gecko-dev/widget/src/qt/mozqwidget.cpp

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 *
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#include <QtGui/QApplication>
#include <QtGui/QCursor>
#include <QtGui/QInputContext>
#include <QtGui/QGraphicsSceneContextMenuEvent>
#include <QtGui/QGraphicsSceneDragDropEvent>
#include <QtGui/QGraphicsSceneMouseEvent>
#include <QtGui/QGraphicsSceneHoverEvent>
#include <QtGui/QGraphicsSceneWheelEvent>

#include <QtCore/QEvent>
#include <QtCore/QVariant>
#include <QtCore/QTimer>

#include "mozqwidget.h"
#include "nsWindow.h"

/*
  Pure Qt is lacking a clear API to get the current state of the VKB (opened
  or closed). So this global is used to track that state for 
  nsWindow::GetIMEEnabled().
*/
static bool gKeyboardOpen = false;

/*
  In case we could not open the keyboard, we will try again when the focus
  event is sent.  This can happen if the keyboard is asked for before the
  window is focused. This global is used to track that case.
*/
static bool gFailedOpenKeyboard = false;
 
/*
  For websites that focus editable elements during other operations for a very
  short time, we add some decoupling to prevent the VKB from appearing and 
  reappearing for a very short time. This global is set when the keyboard should
  be opened and if it is still set when a timer runs out, the VKB is really
  shown.
*/
static bool gPendingVKBOpen = false;

MozQWidget::MozQWidget(nsWindow* aReceiver, QGraphicsItem* aParent)
    : QGraphicsWidget(aParent),
      mReceiver(aReceiver)
{
#if (QT_VERSION >= QT_VERSION_CHECK(4, 6, 0))
     setFlag(QGraphicsItem::ItemAcceptsInputMethod);
     setAcceptTouchEvents(true);
#endif
}

MozQWidget::~MozQWidget()
{
    if (mReceiver)
        mReceiver->QWidgetDestroyed();
}

void MozQWidget::paint(QPainter* aPainter, const QStyleOptionGraphicsItem* aOption, QWidget* aWidget /*= 0*/)
{
    mReceiver->DoPaint(aPainter, aOption, aWidget);
}

void MozQWidget::activate()
{
    // ensure that the keyboard is hidden when we activate the window
    hideVKB();
    mReceiver->DispatchActivateEventOnTopLevelWindow();
}

void MozQWidget::deactivate()
{
    // ensure that the keyboard is hidden when we deactivate the window
    hideVKB();
    mReceiver->DispatchDeactivateEventOnTopLevelWindow();
}

void MozQWidget::resizeEvent(QGraphicsSceneResizeEvent* aEvent)
{
    mReceiver->OnResizeEvent(aEvent);
}

void MozQWidget::contextMenuEvent(QGraphicsSceneContextMenuEvent* aEvent)
{
    mReceiver->contextMenuEvent(aEvent);
}

void MozQWidget::dragEnterEvent(QGraphicsSceneDragDropEvent* aEvent)
{
    mReceiver->OnDragEnter(aEvent);
}

void MozQWidget::dragLeaveEvent(QGraphicsSceneDragDropEvent* aEvent)
{
    mReceiver->OnDragLeaveEvent(aEvent);
}

void MozQWidget::dragMoveEvent(QGraphicsSceneDragDropEvent* aEvent)
{
    mReceiver->OnDragMotionEvent(aEvent);
}

void MozQWidget::dropEvent(QGraphicsSceneDragDropEvent* aEvent)
{
    mReceiver->OnDragDropEvent(aEvent);
}

void MozQWidget::focusInEvent(QFocusEvent* aEvent)
{
    mReceiver->OnFocusInEvent(aEvent);

    // The application requested the VKB during startup but did not manage
    // to open it, because there was no focused window yet so we do it now by
    // requesting the VKB without any timeout.
    if (gFailedOpenKeyboard)
        requestVKB(0);
}

void MozQWidget::focusOutEvent(QFocusEvent* aEvent)
{
    mReceiver->OnFocusOutEvent(aEvent);
}

void MozQWidget::hoverEnterEvent(QGraphicsSceneHoverEvent* aEvent)
{
    mReceiver->OnEnterNotifyEvent(aEvent);
}

void MozQWidget::hoverLeaveEvent(QGraphicsSceneHoverEvent* aEvent)
{
    mReceiver->OnLeaveNotifyEvent(aEvent);
}

void MozQWidget::hoverMoveEvent(QGraphicsSceneHoverEvent* aEvent)
{
    mReceiver->OnMoveEvent(aEvent);
}

void MozQWidget::keyPressEvent(QKeyEvent* aEvent)
{
#if (MOZ_PLATFORM_MAEMO==5)
    // Below removed to prevent invertion of upper and lower case
    // See bug 561234
    // mReceiver->OnKeyPressEvent(aEvent);
#else
    mReceiver->OnKeyPressEvent(aEvent);
#endif
}

void MozQWidget::keyReleaseEvent(QKeyEvent* aEvent)
{
#if (MOZ_PLATFORM_MAEMO==5)
    // Below line should be removed when bug 561234 is fixed
    mReceiver->OnKeyPressEvent(aEvent);
#endif
    mReceiver->OnKeyReleaseEvent(aEvent);
}

void MozQWidget::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* aEvent)
{
    // Qt sends double click event, but not second press event.
    mReceiver->OnButtonPressEvent(aEvent);
    mReceiver->OnMouseDoubleClickEvent(aEvent);
}

void MozQWidget::mouseMoveEvent(QGraphicsSceneMouseEvent* aEvent)
{
    mReceiver->OnMotionNotifyEvent(aEvent);
}

void MozQWidget::mousePressEvent(QGraphicsSceneMouseEvent* aEvent)
{
    mReceiver->OnButtonPressEvent(aEvent);
}

void MozQWidget::mouseReleaseEvent(QGraphicsSceneMouseEvent* aEvent)
{
    mReceiver->OnButtonReleaseEvent(aEvent);
}

bool MozQWidget::event ( QEvent * event )
{
    // check receiver, since due to deleteLater() call it's possible, that
    // events pass loop after receiver's destroy and while widget is still alive
    if (!mReceiver)
        return QGraphicsWidget::event(event);

#if (QT_VERSION >= QT_VERSION_CHECK(4, 6, 0))
    switch (event->type())
    {
    case QEvent::TouchBegin:
    case QEvent::TouchEnd:
    case QEvent::TouchUpdate:
    {
        // Do not send this event to other handlers, this is needed
        // to be able to receive the gesture events
        PRBool handled = PR_FALSE;
        mReceiver->OnTouchEvent(static_cast<QTouchEvent *>(event),handled);
        return handled;
    }
    case (QEvent::Gesture):
    {
        PRBool handled = PR_FALSE;
        mReceiver->OnGestureEvent(static_cast<QGestureEvent*>(event),handled);
        return handled;
    }
    case QEvent::InputMethod:
    {
        PRBool handled = PR_FALSE;
        mReceiver->imComposeEvent(static_cast<QInputMethodEvent*>(event),handled);
        return handled;
    }

    default:
        break;
    }
#endif
    return QGraphicsWidget::event(event);
}

void MozQWidget::wheelEvent(QGraphicsSceneWheelEvent* aEvent)
{
    mReceiver->OnScrollEvent(aEvent);
}

void MozQWidget::closeEvent(QCloseEvent* aEvent)
{
    mReceiver->OnCloseEvent(aEvent);
}

void MozQWidget::hideEvent(QHideEvent* aEvent)
{
    mReceiver->hideEvent(aEvent);
    QGraphicsWidget::hideEvent(aEvent);
}

void MozQWidget::showEvent(QShowEvent* aEvent)
{
    mReceiver->showEvent(aEvent);
    QGraphicsWidget::showEvent(aEvent);
}

bool MozQWidget::SetCursor(nsCursor aCursor)
{
    Qt::CursorShape cursor = Qt::ArrowCursor;
    switch(aCursor) {
    case eCursor_standard:
        cursor = Qt::ArrowCursor;
        break;
    case eCursor_wait:
        cursor = Qt::WaitCursor;
        break;
    case eCursor_select:
        cursor = Qt::IBeamCursor;
        break;
    case eCursor_hyperlink:
        cursor = Qt::PointingHandCursor;
        break;
    case eCursor_ew_resize:
        cursor = Qt::SplitHCursor;
        break;
    case eCursor_ns_resize:
        cursor = Qt::SplitVCursor;
        break;
    case eCursor_nw_resize:
    case eCursor_se_resize:
        cursor = Qt::SizeBDiagCursor;
        break;
    case eCursor_ne_resize:
    case eCursor_sw_resize:
        cursor = Qt::SizeFDiagCursor;
        break;
    case eCursor_crosshair:
    case eCursor_move:
        cursor = Qt::SizeAllCursor;
        break;
    case eCursor_help:
        cursor = Qt::WhatsThisCursor;
        break;
    case eCursor_copy:
    case eCursor_alias:
        break;
    case eCursor_context_menu:
    case eCursor_cell:
    case eCursor_grab:
    case eCursor_grabbing:
    case eCursor_spinning:
    case eCursor_zoom_in:
    case eCursor_zoom_out:

    default:
        break;
    }

    setCursor(cursor);

    return NS_OK;
}

bool MozQWidget::SetCursor(const QPixmap& aCursor, int aHotX, int aHotY)
{
    QCursor bitmapCursor(aCursor, aHotX, aHotY);
    setCursor(bitmapCursor);

    return NS_OK;
}

void MozQWidget::setModal(bool modal)
{
#if QT_VERSION >= 0x040600
    setPanelModality(modal ? QGraphicsItem::SceneModal : QGraphicsItem::NonModal);
#else
    LOG(("Modal QGraphicsWidgets not supported in Qt < 4.6\n"));
#endif
}

QVariant MozQWidget::inputMethodQuery(Qt::InputMethodQuery aQuery) const
{
    // The following query uses enums for the values, which are defined in
    // MeegoTouch headers, because this should also work in the pure Qt case
    // we use the values directly here. The original values are in the comments.
    if (static_cast<Qt::InputMethodQuery>(/*M::ImModeQuery*/ 10004 ) == aQuery)
    {
        return QVariant(/*M::InputMethodModeDirect*/ 1 );
    }

    return QGraphicsWidget::inputMethodQuery(aQuery);
}

/**
  Request the VKB and starts a timer with the given timeout in milliseconds.
  If the request is not canceled when the timer runs out, the VKB is actually
  shown.
*/
void MozQWidget::requestVKB(int aTimeout)
{
    if (!gPendingVKBOpen) {
        gPendingVKBOpen = true;

        if (aTimeout == 0)
            showVKB();
        else
            QTimer::singleShot(aTimeout, this, SLOT(showVKB()));
    }
}



void MozQWidget::showVKB()
{
    // skip showing of keyboard if not pending
    if (!gPendingVKBOpen)
        return;

    gPendingVKBOpen = false;

#if (QT_VERSION >= QT_VERSION_CHECK(4, 6, 0))
    QWidget* focusWidget = qApp->focusWidget();

    if (focusWidget) {
        QInputContext *inputContext = qApp->inputContext();
        if (!inputContext) {
            NS_WARNING("Requesting SIP: but no input context");
            return;
        }

        QEvent request(QEvent::RequestSoftwareInputPanel);
        inputContext->filterEvent(&request);
        focusWidget->setAttribute(Qt::WA_InputMethodEnabled, true);
        inputContext->setFocusWidget(focusWidget);
        gKeyboardOpen = true;
        gFailedOpenKeyboard = false;
    }
    else
    {
        // No focused widget yet, so we have to open the VKB later on.
        gFailedOpenKeyboard = true;
    }
#else
    LOG(("VKB not supported in Qt < 4.6\n"));
#endif
}

void MozQWidget::hideVKB()
{
    if (gPendingVKBOpen) {
        // do not really open
        gPendingVKBOpen = false;
    }

#if (QT_VERSION >= QT_VERSION_CHECK(4, 6, 0))
    QInputContext *inputContext = qApp->inputContext();
    if (!inputContext) {
        NS_WARNING("Closing SIP: but no input context");
        return;
    }

    QEvent request(QEvent::CloseSoftwareInputPanel);
    inputContext->filterEvent(&request);
    inputContext->reset();
    gKeyboardOpen = false;
#else
    LOG(("VKB not supported in Qt < 4.6\n"));
#endif
}

bool MozQWidget::isVKBOpen()
{
    return gKeyboardOpen;
}