我正在使用 QSortFilterProxyModel 来过滤来自 QAbstractListModel 的结果。但是,我想返回原始模型中不存在的第一个条目,也就是说,它在某种程度上是人为的。
这是我目前所拥有的:
class ActivedAccountModel(QSortFilterProxyModel):
def __init__(self, model, parent=None):
super(ActiveAccountModel, self).__init__(parent)
self.setSourceModel(model)
self.setDynamicSortFilter(True)
def data(self, index, role=Qt.DisplayRole):
account_info = super(ActiveAccountModel, self).data(index, Qt.UserRole).toPyObject()
if role == Qt.DisplayRole:
return account_info.name
elif role == Qt.UserRole:
return account_info
return None
def filterAcceptsRow(self, source_row, source_parent):
source_model = self.sourceModel()
source_index = source_model.index(source_row, 0, source_parent)
account_info = source_model.data(source_index, Qt.UserRole)
return isinstance(account_info.account, Account) and account_info.account.enabled
这将返回以下形式的列表:
Account 1
Account 2
...
我想在返回的列表 f 元素的开头返回一个额外的元素:
Extra Element
Account 1
Account 2
...
我试图重新实现 rowCount 以返回真正的 rowCount()+1,但不知何故我需要移动所有项目以返回索引 0 处的这个人工元素,并且我有点迷路了。
有什么线索吗?到目前为止我找不到任何相关的代码示例...谢谢!
最佳答案
因为我在这个实现上遇到了一些困难,而且我在整个网络中找不到任何其他示例代码,所以我发布了这个示例实现。
我希望这对其他人也有帮助...
/**
** Written by Sven Anders (ANDURAS AG). Public domain code.
**/
#include <QDebug>
#include <QBrush>
#include <QFont>
#include <QSortFilterProxyModel>
/** Definition **/
class ProxyModelNoneEntry : public QSortFilterProxyModel
{
Q_OBJECT
public:
ProxyModelNoneEntry(QString _entry_text = tr("(None)"), QObject *parent=0);
int rowCount(const QModelIndex &parent = QModelIndex()) const;
/* lessThan() is not necessary for this model to work, but can be
implemented in a derived class if a custom sorting method is required. */
// bool lessThan(const QModelIndex &left, const QModelIndex &right) const;
QModelIndex mapFromSource(const QModelIndex &sourceIndex) const;
QModelIndex mapToSource(const QModelIndex &proxyIndex) const;
QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
Qt::ItemFlags flags(const QModelIndex &index) const;
QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
QModelIndex parent(const QModelIndex &child) const;
private:
QString entry_text;
};
/** Implementation **/
ProxyModelNoneEntry::ProxyModelNoneEntry(QString _entry_text, QObject *parent) : QSortFilterProxyModel(parent)
{
entry_text = _entry_text;
}
int ProxyModelNoneEntry::rowCount(const QModelIndex &parent) const
{
Q_UNUSED(parent)
return QSortFilterProxyModel::rowCount()+1;
}
QModelIndex ProxyModelNoneEntry::mapFromSource(const QModelIndex &sourceIndex) const
{
if (!sourceIndex.isValid()) return QModelIndex();
else if (sourceIndex.parent().isValid()) return QModelIndex();
return createIndex(sourceIndex.row()+1, sourceIndex.column());
}
QModelIndex ProxyModelNoneEntry::mapToSource(const QModelIndex &proxyIndex) const
{
if (!proxyIndex.isValid()) return QModelIndex();
else if (proxyIndex.row() == 0) return QModelIndex();
return sourceModel()->index(proxyIndex.row()-1, proxyIndex.column());
}
QVariant ProxyModelNoneEntry::data(const QModelIndex &index, int role) const
{
if (!index.isValid()) return QVariant();
if (index.row() == 0)
{
if (role == Qt::DisplayRole)
return entry_text;
else if (role == Qt::DecorationRole)
return QVariant();
else if (role == Qt::FontRole)
{ QFont font; font.setItalic(true); return font; }
else
return QVariant();
}
return QSortFilterProxyModel::data(createIndex(index.row(),index.column()), role);
}
Qt::ItemFlags ProxyModelNoneEntry::flags(const QModelIndex &index) const
{
if (!index.isValid()) return Qt::NoItemFlags;
if (index.row() == 0) return Qt::ItemIsSelectable | Qt::ItemIsEnabled;
return QSortFilterProxyModel::flags(createIndex(index.row(),index.column()));
}
QModelIndex ProxyModelNoneEntry::index(int row, int column, const QModelIndex &parent) const
{
if (row > rowCount()) return QModelIndex();
return createIndex(row, column);
}
QModelIndex ProxyModelNoneEntry::parent(const QModelIndex &child) const
{
Q_UNUSED(child)
return QModelIndex();
}
问候 斯文
关于python - QSortFilterProxyModel 返回人工行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3730117/