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#include "qapplication.h"
#include "qevent.h"
#include "qbitmap.h"
#include "qstyle.h"
#include "qmenubar.h"
#include "private/qt_s60_p.h"
#include "private/qmenu_p.h"
#include "private/qsoftkeymanager_p.h"
#include "private/qsoftkeymanager_s60_p.h"
#include "private/qobject_p.h"
#include <eiksoftkeyimage.h>
#include <eikcmbut.h>

#ifndef QT_NO_SOFTKEYMANAGER
QT_BEGIN_NAMESPACE

const int S60_COMMAND_START = 6000;
const int LSK_POSITION = 0;
const int MSK_POSITION = 3;
const int RSK_POSITION = 2;

QSoftKeyManagerPrivateS60::QSoftKeyManagerPrivateS60()
{
    cachedCbaIconSize[0] = QSize(0,0);
    cachedCbaIconSize[1] = QSize(0,0);
    cachedCbaIconSize[2] = QSize(0,0);
    cachedCbaIconSize[3] = QSize(0,0);
    skipNextUpdate = false;
}

bool QSoftKeyManagerPrivateS60::skipCbaUpdate()
{
    // lets not update softkeys if
    // 1. We don't have application panes, i.e. cba
    // 2. S60 native dialog or menu is shown
    if (QApplication::testAttribute(Qt::AA_S60DontConstructApplicationPanes) ||
        CCoeEnv::Static()->AppUi()->IsDisplayingMenuOrDialog() || skipNextUpdate) {
        skipNextUpdate = false;
        return true;
    }
    return false;
}

void QSoftKeyManagerPrivateS60::ensureCbaVisibilityAndResponsiviness(CEikButtonGroupContainer &cba)
{
    RDrawableWindow *cbaWindow = cba.DrawableWindow();
    Q_ASSERT_X(cbaWindow, Q_FUNC_INFO, "Native CBA does not have window!");
    // Make sure CBA is visible, i.e. CBA window is on top
    cbaWindow->SetOrdinalPosition(0);
    // Qt shares same CBA instance between top-level widgets,
    // make sure we are not faded by underlying window.
    cbaWindow->SetFaded(EFalse, RWindowTreeNode::EFadeIncludeChildren);
    // Modal dialogs capture pointer events, but shared cba instance
    // shall stay responsive. Raise pointer capture priority to keep
    // softkeys responsive in modal dialogs
    cbaWindow->SetPointerCapturePriority(1);
}

void QSoftKeyManagerPrivateS60::clearSoftkeys(CEikButtonGroupContainer &cba)
{
    QT_TRAP_THROWING(
        //Using -1 instead of EAknSoftkeyEmpty to avoid flickering.
        cba.SetCommandL(0, -1, KNullDesC);
        // TODO: Should we clear also middle SK?
        cba.SetCommandL(2, -1, KNullDesC);
    );
    realSoftKeyActions.clear();
}

QString QSoftKeyManagerPrivateS60::softkeyText(QAction &softkeyAction)
{
    // In S60 softkeys and menu items do not support key accelerators (i.e.
    // CTRL+X). Therefore, removing the accelerator characters from both softkey
    // and menu item texts.
    const int underlineShortCut = QApplication::style()->styleHint(QStyle::SH_UnderlineShortcut);
    QString iconText = softkeyAction.iconText();
    return underlineShortCut ? softkeyAction.text() : iconText;
}

QAction *QSoftKeyManagerPrivateS60::highestPrioritySoftkey(QAction::SoftKeyRole role)
{
    QAction *ret = NULL;
    // Priority look up is two level
    // 1. First widget with softkeys always has highest priority
    for (int level = 0; !ret; level++) {
        // 2. Highest priority action within widget
        QList<QAction*> actions = requestedSoftKeyActions.values(level);
        if (actions.isEmpty())
            break;
        qSort(actions.begin(), actions.end(), QSoftKeyManagerPrivateS60::actionPriorityMoreThan);
        foreach (QAction *action, actions) {
            if (action->softKeyRole() == role) {
                ret = action;
                break;
            }
        }
    }
    return ret;
}

bool QSoftKeyManagerPrivateS60::actionPriorityMoreThan(const QAction *firstItem, const QAction *secondItem)
{
    return firstItem->priority() > secondItem->priority();
}

void QSoftKeyManagerPrivateS60::setNativeSoftkey(CEikButtonGroupContainer &cba,
                                              TInt position, TInt command, const TDesC &text)
{
    // Calling SetCommandL causes CBA redraw
    QT_TRAP_THROWING(cba.SetCommandL(position, command, text));
}

QPoint QSoftKeyManagerPrivateS60::softkeyIconPosition(int position, QSize sourceSize, QSize targetSize)
{
    QPoint iconPosition(0,0);
    switch( AknLayoutUtils::CbaLocation() )
        {
        case AknLayoutUtils::EAknCbaLocationBottom:
            // RSK must be moved to right, LSK in on correct position by default
            if (position == RSK_POSITION)
                iconPosition.setX(targetSize.width() - sourceSize.width());
            break;
        case AknLayoutUtils::EAknCbaLocationRight:
        case AknLayoutUtils::EAknCbaLocationLeft:
            // Already in correct position
        default:
            break;
        }

    // Align horizontally to center
    iconPosition.setY((targetSize.height() - sourceSize.height()) >> 1);
    return iconPosition;
}

QPixmap QSoftKeyManagerPrivateS60::prepareSoftkeyPixmap(QPixmap src, int position, QSize targetSize)
{
    QPixmap target(targetSize);
    target.fill(Qt::transparent);
    QPainter p;
    p.begin(&target);
    p.drawPixmap(softkeyIconPosition(position, src.size(), targetSize), src);
    p.end();
    return target;
}

bool QSoftKeyManagerPrivateS60::isOrientationLandscape()
{
    // Hard to believe that there is no public API in S60 to
    // get current orientation. This workaround works with currently supported resolutions
    return  S60->screenHeightInPixels <  S60->screenWidthInPixels;
}

QSize QSoftKeyManagerPrivateS60::cbaIconSize(CEikButtonGroupContainer *cba, int position)
{

    int index = position;
    index += isOrientationLandscape() ? 0 : 1;
    if(cachedCbaIconSize[index].isNull()) {
        // Only way I figured out to get CBA icon size without RnD SDK, was
        // to set some dummy icon to CBA first and then ask CBA button CCoeControl::Size()
        // The returned value is cached to avoid unnecessary icon setting every time.
        const bool left = (position == LSK_POSITION);
        if(position == LSK_POSITION || position == RSK_POSITION) {
            CEikImage* tmpImage = NULL;
            QT_TRAP_THROWING(tmpImage = new (ELeave) CEikImage);
            EikSoftkeyImage::SetImage(cba, *tmpImage, left); // Takes myimage ownership
            int command = S60_COMMAND_START + position;
            setNativeSoftkey(*cba, position, command, KNullDesC());
            cachedCbaIconSize[index] = qt_TSize2QSize(cba->ControlOrNull(command)->Size());
            EikSoftkeyImage::SetLabel(cba, left);

            if(cachedCbaIconSize[index] == QSize(138,72)) {
                // Hack for S60 5.0 (5800) landscape orientation, which return wrong icon size
                cachedCbaIconSize[index] = QSize(60,60);
            }
        }
    }

    return cachedCbaIconSize[index];
}

bool QSoftKeyManagerPrivateS60::setSoftkeyImage(CEikButtonGroupContainer *cba,
                                            QAction &action, int position)
{
    bool ret = false;

    const bool left = (position == LSK_POSITION);
    if(position == LSK_POSITION || position == RSK_POSITION) {
        QIcon icon = action.icon();
        if (!icon.isNull()) {
            // Get size of CBA icon area based on button position and orientation
            QSize requiredIconSize = cbaIconSize(cba, position);
            // Get pixmap out of icon based on preferred size, the aspect ratio is kept
            QPixmap pmWihtAspectRatio = icon.pixmap(requiredIconSize);
            // Native softkeys require that pixmap size is exactly the same as requiredIconSize
            // prepareSoftkeyPixmap creates a new pixmap with requiredIconSize and blits the 'pmWihtAspectRatio'
            // to correct location of it
            QPixmap softkeyPixmap = prepareSoftkeyPixmap(pmWihtAspectRatio, position, requiredIconSize);

            QPixmap softkeyAlpha = softkeyPixmap.alphaChannel();
            // Alpha channel in 5.1 and older devices need to be inverted
            // TODO: Switch to use toSymbianCFbsBitmap with invert when available
            if(QSysInfo::s60Version() <= QSysInfo::SV_S60_5_1) {
                QImage alphaImage = softkeyAlpha.toImage();
                alphaImage.invertPixels();
                softkeyAlpha = QPixmap::fromImage(alphaImage);
            }

            CFbsBitmap* nBitmap = softkeyPixmap.toSymbianCFbsBitmap();
            CFbsBitmap* nMask = softkeyAlpha.toSymbianCFbsBitmap();

            CEikImage* myimage = new (ELeave) CEikImage;
            myimage->SetPicture( nBitmap, nMask ); // nBitmap and nMask ownership transfered

            EikSoftkeyImage::SetImage(cba, *myimage, left); // Takes myimage ownership
            ret = true;
        } else {
            // Restore softkey to text based
            EikSoftkeyImage::SetLabel(cba, left);
        }
    }
    return ret;
}

bool QSoftKeyManagerPrivateS60::setSoftkey(CEikButtonGroupContainer &cba,
                                        QAction::SoftKeyRole role, int position)
{
    QAction *action = highestPrioritySoftkey(role);
    if (action) {
        setSoftkeyImage(&cba, *action, position);
        QString text = softkeyText(*action);
        TPtrC nativeText = qt_QString2TPtrC(text);
        int command = S60_COMMAND_START + position;
        setNativeSoftkey(cba, position, command, nativeText);
        cba.DimCommand(command, !action->isEnabled());
        realSoftKeyActions.insert(command, action);
        return true;
    }
    return false;
}

bool QSoftKeyManagerPrivateS60::setLeftSoftkey(CEikButtonGroupContainer &cba)
{
    return setSoftkey(cba, QAction::PositiveSoftKey, LSK_POSITION);
}

bool QSoftKeyManagerPrivateS60::setMiddleSoftkey(CEikButtonGroupContainer &cba)
{
    // Note: In order to get MSK working, application has to have EAknEnableMSK flag set
    // Currently it is not possible very easily)
    // For more information see: http://wiki.forum.nokia.com/index.php/Middle_softkey_usage
    return setSoftkey(cba, QAction::SelectSoftKey, MSK_POSITION);
}

bool QSoftKeyManagerPrivateS60::setRightSoftkey(CEikButtonGroupContainer &cba)
{
    if (!setSoftkey(cba, QAction::NegativeSoftKey, RSK_POSITION)) {
        Qt::WindowType windowType = Qt::Window;
        QAction *action = requestedSoftKeyActions.value(0);
        if (action) {
            QWidget *actionParent = action->parentWidget();
            Q_ASSERT_X(actionParent, Q_FUNC_INFO, "No parent set for softkey action!");

            QWidget *actionWindow = actionParent->window();
            Q_ASSERT_X(actionWindow, Q_FUNC_INFO, "Softkey action does not have window!");
            windowType = actionWindow->windowType();
        }

        if (windowType != Qt::Dialog && windowType != Qt::Popup) {
            QString text(QSoftKeyManager::tr("Exit"));
            TPtrC nativeText = qt_QString2TPtrC(text);
            EikSoftkeyImage::SetLabel(&cba, false);
            setNativeSoftkey(cba, RSK_POSITION, EAknSoftkeyExit, nativeText);
            return true;
        }
    }
    return false;
}

void QSoftKeyManagerPrivateS60::setSoftkeys(CEikButtonGroupContainer &cba)
{
    int requestedSoftkeyCount = requestedSoftKeyActions.count();
    const int maxSoftkeyCount = 2; // TODO: differs based on orientation ans S60 versions (some have MSK)
    if (requestedSoftkeyCount > maxSoftkeyCount) {
        // We have more softkeys than available slots
        // Put highest priority negative action to RSK and Options menu with rest of softkey actions to LSK
        // TODO: Build menu
        setLeftSoftkey(cba);
        if(AknLayoutUtils::MSKEnabled())
            setMiddleSoftkey(cba);
        setRightSoftkey(cba);
    } else {
        // We have less softkeys than available slots
        // Put softkeys to request slots based on role
        setLeftSoftkey(cba);
        if(AknLayoutUtils::MSKEnabled())
            setMiddleSoftkey(cba);
        setRightSoftkey(cba);
    }
}

void QSoftKeyManagerPrivateS60::updateSoftKeys_sys()
{
    if (skipCbaUpdate())
        return;

    CEikButtonGroupContainer *nativeContainer = S60->buttonGroupContainer();
    Q_ASSERT_X(nativeContainer, Q_FUNC_INFO, "Native CBA does not exist!");
    ensureCbaVisibilityAndResponsiviness(*nativeContainer);
    clearSoftkeys(*nativeContainer);
    setSoftkeys(*nativeContainer);

    nativeContainer->DrawDeferred(); // 3.1 needs an extra invitation
}

bool QSoftKeyManagerPrivateS60::handleCommand(int command)
{
    QAction *action = realSoftKeyActions.value(command);
    if (action) {
        QVariant property = action->property(MENU_ACTION_PROPERTY);
        if (property.isValid() && property.toBool()) {
            QT_TRAP_THROWING(S60->menuBar()->TryDisplayMenuBarL());
        } else if (action->menu()) {
            // TODO: This is hack, in order to use exising QMenuBar implementation for Symbian
            // menubar needs to have widget to which it is associated. Since we want to associate
            // menubar to action (which is inherited from QObejct), we create and associate QWidget
            // to action and pass that for QMenuBar. This associates the menubar to action, and we
            // can have own menubar for each action.
            QWidget *actionContainer = action->property("_q_action_widget").value<QWidget*>();
            if(!actionContainer) {
                actionContainer = new QWidget(action->parentWidget());
                QMenuBar *menuBar = new QMenuBar(actionContainer);
                foreach(QAction *menuAction, action->menu()->actions()) {
                    QMenu *menu = menuAction->menu();
                    if(menu)
                        menuBar->addMenu(action->menu());
                    else
                        menuBar->addAction(menuAction);
                }
                QVariant v;
                v.setValue(actionContainer);
                action->setProperty("_q_action_widget", v);
            }
            qt_symbian_next_menu_from_action(actionContainer);
            QT_TRAP_THROWING(S60->menuBar()->TryDisplayMenuBarL());
            // TODO: hack remove, it can happen that IsDisplayingMenuOrDialog return false
            // in updateSoftKeys_sys, and we will override menu CBA with our own
            skipNextUpdate = true;
        } else {
            Q_ASSERT(action->softKeyRole() != QAction::NoSoftKey);
            QWidget *actionParent = action->parentWidget();
            Q_ASSERT_X(actionParent, Q_FUNC_INFO, "No parent set for softkey action!");
            if (actionParent->isEnabled()) {
                action->activate(QAction::Trigger);
                return true;
            }
        }
    }
    return false;
}

QT_END_NAMESPACE
#endif //QT_NO_SOFTKEYMANAGER
