28 #include "verticaljournal.h"
30 #pragma GCC diagnostic push
31 #pragma GCC diagnostic ignored "-pedantic"
32 #include <private/qquickitem_p.h>
33 #pragma GCC diagnostic pop
35 VerticalJournal::VerticalJournal()
40 qreal VerticalJournal::columnWidth()
const
45 void VerticalJournal::setColumnWidth(qreal columnWidth)
47 if (columnWidth != m_columnWidth) {
48 m_columnWidth = columnWidth;
49 Q_EMIT columnWidthChanged();
51 if (isComponentComplete()) {
52 Q_FOREACH(
const auto &column, m_columnVisibleItems) {
53 Q_FOREACH(
const ViewItem &item, column) {
54 item.m_item->setWidth(columnWidth);
62 void VerticalJournal::findBottomModelIndexToAdd(
int *modelIndex, qreal *yPos)
65 *yPos = std::numeric_limits<qreal>::max();
67 Q_FOREACH(
const auto &column, m_columnVisibleItems) {
68 if (!column.isEmpty()) {
69 const ViewItem &item = column.last();
70 *yPos = qMin(*yPos, item.y() + item.height() + rowSpacing());
71 *modelIndex = qMax(*modelIndex, item.m_modelIndex + 1);
78 void VerticalJournal::findTopModelIndexToAdd(
int *modelIndex, qreal *yPos)
81 *yPos = std::numeric_limits<qreal>::lowest();
82 int columnToAddTo = -1;
85 for (
int i = 0; i < m_columnVisibleItems.count(); ++i) {
86 const auto &column = m_columnVisibleItems[i];
87 if (!column.isEmpty()) {
88 const ViewItem &item = column.first();
89 const auto itemTopPos = item.y() - rowSpacing();
90 if (itemTopPos > *yPos) {
92 *modelIndex = item.m_modelIndex - 1;
98 if (*modelIndex > 0) {
99 Q_ASSERT(m_indexColumnMap.contains(*modelIndex));
100 while (m_indexColumnMap[*modelIndex] != columnToAddTo) {
105 *modelIndex = *modelIndex - 1;
106 Q_ASSERT(m_indexColumnMap.contains(*modelIndex));
111 bool VerticalJournal::removeNonVisibleItems(qreal bufferFromY, qreal bufferToY)
113 bool changed =
false;
115 for (
int i = 0; i < m_columnVisibleItems.count(); ++i) {
116 QList<ViewItem> &column = m_columnVisibleItems[i];
117 while (!column.isEmpty() && column.first().y() + column.first().height() < bufferFromY) {
118 releaseItem(column.takeFirst().m_item);
122 while (!column.isEmpty() && column.last().y() > bufferToY) {
123 releaseItem(column.takeLast().m_item);
131 void VerticalJournal::addItemToView(
int modelIndex, QQuickItem *item)
133 if (item->width() != m_columnWidth) {
134 qWarning() <<
"Item" << modelIndex <<
"width is not the one that the columnWidth mandates, resetting it";
135 item->setWidth(m_columnWidth);
139 const QList<ViewItem> &firstColumn = m_columnVisibleItems[0];
140 qreal columnToAddY = !firstColumn.isEmpty() ? firstColumn.last().y() + firstColumn.last().height() : -rowSpacing();
141 int columnToAddTo = 0;
142 for (
int i = 1; i < m_columnVisibleItems.count(); ++i) {
143 const QList<ViewItem> &column = m_columnVisibleItems[i];
144 const qreal iY = !column.isEmpty() ? column.last().y() + column.last().height() : -rowSpacing();
145 if (iY < columnToAddY) {
151 const QList<ViewItem> &columnToAdd = m_columnVisibleItems[columnToAddTo];
152 if (columnToAdd.isEmpty() || columnToAdd.last().m_modelIndex < modelIndex) {
153 item->setX(columnToAddTo * (m_columnWidth + columnSpacing()));
154 item->setY(columnToAddY + rowSpacing());
156 m_columnVisibleItems[columnToAddTo] << ViewItem(item, modelIndex);
157 m_indexColumnMap[modelIndex] = columnToAddTo;
159 Q_ASSERT(m_indexColumnMap.contains(modelIndex));
160 columnToAddTo = m_indexColumnMap[modelIndex];
161 columnToAddY = m_columnVisibleItems[columnToAddTo].first().y();
163 item->setX(columnToAddTo * (m_columnWidth + columnSpacing()));
164 item->setY(columnToAddY - rowSpacing() - item->height());
166 m_columnVisibleItems[columnToAddTo].prepend(ViewItem(item, modelIndex));
170 void VerticalJournal::cleanupExistingItems()
173 for (
int i = 0; i < m_columnVisibleItems.count(); ++i) {
174 QList<ViewItem> &column = m_columnVisibleItems[i];
175 Q_FOREACH(
const ViewItem &item, column)
176 releaseItem(item.m_item);
179 m_indexColumnMap.clear();
180 setImplicitHeightDirty();
185 int lastModelIndex = -1;
186 qreal bottomMostY = 0;
187 Q_FOREACH(
const auto &column, m_columnVisibleItems) {
188 if (!column.isEmpty()) {
189 const ViewItem &item = column.last();
190 lastModelIndex = qMax(lastModelIndex, item.m_modelIndex);
191 bottomMostY = qMax(bottomMostY, item.y() + item.height());
194 if (lastModelIndex >= 0) {
195 const double averageHeight = bottomMostY / (lastModelIndex + 1);
196 setImplicitHeight(bottomMostY + averageHeight * (model()->rowCount() - lastModelIndex - 1));
198 setImplicitHeight(0);
202 void VerticalJournal::doRelayout()
204 QList<ViewItem> allItems;
205 Q_FOREACH(
const auto &column, m_columnVisibleItems)
210 const
int nColumns = qMax(1., floor((
double)(width() + columnSpacing()) / (m_columnWidth + columnSpacing())));
211 m_columnVisibleItems.resize(nColumns);
212 m_indexColumnMap.clear();
213 for (
int i = 0; i < nColumns; ++i)
214 m_columnVisibleItems[i].clear();
219 if (!allItems.isEmpty()) {
220 if (allItems.first().m_modelIndex == 0) {
221 Q_FOREACH(
const ViewItem &item, allItems)
222 addItemToView(item.m_modelIndex, item.m_item);
224 Q_FOREACH(
const ViewItem &item, allItems)
225 releaseItem(item.m_item);
230 void VerticalJournal::updateItemCulling(qreal visibleFromY, qreal visibleToY)
232 Q_FOREACH(
const auto &column, m_columnVisibleItems) {
233 Q_FOREACH(
const ViewItem &item, column) {
234 const bool cull = item.y() + item.height() <= visibleFromY || item.y() >= visibleToY;
235 QQuickItemPrivate::get(item.m_item)->setCulled(cull);
240 void VerticalJournal::processModelRemoves(
const QVector<QQmlChangeSet::Change> &removes)
242 Q_FOREACH(
const QQmlChangeSet::Change &
remove, removes) {
243 for (
int i =
remove.count - 1; i >= 0; --i) {
244 const int indexToRemove =
remove.index + i;
250 int lastCreatedIndex = INT_MIN;
251 for (
int i = 0; !found && i < m_columnVisibleItems.count(); ++i) {
252 QList<ViewItem> &column = m_columnVisibleItems[i];
253 if (!column.isEmpty()) {
254 const int lastColumnIndex = column.last().m_modelIndex;
255 if (lastColumnIndex == indexToRemove) {
256 releaseItem(column.takeLast().m_item);
259 lastCreatedIndex = qMax(lastCreatedIndex, lastColumnIndex);
263 if (indexToRemove < lastCreatedIndex) {
264 qFatal(
"VerticalJournal only supports removal from the end of the model");
266 setImplicitHeightDirty();