QItemSelection Class Reference · PyQt4 中文文档

# QItemSelection Class Reference ## [[QtGui](index.htm) module] 该QItemSelection类管理有关模型中的选定项目的信息。[More...](#details) ### Methods * `__init__ (self)` * `__init__ (self, QModelIndex topLeft, QModelIndex bottomRight)` * `__init__ (self, QItemSelection)` * `append (self, QItemSelectionRange range)` * `clear (self)` * `bool contains (self, QModelIndex index)` * `int count (self, QItemSelectionRange range)` * `int count (self)` * `QItemSelectionRange first (self)` * `list-of-QModelIndex indexes (self)` * `int indexOf (self, QItemSelectionRange value, int from = 0)` * `insert (self, int i, QItemSelectionRange range)` * `bool isEmpty (self)` * `QItemSelectionRange last (self)` * `int lastIndexOf (self, QItemSelectionRange value, int from = -1)` * `merge (self, QItemSelection other, QItemSelectionModel.SelectionFlags command)` * `move (self, int from, int to)` * `prepend (self, QItemSelectionRange range)` * `int removeAll (self, QItemSelectionRange range)` * `removeAt (self, int i)` * `replace (self, int i, QItemSelectionRange range)` * `select (self, QModelIndex topLeft, QModelIndex bottomRight)` * `swap (self, int i, int j)` * `QItemSelectionRange takeAt (self, int i)` * `QItemSelectionRange takeFirst (self)` * `QItemSelectionRange takeLast (self)` ### Static Methods * `split (QItemSelectionRange range, QItemSelectionRange other, QItemSelection result)` ### Special Methods * `int __contains__ (self, QModelIndex index)` * `__delitem__ (self, int i)` * `__delitem__ (self, slice slice)` * `bool __eq__ (self, QItemSelection other)` * `QItemSelectionRange __getitem__ (self, int i)` * `QItemSelection __getitem__ (self, slice slice)` * `QItemSelection __iadd__ (self, QItemSelection other)` * `QItemSelection __iadd__ (self, QItemSelectionRange value)` * `__len__ (self)` * `bool __ne__ (self, QItemSelection other)` * `__setitem__ (self, int i, QItemSelectionRange range)` * `__setitem__ (self, slice slice, QItemSelection list)` * * * ## Detailed Description 该QItemSelection类管理有关模型中的选定项目的信息。甲QItemSelection描述在已经由用户选择的模式中的项目。一个QItemSelection基本上是选择范围列表，请参阅[QItemSelectionRange](qitemselectionrange.html)。它提供了用于创建和操作选择，并从模型中选择一个范围内的项目。该QItemSelection类是一个[Model/View Classes](index.htm)并且是Qt的一部分[model/view framework](index.htm)。项目选择可以构造并初始化为包含范围从现有的模型项目。下面的示例构造一个包含从给定的各类物品的选择`model`，开始在`topLeft`，和结束的`bottomRight`。 ``` QItemSelection *selection = new QItemSelection(topLeft, bottomRight); ``` 一个空的项目选择可以构造，后来填充的要求。因此，如果模型要当我们构建了项目选择为不可用，我们可以重写上面的代码中的方法如下： ``` QItemSelection *selection = new QItemSelection(); ... selection->select(topLeft, bottomRight); ``` QItemSelection节省内存，并避免不必要的工作，通过与选择范围工作，而不是记录的模型项目的索引为每个项目中选择。一般来说，这个类的实例将包含非重叠选择范围的列表。使用[merge](qitemselection.html#merge)（）合并一个项目的选择到另一个未做重叠的范围。使用[split](qitemselection.html#split)（）的基础上另外一个选择范围分割一个选择范围为更小的范围。 * * * ## Method Documentation ``` QItemSelection.__init__ (self) ``` 构造一个空的选择。 ``` QItemSelection.__init__ (self, QModelIndex topLeft, QModelIndex bottomRight) ``` 构造一个项目选择，从左上角模型项目延伸，由指定的_topLeft_指数，在右下角项目，由指定的_bottomRight_。 ``` QItemSelection.__init__ (self, QItemSelection) ``` ``` QItemSelection.append (self, QItemSelectionRange range) ``` ``` QItemSelection.clear (self) ``` ``` bool QItemSelection.contains (self, QModelIndex index) ``` 如果选择包含给定的，则返回True_index_否则返回False 。 ``` int QItemSelection.count (self, QItemSelectionRange range) ``` ``` int QItemSelection.count (self) ``` ``` QItemSelectionRange QItemSelection.first (self) ``` [ ``` list-of-QModelIndex QItemSelection.indexes (self) ``` 返回对应于所选择的项的模型索引的列表。 ``` int QItemSelection.indexOf (self, QItemSelectionRange value, int from = 0) ``` ``` QItemSelection.insert (self, int i, QItemSelectionRange range) ``` ``` bool QItemSelection.isEmpty (self) ``` ](qitemselectionrange.html) ``` QItemSelectionRange QItemSelection.last (self) ``` [ ``` int QItemSelection.lastIndexOf (self, QItemSelectionRange value, int from = -1) ``` ``` QItemSelection.merge (self, QItemSelection other, QItemSelectionModel.SelectionFlags command) ``` ](qitemselectionrange.html) [合并的_other_选择与此](qitemselectionrange.html)[QItemSelection](qitemselection.html)使用_command_给出。这种方法保证了没有范围是重叠的。请注意，只有[QItemSelectionModel.Select](qitemselectionmodel.html#SelectionFlag-enum)，[QItemSelectionModel.Deselect](qitemselectionmodel.html#SelectionFlag-enum)和[QItemSelectionModel.Toggle](qitemselectionmodel.html#SelectionFlag-enum)被支持。 **See also** [split](qitemselection.html#split)（）。 ``` QItemSelection.move (self, int from, int to) ``` ``` QItemSelection.prepend (self, QItemSelectionRange range) ``` ``` int QItemSelection.removeAll (self, QItemSelectionRange range) ``` ``` QItemSelection.removeAt (self, int i) ``` ``` QItemSelection.replace (self, int i, QItemSelectionRange range) ``` ``` QItemSelection.select (self, QModelIndex topLeft, QModelIndex bottomRight) ``` 添加该范围中的项目，从左上角的模型项上延伸，由指定的_topLeft_指数，在右下角项目，由指定的_bottomRight_到列表中。 **Note:** _topLeft_和_bottomRight_必须具有相同的父代。 ``` QItemSelection.split (QItemSelectionRange range, QItemSelectionRange other, QItemSelection result) ``` 拆分选择_range_使用选择_other_范围。在删除所有项目_other_从_range_并将该结果_result_。这可以用的语义进行比较_subtract_的一组操作。 **See also** [merge](qitemselection.html#merge)（）。 ``` QItemSelection.swap (self, int i, int j) ``` ``` QItemSelectionRange QItemSelection.takeAt (self, int i) ``` [](qitemselectionrange.html) ``` QItemSelectionRange QItemSelection.takeFirst (self) ``` [](qitemselectionrange.html) ``` QItemSelectionRange QItemSelection.takeLast (self) ``` [ ``` int QItemSelection.__contains__ (self, QModelIndex index) ``` ``` QItemSelection.__delitem__ (self, int i) ``` ``` QItemSelection.__delitem__ (self, slice slice) ``` ``` bool QItemSelection.__eq__ (self, QItemSelection other) ``` ](qitemselectionrange.html) ``` QItemSelectionRange QItemSelection.__getitem__ (self, int i) ``` [](qitemselectionrange.html) ``` QItemSelection QItemSelection.__getitem__ (self, slice slice) ``` [](qitemselection.html) ``` QItemSelection QItemSelection.__iadd__ (self, QItemSelection other) ``` [](qitemselection.html) ``` QItemSelection QItemSelection.__iadd__ (self, QItemSelectionRange value) ``` [ ``` QItemSelection.__len__ (self) ``` ``` bool QItemSelection.__ne__ (self, QItemSelection other) ``` ``` QItemSelection.__setitem__ (self, int i, QItemSelectionRange range) ``` ``` QItemSelection.__setitem__ (self, slice slice, QItemSelection list) ``` ](qitemselection.html)