddy(mFocusWidget);
		mRadioButton = (QRadioButton*)bud;
		connect(mRadioButton, SIGNAL(destroyed()), this, SLOT(buddyDead()));
	}
}

void Label::buddyDead()
{
	delete mFocusWidget;
	mFocusWidget = 0;
	mRadioButton = 0;
}

/******************************************************************************
* Called when focus is transferred to the label's special focus widget.
* Transfer focus to the radio button and select it.
*/
void Label::activated()
{
	if (mFocusWidget  &&  mRadioButton)
	{
		mRadioButton->setFocus();
		mRadioButton->setChecked(true);
	}
}


/*=============================================================================
* Class: LabelFocusWidget
=============================================================================*/

LabelFocusWidget::LabelFocusWidget(QWidget* parent)
	: QWidget(parent)
{
	setFocusPolicy(Qt::ClickFocus);
	setFixedSize(QSize(1,1));
}

void LabelFocusWidget::focusInEvent(QFocusEvent*)
{
	Label* parent = (Label*)parentWidget();
	parent->activated();

}
