QGraphicsLayoutPrivate Class Reference

#include <qgraphicslayout_p.h>

Inheritance diagram for QGraphicsLayoutPrivate:

Public Functions
void	activateRecursive (QGraphicsLayoutItem *item)
void	addChildLayoutItem (QGraphicsLayoutItem *item)
	This function is called from subclasses to add a layout item layoutItem to a layout. More...
void	getMargin (qreal *result, qreal userMargin, QStyle::PixelMetric pm) const
	QGraphicsLayoutPrivate ()
void	reparentChildItems (QGraphicsItem *newParent)
Qt::LayoutDirection	visualDirection () const
Public Functions inherited from QGraphicsLayoutItemPrivate
QSizeF *	effectiveSizeHints (const QSizeF &constraint) const
void	ensureUserSizeHints ()
	Ensures that userSizeHints is allocated. More...
bool	hasHeightForWidth () const
bool	hasWidthForHeight () const
void	init ()
QGraphicsItem *	parentItem () const
	Returns the parent item of this layout, or 0 if this layout is not installed on any widget. More...
	QGraphicsLayoutItemPrivate (QGraphicsLayoutItem *parent, bool isLayout)
void	setSize (Qt::SizeHint which, const QSizeF &size)
	Sets the user size hint which to size. More...
void	setSizeComponent (Qt::SizeHint which, SizeComponent component, qreal value)
	Sets the width of the user size hint which to width. More...
virtual	~QGraphicsLayoutItemPrivate ()

Public Variables
bool	activated
qreal	bottom
qreal	left
qreal	right
qreal	top
Public Variables inherited from QGraphicsLayoutItemPrivate
QSizeF	cachedConstraint
QSizeF	cachedSizeHints [Qt::NSizeHints]
QSizeF	cachedSizeHintsWithConstraints [Qt::NSizeHints]
QRectF	geom
QGraphicsItem *	graphicsItem
quint32	isLayout: 1
quint32	ownedByLayout: 1
QGraphicsLayoutItem *	parent
QGraphicsLayoutItem *	q_ptr
quint32	sizeHintCacheDirty: 1
quint32	sizeHintWithConstraintCacheDirty: 1
QSizePolicy	sizePolicy
QSizeF *	userSizeHints

Additional Inherited Members
Public Types inherited from QGraphicsLayoutItemPrivate
enum	SizeComponent { Width, Height }
Static Public Functions inherited from QGraphicsLayoutItemPrivate
static QGraphicsLayoutItemPrivate *	get (QGraphicsLayoutItem *q)
static const QGraphicsLayoutItemPrivate *	get (const QGraphicsLayoutItem *q)

Detailed Description

Definition at line 130 of file qgraphicslayout_p.h.

Constructors and Destructors

QGraphicsLayoutPrivate()

QGraphicsLayoutPrivate::QGraphicsLayoutPrivate ( )

inline

Definition at line 135 of file qgraphicslayout_p.h.

                             : QGraphicsLayoutItemPrivate(0, true), left(-1.0), top(-1.0), right(-1.0), bottom(-1.0),
        activated(true) { }

Functions

activateRecursive()

void QGraphicsLayoutPrivate::activateRecursive

(

QGraphicsLayoutItem *

item

)

Definition at line 182 of file qgraphicslayout_p.cpp.

{
    if (item->isLayout()) {
        QGraphicsLayout *layout = static_cast<QGraphicsLayout *>(item);
        if (layout->d_func()->activated) {
            if (QGraphicsLayout::instantInvalidatePropagation()) {
                return;
            } else {
                layout->invalidate();   // ### LOOKS SUSPICIOUSLY WRONG!!???
            }
        }

        for (int i = layout->count() - 1; i >= 0; --i) {
            QGraphicsLayoutItem *childItem = layout->itemAt(i);
            if (childItem)
                activateRecursive(childItem);
        }
        layout->d_func()->activated = true;
    }
}

addChildLayoutItem()

void QGraphicsLayoutPrivate::addChildLayoutItem

(

QGraphicsLayoutItem *

layoutItem

)

This function is called from subclasses to add a layout item layoutItem to a layout.

Warning

This function is not part of the public interface.

It takes care of automatically reparenting graphics items, if needed.

If layoutItem is a is already in a layout, it will remove it from that layout.

Definition at line 150 of file qgraphicslayout_p.cpp.

Referenced by QGraphicsAnchorLayoutPrivate::addAnchor().

{
    Q_Q(QGraphicsLayout);
    if (QGraphicsLayoutItem *maybeLayout = layoutItem->parentLayoutItem()) {
        if (maybeLayout->isLayout())
            removeLayoutItemFromLayout(static_cast<QGraphicsLayout*>(maybeLayout), layoutItem);
    }
    layoutItem->setParentLayoutItem(q);
    if (layoutItem->isLayout()) {
        if (QGraphicsItem *parItem = parentItem()) {
            static_cast<QGraphicsLayout*>(layoutItem)->d_func()->reparentChildItems(parItem);
        }
    } else {
        if (QGraphicsItem *item = layoutItem->graphicsItem()) {
            QGraphicsItem *newParent = parentItem();
            QGraphicsItem *oldParent = item->parentItem();
            if (oldParent == newParent || !newParent)
                return;

#ifdef QT_DEBUG
            if (oldParent && item->isWidget()) {
                QGraphicsWidget *w = static_cast<QGraphicsWidget*>(item);
                qWarning("QGraphicsLayout::addChildLayoutItem: %s \"%s\" in wrong parent; moved to correct parent",
                    w->metaObject()->className(), w->objectName().toLocal8Bit().constData());
            }
#endif

            item->setParentItem(newParent);
        }
    }
}

getMargin()

void QGraphicsLayoutPrivate::getMargin	(	qreal *	result,
		qreal	userMargin,
		QStyle::PixelMetric	pm
	)		const

Definition at line 87 of file qgraphicslayout_p.cpp.

{
    if (!result)
        return;
    Q_Q(const QGraphicsLayout);

    QGraphicsLayoutItem *parent = q->parentLayoutItem();
    if (userMargin >= 0.0) {
        *result = userMargin;
    } else if (!parent) {
        *result = 0.0;
    } else if (parent->isLayout()) {    // sublayouts have 0 margin by default
        *result = 0.0;
    } else {
        *result = 0.0;
        if (QGraphicsItem *layoutParentItem = parentItem()) {
            if (layoutParentItem->isWidget())
                *result = (qreal)static_cast<QGraphicsWidget*>(layoutParentItem)->style()->pixelMetric(pm, 0);
        }
    }
}

reparentChildItems()

void QGraphicsLayoutPrivate::reparentChildItems

(

QGraphicsItem *

newParent

)

Warning

This function is not part of the public interface.

mw is the new parent. all items in the layout will be a child of mw.

Definition at line 58 of file qgraphicslayout_p.cpp.

{
    Q_Q(QGraphicsLayout);
    int n =  q->count();
    //bool mwVisible = mw && mw->isVisible();
    for (int i = 0; i < n; ++i) {
        QGraphicsLayoutItem *layoutChild = q->itemAt(i);
        if (!layoutChild) {
            // Skip stretch items
            continue;
        }
        if (layoutChild->isLayout()) {
            QGraphicsLayout *l = static_cast<QGraphicsLayout*>(layoutChild);
            l->d_func()->reparentChildItems(newParent);
        } else if (QGraphicsItem *itemChild = layoutChild->graphicsItem()){
            QGraphicsItem *childParent = itemChild->parentItem();
#ifdef QT_DEBUG
            if (childParent && childParent != newParent && itemChild->isWidget() && qt_graphicsLayoutDebug()) {
                QGraphicsWidget *w = static_cast<QGraphicsWidget*>(layoutChild);
                qWarning("QGraphicsLayout::addChildLayout: widget %s \"%s\" in wrong parent; moved to correct parent",
                         w->metaObject()->className(), w->objectName().toLocal8Bit().constData());
            }
#endif
            if (childParent != newParent)
                itemChild->setParentItem(newParent);
        }
    }
}

visualDirection()

Qt::LayoutDirection QGraphicsLayoutPrivate::visualDirection

(

)

const

Definition at line 109 of file qgraphicslayout_p.cpp.

Referenced by QGraphicsAnchorLayoutPrivate::setItemsGeometries().

{
    if (QGraphicsItem *maybeWidget = parentItem()) {
        if (maybeWidget->isWidget())
            return static_cast<QGraphicsWidget*>(maybeWidget)->layoutDirection();
    }
    return QApplication::layoutDirection();
}

Properties

activated

bool QGraphicsLayoutPrivate::activated

Definition at line 146 of file qgraphicslayout_p.h.

bottom

qreal QGraphicsLayoutPrivate::bottom

Definition at line 145 of file qgraphicslayout_p.h.

left

qreal QGraphicsLayoutPrivate::left

Definition at line 145 of file qgraphicslayout_p.h.

Referenced by QGraphicsAnchorLayoutPrivate::setItemsGeometries().

right

qreal QGraphicsLayoutPrivate::right

Definition at line 145 of file qgraphicslayout_p.h.

Referenced by QGraphicsAnchorLayoutPrivate::setItemsGeometries().

top

qreal QGraphicsLayoutPrivate::top

Definition at line 145 of file qgraphicslayout_p.h.

Referenced by QGraphicsAnchorLayoutPrivate::setItemsGeometries().

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The documentation for this class was generated from the following files:

• /src/gui/graphicsview/qgraphicslayout_p.h
• /src/gui/graphicsview/qgraphicslayout_p.cpp