QIdentityProxyModel 类

The QIdentityProxyModel class proxies its source model unmodified. 更多...

头文件 #include <QIdentityProxyModel>
CMakefind_package(Qt6 REQUIRED COMPONENTS Core)
target_link_libraries(mytarget PRIVATE Qt6::Core)
qmakeQT += core
继承 QAbstractProxyModel

公共函数

QIdentityProxyModel(QObject *parent = nullptr)
虚函数~QIdentityProxyModel()

重新 implemented 公共函数

虚函数 intcolumnCount(const QModelIndex &parent = QModelIndex()) const override
虚拟 booldropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) override
虚拟 QVariantheaderData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override
虚拟 QModelIndexindex(int row, int column, const QModelIndex &parent = QModelIndex()) const override
虚拟 boolinsertColumns(int column, int count, const QModelIndex &parent = QModelIndex()) override
虚拟 boolinsertRows(int row, int count, const QModelIndex &parent = QModelIndex()) override
虚拟 QModelIndexmapFromSource(const QModelIndex &sourceIndex) const override
虚拟 QItemSelectionmapSelectionFromSource(const QItemSelection &selection) const override
虚拟 QItemSelectionmapSelectionToSource(const QItemSelection &selection) const override
虚拟 QModelIndexmapToSource(const QModelIndex &proxyIndex) const override
虚拟 QModelIndexListmatch(const QModelIndex &start, int role, const QVariant &value, int hits = 1, Qt::MatchFlags flags = Qt::MatchFlags(Qt::MatchStartsWith|Qt::MatchWrap)) const override
虚拟 boolmoveColumns(const QModelIndex &sourceParent, int sourceColumn, int count, const QModelIndex &.destinationParent, int destinationChild) override
虚拟 boolmoveRows(const QModelIndex &sourceParent, int sourceRow, int count, const QModelIndex &.destinationParent, int destinationChild) override
虚拟 QModelIndexparent(const QModelIndex &child) const override
虚拟 boolremoveColumns(int column, int count, const QModelIndex &.parent = QModelIndex()) override
虚拟 boolremoveRows(int row, int count, const QModelIndex &.parent = QModelIndex()) override
虚函数 introwCount(const QModelIndex &parent = QModelIndex()) const override
虚拟函数 voidsetSourceModel(QAbstractItemModel *newSourceModel) override
虚拟 QModelIndexsibling(int row, int column, const QModelIndex &idx) const override

详细描述

QIdentityProxyModel 可以精确地转发源模型的结构，没有任何排序、筛选或其他转换。这在概念上类似于单位矩阵，其中 A.I = A。

因为它不进行排序或筛选，这个类最适合于转换源模型的数据的代理模型。例如，可以创建一个代理模型来定义字体、背景颜色或工具提示等。这样就不需要在创建模型结构的同一类中实现所有数据处理，还可以用来创建可重用组件。

这还提供了一种在源模型由无法修改的第三方提供的情况下更改数据的方法。

class DateFormatProxyModel : public QIdentityProxyModel
{
  // ...

  void setDateFormatString(const QString &formatString)
  {
    m_formatString = formatString;
  }

  QVariant data(const QModelIndex &index, int role) const override
  {
    if (role != Qt::DisplayRole)
      return QIdentityProxyModel::data(index, role);

    const QDateTime dateTime = sourceModel()->data(SourceClass::DateRole).toDateTime();
    return dateTime.toString(m_formatString);
  }

  QMap<int, QVariant> itemData(const QModelIndex &proxyIndex) const override
  {
      QMap<int, QVariant> map = QIdentityProxyModel::itemData(proxyIndex);
      map[Qt::DisplayRole] = data(proxyIndex);
      return map;
  }

private:
  QString m_formatString;
};

另请参阅 QAbstractProxyModel、模型/视图编程和QAbstractItemModel。

成员函数文档

[显式] QIdentityProxyModel::QIdentityProxyModel(QObject *parent = nullptr)

使用给定的 父对象 构造一个单位模型。

[虚拟 noexcept] QIdentityProxyModel::~QIdentityProxyModel()

销毁此单位模型。

[覆盖虚拟] int QIdentityProxyModel::columnCount(const QModelIndex &parent = QModelIndex()) const

重新实现: QAbstractItemModel::columnCount(const QModelIndex &parent) const.

[覆盖虚拟] bool QIdentityProxyModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent)

重新实现: QAbstractProxyModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent).

[覆盖虚拟] QVariant QIdentityProxyModel::headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const

重新实现: QAbstractProxyModel::headerData(int section, Qt::Orientation orientation, int role) const.

[覆盖虚拟] QModelIndex QIdentityProxyModel::index(int row, int column, const QModelIndex &parent = QModelIndex()) const

重实：[含字符 & 和 ] QAbstractItemModel::index(int row, int column, const QModelIndex &parent) const.

[重载虚函数] bool QIdentityProxyModel::insertColumns(int column, int count, const QModelIndex &parent = QModelIndex())

重实：[含字符 & 和 ] QAbstractItemModel::insertColumns(int column, int count, const QModelIndex &parent).

[重载虚函数] bool QIdentityProxyModel::insertRows(int row, int count, const QModelIndex &parent = QModelIndex())

重实：[含字符 & 和 ] QAbstractItemModel::insertRows(int row, int count, const QModelIndex &parent).

[重载虚函数] QModelIndex QIdentityProxyModel::mapFromSource(const QModelIndex &sourceIndex) const

重实：[含字符 & 和 ] QAbstractProxyModel::mapFromSource(const QModelIndex &sourceIndex) const.

[重载虚函数] QItemSelection QIdentityProxyModel::mapSelectionFromSource(const QItemSelection &selection) const

重实：[含字符 & 和 ] QAbstractProxyModel::mapSelectionFromSource(const QItemSelection &sourceSelection) const.

[重载虚函数] QItemSelection QIdentityProxyModel::mapSelectionToSource(const QItemSelection &selection) const

重实：[含字符 & 和 ] QAbstractProxyModel::mapSelectionToSource(const QItemSelection &proxySelection) const.

[重载虚函数] QModelIndex QIdentityProxyModel::mapToSource(const QModelIndex &proxyIndex) const

重实：[含字符 & 和 ] QAbstractProxyModel::mapToSource(const QModelIndex &proxyIndex) const.

[重载虚函数] QModelIndexList QIdentityProxyModel::match(const QModelIndex &start, int role, const QVariant &value, int hits = 1, Qt::MatchFlags flags = Qt::MatchFlags(Qt::MatchStartsWith|Qt::MatchWrap)) const

重实：[含字符 & 和 ] QAbstractItemModel::match(const QModelIndex &start, int role, const QVariant &value, int hits, Qt::MatchFlags flags) const.

[重载虚函数] bool QIdentityProxyModel::moveColumns(const QModelIndex &sourceParent, int sourceColumn, int count, const QModelIndex &destinationParent, int destinationChild)

重实：[含字符 & 和 ] QAbstractItemModel::moveColumns(const QModelIndex &sourceParent, int sourceColumn, int count, const QModelIndex &destinationParent, int destinationChild).

[覆写虚函数] bool QIdentityProxyModel::moveRows(const QModelIndex &sourceParent, int sourceRow, int count, const QModelIndex &destinationParent, int destinationChild)

重写: QAbstractItemModel::moveRows(const QModelIndex &sourceParent, int sourceRow, int count, const QModelIndex &destinationParent, int destinationChild).

[覆写虚函数] QModelIndex QIdentityProxyModel::parent(const QModelIndex &child) const

重写: QAbstractItemModel::parent(const QModelIndex &index) const.

[覆写虚函数] bool QIdentityProxyModel::removeColumns(int column, int count, const QModelIndex &parent = QModelIndex())

重写: QAbstractItemModel::removeColumns(int column, int count, const QModelIndex &parent).

[覆写虚函数] bool QIdentityProxyModel::removeRows(int row, int count, const QModelIndex &parent = QModelIndex())

重写: QAbstractItemModel::removeRows(int row, int count, const QModelIndex &parent).

[覆写虚函数] int QIdentityProxyModel::rowCount(const QModelIndex &parent = QModelIndex()) const

重写: QAbstractItemModel::rowCount(const QModelIndex &parent) const.

[覆写虚函数] void QIdentityProxyModel::setSourceModel(QAbstractItemModel *newSourceModel)

重写: QAbstractProxyModel::setSourceModel(QAbstractItemModel *sourceModel).

[覆写虚函数] QModelIndex QIdentityProxyModel::sibling(int row, int column, const QModelIndex &idx) const

重写: QAbstractProxyModel::sibling(int row, int column, const QModelIndex &idx) const.

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