qframe.cpp

奇趣公司比较新的qt/emd版本

        setAttribute(Qt::WA_WState_OwnSizePolicy, false);
    }
    d->frameStyle = (short)style;
    update();
    d->updateFrameWidth();
    d->oldFrameStyle = (short)style;
}

/*!
    \property QFrame::lineWidth
    \brief the line width

    Note that the \e total line width for frames used as separators
    (\l HLine and \l VLine) is specified by \l frameWidth.

    The default value is 1.

    \sa midLineWidth, frameWidth
*/

void QFrame::setLineWidth(int w)
{
    Q_D(QFrame);
    if (short(w) == d->lineWidth)
        return;
    d->lineWidth = short(w);
    d->updateFrameWidth();
}

int QFrame::lineWidth() const
{
    Q_D(const QFrame);
    return d->lineWidth;
}

/*!
    \property QFrame::midLineWidth
    \brief the width of the mid-line

    The default value is 0.

    \sa lineWidth, frameWidth
*/

void QFrame::setMidLineWidth(int w)
{
    Q_D(QFrame);
    if (short(w) == d->midLineWidth)
        return;
    d->midLineWidth = short(w);
    d->updateFrameWidth();
}

int QFrame::midLineWidth() const
{
    Q_D(const QFrame);
    return d->midLineWidth;
}

/*!
  \internal
  Updates the frame widths from the style.
*/
void QFramePrivate::updateStyledFrameWidths()
{
    Q_Q(const QFrame);
    QStyleOptionFrameV2 opt;
    opt.initFrom(q);
    QRect cr = q->style()->subElementRect(QStyle::SE_FrameContents, &opt, q);
    leftFrameWidth = cr.left() - opt.rect.left();
    topFrameWidth = cr.top() - opt.rect.top();
    rightFrameWidth = opt.rect.right() - cr.right(), 
    bottomFrameWidth = opt.rect.bottom() - cr.bottom();
    frameWidth = qMax(qMax(leftFrameWidth, rightFrameWidth), 
                      qMax(topFrameWidth, bottomFrameWidth));
}

/*!
  \internal
  Updated the frameWidth parameter.
*/

void QFramePrivate::updateFrameWidth()
{
    Q_Q(QFrame);
    QRect fr = q->frameRect();

    int frameShape  = frameStyle & QFrame::Shape_Mask;
    int frameShadow = frameStyle & QFrame::Shadow_Mask;

    frameWidth = -1;

    switch (frameShape) {

    case QFrame::NoFrame:
        frameWidth = 0;
        break;

    case QFrame::Box:
    case QFrame::HLine:
    case QFrame::VLine:
        switch (frameShadow) {
        case QFrame::Plain:
            frameWidth = lineWidth;
            break;
        case QFrame::Raised:
        case QFrame::Sunken:
            frameWidth = (short)(lineWidth*2 + midLineWidth);
            break;
        }
        break;

    case QFrame::StyledPanel:
        updateStyledFrameWidths();
        break;

    case QFrame::WinPanel:
        frameWidth = 2;
        break;

    case QFrame::Panel:
        switch (frameShadow) {
        case QFrame::Plain:
        case QFrame::Raised:
        case QFrame::Sunken:
            frameWidth = lineWidth;
            break;
        }
        break;
    }

    if (frameWidth == -1)                                // invalid style
        frameWidth = 0;

    q->setFrameRect(fr);

    setLayoutItemMargins(QStyle::SE_FrameLayoutItem);
}

/*!
    \property QFrame::frameWidth
    \brief the width of the frame that is drawn.

    Note that the frame width depends on the \l{QFrame::setFrameStyle()}{frame style},
    not only the line width and the mid-line width. For example, the style specified
    by \l NoFrame always has a frame width of 0, whereas the style \l Panel has a
    frame width equivalent to the line width.

    \sa lineWidth(), midLineWidth(), frameStyle()
*/
int QFrame::frameWidth() const
{
    Q_D(const QFrame);
    return d->frameWidth;
}


/*!
    \property QFrame::frameRect
    \brief the frame's rectangle

    The frame's rectangle is the rectangle the frame is drawn in. By
    default, this is the entire widget. Setting the rectangle does
    does \e not cause a widget update. The frame rectangle is
    automatically adjusted when the widget changes size.

    If you set the rectangle to a null rectangle (for example,
    QRect(0, 0, 0, 0)), then the resulting frame rectangle is
    equivalent to the \link QWidget::rect() widget rectangle\endlink.
*/

QRect QFrame::frameRect() const
{
    Q_D(const QFrame);
    QRect fr = contentsRect();
    if ((d->oldFrameStyle & QFrame::Shape_Mask) == QFrame::StyledPanel) {
        fr.adjust(-d->leftFrameWidth, -d->topFrameWidth, d->rightFrameWidth, d->bottomFrameWidth);
    } else
        fr.adjust(-d->frameWidth, -d->frameWidth, d->frameWidth, d->frameWidth);
    return fr;
}

void QFrame::setFrameRect(const QRect &r)
{
    Q_D(QFrame);
    QRect cr = r.isValid() ? r : rect();
    if ((d->frameStyle & QFrame::Shape_Mask) == StyledPanel) {
        cr.adjust(d->leftFrameWidth, d->topFrameWidth, -d->rightFrameWidth, -d->bottomFrameWidth);
    } else
        cr.adjust(d->frameWidth, d->frameWidth, -d->frameWidth, -d->frameWidth);
    setContentsMargins(cr.left(), cr.top(), rect().right() - cr.right(), rect().bottom() - cr.bottom());
}

/*!\reimp
*/
QSize QFrame::sizeHint() const
{
    Q_D(const QFrame);
    //   Returns a size hint for the frame - for HLine and VLine
    //   shapes, this is stretchable one way and 3 pixels wide the
    //   other.  For other shapes, QWidget::sizeHint() is used.
    switch (d->frameStyle & Shape_Mask) {
    case HLine:
        return QSize(-1,3);
    case VLine:
        return QSize(3,-1);
    default:
        return QWidget::sizeHint();
    }
}

/*!\reimp
*/

void QFrame::paintEvent(QPaintEvent *)
{
    QPainter paint(this);
    drawFrame(&paint);
}

/*!
    \internal

    Mostly for the sake of Q3Frame
 */
void QFrame::drawFrame(QPainter *p)
{
    Q_D(QFrame);
    QPoint      p1, p2;
    QStyleOptionFrame opt;
    opt.init(this);
    int frameShape  = d->frameStyle & QFrame::Shape_Mask;
    int frameShadow = d->frameStyle & QFrame::Shadow_Mask;

    int lw = 0;
    int mlw = 0;
    opt.rect = frameRect();
    switch (frameShape) {
    case QFrame::Box:
    case QFrame::HLine:
    case QFrame::VLine:
    case QFrame::StyledPanel:
        lw = d->lineWidth;
        mlw = d->midLineWidth;
        break;
    default:
        // most frame styles do not handle customized line and midline widths
        // (see updateFrameWidth()).
        lw = d->frameWidth;
        break;
    }
    opt.lineWidth = lw;
    opt.midLineWidth = mlw;
    if (frameShadow == Sunken)
        opt.state |= QStyle::State_Sunken;
    else if (frameShadow == Raised)
        opt.state |= QStyle::State_Raised;

    switch (frameShape) {
    case Box:
        if (frameShadow == Plain)
            qDrawPlainRect(p, opt.rect, opt.palette.foreground().color(), lw);
        else
            qDrawShadeRect(p, opt.rect, opt.palette, frameShadow == Sunken, lw, mlw);
        break;


    case StyledPanel:
        style()->drawPrimitive(QStyle::PE_Frame, &opt, p, this);
        break;

    case Panel:
        if (frameShadow == Plain)
            qDrawPlainRect(p, opt.rect, opt.palette.foreground().color(), lw);
        else
            qDrawShadePanel(p, opt.rect, opt.palette, frameShadow == Sunken, lw);
        break;

    case WinPanel:
        if (frameShadow == Plain)
            qDrawPlainRect(p, opt.rect, opt.palette.foreground().color(), lw);
        else
            qDrawWinPanel(p, opt.rect, opt.palette, frameShadow == Sunken);
        break;
    case HLine:
    case VLine:
        if (frameShape == HLine) {
            p1 = QPoint(opt.rect.x(), opt.rect.height() / 2);
            p2 = QPoint(opt.rect.x() + opt.rect.width(), p1.y());
        } else {
            p1 = QPoint(opt.rect.x()+opt.rect.width() / 2, 0);
            p2 = QPoint(p1.x(), opt.rect.height());
        }
        if (frameShadow == Plain) {
            QPen oldPen = p->pen();
            p->setPen(QPen(opt.palette.foreground().color(), lw));
            p->drawLine(p1, p2);
            p->setPen(oldPen);
        } else {
            qDrawShadeLine(p, p1, p2, opt.palette, frameShadow == Sunken, lw, mlw);
        }
        break;
    }
}


/*!\reimp
 */
void QFrame::changeEvent(QEvent *ev)
{
    Q_D(QFrame);
    if (ev->type() == QEvent::StyleChange
#ifdef Q_WS_MAC
            || ev->type() == QEvent::MacSizeChange
#endif
            )
        d->updateFrameWidth();
    QWidget::changeEvent(ev);
}

/*! \reimp */
bool QFrame::event(QEvent *e)
{
    if (e->type() == QEvent::ParentChange)
        d_func()->updateFrameWidth();
    return QWidget::event(e);
}