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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 1165 insertions, 0 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativeanchors.cpp b/src/declarative/graphicsitems/qdeclarativeanchors.cpp
new file mode 100644
index 0000000000..5ff6d2c7ee
--- /dev/null
+++ b/src/declarative/graphicsitems/qdeclarativeanchors.cpp
@@ -0,0 +1,1165 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "private/qdeclarativeanchors_p_p.h"
+
+#include "qdeclarativeitem.h"
+#include "private/qdeclarativeitem_p.h"
+
+#include <qdeclarativeinfo.h>
+
+#include <QDebug>
+
+QT_BEGIN_NAMESPACE
+
+//TODO: should we cache relationships, so we don't have to check each time (parent-child or sibling)?
+//TODO: support non-parent, non-sibling (need to find lowest common ancestor)
+
+static qreal hcenter(QGraphicsItem *i)
+{
+    QGraphicsItemPrivate *item = QGraphicsItemPrivate::get(i);
+
+    qreal width = item->width();
+    int iw = width;
+    if (iw % 2)
+        return (width + 1) / 2;
+    else
+        return width / 2;
+}
+
+static qreal vcenter(QGraphicsItem *i)
+{
+    QGraphicsItemPrivate *item = QGraphicsItemPrivate::get(i);
+
+    qreal height = item->height();
+    int ih = height;
+    if (ih % 2)
+        return (height + 1) / 2;
+    else
+        return height / 2;
+}
+
+//### const item?
+//local position
+static qreal position(QGraphicsObject *item, QDeclarativeAnchorLine::AnchorLine anchorLine)
+{
+    qreal ret = 0.0;
+    QGraphicsItemPrivate *d = QGraphicsItemPrivate::get(item);
+    switch(anchorLine) {
+    case QDeclarativeAnchorLine::Left:
+        ret = item->x();
+        break;
+    case QDeclarativeAnchorLine::Right:
+        ret = item->x() + d->width();
+        break;
+    case QDeclarativeAnchorLine::Top:
+        ret = item->y();
+        break;
+    case QDeclarativeAnchorLine::Bottom:
+        ret = item->y() + d->height();
+        break;
+    case QDeclarativeAnchorLine::HCenter:
+        ret = item->x() + hcenter(item);
+        break;
+    case QDeclarativeAnchorLine::VCenter:
+        ret = item->y() + vcenter(item);
+        break;
+    case QDeclarativeAnchorLine::Baseline:
+        if (d->isDeclarativeItem)
+            ret = item->y() + static_cast<QDeclarativeItem*>(item)->baselineOffset();
+        break;
+    default:
+        break;
+    }
+
+    return ret;
+}
+
+//position when origin is 0,0
+static qreal adjustedPosition(QGraphicsObject *item, QDeclarativeAnchorLine::AnchorLine anchorLine)
+{
+    qreal ret = 0.0;
+    QGraphicsItemPrivate *d = QGraphicsItemPrivate::get(item);
+    switch(anchorLine) {
+    case QDeclarativeAnchorLine::Left:
+        ret = 0.0;
+        break;
+    case QDeclarativeAnchorLine::Right:
+        ret = d->width();
+        break;
+    case QDeclarativeAnchorLine::Top:
+        ret = 0.0;
+        break;
+    case QDeclarativeAnchorLine::Bottom:
+        ret = d->height();
+        break;
+    case QDeclarativeAnchorLine::HCenter:
+        ret = hcenter(item);
+        break;
+    case QDeclarativeAnchorLine::VCenter:
+        ret = vcenter(item);
+        break;
+    case QDeclarativeAnchorLine::Baseline:
+        if (d->isDeclarativeItem)
+            ret = static_cast<QDeclarativeItem*>(item)->baselineOffset();
+        break;
+    default:
+        break;
+    }
+
+    return ret;
+}
+
+QDeclarativeAnchors::QDeclarativeAnchors(QObject *parent)
+  : QObject(*new QDeclarativeAnchorsPrivate(0), parent)
+{
+    qFatal("QDeclarativeAnchors::QDeclarativeAnchors(QObject*) called");
+}
+
+QDeclarativeAnchors::QDeclarativeAnchors(QGraphicsObject *item, QObject *parent)
+  : QObject(*new QDeclarativeAnchorsPrivate(item), parent)
+{
+}
+
+QDeclarativeAnchors::~QDeclarativeAnchors()
+{
+    Q_D(QDeclarativeAnchors);
+    d->remDepend(d->fill);
+    d->remDepend(d->centerIn);
+    d->remDepend(d->left.item);
+    d->remDepend(d->right.item);
+    d->remDepend(d->top.item);
+    d->remDepend(d->bottom.item);
+    d->remDepend(d->vCenter.item);
+    d->remDepend(d->hCenter.item);
+    d->remDepend(d->baseline.item);
+}
+
+void QDeclarativeAnchorsPrivate::fillChanged()
+{
+    Q_Q(QDeclarativeAnchors);
+    if (!fill || !isItemComplete())
+        return;
+
+    if (updatingFill < 2) {
+        ++updatingFill;
+
+        qreal horizontalMargin = q->mirrored() ? rightMargin : leftMargin;
+
+        if (fill == item->parentItem()) {                         //child-parent
+            setItemPos(QPointF(horizontalMargin, topMargin));
+        } else if (fill->parentItem() == item->parentItem()) {   //siblings
+            setItemPos(QPointF(fill->x()+horizontalMargin, fill->y()+topMargin));
+        }
+        QGraphicsItemPrivate *fillPrivate = QGraphicsItemPrivate::get(fill);
+        setItemSize(QSizeF(fillPrivate->width()-leftMargin-rightMargin, fillPrivate->height()-topMargin-bottomMargin));
+
+        --updatingFill;
+    } else {
+        // ### Make this certain :)
+        qmlInfo(item) << QDeclarativeAnchors::tr("Possible anchor loop detected on fill.");
+    }
+
+}
+
+void QDeclarativeAnchorsPrivate::centerInChanged()
+{
+    Q_Q(QDeclarativeAnchors);
+    if (!centerIn || fill || !isItemComplete())
+        return;
+
+    if (updatingCenterIn < 2) {
+        ++updatingCenterIn;
+
+        qreal effectiveHCenterOffset = q->mirrored() ? -hCenterOffset : hCenterOffset;
+        if (centerIn == item->parentItem()) {
+            QPointF p(hcenter(item->parentItem()) - hcenter(item) + effectiveHCenterOffset,
+                      vcenter(item->parentItem()) - vcenter(item) + vCenterOffset);
+            setItemPos(p);
+
+        } else if (centerIn->parentItem() == item->parentItem()) {
+            QPointF p(centerIn->x() + hcenter(centerIn) - hcenter(item) + effectiveHCenterOffset,
+                      centerIn->y() + vcenter(centerIn) - vcenter(item) + vCenterOffset);
+            setItemPos(p);
+        }
+
+        --updatingCenterIn;
+    } else {
+        // ### Make this certain :)
+        qmlInfo(item) << QDeclarativeAnchors::tr("Possible anchor loop detected on centerIn.");
+    }
+}
+
+void QDeclarativeAnchorsPrivate::clearItem(QGraphicsObject *item)
+{
+    if (!item)
+        return;
+    if (fill == item)
+        fill = 0;
+    if (centerIn == item)
+        centerIn = 0;
+    if (left.item == item) {
+        left.item = 0;
+        usedAnchors &= ~QDeclarativeAnchors::LeftAnchor;
+    }
+    if (right.item == item) {
+        right.item = 0;
+        usedAnchors &= ~QDeclarativeAnchors::RightAnchor;
+    }
+    if (top.item == item) {
+        top.item = 0;
+        usedAnchors &= ~QDeclarativeAnchors::TopAnchor;
+    }
+    if (bottom.item == item) {
+        bottom.item = 0;
+        usedAnchors &= ~QDeclarativeAnchors::BottomAnchor;
+    }
+    if (vCenter.item == item) {
+        vCenter.item = 0;
+        usedAnchors &= ~QDeclarativeAnchors::VCenterAnchor;
+    }
+    if (hCenter.item == item) {
+        hCenter.item = 0;
+        usedAnchors &= ~QDeclarativeAnchors::HCenterAnchor;
+    }
+    if (baseline.item == item) {
+        baseline.item = 0;
+        usedAnchors &= ~QDeclarativeAnchors::BaselineAnchor;
+    }
+}
+
+void QDeclarativeAnchorsPrivate::addDepend(QGraphicsObject *item)
+{
+    if (!item)
+        return;
+    QGraphicsItemPrivate * itemPrivate = QGraphicsItemPrivate::get(item);
+    if (itemPrivate->isDeclarativeItem) {
+        QDeclarativeItemPrivate *p =
+            static_cast<QDeclarativeItemPrivate *>(QGraphicsItemPrivate::get(item));
+        p->addItemChangeListener(this, QDeclarativeItemPrivate::Geometry);
+    } else if(itemPrivate->isWidget) {
+        Q_Q(QDeclarativeAnchors);
+        QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
+        QObject::connect(widget, SIGNAL(destroyed(QObject*)), q, SLOT(_q_widgetDestroyed(QObject*)));
+        QObject::connect(widget, SIGNAL(geometryChanged()), q, SLOT(_q_widgetGeometryChanged()));
+    }
+}
+
+void QDeclarativeAnchorsPrivate::remDepend(QGraphicsObject *item)
+{
+    if (!item)
+        return;
+    QGraphicsItemPrivate * itemPrivate = QGraphicsItemPrivate::get(item);
+    if (itemPrivate->isDeclarativeItem) {
+        QDeclarativeItemPrivate *p =
+            static_cast<QDeclarativeItemPrivate *>(itemPrivate);
+        p->removeItemChangeListener(this, QDeclarativeItemPrivate::Geometry);
+    } else if(itemPrivate->isWidget) {
+        Q_Q(QDeclarativeAnchors);
+        QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
+        QObject::disconnect(widget, SIGNAL(destroyed(QObject*)), q, SLOT(_q_widgetDestroyed(QObject*)));
+        QObject::disconnect(widget, SIGNAL(geometryChanged()), q, SLOT(_q_widgetGeometryChanged()));
+    }
+}
+
+bool QDeclarativeAnchorsPrivate::isItemComplete() const
+{
+    return componentComplete;
+}
+
+void QDeclarativeAnchors::classBegin()
+{
+    Q_D(QDeclarativeAnchors);
+    d->componentComplete = false;
+}
+
+void QDeclarativeAnchors::componentComplete()
+{
+    Q_D(QDeclarativeAnchors);
+    d->componentComplete = true;
+}
+
+bool QDeclarativeAnchors::mirrored()
+{
+    Q_D(QDeclarativeAnchors);
+    QGraphicsItemPrivate * itemPrivate = QGraphicsItemPrivate::get(d->item);
+    return itemPrivate->isDeclarativeItem ? static_cast<QDeclarativeItemPrivate *>(itemPrivate)->effectiveLayoutMirror : false;
+}
+
+void QDeclarativeAnchorsPrivate::setItemHeight(qreal v)
+{
+    updatingMe = true;
+    QGraphicsItemPrivate::get(item)->setHeight(v);
+    updatingMe = false;
+}
+
+void QDeclarativeAnchorsPrivate::setItemWidth(qreal v)
+{
+    updatingMe = true;
+    QGraphicsItemPrivate::get(item)->setWidth(v);
+    updatingMe = false;
+}
+
+void QDeclarativeAnchorsPrivate::setItemX(qreal v)
+{
+    updatingMe = true;
+    item->setX(v);
+    updatingMe = false;
+}
+
+void QDeclarativeAnchorsPrivate::setItemY(qreal v)
+{
+    updatingMe = true;
+    item->setY(v);
+    updatingMe = false;
+}
+
+void QDeclarativeAnchorsPrivate::setItemPos(const QPointF &v)
+{
+    updatingMe = true;
+    item->setPos(v);
+    updatingMe = false;
+}
+
+void QDeclarativeAnchorsPrivate::setItemSize(const QSizeF &v)
+{
+    updatingMe = true;
+    if(QGraphicsItemPrivate::get(item)->isWidget)
+        static_cast<QGraphicsWidget *>(item)->resize(v);
+    else if (QGraphicsItemPrivate::get(item)->isDeclarativeItem)
+        static_cast<QDeclarativeItem *>(item)->setSize(v);
+    updatingMe = false;
+}
+
+void QDeclarativeAnchorsPrivate::updateMe()
+{
+    if (updatingMe) {
+        updatingMe = false;
+        return;
+    }
+
+    fillChanged();
+    centerInChanged();
+    updateHorizontalAnchors();
+    updateVerticalAnchors();
+}
+
+void QDeclarativeAnchorsPrivate::updateOnComplete()
+{
+    fillChanged();
+    centerInChanged();
+    updateHorizontalAnchors();
+    updateVerticalAnchors();
+}
+
+void QDeclarativeAnchorsPrivate::_q_widgetDestroyed(QObject *obj)
+{
+    clearItem(qobject_cast<QGraphicsObject*>(obj));
+}
+
+void QDeclarativeAnchorsPrivate::_q_widgetGeometryChanged()
+{
+    fillChanged();
+    centerInChanged();
+    updateHorizontalAnchors();
+    updateVerticalAnchors();
+}
+
+void QDeclarativeAnchorsPrivate::itemGeometryChanged(QDeclarativeItem *, const QRectF &newG, const QRectF &oldG)
+{
+    fillChanged();
+    centerInChanged();
+    if (newG.x() != oldG.x() || newG.width() != oldG.width())
+        updateHorizontalAnchors();
+    if (newG.y() != oldG.y() || newG.height() != oldG.height())
+        updateVerticalAnchors();
+}
+
+QGraphicsObject *QDeclarativeAnchors::fill() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->fill;
+}
+
+void QDeclarativeAnchors::setFill(QGraphicsObject *f)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->fill == f)
+        return;
+
+    if (!f) {
+        d->remDepend(d->fill);
+        d->fill = f;
+        emit fillChanged();
+        return;
+    }
+    if (f != d->item->parentItem() && f->parentItem() != d->item->parentItem()){
+        qmlInfo(d->item) << tr("Cannot anchor to an item that isn't a parent or sibling.");
+        return;
+    }
+    d->remDepend(d->fill);
+    d->fill = f;
+    d->addDepend(d->fill);
+    emit fillChanged();
+    d->fillChanged();
+}
+
+void QDeclarativeAnchors::resetFill()
+{
+    setFill(0);
+}
+
+QGraphicsObject *QDeclarativeAnchors::centerIn() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->centerIn;
+}
+
+void QDeclarativeAnchors::setCenterIn(QGraphicsObject* c)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->centerIn == c)
+        return;
+
+    if (!c) {
+        d->remDepend(d->centerIn);
+        d->centerIn = c;
+        emit centerInChanged();
+        return;
+    }
+    if (c != d->item->parentItem() && c->parentItem() != d->item->parentItem()){
+        qmlInfo(d->item) << tr("Cannot anchor to an item that isn't a parent or sibling.");
+        return;
+    }
+
+    d->remDepend(d->centerIn);
+    d->centerIn = c;
+    d->addDepend(d->centerIn);
+    emit centerInChanged();
+    d->centerInChanged();
+}
+
+void QDeclarativeAnchors::resetCenterIn()
+{
+    setCenterIn(0);
+}
+
+bool QDeclarativeAnchorsPrivate::calcStretch(const QDeclarativeAnchorLine &edge1,
+                                    const QDeclarativeAnchorLine &edge2,
+                                    qreal offset1,
+                                    qreal offset2,
+                                    QDeclarativeAnchorLine::AnchorLine line,
+                                    qreal &stretch)
+{
+    bool edge1IsParent = (edge1.item == item->parentItem());
+    bool edge2IsParent = (edge2.item == item->parentItem());
+    bool edge1IsSibling = (edge1.item->parentItem() == item->parentItem());
+    bool edge2IsSibling = (edge2.item->parentItem() == item->parentItem());
+
+    bool invalid = false;
+    if ((edge2IsParent && edge1IsParent) || (edge2IsSibling && edge1IsSibling)) {
+        stretch = (position(edge2.item, edge2.anchorLine) + offset2)
+                    - (position(edge1.item, edge1.anchorLine) + offset1);
+    } else if (edge2IsParent && edge1IsSibling) {
+        stretch = (position(edge2.item, edge2.anchorLine) + offset2)
+                    - (position(item->parentObject(), line)
+                    + position(edge1.item, edge1.anchorLine) + offset1);
+    } else if (edge2IsSibling && edge1IsParent) {
+        stretch = (position(item->parentObject(), line) + position(edge2.item, edge2.anchorLine) + offset2)
+                    - (position(edge1.item, edge1.anchorLine) + offset1);
+    } else
+        invalid = true;
+
+    return invalid;
+}
+
+void QDeclarativeAnchorsPrivate::updateVerticalAnchors()
+{
+    if (fill || centerIn || !isItemComplete())
+        return;
+
+    if (updatingVerticalAnchor < 2) {
+        ++updatingVerticalAnchor;
+        QGraphicsItemPrivate *itemPrivate = QGraphicsItemPrivate::get(item);
+        if (usedAnchors & QDeclarativeAnchors::TopAnchor) {
+            //Handle stretching
+            bool invalid = true;
+            qreal height = 0.0;
+            if (usedAnchors & QDeclarativeAnchors::BottomAnchor) {
+                invalid = calcStretch(top, bottom, topMargin, -bottomMargin, QDeclarativeAnchorLine::Top, height);
+            } else if (usedAnchors & QDeclarativeAnchors::VCenterAnchor) {
+                invalid = calcStretch(top, vCenter, topMargin, vCenterOffset, QDeclarativeAnchorLine::Top, height);
+                height *= 2;
+            }
+            if (!invalid)
+                setItemHeight(height);
+
+            //Handle top
+            if (top.item == item->parentItem()) {
+                setItemY(adjustedPosition(top.item, top.anchorLine) + topMargin);
+            } else if (top.item->parentItem() == item->parentItem()) {
+                setItemY(position(top.item, top.anchorLine) + topMargin);
+            }
+        } else if (usedAnchors & QDeclarativeAnchors::BottomAnchor) {
+            //Handle stretching (top + bottom case is handled above)
+            if (usedAnchors & QDeclarativeAnchors::VCenterAnchor) {
+                qreal height = 0.0;
+                bool invalid = calcStretch(vCenter, bottom, vCenterOffset, -bottomMargin,
+                                              QDeclarativeAnchorLine::Top, height);
+                if (!invalid)
+                    setItemHeight(height*2);
+            }
+
+            //Handle bottom
+            if (bottom.item == item->parentItem()) {
+                setItemY(adjustedPosition(bottom.item, bottom.anchorLine) - itemPrivate->height() - bottomMargin);
+            } else if (bottom.item->parentItem() == item->parentItem()) {
+                setItemY(position(bottom.item, bottom.anchorLine) - itemPrivate->height() - bottomMargin);
+            }
+        } else if (usedAnchors & QDeclarativeAnchors::VCenterAnchor) {
+            //(stetching handled above)
+
+            //Handle vCenter
+            if (vCenter.item == item->parentItem()) {
+                setItemY(adjustedPosition(vCenter.item, vCenter.anchorLine)
+                              - vcenter(item) + vCenterOffset);
+            } else if (vCenter.item->parentItem() == item->parentItem()) {
+                setItemY(position(vCenter.item, vCenter.anchorLine) - vcenter(item) + vCenterOffset);
+            }
+        } else if (usedAnchors & QDeclarativeAnchors::BaselineAnchor) {
+            //Handle baseline
+            if (baseline.item == item->parentItem()) {
+                if (itemPrivate->isDeclarativeItem)
+                    setItemY(adjustedPosition(baseline.item, baseline.anchorLine)
+                        - static_cast<QDeclarativeItem *>(item)->baselineOffset() + baselineOffset);
+            } else if (baseline.item->parentItem() == item->parentItem()) {
+                if (itemPrivate->isDeclarativeItem)
+                    setItemY(position(baseline.item, baseline.anchorLine)
+                        - static_cast<QDeclarativeItem *>(item)->baselineOffset() + baselineOffset);
+            }
+        }
+        --updatingVerticalAnchor;
+    } else {
+        // ### Make this certain :)
+        qmlInfo(item) << QDeclarativeAnchors::tr("Possible anchor loop detected on vertical anchor.");
+    }
+}
+
+inline QDeclarativeAnchorLine::AnchorLine reverseAnchorLine(QDeclarativeAnchorLine::AnchorLine anchorLine) {
+    if (anchorLine == QDeclarativeAnchorLine::Left) {
+        return QDeclarativeAnchorLine::Right;
+    } else if (anchorLine == QDeclarativeAnchorLine::Right) {
+        return QDeclarativeAnchorLine::Left;
+    } else {
+        return anchorLine;
+    }
+}
+
+void QDeclarativeAnchorsPrivate::updateHorizontalAnchors()
+{
+    Q_Q(QDeclarativeAnchors);
+    if (fill || centerIn || !isItemComplete())
+        return;
+
+    if (updatingHorizontalAnchor < 3) {
+        ++updatingHorizontalAnchor;
+        qreal effectiveRightMargin, effectiveLeftMargin, effectiveHorizontalCenterOffset;
+        QDeclarativeAnchorLine effectiveLeft, effectiveRight, effectiveHorizontalCenter;
+        QDeclarativeAnchors::Anchor effectiveLeftAnchor, effectiveRightAnchor;
+        if (q->mirrored()) {
+            effectiveLeftAnchor = QDeclarativeAnchors::RightAnchor;
+            effectiveRightAnchor = QDeclarativeAnchors::LeftAnchor;
+            effectiveLeft.item = right.item;
+            effectiveLeft.anchorLine = reverseAnchorLine(right.anchorLine);
+            effectiveRight.item = left.item;
+            effectiveRight.anchorLine = reverseAnchorLine(left.anchorLine);
+            effectiveHorizontalCenter.item = hCenter.item;
+            effectiveHorizontalCenter.anchorLine = reverseAnchorLine(hCenter.anchorLine);
+            effectiveLeftMargin = rightMargin;
+            effectiveRightMargin = leftMargin;
+            effectiveHorizontalCenterOffset = -hCenterOffset;
+        } else {
+            effectiveLeftAnchor = QDeclarativeAnchors::LeftAnchor;
+            effectiveRightAnchor = QDeclarativeAnchors::RightAnchor;
+            effectiveLeft = left;
+            effectiveRight = right;
+            effectiveHorizontalCenter = hCenter;
+            effectiveLeftMargin = leftMargin;
+            effectiveRightMargin = rightMargin;
+            effectiveHorizontalCenterOffset = hCenterOffset;
+        }
+
+        QGraphicsItemPrivate *itemPrivate = QGraphicsItemPrivate::get(item);
+        if (usedAnchors & effectiveLeftAnchor) {
+            //Handle stretching
+            bool invalid = true;
+            qreal width = 0.0;
+            if (usedAnchors & effectiveRightAnchor) {
+                invalid = calcStretch(effectiveLeft, effectiveRight, effectiveLeftMargin, -effectiveRightMargin, QDeclarativeAnchorLine::Left, width);
+            } else if (usedAnchors & QDeclarativeAnchors::HCenterAnchor) {
+                invalid = calcStretch(effectiveLeft, effectiveHorizontalCenter, effectiveLeftMargin, effectiveHorizontalCenterOffset, QDeclarativeAnchorLine::Left, width);
+                width *= 2;
+            }
+            if (!invalid)
+                setItemWidth(width);
+
+            //Handle left
+            if (effectiveLeft.item == item->parentItem()) {
+                setItemX(adjustedPosition(effectiveLeft.item, effectiveLeft.anchorLine) + effectiveLeftMargin);
+            } else if (effectiveLeft.item->parentItem() == item->parentItem()) {
+                setItemX(position(effectiveLeft.item, effectiveLeft.anchorLine) + effectiveLeftMargin);
+            }
+        } else if (usedAnchors & effectiveRightAnchor) {
+            //Handle stretching (left + right case is handled in updateLeftAnchor)
+            if (usedAnchors & QDeclarativeAnchors::HCenterAnchor) {
+                qreal width = 0.0;
+                bool invalid = calcStretch(effectiveHorizontalCenter, effectiveRight, effectiveHorizontalCenterOffset, -effectiveRightMargin,
+                                              QDeclarativeAnchorLine::Left, width);
+                if (!invalid)
+                    setItemWidth(width*2);
+            }
+
+            //Handle right
+            if (effectiveRight.item == item->parentItem()) {
+                setItemX(adjustedPosition(effectiveRight.item, effectiveRight.anchorLine) - itemPrivate->width() - effectiveRightMargin);
+            } else if (effectiveRight.item->parentItem() == item->parentItem()) {
+                setItemX(position(effectiveRight.item, effectiveRight.anchorLine) - itemPrivate->width() - effectiveRightMargin);
+            }
+        } else if (usedAnchors & QDeclarativeAnchors::HCenterAnchor) {
+            //Handle hCenter
+            if (effectiveHorizontalCenter.item == item->parentItem()) {
+                setItemX(adjustedPosition(effectiveHorizontalCenter.item, effectiveHorizontalCenter.anchorLine) - hcenter(item) + effectiveHorizontalCenterOffset);
+            } else if (effectiveHorizontalCenter.item->parentItem() == item->parentItem()) {
+                setItemX(position(effectiveHorizontalCenter.item, effectiveHorizontalCenter.anchorLine) - hcenter(item) + effectiveHorizontalCenterOffset);
+            }
+        }
+        --updatingHorizontalAnchor;
+    } else {
+        // ### Make this certain :)
+        qmlInfo(item) << QDeclarativeAnchors::tr("Possible anchor loop detected on horizontal anchor.");
+    }
+}
+
+QDeclarativeAnchorLine QDeclarativeAnchors::top() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->top;
+}
+
+void QDeclarativeAnchors::setTop(const QDeclarativeAnchorLine &edge)
+{
+    Q_D(QDeclarativeAnchors);
+    if (!d->checkVAnchorValid(edge) || d->top == edge)
+        return;
+
+    d->usedAnchors |= TopAnchor;
+
+    if (!d->checkVValid()) {
+        d->usedAnchors &= ~TopAnchor;
+        return;
+    }
+
+    d->remDepend(d->top.item);
+    d->top = edge;
+    d->addDepend(d->top.item);
+    emit topChanged();
+    d->updateVerticalAnchors();
+}
+
+void QDeclarativeAnchors::resetTop()
+{
+    Q_D(QDeclarativeAnchors);
+    d->usedAnchors &= ~TopAnchor;
+    d->remDepend(d->top.item);
+    d->top = QDeclarativeAnchorLine();
+    emit topChanged();
+    d->updateVerticalAnchors();
+}
+
+QDeclarativeAnchorLine QDeclarativeAnchors::bottom() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->bottom;
+}
+
+void QDeclarativeAnchors::setBottom(const QDeclarativeAnchorLine &edge)
+{
+    Q_D(QDeclarativeAnchors);
+    if (!d->checkVAnchorValid(edge) || d->bottom == edge)
+        return;
+
+    d->usedAnchors |= BottomAnchor;
+
+    if (!d->checkVValid()) {
+        d->usedAnchors &= ~BottomAnchor;
+        return;
+    }
+
+    d->remDepend(d->bottom.item);
+    d->bottom = edge;
+    d->addDepend(d->bottom.item);
+    emit bottomChanged();
+    d->updateVerticalAnchors();
+}
+
+void QDeclarativeAnchors::resetBottom()
+{
+    Q_D(QDeclarativeAnchors);
+    d->usedAnchors &= ~BottomAnchor;
+    d->remDepend(d->bottom.item);
+    d->bottom = QDeclarativeAnchorLine();
+    emit bottomChanged();
+    d->updateVerticalAnchors();
+}
+
+QDeclarativeAnchorLine QDeclarativeAnchors::verticalCenter() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->vCenter;
+}
+
+void QDeclarativeAnchors::setVerticalCenter(const QDeclarativeAnchorLine &edge)
+{
+    Q_D(QDeclarativeAnchors);
+    if (!d->checkVAnchorValid(edge) || d->vCenter == edge)
+        return;
+
+    d->usedAnchors |= VCenterAnchor;
+
+    if (!d->checkVValid()) {
+        d->usedAnchors &= ~VCenterAnchor;
+        return;
+    }
+
+    d->remDepend(d->vCenter.item);
+    d->vCenter = edge;
+    d->addDepend(d->vCenter.item);
+    emit verticalCenterChanged();
+    d->updateVerticalAnchors();
+}
+
+void QDeclarativeAnchors::resetVerticalCenter()
+{
+    Q_D(QDeclarativeAnchors);
+    d->usedAnchors &= ~VCenterAnchor;
+    d->remDepend(d->vCenter.item);
+    d->vCenter = QDeclarativeAnchorLine();
+    emit verticalCenterChanged();
+    d->updateVerticalAnchors();
+}
+
+QDeclarativeAnchorLine QDeclarativeAnchors::baseline() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->baseline;
+}
+
+void QDeclarativeAnchors::setBaseline(const QDeclarativeAnchorLine &edge)
+{
+    Q_D(QDeclarativeAnchors);
+    if (!d->checkVAnchorValid(edge) || d->baseline == edge)
+        return;
+
+    d->usedAnchors |= BaselineAnchor;
+
+    if (!d->checkVValid()) {
+        d->usedAnchors &= ~BaselineAnchor;
+        return;
+    }
+
+    d->remDepend(d->baseline.item);
+    d->baseline = edge;
+    d->addDepend(d->baseline.item);
+    emit baselineChanged();
+    d->updateVerticalAnchors();
+}
+
+void QDeclarativeAnchors::resetBaseline()
+{
+    Q_D(QDeclarativeAnchors);
+    d->usedAnchors &= ~BaselineAnchor;
+    d->remDepend(d->baseline.item);
+    d->baseline = QDeclarativeAnchorLine();
+    emit baselineChanged();
+    d->updateVerticalAnchors();
+}
+
+QDeclarativeAnchorLine QDeclarativeAnchors::left() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->left;
+}
+
+void QDeclarativeAnchors::setLeft(const QDeclarativeAnchorLine &edge)
+{
+    Q_D(QDeclarativeAnchors);
+    if (!d->checkHAnchorValid(edge) || d->left == edge)
+        return;
+
+    d->usedAnchors |= LeftAnchor;
+
+    if (!d->checkHValid()) {
+        d->usedAnchors &= ~LeftAnchor;
+        return;
+    }
+
+    d->remDepend(d->left.item);
+    d->left = edge;
+    d->addDepend(d->left.item);
+    emit leftChanged();
+    d->updateHorizontalAnchors();
+}
+
+void QDeclarativeAnchors::resetLeft()
+{
+    Q_D(QDeclarativeAnchors);
+    d->usedAnchors &= ~LeftAnchor;
+    d->remDepend(d->left.item);
+    d->left = QDeclarativeAnchorLine();
+    emit leftChanged();
+    d->updateHorizontalAnchors();
+}
+
+QDeclarativeAnchorLine QDeclarativeAnchors::right() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->right;
+}
+
+void QDeclarativeAnchors::setRight(const QDeclarativeAnchorLine &edge)
+{
+    Q_D(QDeclarativeAnchors);
+    if (!d->checkHAnchorValid(edge) || d->right == edge)
+        return;
+
+    d->usedAnchors |= RightAnchor;
+
+    if (!d->checkHValid()) {
+        d->usedAnchors &= ~RightAnchor;
+        return;
+    }
+
+    d->remDepend(d->right.item);
+    d->right = edge;
+    d->addDepend(d->right.item);
+    emit rightChanged();
+    d->updateHorizontalAnchors();
+}
+
+void QDeclarativeAnchors::resetRight()
+{
+    Q_D(QDeclarativeAnchors);
+    d->usedAnchors &= ~RightAnchor;
+    d->remDepend(d->right.item);
+    d->right = QDeclarativeAnchorLine();
+    emit rightChanged();
+    d->updateHorizontalAnchors();
+}
+
+QDeclarativeAnchorLine QDeclarativeAnchors::horizontalCenter() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->hCenter;
+}
+
+void QDeclarativeAnchors::setHorizontalCenter(const QDeclarativeAnchorLine &edge)
+{
+    Q_D(QDeclarativeAnchors);
+    if (!d->checkHAnchorValid(edge) || d->hCenter == edge)
+        return;
+
+    d->usedAnchors |= HCenterAnchor;
+
+    if (!d->checkHValid()) {
+        d->usedAnchors &= ~HCenterAnchor;
+        return;
+    }
+
+    d->remDepend(d->hCenter.item);
+    d->hCenter = edge;
+    d->addDepend(d->hCenter.item);
+    emit horizontalCenterChanged();
+    d->updateHorizontalAnchors();
+}
+
+void QDeclarativeAnchors::resetHorizontalCenter()
+{
+    Q_D(QDeclarativeAnchors);
+    d->usedAnchors &= ~HCenterAnchor;
+    d->remDepend(d->hCenter.item);
+    d->hCenter = QDeclarativeAnchorLine();
+    emit horizontalCenterChanged();
+    d->updateHorizontalAnchors();
+}
+
+qreal QDeclarativeAnchors::leftMargin() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->leftMargin;
+}
+
+void QDeclarativeAnchors::setLeftMargin(qreal offset)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->leftMargin == offset)
+        return;
+    d->leftMargin = offset;
+    if(d->fill)
+        d->fillChanged();
+    else
+        d->updateHorizontalAnchors();
+    emit leftMarginChanged();
+}
+
+qreal QDeclarativeAnchors::rightMargin() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->rightMargin;
+}
+
+void QDeclarativeAnchors::setRightMargin(qreal offset)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->rightMargin == offset)
+        return;
+    d->rightMargin = offset;
+    if(d->fill)
+        d->fillChanged();
+    else
+        d->updateHorizontalAnchors();
+    emit rightMarginChanged();
+}
+
+qreal QDeclarativeAnchors::margins() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->margins;
+}
+
+void QDeclarativeAnchors::setMargins(qreal offset)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->margins == offset)
+        return;
+    //###Is it significantly faster to set them directly so we can call fillChanged only once?
+    if(!d->rightMargin || d->rightMargin == d->margins)
+        setRightMargin(offset);
+    if(!d->leftMargin || d->leftMargin == d->margins)
+        setLeftMargin(offset);
+    if(!d->topMargin || d->topMargin == d->margins)
+        setTopMargin(offset);
+    if(!d->bottomMargin || d->bottomMargin == d->margins)
+        setBottomMargin(offset);
+    d->margins = offset;
+    emit marginsChanged();
+
+}
+
+qreal QDeclarativeAnchors::horizontalCenterOffset() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->hCenterOffset;
+}
+
+void QDeclarativeAnchors::setHorizontalCenterOffset(qreal offset)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->hCenterOffset == offset)
+        return;
+    d->hCenterOffset = offset;
+    if(d->centerIn)
+        d->centerInChanged();
+    else
+        d->updateHorizontalAnchors();
+    emit horizontalCenterOffsetChanged();
+}
+
+qreal QDeclarativeAnchors::topMargin() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->topMargin;
+}
+
+void QDeclarativeAnchors::setTopMargin(qreal offset)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->topMargin == offset)
+        return;
+    d->topMargin = offset;
+    if(d->fill)
+        d->fillChanged();
+    else
+        d->updateVerticalAnchors();
+    emit topMarginChanged();
+}
+
+qreal QDeclarativeAnchors::bottomMargin() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->bottomMargin;
+}
+
+void QDeclarativeAnchors::setBottomMargin(qreal offset)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->bottomMargin == offset)
+        return;
+    d->bottomMargin = offset;
+    if(d->fill)
+        d->fillChanged();
+    else
+        d->updateVerticalAnchors();
+    emit bottomMarginChanged();
+}
+
+qreal QDeclarativeAnchors::verticalCenterOffset() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->vCenterOffset;
+}
+
+void QDeclarativeAnchors::setVerticalCenterOffset(qreal offset)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->vCenterOffset == offset)
+        return;
+    d->vCenterOffset = offset;
+    if(d->centerIn)
+        d->centerInChanged();
+    else
+        d->updateVerticalAnchors();
+    emit verticalCenterOffsetChanged();
+}
+
+qreal QDeclarativeAnchors::baselineOffset() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->baselineOffset;
+}
+
+void QDeclarativeAnchors::setBaselineOffset(qreal offset)
+{
+    Q_D(QDeclarativeAnchors);
+    if (d->baselineOffset == offset)
+        return;
+    d->baselineOffset = offset;
+    d->updateVerticalAnchors();
+    emit baselineOffsetChanged();
+}
+
+QDeclarativeAnchors::Anchors QDeclarativeAnchors::usedAnchors() const
+{
+    Q_D(const QDeclarativeAnchors);
+    return d->usedAnchors;
+}
+
+bool QDeclarativeAnchorsPrivate::checkHValid() const
+{
+    if (usedAnchors & QDeclarativeAnchors::LeftAnchor &&
+        usedAnchors & QDeclarativeAnchors::RightAnchor &&
+        usedAnchors & QDeclarativeAnchors::HCenterAnchor) {
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot specify left, right, and hcenter anchors.");
+        return false;
+    }
+
+    return true;
+}
+
+bool QDeclarativeAnchorsPrivate::checkHAnchorValid(QDeclarativeAnchorLine anchor) const
+{
+    if (!anchor.item) {
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot anchor to a null item.");
+        return false;
+    } else if (anchor.anchorLine & QDeclarativeAnchorLine::Vertical_Mask) {
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot anchor a horizontal edge to a vertical edge.");
+        return false;
+    } else if (anchor.item != item->parentItem() && anchor.item->parentItem() != item->parentItem()){
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot anchor to an item that isn't a parent or sibling.");
+        return false;
+    } else if (anchor.item == item) {
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot anchor item to self.");
+        return false;
+    }
+
+    return true;
+}
+
+bool QDeclarativeAnchorsPrivate::checkVValid() const
+{
+    if (usedAnchors & QDeclarativeAnchors::TopAnchor &&
+        usedAnchors & QDeclarativeAnchors::BottomAnchor &&
+        usedAnchors & QDeclarativeAnchors::VCenterAnchor) {
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot specify top, bottom, and vcenter anchors.");
+        return false;
+    } else if (usedAnchors & QDeclarativeAnchors::BaselineAnchor &&
+               (usedAnchors & QDeclarativeAnchors::TopAnchor ||
+                usedAnchors & QDeclarativeAnchors::BottomAnchor ||
+                usedAnchors & QDeclarativeAnchors::VCenterAnchor)) {
+        qmlInfo(item) << QDeclarativeAnchors::tr("Baseline anchor cannot be used in conjunction with top, bottom, or vcenter anchors.");
+        return false;
+    }
+
+    return true;
+}
+
+bool QDeclarativeAnchorsPrivate::checkVAnchorValid(QDeclarativeAnchorLine anchor) const
+{
+    if (!anchor.item) {
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot anchor to a null item.");
+        return false;
+    } else if (anchor.anchorLine & QDeclarativeAnchorLine::Horizontal_Mask) {
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot anchor a vertical edge to a horizontal edge.");
+        return false;
+    } else if (anchor.item != item->parentItem() && anchor.item->parentItem() != item->parentItem()){
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot anchor to an item that isn't a parent or sibling.");
+        return false;
+    } else if (anchor.item == item){
+        qmlInfo(item) << QDeclarativeAnchors::tr("Cannot anchor item to self.");
+        return false;
+    }
+
+    return true;
+}
+
+QT_END_NAMESPACE
+
+#include <moc_qdeclarativeanchors_p.cpp>
+