Exemple #1
0
/*!
    Clears any cached geometry and size hint information in the layout, and
    posts a \l{QEvent::LayoutRequest}{LayoutRequest} event to the managed
    parent QGraphicsLayoutItem.

    \sa activate(), setGeometry()
*/
void QGraphicsLayout::invalidate()
{
    // only mark layouts as invalid (activated = false) if we can post a LayoutRequest event.
    QGraphicsLayoutItem *layoutItem = this;
    while (layoutItem && layoutItem->isLayout()) {
        // we could call updateGeometry(), but what if that method
        // does not call the base implementation? In addition, updateGeometry()
        // does more than we need.
        layoutItem->d_func()->sizeHintCacheDirty = true;
        layoutItem->d_func()->sizeHintWithConstraintCacheDirty = true;
        layoutItem = layoutItem->parentLayoutItem();
    }
    if (layoutItem) {
        layoutItem->d_func()->sizeHintCacheDirty = true;
        layoutItem->d_func()->sizeHintWithConstraintCacheDirty = true;
    }

    bool postIt = layoutItem ? !layoutItem->isLayout() : false;
    if (postIt) {
        layoutItem = this;
        while (layoutItem && layoutItem->isLayout()
                && static_cast<QGraphicsLayout*>(layoutItem)->d_func()->activated) {
            static_cast<QGraphicsLayout*>(layoutItem)->d_func()->activated = false;
            layoutItem = layoutItem->parentLayoutItem();
        }
        if (layoutItem && !layoutItem->isLayout()) {
            // If a layout has a parent that is not a layout it must be a QGraphicsWidget.
            QApplication::postEvent(static_cast<QGraphicsWidget *>(layoutItem), new QEvent(QEvent::LayoutRequest));
        }
    }
}
void MMessageBoxViewPrivate::updateLayout()
{
    clearLayout();
    prepareLayout();

    if (centralWidget) {
        contentsLayout->insertItem(0, centralWidget);
    }

    if (textLabel) {
        contentsLayout->insertItem(0, textLabel);
        contentsLayout->setAlignment(textLabel, Qt::AlignCenter);
    }

    if (titleLabel) {
        contentsLayout->insertItem(0, titleLabel);
        contentsLayout->setAlignment(titleLabel, Qt::AlignCenter);
    }

    if (iconImage) {
        contentsLayout->insertItem(0, iconImage);
        contentsLayout->setAlignment(iconImage, Qt::AlignCenter);
    }

    if (!QGraphicsLayout::instantInvalidatePropagation()) {
        /* Update the geometry of the parents immediately. This simply makes the layout have the correct sizehint
         * immediately instead of one frame later, removing a single frame of 'flicker'.
         */
        QGraphicsLayoutItem *item = contents;
        do {
            item->updateGeometry();
        } while( (item = item->parentLayoutItem()) );
    }
}
/*!
    Activates the layout, causing all items in the layout to be immediately
    rearranged. This function is based on calling count() and itemAt(), and
    then calling setGeometry() on all items sequentially. When activated,
    the layout will adjust its geometry to its parent's contentsRect().
    The parent will then invalidate any layout of its own.

    If called in sequence or recursively, e.g., by one of the arranged items
    in response to being resized, this function will do nothing.

    Note that the layout is free to use geometry caching to optimize this
    process.  To forcefully invalidate any such cache, you can call
    invalidate() before calling activate().

    \sa invalidate()
*/
void QGraphicsLayout::activate()
{
    Q_D(QGraphicsLayout);
    if (d->activated)
        return;

    d->activateRecursive(this);

    // we don't call activate on a sublayout, but somebody might.
    // Therefore, we walk to the parentitem of the toplevel layout.
    QGraphicsLayoutItem *parentItem = this;
    while (parentItem && parentItem->isLayout())
        parentItem = parentItem->parentLayoutItem();
    if (!parentItem)
        return;
    Q_ASSERT(!parentItem->isLayout());

    if (QGraphicsLayout::instantInvalidatePropagation()) {
        QGraphicsWidget *parentWidget = static_cast<QGraphicsWidget*>(parentItem);
        if (!parentWidget->parentLayoutItem()) {
            // we've reached the topmost widget, resize it
            bool wasResized = parentWidget->testAttribute(Qt::WA_Resized);
            parentWidget->resize(parentWidget->size());
            parentWidget->setAttribute(Qt::WA_Resized, wasResized);
        }

        setGeometry(parentItem->contentsRect());    // relayout children
    } else {
        setGeometry(parentItem->contentsRect());    // relayout children
        parentLayoutItem()->updateGeometry();
    }
}
Exemple #4
0
/*!
    Activates the layout, causing all items in the layout to be immediately
    rearranged. This function is based on calling count() and itemAt(), and
    then calling setGeometry() on all items sequentially. When activated,
    the layout will adjust its geometry to its parent's contentsRect().
    The parent will then invalidate any layout of its own.

    If called in sequence or recursively, e.g., by one of the arranged items
    in response to being resized, this function will do nothing.

    Note that the layout is free to use geometry caching to optimize this
    process.  To forcefully invalidate any such cache, you can call
    invalidate() before calling activate().

    \sa invalidate()
*/
void QGraphicsLayout::activate()
{
    Q_D(QGraphicsLayout);
    if (d->activated)
        return;

    d->activateRecursive(this);

    // we don't call activate on a sublayout, but somebody might.
    // Therefore, we walk to the parentitem of the toplevel layout.
    QGraphicsLayoutItem *parentItem = this;
    while (parentItem && parentItem->isLayout())
        parentItem = parentItem->parentLayoutItem();
    if (!parentItem)
        return;
    Q_ASSERT(!parentItem->isLayout());

    setGeometry(parentItem->contentsRect());    // relayout children
    if (!QGraphicsLayout::instantInvalidatePropagation()) {
        parentLayoutItem()->updateGeometry();
    }
}
Exemple #5
0
/*!
    Activates the layout, causing all items in the layout to be immediately
    rearranged. This function is based on calling count() and itemAt(), and
    then calling setGeometry() on all items sequentially. When activated,
    the layout will adjust its geometry to its parent's contentsRect().
    The parent will then invalidate any layout of its own.

    If called in sequence or recursively, e.g., by one of the arranged items
    in response to being resized, this function will do nothing.

    Note that the layout is free to use geometry caching to optimize this
    process.  To forcefully invalidate any such cache, you can call
    invalidate() before calling activate().

    \sa invalidate()
*/
void QGraphicsLayout::activate()
{
    Q_D(QGraphicsLayout);
    if (d->activated)
        return;

    d->activateRecursive(this);

    // we don't call activate on a sublayout, but somebody might.
    // Therefore, we walk to the parentitem of the toplevel layout.
    QGraphicsLayoutItem *parentItem = this;
    while (parentItem && parentItem->isLayout())
        parentItem = parentItem->parentLayoutItem();
    if (!parentItem)
        return;
    Q_ASSERT(!parentItem->isLayout());

    setGeometry(parentItem->contentsRect());    // relayout children

    // ### bug, should be parentItem ?
    parentLayoutItem()->updateGeometry();            // bubble up; will set activated to false
    // ### too many resizes? maybe we should walk up the chain to the
    // ### top-level layouted layoutItem and call activate there.
}