qworkspace.cpp

奇趣公司比较新的qt/emd版本

    d->updateWorkspace();
    return child;
#endif
}

/*! \reimp */
void QWorkspace::childEvent(QChildEvent * e)
{
    Q_D(QWorkspace);
    if (e->removed()) {
        if (d->windows.removeAll(static_cast<QWorkspaceChild*>(e->child()))) {
            d->focus.removeAll(static_cast<QWorkspaceChild*>(e->child()));
            if (d->maxWindow == e->child())
                d->maxWindow = 0;
            d->updateWorkspace();
        }
    }
}

/*! \reimp */
#ifndef QT_NO_WHEELEVENT
void QWorkspace::wheelEvent(QWheelEvent *e)
{
    Q_D(QWorkspace);
    if (!scrollBarsEnabled())
        return;
    // the scroll bars are children of the workspace, so if we receive
    // a wheel event we redirect to the scroll bars using a direct event
    // call, /not/ using sendEvent() because if the scroll bar ignores the
    // event QApplication::sendEvent() will propagate the event to the parent widget,
    // which is us, who /just/ sent it.
    if (d->vbar && d->vbar->isVisible() && !(e->modifiers() & Qt::AltModifier))
        d->vbar->event(e);
    else if (d->hbar && d->hbar->isVisible())
        d->hbar->event(e);
}
#endif

void QWorkspacePrivate::activateWindow(QWidget* w, bool change_focus)
{
    Q_Q(QWorkspace);
    if (!w) {
        active = 0;
        emit q->windowActivated(0);
        return;
    }
    if (!q->isVisible()) {
        becomeActive = w;
        return;
    }

    if (active && active->windowWidget() == w) {
        if (!isChildOf(q->focusWidget(), w)) // child window does not have focus
            active->setActive(true);
        return;
    }

    active = 0;
    // First deactivate all other workspace clients
    QList<QWorkspaceChild *>::Iterator it(windows.begin());
    while (it != windows.end()) {
        QWorkspaceChild* c = *it;
        ++it;
        if (c->windowWidget() == w)
            active = c;
        else
            c->setActive(false);
    }

    if (!active)
        return;

    // Then activate the new one, so the focus is stored correctly
    active->setActive(true);

    if (!active)
        return;

    if (maxWindow && maxWindow != active && active->windowWidget() &&
        (active->windowWidget()->windowFlags() & Qt::WindowMaximizeButtonHint))
        active->showMaximized();

    active->internalRaise();

    if (change_focus) {
        int from = focus.indexOf(active);
        if (from >= 0)
            focus.move(from, focus.size() - 1);
    }

    updateWorkspace();
    emit q->windowActivated(w);
}


/*!
    Returns a pointer to the widget corresponding to the active child
    window, or 0 if no window is active.

    \sa setActiveWindow()
*/
QWidget* QWorkspace::activeWindow() const
{
    Q_D(const QWorkspace);
    return d->active? d->active->windowWidget() : 0;
}

/*!
    Makes the child window that contains \a w the active child window.

    \sa activeWindow()
*/
void QWorkspace::setActiveWindow(QWidget *w)
{
    Q_D(QWorkspace);
    d->activateWindow(w, true);
    if (w && w->isMinimized())
        w->setWindowState(w->windowState() & ~Qt::WindowMinimized);
}

void QWorkspacePrivate::place(QWidget *w)
{
    Q_Q(QWorkspace);

    QList<QWidget *> widgets;
    for (QList<QWorkspaceChild *>::Iterator it(windows.begin()); it != windows.end(); ++it)
        if (*it != w)
            widgets.append(*it);

    int overlap, minOverlap = 0;
    int possible;

    QRect r1(0, 0, 0, 0);
    QRect r2(0, 0, 0, 0);
    QRect maxRect = q->rect();
    int x = maxRect.left(), y = maxRect.top();
    QPoint wpos(maxRect.left(), maxRect.top());

    bool firstPass = true;

    do {
        if (y + w->height() > maxRect.bottom()) {
            overlap = -1;
        } else if(x + w->width() > maxRect.right()) {
            overlap = -2;
        } else {
            overlap = 0;

            r1.setRect(x, y, w->width(), w->height());

            QWidget *l;
            QList<QWidget *>::Iterator it(widgets.begin());
            while (it != widgets.end()) {
                l = *it;
                ++it;

                if (maxWindow == l)
                    r2 = QStyle::visualRect(q->layoutDirection(), maxRect, maxRestore);
                else
                    r2 = QStyle::visualRect(q->layoutDirection(), maxRect,
                                            QRect(l->x(), l->y(), l->width(), l->height()));

                if (r2.intersects(r1)) {
                    r2.setCoords(qMax(r1.left(), r2.left()),
                                 qMax(r1.top(), r2.top()),
                                 qMin(r1.right(), r2.right()),
                                 qMin(r1.bottom(), r2.bottom())
                                );

                    overlap += (r2.right() - r2.left()) *
                               (r2.bottom() - r2.top());
                }
            }
        }

        if (overlap == 0) {
            wpos = QPoint(x, y);
            break;
        }

        if (firstPass) {
            firstPass = false;
            minOverlap = overlap;
        } else if (overlap >= 0 && overlap < minOverlap) {
            minOverlap = overlap;
            wpos = QPoint(x, y);
        }

        if (overlap > 0) {
            possible = maxRect.right();
            if (possible - w->width() > x) possible -= w->width();

            QWidget *l;
            QList<QWidget *>::Iterator it(widgets.begin());
            while (it != widgets.end()) {
                l = *it;
                ++it;
                if (maxWindow == l)
                    r2 = QStyle::visualRect(q->layoutDirection(), maxRect, maxRestore);
                else
                    r2 = QStyle::visualRect(q->layoutDirection(), maxRect,
                                            QRect(l->x(), l->y(), l->width(), l->height()));

                if((y < r2.bottom()) && (r2.top() < w->height() + y)) {
                    if(r2.right() > x)
                        possible = possible < r2.right() ?
                                   possible : r2.right();

                    if(r2.left() - w->width() > x)
                        possible = possible < r2.left() - w->width() ?
                                   possible : r2.left() - w->width();
                }
            }

            x = possible;
        } else if (overlap == -2) {
            x = maxRect.left();
            possible = maxRect.bottom();

            if (possible - w->height() > y) possible -= w->height();

            QWidget *l;
            QList<QWidget *>::Iterator it(widgets.begin());
            while (it != widgets.end()) {
                l = *it;
                ++it;
                if (maxWindow == l)
                    r2 = QStyle::visualRect(q->layoutDirection(), maxRect, maxRestore);
                else
                    r2 = QStyle::visualRect(q->layoutDirection(), maxRect,
                                            QRect(l->x(), l->y(), l->width(), l->height()));

                if(r2.bottom() > y)
                    possible = possible < r2.bottom() ?
                               possible : r2.bottom();

                if(r2.top() - w->height() > y)
                    possible = possible < r2.top() - w->height() ?
                               possible : r2.top() - w->height();
            }

            y = possible;
        }
    }
    while(overlap != 0 && overlap != -1);

    QRect resultRect = w->geometry();
    resultRect.moveTo(wpos);
    w->setGeometry(QStyle::visualRect(q->layoutDirection(), maxRect, resultRect));
    updateWorkspace();
}


void QWorkspacePrivate::insertIcon(QWidget* w)
{
    Q_Q(QWorkspace);
    if (!w || icons.contains(w))
        return;
    icons.append(w);
    if (w->parentWidget() != q) {
        w->setParent(q, 0);
        w->move(0,0);
    }
    QRect cr = updateWorkspace();
    int x = 0;
    int y = cr.height() - w->height();

    QList<QWidget *>::Iterator it(icons.begin());
    while (it != icons.end()) {
        QWidget* i = *it;
        ++it;
        if (x > 0 && x + i->width() > cr.width()){
            x = 0;
            y -= i->height();
        }

        if (i != w &&
            i->geometry().intersects(QRect(x, y, w->width(), w->height())))
            x += i->width();
    }
    w->move(x, y);

    if (q->isVisibleTo(q->parentWidget())) {
        w->show();
        w->lower();
    }
    updateWorkspace();
}


void QWorkspacePrivate::removeIcon(QWidget* w)
{
    if (icons.removeAll(w))
        w->hide();
}


/*! \reimp  */
void QWorkspace::resizeEvent(QResizeEvent *)
{
    Q_D(QWorkspace);
    if (d->maxWindow) {
        d->maxWindow->adjustToFullscreen();
        if (d->maxWindow->windowWidget())
            d->maxWindow->windowWidget()->overrideWindowState(Qt::WindowMaximized);
    }
    d->updateWorkspace();
}

/*! \reimp */
void QWorkspace::showEvent(QShowEvent *e)
{
    Q_D(QWorkspace);
    if (d->maxWindow)
        d->showMaximizeControls();
    QWidget::showEvent(e);
    if (d->becomeActive) {
        d->activateWindow(d->becomeActive);
        d->becomeActive = 0;
    } else if (d->windows.count() > 0 && !d->active) {
        d->activateWindow(d->windows.first()->windowWidget());
    }

//     // force a frame repaint - this is a workaround for what seems to be a bug
//     // introduced when changing the QWidget::show() implementation. Might be
//     // a windows bug as well though.
//     for (int i = 0; i < d->windows.count(); ++i) {
//      QWorkspaceChild* c = d->windows.at(i);
//         c->update(c->rect());
//     }

    d->updateWorkspace();
}

/*! \reimp */
void QWorkspace::hideEvent(QHideEvent *)
{
    Q_D(QWorkspace);
    if (!isVisible())
        d->hideMaximizeControls();
}

/*! \reimp */
void QWorkspace::paintEvent(QPaintEvent *)
{
    Q_D(QWorkspace);

    if (d->background.style() != Qt::NoBrush) {
        QPainter p(this);
        p.fillRect(0, 0, width(), height(), d->background);
    }
}

void QWorkspacePrivate::minimizeWindow(QWidget* w)
{
    QWorkspaceChild* c = findChild(w);

    if (!w || !(w->windowFlags() & Qt::WindowMinimizeButtonHint))
        return;

    if (c) {
        bool wasMax = false;
        if (c == maxWindow) {
            wasMax = true;
            maxWindow = 0;
            hideMaximizeControls();
            for (QList<QWorkspaceChild *>::Iterator it(windows.begin()); it != windows.end(); ++it) {
                QWorkspaceChild* c = *it;
                if (c->titlebar)
                    c->titlebar->setMovable(true);
                c->widgetResizeHandler->setActive(true);
            }
        }
        c->hide();
        if (wasMax)
            c->setGeometry(maxRestore);
        if (!focus.contains(c))
            focus.append(c);
        insertIcon(c->iconWidget());

        if (!maxWindow)
            activateWindow(w);

        updateWorkspace();

        w->overrideWindowState(Qt::WindowMinimized);
        c->overrideWindowState(Qt::WindowMinimized);
    }
}

void QWorkspacePrivate::normalizeWindow(QWidget* w)
{
    Q_Q(QWorkspace);
    QWorkspaceChild* c = findChild(w);
    if (!w)
        return;
    if (c) {
        w->overrideWindowState(Qt::WindowNoState);
        hideMaximizeControls();
        if (!maxmenubar || q->style()->styleHint(QStyle::SH_Workspace_FillSpaceOnMaximize, 0, q) || !maxWindow) {
            if (w->minimumSize() != w->maximumSize())
                c->widgetResizeHandler->setActive(true);
            if (c->titlebar)
                c->titlebar->setMovable(true);
        }
        w->overrideWindowState(Qt::WindowNoState);
        c->overrideWindowState(Qt::WindowNoState);

        if (c == maxWindow) {
            c->setGeometry(maxRestore);
            maxWindow = 0;
        } else {
            if (c->iconw)
                removeIcon(c->iconw->parentWidget());
            c->show();
        }

        hideMaximizeControls();
        for (QList<QWorkspaceChild *>::Iterator it(windows.begin()); it != windows.end(); ++it) {
            QWorkspaceChild* c = *it;
            if (c->titlebar)
                c->titlebar->setMovable(true);
            if (c->childWidget && c->childWidget->minimumSize() != c->childWidget->maximumSize())