26 #include "horizontaljournal.h"
28 #include <qqmlengine.h>
29 #pragma GCC diagnostic push
30 #pragma GCC diagnostic ignored "-pedantic"
31 #include <private/qqmldelegatemodel_p.h>
33 #include <private/qquickitem_p.h>
34 #pragma GCC diagnostic pop
36 HorizontalJournal::HorizontalJournal()
37 : m_firstVisibleIndex(-1)
42 qreal HorizontalJournal::rowHeight()
const
47 void HorizontalJournal::setRowHeight(qreal rowHeight)
49 if (rowHeight != m_rowHeight) {
50 m_rowHeight = rowHeight;
51 Q_EMIT rowHeightChanged();
53 if (isComponentComplete()) {
54 Q_FOREACH(QQuickItem *item, m_visibleItems) {
55 item->setHeight(rowHeight);
62 void HorizontalJournal::findBottomModelIndexToAdd(
int *modelIndex, qreal *yPos)
64 if (m_visibleItems.isEmpty()) {
68 *modelIndex = m_firstVisibleIndex + m_visibleItems.count();
69 if (m_lastInRowIndexPosition.contains(*modelIndex - 1)) {
70 *yPos = m_visibleItems.last()->y() + m_rowHeight + rowSpacing();
72 *yPos = m_visibleItems.last()->y();
77 void HorizontalJournal::findTopModelIndexToAdd(
int *modelIndex, qreal *yPos)
79 if (m_visibleItems.isEmpty()) {
83 *modelIndex = m_firstVisibleIndex - 1;
84 if (m_lastInRowIndexPosition.contains(*modelIndex)) {
85 *yPos = m_visibleItems.first()->y() - rowSpacing() - m_rowHeight;
87 *yPos = m_visibleItems.first()->y();
92 bool HorizontalJournal::removeNonVisibleItems(qreal bufferFromY, qreal bufferToY)
96 while (!m_visibleItems.isEmpty() && m_visibleItems.first()->y() + m_rowHeight < bufferFromY) {
97 releaseItem(m_visibleItems.takeFirst());
99 m_firstVisibleIndex++;
102 while (!m_visibleItems.isEmpty() && m_visibleItems.last()->y() > bufferToY) {
103 releaseItem(m_visibleItems.takeLast());
105 m_lastInRowIndexPosition.remove(m_firstVisibleIndex + m_visibleItems.count());
108 if (m_visibleItems.isEmpty()) {
109 m_firstVisibleIndex = -1;
115 void HorizontalJournal::addItemToView(
int modelIndex, QQuickItem *item)
117 if (item->height() != m_rowHeight) {
118 qWarning() <<
"Item" << modelIndex <<
"height is not the one that the rowHeight mandates, resetting it";
119 item->setHeight(m_rowHeight);
122 if (m_visibleItems.isEmpty()) {
123 Q_ASSERT(modelIndex == 0);
126 m_visibleItems << item;
127 m_firstVisibleIndex = 0;
130 if (modelIndex == m_firstVisibleIndex + m_visibleItems.count()) {
131 QQuickItem *lastItem = m_visibleItems.last();
132 if (lastItem->x() + lastItem->width() + columnSpacing() + item->width() <= width()) {
134 item->setY(lastItem->y());
135 item->setX(lastItem->x() + lastItem->width() + columnSpacing());
138 item->setY(lastItem->y() + m_rowHeight + rowSpacing());
140 m_lastInRowIndexPosition[modelIndex - 1] = lastItem->x();
142 m_visibleItems << item;
143 }
else if (modelIndex == m_firstVisibleIndex - 1) {
144 QQuickItem *firstItem = m_visibleItems.first();
145 if (m_lastInRowIndexPosition.contains(modelIndex)) {
147 item->setY(firstItem->y() - rowSpacing() - m_rowHeight);
148 item->setX(m_lastInRowIndexPosition[modelIndex]);
150 item->setY(firstItem->y());
151 item->setX(firstItem->x() - columnSpacing() - item->width());
153 m_firstVisibleIndex = modelIndex;
154 m_visibleItems.prepend(item);
156 qWarning() <<
"HorizontalJournal::addItemToView - Got unexpected modelIndex"
157 << modelIndex << m_firstVisibleIndex << m_visibleItems.count();
162 void HorizontalJournal::cleanupExistingItems()
165 Q_FOREACH(QQuickItem *item, m_visibleItems)
167 m_visibleItems.clear();
168 m_lastInRowIndexPosition.clear();
169 m_firstVisibleIndex = -1;
170 setImplicitHeightDirty();
175 if (m_firstVisibleIndex >= 0) {
176 const int nIndexes = m_firstVisibleIndex + m_visibleItems.count();
177 const double bottomMostY = m_visibleItems.last()->y() + m_rowHeight;
178 const double averageHeight = bottomMostY / nIndexes;
179 setImplicitHeight(bottomMostY + averageHeight * (model()->rowCount() - nIndexes));
181 setImplicitHeight(0);
185 void HorizontalJournal::processModelRemoves(
const QVector<QQmlChangeSet::Change> &removes)
187 Q_FOREACH(
const QQmlChangeSet::Change &
remove, removes) {
188 for (
int i =
remove.count - 1; i >= 0; --i) {
189 const int indexToRemove =
remove.index + i;
192 const int lastIndex = m_firstVisibleIndex + m_visibleItems.count() - 1;
193 if (indexToRemove == lastIndex) {
194 releaseItem(m_visibleItems.takeLast());
195 m_lastInRowIndexPosition.remove(indexToRemove);
197 if (indexToRemove < lastIndex) {
198 qFatal(
"HorizontalJournal only supports removal from the end of the model");
200 setImplicitHeightDirty();
205 if (m_visibleItems.isEmpty()) {
206 m_firstVisibleIndex = -1;
211 void HorizontalJournal::doRelayout()
216 if (m_firstVisibleIndex == 0) {
218 const QList<QQuickItem*> allItems = m_visibleItems;
219 m_visibleItems.clear();
220 m_lastInRowIndexPosition.clear();
221 Q_FOREACH(QQuickItem *item, allItems) {
222 addItemToView(i, item);
226 Q_FOREACH(QQuickItem *item, m_visibleItems) {
229 m_visibleItems.clear();
230 m_lastInRowIndexPosition.clear();
231 m_firstVisibleIndex = -1;
235 void HorizontalJournal::updateItemCulling(qreal visibleFromY, qreal visibleToY)
237 Q_FOREACH(QQuickItem *item, m_visibleItems) {
238 QQuickItemPrivate::get(item)->setCulled(item->y() + m_rowHeight <= visibleFromY || item->y() >= visibleToY);