26 #include "horizontaljournal.h" 28 #include <qqmlengine.h> 30 #include <private/qqmldelegatemodel_p.h> 31 #include <private/qquickitem_p.h> 33 HorizontalJournal::HorizontalJournal()
34 : m_firstVisibleIndex(-1)
39 qreal HorizontalJournal::rowHeight()
const 44 void HorizontalJournal::setRowHeight(qreal rowHeight)
46 if (rowHeight != m_rowHeight) {
47 m_rowHeight = rowHeight;
48 Q_EMIT rowHeightChanged();
50 if (isComponentComplete()) {
51 Q_FOREACH(QQuickItem *item, m_visibleItems) {
52 item->setHeight(rowHeight);
59 void HorizontalJournal::findBottomModelIndexToAdd(
int *modelIndex, qreal *yPos)
61 if (m_visibleItems.isEmpty()) {
65 *modelIndex = m_firstVisibleIndex + m_visibleItems.count();
66 if (m_lastInRowIndexPosition.contains(*modelIndex - 1)) {
67 *yPos = m_visibleItems.last()->y() + m_rowHeight + rowSpacing();
69 *yPos = m_visibleItems.last()->y();
74 void HorizontalJournal::findTopModelIndexToAdd(
int *modelIndex, qreal *yPos)
76 if (m_visibleItems.isEmpty()) {
80 *modelIndex = m_firstVisibleIndex - 1;
81 if (m_lastInRowIndexPosition.contains(*modelIndex)) {
82 *yPos = m_visibleItems.first()->y() - rowSpacing() - m_rowHeight;
84 *yPos = m_visibleItems.first()->y();
89 bool HorizontalJournal::removeNonVisibleItems(qreal bufferFromY, qreal bufferToY)
93 while (!m_visibleItems.isEmpty() && m_visibleItems.first()->y() + m_rowHeight < bufferFromY) {
94 releaseItem(m_visibleItems.takeFirst());
96 m_firstVisibleIndex++;
99 while (!m_visibleItems.isEmpty() && m_visibleItems.last()->y() > bufferToY) {
100 releaseItem(m_visibleItems.takeLast());
102 m_lastInRowIndexPosition.remove(m_firstVisibleIndex + m_visibleItems.count());
105 if (m_visibleItems.isEmpty()) {
106 m_firstVisibleIndex = -1;
112 void HorizontalJournal::addItemToView(
int modelIndex, QQuickItem *item)
114 if (item->height() != m_rowHeight) {
115 qWarning() <<
"Item" << modelIndex <<
"height is not the one that the rowHeight mandates, resetting it";
116 item->setHeight(m_rowHeight);
119 if (m_visibleItems.isEmpty()) {
120 Q_ASSERT(modelIndex == 0);
123 m_visibleItems << item;
124 m_firstVisibleIndex = 0;
127 if (modelIndex == m_firstVisibleIndex + m_visibleItems.count()) {
128 QQuickItem *lastItem = m_visibleItems.last();
129 if (lastItem->x() + lastItem->width() + columnSpacing() + item->width() <= width()) {
131 item->setY(lastItem->y());
132 item->setX(lastItem->x() + lastItem->width() + columnSpacing());
135 item->setY(lastItem->y() + m_rowHeight + rowSpacing());
137 m_lastInRowIndexPosition[modelIndex - 1] = lastItem->x();
139 m_visibleItems << item;
140 }
else if (modelIndex == m_firstVisibleIndex - 1) {
141 QQuickItem *firstItem = m_visibleItems.first();
142 if (m_lastInRowIndexPosition.contains(modelIndex)) {
144 item->setY(firstItem->y() - rowSpacing() - m_rowHeight);
145 item->setX(m_lastInRowIndexPosition[modelIndex]);
147 item->setY(firstItem->y());
148 item->setX(firstItem->x() - columnSpacing() - item->width());
150 m_firstVisibleIndex = modelIndex;
151 m_visibleItems.prepend(item);
153 qWarning() <<
"HorizontalJournal::addItemToView - Got unexpected modelIndex" 154 << modelIndex << m_firstVisibleIndex << m_visibleItems.count();
159 void HorizontalJournal::cleanupExistingItems()
162 Q_FOREACH(QQuickItem *item, m_visibleItems)
164 m_visibleItems.clear();
165 m_lastInRowIndexPosition.clear();
166 m_firstVisibleIndex = -1;
167 setImplicitHeightDirty();
172 if (m_firstVisibleIndex >= 0) {
173 const int nIndexes = m_firstVisibleIndex + m_visibleItems.count();
174 const double bottomMostY = m_visibleItems.last()->y() + m_rowHeight;
175 const double averageHeight = bottomMostY / nIndexes;
176 setImplicitHeight(bottomMostY + averageHeight * (model()->rowCount() - nIndexes));
178 setImplicitHeight(0);
182 void HorizontalJournal::processModelRemoves(
const QVector<QQmlChangeSet::Change> &removes)
184 Q_FOREACH(
const QQmlChangeSet::Change
remove, removes) {
185 for (
int i =
remove.count - 1; i >= 0; --i) {
186 const int indexToRemove =
remove.index + i;
189 const int lastIndex = m_firstVisibleIndex + m_visibleItems.count() - 1;
190 if (indexToRemove == lastIndex) {
191 releaseItem(m_visibleItems.takeLast());
192 m_lastInRowIndexPosition.remove(indexToRemove);
194 if (indexToRemove < lastIndex) {
195 qDebug() <<
"HorizontalJournal only supports removal from the end of the model, resetting instead";
196 cleanupExistingItems();
199 setImplicitHeightDirty();
204 if (m_visibleItems.isEmpty()) {
205 m_firstVisibleIndex = -1;
210 void HorizontalJournal::doRelayout()
215 if (m_firstVisibleIndex == 0) {
217 const QList<QQuickItem*> allItems = m_visibleItems;
218 m_visibleItems.clear();
219 m_lastInRowIndexPosition.clear();
220 Q_FOREACH(QQuickItem *item, allItems) {
221 addItemToView(i, item);
225 Q_FOREACH(QQuickItem *item, m_visibleItems) {
228 m_visibleItems.clear();
229 m_lastInRowIndexPosition.clear();
230 m_firstVisibleIndex = -1;
234 void HorizontalJournal::updateItemCulling(qreal visibleFromY, qreal visibleToY)
236 Q_FOREACH(QQuickItem *item, m_visibleItems) {
237 QQuickItemPrivate::get(item)->setCulled(item->y() + m_rowHeight <= visibleFromY || item->y() >= visibleToY);