本文整理汇总了C++中ListItem::child方法的典型用法代码示例。如果您正苦于以下问题：C++ ListItem::child方法的具体用法？C++ ListItem::child怎么用？C++ ListItem::child使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ListItem的用法示例。
在下文中一共展示了ListItem::child方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: moveItemVertical
QModelIndex ListModel::moveItemVertical(const QModelIndex& index, App::Direction direction)
{
ListItem* item = itemFromIndex(index);
if (!item)
return index;
int row = item->row();
if (direction == App::Up && row == 0)
return index;
ListItem* parent = item->parent();
if (direction == App::Down && row == (parent->childCount() - 1))
return index;
ListItem* otherItem = parent->child(direction == App::Up ? row - 1 : row + 1);
int downRow = direction == App::Down ? row : row - 1; // the row that is being moved down
QSqlDatabase db = QSqlDatabase::database();
db.transaction();
if (item->setRow(direction == App::Down ? row + 1 : row - 1) &&
otherItem->setRow(row)) {
db.commit();
if (beginMoveRows(index.parent(), downRow, downRow, index.parent(), downRow + 2)) {
parent->moveChild(downRow);
endMoveRows();
return indexFromItem(item);
}
} else
db.rollback();
return index;
}示例2: moveItemHorizontal
QModelIndex ListModel::moveItemHorizontal(const QModelIndex& index, int direction)
{
ListItem* item = itemFromIndex(index);
if (!item)
return index;
ListItem* parent = item->parent();
int row = item->row();
if (direction == App::Left) { // reparent as child of parent's parent
if (!parent || parent->isRoot()) // already top level item
return index;
ListItem* newParent = parent->parent();
int newRow = parent->row() + 1;
QSqlDatabase db = QSqlDatabase::database();
db.transaction();
if (parent->takeChildDb(row) &&
item->setParentDb(newParent, newRow)) {
db.commit();
if (beginMoveRows(indexFromItem(parent), row, row, indexFromItem(newParent), newRow)) {
newParent->insertChild(newRow, parent->takeChild(row));
endMoveRows();
}
return indexFromItem(item);
} else {
db.rollback();
return index;
}
} else { // move as child of previous sibling
ListItem* newParent = parent->child(row - 1);
if (!newParent)
return index;
QSqlDatabase db = QSqlDatabase::database();
db.transaction();
if (parent->takeChildDb(row) &&
item->setParentDb(newParent, newParent->childCount())) {
db.commit();
if (beginMoveRows(indexFromItem(parent), row, row, indexFromItem(newParent), newParent->childCount())) {
newParent->appendChild(parent->takeChild(row));
endMoveRows();
}
newParent->setExpanded(true);
return indexFromItem(item);
} else {
db.rollback();
return index;
}
}
}示例3: index
QModelIndex ListModel::index(int row, int column, const QModelIndex& parent) const
{
if (row < 0 || column < 0)
return QModelIndex();
ListItem* parentItem = itemFromIndex(parent);
if (!parentItem || row >= parentItem->childCount())
return QModelIndex();
ListItem* childItem = parentItem->child(row);
if (!childItem)
return QModelIndex();
return createIndex(row, column, childItem);
}示例4: index
QModelIndex TagMngrListModel::index(int row, int column, const QModelIndex& parent)
const
{
if (!hasIndex(row, column, parent))
return QModelIndex();
ListItem* parentItem = 0;
if (!parent.isValid())
parentItem = d->rootItem;
else
parentItem = static_cast<ListItem*>(parent.internalPointer());
ListItem* const childItem = parentItem->child(row);
if (childItem)
return createIndex(row, column, childItem);
else
return QModelIndex();
}