diff options
Diffstat (limited to 'src/declarative/graphicsitems/qdeclarativegridview.cpp')
| -rw-r--r-- | src/declarative/graphicsitems/qdeclarativegridview.cpp | 245 |
1 files changed, 150 insertions, 95 deletions
diff --git a/src/declarative/graphicsitems/qdeclarativegridview.cpp b/src/declarative/graphicsitems/qdeclarativegridview.cpp index 4c04a6b..694130b 100644 --- a/src/declarative/graphicsitems/qdeclarativegridview.cpp +++ b/src/declarative/graphicsitems/qdeclarativegridview.cpp @@ -331,11 +331,14 @@ public: } } } else if ((header && header->item == item) || (footer && footer->item == item)) { - updateHeader(); - updateFooter(); + if (header) + updateHeader(); + if (footer) + updateFooter(); } } + void positionViewAtIndex(int index, int mode); virtual void fixup(AxisData &data, qreal minExtent, qreal maxExtent); virtual void flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize, QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity); @@ -1095,9 +1098,9 @@ void QDeclarativeGridViewPrivate::flick(AxisData &data, qreal minExtent, qreal m \snippet doc/src/snippets/declarative/gridview/ContactModel.qml 0 - \beginfloatright + \div {float-right} \inlineimage gridview-simple.png - \endfloat + \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. @@ -1111,9 +1114,9 @@ void QDeclarativeGridViewPrivate::flick(AxisData &data, qreal minExtent, qreal m \codeline \snippet doc/src/snippets/declarative/gridview/gridview.qml classdocs simple - \beginfloatright + \div {float-right} \inlineimage gridview-highlight.png - \endfloat + \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. @@ -1615,6 +1618,8 @@ void QDeclarativeGridView::setFlow(Flow flow) setContentHeight(-1); setFlickableDirection(QDeclarativeFlickable::HorizontalFlick); } + setContentX(0); + setContentY(0); d->clear(); d->updateGrid(); refill(); @@ -1776,6 +1781,9 @@ void QDeclarativeGridView::setFooter(QDeclarativeComponent *footer) Q_D(QDeclarativeGridView); if (d->footerComponent != footer) { if (d->footer) { + if (scene()) + scene()->removeItem(d->footer->item); + d->footer->item->deleteLater(); delete d->footer; d->footer = 0; } @@ -1783,6 +1791,7 @@ void QDeclarativeGridView::setFooter(QDeclarativeComponent *footer) if (isComponentComplete()) { d->updateFooter(); d->updateGrid(); + d->fixupPosition(); } emit footerChanged(); } @@ -1808,6 +1817,9 @@ void QDeclarativeGridView::setHeader(QDeclarativeComponent *header) Q_D(QDeclarativeGridView); if (d->headerComponent != header) { if (d->header) { + if (scene()) + scene()->removeItem(d->header->item); + d->header->item->deleteLater(); delete d->header; d->header = 0; } @@ -1816,6 +1828,7 @@ void QDeclarativeGridView::setHeader(QDeclarativeComponent *header) d->updateHeader(); d->updateFooter(); d->updateGrid(); + d->fixupPosition(); } emit headerChanged(); } @@ -2122,6 +2135,78 @@ void QDeclarativeGridView::moveCurrentIndexRight() } } +void QDeclarativeGridViewPrivate::positionViewAtIndex(int index, int mode) +{ + Q_Q(QDeclarativeGridView); + if (!isValid()) + return; + if (mode < QDeclarativeGridView::Beginning || mode > QDeclarativeGridView::Contain) + return; + + int idx = qMax(qMin(index, model->count()-1), 0); + + if (layoutScheduled) + layout(); + qreal pos = position(); + FxGridItem *item = visibleItem(idx); + qreal maxExtent = flow == QDeclarativeGridView::LeftToRight ? -q->maxYExtent() : -q->maxXExtent(); + if (!item) { + int itemPos = rowPosAt(idx); + // save the currently visible items in case any of them end up visible again + QList<FxGridItem*> oldVisible = visibleItems; + visibleItems.clear(); + visibleIndex = idx - idx % columns; + maxExtent = flow == QDeclarativeGridView::LeftToRight ? -q->maxYExtent() : -q->maxXExtent(); + setPosition(qMin(qreal(itemPos), maxExtent)); + // now release the reference to all the old visible items. + for (int i = 0; i < oldVisible.count(); ++i) + releaseItem(oldVisible.at(i)); + item = visibleItem(idx); + } + if (item) { + qreal itemPos = item->rowPos(); + switch (mode) { + case QDeclarativeGridView::Beginning: + pos = itemPos; + if (index < 0 && header) { + pos -= flow == QDeclarativeGridView::LeftToRight + ? header->item->height() + : header->item->width(); + } + break; + case QDeclarativeGridView::Center: + pos = itemPos - (size() - rowSize())/2; + break; + case QDeclarativeGridView::End: + pos = itemPos - size() + rowSize(); + if (index >= model->count() && footer) { + pos += flow == QDeclarativeGridView::LeftToRight + ? footer->item->height() + : footer->item->width(); + } + break; + case QDeclarativeGridView::Visible: + if (itemPos > pos + size()) + pos = itemPos - size() + rowSize(); + else if (item->endRowPos() < pos) + pos = itemPos; + break; + case QDeclarativeGridView::Contain: + if (item->endRowPos() > pos + size()) + pos = itemPos - size() + rowSize(); + if (itemPos < pos) + pos = itemPos; + } + pos = qMin(pos, maxExtent); + qreal minExtent = flow == QDeclarativeGridView::LeftToRight ? -q->minYExtent() : -q->minXExtent(); + pos = qMax(pos, minExtent); + moveReason = QDeclarativeGridViewPrivate::Other; + q->cancelFlick(); + setPosition(pos); + } + fixupPosition(); +} + /*! \qmlmethod GridView::positionViewAtIndex(int index, PositionMode mode) @@ -2159,58 +2244,42 @@ void QDeclarativeGridView::positionViewAtIndex(int index, int mode) Q_D(QDeclarativeGridView); if (!d->isValid() || index < 0 || index >= d->model->count()) return; - if (mode < Beginning || mode > Contain) + d->positionViewAtIndex(index, mode); +} + +/*! + \qmlmethod GridView::positionViewAtBeginning() + \qmlmethod 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 +*/ +void QDeclarativeGridView::positionViewAtBeginning() +{ + Q_D(QDeclarativeGridView); + if (!d->isValid()) return; + d->positionViewAtIndex(-1, Beginning); +} - if (d->layoutScheduled) - d->layout(); - qreal pos = d->position(); - qreal maxExtent = d->flow == QDeclarativeGridView::LeftToRight ? -maxYExtent() : -maxXExtent(); - FxGridItem *item = d->visibleItem(index); - if (!item) { - int itemPos = 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(qMin(qreal(itemPos), maxExtent)); - // now release the reference to all the old visible items. - for (int i = 0; i < oldVisible.count(); ++i) - d->releaseItem(oldVisible.at(i)); - item = d->visibleItem(index); - } - if (item) { - qreal itemPos = item->rowPos(); - switch (mode) { - case Beginning: - pos = itemPos; - break; - case Center: - pos = itemPos - (d->size() - d->rowSize())/2; - break; - case End: - pos = itemPos - d->size() + d->rowSize(); - break; - case Visible: - if (itemPos > pos + d->size()) - pos = itemPos - d->size() + d->rowSize(); - else if (item->endRowPos() < pos) - pos = itemPos; - break; - case Contain: - if (item->endRowPos() > pos + d->size()) - pos = itemPos - d->size() + d->rowSize(); - if (itemPos < pos) - pos = itemPos; - } - pos = qMin(pos, maxExtent); - qreal minExtent = d->flow == QDeclarativeGridView::LeftToRight ? -minYExtent() : -minXExtent(); - pos = qMax(pos, minExtent); - d->moveReason = QDeclarativeGridViewPrivate::Other; - cancelFlick(); - d->setPosition(pos); - } - d->fixupPosition(); +void QDeclarativeGridView::positionViewAtEnd() +{ + Q_D(QDeclarativeGridView); + if (!d->isValid()) + return; + d->positionViewAtIndex(d->model->count(), End); } /*! @@ -2321,24 +2390,9 @@ void QDeclarativeGridView::itemsInserted(int modelIndex, int count) Q_D(QDeclarativeGridView); if (!isComponentComplete()) return; - if (!d->visibleItems.count() || d->model->count() <= 1) { - d->scheduleLayout(); - if (d->itemCount && d->currentIndex >= modelIndex) { - // adjust current item index - d->currentIndex += count; - if (d->currentItem) - d->currentItem->index = d->currentIndex; - emit currentIndexChanged(); - } else if (!d->currentIndex || (d->currentIndex < 0 && !d->currentIndexCleared)) { - d->updateCurrent(0); - } - d->itemCount += count; - emit countChanged(); - return; - } - int index = d->mapFromModel(modelIndex); - if (index == -1) { + int index = d->visibleItems.count() ? d->mapFromModel(modelIndex) : 0; + if (index < 0) { int i = d->visibleItems.count() - 1; while (i > 0 && d->visibleItems.at(i)->index == -1) --i; @@ -2369,28 +2423,35 @@ void QDeclarativeGridView::itemsInserted(int modelIndex, int count) } } - // At least some of the added items will be visible int insertCount = count; - if (index < d->visibleIndex) { + if (index < d->visibleIndex && d->visibleItems.count()) { 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(); + int colPos = 0; + int rowPos = 0; + if (d->visibleItems.count()) { + index -= d->visibleIndex; + 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(); + } } + } else if (d->itemCount == 0 && d->header) { + if (d->flow == QDeclarativeGridView::LeftToRight) + rowPos = d->headerSize(); + else + colPos = d->headerSize(); } // Update the indexes of the following visible items. @@ -2443,6 +2504,8 @@ void QDeclarativeGridView::itemsInserted(int modelIndex, int count) if (d->currentItem) { d->currentItem->index = d->currentIndex; d->currentItem->setPosition(d->colPosAt(d->currentIndex), d->rowPosAt(d->currentIndex)); + } else if (!d->currentIndex || (d->currentIndex < 0 && !d->currentIndexCleared)) { + d->updateCurrent(0); } emit currentIndexChanged(); } @@ -2560,12 +2623,8 @@ void QDeclarativeGridView::itemsMoved(int from, int to, int count) return; 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; @@ -2574,16 +2633,12 @@ void QDeclarativeGridView::itemsMoved(int from, int to, int count) 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; } |