/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** 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 developer.feedback@nokia.com.

**

****************************************************************************/

#include "hbmenu.h"

#include "hbmenu_p.h"

#include "hbmenuitem_p.h"

#include "hbaction.h"

#include <hbwidgetfeedback.h>

#include "hbinstance.h"

#include "hbmenucontainer_p.h"

#ifdef HB_EFFECTS

#include "hbeffect.h"

#include "hbeffectinternal_p.h"

bool HbMenuPrivate::menuEffectsLoaded = false;

#endif

#include "hbglobal_p.h"

#include <QGraphicsSceneMouseEvent>

#include <QPointer>

Q_DECLARE_METATYPE (QAction*)// krazy:exclude=qclasses

HbMenuPrivate::HbMenuPrivate():

    HbPopupPrivate(),

    menuItemView(0),

    subMenuAction(0),

    activeSubMenu(0),

    actionTriggered(false),

    menuType(HbMenu::ContextMenu),

    mSubMenuItem(0),

    mRightMargin(0.0),

    mDownMargin(0.0),

    delayMenuConstruction(true),

    receiverToDisconnectOnClose(0),

    mNumberOfColumns(1),

    mCloseAllMenus(false)

{

}

HbMenuPrivate::~HbMenuPrivate()

{

}

void HbMenuPrivate::init()

{

    Q_Q(HbMenu);

    subMenuAction = new HbAction(q);

    subMenuAction->setMenu(q);

    q->setTimeout(HbPopup::ContextMenuTimeout);

    q->setBackgroundFaded(false);

}

void HbMenuPrivate::addPopupEffects()

{

#ifdef HB_EFFECTS

    hasEffects = menuEffectsLoaded;

    if (menuEffectsLoaded)

        return;

    menuEffectsLoaded = true;

    hasEffects = HbEffectInternal::add("HB_MENU", "menu_appear", "appear");

    if (hasEffects) {

        hasEffects = HbEffectInternal::add("HB_MENU", "menu_disappear", "disappear");

        if (hasEffects) {

            hasEffects = HbEffectInternal::add("HB_menuitem", "menuitem_press", "clicked");

        }

    }

#endif

}

void HbMenuPrivate::_q_triggerAction(HbMenuItem *currentItem)

{

    Q_Q(HbMenu);

    if (currentItem && currentItem->action()){

        HbWidgetFeedback::triggered(currentItem, Hb::InstantClicked);

#ifdef HB_EFFECTS

        if (hasEffects) {

            HbEffect::start(currentItem, "HB_menuitem", "clicked");

        }

#endif

        HbAction *hbAction = qobject_cast<HbAction *>(currentItem->action());

        if (hbAction && hbAction->menu() && !actionTriggered) {

            hbAction->trigger();

            stopTimeout();

            openSubmenu(currentItem);

        } else {

            q->close();

            if (!actionTriggered) { // prevent duplicate events

                currentItem->action()->trigger();

            }

            actionTriggered = true;

        }

    }

}

void HbMenuPrivate::createMenuView()

{

    Q_Q(HbMenu);

    if (!menuItemView && q->actions().count()){

        menuItemView = new HbMenuListView(q, q);        

        HbStyle::setItemName(menuItemView, "content");

        //This optimises case of options menu which otherwise updates its primitives twice.

        if (menuType ==  HbMenu::OptionsMenu)

            q->setFrameType(HbPopup::Strong);

        else

            q->setFrameType(HbPopup::Weak);

        if (polished)//This check can be removed once base class repolish is fixed.

            q->repolish();

    }   

}

void HbMenuPrivate::delayedLayout()

{

    if (delayMenuConstruction) {

        createMenuView();

        if(menuItemView)

            menuItemView->doDelayedLayout();

        delayMenuConstruction = false;

    }

}

void HbMenuPrivate::changeToOptionsMenu()

{

    menuType = HbMenu::OptionsMenu;

}

HbMenuItem *HbMenuPrivate::subMenuItem()

{

    return mSubMenuItem;

}

void HbMenuPrivate::setSubMenuItem(HbMenuItem *menuItem)

{

    mSubMenuItem = menuItem;

}

void HbMenuPrivate::_q_onActionTriggered()

{

    Q_Q(HbMenu);

    }

}

void HbMenuPrivate::_q_subMenuItemTriggered(HbAction *action)

{

    Q_Q(HbMenu);    

    // do not close the menu tree if the triggered action is

    // submenu item

    if (!action->menu()) { 

        mCloseAllMenus = true;

        q->close();

    } else {

        stopTimeout();

    }

}

void HbMenuPrivate::actionAdded(QActionEvent *actionEvent)

{

    if (delayMenuConstruction)

        return;

    Q_Q(HbMenu);

    QObject::connect(actionEvent->action(), SIGNAL(triggered()), q, SLOT(_q_onActionTriggered()));

    if (actionEvent->action()->isVisible()){        

        createMenuView();        

        menuItemView->addActionItem(actionEvent->action());

    }

}

void HbMenuPrivate::actionRemoved(QActionEvent *actionEvent)

{

    if (delayMenuConstruction)

        return;

    Q_Q(HbMenu);

    QObject::disconnect(actionEvent->action(), 0, q, 0);

    if (menuItemView)

        menuItemView->removeActionItem(actionEvent->action());

}

void HbMenuPrivate::actionChanged(QActionEvent *actionEvent)

{

    if (delayMenuConstruction)

        return;

    if (menuItemView)

        menuItemView->updateActionItem(actionEvent->action());

}

/*

    Returns current focusable action based on current row of the menuItemView or index if specified.

    If there is no focusable action it returns 0.

    Also returns the active item representing the active action or 0.

*/

HbAction *HbMenuPrivate::activeAction(HbMenuItem *&activeItem) const

{

    if(!menuItemView)

        return 0;

    HbAction *action = 0;

    HbMenuItem *currentItem = menuItemView->currentItem();

    if(currentItem && currentItem->action() && currentItem->action()->isVisible() &&

       currentItem->action()->isEnabled() && !currentItem->action()->isSeparator()) {

        action = static_cast<HbAction*>(currentItem->action());

        activeItem = currentItem;

    }

    return action;

}

/*

    Convenience overload

*/

HbAction *HbMenuPrivate::activeAction() const

{

    HbMenuItem* activeItem = 0;

    return activeAction(activeItem);

}

/*

    Opens a submenu for activeItem. If activeItem is 0 it uses activeAction() to determine active item

    and opens submenu for it if active action has submenu.

*/

void HbMenuPrivate::openSubmenu(HbMenuItem *activeItem)

{

    Q_Q(HbMenu);

    if (!activeItem) {

        activeAction(activeItem);

    }

    if (activeItem && activeItem->action() && activeItem->action()->isEnabled()) {

        HbAction *hbAction = qobject_cast<HbAction *>(activeItem->action());

        if (!hbAction)

            return;

        HbMenu *subMenu = hbAction->menu();

        if ( subMenu ) {

            subMenu->setLayoutDirection(q->layoutDirection());

            activeSubMenu = subMenu; 

            subMenu->setTimeout(timeout); 

            QObject::disconnect(subMenu, SIGNAL(aboutToClose()), q, SLOT(_q_subMenuTimedOut()));

            QObject::connect(subMenu, SIGNAL(aboutToClose()), q, SLOT(_q_subMenuTimedOut()));

            QObject::connect(subMenu, SIGNAL(triggered(HbAction*)), q, SLOT(_q_subMenuItemTriggered(HbAction*)));

            subMenu->show();

            // Reset the active submenu so that mouse event handling works.

            // huh ? activeSubMenu = 0;

        }

    }

}

/*

    reimp

*/

void HbMenuPrivate::handleBackgroundMouseReleaseEvent(QGraphicsSceneMouseEvent *event)

{

    Q_Q(HbMenu);

    // Handle cases only for Background or Popup originated mouse presses and when

    // any dismiss policy defined

    if (mousePressLocation != None && dismissPolicy != HbPopup::NoDismiss) {

        MouseEventLocationType mouseReleaseLocation = Background;

        HbMenu* tempMenu = 0;

        QList<QGraphicsItem*> itemList = q->scene()->items(event->pos());

        foreach (QGraphicsItem* sceneItem, itemList ){

            QGraphicsWidget *focusWidget = 0;

            HbMenu *focusMenu = 0;

            if (sceneItem && sceneItem->isWidget()) {

                focusWidget = static_cast<QGraphicsWidget*>(sceneItem);

                focusMenu = qobject_cast<HbMenu *>(focusWidget);

            }

            if( focusMenu ) {

                mouseReleaseLocation = Popup;

                tempMenu = focusMenu;

                break;

            }

        }

        // Mouse is released within menu

        if (mouseReleaseLocation == Popup) {

            HbAction* menuAction = tempMenu->activeAction();

            if(menuAction){

                mCloseAllMenus = false;

                closeMenuRecursively(menuAction);

            }

        mousePressLocation = None;

        }

        else {

            // trigger the menu to close whole menu

            mCloseAllMenus = true;

            q->close();

            mousePressLocation = None;

        }

    }

}

void HbMenuPrivate::_q_subMenuTimedOut()

{

    Q_Q(HbMenu);

    if( menuTimedOut (activeSubMenu) ) {

        if ( activeSubMenu ) {

            activeSubMenu->disconnect();

        }

        timedOut = true;

        q->close();

    } else {

        startTimeout();

        mCloseAllMenus = false;

    }

    if (activeSubMenu && HbMenuPrivate::d_ptr(activeSubMenu)->mCloseAllMenus) {

        mCloseAllMenus = true;

        q->close();

   }

}

void HbMenuPrivate::_q_handleMenuClose()

{

    Q_Q(HbMenu);

    if ( menuType == HbMenu::ContextMenu || menuType == HbMenu::OptionsMenu ) {

        if(activeSubMenu){

            HbAction* action = activeSubMenu->activeAction();

            if(action) {

                closeMenuRecursively(action);

            }

            closeSubmenu();

        }

        q->close();

    }

}

/*

    Handles menu close

*/

void HbMenuPrivate::closeMenu()

{

    Q_Q(HbMenu);

    HbMainWindow* w(q->mainWindow());

    if ( w ){

        QObject::disconnect( w, SIGNAL(aboutToChangeOrientation()),

                             q, SLOT(_q_handleMenuClose()));

        QObject::connect( w, SIGNAL(aboutToChangeOrientation()),

                        q, SLOT(_q_handleMenuClose()));

        QObject::disconnect( w, SIGNAL(aboutToChangeView(HbView*, HbView*)),

                          q, SLOT(_q_handleMenuClose()));

        QObject::connect( w, SIGNAL(aboutToChangeView(HbView*, HbView*)),

                          q, SLOT(_q_handleMenuClose()));

    }

}

void HbMenuPrivate::closeMenuRecursively(HbAction* menuAction)

{

    if(menuAction->menu() && menuAction->menu()->activeAction()) {

        closeMenuRecursively(menuAction->menu()->activeAction());

    }

    if(menuAction->menu()) {

        menuAction->menu()->close();

    }

}

bool HbMenuPrivate::menuTimedOut(HbMenu* menu)

{

    return (menu && menu->timeout() > 0 && HbMenuPrivate::d_ptr(menu)->timedOut);

}

void HbMenuPrivate::closeSubmenu()

{

    // Check whether this is a submenu.

    if (activeSubMenu) {

        activeSubMenu->close();

    }

}

void HbMenuPrivate::setSubMenuPosition()

{

    Q_Q(HbMenu);

    if (mSubMenuItem) {        

        qreal upperEdge = mSubMenuItem->scenePos().y() + mSubMenuItem->size().height() * 2 / 3;

        QSizeF windowSize = QSizeF(0,0);

        if (q->mainWindow()) {

            windowSize = q->mainWindow()->layoutRect().size();

        }

        if (windowSize.height() - mDownMargin - q->preferredHeight() < upperEdge) {

            upperEdge = windowSize.height() - mDownMargin - q->preferredHeight();

        }

        if (q->layoutDirection() == Qt::LeftToRight) {

            qreal leftEdge = mSubMenuItem->scenePos().x() +

                             mSubMenuItem->size().width() - mRightMargin;

            if ((windowSize.width() - q->size().width()) < leftEdge) {

                leftEdge = mSubMenuItem->scenePos().x() +

                           mSubMenuItem->size().width() +

                           mRightMargin - q->size().width();

            }

        } else {

            qreal rightEdge = mSubMenuItem->scenePos().x() + mRightMargin;

            if ((rightEdge - q->size().width()) < 0) {

                rightEdge = mSubMenuItem->scenePos().x() - mRightMargin +

                            q->size().width();

            }

            q->setPreferredPos(QPointF(rightEdge, upperEdge), HbPopup::TopRightCorner);

        }

    }

}

/*!

    @beta

    @hbcore

    \class HbMenu

    \brief The HbMenu class provides a widget that shows a list of options.

    A menu consists of a list of options that the user can select. When the user selects

    an option, it triggers a command. Menus are hidden by default and open in response

    to an action from the user. For this reason, the toolbar (HbToolBar class) usually

    provides access to the most important commands (called first order commands) and

    menus provide access to second order commands.

    \image html hbmenu.png An options menu with a submenu that has checkable actions

    You can use the %HbMenu class to create the following:

    - An \b options \b menu, which shows options that relate to the whole view. It is

    a drop-down menu that is directly owned by the view (HbView object). It opens when the

    user taps on the view's title bar. You can access a view's options menu by calling

    HbView::menu(). This returns a pointer to a new empty menu if the menu does not

    already exist. A view can have only one options menu.

    - A \b context \b menu, which is a pop-up menu that shows options that relate to a

    specific item, rather than to the entire view. It typically opens in response to a

    UI event, such as a tap on a widget or a particular point within the view. You can

    create any number of context menus.

    A menu is a list of actions, which are objects of class HbAction. A menu can contain:

    - \b Separators, which are actions that group related items. Use addSeparator() or

    insertSeparator() to create a separator and add it to a menu.

    - Actions that trigger a \b submenu to open. Submenus are menus that are nested within

    another menu. Use addMenu() or insertMenu() to add a submenu to a menu. Although it is

    possible to nest submenus within other submenus, generally this is not considered good

    design practice.

    - \b Action \b items, which represent the menu options. Use addAction() and insertAction() to

    add an action to a menu. Use addActions() and insertActions() to add and insert multiple

    actions in one operation. Use clearActions() to clear all of the actions from a menu and

    removeAction() to remove individual actions from a menu.

    The order of the actions within the menu controls the order of the options that the user sees.

    When you add the actions directly to the menu, addAction() and addActions() append the actions

    to the end of the menu and insertAction() and insertActions() enable you to specify the position.

    For options menus, however, there is an alternative approach to ordering the action items.

    This is to call HbView::addAction() to add actions to the \b view and let the view distribute

    them to the options menu or toolbar, depending on the preference set, the UI command distribution

    template, and taking into account the available space in the toolbar. The menu and toolbar

    then order the actions according to their defined roles and the UI command container template.

    This approach makes it easier to create consistent user interfaces and applications that

    work well on a variety of different devices.

    An action item can be checkable, which means that it has an on/off state. You specify that an

    action item is checkable by calling \c setCheckable() on the action. Use \c isChecked()

    to discover if an action is checked. You can also use the QAction::toggled(bool) signal to

    receive notification of a change in the checked status.

    After you add an action item to a menu, you can connect its \link HbAction::triggered()

    triggered()\endlink signal to a slot on a receiver object. Alternatively you can use the

    addAction(const QString &, const QObject *, const char *) overload to add an action item and

    specify a receiver slot at the same time. The receiver is notified when the action item

    is \link HbAction::triggered() triggered()\endlink.

    You can also connect the HbMenu::triggered(HbAction*) signal to a receiver object's slot. This

    signal is emitted when any menu action is triggered. You can find out which action was

    triggered from the HbAction parameter.

    \section _usecases_hbmenu Using the HbMenu class