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Diffstat (limited to 'src/declarative/items/qquickgridview.cpp')
| -rw-r--r-- | src/declarative/items/qquickgridview.cpp | 1958 |
1 files changed, 0 insertions, 1958 deletions
diff --git a/src/declarative/items/qquickgridview.cpp b/src/declarative/items/qquickgridview.cpp deleted file mode 100644 index 44e1f14c6f..0000000000 --- a/src/declarative/items/qquickgridview.cpp +++ /dev/null @@ -1,1958 +0,0 @@ -/**************************************************************************** -** -** 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. -** -** $QT_BEGIN_LICENSE:LGPL$ -** GNU Lesser General Public License Usage -** 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. -** -** 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. -** -** Other Usage -** Alternatively, this file may be used in accordance with the terms and -** conditions contained in a signed written agreement between you and Nokia. -** -** -** -** -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "qquickgridview_p.h" -#include "qquickvisualitemmodel_p.h" -#include "qquickflickable_p_p.h" -#include "qquickitemview_p_p.h" - -#include <private/qdeclarativesmoothedanimation_p_p.h> -#include <private/qlistmodelinterface_p.h> - -#include <QtGui/qevent.h> -#include <QtCore/qmath.h> -#include <QtCore/qcoreapplication.h> -#include <math.h> -#include "qplatformdefs.h" - -QT_BEGIN_NAMESPACE - -#ifndef QML_FLICK_SNAPONETHRESHOLD -#define QML_FLICK_SNAPONETHRESHOLD 30 -#endif - -//---------------------------------------------------------------------------- - -class FxGridItemSG : public FxViewItem -{ -public: - FxGridItemSG(QQuickItem *i, QQuickGridView *v, bool own) : FxViewItem(i, own), view(v) { - attached = static_cast<QQuickGridViewAttached*>(qmlAttachedPropertiesObject<QQuickGridView>(item)); - if (attached) - static_cast<QQuickGridViewAttached*>(attached)->setView(view); - } - - ~FxGridItemSG() {} - - qreal position() const { - return rowPos(); - } - - qreal endPosition() const { - return endRowPos(); - } - - qreal size() const { - return view->flow() == QQuickGridView::LeftToRight ? view->cellHeight() : view->cellWidth(); - } - - qreal sectionSize() const { - return 0.0; - } - - qreal rowPos() const { - if (view->flow() == QQuickGridView::LeftToRight) - return item->y(); - else - return (view->effectiveLayoutDirection() == Qt::RightToLeft ? -view->cellWidth()-item->x() : item->x()); - } - - qreal colPos() const { - if (view->flow() == QQuickGridView::LeftToRight) { - if (view->effectiveLayoutDirection() == Qt::RightToLeft) { - qreal colSize = view->cellWidth(); - int columns = view->width()/colSize; - return colSize * (columns-1) - item->x(); - } else { - return item->x(); - } - } else { - return item->y(); - } - } - qreal endRowPos() const { - if (view->flow() == QQuickGridView::LeftToRight) { - return item->y() + view->cellHeight(); - } else { - if (view->effectiveLayoutDirection() == Qt::RightToLeft) - return -item->x(); - else - return item->x() + view->cellWidth(); - } - } - void setPosition(qreal col, qreal row) { - if (view->effectiveLayoutDirection() == Qt::RightToLeft) { - if (view->flow() == QQuickGridView::LeftToRight) { - int columns = view->width()/view->cellWidth(); - item->setPos(QPointF((view->cellWidth() * (columns-1) - col), row)); - } else { - item->setPos(QPointF(-view->cellWidth()-row, col)); - } - } else { - if (view->flow() == QQuickGridView::LeftToRight) - item->setPos(QPointF(col, row)); - else - item->setPos(QPointF(row, col)); - } - } - bool contains(qreal x, qreal y) const { - return (x >= item->x() && x < item->x() + view->cellWidth() && - y >= item->y() && y < item->y() + view->cellHeight()); - } - - QQuickGridView *view; -}; - -//---------------------------------------------------------------------------- - -class QQuickGridViewPrivate : public QQuickItemViewPrivate -{ - Q_DECLARE_PUBLIC(QQuickGridView) - -public: - virtual Qt::Orientation layoutOrientation() const; - virtual bool isContentFlowReversed() const; - bool isRightToLeftTopToBottom() const; - - virtual qreal positionAt(int index) const; - virtual qreal endPositionAt(int index) const; - virtual qreal originPosition() const; - virtual qreal lastPosition() const; - - qreal rowSize() const; - qreal colSize() const; - qreal colPosAt(int modelIndex) const; - qreal rowPosAt(int modelIndex) const; - qreal snapPosAt(qreal pos) const; - FxViewItem *snapItemAt(qreal pos) const; - int snapIndex() const; - - virtual bool addVisibleItems(qreal fillFrom, qreal fillTo, bool doBuffer); - virtual bool removeNonVisibleItems(qreal bufferFrom, qreal bufferTo); - virtual void visibleItemsChanged(); - - virtual FxViewItem *newViewItem(int index, QQuickItem *item); - virtual void repositionPackageItemAt(QQuickItem *item, int index); - virtual void resetItemPosition(FxViewItem *item, FxViewItem *toItem); - virtual void resetFirstItemPosition(); - virtual void moveItemBy(FxViewItem *item, qreal forwards, qreal backwards); - - virtual void createHighlight(); - virtual void updateHighlight(); - virtual void resetHighlightPosition(); - - virtual void setPosition(qreal pos); - virtual void layoutVisibleItems(); - bool applyInsertionChange(const QDeclarativeChangeSet::Insert &, FxViewItem *, InsertionsResult *); - virtual bool needsRefillForAddedOrRemovedIndex(int index) const; - - virtual qreal headerSize() const; - virtual qreal footerSize() const; - virtual bool showHeaderForIndex(int index) const; - virtual bool showFooterForIndex(int index) const; - virtual void updateHeader(); - virtual void updateFooter(); - - virtual void changedVisibleIndex(int newIndex); - virtual void initializeCurrentItem(); - - virtual void updateViewport(); - virtual void itemGeometryChanged(QQuickItem *item, const QRectF &newGeometry, const QRectF &oldGeometry); - virtual void fixupPosition(); - virtual void fixup(AxisData &data, qreal minExtent, qreal maxExtent); - virtual void flick(QQuickItemViewPrivate::AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize, - QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity); - - QQuickGridView::Flow flow; - qreal cellWidth; - qreal cellHeight; - int columns; - QQuickGridView::SnapMode snapMode; - - QSmoothedAnimation *highlightXAnimator; - QSmoothedAnimation *highlightYAnimator; - - QQuickGridViewPrivate() - : flow(QQuickGridView::LeftToRight) - , cellWidth(100), cellHeight(100), columns(1) - , snapMode(QQuickGridView::NoSnap) - , highlightXAnimator(0), highlightYAnimator(0) - {} -}; - -Qt::Orientation QQuickGridViewPrivate::layoutOrientation() const -{ - return flow == QQuickGridView::LeftToRight ? Qt::Vertical : Qt::Horizontal; -} - -bool QQuickGridViewPrivate::isContentFlowReversed() const -{ - return isRightToLeftTopToBottom(); -} - -bool QQuickGridViewPrivate::isRightToLeftTopToBottom() const -{ - Q_Q(const QQuickGridView); - return flow == QQuickGridView::TopToBottom && q->effectiveLayoutDirection() == Qt::RightToLeft; -} - -void QQuickGridViewPrivate::changedVisibleIndex(int newIndex) -{ - visibleIndex = newIndex / columns * columns; -} - -void QQuickGridViewPrivate::setPosition(qreal pos) -{ - Q_Q(QQuickGridView); - if (flow == QQuickGridView::LeftToRight) { - q->QQuickFlickable::setContentY(pos); - q->QQuickFlickable::setContentX(0); - } else { - if (q->effectiveLayoutDirection() == Qt::LeftToRight) - q->QQuickFlickable::setContentX(pos); - else - q->QQuickFlickable::setContentX(-pos-size()); - q->QQuickFlickable::setContentY(0); - } -} - -qreal QQuickGridViewPrivate::originPosition() const -{ - qreal pos = 0; - if (!visibleItems.isEmpty()) - pos = static_cast<FxGridItemSG*>(visibleItems.first())->rowPos() - visibleIndex / columns * rowSize(); - return pos; -} - -qreal QQuickGridViewPrivate::lastPosition() const -{ - qreal pos = 0; - if (model && model->count()) { - // get end position of last item - pos = (rowPosAt(model->count() - 1) + rowSize()); - } - return pos; -} - -qreal QQuickGridViewPrivate::positionAt(int index) const -{ - return rowPosAt(index); -} - -qreal QQuickGridViewPrivate::endPositionAt(int index) const -{ - return rowPosAt(index) + rowSize(); -} - -qreal QQuickGridViewPrivate::rowSize() const { - return flow == QQuickGridView::LeftToRight ? cellHeight : cellWidth; -} -qreal QQuickGridViewPrivate::colSize() const { - return flow == QQuickGridView::LeftToRight ? cellWidth : cellHeight; -} - -qreal QQuickGridViewPrivate::colPosAt(int modelIndex) const -{ - if (FxViewItem *item = visibleItem(modelIndex)) - return static_cast<FxGridItemSG*>(item)->colPos(); - if (!visibleItems.isEmpty()) { - if (modelIndex == visibleIndex) { - FxGridItemSG *firstItem = static_cast<FxGridItemSG*>(visibleItems.first()); - return firstItem->colPos(); - } else if (modelIndex < visibleIndex) { - int count = (visibleIndex - modelIndex) % columns; - int col = static_cast<FxGridItemSG*>(visibleItems.first())->colPos() / colSize(); - col = (columns - count + col) % columns; - return col * colSize(); - } else { - int count = columns - 1 - (modelIndex - visibleItems.last()->index - 1) % columns; - return static_cast<FxGridItemSG*>(visibleItems.last())->colPos() - count * colSize(); - } - } - return (modelIndex % columns) * colSize(); -} - -qreal QQuickGridViewPrivate::rowPosAt(int modelIndex) const -{ - if (FxViewItem *item = visibleItem(modelIndex)) - return static_cast<FxGridItemSG*>(item)->rowPos(); - if (!visibleItems.isEmpty()) { - if (modelIndex == visibleIndex) { - FxGridItemSG *firstItem = static_cast<FxGridItemSG*>(visibleItems.first()); - return firstItem->rowPos(); - } else if (modelIndex < visibleIndex) { - FxGridItemSG *firstItem = static_cast<FxGridItemSG*>(visibleItems.first()); - int firstCol = firstItem->colPos() / colSize(); - int col = visibleIndex - modelIndex + (columns - firstCol - 1); - int rows = col / columns; - return firstItem->rowPos() - rows * rowSize(); - } else { - FxGridItemSG *lastItem = static_cast<FxGridItemSG*>(visibleItems.last()); - int count = modelIndex - lastItem->index; - int col = lastItem->colPos() + count * colSize(); - int rows = col / (columns * colSize()); - return lastItem->rowPos() + rows * rowSize(); - } - } - return (modelIndex / columns) * rowSize(); -} - - -qreal QQuickGridViewPrivate::snapPosAt(qreal pos) const -{ - Q_Q(const QQuickGridView); - qreal snapPos = 0; - if (!visibleItems.isEmpty()) { - qreal highlightStart = highlightRangeStart; - pos += highlightStart; - pos += rowSize()/2; - snapPos = static_cast<FxGridItemSG*>(visibleItems.first())->rowPos() - visibleIndex / columns * rowSize(); - snapPos = pos - fmodf(pos - snapPos, qreal(rowSize())); - snapPos -= highlightStart; - qreal maxExtent; - qreal minExtent; - if (isRightToLeftTopToBottom()) { - maxExtent = q->minXExtent()-size(); - minExtent = q->maxXExtent()-size(); - } else { - maxExtent = flow == QQuickGridView::LeftToRight ? -q->maxYExtent() : -q->maxXExtent(); - minExtent = flow == QQuickGridView::LeftToRight ? -q->minYExtent() : -q->minXExtent(); - } - if (snapPos > maxExtent) - snapPos = maxExtent; - if (snapPos < minExtent) - snapPos = minExtent; - } - return snapPos; -} - -FxViewItem *QQuickGridViewPrivate::snapItemAt(qreal pos) const -{ - for (int i = 0; i < visibleItems.count(); ++i) { - FxViewItem *item = visibleItems.at(i); - if (item->index == -1) - continue; - qreal itemTop = item->position(); - if (itemTop+rowSize()/2 >= pos && itemTop - rowSize()/2 <= pos) - return item; - } - return 0; -} - -int QQuickGridViewPrivate::snapIndex() const -{ - int index = currentIndex; - for (int i = 0; i < visibleItems.count(); ++i) { - FxGridItemSG *item = static_cast<FxGridItemSG*>(visibleItems.at(i)); - if (item->index == -1) - continue; - qreal itemTop = item->position(); - FxGridItemSG *hItem = static_cast<FxGridItemSG*>(highlight); - if (itemTop >= hItem->rowPos()-rowSize()/2 && itemTop < hItem->rowPos()+rowSize()/2) { - index = item->index; - if (item->colPos() >= hItem->colPos()-colSize()/2 && item->colPos() < hItem->colPos()+colSize()/2) - return item->index; - } - } - return index; -} - -FxViewItem *QQuickGridViewPrivate::newViewItem(int modelIndex, QQuickItem *item) -{ - Q_Q(QQuickGridView); - Q_UNUSED(modelIndex); - return new FxGridItemSG(item, q, false); -} - -bool QQuickGridViewPrivate::addVisibleItems(qreal fillFrom, qreal fillTo, bool doBuffer) -{ - qreal colPos = colPosAt(visibleIndex); - qreal rowPos = rowPosAt(visibleIndex); - if (visibleItems.count()) { - FxGridItemSG *lastItem = static_cast<FxGridItemSG*>(visibleItems.last()); - rowPos = lastItem->rowPos(); - int colNum = qFloor((lastItem->colPos()+colSize()/2) / colSize()); - if (++colNum >= columns) { - colNum = 0; - rowPos += rowSize(); - } - colPos = colNum * colSize(); - } - - int modelIndex = findLastVisibleIndex(); - modelIndex = modelIndex < 0 ? visibleIndex : modelIndex + 1; - - if (visibleItems.count() && (fillFrom > rowPos + rowSize()*2 - || fillTo < rowPosAt(visibleIndex) - rowSize())) { - // We've jumped more than a page. Estimate which items are now - // visible and fill from there. - int count = (fillFrom - (rowPos + rowSize())) / (rowSize()) * columns; - for (int i = 0; i < visibleItems.count(); ++i) - releaseItem(visibleItems.at(i)); - visibleItems.clear(); - modelIndex += count; - if (modelIndex >= model->count()) - modelIndex = model->count() - 1; - else if (modelIndex < 0) - modelIndex = 0; - modelIndex = modelIndex / columns * columns; - visibleIndex = modelIndex; - colPos = colPosAt(visibleIndex); - rowPos = rowPosAt(visibleIndex); - } - - int colNum = qFloor((colPos+colSize()/2) / colSize()); - FxGridItemSG *item = 0; - bool changed = false; - - while (modelIndex < model->count() && rowPos <= fillTo + rowSize()*(columns - colNum)/(columns+1)) { -// qDebug() << "refill: append item" << modelIndex << colPos << rowPos; - if (!(item = static_cast<FxGridItemSG*>(createItem(modelIndex, doBuffer)))) - break; - item->setPosition(colPos, rowPos); - item->item->setVisible(!doBuffer); - visibleItems.append(item); - if (++colNum >= columns) { - colNum = 0; - rowPos += rowSize(); - } - colPos = colNum * colSize(); - ++modelIndex; - changed = true; - } - - // Find first column - if (visibleItems.count()) { - FxGridItemSG *firstItem = static_cast<FxGridItemSG*>(visibleItems.first()); - rowPos = firstItem->rowPos(); - colNum = qFloor((firstItem->colPos()+colSize()/2) / colSize()); - if (--colNum < 0) { - colNum = columns - 1; - rowPos -= rowSize(); - } - } else { - colNum = qFloor((colPos+colSize()/2) / colSize()); - } - - // Prepend - colPos = colNum * 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 = static_cast<FxGridItemSG*>(createItem(visibleIndex-1, doBuffer)))) - break; - --visibleIndex; - item->setPosition(colPos, rowPos); - item->item->setVisible(!doBuffer); - visibleItems.prepend(item); - if (--colNum < 0) { - colNum = columns-1; - rowPos -= rowSize(); - } - colPos = colNum * colSize(); - changed = true; - } - - return changed; -} - -bool QQuickGridViewPrivate::removeNonVisibleItems(qreal bufferFrom, qreal bufferTo) -{ - Q_Q(QQuickGridView); - FxGridItemSG *item = 0; - bool changed = false; - - while (visibleItems.count() > 1 - && (item = static_cast<FxGridItemSG*>(visibleItems.first())) - && item->rowPos()+rowSize()-1 < 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 = static_cast<FxGridItemSG*>(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; - } - - return changed; -} - -void QQuickGridViewPrivate::visibleItemsChanged() -{ - updateHeader(); - updateFooter(); - updateViewport(); -} - -void QQuickGridViewPrivate::updateViewport() -{ - Q_Q(QQuickGridView); - qreal length = flow == QQuickGridView::LeftToRight ? q->width() : q->height(); - columns = (int)qMax((length + colSize()/2) / colSize(), qreal(1.)); - QQuickItemViewPrivate::updateViewport(); -} - -void QQuickGridViewPrivate::layoutVisibleItems() -{ - if (visibleItems.count()) { - FxGridItemSG *firstItem = static_cast<FxGridItemSG*>(visibleItems.first()); - qreal rowPos = firstItem->rowPos(); - qreal colPos = firstItem->colPos(); - int col = visibleIndex % columns; - if (colPos != col * colSize()) { - colPos = col * colSize(); - firstItem->setPosition(colPos, rowPos); - } - for (int i = 1; i < visibleItems.count(); ++i) { - FxGridItemSG *item = static_cast<FxGridItemSG*>(visibleItems.at(i)); - if (++col >= columns) { - col = 0; - rowPos += rowSize(); - } - colPos = col * colSize(); - item->setPosition(colPos, rowPos); - } - } -} - -void QQuickGridViewPrivate::repositionPackageItemAt(QQuickItem *item, int index) -{ - Q_Q(QQuickGridView); - qreal pos = position(); - if (flow == QQuickGridView::LeftToRight) { - if (item->y() + item->height() > pos && item->y() < pos + q->height()) - item->setPos(QPointF(colPosAt(index), rowPosAt(index))); - } else { - if (item->x() + item->width() > pos && item->x() < pos + q->width()) { - if (isRightToLeftTopToBottom()) - item->setPos(QPointF(-rowPosAt(index)-item->width(), colPosAt(index))); - else - item->setPos(QPointF(rowPosAt(index), colPosAt(index))); - } - } -} - -void QQuickGridViewPrivate::resetItemPosition(FxViewItem *item, FxViewItem *toItem) -{ - if (item == toItem) - return; - FxGridItemSG *toGridItem = static_cast<FxGridItemSG*>(toItem); - static_cast<FxGridItemSG*>(item)->setPosition(toGridItem->colPos(), toGridItem->rowPos()); -} - -void QQuickGridViewPrivate::resetFirstItemPosition() -{ - FxGridItemSG *item = static_cast<FxGridItemSG*>(visibleItems.first()); - item->setPosition(0, 0); -} - -void QQuickGridViewPrivate::moveItemBy(FxViewItem *item, qreal forwards, qreal backwards) -{ - int moveCount = (forwards / rowSize()) - (backwards / rowSize()); - - FxGridItemSG *gridItem = static_cast<FxGridItemSG*>(item); - gridItem->setPosition(gridItem->colPos(), gridItem->rowPos() + ((moveCount / columns) * rowSize())); -} - -void QQuickGridViewPrivate::createHighlight() -{ - Q_Q(QQuickGridView); - bool changed = false; - if (highlight) { - if (trackedItem == highlight) - trackedItem = 0; - delete highlight; - highlight = 0; - - delete highlightXAnimator; - delete highlightYAnimator; - highlightXAnimator = 0; - highlightYAnimator = 0; - - changed = true; - } - - if (currentItem) { - QQuickItem *item = createHighlightItem(); - if (item) { - FxGridItemSG *newHighlight = new FxGridItemSG(item, q, true); - if (autoHighlight) - resetHighlightPosition(); - highlightXAnimator = new QSmoothedAnimation(q); - highlightXAnimator->target = QDeclarativeProperty(item, QLatin1String("x")); - highlightXAnimator->userDuration = highlightMoveDuration; - highlightYAnimator = new QSmoothedAnimation(q); - highlightYAnimator->target = QDeclarativeProperty(item, QLatin1String("y")); - highlightYAnimator->userDuration = highlightMoveDuration; - - highlight = newHighlight; - changed = true; - } - } - if (changed) - emit q->highlightItemChanged(); -} - -void QQuickGridViewPrivate::updateHighlight() -{ - applyPendingChanges(); - - if ((!currentItem && highlight) || (currentItem && !highlight)) - createHighlight(); - bool strictHighlight = haveHighlightRange && highlightRange == QQuickGridView::StrictlyEnforceRange; - if (currentItem && autoHighlight && highlight && (!strictHighlight || !pressed)) { - // auto-update highlight - highlightXAnimator->to = currentItem->item->x(); - highlightYAnimator->to = currentItem->item->y(); - highlight->item->setWidth(currentItem->item->width()); - highlight->item->setHeight(currentItem->item->height()); - - highlightXAnimator->restart(); - highlightYAnimator->restart(); - } - updateTrackedItem(); -} - -void QQuickGridViewPrivate::resetHighlightPosition() -{ - if (highlight && currentItem) { - FxGridItemSG *cItem = static_cast<FxGridItemSG*>(currentItem); - static_cast<FxGridItemSG*>(highlight)->setPosition(cItem->colPos(), cItem->rowPos()); - } -} - -qreal QQuickGridViewPrivate::headerSize() const -{ - if (!header) - return 0.0; - return flow == QQuickGridView::LeftToRight ? header->item->height() : header->item->width(); -} - -qreal QQuickGridViewPrivate::footerSize() const -{ - if (!footer) - return 0.0; - return flow == QQuickGridView::LeftToRight? footer->item->height() : footer->item->width(); -} - -bool QQuickGridViewPrivate::showHeaderForIndex(int index) const -{ - return index / columns == 0; -} - -bool QQuickGridViewPrivate::showFooterForIndex(int index) const -{ - return index / columns == (model->count()-1) / columns; -} - -void QQuickGridViewPrivate::updateFooter() -{ - Q_Q(QQuickGridView); - bool created = false; - if (!footer) { - QQuickItem *item = createComponentItem(footerComponent, true); - if (!item) - return; - item->setZ(1); - footer = new FxGridItemSG(item, q, true); - created = true; - } - - FxGridItemSG *gridItem = static_cast<FxGridItemSG*>(footer); - qreal colOffset = 0; - qreal rowOffset = 0; - if (q->effectiveLayoutDirection() == Qt::RightToLeft) { - if (flow == QQuickGridView::TopToBottom) - rowOffset = gridItem->item->width() - cellWidth; - else - colOffset = gridItem->item->width() - cellWidth; - } - if (visibleItems.count()) { - qreal endPos = lastPosition(); - if (findLastVisibleIndex() == model->count()-1) { - gridItem->setPosition(colOffset, endPos + rowOffset); - } else { - qreal visiblePos = isRightToLeftTopToBottom() ? -position() : position() + size(); - if (endPos <= visiblePos || gridItem->endPosition() <= endPos + rowOffset) - gridItem->setPosition(colOffset, endPos + rowOffset); - } - } else { - gridItem->setPosition(colOffset, rowOffset); - } - - if (created) - emit q->footerItemChanged(); -} - -void QQuickGridViewPrivate::updateHeader() -{ - Q_Q(QQuickGridView); - bool created = false; - if (!header) { - QQuickItem *item = createComponentItem(headerComponent, true); - if (!item) - return; - item->setZ(1); - header = new FxGridItemSG(item, q, true); - created = true; - } - - FxGridItemSG *gridItem = static_cast<FxGridItemSG*>(header); - qreal colOffset = 0; - qreal rowOffset = -headerSize(); - if (q->effectiveLayoutDirection() == Qt::RightToLeft) { - if (flow == QQuickGridView::TopToBottom) - rowOffset += gridItem->item->width()-cellWidth; - else - colOffset = gridItem->item->width()-cellWidth; - } - if (visibleItems.count()) { - qreal startPos = originPosition(); - if (visibleIndex == 0) { - gridItem->setPosition(colOffset, startPos + rowOffset); - } else { - qreal tempPos = isRightToLeftTopToBottom() ? -position()-size() : position(); - qreal headerPos = isRightToLeftTopToBottom() ? gridItem->rowPos() + cellWidth - headerSize() : gridItem->rowPos(); - if (tempPos <= startPos || headerPos > startPos + rowOffset) - gridItem->setPosition(colOffset, startPos + rowOffset); - } - } else { - if (isRightToLeftTopToBottom()) - gridItem->setPosition(colOffset, rowOffset); - else - gridItem->setPosition(colOffset, -headerSize()); - } - - if (created) - emit q->headerItemChanged(); -} - -void QQuickGridViewPrivate::initializeCurrentItem() -{ - if (currentItem && currentIndex >= 0) { - FxGridItemSG *gridItem = static_cast<FxGridItemSG*>(currentItem); - if (gridItem) - gridItem->setPosition(colPosAt(currentIndex), rowPosAt(currentIndex)); - } -} - -void QQuickGridViewPrivate::itemGeometryChanged(QQuickItem *item, const QRectF &newGeometry, const QRectF &oldGeometry) -{ - Q_Q(QQuickGridView); - QQuickItemViewPrivate::itemGeometryChanged(item, newGeometry, oldGeometry); - if (!q->isComponentComplete()) - return; - if (item == q) { - if (newGeometry.height() != oldGeometry.height() || newGeometry.width() != oldGeometry.width()) { - updateViewport(); - forceLayout = true; - q->polish(); - } - } -} - -void QQuickGridViewPrivate::fixupPosition() -{ - moveReason = Other; - if (flow == QQuickGridView::LeftToRight) - fixupY(); - else - fixupX(); -} - -void QQuickGridViewPrivate::fixup(AxisData &data, qreal minExtent, qreal maxExtent) -{ - if ((flow == QQuickGridView::TopToBottom && &data == &vData) - || (flow == QQuickGridView::LeftToRight && &data == &hData)) - return; - - fixupMode = moveReason == Mouse ? fixupMode : Immediate; - - qreal viewPos = isRightToLeftTopToBottom() ? -position()-size() : position(); - - bool strictHighlightRange = haveHighlightRange && highlightRange == QQuickGridView::StrictlyEnforceRange; - if (snapMode != QQuickGridView::NoSnap) { - qreal tempPosition = isRightToLeftTopToBottom() ? -position()-size() : position(); - if (snapMode == QQuickGridView::SnapOneRow && moveReason == Mouse) { - // if we've been dragged < rowSize()/2 then bias towards the next row - qreal dist = data.move.value() - (data.pressPos - data.dragStartOffset); - qreal bias = 0; - if (data.velocity > 0 && dist > QML_FLICK_SNAPONETHRESHOLD && dist < rowSize()/2) - bias = rowSize()/2; - else if (data.velocity < 0 && dist < -QML_FLICK_SNAPONETHRESHOLD && dist > -rowSize()/2) - bias = -rowSize()/2; - if (isRightToLeftTopToBottom()) - bias = -bias; - tempPosition -= bias; - } - FxViewItem *topItem = snapItemAt(tempPosition+highlightRangeStart); - if (!topItem && strictHighlightRange && currentItem) { - // StrictlyEnforceRange always keeps an item in range - updateHighlight(); - topItem = currentItem; - } - FxViewItem *bottomItem = snapItemAt(tempPosition+highlightRangeEnd); - if (!bottomItem && strictHighlightRange && currentItem) { - // StrictlyEnforceRange always keeps an item in range - updateHighlight(); - bottomItem = currentItem; - } - qreal pos; - bool isInBounds = -position() > maxExtent && -position() <= minExtent; - if (topItem && (isInBounds || strictHighlightRange)) { - qreal headerPos = header ? static_cast<FxGridItemSG*>(header)->rowPos() : 0; - if (topItem->index == 0 && header && tempPosition+highlightRangeStart < headerPos+headerSize()/2 && !strictHighlightRange) { - pos = isRightToLeftTopToBottom() ? - headerPos + highlightRangeStart - size() : headerPos - highlightRangeStart; - } else { - if (isRightToLeftTopToBottom()) - pos = qMax(qMin(-topItem->position() + highlightRangeStart - size(), -maxExtent), -minExtent); - else - pos = qMax(qMin(topItem->position() - highlightRangeStart, -maxExtent), -minExtent); - } - } else if (bottomItem && isInBounds) { - if (isRightToLeftTopToBottom()) - pos = qMax(qMin(-bottomItem->position() + highlightRangeEnd - size(), -maxExtent), -minExtent); - else - pos = qMax(qMin(bottomItem->position() - highlightRangeEnd, -maxExtent), -minExtent); - } else { - QQuickItemViewPrivate::fixup(data, minExtent, maxExtent); - return; - } - - qreal dist = qAbs(data.move + pos); - if (dist > 0) { - timeline.reset(data.move); - if (fixupMode != Immediate) { - timeline.move(data.move, -pos, QEasingCurve(QEasingCurve::InOutQuad), fixupDuration/2); - data.fixingUp = true; - } else { - timeline.set(data.move, -pos); - } - vTime = timeline.time(); - } - } else if (haveHighlightRange && highlightRange == QQuickGridView::StrictlyEnforceRange) { - if (currentItem) { - updateHighlight(); - qreal pos = static_cast<FxGridItemSG*>(currentItem)->rowPos(); - if (viewPos < pos + rowSize() - highlightRangeEnd) - viewPos = pos + rowSize() - highlightRangeEnd; - if (viewPos > pos - highlightRangeStart) - viewPos = pos - highlightRangeStart; - if (isRightToLeftTopToBottom()) - viewPos = -viewPos-size(); - timeline.reset(data.move); - if (viewPos != position()) { - if (fixupMode != Immediate) { - timeline.move(data.move, -viewPos, QEasingCurve(QEasingCurve::InOutQuad), fixupDuration/2); - data.fixingUp = true; - } else { - timeline.set(data.move, -viewPos); - } - } - vTime = timeline.time(); - } - } else { - QQuickItemViewPrivate::fixup(data, minExtent, maxExtent); - } - data.inOvershoot = false; - fixupMode = Normal; -} - -void QQuickGridViewPrivate::flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize, - QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity) -{ - Q_Q(QQuickGridView); - data.fixingUp = false; - moveReason = Mouse; - if ((!haveHighlightRange || highlightRange != QQuickGridView::StrictlyEnforceRange) - && snapMode == QQuickGridView::NoSnap) { - QQuickItemViewPrivate::flick(data, minExtent, maxExtent, vSize, fixupCallback, velocity); - return; - } - qreal maxDistance = 0; - qreal dataValue = isRightToLeftTopToBottom() ? -data.move.value()+size() : data.move.value(); - // -ve velocity means list is moving up/left - if (velocity > 0) { - if (data.move.value() < minExtent) { - if (snapMode == QQuickGridView::SnapOneRow) { - // if we've been dragged < averageSize/2 then bias towards the next item - qreal dist = data.move.value() - (data.pressPos - data.dragStartOffset); - qreal bias = dist < rowSize()/2 ? rowSize()/2 : 0; - if (isRightToLeftTopToBottom()) - bias = -bias; - data.flickTarget = -snapPosAt(-dataValue - bias); - maxDistance = qAbs(data.flickTarget - data.move.value()); - velocity = maxVelocity; - } else { - maxDistance = qAbs(minExtent - data.move.value()); - } - } - if (snapMode == QQuickGridView::NoSnap && highlightRange != QQuickGridView::StrictlyEnforceRange) - data.flickTarget = minExtent; - } else { - if (data.move.value() > maxExtent) { - if (snapMode == QQuickGridView::SnapOneRow) { - // if we've been dragged < averageSize/2 then bias towards the next item - qreal dist = data.move.value() - (data.pressPos - data.dragStartOffset); - qreal bias = -dist < rowSize()/2 ? rowSize()/2 : 0; - if (isRightToLeftTopToBottom()) - bias = -bias; - data.flickTarget = -snapPosAt(-dataValue + bias); - maxDistance = qAbs(data.flickTarget - data.move.value()); - velocity = -maxVelocity; - } else { - maxDistance = qAbs(maxExtent - data.move.value()); - } - } - if (snapMode == QQuickGridView::NoSnap && highlightRange != QQuickGridView::StrictlyEnforceRange) - data.flickTarget = maxExtent; - } - bool overShoot = boundsBehavior == QQuickFlickable::DragAndOvershootBounds; - if (maxDistance > 0 || overShoot) { - // This mode requires the grid to stop exactly on a row boundary. - qreal v = velocity; - if (maxVelocity != -1 && maxVelocity < qAbs(v)) { - if (v < 0) - v = -maxVelocity; - else - v = maxVelocity; - } - qreal accel = deceleration; - qreal v2 = v * v; - qreal overshootDist = 0.0; - if ((maxDistance > 0.0 && v2 / (2.0f * maxDistance) < accel) || snapMode == QQuickGridView::SnapOneRow) { - // + rowSize()/4 to encourage moving at least one item in the flick direction - qreal dist = v2 / (accel * 2.0) + rowSize()/4; - dist = qMin(dist, maxDistance); - if (v > 0) - dist = -dist; - if (snapMode != QQuickGridView::SnapOneRow) { - qreal distTemp = isRightToLeftTopToBottom() ? -dist : dist; - data.flickTarget = -snapPosAt(-dataValue + distTemp); - } - data.flickTarget = isRightToLeftTopToBottom() ? -data.flickTarget+size() : data.flickTarget; - if (overShoot) { - if (data.flickTarget >= minExtent) { - overshootDist = overShootDistance(vSize); - data.flickTarget += overshootDist; - } else if (data.flickTarget <= maxExtent) { - overshootDist = overShootDistance(vSize); - data.flickTarget -= overshootDist; - } - } - qreal adjDist = -data.flickTarget + data.move.value(); - if (qAbs(adjDist) > qAbs(dist)) { - // Prevent painfully slow flicking - adjust velocity to suit flickDeceleration - qreal adjv2 = accel * 2.0f * qAbs(adjDist); - if (adjv2 > v2) { - v2 = adjv2; - v = qSqrt(v2); - if (dist > 0) - v = -v; - } - } - dist = adjDist; - accel = v2 / (2.0f * qAbs(dist)); - } else { - data.flickTarget = velocity > 0 ? minExtent : maxExtent; - overshootDist = overShoot ? overShootDistance(vSize) : 0; - } - timeline.reset(data.move); - timeline.accel(data.move, v, accel, maxDistance + overshootDist); - timeline.callback(QDeclarativeTimeLineCallback(&data.move, fixupCallback, this)); - if (!hData.flicking && q->xflick()) { - hData.flicking = true; - emit q->flickingChanged(); - emit q->flickingHorizontallyChanged(); - emit q->flickStarted(); - } - if (!vData.flicking && q->yflick()) { - vData.flicking = true; - emit q->flickingChanged(); - emit q->flickingVerticallyChanged(); - emit q->flickStarted(); - } - } else { - timeline.reset(data.move); - fixup(data, minExtent, maxExtent); - } -} - - -//---------------------------------------------------------------------------- -/*! - \qmlclass GridView QQuickGridView - \inqmlmodule QtQuick 2 - \ingroup qml-view-elements - - \inherits Flickable - \brief The GridView item provides a grid view of items provided by a model. - - A GridView displays data from models created from built-in QML elements like ListModel - and XmlListModel, or custom model classes defined in C++ that inherit from - QAbstractListModel. - - A GridView has a \l model, which defines the data to be displayed, and - a \l delegate, which defines how the data should be displayed. Items in a - GridView are laid out horizontally or vertically. Grid views are inherently flickable - as GridView inherits from \l Flickable. - - \section1 Example Usage - - The following example shows the definition of a simple list model defined - in a file called \c ContactModel.qml: - - \snippet doc/src/snippets/declarative/gridview/ContactModel.qml 0 - - \div {class="float-right"} - \inlineimage gridview-simple.png - \enddiv - - This model can be referenced as \c ContactModel in other QML files. See \l{QML Modules} - for more information about creating reusable components like this. - - Another component can display this model data in a GridView, as in the following - example, which creates a \c ContactModel component for its model, and a \l Column element - (containing \l Image and \l Text elements) for its delegate. - - \clearfloat - \snippet doc/src/snippets/declarative/gridview/gridview.qml import - \codeline - \snippet doc/src/snippets/declarative/gridview/gridview.qml classdocs simple - - \div {class="float-right"} - \inlineimage gridview-highlight.png - \enddiv - - The view will create a new delegate for each item in the model. Note that the delegate - is able to access the model's \c name and \c portrait data directly. - - An improved grid view is shown below. The delegate is visually improved and is moved - into a separate \c contactDelegate component. - - \clearfloat - \snippet doc/src/snippets/declarative/gridview/gridview.qml classdocs advanced - - The currently selected item is highlighted with a blue \l Rectangle using the \l highlight property, - and \c focus is set to \c true to enable keyboard navigation for the grid view. - The grid view itself is a focus scope (see \l{qmlfocus#Acquiring Focus and Focus Scopes}{the focus documentation page} for more details). - - Delegates are instantiated as needed and may be destroyed at any time. - State should \e never be stored in a delegate. - - GridView attaches a number of properties to the root item of the delegate, for example - \c {GridView.isCurrentItem}. In the following example, the root delegate item can access - this attached property directly as \c GridView.isCurrentItem, while the child - \c contactInfo object must refer to this property as \c wrapper.GridView.isCurrentItem. - - \snippet doc/src/snippets/declarative/gridview/gridview.qml isCurrentItem - - \note Views do not set the \l{Item::}{clip} property automatically. - If the view is not clipped by another item or the screen, it will be necessary - to set this property to true in order to clip the items that are partially or - fully outside the view. - - \sa {declarative/modelviews/gridview}{GridView example} -*/ - -QQuickGridView::QQuickGridView(QQuickItem *parent) - : QQuickItemView(*(new QQuickGridViewPrivate), parent) -{ -} - -QQuickGridView::~QQuickGridView() -{ -} - -void QQuickGridView::setHighlightFollowsCurrentItem(bool autoHighlight) -{ - Q_D(QQuickGridView); - if (d->autoHighlight != autoHighlight) { - if (!autoHighlight && d->highlightXAnimator) { - d->highlightXAnimator->stop(); - d->highlightYAnimator->stop(); - } - QQuickItemView::setHighlightFollowsCurrentItem(autoHighlight); - } -} - -/*! - \qmlattachedproperty bool QtQuick2::GridView::isCurrentItem - This attached property is true if this delegate is the current item; otherwise false. - - It is attached to each instance of the delegate. -*/ - -/*! - \qmlattachedproperty GridView QtQuick2::GridView::view - This attached property holds the view that manages this delegate instance. - - It is attached to each instance of the delegate. - - \snippet doc/src/snippets/declarative/gridview/gridview.qml isCurrentItem -*/ - -/*! - \qmlattachedproperty bool QtQuick2::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. - - \snippet doc/src/snippets/declarative/gridview/gridview.qml delayRemove -*/ - -/*! - \qmlattachedsignal QtQuick2::GridView::onAdd() - This attached handler is called immediately after an item is added to the view. -*/ - -/*! - \qmlattachedsignal QtQuick2::GridView::onRemove() - This attached handler is called immediately before an item is removed from the view. -*/ - - -/*! - \qmlproperty model QtQuick2::GridView::model - This property holds the model providing data for the grid. - - The model provides the set of data that is used to create the items - in the view. Models can be created directly in QML using \l ListModel, \l XmlListModel - or \l VisualItemModel, or provided by C++ model classes. If a C++ model class is - used, it must be a subclass of \l QAbstractItemModel or a simple list. - - \sa {qmlmodels}{Data Models} -*/ - -/*! - \qmlproperty Component QtQuick2::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}. - - The number of elements in the delegate has a direct effect on the - flicking performance of the view. If at all possible, place functionality - that is not needed for the normal display of the delegate in a \l Loader which - can load additional elements when needed. - - The GridView will layout the items based on the size of the root item - in the delegate. - - \note Delegates are instantiated as needed and may be destroyed at any time. - State should \e never be stored in a delegate. -*/ - -/*! - \qmlproperty int QtQuick2::GridView::currentIndex - \qmlproperty Item QtQuick2::GridView::currentItem - - The \c currentIndex property holds the index of the current item, and - \c currentItem holds the current item. Setting the currentIndex to -1 - will clear the highlight and set currentItem to null. - - If highlightFollowsCurrentItem is \c true, setting either of these - properties will smoothly scroll the GridView so that the current - item becomes visible. - - Note that the position of the current item - may only be approximate until it becomes visible in the view. -*/ - - -/*! - \qmlproperty Item QtQuick2::GridView::highlightItem - - This holds the highlight item created from the \l highlight component. - - The highlightItem is managed by the view unless - \l highlightFollowsCurrentItem is set to false. - - \sa highlight, highlightFollowsCurrentItem -*/ - - -/*! - \qmlproperty int QtQuick2::GridView::count - This property holds the number of items in the view. -*/ - - -/*! - \qmlproperty Component QtQuick2::GridView::highlight - This property holds the component to use as the highlight. - - An instance of the highlight component is created for each view. - The geometry of the resulting component instance will be managed by the view - so as to stay with the current item, unless the highlightFollowsCurrentItem property is false. - - \sa highlightItem, highlightFollowsCurrentItem -*/ - -/*! - \qmlproperty bool QtQuick2::GridView::highlightFollowsCurrentItem - This property sets whether the highlight is managed by the view. - - If this property is true (the default value), the highlight is moved smoothly - to follow the current item. Otherwise, the - highlight is not moved by the view, and any movement must be implemented - by the highlight. - - Here is a highlight with its motion defined by a \l {SpringAnimation} item: - - \snippet doc/src/snippets/declarative/gridview/gridview.qml highlightFollowsCurrentItem -*/ - - -/*! - \qmlproperty int QtQuick2::GridView::highlightMoveDuration - This property holds the move animation duration of the highlight delegate. - - highlightFollowsCurrentItem must be true for this property - to have effect. - - The default value for the duration is 150ms. - - \sa highlightFollowsCurrentItem -*/ - -/*! - \qmlproperty real QtQuick2::GridView::preferredHighlightBegin - \qmlproperty real QtQuick2::GridView::preferredHighlightEnd - \qmlproperty enumeration QtQuick2::GridView::highlightRangeMode - - These properties define the preferred range of the highlight (for the current item) - within the view. The \c preferredHighlightBegin value must be less than the - \c preferredHighlightEnd value. - - These properties affect the position of the current item when the view is scrolled. - For example, if the currently selected item should stay in the middle of the - view when it is scrolled, set the \c preferredHighlightBegin and - \c preferredHighlightEnd values to the top and bottom coordinates of where the middle - item would be. If the \c currentItem is changed programmatically, the view will - automatically scroll so that the current item is in the middle of the view. - Furthermore, the behavior of the current item index will occur whether or not a - highlight exists. - - Valid values for \c highlightRangeMode are: - - \list - \o GridView.ApplyRange - the view attempts to maintain the highlight within the range. - However, the highlight can move outside of the range at the ends of the view or due - to mouse interaction. - \o GridView.StrictlyEnforceRange - the highlight never moves outside of the range. - The current item changes if a keyboard or mouse action would cause the highlight to move - outside of the range. - \o GridView.NoHighlightRange - this is the default value. - \endlist -*/ - - -/*! - \qmlproperty enumeration QtQuick2::GridView::layoutDirection - This property holds the layout direction of the grid. - - Possible values: - - \list - \o Qt.LeftToRight (default) - Items will be laid out starting in the top, left corner. The flow is - dependent on the \l GridView::flow property. - \o Qt.RightToLeft - Items will be laid out starting in the top, right corner. The flow is dependent - on the \l GridView::flow property. - \endlist - - \bold Note: If GridView::flow is set to GridView.LeftToRight, this is not to be confused if - GridView::layoutDirection is set to Qt.RightToLeft. The GridView.LeftToRight flow value simply - indicates that the flow is horizontal. -*/ - - -/*! - \qmlproperty enumeration QtQuick2::GridView::effectiveLayoutDirection - This property holds the effective layout direction of the grid. - - When using the attached property \l {LayoutMirroring::enabled}{LayoutMirroring::enabled} for locale layouts, - the visual layout direction of the grid will be mirrored. However, the - property \l {GridView::layoutDirection}{layoutDirection} will remain unchanged. - - \sa GridView::layoutDirection, {LayoutMirroring}{LayoutMirroring} -*/ -/*! - \qmlproperty bool QtQuick2::GridView::keyNavigationWraps - This property holds whether the grid wraps key navigation - - If this is true, key navigation that would move the current item selection - past one end of the view instead wraps around and moves the selection to - the other end of the view. - - By default, key navigation is not wrapped. -*/ -/*! - \qmlproperty int QtQuick2::GridView::cacheBuffer - This property determines whether delegates are retained outside the - visible area of the view. - - If non-zero the view may keep as many delegates - instantiated as will fit within the buffer specified. For example, - if in a vertical view the delegate is 20 pixels high, there are 3 - columns and \c cacheBuffer is - set to 40, then up to 6 delegates above and 6 delegates below the visible - area may be created/retained. The buffered delegates are created asynchronously, - allowing creation to occur across multiple frames and reducing the - likelihood of skipping frames. In order to improve painting performance - delegates outside the visible area have their \l visible property set to - false until they are moved into the visible area. - - Note that cacheBuffer is not a pixel buffer - it only maintains additional - instantiated delegates. - - Setting this value can make scrolling the list smoother at the expense - of additional memory usage. It is not a substitute for creating efficient - delegates; the fewer elements in a delegate, the faster a view may be - scrolled. -*/ -void QQuickGridView::setHighlightMoveDuration(int duration) -{ - Q_D(QQuickGridView); - if (d->highlightMoveDuration != duration) { - if (d->highlightYAnimator) { - d->highlightXAnimator->userDuration = duration; - d->highlightYAnimator->userDuration = duration; - } - QQuickItemView::setHighlightMoveDuration(duration); - } -} - -/*! - \qmlproperty enumeration QtQuick2::GridView::flow - This property holds the flow of the grid. - - Possible values: - - \list - \o GridView.LeftToRight (default) - Items are laid out from left to right, and the view scrolls vertically - \o GridView.TopToBottom - Items are laid out from top to bottom, and the view scrolls horizontally - \endlist -*/ -QQuickGridView::Flow QQuickGridView::flow() const -{ - Q_D(const QQuickGridView); - return d->flow; -} - -void QQuickGridView::setFlow(Flow flow) -{ - Q_D(QQuickGridView); - if (d->flow != flow) { - d->flow = flow; - if (d->flow == LeftToRight) { - setContentWidth(-1); - setFlickableDirection(VerticalFlick); - } else { - setContentHeight(-1); - setFlickableDirection(HorizontalFlick); - } - setContentX(0); - setContentY(0); - d->regenerate(); - emit flowChanged(); - } -} - - -/*! - \qmlproperty real QtQuick2::GridView::cellWidth - \qmlproperty real QtQuick2::GridView::cellHeight - - These properties holds the width and height of each cell in the grid. - - The default cell size is 100x100. -*/ -qreal QQuickGridView::cellWidth() const -{ - Q_D(const QQuickGridView); - return d->cellWidth; -} - -void QQuickGridView::setCellWidth(qreal cellWidth) -{ - Q_D(QQuickGridView); - if (cellWidth != d->cellWidth && cellWidth > 0) { - d->cellWidth = qMax(qreal(1), cellWidth); - d->updateViewport(); - emit cellWidthChanged(); - d->forceLayout = true; - d->layout(); - } -} - -qreal QQuickGridView::cellHeight() const -{ - Q_D(const QQuickGridView); - return d->cellHeight; -} - -void QQuickGridView::setCellHeight(qreal cellHeight) -{ - Q_D(QQuickGridView); - if (cellHeight != d->cellHeight && cellHeight > 0) { - d->cellHeight = qMax(qreal(1), cellHeight); - d->updateViewport(); - emit cellHeightChanged(); - d->forceLayout = true; - d->layout(); - } -} -/*! - \qmlproperty enumeration QtQuick2::GridView::snapMode - - This property determines how the view scrolling will settle following a drag or flick. - The possible values are: - - \list - \o GridView.NoSnap (default) - the view stops anywhere within the visible area. - \o GridView.SnapToRow - the view settles with a row (or column for \c GridView.TopToBottom flow) - aligned with the start of the view. - \o GridView.SnapOneRow - the view will settle no more than one row (or column for \c GridView.TopToBottom flow) - away from the first visible row at the time the mouse button is released. - This mode is particularly useful for moving one page at a time. - \endlist - -*/ -QQuickGridView::SnapMode QQuickGridView::snapMode() const -{ - Q_D(const QQuickGridView); - return d->snapMode; -} - -void QQuickGridView::setSnapMode(SnapMode mode) -{ - Q_D(QQuickGridView); - if (d->snapMode != mode) { - d->snapMode = mode; - emit snapModeChanged(); - } -} - - -/*! - \qmlproperty Component QtQuick2::GridView::footer - This property holds the component to use as the footer. - - An instance of the footer component is created for each view. The - footer is positioned at the end of the view, after any items. - - \sa header -*/ -/*! - \qmlproperty Component QtQuick2::GridView::header - This property holds the component to use as the header. - - An instance of the header component is created for each view. The - header is positioned at the beginning of the view, before any items. - - \sa footer -*/ -void QQuickGridView::viewportMoved() -{ - Q_D(QQuickGridView); - QQuickItemView::viewportMoved(); - if (!d->itemCount) - return; - if (d->inViewportMoved) - return; - d->inViewportMoved = true; - - // Set visibility of items to eliminate cost of items outside the visible area. - qreal from = d->isContentFlowReversed() ? -d->position()-d->size() : d->position(); - qreal to = d->isContentFlowReversed() ? -d->position() : d->position()+d->size(); - for (int i = 0; i < d->visibleItems.count(); ++i) { - FxGridItemSG *item = static_cast<FxGridItemSG*>(d->visibleItems.at(i)); - item->item->setVisible(item->rowPos() + d->rowSize() >= from && item->rowPos() <= to); - } - - if (yflick()) - d->bufferMode = d->vData.smoothVelocity < 0 ? QQuickItemViewPrivate::BufferBefore : QQuickItemViewPrivate::BufferAfter; - else if (d->isRightToLeftTopToBottom()) - d->bufferMode = d->hData.smoothVelocity < 0 ? QQuickItemViewPrivate::BufferAfter : QQuickItemViewPrivate::BufferBefore; - else - d->bufferMode = d->hData.smoothVelocity < 0 ? QQuickItemViewPrivate::BufferBefore : QQuickItemViewPrivate::BufferAfter; - - d->refill(); - if (d->hData.flicking || d->vData.flicking || d->hData.moving || d->vData.moving) - d->moveReason = QQuickGridViewPrivate::Mouse; - if (d->moveReason != QQuickGridViewPrivate::SetIndex) { - if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange && d->highlight) { - // reposition highlight - qreal pos = d->highlight->position(); - qreal viewPos = d->isRightToLeftTopToBottom() ? -d->position()-d->size() : d->position(); - if (pos > viewPos + d->highlightRangeEnd - d->highlight->size()) - pos = viewPos + d->highlightRangeEnd - d->highlight->size(); - if (pos < viewPos + d->highlightRangeStart) - pos = viewPos + d->highlightRangeStart; - - if (pos != d->highlight->position()) { - d->highlightXAnimator->stop(); - d->highlightYAnimator->stop(); - static_cast<FxGridItemSG*>(d->highlight)->setPosition(static_cast<FxGridItemSG*>(d->highlight)->colPos(), pos); - } else { - d->updateHighlight(); - } - - // update current index - int idx = d->snapIndex(); - if (idx >= 0 && idx != d->currentIndex) { - d->updateCurrent(idx); - if (d->currentItem && static_cast<FxGridItemSG*>(d->currentItem)->colPos() != static_cast<FxGridItemSG*>(d->highlight)->colPos() && d->autoHighlight) { - if (d->flow == LeftToRight) - d->highlightXAnimator->to = d->currentItem->item->x(); - else - d->highlightYAnimator->to = d->currentItem->item->y(); - } - } - } - } - - d->inViewportMoved = false; -} - -void QQuickGridView::keyPressEvent(QKeyEvent *event) -{ - Q_D(QQuickGridView); - if (d->model && d->model->count() && d->interactive) { - d->moveReason = QQuickGridViewPrivate::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; - } - } - event->ignore(); - QQuickItemView::keyPressEvent(event); -} -/*! - \qmlmethod QtQuick2::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. This method has no effect if the \l count is zero. - - \bold Note: methods should only be called after the Component has completed. -*/ - - -void QQuickGridView::moveCurrentIndexUp() -{ - Q_D(QQuickGridView); - const int count = d->model ? d->model->count() : 0; - if (!count) - return; - if (d->flow == QQuickGridView::LeftToRight) { - if (currentIndex() >= d->columns || d->wrap) { - int index = currentIndex() - d->columns; - setCurrentIndex((index >= 0 && index < count) ? index : count-1); - } - } else { - if (currentIndex() > 0 || d->wrap) { - int index = currentIndex() - 1; - setCurrentIndex((index >= 0 && index < count) ? index : count-1); - } - } -} - -/*! - \qmlmethod QtQuick2::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. This method has no effect if the \l count is zero. - - \bold Note: methods should only be called after the Component has completed. -*/ -void QQuickGridView::moveCurrentIndexDown() -{ - Q_D(QQuickGridView); - const int count = d->model ? d->model->count() : 0; - if (!count) - return; - if (d->flow == QQuickGridView::LeftToRight) { - if (currentIndex() < count - d->columns || d->wrap) { - int index = currentIndex()+d->columns; - setCurrentIndex((index >= 0 && index < count) ? index : 0); - } - } else { - if (currentIndex() < count - 1 || d->wrap) { - int index = currentIndex() + 1; - setCurrentIndex((index >= 0 && index < count) ? index : 0); - } - } -} - -/*! - \qmlmethod QtQuick2::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. This method has no effect if the \l count is zero. - - \bold Note: methods should only be called after the Component has completed. -*/ -void QQuickGridView::moveCurrentIndexLeft() -{ - Q_D(QQuickGridView); - const int count = d->model ? d->model->count() : 0; - if (!count) - return; - if (effectiveLayoutDirection() == Qt::LeftToRight) { - if (d->flow == QQuickGridView::LeftToRight) { - if (currentIndex() > 0 || d->wrap) { - int index = currentIndex() - 1; - setCurrentIndex((index >= 0 && index < count) ? index : count-1); - } - } else { - if (currentIndex() >= d->columns || d->wrap) { - int index = currentIndex() - d->columns; - setCurrentIndex((index >= 0 && index < count) ? index : count-1); - } - } - } else { - if (d->flow == QQuickGridView::LeftToRight) { - if (currentIndex() < count - 1 || d->wrap) { - int index = currentIndex() + 1; - setCurrentIndex((index >= 0 && index < count) ? index : 0); - } - } else { - if (currentIndex() < count - d->columns || d->wrap) { - int index = currentIndex() + d->columns; - setCurrentIndex((index >= 0 && index < count) ? index : 0); - } - } - } -} - - -/*! - \qmlmethod QtQuick2::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. This method has no effect if the \l count is zero. - - \bold Note: methods should only be called after the Component has completed. -*/ -void QQuickGridView::moveCurrentIndexRight() -{ - Q_D(QQuickGridView); - const int count = d->model ? d->model->count() : 0; - if (!count) - return; - if (effectiveLayoutDirection() == Qt::LeftToRight) { - if (d->flow == QQuickGridView::LeftToRight) { - if (currentIndex() < count - 1 || d->wrap) { - int index = currentIndex() + 1; - setCurrentIndex((index >= 0 && index < count) ? index : 0); - } - } else { - if (currentIndex() < count - d->columns || d->wrap) { - int index = currentIndex()+d->columns; - setCurrentIndex((index >= 0 && index < count) ? index : 0); - } - } - } else { - if (d->flow == QQuickGridView::LeftToRight) { - if (currentIndex() > 0 || d->wrap) { - int index = currentIndex() - 1; - setCurrentIndex((index >= 0 && index < count) ? index : count-1); - } - } else { - if (currentIndex() >= d->columns || d->wrap) { - int index = currentIndex() - d->columns; - setCurrentIndex((index >= 0 && index < count) ? index : count-1); - } - } - } -} - -bool QQuickGridViewPrivate::applyInsertionChange(const QDeclarativeChangeSet::Insert &change, FxViewItem *firstVisible, InsertionsResult *insertResult) -{ - Q_Q(QQuickGridView); - - int modelIndex = change.index; - int count = change.count; - - int index = visibleItems.count() ? mapFromModel(modelIndex) : 0; - - if (index < 0) { - int i = visibleItems.count() - 1; - while (i > 0 && visibleItems.at(i)->index == -1) - --i; - if (visibleItems.at(i)->index + 1 == modelIndex) { - // Special case of appending an item to the model. - index = visibleItems.count(); - } else { - if (modelIndex <= visibleIndex) { - // Insert before visible items - visibleIndex += count; - for (int i = 0; i < visibleItems.count(); ++i) { - FxViewItem *item = visibleItems.at(i); - if (item->index != -1 && item->index >= modelIndex) - item->index += count; - } - } - return true; - } - } - - qreal tempPos = isRightToLeftTopToBottom() ? -position()-size()+q->width()+1 : position(); - qreal colPos = 0; - qreal rowPos = 0; - int colNum = 0; - if (visibleItems.count()) { - if (index < visibleItems.count()) { - FxGridItemSG *gridItem = static_cast<FxGridItemSG*>(visibleItems.at(index)); - colPos = gridItem->colPos(); - rowPos = gridItem->rowPos(); - colNum = qFloor((colPos+colSize()/2) / colSize()); - } else { - // appending items to visible list - FxGridItemSG *gridItem = static_cast<FxGridItemSG*>(visibleItems.at(index-1)); - rowPos = gridItem->rowPos(); - colNum = qFloor((gridItem->colPos()+colSize()/2) / colSize()); - if (++colNum >= columns) { - colNum = 0; - rowPos += rowSize(); - } - colPos = colNum * colSize(); - } - } - - // Update the indexes of the following visible items. - for (int i = 0; i < visibleItems.count(); ++i) { - FxViewItem *item = visibleItems.at(i); - if (item->index != -1 && item->index >= modelIndex) - item->index += count; - } - - int prevAddedCount = insertResult->addedItems.count(); - if (firstVisible && rowPos < firstVisible->position()) { - // Insert items before the visible item. - int insertionIdx = index; - int i = count - 1; - int from = tempPos - buffer; - - while (i >= 0) { - if (rowPos > from && insertionIdx < visibleIndex) { - // item won't be visible, just note the size for repositioning - insertResult->sizeAddedBeforeVisible += rowSize(); - } else { - // item is before first visible e.g. in cache buffer - FxViewItem *item = 0; - if (change.isMove() && (item = currentChanges.removedItems.take(change.moveKey(modelIndex + i)))) { - if (item->index > modelIndex + i) - insertResult->movedBackwards.append(item); - item->index = modelIndex + i; - } - if (!item) - item = createItem(modelIndex + i); - if (!item) - return false; - - item->item->setVisible(true); - visibleItems.insert(insertionIdx, item); - if (!change.isMove()) { - insertResult->addedItems.append(item); - insertResult->sizeAddedBeforeVisible += rowSize(); - } - } - - if (--colNum < 0 ) { - colNum = columns - 1; - rowPos -= rowSize(); - } - colPos = colNum * colSize(); - index++; - i--; - } - } else { - int i = 0; - int to = buffer+tempPos+size()-1; - while (i < count && rowPos <= to + rowSize()*(columns - (colPos/colSize()))/qreal(columns)) { - FxViewItem *item = 0; - if (change.isMove() && (item = currentChanges.removedItems.take(change.moveKey(modelIndex + i)))) { - if (item->index > modelIndex + i) - insertResult->movedBackwards.append(item); - item->index = modelIndex + i; - } - if (!item) - item = createItem(modelIndex + i); - if (!item) - return false; - - item->item->setVisible(true); - visibleItems.insert(index, item); - if (!change.isMove()) - insertResult->addedItems.append(item); - if (++colNum >= columns) { - colNum = 0; - rowPos += rowSize(); - } - colPos = colNum * colSize(); - ++index; - ++i; - } - } - - updateVisibleIndex(); - - return insertResult->addedItems.count() > prevAddedCount; -} - -bool QQuickGridViewPrivate::needsRefillForAddedOrRemovedIndex(int modelIndex) const -{ - // If we add or remove items before visible items, a layout may be - // required to ensure item 0 is in the first column. - return modelIndex < visibleIndex; -} - -/*! - \qmlmethod QtQuick2::GridView::positionViewAtIndex(int index, PositionMode mode) - - Positions the view such that the \a index is at the position specified by - \a mode: - - \list - \o GridView.Beginning - position item at the top (or left for \c GridView.TopToBottom flow) of the view. - \o GridView.Center - position item in the center of the view. - \o GridView.End - position item at bottom (or right for horizontal orientation) of the view. - \o GridView.Visible - if any part of the item is visible then take no action, otherwise - bring the item into view. - \o GridView.Contain - ensure the entire item is visible. If the item is larger than - the view the item is positioned at the top (or left for \c GridView.TopToBottom flow) of the view. - \endlist - - If positioning the view at the index would cause empty space to be displayed at - the beginning or end of the view, the view will be positioned at the boundary. - - It is not recommended to use \l {Flickable::}{contentX} or \l {Flickable::}{contentY} to position the view - at a particular index. This is unreliable since removing items from the start - of the view does not cause all other items to be repositioned. - The correct way to bring an item into view is with \c positionViewAtIndex. - - \bold Note: methods should only be called after the Component has completed. To position - the view at startup, this method should be called by Component.onCompleted. For - example, to position the view at the end: - - \code - Component.onCompleted: positionViewAtIndex(count - 1, GridView.Beginning) - \endcode -*/ - -/*! - \qmlmethod QtQuick2::GridView::positionViewAtBeginning() - \qmlmethod QtQuick2::GridView::positionViewAtEnd() - - Positions the view at the beginning or end, taking into account any header or footer. - - It is not recommended to use \l {Flickable::}{contentX} or \l {Flickable::}{contentY} to position the view - at a particular index. This is unreliable since removing items from the start - of the list does not cause all other items to be repositioned, and because - the actual start of the view can vary based on the size of the delegates. - - \bold Note: methods should only be called after the Component has completed. To position - the view at startup, this method should be called by Component.onCompleted. For - example, to position the view at the end on startup: - - \code - Component.onCompleted: positionViewAtEnd() - \endcode -*/ - -/*! - \qmlmethod int QtQuick2::GridView::indexAt(int x, int y) - - Returns the index of the visible item containing the point \a x, \a y in content - coordinates. If there is no item at the point specified, or the item is - not visible -1 is returned. - - If the item is outside the visible area, -1 is returned, regardless of - whether an item will exist at that point when scrolled into view. - - \bold Note: methods should only be called after the Component has completed. -*/ - -QQuickGridViewAttached *QQuickGridView::qmlAttachedProperties(QObject *obj) -{ - return new QQuickGridViewAttached(obj); -} - -QT_END_NAMESPACE |