C++ MythUIType类代码示例

void SubtitleScreen::OptimiseDisplayedArea(void)
{
    if (!m_refreshArea)
        return;

    QRegion visible;
    QListIterator<MythUIType *> i(m_ChildrenList);
    while (i.hasNext())
    {
        MythUIType *img = i.next();
        visible = visible.united(img->GetArea());
    }

    if (visible.isEmpty())
        return;

    QRect bounding  = visible.boundingRect();
    bounding = bounding.translated(m_safeArea.topLeft());
    bounding = m_safeArea.intersected(bounding);
    int left = m_safeArea.left() - bounding.left();
    int top  = m_safeArea.top()  - bounding.top();
    SetArea(MythRect(bounding));

    i.toFront();;
    while (i.hasNext())
    {
        MythUIType *img = i.next();
        img->SetArea(img->GetArea().translated(left, top));
    }
}

bool MythUIStateType::DisplayState(const QString &name)
{
    if (name.isEmpty())
        return false;

    MythUIType *old = m_CurrentState;

    QMap<QString, MythUIType *>::Iterator i = m_ObjectsByName.find(name.toLower());

    if (i != m_ObjectsByName.end())
        m_CurrentState = i.value();
    else
        m_CurrentState = NULL;

    if (m_CurrentState != old)
    {
        if (m_ShowEmpty || m_CurrentState)
        {
            if (m_deferload && m_CurrentState)
                m_CurrentState->LoadNow();

            if (old)
                old->SetVisible(false);

            if (m_CurrentState)
                m_CurrentState->SetVisible(true);
        }
    }
    AdjustDependence();

    return (m_CurrentState != NULL);
}

/**
 *  \copydoc MythUIType::Finalize()
 */
void MythUIEditBar::Finalize(void)
{
    MythUIType *position = GetChild("position");

    if (position)
        position->MoveToTop();
}

/**
 *  \brief Copy this widgets state from another.
 */
void MythUIType::CopyFrom(MythUIType *base)
{
    m_Visible = base->m_Visible;
    m_Enabled = base->m_Enabled;
    m_CanHaveFocus = base->m_CanHaveFocus;
    m_focusOrder = base->m_focusOrder;

    SetArea(base->m_Area);
    m_MinArea = base->m_MinArea;
    m_MinSize = base->m_MinSize;
    m_Alpha = base->m_Alpha;
    m_AlphaChangeMode = base->m_AlphaChangeMode;
    m_AlphaChange = base->m_AlphaChange;
    m_AlphaMin = base->m_AlphaMin;
    m_AlphaMax = base->m_AlphaMax;

    m_Moving = base->m_Moving;
    m_XYDestination = base->m_XYDestination;
    m_XYSpeed = base->m_XYSpeed;
    m_deferload = base->m_deferload;

    QList<MythUIType *>::Iterator it;
    for (it = base->m_ChildrenList.begin(); it != base->m_ChildrenList.end();
         ++it)
    {
        MythUIType *child = GetChild((*it)->objectName());
        if (child)
            child->CopyFrom(*it);
        else
            (*it)->CreateCopy(this);
    }
}

bool MythScreenType::gestureEvent(MythGestureEvent *event)
{
    bool handled = false;
    if (event->gesture() == MythGestureEvent::Click)
    {
        switch (event->GetButton())
        {
            case MythGestureEvent::RightButton :
                ShowMenu();
                handled = true;
                break;
            default :
                break;
        }

    }

    if (!handled)
    {
        MythUIType *clicked = GetChildAt(event->GetPosition());
        if (clicked && clicked->IsEnabled())
        {
            SetFocusWidget(clicked);
            if (clicked->gestureEvent(event))
                handled = true;
        }
    }

    return handled;
}

void MythUIScrollBar::Finalize()
{
    MythUIType *slider = GetChild("slider");
    if (slider)
        m_sliderArea = slider->GetArea();

    CalculatePosition();
}

void MythUIEditBar::AddMark(MythUIShape *shape, MythUIImage *image,
                            int start, bool left)
{
    MythUIType *add = GetNew(shape, image);
    if (add)
    {
        if (left)
            start -= add->GetArea().width();
        add->SetPosition(start, add->GetArea().top());
    }
}

/**
 *  \brief Reset the widget to it's original state, should not reset changes
 *         made by the theme
 */
void MythUIType::Reset()
{
    // Reset all children
    QMutableListIterator<MythUIType *> it(m_ChildrenList);
    while (it.hasNext())
    {
        it.next();
        MythUIType *type = it.value();
        type->Reset();
    }
}

void TeletextScreen::OptimiseDisplayedArea(void)
{
    VideoOutput *vo = m_player->GetVideoOutput();
    if (!vo)
        return;
    MythPainter *osd_painter = vo->GetOSDPainter();
    if (!osd_painter)
        return;

    QHashIterator<int, QImage*> it(m_rowImages);
    while (it.hasNext())
    {
        it.next();
        MythImage* image = osd_painter->GetFormatImage();
        if (!image || !it.value())
            continue;

        int row = it.key();
        image->Assign(*(it.value()));
        MythUIImage *uiimage = new MythUIImage(this, QString("ttrow%1")
                                                        .arg(row));
        if (uiimage)
        {
            uiimage->SetImage(image);
            uiimage->SetArea(MythRect(0, row * m_rowHeight,
                                      m_safeArea.width(), m_rowHeight * 2));
        }
    }

    QRegion visible;
    QListIterator<MythUIType *> i(m_ChildrenList);
    while (i.hasNext())
    {
        MythUIType *img = i.next();
        visible = visible.united(img->GetArea());
    }

    if (visible.isEmpty())
        return;

    QRect bounding  = visible.boundingRect();
    bounding = bounding.translated(m_safeArea.topLeft());
    bounding = m_safeArea.intersected(bounding);
    int left = m_safeArea.left() - bounding.left();
    int top  = m_safeArea.top()  - bounding.top();
    SetArea(MythRect(bounding));

    i.toFront();;
    while (i.hasNext())
    {
        MythUIType *img = i.next();
        img->SetArea(img->GetArea().translated(left, top));
    }
}

void MythUIScrollBar::CalculatePosition(void)
{
    if (m_maximum > 0)
        Show();
    else
    {
        Hide();
        return;
    }

    MythUIType *slider = GetChild("slider");

    if (!slider)
    {
        LOG(VB_GENERAL, LOG_ERR, "Slider element doesn't exist");
        return;
    }

    float percentage = (float)m_sliderPosition / m_maximum;
    float relativeSize = (float)m_pageStep / (m_maximum + m_pageStep);

    MythRect newSliderArea = slider->GetArea();
    MythRect fillArea = GetArea();
    QPoint endPos(newSliderArea.left(), newSliderArea.top());

    if (m_layout == LayoutHorizontal)
    {
        int width = qMax((int)(fillArea.width() * relativeSize + 0.5),
                         m_sliderArea.width());
        newSliderArea.setWidth(width);
        endPos.setX((int)((fillArea.width() - width) * percentage + 0.5));
    }
    else
    {
        int height = qMax((int)(fillArea.height() * relativeSize + 0.5),
                          m_sliderArea.height());
        newSliderArea.setHeight(height);
        endPos.setY((int)((fillArea.height() - height) * percentage + 0.5));
    }

    slider->SetArea(newSliderArea);
    slider->SetPosition(endPos);

    if (m_hideDelay > 0)
    {
        if (m_timerId)
            killTimer(m_timerId);
        m_timerId = startTimer(m_hideDelay);

        AdjustAlpha(1, 10, 0, 255);
    }
}

void ZMEvents::setGridLayout(int layout)
{
    if (layout < 1 || layout > 3)
        layout = 1;

    if (layout == m_layout)
        return;

    if (m_eventGrid)
        m_eventGrid->Reset();

    m_layout = layout;

    // iterate though the children showing/hiding them as appropriate
    QString name;
    QString layoutName = QString("layout%1").arg(layout);
    QList<MythUIType *> *children = GetAllChildren();

    for (int x = 0; x < children->size(); x++)
    {
        MythUIType *type = children->at(x);
        name = type->objectName();
        if (name.startsWith("layout"))
        {
            if (name.startsWith(layoutName))
                type->SetVisible(true);
            else
                type->SetVisible(false);
        }
    }

    // get the correct grid
    m_eventGrid = dynamic_cast<MythUIButtonList *> (GetChild(layoutName + "_eventlist"));

    if (m_eventGrid)
    {
        connect(m_eventGrid, SIGNAL(itemSelected( MythUIButtonListItem*)),
                this, SLOT(eventChanged(MythUIButtonListItem*)));
        connect(m_eventGrid, SIGNAL(itemClicked( MythUIButtonListItem*)),
                this, SLOT(playPressed()));
        connect(m_eventGrid, SIGNAL(itemVisible(MythUIButtonListItem*)),
             this, SLOT(eventVisible(MythUIButtonListItem*)));

        updateUIList();

        BuildFocusList();

        SetFocusWidget(m_eventGrid);
    }
    else
    {

void MythUIStateType::CopyFrom(MythUIType *base)
{
    MythUIStateType *st = dynamic_cast<MythUIStateType *>(base);

    if (!st)
        return;

    m_ShowEmpty = st->m_ShowEmpty;

    MythUIType::CopyFrom(base);

    QMap<QString, MythUIType *>::iterator i;

    for (i = st->m_ObjectsByName.begin(); i != st->m_ObjectsByName.end(); ++i)
    {
        MythUIType *other = i.value();
        QString key = i.key();

        MythUIType *newtype = GetChild(other->objectName());
        AddObject(key, newtype);
        newtype->SetVisible(false);
    }

    QMap<int, MythUIType *>::iterator j;

    for (j = st->m_ObjectsByState.begin(); j != st->m_ObjectsByState.end(); ++j)
    {
        MythUIType *other = j.value();
        int key = j.key();

        MythUIType *newtype = GetChild(other->objectName());
        AddObject((StateType)key, newtype);
        newtype->SetVisible(false);
    }
}

/** \brief Return the first MythUIType which accepts focus found at the given
 *         coordinates
 *
 *  \param p QPoint coordinates
 *  \param recursive Whether to perform a recursive search
 *
 *  \return The widget at these coordinates
 */
MythUIType *MythUIType::GetChildAt(const QPoint &p, bool recursive,
                                   bool focusable) const
{
    if (GetArea().contains(p))
    {
        if (!IsVisible() || !IsEnabled())
            return NULL;

        if (m_ChildrenList.isEmpty())
            return NULL;

        /* check all children */
        QList<MythUIType *>::const_iterator it;

        for (it = m_ChildrenList.end() - 1; it != m_ChildrenList.begin() - 1; --it)
        {
            if (!(*it))
                continue;

            // If this point doesn't fall within the child's area then move on
            // This requires that the area is actually accurate and in some
            // cases this still isn't true
            if (!(*it)->GetArea().contains(p - GetArea().topLeft()))
                continue;


            MythUIType *child = *it;

            if (recursive && (focusable && !child->CanTakeFocus()))
                child = child->GetChildAt(p - GetArea().topLeft(), recursive,
                                          focusable);

            if (child)
            {
                // NOTE: Assumes no selectible ui type will contain another
                // selectible ui type.
                if (focusable && !child->CanTakeFocus())
                    continue;

                return child;
            }
        }
    }

    return NULL;
}

/** \brief Return the first MythUIType which accepts focus found at the given
 *         coordinates
 *
 *  \param p QPoint coordinates
 *  \param recursive Whether to perform a recursive search
 *
 *  \return The widget at these coordinates
 */
MythUIType *MythUIType::GetChildAt(const QPoint &p, bool recursive,
                                   bool focusable) const
{
    if (GetArea().contains(p))
    {
        if (!IsVisible() || !IsEnabled())
            return NULL;

        if (m_ChildrenList.isEmpty())
            return NULL;

        /* check all children */
        QList<MythUIType *>::const_iterator it;

        for (it = m_ChildrenList.end() - 1; it != m_ChildrenList.begin() - 1; --it)
        {
            if (!(*it))
                continue;

            MythUIType *child = NULL;


            if ((*it)->GetArea().contains(p - GetArea().topLeft()))
                child = *it;

            if (!child && recursive)
                child = (*it)->GetChildAt(p - GetArea().topLeft(), recursive,
                                          focusable);

            if (child)
            {
                // NOTE: Assumes no selectible ui type will contain another
                // selectible ui type.
                if (focusable && !child->CanTakeFocus())
                    continue;

                return child;
            }
        }
    }

    return NULL;
}

bool MythScreenType::SetFocusWidget(MythUIType *widget)
{ 
    if (!widget || !widget->IsVisible())
    {
        QMap<int, MythUIType *>::iterator it = m_FocusWidgetList.begin();
        MythUIType *current;

        while (it != m_FocusWidgetList.end())
        {
            current = *it;

            if (current->CanTakeFocus() && current->IsVisible())
            {
                widget = current;
                break;
            }
            ++it;
        }
    }

    if (!widget)
        return false;

    if (m_CurrentFocusWidget == widget)
        return true;
    
    MythUIText *helpText = dynamic_cast<MythUIText *>(GetChild("helptext"));
    if (helpText)
        helpText->Reset();

    if (m_CurrentFocusWidget)
        m_CurrentFocusWidget->LoseFocus();
    m_CurrentFocusWidget = widget;
    m_CurrentFocusWidget->TakeFocus();

    if (helpText && !widget->GetHelpText().isEmpty())
        helpText->SetText(widget->GetHelpText());

    return true;
}