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diff --git a/src/declarative/fx/qfxlayouts.cpp b/src/declarative/fx/qfxlayouts.cpp new file mode 100644 index 0000000..455b8a5 --- /dev/null +++ b/src/declarative/fx/qfxlayouts.cpp @@ -0,0 +1,1027 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QDebug> +#include <QCoreApplication> +#include "qml.h" +#include "qmlstate.h" +#include "qmlstategroup.h" +#include "qmlstateoperations.h" +#include "qfxperf.h" +#include "qfxlayouts.h" +#include "qfxlayouts_p.h" + + +QT_BEGIN_NAMESPACE + +/*! + \internal + \class QFxBaseLayout + \brief The QFxBaseLayout class provides a base for QFx layouts. + + To create a QFx Layout, simple subclass QFxBaseLayout and implement + doLayout(), which is automatically called when the layout might need + updating. + + It is strongly recommended that in your implementation of doLayout() + that you use the move, remove and add transitions when those conditions + arise. + + \ingroup layouts +*/ +QFxBaseLayout::QFxBaseLayout(AutoUpdateType at, QFxItem *parent) + : QFxItem(*(new QFxBaseLayoutPrivate), parent) +{ + Q_D(QFxBaseLayout); + d->init(at); +} + +QFxBaseLayout::QFxBaseLayout(QFxBaseLayoutPrivate &dd, AutoUpdateType at, QFxItem *parent) + : QFxItem(dd, parent) +{ + Q_D(QFxBaseLayout); + d->init(at); +} + +/*! + \property QFxBaseLayout::spacing + \brief the amount of spacing between items (in px) + + Note that the subclass is repsonsible for ensuring this. +*/ +int QFxBaseLayout::spacing() const +{ + Q_D(const QFxBaseLayout); + return d->_spacing; +} + +void QFxBaseLayout::setSpacing(int s) +{ + Q_D(QFxBaseLayout); + if(s==d->_spacing) + return; + d->_spacing = s; + preLayout(); +} + +/*! + \property QFxBaseLayout::margin + \brief the size of the margin around all items (in px) + +*/ +int QFxBaseLayout::margin() const +{ + Q_D(const QFxBaseLayout); + return d->_margin; +} + +void QFxBaseLayout::setMargin(int s) +{ + Q_D(QFxBaseLayout); + if(s==d->_margin) + return; + d->_margin = s; + preLayout(); +} + + +/*! + \property QFxBaseLayout::move + \brief the transition when moving an item. + + \code + <BaseLayout id="layout" y="0"> + <move> + <Transition> + <NumericAnimation properties="y" ease="easeOutBounce" /> + </Transition> + </move> + </BaseLayout> + \endcode +*/ +QmlTransition *QFxBaseLayout::move() const +{ + Q_D(const QFxBaseLayout); + return d->moveTransition; +} + +void QFxBaseLayout::setMove(QmlTransition *mt) +{ + Q_D(QFxBaseLayout); + d->moveTransition = mt; +} + +/*! + \property QFxBaseLayout::add + \brief the transition when adding an item. + + \code + <BaseLayout id="layout" y="0"> + <add> + <Transition > + <NumericAnimation target="{layout.item}" properties="opacity" from="0" to="1" duration="500" /> + </Transition> + </add> + </BaseLayout> + \endcode +*/ +QmlTransition *QFxBaseLayout::add() const +{ + Q_D(const QFxBaseLayout); + return d->addTransition; +} + +void QFxBaseLayout::setAdd(QmlTransition *add) +{ + Q_D(QFxBaseLayout); + d->addTransition = add; +} + + +/*! + \property QFxBaseLayout::remove + \brief the transition when removing an item. + + Note that the item may be 'removed' because its opacity is zero. This can make certain + transitions difficult to see. + \code + <BaseLayout id="layout" y="0"> + <remove> + <Transition > + <NumericAnimation target="{layout.item}" properties="opacity" from="1" to="0" duration="500" /> + </Transition> + </remove> + </BaseLayout> + \endcode +*/ +QmlTransition *QFxBaseLayout::remove() const +{ + Q_D(const QFxBaseLayout); + return d->removeTransition; +} + +void QFxBaseLayout::setRemove(QmlTransition *remove) +{ + Q_D(QFxBaseLayout); + d->removeTransition = remove; +} + +/*! + \property QFxBaseLayout::item + + The item that is currently being laid out. Used to target transitions that apply + only to the item being laid out, such as in the add transition. +*/ + +QFxItem *QFxBaseLayout::layoutItem() const +{ + Q_D(const QFxBaseLayout); + return d->_layoutItem; +} + +/*! + \internal +*/ +void QFxBaseLayout::setLayoutItem(QFxItem *li) +{ + Q_D(QFxBaseLayout); + if(li == d->_layoutItem) + return; + d->_layoutItem = li; + emit layoutItemChanged(); +} + +void QFxBaseLayout::componentComplete() +{ + QFxItem::componentComplete(); +#ifdef Q_ENABLE_PERFORMANCE_LOG + QFxPerfTimer<QFxPerf::BaseLayoutComponentComplete> cc; +#endif + preLayout(); +} + +void QFxBaseLayout::childrenChanged() +{ + preLayout(); +} + +bool QFxBaseLayout::event(QEvent *e) +{ + Q_D(QFxBaseLayout); + if(e->type() == QEvent::User) { + d->_ep = false; + d->_stableItems += d->_newItems; + d->_leavingItems.clear(); + d->_newItems.clear(); + return true; + } + return QFxItem::event(e); +} + +/*! + Items that have just been added to the layout. This includes invisible items + that have turned visible. +*/ +QSet<QFxItem *>* QFxBaseLayout::newItems() +{ + Q_D(QFxBaseLayout); + return &d->_newItems; +} + +/*! + Items that are visible in the layout, not including ones that have just been added. +*/ +QSet<QFxItem *>* QFxBaseLayout::items() +{ + Q_D(QFxBaseLayout); + return &d->_stableItems; +} + +/*! + Items that have just left the layout. This includes visible items + that have turned invisible. +*/ +QSet<QFxItem *>* QFxBaseLayout::leavingItems() +{ + Q_D(QFxBaseLayout); + return &d->_leavingItems; +} + +void QFxBaseLayout::preLayout() +{ + Q_D(QFxBaseLayout); + if(!isComponentComplete() || d->_movingItem) + return; + + if(!d->_ep) { + d->_ep = true; + QCoreApplication::postEvent(this, new QEvent(QEvent::User)); + } + if(d->stateGroup) { + delete d->stateGroup; d->stateGroup = 0; + } + QSet<QFxItem *> allItems; + for(int ii = 0; ii < this->QSimpleCanvasItem::children().count(); ++ii) { + QFxItem *child = qobject_cast<QFxItem *>(this->QSimpleCanvasItem::children().at(ii)); + if(!child) + continue; + if(!d->_items.contains(child)){ + QObject::connect(child, SIGNAL(visibleChanged()), + this, SLOT(preLayout())); + QObject::connect(child, SIGNAL(heightChanged()), + this, SLOT(preLayout())); + QObject::connect(child, SIGNAL(widthChanged()), + this, SLOT(preLayout())); + d->_items += child; + } + if(!child->isVisible()){ + if(d->_stableItems.contains(child)){ + d->_leavingItems += child; + d->_stableItems -= child; + } + }else if(!d->_stableItems.contains(child)){ + d->_newItems+=child; + } + allItems += child; + } + QSet<QFxItem *> deletedItems = d->_items - allItems; + foreach(QFxItem *child, d->_items){ + if(!allItems.contains(child)){ + if(!deletedItems.contains(child)) { + QObject::disconnect(child, SIGNAL(visibleChanged()), + this, SLOT(preLayout())); + QObject::disconnect(child, SIGNAL(heightChanged()), + this, SLOT(preLayout())); + QObject::disconnect(child, SIGNAL(widthChanged()), + this, SLOT(preLayout())); + } + d->_items -= child; + } + } + d->_animated.clear(); + doLayout(); + //Set the layout's size to be the rect containing all children + //Also set the margin + qreal width=0; + qreal height=0; + foreach(QFxItem *item, d->_items){ + if(item->isVisible()){ + if(!d->_animated.contains(item)){ + setMovingItem(item); + item->setPos(QPointF(item->x()+d->_margin, item->y()+d->_margin)); + setMovingItem(0); + } + width = qMax(width, item->x() + item->width()); + height = qMax(height, item->y() + item->height()); + } + } + width += d->_margin; + height+= d->_margin; + + if(d->aut & Horizontal) + setWidth(int(width)); + else + setImplicitWidth(itemParent()->width()); + if(d->aut & Vertical) + setHeight(int(height)); + else + setImplicitHeight(itemParent()->height()); + setLayoutItem(0); +} + +//###This should be considered to move more centrally, as it seems useful +void QFxBaseLayout::applyTransition(const QList<QPair<QString, QVariant> >& changes, + QFxItem* target, QmlTransition* trans) +{ + Q_D(QFxBaseLayout); + if(!trans||!target)//TODO: if !trans, just apply changes + return; + setLayoutItem(target); + if(d->stateGroup) + delete d->stateGroup; + d->stateGroup = new QmlStateGroup(this); + + QmlState *state = new QmlState; + *(d->stateGroup->statesProperty()) << state; + for(int ii=0; ii<changes.size(); ++ii){ + QmlSetProperty *sp = new QmlSetProperty(state); + sp->setObject(target); + QVariant val = changes[ii].second; + if(d->_margin && + (changes[ii].first == QLatin1String("x") || changes[ii].first == QLatin1String("y"))){ + val = QVariant(val.toInt() + d->_margin); + } + sp->setValue(val); + sp->setProperty(changes[ii].first); + *state << sp; + } + state->apply(d->stateGroup, trans, 0); + d->_animated << target; +} + +void QFxBaseLayout::setMovingItem(QFxItem *i) +{ + Q_D(QFxBaseLayout); + d->_movingItem = i; +} + +/*! + Applies the layout's add transition to the \a target item.\a changes is a list of property,value + pairs which will be changed on the target using the add transition. +*/ +void QFxBaseLayout::applyAdd(const QList<QPair<QString, QVariant> >& changes, QFxItem* target) +{ + applyTransition(changes,target, add()); +} + +/*! + Applies the layout's move transition to the \a target.\a changes is a list of property,value pairs + which will be changed on the target using the move transition. +*/ +void QFxBaseLayout::applyMove(const QList<QPair<QString, QVariant> >& changes, QFxItem* target) +{ + applyTransition(changes,target, move()); +} + +/*! + Applies the layout's remove transition to the \a target item.\a changes is a list of + property,value pairs which will be changed on the target using the remove transition. +*/ +void QFxBaseLayout::applyRemove(const QList<QPair<QString, QVariant> >& changes, QFxItem* target) +{ + applyTransition(changes,target, remove()); +} + +QML_DEFINE_TYPE(QFxVerticalLayout, VerticalLayout); +/*! + \qmlclass VerticalLayout + \brief The VerticalLayout element arranges its children in a vertical layout. + \inherits Item + + The VerticalLayout element arranges its child elements so that they are vertically + aligned and not overlapping. Spacing between items can be added, as can a margin around all the items. + + The below example lays out differently shaped rectangles using a VerticalLayout. + \table + \row + \o \image verticalLayout_example.png + \o + \code + <VerticalLayout spacing="2"> + <Rect color="red" width="50" height="50"/> + <Rect color="green" width="20" height="50"/> + <Rect color="blue" width="50" height="20"/> + </VerticalLayout> + \endcode + \endtable + + VerticalLayout also provides for transitions to be set when items are added, moved, + or removed in the layout. Adding and removing apply both to elements which are deleted + or have their position in the document changed so as to no longer be children of the layout, + as well as to elements which have their opacity set to or from zero so as to appear or disappear. + + \table + \row + \o \image verticalLayout_transition.gif + \o + \code + <VerticalLayout spacing="2"> + ... + <remove>...</remove> + <add>...</add> + <move>...</move> + </VerticalLayout> + \endcode + \endtable + + +*/ +/*! + \qmlproperty Transition VerticalLayout::remove + This property holds the transition to apply when removing an item from the layout. + + Removed can mean that either the object has been deleted or reparented, and thus is now longer a child of the layout, or that the object has had its opacity set to zero, and thus is no longer visible. + + Note that if the item counts as removed because its opacity is zero it will not be visible during the transition unless you set the opacity in the transition, like in the below example. + + \table + \row + \o \image layout-remove.gif + \o + \code + <VerticalLayout id="layout"> + <remove> + <Transition > + <NumericAnimation target="{layout.item}" + properties="opacity" from="1" to="0" + duration="500" /> + </Transition> + </remove> + </VerticalLayout> + \endcode + \endtable + +*/ +/*! + \qmlproperty Transition VerticalLayout::add + This property holds the transition to be applied when adding an item to the layout. + + Added can mean that either the object has been created or reparented, and thus is now a child or the layout, or that the object has had its opacity increased from zero, and thus is now visible. + + \table + \row + \o \image layout-add.gif + \o + \code + <VerticalLayout id="layout"> + <add> + <Transition > + <NumericAnimation target="{layout.item}" + properties="opacity" from="0" to="1" + duration="500" /> + </Transition> + </add> + </VerticalLayout> + \endcode + \endtable + +*/ +/*! + \qmlproperty Transition VerticalLayout::move + This property holds the transition to apply when moving an item within the layout. + + This can happen when other items are added or removed from the layout, or when items resize themselves. + + \table + \row + \o \image layout-move.gif + \o + \code + <VerticalLayout id="layout"> + <move> + <Transition> + <NumericAnimation properties="y" ease="easeOutBounce" /> + </Transition> + </move> + </VerticalLayout> + \endcode + \endtable +*/ +/*! + \qmlproperty Item VerticalLayout::item + + The item that is currently being laid out. Used to target transitions that apply + only to the item being laid out, such as in the add transition. + +*/ +/*! + \qmlproperty int VerticalLayout::spacing + \qmlproperty int VerticalLayout::margin + + spacing and margin allow you to control the empty space surrounding + items in layouts. + + spacing is the amount in pixels left empty between each adjacent + item. margin is the amount in pixels which will be left empty + around the inside edge of the layout. Both default to 0. + + The below example places a GridLayout containing a red, a blue and a + green rectangle on a gray background. The area the grid layout + occupies is colored white. The top layout has a spacing of 2 and a + margin of 5, the bottom layout has the defaults of no margin or + spacing. + + \image spacing_a.png + \image spacing_b.png + +*/ +/*! + \internal + \class QFxVerticalLayout + \brief The QFxVerticalLayout class lines up items vertically. + \ingroup layouts +*/ +QFxVerticalLayout::QFxVerticalLayout(QFxItem *parent) +: QFxBaseLayout(Vertical, parent) +{ +} + +void QFxVerticalLayout::doLayout() +{ + int voffset = 0; + + foreach(QFxItem* item, *leavingItems()){ + if(remove()){ + QList<QPair<QString,QVariant> > changes; + applyRemove(changes, item); + } + } + for(int ii = 0; ii < this->QSimpleCanvasItem::children().count(); ++ii) { + QFxItem *child = qobject_cast<QFxItem *>(this->QSimpleCanvasItem::children().at(ii)); + if(!child || !child->isVisible()) + continue; + + bool needMove = (child->y() != voffset || child->x()); + + QList<QPair<QString, QVariant> > changes; + changes << qMakePair(QString(QLatin1String("y")),QVariant(voffset)); + changes << qMakePair(QString(QLatin1String("x")),QVariant(0)); + if(needMove && items()->contains(child) && move()) { + applyMove(changes,child); + } else if(!items()->contains(child) && add()) { + applyAdd(changes,child); + } else if(needMove) { + setMovingItem(child); + child->setY(voffset); + setMovingItem(0); + child->setX(0); + } + voffset += child->height(); + voffset += spacing(); + } + setMovingItem(this); + setHeight(voffset); + setMovingItem(0); +} + +QML_DEFINE_TYPE(QFxHorizontalLayout,HorizontalLayout); +/*! + \qmlclass HorizontalLayout + \brief The HorizontalLayout element arranges its children in a horizontal layout. + \inherits Item + + The HorizontalLayout element arranges its child elements so that they are horizontally aligned and not overlapping. Spacing can be added between the items, and a margin around all items can also be added. It also provides for transitions to be set when items are added, moved, or removed in the layout. Adding and removing apply both to elements which are deleted or have their position in the document changed so as to no longer be children of the layout, as well as to elements which have their opacity set to or from zero so as to appear or disappear. + + The below example lays out differently shaped rectangles using a HorizontalLayout. + \code + <HorizontalLayout spacing="2"> + <Rect color="red" width="50" height="50"/> + <Rect color="green" width="20" height="50"/> + <Rect color="blue" width="50" height="20"/> + </HorizontalLayout> + \endcode + \image horizontalLayout_example.png + +*/ +/*! + \qmlproperty Transition HorizontalLayout::remove + This property holds the transition to apply when removing an item from the layout. + + Removed can mean that either the object has been deleted or reparented, and thus is now longer a child of the layout, or that the object has had its opacity set to zero, and thus is no longer visible. + + Note that if the item counts as removed because its opacity is zero it will not be visible during the transition unless you set the opacity in the transition, like in the below example. + + \code + <HorizontalLayout id="layout"> + <remove> + <Transition > + <NumericAnimation target="{layout.item}" properties="opacity" from="1" to="0" duration="500" /> + </Transition> + </remove> + </HorizontalLayout> + \endcode + +*/ +/*! + \qmlproperty Transition HorizontalLayout::add + This property holds the transition to apply when adding an item to the layout. + + Added can mean that either the object has been created or reparented, and thus is now a child or the layout, or that the object has had its opacity increased from zero, and thus is now visible. + + \code + <HorizontalLayout id="layout"> + <add> + <Transition > + <NumericAnimation target="{layout.item}" properties="opacity" from="0" to="1" duration="500" /> + </Transition> + </add> + </HorizontalLayout> + \endcode + +*/ +/*! + \qmlproperty Transition HorizontalLayout::move + This property holds the transition to apply when moving an item within the layout. + + This can happen when other items are added or removed from the layout, or when items resize themselves. + + \code + <HorizontalLayout id="layout"> + <move> + <Transition> + <NumericAnimation properties="x" ease="easeOutBounce" /> + </Transition> + </move> + </HorizontalLayout> + \endcode + +*/ +/*! + \qmlproperty Item HorizontalLayout::item + + The item that is currently being laid out. Used to target transitions that apply + only to the item being laid out, such as in the add transition. + +*/ +/*! + \qmlproperty int HorizontalLayout::spacing + + The spacing, in pixels, left empty between each adjacent item. +*/ +/*! + \qmlproperty int HorizontalLayout::margin + + The margin size, in pixels, which will be left empty around the inside edge of the layout. +*/ +/*! + \qmlproperty int HorizontalLayout::spacing + \qmlproperty int HorizontalLayout::margin + + spacing and margin allow you to control the empty space surrounding items in layouts. + + spacing is the amount in pixels left empty between each adjacent item. + margin is the amount in pixels which will be left empty around the inside edge of the layout. + Both default to 0. + + The below example places a GridLayout containing a red, a blue and a green rectangle on a gray background. The area the grid layout occupies is colored white. The top layout has a spacing of 2 and a margin of 5, the bottom layout has the defaults of no margin or spacing. + + \image spacing_a.png + \image spacing_b.png + +*/ +/*! + \internal + \class QFxHorizontalLayout + \brief The QFxHorizontalLayout class lines up items horizontally. + \ingroup layouts +*/ +QFxHorizontalLayout::QFxHorizontalLayout(QFxItem *parent) +: QFxBaseLayout(Horizontal, parent) +{ +} + +void QFxHorizontalLayout::doLayout() +{ + int hoffset = 0; + + foreach(QFxItem* item, *leavingItems()){ + if(remove()){ + QList<QPair<QString,QVariant> > changes; + applyRemove(changes, item); + } + } + for(int ii = 0; ii < this->QSimpleCanvasItem::children().count(); ++ii) { + QFxItem *child = qobject_cast<QFxItem *>(this->QSimpleCanvasItem::children().at(ii)); + if(!child || !child->isVisible()) + continue; + + bool needMove = (child->x() != hoffset || child->y()); + + QList<QPair<QString, QVariant> > changes; + changes << qMakePair(QString(QLatin1String("x")),QVariant(hoffset)); + changes << qMakePair(QString(QLatin1String("y")),QVariant(0)); + if(needMove && items()->contains(child) && move()) { + applyMove(changes,child); + } else if(!items()->contains(child) && add()) { + applyAdd(changes,child); + } else if(needMove) { + setMovingItem(child); + child->setX(hoffset); + setMovingItem(0); + child->setY(0); + } + hoffset += child->width(); + hoffset += spacing(); + } + setWidth(hoffset); +} + +QML_DEFINE_TYPE(QFxGridLayout,GridLayout); + +/*! + \qmlclass GridLayout QFxGridLayout + \brief The GridLayout element arranges its children in a grid layout. + \inherits Item + + The GridLayout element arranges its child elements so that they are + aligned in a grid and are not overlapping. Spacing can be added + between the items, and a margin around all the items can also be + defined. It also provides for transitions to be set when items are + added, moved, or removed in the layout. Adding and removing apply + both to elements which are deleted or have their position in the + document changed so as to no longer be children of the layout, as + well as to elements which have their opacity set to or from zero so + as to appear or disappear. + + The GridLayout defaults to using four columns, and as many rows as + are necessary to fit all the child elements. The number of rows + and/or the number of columns can be constrained by setting the rows + or columns properties. The grid layout calculates a grid with + rectangular cells of sufficient size to hold all items, and then + places the items in the cells, going across then down, and + positioning each item at the (0,0) corner of the cell. The below + example demonstrates this. + + \table + \row + \o \image gridLayout_example.png + \o + \code + <GridLayout columns="3" spacing="2"> + <Rect color="red" width="50" height="50"/> + <Rect color="green" width="20" height="50"/> + <Rect color="blue" width="50" height="20"/> + <Rect color="cyan" width="50" height="50"/> + <Rect color="magenta" width="10" height="10"/> + </GridLayout> + \endcode + \endtable +*/ +/*! + \qmlproperty Transition GridLayout::remove + This property holds the transition to apply when removing an item from the layout. + + Removed can mean that either the object has been deleted or + reparented, and thus is now longer a child of the layout, or that + the object has had its opacity set to zero, and thus is no longer + visible. + + Note that if the item counts as removed because its opacity is + zero it will not be visible during the transition unless you set + the opacity in the transition, like in the below example. + + \code + <GridLayout id="layout"> + <remove> + <Transition > + <NumericAnimation target="{layout.item}" properties="opacity" from="1" to="0" duration="500" /> + </Transition> + </remove> + </GridLayout> + \endcode + +*/ +/*! + \qmlproperty Transition GridLayout::add + This property holds the transition to apply when adding an item to the layout. + + Added can mean that either the object has been created or + reparented, and thus is now a child or the layout, or that the + object has had its opacity increased from zero, and thus is now + visible. + + \code + <GridLayout id="layout"> + <add> + <Transition > + <NumericAnimation target="{layout.item}" properties="opacity" from="0" to="1" duration="500" /> + </Transition> + </add> + </GridLayout> + \endcode + +*/ +/*! + \qmlproperty Transition GridLayout::move + This property holds the transition to apply when moving an item within the layout. + + This can happen when other items are added or removed from the layout, or + when items resize themselves. + + \code + <GridLayout id="layout"> + <move> + <Transition> + <NumericAnimation properties="x,y" ease="easeOutBounce" /> + </Transition> + </move> + </GridLayout> + \endcode + +*/ +/*! + \qmlproperty Item GridLayout::item + + The item that is currently being laid out. Used to target + transitions that apply only to the item being laid out, such as in + the add transition. + +*/ +/*! + \qmlproperty int GridLayout::spacing + \qmlproperty int GridLayout::margin + + spacing and margin allow you to control the empty space surrounding + items in layouts. + + spacing is the amount in pixels left empty between each adjacent + item. margin is the amount in pixels which will be left empty + around the inside edge of the layout. Both default to 0. + + The below example places a GridLayout containing a red, a blue and a + green rectangle on a gray background. The area the grid layout + occupies is colored white. The top layout has a spacing of 2 and a + margin of 5, the bottom layout has the defaults of no margin or + spacing. + + \image spacing_a.png + \image spacing_b.png + +*/ +/*! + \internal + \class QFxGridLayout + \brief The QFxGridLayout class lays out items in a grid. + \ingroup layouts + +*/ +QFxGridLayout::QFxGridLayout(QFxItem *parent) : + QFxBaseLayout(Both, parent) +{ + _columns=-1; + _rows=-1; +} + +/*! + \qmlproperty int GridLayout::columns + This property holds the number of columns in the grid. + + When the columns property is set the GridLayout will always have + that many columns. Note that if you do not have enough items to + fill this many columns some columns will be of zero width. +*/ + +/*! + \qmlproperty int GridLayout::rows + This property holds the number of rows in the grid. + + When the rows property is set the GridLayout will always have that + many rows. Note that if you do not have enough items to fill this + many rows some rows will be of zero width. +*/ + +/*! + \property QFxGridLayout::columns + \brief the number of columns in the grid. +*/ + +/*! + \property QFxGridLayout::rows + \brief the number of rows in the grid. +*/ + +void QFxGridLayout::doLayout() +{ + int c=_columns,r=_rows;//Actual number of rows/columns + int numVisible = items()->size() + newItems()->size(); + if(_columns==-1 && _rows==-1){ + c = 4; + r = (numVisible+2)/3; + }else if(_rows==-1){ + r = (numVisible+(_columns-1))/_columns; + }else if(_columns==-1){ + c = (numVisible+(_rows-1))/_rows; + } + + QList<int> maxColWidth; + QList<int> maxRowHeight; + int childIndex =0; + for(int i=0; i<r; i++){ + for(int j=0; j<c; j++){ + if(j==0) + maxRowHeight << 0; + if(i==0) + maxColWidth << 0; + if(childIndex == this->QSimpleCanvasItem::children().count()) + continue; + QFxItem *child = qobject_cast<QFxItem *>(this->QSimpleCanvasItem::children().at(childIndex++)); + if(!child || !child->isVisible()) + continue; + if(child->width() > maxColWidth[j]) + maxColWidth[j] = child->width(); + if(child->height() > maxRowHeight[i]) + maxRowHeight[i] = child->height(); + } + } + + int xoffset=0; + int yoffset=0; + int curRow =0; + int curCol =0; + foreach(QFxItem* item, *leavingItems()){ + if(remove()){ + QList<QPair<QString,QVariant> > changes; + applyRemove(changes, item); + } + } + foreach(QSimpleCanvasItem* schild, this->QSimpleCanvasItem::children()){ + QFxItem *child = qobject_cast<QFxItem *>(schild); + if(!child || !child->isVisible()) + continue; + bool needMove = (child->x()!=xoffset)||(child->y()!=yoffset); + QList<QPair<QString, QVariant> > changes; + changes << qMakePair(QString(QLatin1String("x")),QVariant(xoffset)); + changes << qMakePair(QString(QLatin1String("y")),QVariant(yoffset)); + if(newItems()->contains(child) && add()) { + applyAdd(changes,child); + } else if(needMove) { + if(move()){ + applyMove(changes,child); + }else{ + setMovingItem(child); + child->setPos(QPointF(xoffset, yoffset)); + setMovingItem(0); + } + } + xoffset+=maxColWidth[curCol]+spacing(); + curCol++; + curCol%=c; + if(!curCol){ + yoffset+=maxRowHeight[curRow]+spacing(); + xoffset=0; + curRow++; + if(curRow>=r) + return; + } + } +} + +QT_END_NAMESPACE |