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/*
* Copyright 2016 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; version 3.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "exclusivegroup_p.h"
#include <QtCore/QSignalMapper>
#include "ucaction_p.h"
#define CHECKED_PROPERTY "checked"
UT_NAMESPACE_BEGIN
static const char *checkableSignals[] = {
"toggled(bool)",
0
};
static bool isChecked(const QObject *o)
{
if (!o) return false;
QVariant checkedVariant = o->property(CHECKED_PROPERTY);
return checkedVariant.isValid() && checkedVariant.toBool();
}
/*!
* \qmltype ExclusiveGroup
* \inqmlmodule Lomiri.Components
* \since Lomiri.Components 1.3
* \ingroup lomiri
* \inherits ActionList
* \brief ExclusiveGroup provides a way to declare several checkable controls as mutually exclusive.
*
* The ExclusiveGroup will only allow a single object to have it's checkable property set to "true"
* at any one time. The exclusive group accepts child Actions, but objects other than Actions can be
* used by using the \l bindCheckable function as long as they support one of the required signals,
* and a "checked" property.
* \qml
* ExclusiveGroup {
* Action {
* parameterType: Action.Bool
* state: true
* }
* Action {
* parameterType: Action.Bool
* state: false
* }
* }
* \endqml
*/
ExclusiveGroup::ExclusiveGroup(QObject *parent)
: ActionList(parent)
, m_signalMapper(new QSignalMapper(this))
, m_entranceGuard(false)
{
connect(this, &ActionList::added, this, &ExclusiveGroup::onActionAdded);
connect(this, &ActionList::removed, this, &ExclusiveGroup::onActionRemoved);
int index = m_signalMapper->metaObject()->indexOfMethod("map()");
m_updateCurrentMethod = m_signalMapper->metaObject()->method(index);
#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
connect(m_signalMapper, static_cast<void(QSignalMapper::*)(QObject *)>(&QSignalMapper::mapped), this, [this](QObject *object) {
#else
connect(m_signalMapper, static_cast<void(QSignalMapper::*)(QObject *)>(&QSignalMapper::mappedObject), this, [this](QObject *object) {
#endif
if (isChecked(object)) {
setCurrent(object);
}
});
}
void ExclusiveGroup::onActionAdded(UCAction *action)
{
action->setExclusiveGroup(this);
}
void ExclusiveGroup::onActionRemoved(UCAction *action)
{
action->setExclusiveGroup(nullptr);
}
/*!
* \qmlproperty Action ExclusiveGroup::current
* Returns the currently checked action
*/
void ExclusiveGroup::setCurrent(QObject *object)
{
if (m_current == object)
return;
if (m_current)
m_current->setProperty(CHECKED_PROPERTY, QVariant(false));
m_current = object;
if (m_current)
m_current->setProperty(CHECKED_PROPERTY, QVariant(true));
Q_EMIT currentChanged();
}
QObject *ExclusiveGroup::current() const
{
return m_current.data();
}
/*!
* \qmlmethod void ExclusiveGroup::bindCheckable(object object)
* Explicitly bind an objects checkability to this exclusive group.
* \note This only works with objects which support the following signals signals:
* \list
* \li \b toggled(bool)
* \endlist
* \qml
* Item {
* ExclusiveGroup {
* id: exclusiveGroup
* }
* Instantiator {
* model: 4
* onObjectAdded: exclusiveGroup.bindCheckable(object)
* onObjectRemoved: exclusiveGroup.unbindCheckable(object)
*
* Action {
* checkable: true
* }
* }
* }
* \endqml
* \sa ExclusiveGroup::unbindCheckable
*/
void ExclusiveGroup::bindCheckable(QObject *object)
{
for (const char **signalName = checkableSignals; *signalName; signalName++) {
int signalIndex = object->metaObject()->indexOfSignal(*signalName);
if (signalIndex != -1) {
QMetaMethod signalMethod = object->metaObject()->method(signalIndex);
connect(object, signalMethod, m_signalMapper, m_updateCurrentMethod, Qt::UniqueConnection);
m_signalMapper->setMapping(object, object);
connect(object, SIGNAL(destroyed(QObject*)), this, SLOT(unbindCheckable(QObject*)), Qt::UniqueConnection);
if (!m_current && isChecked(object))
setCurrent(object);
break;
}
}
}
/*!
* \qmlmethod void ExclusiveGroup::unbindCheckable(object object)
* Explicitly unbind an objects checkability from this exclusive group.
* \sa ExclusiveGroup::bindCheckable
*/
void ExclusiveGroup::unbindCheckable(QObject *object)
{
if (m_current == object)
setCurrent(0);
disconnect(object, 0, m_signalMapper, 0);
disconnect(object, SIGNAL(destroyed(QObject*)), this, SLOT(unbindCheckable(QObject*)));
}
UT_NAMESPACE_END
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