qwidgetresizehandler.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

        break;
    case TopRight:
        geom = QRect(QPoint(widget->geometry().x(), mp.y()), QPoint(p.x(), widget->geometry().bottom())) ;
        break;
    case Top:
        geom = QRect(QPoint(widget->geometry().left(), mp.y()), widget->geometry().bottomRight()) ;
        break;
    case Bottom:
        geom = QRect(widget->geometry().topLeft(), QPoint(widget->geometry().right(), p.y())) ;
        break;
    case Left:
        geom = QRect(QPoint(mp.x(), widget->geometry().top()), widget->geometry().bottomRight()) ;
        break;
    case Right:
        geom = QRect(widget->geometry().topLeft(), QPoint(p.x(), widget->geometry().bottom())) ;
        break;
    case Center:
        if (moveResizeMode)
            geom.moveTopLeft(pp);
        break;
    default:
        break;
    }

    QSize maxsize(childWidget->maximumSize());
    if (childWidget != widget)
        maxsize += QSize(2 * fw, 2 * fw + extrahei);

    geom = QRect(geom.topLeft(),
                  geom.size().expandedTo(widget->minimumSize())
                             .expandedTo(QSize(mw, mh))
                             .boundedTo(maxsize));

    if (geom != widget->geometry() &&
        (widget->isWindow() || widget->parentWidget()->rect().intersects(geom))) {
        if (widget->isMinimized())
            widget->move(geom.topLeft());
        else
            widget->setGeometry(geom);
    }

    QApplication::syncX();
}

void QWidgetResizeHandler::setMouseCursor(MousePosition m)
{
#ifdef QT_NO_CURSOR
    Q_UNUSED(m);
#else
    QObjectList children = widget->children();
    for (int i = 0; i < children.size(); ++i) {
        if (QWidget *w = qobject_cast<QWidget*>(children.at(i))) {
            if (!w->testAttribute(Qt::WA_SetCursor) && !w->inherits("QWorkspaceTitleBar")) {
                w->setCursor(Qt::ArrowCursor);
            }
        }
    }

    switch (m) {
    case TopLeft:
    case BottomRight:
        widget->setCursor(Qt::SizeFDiagCursor);
        break;
    case BottomLeft:
    case TopRight:
        widget->setCursor(Qt::SizeBDiagCursor);
        break;
    case Top:
    case Bottom:
        widget->setCursor(Qt::SizeVerCursor);
        break;
    case Left:
    case Right:
        widget->setCursor(Qt::SizeHorCursor);
        break;
    default:
        widget->setCursor(Qt::ArrowCursor);
        break;
    }
#endif // QT_NO_CURSOR
}

void QWidgetResizeHandler::keyPressEvent(QKeyEvent * e)
{
    if (!isMove() && !isResize())
        return;
    bool is_control = e->modifiers() & Qt::ControlModifier;
    int delta = is_control?1:8;
    QPoint pos = QCursor::pos();
    switch (e->key()) {
    case Qt::Key_Left:
        pos.rx() -= delta;
        if (pos.x() <= QApplication::desktop()->geometry().left()) {
            if (mode == TopLeft || mode == BottomLeft) {
                moveOffset.rx() += delta;
                invertedMoveOffset.rx() += delta;
            } else {
                moveOffset.rx() -= delta;
                invertedMoveOffset.rx() -= delta;
            }
        }
        if (isResize() && !resizeHorizontalDirectionFixed) {
            resizeHorizontalDirectionFixed = true;
            if (mode == BottomRight)
                mode = BottomLeft;
            else if (mode == TopRight)
                mode = TopLeft;
#ifndef QT_NO_CURSOR
            setMouseCursor(mode);
            widget->grabMouse(widget->cursor());
#else
            widget->grabMouse();
#endif
        }
        break;
    case Qt::Key_Right:
        pos.rx() += delta;
        if (pos.x() >= QApplication::desktop()->geometry().right()) {
            if (mode == TopRight || mode == BottomRight) {
                moveOffset.rx() += delta;
                invertedMoveOffset.rx() += delta;
            } else {
                moveOffset.rx() -= delta;
                invertedMoveOffset.rx() -= delta;
            }
        }
        if (isResize() && !resizeHorizontalDirectionFixed) {
            resizeHorizontalDirectionFixed = true;
            if (mode == BottomLeft)
                mode = BottomRight;
            else if (mode == TopLeft)
                mode = TopRight;
#ifndef QT_NO_CURSOR
            setMouseCursor(mode);
            widget->grabMouse(widget->cursor());
#else
            widget->grabMouse();
#endif
        }
        break;
    case Qt::Key_Up:
        pos.ry() -= delta;
        if (pos.y() <= QApplication::desktop()->geometry().top()) {
            if (mode == TopLeft || mode == TopRight) {
                moveOffset.ry() += delta;
                invertedMoveOffset.ry() += delta;
            } else {
                moveOffset.ry() -= delta;
                invertedMoveOffset.ry() -= delta;
            }
        }
        if (isResize() && !resizeVerticalDirectionFixed) {
            resizeVerticalDirectionFixed = true;
            if (mode == BottomLeft)
                mode = TopLeft;
            else if (mode == BottomRight)
                mode = TopRight;
#ifndef QT_NO_CURSOR
            setMouseCursor(mode);
            widget->grabMouse(widget->cursor());
#else
            widget->grabMouse();
#endif
        }
        break;
    case Qt::Key_Down:
        pos.ry() += delta;
        if (pos.y() >= QApplication::desktop()->geometry().bottom()) {
            if (mode == BottomLeft || mode == BottomRight) {
                moveOffset.ry() += delta;
                invertedMoveOffset.ry() += delta;
            } else {
                moveOffset.ry() -= delta;
                invertedMoveOffset.ry() -= delta;
            }
        }
        if (isResize() && !resizeVerticalDirectionFixed) {
            resizeVerticalDirectionFixed = true;
            if (mode == TopLeft)
                mode = BottomLeft;
            else if (mode == TopRight)
                mode = BottomRight;
#ifndef QT_NO_CURSOR
            setMouseCursor(mode);
            widget->grabMouse(widget->cursor());
#else
            widget->grabMouse();
#endif
        }
        break;
    case Qt::Key_Space:
    case Qt::Key_Return:
    case Qt::Key_Enter:
    case Qt::Key_Escape:
        moveResizeMode = false;
        widget->releaseMouse();
        widget->releaseKeyboard();
        buttonDown = false;
        break;
    default:
        return;
    }
    QCursor::setPos(pos);
}


void QWidgetResizeHandler::doResize()
{
    if (!activeForResize)
        return;

    moveResizeMode = true;
    buttonDown = true;
    moveOffset = widget->mapFromGlobal(QCursor::pos());
    if (moveOffset.x() < widget->width()/2) {
        if (moveOffset.y() < widget->height()/2)
            mode = TopLeft;
        else
            mode = BottomLeft;
    } else {
        if (moveOffset.y() < widget->height()/2)
            mode = TopRight;
        else
            mode = BottomRight;
    }
    invertedMoveOffset = widget->rect().bottomRight() - moveOffset;
#ifndef QT_NO_CURSOR
    setMouseCursor(mode);
    widget->grabMouse(widget->cursor() );
#else
    widget->grabMouse();
#endif
    widget->grabKeyboard();
    resizeHorizontalDirectionFixed = false;
    resizeVerticalDirectionFixed = false;
}

void QWidgetResizeHandler::doMove()
{
    if (!activeForMove)
        return;

    mode = Center;
    moveResizeMode = true;
    buttonDown = true;
    moveOffset = widget->mapFromGlobal(QCursor::pos());
    invertedMoveOffset = widget->rect().bottomRight() - moveOffset;
#ifndef QT_NO_CURSOR
    widget->grabMouse(Qt::SizeAllCursor);
#else
    widget->grabMouse();
#endif
    widget->grabKeyboard();
}

#endif //QT_NO_RESIZEHANDLER