1 /****************************************************************************
3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4 ** All rights reserved.
5 ** Contact: Nokia Corporation (qt-info@nokia.com)
7 ** This file is part of the QtDeclarative module of the Qt Toolkit.
9 ** $QT_BEGIN_LICENSE:LGPL$
10 ** No Commercial Usage
11 ** This file contains pre-release code and may not be distributed.
12 ** You may use this file in accordance with the terms and conditions
13 ** contained in the Technology Preview License Agreement accompanying
16 ** GNU Lesser General Public License Usage
17 ** Alternatively, this file may be used under the terms of the GNU Lesser
18 ** General Public License version 2.1 as published by the Free Software
19 ** Foundation and appearing in the file LICENSE.LGPL included in the
20 ** packaging of this file. Please review the following information to
21 ** ensure the GNU Lesser General Public License version 2.1 requirements
22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
24 ** In addition, as a special exception, Nokia gives you certain additional
25 ** rights. These rights are described in the Nokia Qt LGPL Exception
26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
28 ** If you have questions regarding the use of this file, please contact
29 ** Nokia at qt-info@nokia.com.
40 ****************************************************************************/
42 #ifndef QDECLARATIVELAYOUTS_P_H
43 #define QDECLARATIVELAYOUTS_P_H
49 // This file is not part of the Qt API. It exists purely as an
50 // implementation detail. This header file may change from version to
51 // version without notice, or even be removed.
56 #include "private/qdeclarativepositioners_p.h"
58 #include "private/qdeclarativeimplicitsizeitem_p_p.h"
60 #include <qdeclarativestate_p.h>
61 #include <qdeclarativetransitionmanager_p_p.h>
62 #include <qdeclarativestateoperations_p.h>
64 #include <QtCore/QObject>
65 #include <QtCore/QString>
66 #include <QtCore/QTimer>
70 class QDeclarativeBasePositionerPrivate : public QDeclarativeImplicitSizeItemPrivate, public QDeclarativeItemChangeListener
72 Q_DECLARE_PUBLIC(QDeclarativeBasePositioner)
75 QDeclarativeBasePositionerPrivate()
76 : spacing(0), type(QDeclarativeBasePositioner::None)
77 , moveTransition(0), addTransition(0), queuedPositioning(false)
78 , doingPositioning(false), anchorConflict(false), layoutDirection(Qt::LeftToRight)
82 void init(QDeclarativeBasePositioner::PositionerType at)
89 QDeclarativeBasePositioner::PositionerType type;
90 QDeclarativeTransition *moveTransition;
91 QDeclarativeTransition *addTransition;
92 QDeclarativeStateOperation::ActionList addActions;
93 QDeclarativeStateOperation::ActionList moveActions;
94 QDeclarativeTransitionManager addTransitionManager;
95 QDeclarativeTransitionManager moveTransitionManager;
97 void watchChanges(QGraphicsObject *other);
98 void unwatchChanges(QGraphicsObject* other);
99 bool queuedPositioning : 1;
100 bool doingPositioning : 1;
101 bool anchorConflict : 1;
103 Qt::LayoutDirection layoutDirection;
106 void schedulePositioning()
108 Q_Q(QDeclarativeBasePositioner);
109 if(!queuedPositioning){
110 QTimer::singleShot(0,q,SLOT(prePositioning()));
111 queuedPositioning = true;
115 void mirrorChange() {
116 Q_Q(QDeclarativeBasePositioner);
117 if (type != QDeclarativeBasePositioner::Vertical)
120 bool isLeftToRight() const {
121 if (type == QDeclarativeBasePositioner::Vertical)
124 return effectiveLayoutMirror ? layoutDirection == Qt::RightToLeft : layoutDirection == Qt::LeftToRight;
127 virtual void itemSiblingOrderChanged(QDeclarativeItem* other)
130 //Delay is due to many children often being reordered at once
131 //And we only want to reposition them all once
132 schedulePositioning();
135 void itemGeometryChanged(QDeclarativeItem *, const QRectF &newGeometry, const QRectF &oldGeometry)
137 Q_Q(QDeclarativeBasePositioner);
138 if (newGeometry.size() != oldGeometry.size())
142 virtual void itemVisibilityChanged(QDeclarativeItem *)
144 schedulePositioning();
146 virtual void itemOpacityChanged(QDeclarativeItem *)
148 Q_Q(QDeclarativeBasePositioner);
152 void itemDestroyed(QDeclarativeItem *item)
154 Q_Q(QDeclarativeBasePositioner);
155 q->positionedItems.removeOne(QDeclarativeBasePositioner::PositionedItem(item));
158 static Qt::LayoutDirection getLayoutDirection(const QDeclarativeBasePositioner *positioner)
160 return positioner->d_func()->layoutDirection;
163 static Qt::LayoutDirection getEffectiveLayoutDirection(const QDeclarativeBasePositioner *positioner)
165 if (positioner->d_func()->effectiveLayoutMirror)
166 return positioner->d_func()->layoutDirection == Qt::RightToLeft ? Qt::LeftToRight : Qt::RightToLeft;
168 return positioner->d_func()->layoutDirection;