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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Components project.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qtexclusivegroup_p.h"
#include <QtCore/QVariant>
#include <QtCore/qdebug.h>
#define CHECKED_PROPERTY "checked"
QT_BEGIN_NAMESPACE
static const char *checkableSignals[] = {
CHECKED_PROPERTY"Changed()",
"toggled(bool)",
"toggled()",
0
};
static bool isChecked(const QObject *o)
{
if (!o) return false;
QVariant checkedVariant = o->property(CHECKED_PROPERTY);
return checkedVariant.isValid() && checkedVariant.toBool();
}
/*!
\qmltype ExclusiveGroup
\instantiates QtExclusiveGroup
\inqmlmodule QtQuick.Controls 1.0
\ingroup containers
\brief ExclusiveGroup provides a way to declare several checkable controls as mutually exclusive.
\code
ExclusiveGroup { id: radioInputGroup }
Action {
id: dabRadioInput
text: "DAB"
exclusiveGroup: radioInputGroup
}
Action {
id: fmRadioInput
text: "FM"
exclusiveGroup: radioInputGroup
}
Action {
id: amRadioInput
text: "AM"
exclusiveGroup: radioInputGroup
}
\endcode
For an object, or control, to be compatible with \c ExclusiveGroup, it should have a \c checked
property, and either a \c checkedChanged, \c toggled(), or \c toggled(bool) signal. It also needs
to be registered with \c ExclusiveGroup::registerCheckable(object) when its \c ExclusiveGroup property is set.
\sa Action, ButtonBehavior
*/
/*!
\qmlproperty QtObject ExclusiveGroup::current
The currently selected object.
*/
/*!
\qmlmethod void ExclusiveGroup::registerCheckable(object)
Register \c object to the exclusive group.
You should only need to call this function when creating a component you want to be compatible with \c ExclusiveGroup.
\sa ExclusiveGroup::unregisterCheckable(object)
*/
/*!
\qmlmethod void ExclusiveGroup::unregisterCheckable(object)
Unregister \c object from the exclusive group.
You should only need to call this function when creating a component you want to be compatible with \c ExclusiveGroup.
\sa ExclusiveGroup::registerCheckable(object)
*/
QtExclusiveGroup::QtExclusiveGroup(QObject *parent)
: QObject(parent)
{
int index = metaObject()->indexOfMethod("updateCurrent()");
m_updateCurrentMethod = metaObject()->method(index);
}
void QtExclusiveGroup::setCurrent(QObject * o)
{
if (m_current == o)
return;
if (m_current)
m_current->setProperty(CHECKED_PROPERTY, QVariant(false));
m_current = o;
if (m_current)
m_current->setProperty(CHECKED_PROPERTY, QVariant(true));
emit currentChanged();
}
void QtExclusiveGroup::updateCurrent()
{
QObject *checkable = sender();
if (isChecked(checkable))
setCurrent(checkable);
}
void QtExclusiveGroup::registerCheckable(QObject *o)
{
for (const char **signalName = checkableSignals; *signalName; signalName++) {
int signalIndex = o->metaObject()->indexOfSignal(*signalName);
if (signalIndex != -1) {
QMetaMethod signalMethod = o->metaObject()->method(signalIndex);
connect(o, signalMethod, this, m_updateCurrentMethod, Qt::UniqueConnection);
connect(o, SIGNAL(destroyed(QObject*)), this, SLOT(unregisterCheckable(QObject*)), Qt::UniqueConnection);
if (!m_current && isChecked(o))
setCurrent(o);
return;
}
}
qWarning() << "QtExclusiveGroup::registerCheckable(): Cannot register" << o;
}
void QtExclusiveGroup::unregisterCheckable(QObject *o)
{
for (const char **signalName = checkableSignals; *signalName; signalName++) {
int signalIndex = o->metaObject()->indexOfSignal(*signalName);
if (signalIndex != -1) {
QMetaMethod signalMethod = o->metaObject()->method(signalIndex);
if (disconnect(o, signalMethod, this, m_updateCurrentMethod)) {
disconnect(o, SIGNAL(destroyed(QObject*)), this, SLOT(unregisterCheckable(QObject*)));
break;
}
}
}
}
QT_END_NAMESPACE
|
