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Diffstat (limited to 'src/declarative/graphicsitems/qmlgraphicsgridview.cpp')
| -rw-r--r-- | src/declarative/graphicsitems/qmlgraphicsgridview.cpp | 1723 |
1 files changed, 0 insertions, 1723 deletions
diff --git a/src/declarative/graphicsitems/qmlgraphicsgridview.cpp b/src/declarative/graphicsitems/qmlgraphicsgridview.cpp deleted file mode 100644 index bf370ae..0000000 --- a/src/declarative/graphicsitems/qmlgraphicsgridview.cpp +++ /dev/null @@ -1,1723 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2010 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 "qmlgraphicsgridview_p.h" - -#include "qmlgraphicsvisualitemmodel_p.h" -#include "qmlgraphicsflickable_p_p.h" - -#include <qmleasefollow_p.h> - -#include <qlistmodelinterface_p.h> -#include <QKeyEvent> - -QT_BEGIN_NAMESPACE - -QHash<QObject*, QmlGraphicsGridViewAttached*> QmlGraphicsGridViewAttached::attachedProperties; - - -//---------------------------------------------------------------------------- - -class FxGridItem -{ -public: - FxGridItem(QmlGraphicsItem *i, QmlGraphicsGridView *v) : item(i), view(v) { - attached = QmlGraphicsGridViewAttached::properties(item); - attached->m_view = view; - } - ~FxGridItem() {} - - qreal rowPos() const { return (view->flow() == QmlGraphicsGridView::LeftToRight ? item->y() : item->x()); } - qreal colPos() const { return (view->flow() == QmlGraphicsGridView::LeftToRight ? item->x() : item->y()); } - qreal endRowPos() const { - return view->flow() == QmlGraphicsGridView::LeftToRight - ? item->y() + view->cellHeight() - 1 - : item->x() + view->cellWidth() - 1; - } - void setPosition(qreal col, qreal row) { - if (view->flow() == QmlGraphicsGridView::LeftToRight) { - item->setPos(QPointF(col, row)); - } else { - item->setPos(QPointF(row, col)); - } - } - - QmlGraphicsItem *item; - QmlGraphicsGridView *view; - QmlGraphicsGridViewAttached *attached; - int index; -}; - -//---------------------------------------------------------------------------- - -class QmlGraphicsGridViewPrivate : public QmlGraphicsFlickablePrivate -{ - Q_DECLARE_PUBLIC(QmlGraphicsGridView) - -public: - QmlGraphicsGridViewPrivate() - : currentItem(0), flow(QmlGraphicsGridView::LeftToRight) - , visiblePos(0), visibleIndex(0) , currentIndex(-1) - , cellWidth(100), cellHeight(100), columns(1), requestedIndex(-1) - , highlightComponent(0), highlight(0), trackedItem(0) - , moveReason(Other), buffer(0), highlightXAnimator(0), highlightYAnimator(0) - , bufferMode(NoBuffer) - , ownModel(false), wrap(false), autoHighlight(true) - , fixCurrentVisibility(false), lazyRelease(false), layoutScheduled(false) - , deferredRelease(false) {} - - void init(); - void clear(); - FxGridItem *createItem(int modelIndex); - void releaseItem(FxGridItem *item); - void refill(qreal from, qreal to, bool doBuffer=false); - - void updateGrid(); - void scheduleLayout(); - void layout(bool removed=false); - void updateUnrequestedIndexes(); - void updateUnrequestedPositions(); - void updateTrackedItem(); - void createHighlight(); - void updateHighlight(); - void updateCurrent(int modelIndex); - - FxGridItem *visibleItem(int modelIndex) const { - if (modelIndex >= visibleIndex && modelIndex < visibleIndex + visibleItems.count()) { - for (int i = modelIndex - visibleIndex; i < visibleItems.count(); ++i) { - FxGridItem *item = visibleItems.at(i); - if (item->index == modelIndex) - return item; - } - } - return 0; - } - - qreal position() const { - Q_Q(const QmlGraphicsGridView); - return flow == QmlGraphicsGridView::LeftToRight ? q->viewportY() : q->viewportX(); - } - void setPosition(qreal pos) { - Q_Q(QmlGraphicsGridView); - if (flow == QmlGraphicsGridView::LeftToRight) - q->setViewportY(pos); - else - q->setViewportX(pos); - } - int size() const { - Q_Q(const QmlGraphicsGridView); - return flow == QmlGraphicsGridView::LeftToRight ? q->height() : q->width(); - } - qreal startPosition() const { - qreal pos = 0; - if (!visibleItems.isEmpty()) - pos = visibleItems.first()->rowPos() - visibleIndex / columns * rowSize(); - return pos; - } - - qreal endPosition() const { - qreal pos = 0; - if (model && model->count()) - pos = rowPosAt(model->count() - 1) + rowSize(); - return pos; - } - - bool isValid() const { - return model && model->count() && model->isValid(); - } - - int rowSize() const { - return flow == QmlGraphicsGridView::LeftToRight ? cellHeight : cellWidth; - } - int colSize() const { - return flow == QmlGraphicsGridView::LeftToRight ? cellWidth : cellHeight; - } - - qreal colPosAt(int modelIndex) const { - if (FxGridItem *item = visibleItem(modelIndex)) - return item->colPos(); - if (!visibleItems.isEmpty()) { - if (modelIndex < visibleIndex) { - int count = (visibleIndex - modelIndex) % columns; - int col = visibleItems.first()->colPos() / colSize(); - col = (columns - count + col) % columns; - return col * colSize(); - } else { - int count = columns - 1 - (modelIndex - visibleItems.last()->index - 1) % columns; - return visibleItems.last()->colPos() - count * colSize(); - } - } else { - return (modelIndex % columns) * colSize(); - } - return 0; - } - qreal rowPosAt(int modelIndex) const { - if (FxGridItem *item = visibleItem(modelIndex)) - return item->rowPos(); - if (!visibleItems.isEmpty()) { - if (modelIndex < visibleIndex) { - int firstCol = visibleItems.first()->colPos() / colSize(); - int col = visibleIndex - modelIndex + (columns - firstCol - 1); - int rows = col / columns; - return visibleItems.first()->rowPos() - rows * rowSize(); - } else { - int count = modelIndex - visibleItems.last()->index; - int col = visibleItems.last()->colPos() + count * colSize(); - int rows = col / (columns * colSize()); - return visibleItems.last()->rowPos() + rows * rowSize(); - } - } else { - return (modelIndex / columns) * rowSize(); - } - return 0; - } - - FxGridItem *firstVisibleItem() const { - const qreal pos = position(); - for (int i = 0; i < visibleItems.count(); ++i) { - FxGridItem *item = visibleItems.at(i); - if (item->index != -1 && item->endRowPos() > pos) - return item; - } - return visibleItems.count() ? visibleItems.first() : 0; - } - - // Map a model index to visibleItems list index. - // These may differ if removed items are still present in the visible list, - // e.g. doing a removal animation - int mapFromModel(int modelIndex) const { - if (modelIndex < visibleIndex || modelIndex >= visibleIndex + visibleItems.count()) - return -1; - for (int i = 0; i < visibleItems.count(); ++i) { - FxGridItem *listItem = visibleItems.at(i); - if (listItem->index == modelIndex) - return i + visibleIndex; - if (listItem->index > modelIndex) - return -1; - } - return -1; // Not in visibleList - } - - // for debugging only - void checkVisible() const { - int skip = 0; - for (int i = 0; i < visibleItems.count(); ++i) { - FxGridItem *listItem = visibleItems.at(i); - if (listItem->index == -1) { - ++skip; - } else if (listItem->index != visibleIndex + i - skip) { - for (int j = 0; j < visibleItems.count(); j++) - qDebug() << " index" << j << "item index" << visibleItems.at(j)->index; - qFatal("index %d %d %d", visibleIndex, i, listItem->index); - } - } - } - - QGuard<QmlGraphicsVisualModel> model; - QVariant modelVariant; - QList<FxGridItem*> visibleItems; - QHash<QmlGraphicsItem*,int> unrequestedItems; - FxGridItem *currentItem; - QmlGraphicsGridView::Flow flow; - int visiblePos; - int visibleIndex; - int currentIndex; - int cellWidth; - int cellHeight; - int columns; - int requestedIndex; - QmlComponent *highlightComponent; - FxGridItem *highlight; - FxGridItem *trackedItem; - enum MovementReason { Other, SetIndex, Mouse }; - MovementReason moveReason; - int buffer; - QmlEaseFollow *highlightXAnimator; - QmlEaseFollow *highlightYAnimator; - enum BufferMode { NoBuffer = 0x00, BufferBefore = 0x01, BufferAfter = 0x02 }; - BufferMode bufferMode; - - bool ownModel : 1; - bool wrap : 1; - bool autoHighlight : 1; - bool fixCurrentVisibility : 1; - bool lazyRelease : 1; - bool layoutScheduled : 1; - bool deferredRelease : 1; -}; - -void QmlGraphicsGridViewPrivate::init() -{ - Q_Q(QmlGraphicsGridView); - q->setFlag(QGraphicsItem::ItemIsFocusScope); - QObject::connect(q, SIGNAL(widthChanged()), q, SLOT(sizeChange())); - QObject::connect(q, SIGNAL(heightChanged()), q, SLOT(sizeChange())); - q->setFlickDirection(QmlGraphicsFlickable::VerticalFlick); -} - -void QmlGraphicsGridViewPrivate::clear() -{ - for (int i = 0; i < visibleItems.count(); ++i) - releaseItem(visibleItems.at(i)); - visibleItems.clear(); - visiblePos = 0; - visibleIndex = 0; - releaseItem(currentItem); - currentItem = 0; - createHighlight(); - trackedItem = 0; -} - -FxGridItem *QmlGraphicsGridViewPrivate::createItem(int modelIndex) -{ - Q_Q(QmlGraphicsGridView); - // create object - requestedIndex = modelIndex; - FxGridItem *listItem = 0; - if (QmlGraphicsItem *item = model->item(modelIndex, false)) { - listItem = new FxGridItem(item, q); - listItem->index = modelIndex; - // complete - model->completeItem(); - listItem->item->setZValue(1); - listItem->item->setParent(q->viewport()); - unrequestedItems.remove(listItem->item); - } - requestedIndex = 0; - return listItem; -} - - -void QmlGraphicsGridViewPrivate::releaseItem(FxGridItem *item) -{ - Q_Q(QmlGraphicsGridView); - if (!item || !model) - return; - if (trackedItem == item) { - QObject::disconnect(trackedItem->item, SIGNAL(yChanged()), q, SLOT(trackedPositionChanged())); - QObject::disconnect(trackedItem->item, SIGNAL(xChanged()), q, SLOT(trackedPositionChanged())); - trackedItem = 0; - } - if (model->release(item->item) == 0) { - // item was not destroyed, and we no longer reference it. - unrequestedItems.insert(item->item, model->indexOf(item->item, q)); - } - delete item; -} - -void QmlGraphicsGridViewPrivate::refill(qreal from, qreal to, bool doBuffer) -{ - Q_Q(QmlGraphicsGridView); - if (!isValid() || !q->isComponentComplete()) - return; - - qreal bufferFrom = from - buffer; - qreal bufferTo = to + buffer; - qreal fillFrom = from; - qreal fillTo = to; - if (doBuffer && (bufferMode & BufferAfter)) - fillTo = bufferTo; - if (doBuffer && (bufferMode & BufferBefore)) - fillFrom = bufferFrom; - - bool changed = false; - - int colPos = colPosAt(visibleIndex); - int rowPos = rowPosAt(visibleIndex); - int modelIndex = visibleIndex; - if (visibleItems.count()) { - rowPos = visibleItems.last()->rowPos(); - colPos = visibleItems.last()->colPos() + colSize(); - if (colPos > colSize() * (columns-1)) { - colPos = 0; - rowPos += rowSize(); - } - int i = visibleItems.count() - 1; - while (i > 0 && visibleItems.at(i)->index == -1) - --i; - modelIndex = visibleItems.at(i)->index + 1; - } - int colNum = colPos / colSize(); - - FxGridItem *item = 0; - - // Item creation and release is staggered in order to avoid - // creating/releasing multiple items in one frame - // while flicking (as much as possible). - while (modelIndex < model->count() && rowPos <= fillTo + rowSize()*(columns - colNum)/(columns+1)) { -// qDebug() << "refill: append item" << modelIndex; - if (!(item = createItem(modelIndex))) - break; - item->setPosition(colPos, rowPos); - visibleItems.append(item); - colPos += colSize(); - colNum++; - if (colPos > colSize() * (columns-1)) { - colPos = 0; - colNum = 0; - rowPos += rowSize(); - } - ++modelIndex; - changed = true; - if (doBuffer) // never buffer more than one item per frame - break; - } - - if (visibleItems.count()) { - rowPos = visibleItems.first()->rowPos(); - colPos = visibleItems.first()->colPos() - colSize(); - if (colPos < 0) { - colPos = colSize() * (columns - 1); - rowPos -= rowSize(); - } - } - colNum = colPos / colSize(); - while (visibleIndex > 0 && rowPos + rowSize() - 1 >= fillFrom - rowSize()*(colNum+1)/(columns+1)){ -// qDebug() << "refill: prepend item" << visibleIndex-1 << "top pos" << rowPos << colPos; - if (!(item = createItem(visibleIndex-1))) - break; - --visibleIndex; - item->setPosition(colPos, rowPos); - visibleItems.prepend(item); - colPos -= colSize(); - colNum--; - if (colPos < 0) { - colPos = colSize() * (columns - 1); - colNum = columns-1; - rowPos -= rowSize(); - } - changed = true; - if (doBuffer) // never buffer more than one item per frame - break; - } - - if (!lazyRelease || !changed || deferredRelease) { // avoid destroying items in the same frame that we create - while (visibleItems.count() > 1 - && (item = visibleItems.first()) - && item->endRowPos() < bufferFrom - rowSize()*(item->colPos()/colSize()+1)/(columns+1)) { - if (item->attached->delayRemove()) - break; -// qDebug() << "refill: remove first" << visibleIndex << "top end pos" << item->endRowPos(); - if (item->index != -1) - visibleIndex++; - visibleItems.removeFirst(); - releaseItem(item); - changed = true; - } - while (visibleItems.count() > 1 - && (item = visibleItems.last()) - && item->rowPos() > bufferTo + rowSize()*(columns - item->colPos()/colSize())/(columns+1)) { - if (item->attached->delayRemove()) - break; -// qDebug() << "refill: remove last" << visibleIndex+visibleItems.count()-1; - visibleItems.removeLast(); - releaseItem(item); - changed = true; - } - deferredRelease = false; - } else { - deferredRelease = true; - } - if (changed) { - if (flow == QmlGraphicsGridView::LeftToRight) - q->setViewportHeight(endPosition() - startPosition()); - else - q->setViewportWidth(endPosition() - startPosition()); - } else if (!doBuffer && buffer && bufferMode != NoBuffer) { - refill(from, to, true); - } - lazyRelease = false; -} - -void QmlGraphicsGridViewPrivate::updateGrid() -{ - Q_Q(QmlGraphicsGridView); - columns = (int)qMax((flow == QmlGraphicsGridView::LeftToRight ? q->width() : q->height()) / colSize(), qreal(1.)); - if (isValid()) { - if (flow == QmlGraphicsGridView::LeftToRight) - q->setViewportHeight(endPosition() - startPosition()); - else - q->setViewportWidth(endPosition() - startPosition()); - } -} - -void QmlGraphicsGridViewPrivate::scheduleLayout() -{ - Q_Q(QmlGraphicsGridView); - if (!layoutScheduled) { - layoutScheduled = true; - QMetaObject::invokeMethod(q, "layout", Qt::QueuedConnection); - } -} - -void QmlGraphicsGridViewPrivate::layout(bool removed) -{ - Q_Q(QmlGraphicsGridView); - layoutScheduled = false; - if (visibleItems.count()) { - qreal rowPos = visibleItems.first()->rowPos(); - qreal colPos = visibleItems.first()->colPos(); - int col = visibleIndex % columns; - if (colPos != col * colSize()) { - if (removed) - rowPos -= rowSize(); - colPos = col * colSize(); - visibleItems.first()->setPosition(colPos, rowPos); - } - for (int i = 1; i < visibleItems.count(); ++i) { - FxGridItem *item = visibleItems.at(i); - colPos += colSize(); - if (colPos > colSize() * (columns-1)) { - colPos = 0; - rowPos += rowSize(); - } - item->setPosition(colPos, rowPos); - } - } - q->refill(); - updateHighlight(); - moveReason = Other; - if (flow == QmlGraphicsGridView::LeftToRight) { - q->setViewportHeight(endPosition() - startPosition()); - fixupY(); - } else { - q->setViewportWidth(endPosition() - startPosition()); - fixupX(); - } - updateUnrequestedPositions(); -} - -void QmlGraphicsGridViewPrivate::updateUnrequestedIndexes() -{ - Q_Q(QmlGraphicsGridView); - QHash<QmlGraphicsItem*,int>::iterator it; - for (it = unrequestedItems.begin(); it != unrequestedItems.end(); ++it) - *it = model->indexOf(it.key(), q); -} - -void QmlGraphicsGridViewPrivate::updateUnrequestedPositions() -{ - QHash<QmlGraphicsItem*,int>::const_iterator it; - for (it = unrequestedItems.begin(); it != unrequestedItems.end(); ++it) { - if (flow == QmlGraphicsGridView::LeftToRight) { - it.key()->setPos(QPointF(colPosAt(*it), rowPosAt(*it))); - } else { - it.key()->setPos(QPointF(rowPosAt(*it), colPosAt(*it))); - } - } -} - -void QmlGraphicsGridViewPrivate::updateTrackedItem() -{ - Q_Q(QmlGraphicsGridView); - FxGridItem *item = currentItem; - if (highlight) - item = highlight; - - FxGridItem *oldTracked = trackedItem; - - if (trackedItem && item != trackedItem) { - QObject::disconnect(trackedItem->item, SIGNAL(yChanged()), q, SLOT(trackedPositionChanged())); - QObject::disconnect(trackedItem->item, SIGNAL(xChanged()), q, SLOT(trackedPositionChanged())); - trackedItem = 0; - } - - if (!trackedItem && item) { - trackedItem = item; - QObject::connect(trackedItem->item, SIGNAL(yChanged()), q, SLOT(trackedPositionChanged())); - QObject::connect(trackedItem->item, SIGNAL(xChanged()), q, SLOT(trackedPositionChanged())); - } - if (trackedItem && trackedItem != oldTracked) - q->trackedPositionChanged(); -} - -void QmlGraphicsGridViewPrivate::createHighlight() -{ - Q_Q(QmlGraphicsGridView); - bool changed = false; - if (highlight) { - if (trackedItem == highlight) - trackedItem = 0; - delete highlight->item; - delete highlight; - highlight = 0; - delete highlightXAnimator; - delete highlightYAnimator; - highlightXAnimator = 0; - highlightYAnimator = 0; - changed = true; - } - - if (currentItem) { - QmlGraphicsItem *item = 0; - if (highlightComponent) { - QmlContext *highlightContext = new QmlContext(qmlContext(q)); - QObject *nobj = highlightComponent->create(highlightContext); - if (nobj) { - highlightContext->setParent(nobj); - item = qobject_cast<QmlGraphicsItem *>(nobj); - if (!item) - delete nobj; - } else { - delete highlightContext; - } - } else { - item = new QmlGraphicsItem; - item->setParent(q->viewport()); - } - if (item) { - item->setParent(q->viewport()); - highlight = new FxGridItem(item, q); - highlightXAnimator = new QmlEaseFollow(q); - highlightXAnimator->setTarget(QmlMetaProperty(highlight->item, QLatin1String("x"))); - highlightXAnimator->setDuration(150); - highlightXAnimator->setEnabled(autoHighlight); - highlightYAnimator = new QmlEaseFollow(q); - highlightYAnimator->setTarget(QmlMetaProperty(highlight->item, QLatin1String("y"))); - highlightYAnimator->setDuration(150); - highlightYAnimator->setEnabled(autoHighlight); - changed = true; - } - } - if (changed) - emit q->highlightChanged(); -} - -void QmlGraphicsGridViewPrivate::updateHighlight() -{ - if ((!currentItem && highlight) || (currentItem && !highlight)) - createHighlight(); - if (currentItem && autoHighlight && highlight && !moving) { - // auto-update highlight - highlightXAnimator->setSourceValue(currentItem->item->x()); - highlightYAnimator->setSourceValue(currentItem->item->y()); - highlight->item->setWidth(currentItem->item->width()); - highlight->item->setHeight(currentItem->item->height()); - } - updateTrackedItem(); -} - -void QmlGraphicsGridViewPrivate::updateCurrent(int modelIndex) -{ - Q_Q(QmlGraphicsGridView); - if (!q->isComponentComplete() || !isValid() || modelIndex < 0 || modelIndex >= model->count()) { - if (currentItem) { - currentItem->attached->setIsCurrentItem(false); - releaseItem(currentItem); - currentItem = 0; - currentIndex = -1; - updateHighlight(); - emit q->currentIndexChanged(); - } - return; - } - - if (currentItem && currentIndex == modelIndex) { - updateHighlight(); - return; - } - - FxGridItem *oldCurrentItem = currentItem; - currentIndex = modelIndex; - currentItem = createItem(modelIndex); - fixCurrentVisibility = true; - if (oldCurrentItem && (!currentItem || oldCurrentItem->item != currentItem->item)) - oldCurrentItem->attached->setIsCurrentItem(false); - if (currentItem) { - currentItem->setPosition(colPosAt(modelIndex), rowPosAt(modelIndex)); - currentItem->item->setFocus(true); - currentItem->attached->setIsCurrentItem(true); - } - updateHighlight(); - emit q->currentIndexChanged(); - releaseItem(oldCurrentItem); -} - -//---------------------------------------------------------------------------- - -/*! - \qmlclass GridView QmlGraphicsGridView - \inherits Flickable - \brief The GridView item provides a grid view of items provided by a model. - - The model is typically provided by a QAbstractListModel "C++ model object", - but can also be created directly in QML. - - The items are laid out top to bottom (vertically) or left to right (horizontally) - and may be flicked to scroll. - - The below example creates a very simple grid, using a QML model. - - \image gridview.png - - \snippet doc/src/snippets/declarative/gridview/gridview.qml 3 - - The model is defined as a ListModel using QML: - \quotefile doc/src/snippets/declarative/gridview/dummydata/ContactModel.qml - - In this case ListModel is a handy way for us to test our UI. In practice - the model would be implemented in C++, or perhaps via a SQL data source. -*/ -QmlGraphicsGridView::QmlGraphicsGridView(QmlGraphicsItem *parent) - : QmlGraphicsFlickable(*(new QmlGraphicsGridViewPrivate), parent) -{ - Q_D(QmlGraphicsGridView); - d->init(); -} - -QmlGraphicsGridView::~QmlGraphicsGridView() -{ - Q_D(QmlGraphicsGridView); - d->clear(); - if (d->ownModel) - delete d->model; -} - -/*! - \qmlattachedproperty bool GridView::isCurrentItem - This attched property is true if this delegate is the current item; otherwise false. - - It is attached to each instance of the delegate. -*/ - -/*! - \qmlattachedproperty GridView GridView::view - This attached property holds the view that manages this delegate instance. - - It is attached to each instance of the delegate. -*/ - -/*! - \qmlattachedproperty bool GridView::delayRemove - This attached property holds whether the delegate may be destroyed. - - It is attached to each instance of the delegate. - - It is sometimes necessary to delay the destruction of an item - until an animation completes. - - The example below ensures that the animation completes before - the item is removed from the grid. - - \code - Component { - id: myDelegate - Item { - id: wrapper - GridView.onRemove: SequentialAnimation { - PropertyAction { target: wrapper.GridView; property: "delayRemove"; value: true } - NumberAnimation { target: wrapper; property: "scale"; to: 0; duration: 250; easing: "easeInOutQuad" } - PropertyAction { target: wrapper.GridView; property: "delayRemove"; value: false } - } - } - } - \endcode -*/ - -/*! - \qmlattachedsignal GridView::onAdd() - This attached handler is called immediately after an item is added to the view. -*/ - -/*! - \qmlattachedsignal GridView::onRemove() - This attached handler is called immediately before an item is removed from the view. -*/ - - -/*! - \qmlproperty model GridView::model - This property holds the model providing data for the grid. - - The model provides a set of data that is used to create the items - for the view. For large or dynamic datasets the model is usually - provided by a C++ model object. The C++ model object must be a \l - {QAbstractItemModel} subclass, a VisualModel, or a simple list. - - \sa {qmlmodels}{Data Models} -*/ -QVariant QmlGraphicsGridView::model() const -{ - Q_D(const QmlGraphicsGridView); - return d->modelVariant; -} - -void QmlGraphicsGridView::setModel(const QVariant &model) -{ - Q_D(QmlGraphicsGridView); - if (d->model) { - disconnect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int))); - disconnect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int))); - disconnect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int))); - disconnect(d->model, SIGNAL(createdItem(int, QmlGraphicsItem*)), this, SLOT(createdItem(int,QmlGraphicsItem*))); - disconnect(d->model, SIGNAL(destroyingItem(QmlGraphicsItem*)), this, SLOT(destroyingItem(QmlGraphicsItem*))); - } - d->clear(); - d->modelVariant = model; - QObject *object = qvariant_cast<QObject*>(model); - QmlGraphicsVisualModel *vim = 0; - if (object && (vim = qobject_cast<QmlGraphicsVisualModel *>(object))) { - if (d->ownModel) { - delete d->model; - d->ownModel = false; - } - d->model = vim; - } else { - if (!d->ownModel) { - d->model = new QmlGraphicsVisualDataModel(qmlContext(this)); - d->ownModel = true; - } - if (QmlGraphicsVisualDataModel *dataModel = qobject_cast<QmlGraphicsVisualDataModel*>(d->model)) - dataModel->setModel(model); - } - if (d->model) { - if (isComponentComplete()) { - refill(); - if (d->currentIndex >= d->model->count() || d->currentIndex < 0) { - setCurrentIndex(0); - } else { - d->moveReason = QmlGraphicsGridViewPrivate::SetIndex; - d->updateCurrent(d->currentIndex); - } - } - connect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int))); - connect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int))); - connect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int))); - connect(d->model, SIGNAL(createdItem(int, QmlGraphicsItem*)), this, SLOT(createdItem(int,QmlGraphicsItem*))); - connect(d->model, SIGNAL(destroyingItem(QmlGraphicsItem*)), this, SLOT(destroyingItem(QmlGraphicsItem*))); - emit countChanged(); - } -} - -/*! - \qmlproperty component GridView::delegate - - The delegate provides a template defining each item instantiated by the view. - The index is exposed as an accessible \c index property. Properties of the - model are also available depending upon the type of \l {qmlmodels}{Data Model}. - - Note that the GridView will layout the items based on the size of the root item - in the delegate. - - Here is an example delegate: - \snippet doc/src/snippets/declarative/gridview/gridview.qml 0 -*/ -QmlComponent *QmlGraphicsGridView::delegate() const -{ - Q_D(const QmlGraphicsGridView); - if (d->model) { - if (QmlGraphicsVisualDataModel *dataModel = qobject_cast<QmlGraphicsVisualDataModel*>(d->model)) - return dataModel->delegate(); - } - - return 0; -} - -void QmlGraphicsGridView::setDelegate(QmlComponent *delegate) -{ - Q_D(QmlGraphicsGridView); - if (delegate == this->delegate()) - return; - - if (!d->ownModel) { - d->model = new QmlGraphicsVisualDataModel(qmlContext(this)); - d->ownModel = true; - } - if (QmlGraphicsVisualDataModel *dataModel = qobject_cast<QmlGraphicsVisualDataModel*>(d->model)) { - dataModel->setDelegate(delegate); - if (isComponentComplete()) { - refill(); - d->moveReason = QmlGraphicsGridViewPrivate::SetIndex; - d->updateCurrent(d->currentIndex); - } - } -} - -/*! - \qmlproperty int GridView::currentIndex - \qmlproperty Item GridView::currentItem - - \c currentIndex holds the index of the current item. - \c currentItem is the current item. Note that the position of the current item - may only be approximate until it becomes visible in the view. -*/ -int QmlGraphicsGridView::currentIndex() const -{ - Q_D(const QmlGraphicsGridView); - return d->currentIndex; -} - -void QmlGraphicsGridView::setCurrentIndex(int index) -{ - Q_D(QmlGraphicsGridView); - if (isComponentComplete() && d->isValid() && index != d->currentIndex && index < d->model->count() && index >= 0) { - d->moveReason = QmlGraphicsGridViewPrivate::SetIndex; - cancelFlick(); - d->updateCurrent(index); - } else { - d->currentIndex = index; - } -} - -QmlGraphicsItem *QmlGraphicsGridView::currentItem() -{ - Q_D(QmlGraphicsGridView); - if (!d->currentItem) - return 0; - return d->currentItem->item; -} - -/*! - \qmlproperty Item GridView::highlightItem - - \c highlightItem holds the highlight item, which was created - from the \l highlight component. - - The highlightItem is managed by the view unless - \l highlightFollowsCurrentItem is set to false. - - \sa highlight, highlightFollowsCurrentItem -*/ -QmlGraphicsItem *QmlGraphicsGridView::highlightItem() -{ - Q_D(QmlGraphicsGridView); - if (!d->highlight) - return 0; - return d->highlight->item; -} - -/*! - \qmlproperty int GridView::count - This property holds the number of items in the view. -*/ -int QmlGraphicsGridView::count() const -{ - Q_D(const QmlGraphicsGridView); - if (d->model) - return d->model->count(); - return 0; -} - -/*! - \qmlproperty component GridView::highlight - This property holds the component to use as the highlight. - - An instance of the highlight component will be created for each view. - The geometry of the resultant component instance will be managed by the view - so as to stay with the current item, unless the highlightFollowsCurrentItem property is false. - - The below example demonstrates how to make a simple highlight: - \snippet doc/src/snippets/declarative/gridview/gridview.qml 1 - - \sa highlightItem, highlightFollowsCurrentItem -*/ -QmlComponent *QmlGraphicsGridView::highlight() const -{ - Q_D(const QmlGraphicsGridView); - return d->highlightComponent; -} - -void QmlGraphicsGridView::setHighlight(QmlComponent *highlight) -{ - Q_D(QmlGraphicsGridView); - if (highlight != d->highlightComponent) { - d->highlightComponent = highlight; - d->updateCurrent(d->currentIndex); - } -} - -/*! - \qmlproperty bool GridView::highlightFollowsCurrentItem - This property sets whether the highlight is managed by the view. - - If highlightFollowsCurrentItem is true, the highlight will be moved smoothly - to follow the current item. If highlightFollowsCurrentItem is false, the - highlight will not be moved by the view, and must be implemented - by the highlight component, for example: - - \code - Component { - id: myHighlight - Rectangle { - id: wrapper; color: "lightsteelblue"; radius: 4; width: 320; height: 60 > - y: SpringFollow { source: Wrapper.GridView.view.currentItem.y; spring: 3; damping: 0.2 } - x: SpringFollow { source: Wrapper.GridView.view.currentItem.x; spring: 3; damping: 0.2 } - } - } - \endcode -*/ -bool QmlGraphicsGridView::highlightFollowsCurrentItem() const -{ - Q_D(const QmlGraphicsGridView); - return d->autoHighlight; -} - -void QmlGraphicsGridView::setHighlightFollowsCurrentItem(bool autoHighlight) -{ - Q_D(QmlGraphicsGridView); - if (d->autoHighlight != autoHighlight) { - d->autoHighlight = autoHighlight; - if (d->highlightXAnimator) { - d->highlightXAnimator->setEnabled(d->autoHighlight); - d->highlightYAnimator->setEnabled(d->autoHighlight); - } - d->updateHighlight(); - } -} - -/*! - \qmlproperty enumeration GridView::flow - This property holds the flow of the grid. - - Possible values are \c LeftToRight (default) and \c TopToBottom. - - If \a flow is \c LeftToRight, the view will scroll vertically. - If \a flow is \c TopToBottom, the view will scroll horizontally. -*/ -QmlGraphicsGridView::Flow QmlGraphicsGridView::flow() const -{ - Q_D(const QmlGraphicsGridView); - return d->flow; -} - -void QmlGraphicsGridView::setFlow(Flow flow) -{ - Q_D(QmlGraphicsGridView); - if (d->flow != flow) { - d->flow = flow; - if (d->flow == LeftToRight) { - setViewportWidth(-1); - setFlickDirection(QmlGraphicsFlickable::VerticalFlick); - } else { - setViewportHeight(-1); - setFlickDirection(QmlGraphicsFlickable::HorizontalFlick); - } - d->clear(); - d->updateGrid(); - refill(); - d->updateCurrent(d->currentIndex); - } -} - -/*! - \qmlproperty bool GridView::keyNavigationWraps - This property holds whether the grid wraps key navigation - - If this property is true then key presses to move off of one end of the grid will cause the - selection to jump to the other side. -*/ -bool QmlGraphicsGridView::isWrapEnabled() const -{ - Q_D(const QmlGraphicsGridView); - return d->wrap; -} - -void QmlGraphicsGridView::setWrapEnabled(bool wrap) -{ - Q_D(QmlGraphicsGridView); - d->wrap = wrap; -} - -/*! - \qmlproperty int GridView::cacheBuffer - This property holds the number of off-screen pixels to cache. - - This property determines the number of pixels above the top of the view - and below the bottom of the view to cache. Setting this value can make - scrolling the view smoother at the expense of additional memory usage. -*/ -int QmlGraphicsGridView::cacheBuffer() const -{ - Q_D(const QmlGraphicsGridView); - return d->buffer; -} - -void QmlGraphicsGridView::setCacheBuffer(int buffer) -{ - Q_D(QmlGraphicsGridView); - if (d->buffer != buffer) { - d->buffer = buffer; - if (isComponentComplete()) - refill(); - } -} - -/*! - \qmlproperty int GridView::cellWidth - \qmlproperty int GridView::cellHeight - - These properties holds the width and height of each cell in the grid - - The default cell size is 100x100. -*/ -int QmlGraphicsGridView::cellWidth() const -{ - Q_D(const QmlGraphicsGridView); - return d->cellWidth; -} - -void QmlGraphicsGridView::setCellWidth(int cellWidth) -{ - Q_D(QmlGraphicsGridView); - if (cellWidth != d->cellWidth && cellWidth > 0) { - d->cellWidth = qMax(1, cellWidth); - d->updateGrid(); - emit cellWidthChanged(); - d->layout(); - } -} - -int QmlGraphicsGridView::cellHeight() const -{ - Q_D(const QmlGraphicsGridView); - return d->cellHeight; -} - -void QmlGraphicsGridView::setCellHeight(int cellHeight) -{ - Q_D(QmlGraphicsGridView); - if (cellHeight != d->cellHeight && cellHeight > 0) { - d->cellHeight = qMax(1, cellHeight); - d->updateGrid(); - emit cellHeightChanged(); - d->layout(); - } -} - -void QmlGraphicsGridView::sizeChange() -{ - Q_D(QmlGraphicsGridView); - if (isComponentComplete()) { - d->updateGrid(); - d->layout(); - } -} - -void QmlGraphicsGridView::viewportMoved() -{ - Q_D(QmlGraphicsGridView); - QmlGraphicsFlickable::viewportMoved(); - d->lazyRelease = true; - if (d->flicked) { - if (yflick()) { - if (d->velocityY > 0) - d->bufferMode = QmlGraphicsGridViewPrivate::BufferBefore; - else if (d->velocityY < 0) - d->bufferMode = QmlGraphicsGridViewPrivate::BufferAfter; - } - - if (xflick()) { - if (d->velocityX > 0) - d->bufferMode = QmlGraphicsGridViewPrivate::BufferBefore; - else if (d->velocityX < 0) - d->bufferMode = QmlGraphicsGridViewPrivate::BufferAfter; - } - } - refill(); -} - -qreal QmlGraphicsGridView::minYExtent() const -{ - Q_D(const QmlGraphicsGridView); - if (d->flow == QmlGraphicsGridView::TopToBottom) - return QmlGraphicsFlickable::minYExtent(); - return -d->startPosition(); -} - -qreal QmlGraphicsGridView::maxYExtent() const -{ - Q_D(const QmlGraphicsGridView); - if (d->flow == QmlGraphicsGridView::TopToBottom) - return QmlGraphicsFlickable::maxYExtent(); - qreal extent = -(d->endPosition() - height()); - const qreal minY = minYExtent(); - if (extent > minY) - extent = minY; - return extent; -} - -qreal QmlGraphicsGridView::minXExtent() const -{ - Q_D(const QmlGraphicsGridView); - if (d->flow == QmlGraphicsGridView::LeftToRight) - return QmlGraphicsFlickable::minXExtent(); - return -d->startPosition(); -} - -qreal QmlGraphicsGridView::maxXExtent() const -{ - Q_D(const QmlGraphicsGridView); - if (d->flow == QmlGraphicsGridView::LeftToRight) - return QmlGraphicsFlickable::maxXExtent(); - qreal extent = -(d->endPosition() - width()); - const qreal minX = minXExtent(); - if (extent > minX) - extent = minX; - return extent; -} - -void QmlGraphicsGridView::keyPressEvent(QKeyEvent *event) -{ - Q_D(QmlGraphicsGridView); - QmlGraphicsFlickable::keyPressEvent(event); - if (event->isAccepted()) - return; - if (d->model && d->model->count() && d->interactive) { - d->moveReason = QmlGraphicsGridViewPrivate::SetIndex; - int oldCurrent = currentIndex(); - switch (event->key()) { - case Qt::Key_Up: - moveCurrentIndexUp(); - break; - case Qt::Key_Down: - moveCurrentIndexDown(); - break; - case Qt::Key_Left: - moveCurrentIndexLeft(); - break; - case Qt::Key_Right: - moveCurrentIndexRight(); - break; - default: - break; - } - if (oldCurrent != currentIndex()) { - event->accept(); - return; - } - } - d->moveReason = QmlGraphicsGridViewPrivate::Other; - event->ignore(); -} - -/*! - \qmlmethod GridView::moveCurrentIndexUp() - - Move the currentIndex up one item in the view. - The current index will wrap if keyNavigationWraps is true and it - is currently at the end. -*/ -void QmlGraphicsGridView::moveCurrentIndexUp() -{ - Q_D(QmlGraphicsGridView); - if (d->flow == QmlGraphicsGridView::LeftToRight) { - if (currentIndex() >= d->columns || d->wrap) { - int index = currentIndex() - d->columns; - setCurrentIndex(index >= 0 ? index : d->model->count()-1); - } - } else { - if (currentIndex() > 0 || d->wrap) { - int index = currentIndex() - 1; - setCurrentIndex(index >= 0 ? index : d->model->count()-1); - } - } -} - -/*! - \qmlmethod GridView::moveCurrentIndexDown() - - Move the currentIndex down one item in the view. - The current index will wrap if keyNavigationWraps is true and it - is currently at the end. -*/ -void QmlGraphicsGridView::moveCurrentIndexDown() -{ - Q_D(QmlGraphicsGridView); - if (d->flow == QmlGraphicsGridView::LeftToRight) { - if (currentIndex() < d->model->count() - d->columns || d->wrap) { - int index = currentIndex()+d->columns; - setCurrentIndex(index < d->model->count() ? index : 0); - } - } else { - if (currentIndex() < d->model->count() - 1 || d->wrap) { - int index = currentIndex() + 1; - setCurrentIndex(index < d->model->count() ? index : 0); - } - } -} - -/*! - \qmlmethod GridView::moveCurrentIndexLeft() - - Move the currentIndex left one item in the view. - The current index will wrap if keyNavigationWraps is true and it - is currently at the end. -*/ -void QmlGraphicsGridView::moveCurrentIndexLeft() -{ - Q_D(QmlGraphicsGridView); - if (d->flow == QmlGraphicsGridView::LeftToRight) { - if (currentIndex() > 0 || d->wrap) { - int index = currentIndex() - 1; - setCurrentIndex(index >= 0 ? index : d->model->count()-1); - } - } else { - if (currentIndex() >= d->columns || d->wrap) { - int index = currentIndex() - d->columns; - setCurrentIndex(index >= 0 ? index : d->model->count()-1); - } - } -} - -/*! - \qmlmethod GridView::moveCurrentIndexRight() - - Move the currentIndex right one item in the view. - The current index will wrap if keyNavigationWraps is true and it - is currently at the end. -*/ -void QmlGraphicsGridView::moveCurrentIndexRight() -{ - Q_D(QmlGraphicsGridView); - if (d->flow == QmlGraphicsGridView::LeftToRight) { - if (currentIndex() < d->model->count() - 1 || d->wrap) { - int index = currentIndex() + 1; - setCurrentIndex(index < d->model->count() ? index : 0); - } - } else { - if (currentIndex() < d->model->count() - d->columns || d->wrap) { - int index = currentIndex()+d->columns; - setCurrentIndex(index < d->model->count() ? index : 0); - } - } -} - -void QmlGraphicsGridView::positionViewAtIndex(int index) -{ - Q_D(QmlGraphicsGridView); - if (!d->isValid() || index < 0 || index >= d->model->count()) - return; - - qreal maxExtent = d->flow == QmlGraphicsGridView::LeftToRight ? -maxYExtent() : -maxXExtent(); - FxGridItem *item = d->visibleItem(index); - if (item) { - // Already created - just move to top of view - int pos = qMin(item->rowPos(), maxExtent); - d->setPosition(pos); - } else { - int pos = d->rowPosAt(index); - // save the currently visible items in case any of them end up visible again - QList<FxGridItem*> oldVisible = d->visibleItems; - d->visibleItems.clear(); - d->visibleIndex = index - index % d->columns; - d->setPosition(pos); - // setPosition() will cause refill. Adjust if we have moved beyond range - if (d->position() > maxExtent) - d->setPosition(maxExtent); - // now release the reference to all the old visible items. - for (int i = 0; i < oldVisible.count(); ++i) - d->releaseItem(oldVisible.at(i)); - } -} - - -void QmlGraphicsGridView::componentComplete() -{ - Q_D(QmlGraphicsGridView); - QmlGraphicsFlickable::componentComplete(); - d->updateGrid(); - refill(); - if (d->currentIndex < 0) - d->updateCurrent(0); - else - d->updateCurrent(d->currentIndex); -} - -void QmlGraphicsGridView::trackedPositionChanged() -{ - Q_D(QmlGraphicsGridView); - if (!d->trackedItem || !d->currentItem) - return; - if (!isFlicking() && !d->moving && d->moveReason == QmlGraphicsGridViewPrivate::SetIndex) { - const qreal viewPos = d->position(); - if (d->trackedItem->rowPos() < viewPos && d->currentItem->rowPos() < viewPos) { - d->setPosition(d->currentItem->rowPos() < d->trackedItem->rowPos() ? d->trackedItem->rowPos() : d->currentItem->rowPos()); - } else if (d->trackedItem->endRowPos() > viewPos + d->size() - && d->currentItem->endRowPos() > viewPos + d->size()) { - qreal pos; - if (d->trackedItem->endRowPos() < d->currentItem->endRowPos()) { - pos = d->trackedItem->endRowPos() - d->size(); - if (d->rowSize() > d->size()) - pos = d->trackedItem->rowPos(); - } else { - pos = d->currentItem->endRowPos() - d->size(); - if (d->rowSize() > d->size()) - pos = d->currentItem->rowPos(); - } - d->setPosition(pos); - } - } -} - -void QmlGraphicsGridView::itemsInserted(int modelIndex, int count) -{ - Q_D(QmlGraphicsGridView); - if (!d->visibleItems.count() || d->model->count() <= 1) { - refill(); - d->updateCurrent(qMax(0, qMin(d->currentIndex, d->model->count()-1))); - emit countChanged(); - return; - } - - int index = d->mapFromModel(modelIndex); - if (index == -1) { - int i = d->visibleItems.count() - 1; - while (i > 0 && d->visibleItems.at(i)->index == -1) - --i; - if (d->visibleItems.at(i)->index + 1 == modelIndex) { - // Special case of appending an item to the model. - index = d->visibleIndex + d->visibleItems.count(); - } else { - if (modelIndex <= d->visibleIndex) { - // Insert before visible items - d->visibleIndex += count; - for (int i = 0; i < d->visibleItems.count(); ++i) { - FxGridItem *listItem = d->visibleItems.at(i); - if (listItem->index != -1 && listItem->index >= modelIndex) - listItem->index += count; - } - } - if (d->currentIndex >= modelIndex) { - // adjust current item index - d->currentIndex += count; - if (d->currentItem) - d->currentItem->index = d->currentIndex; - } - d->layout(); - emit countChanged(); - return; - } - } - - // At least some of the added items will be visible - int insertCount = count; - if (index < d->visibleIndex) { - insertCount -= d->visibleIndex - index; - index = d->visibleIndex; - modelIndex = d->visibleIndex; - } - - index -= d->visibleIndex; - int to = d->buffer+d->position()+d->size()-1; - int colPos, rowPos; - if (index < d->visibleItems.count()) { - colPos = d->visibleItems.at(index)->colPos(); - rowPos = d->visibleItems.at(index)->rowPos(); - } else { - // appending items to visible list - colPos = d->visibleItems.at(index-1)->colPos() + d->colSize(); - rowPos = d->visibleItems.at(index-1)->rowPos(); - if (colPos > d->colSize() * (d->columns-1)) { - colPos = 0; - rowPos += d->rowSize(); - } - } - - QList<FxGridItem*> added; - int i = 0; - while (i < insertCount && rowPos <= to + d->rowSize()*(d->columns - (colPos/d->colSize()))/qreal(d->columns)) { - FxGridItem *item = d->createItem(modelIndex + i); - d->visibleItems.insert(index, item); - item->setPosition(colPos, rowPos); - added.append(item); - colPos += d->colSize(); - if (colPos > d->colSize() * (d->columns-1)) { - colPos = 0; - rowPos += d->rowSize(); - } - ++index; - ++i; - } - if (i < insertCount) { - // We didn't insert all our new items, which means anything - // beyond the current index is not visible - remove it. - while (d->visibleItems.count() > index) { - d->releaseItem(d->visibleItems.takeLast()); - } - } - - if (d->currentIndex >= modelIndex) { - // adjust current item index - d->currentIndex += count; - if (d->currentItem) { - d->currentItem->index = d->currentIndex; - d->currentItem->setPosition(d->colPosAt(d->currentIndex), d->rowPosAt(d->currentIndex)); - } - } - // Update the indexes of the following visible items. - for (; index < d->visibleItems.count(); ++index) { - FxGridItem *listItem = d->visibleItems.at(index); - if (listItem->index != -1) - listItem->index += count; - } - - // everything is in order now - emit add() signal - for (int j = 0; j < added.count(); ++j) - added.at(j)->attached->emitAdd(); - d->layout(); - emit countChanged(); -} - -void QmlGraphicsGridView::itemsRemoved(int modelIndex, int count) -{ - Q_D(QmlGraphicsGridView); - bool currentRemoved = d->currentIndex >= modelIndex && d->currentIndex < modelIndex + count; - bool removedVisible = false; - - // Remove the items from the visible list, skipping anything already marked for removal - QList<FxGridItem*>::Iterator it = d->visibleItems.begin(); - while (it != d->visibleItems.end()) { - FxGridItem *item = *it; - if (item->index == -1 || item->index < modelIndex) { - // already removed, or before removed items - if (item->index < modelIndex) - removedVisible = true; - ++it; - } else if (item->index >= modelIndex + count) { - // after removed items - item->index -= count; - ++it; - } else { - // removed item - removedVisible = true; - item->attached->emitRemove(); - if (item->attached->delayRemove()) { - item->index = -1; - connect(item->attached, SIGNAL(delayRemoveChanged()), this, SLOT(destroyRemoved()), Qt::QueuedConnection); - ++it; - } else { - it = d->visibleItems.erase(it); - d->releaseItem(item); - } - } - } - - // fix current - if (d->currentIndex >= modelIndex + count) { - d->currentIndex -= count; - if (d->currentItem) - d->currentItem->index -= count; - } else if (currentRemoved) { - // current item has been removed. - d->releaseItem(d->currentItem); - d->currentItem = 0; - d->currentIndex = -1; - d->updateCurrent(qMin(modelIndex, d->model->count()-1)); - } - - // update visibleIndex - for (it = d->visibleItems.begin(); it != d->visibleItems.end(); ++it) { - if ((*it)->index != -1) { - d->visibleIndex = (*it)->index; - break; - } - } - - if (removedVisible) { - if (d->visibleItems.isEmpty()) { - d->visibleIndex = 0; - d->setPosition(0); - refill(); - } else { - // Correct the positioning of the items - d->scheduleLayout(); - } - } - - emit countChanged(); -} - -void QmlGraphicsGridView::layout() -{ - Q_D(QmlGraphicsGridView); - if (d->layoutScheduled) - d->layout(); -} - -void QmlGraphicsGridView::destroyRemoved() -{ - Q_D(QmlGraphicsGridView); - for (QList<FxGridItem*>::Iterator it = d->visibleItems.begin(); - it != d->visibleItems.end();) { - FxGridItem *listItem = *it; - if (listItem->index == -1 && listItem->attached->delayRemove() == false) { - d->releaseItem(listItem); - it = d->visibleItems.erase(it); - } else { - ++it; - } - } - - // Correct the positioning of the items - d->layout(); -} - -void QmlGraphicsGridView::itemsMoved(int from, int to, int count) -{ - Q_D(QmlGraphicsGridView); - QHash<int,FxGridItem*> moved; - - bool removedBeforeVisible = false; - FxGridItem *firstItem = d->firstVisibleItem(); - - if (from < to && from < d->visibleIndex && to > d->visibleIndex) - removedBeforeVisible = true; - - QList<FxGridItem*>::Iterator it = d->visibleItems.begin(); - while (it != d->visibleItems.end()) { - FxGridItem *item = *it; - if (item->index >= from && item->index < from + count) { - // take the items that are moving - item->index += (to-from); - moved.insert(item->index, item); - it = d->visibleItems.erase(it); - if (item->rowPos() < firstItem->rowPos()) - removedBeforeVisible = true; - } else { - if (item->index > from && item->index != -1) { - // move everything after the moved items. - item->index -= count; - if (item->index < d->visibleIndex) - d->visibleIndex = item->index; - } else if (item->index != -1) { - removedBeforeVisible = true; - } - ++it; - } - } - - int remaining = count; - int endIndex = d->visibleIndex; - it = d->visibleItems.begin(); - while (it != d->visibleItems.end()) { - FxGridItem *item = *it; - if (remaining && item->index >= to && item->index < to + count) { - // place items in the target position, reusing any existing items - FxGridItem *movedItem = moved.take(item->index); - if (!movedItem) - movedItem = d->createItem(item->index); - it = d->visibleItems.insert(it, movedItem); - ++it; - --remaining; - } else { - if (item->index != -1) { - if (item->index >= to) { - // update everything after the moved items. - item->index += count; - } - endIndex = item->index; - } - ++it; - } - } - - // If we have moved items to the end of the visible items - // then add any existing moved items that we have - while (FxGridItem *item = moved.take(endIndex+1)) { - d->visibleItems.append(item); - ++endIndex; - } - - // update visibleIndex - for (it = d->visibleItems.begin(); it != d->visibleItems.end(); ++it) { - if ((*it)->index != -1) { - d->visibleIndex = (*it)->index; - break; - } - } - - // Fix current index - if (d->currentIndex >= 0 && d->currentItem) { - int oldCurrent = d->currentIndex; - d->currentIndex = d->model->indexOf(d->currentItem->item, this); - if (oldCurrent != d->currentIndex) { - d->currentItem->index = d->currentIndex; - emit currentIndexChanged(); - } - } - - // Whatever moved items remain are no longer visible items. - while (moved.count()) { - int idx = moved.begin().key(); - FxGridItem *item = moved.take(idx); - if (item->item == d->currentItem->item) - item->setPosition(d->colPosAt(idx), d->rowPosAt(idx)); - d->releaseItem(item); - } - - d->layout(removedBeforeVisible); -} - -void QmlGraphicsGridView::createdItem(int index, QmlGraphicsItem *item) -{ - Q_D(QmlGraphicsGridView); - item->setParentItem(this); - if (d->requestedIndex != index) { - item->setParentItem(this); - d->unrequestedItems.insert(item, index); - if (d->flow == QmlGraphicsGridView::LeftToRight) { - item->setPos(QPointF(d->colPosAt(index), d->rowPosAt(index))); - } else { - item->setPos(QPointF(d->rowPosAt(index), d->colPosAt(index))); - } - } -} - -void QmlGraphicsGridView::destroyingItem(QmlGraphicsItem *item) -{ - Q_D(QmlGraphicsGridView); - d->unrequestedItems.remove(item); -} - - -void QmlGraphicsGridView::refill() -{ - Q_D(QmlGraphicsGridView); - d->refill(d->position(), d->position()+d->size()-1); -} - - -QmlGraphicsGridViewAttached *QmlGraphicsGridView::qmlAttachedProperties(QObject *obj) -{ - return QmlGraphicsGridViewAttached::properties(obj); -} - -QT_END_NAMESPACE |