/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the Technology Preview License Agreement accompanying ** this package. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qactiongroup.h" #ifndef QT_NO_ACTION #include "qaction_p.h" #include "qapplication.h" #include "qevent.h" #include "qlist.h" QT_BEGIN_NAMESPACE class QActionGroupPrivate : public QObjectPrivate { Q_DECLARE_PUBLIC(QActionGroup) public: QActionGroupPrivate() : exclusive(1), enabled(1), visible(1) { } QList actions; QPointer current; uint exclusive : 1; uint enabled : 1; uint visible : 1; private: void _q_actionTriggered(); //private slot void _q_actionChanged(); //private slot void _q_actionHovered(); //private slot }; void QActionGroupPrivate::_q_actionChanged() { Q_Q(QActionGroup); QAction *action = qobject_cast(q->sender()); Q_ASSERT_X(action != 0, "QWidgetGroup::_q_actionChanged", "internal error"); if(exclusive && action->isChecked() && action != current) { if(current) current->setChecked(false); current = action; } } void QActionGroupPrivate::_q_actionTriggered() { Q_Q(QActionGroup); QAction *action = qobject_cast(q->sender()); Q_ASSERT_X(action != 0, "QWidgetGroup::_q_actionTriggered", "internal error"); emit q->triggered(action); emit q->selected(action); } void QActionGroupPrivate::_q_actionHovered() { Q_Q(QActionGroup); QAction *action = qobject_cast(q->sender()); Q_ASSERT_X(action != 0, "QWidgetGroup::_q_actionHovered", "internal error"); emit q->hovered(action); } /*! \class QActionGroup \brief The QActionGroup class groups actions together. \ingroup application In some situations it is useful to group actions together. For example, if you have a \gui{Left Align} action, a \gui{Right Align} action, a \gui{Justify} action, and a \gui{Center} action, only one of these actions should be active at any one time. One simple way of achieving this is to group the actions together in an action group. Here's a example (from the \l{mainwindows/menus}{Menus} example): \snippet examples/mainwindows/menus/mainwindow.cpp 6 Here we create a new action group. Since the action group is exclusive by default, only one of the actions in the group is checked at any one time. \img qactiongroup-align.png Alignment options in a QMenu A QActionGroup emits an triggered() signal when one of its actions is chosen. Each action in an action group emits its triggered() signal as usual. As stated above, an action group is \l exclusive by default; it ensures that only one checkable action is active at any one time. If you want to group checkable actions without making them exclusive, you can turn of exclusiveness by calling setExclusive(false). Actions can be added to an action group using addAction(), but it is usually more convenient to specify a group when creating actions; this ensures that actions are automatically created with a parent. Actions can be visually separated from each other by adding a separator action to the group; create an action and use QAction's \l {QAction::}{setSeparator()} function to make it considered a separator. Action groups are added to widgets with the QWidget::addActions() function. \sa QAction */ /*! Constructs an action group for the \a parent object. The action group is exclusive by default. Call setExclusive(false) to make the action group non-exclusive. */ QActionGroup::QActionGroup(QObject* parent) : QObject(*new QActionGroupPrivate, parent) { } /*! Destroys the action group. */ QActionGroup::~QActionGroup() { } /*! \fn QAction *QActionGroup::addAction(QAction *action) Adds the \a action to this group, and returns it. Normally an action is added to a group by creating it with the group as its parent, so this function is not usually used. \sa QAction::setActionGroup() */ QAction *QActionGroup::addAction(QAction* a) { Q_D(QActionGroup); if(!d->actions.contains(a)) { d->actions.append(a); QObject::connect(a, SIGNAL(triggered()), this, SLOT(_q_actionTriggered())); QObject::connect(a, SIGNAL(changed()), this, SLOT(_q_actionChanged())); QObject::connect(a, SIGNAL(hovered()), this, SLOT(_q_actionHovered())); } if(!a->d_func()->forceDisabled) { a->setEnabled(d->enabled); a->d_func()->forceDisabled = false; } if(!a->d_func()->forceInvisible) { a->setVisible(d->visible); a->d_func()->forceInvisible = false; } if(a->isChecked()) d->current = a; QActionGroup *oldGroup = a->d_func()->group; if(oldGroup != this) { if (oldGroup) oldGroup->removeAction(a); a->d_func()->group = this; } return a; } /*! Creates and returns an action with \a text. The newly created action is a child of this action group. Normally an action is added to a group by creating it with the group as parent, so this function is not usually used. \sa QAction::setActionGroup() */ QAction *QActionGroup::addAction(const QString &text) { return new QAction(text, this); } /*! Creates and returns an action with \a text and an \a icon. The newly created action is a child of this action group. Normally an action is added to a group by creating it with the group as its parent, so this function is not usually used. \sa QAction::setActionGroup() */ QAction *QActionGroup::addAction(const QIcon &icon, const QString &text) { return new QAction(icon, text, this); } /*! Removes the \a action from this group. The action will have no parent as a result. \sa QAction::setActionGroup() */ void QActionGroup::removeAction(QAction *action) { Q_D(QActionGroup); if (d->actions.removeAll(action)) { if (action == d->current) d->current = 0; QObject::disconnect(action, SIGNAL(triggered()), this, SLOT(_q_actionTriggered())); QObject::disconnect(action, SIGNAL(changed()), this, SLOT(_q_actionChanged())); QObject::disconnect(action, SIGNAL(hovered()), this, SLOT(_q_actionHovered())); action->d_func()->group = 0; } } /*! Returns the list of this groups's actions. This may be empty. */ QList QActionGroup::actions() const { Q_D(const QActionGroup); return d->actions; } /*! \property QActionGroup::exclusive \brief whether the action group does exclusive checking If exclusive is true, only one checkable action in the action group can ever be active at any time. If the user chooses another checkable action in the group, the one they chose becomes active and the one that was active becomes inactive. \sa QAction::checkable */ void QActionGroup::setExclusive(bool b) { Q_D(QActionGroup); d->exclusive = b; } bool QActionGroup::isExclusive() const { Q_D(const QActionGroup); return d->exclusive; } /*! \fn void QActionGroup::setDisabled(bool b) This is a convenience function for the \l enabled property, that is useful for signals--slots connections. If \a b is true the action group is disabled; otherwise it is enabled. */ /*! \property QActionGroup::enabled \brief whether the action group is enabled Each action in the group will be enabled or disabled unless it has been explicitly disabled. \sa QAction::setEnabled() */ void QActionGroup::setEnabled(bool b) { Q_D(QActionGroup); d->enabled = b; for(QList::const_iterator it = d->actions.constBegin(); it != d->actions.constEnd(); ++it) { if(!(*it)->d_func()->forceDisabled) { (*it)->setEnabled(b); (*it)->d_func()->forceDisabled = false; } } } bool QActionGroup::isEnabled() const { Q_D(const QActionGroup); return d->enabled; } /*! Returns the currently checked action in the group, or 0 if none are checked. */ QAction *QActionGroup::checkedAction() const { Q_D(const QActionGroup); return d->current; } /*! \property QActionGroup::visible \brief whether the action group is visible Each action in the action group will match the visible state of this group unless it has been explicitly hidden. \sa QAction::setEnabled() */ void QActionGroup::setVisible(bool b) { Q_D(QActionGroup); d->visible = b; for(QList::Iterator it = d->actions.begin(); it != d->actions.end(); ++it) { if(!(*it)->d_func()->forceInvisible) { (*it)->setVisible(b); (*it)->d_func()->forceInvisible = false; } } } bool QActionGroup::isVisible() const { Q_D(const QActionGroup); return d->visible; } /*! \fn void QActionGroup::triggered(QAction *action) This signal is emitted when the given \a action in the action group is activated by the user; for example, when the user clicks a menu option, toolbar button, or presses an action's shortcut key combination. Connect to this signal for command actions. \sa QAction::activate() */ /*! \fn void QActionGroup::hovered(QAction *action) This signal is emitted when the given \a action in the action group is highlighted by the user; for example, when the user pauses with the cursor over a menu option, toolbar button, or presses an action's shortcut key combination. \sa QAction::activate() */ /*! \fn void QActionGroup::add(QAction* a) Use addAction() instead. */ /*! \fn void QActionGroup::addSeparator() Normally you add a separator to the menus or widgets to which actions are added, so this function is very rarely needed. \oldcode actionGroup->addSeparator(); \newcode QAction *separator = new QAction(this); separator->setSeparator(true); actionGroup->addAction(separator); \endcode */ /*! \fn bool QActionGroup::addTo(QWidget *widget) \oldcode actionGroup->addTo(widget); \newcode widget->addActions(actionGroup->actions()); \endcode */ /*! \fn void QActionGroup::selected(QAction *action); Use triggered() instead. */ QT_END_NAMESPACE #include "moc_qactiongroup.cpp" #endif // QT_NO_ACTION