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QItemSelection Class Reference

^{[ QtGui module]}

The QItemSelection class manages information about selected items in a model. 更多...

方法

• __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 )

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详细描述

The QItemSelection class manages information about selected items in a model.

A QItemSelection describes the items in a model that have been selected by the user. A QItemSelection is basically a list of selection ranges, see QItemSelectionRange . It provides functions for creating and manipulating selections, and selecting a range of items from a model.

The QItemSelection class is one of the 模型/视图类 且属于 Qt 的 模型/视图框架 .

An item selection can be constructed and initialized to contain a range of items from an existing model. The following example constructs a selection that contains a range of items from the given model , beginning at the topLeft , and ending 在 bottomRight .

 QItemSelection *selection = new QItemSelection(topLeft, bottomRight);
			

An empty item selection can be constructed, and later populated as required. So, if the model is going to be unavailable when we construct the item selection, we can rewrite the above code in the following way:

 QItemSelection *selection = new QItemSelection();
 ...
 selection->select(topLeft, bottomRight);
			

QItemSelection saves memory, and avoids unnecessary work, by working with selection ranges rather than recording the model item index for each item in the selection. Generally, an instance of this class will contain a list of non-overlapping selection ranges.

使用 merge () to merge one item selection into another without making overlapping ranges. Use split () to split one selection range into smaller ranges based on a another selection range.

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方法文档编制

QItemSelection.__init__ ( self )

Constructs an empty selection.

QItemSelection.__init__ ( self , QModelIndex   topLeft , QModelIndex   bottomRight )

Constructs an item selection that extends from the top-left model item, specified by the topLeft index, to the bottom-right item, specified by bottomRight .

QItemSelection.__init__ ( self , QItemSelection )

QItemSelection.append ( self , QItemSelectionRange   range )

QItemSelection.clear ( self )

bool QItemSelection.contains ( self , QModelIndex   index )

Returns true if the selection contains the given index ; otherwise returns false.

int QItemSelection.count ( self , QItemSelectionRange   range )

int QItemSelection.count ( self )

QItemSelectionRange QItemSelection.first ( self )

list-of-QModelIndex QItemSelection.indexes ( self )

Returns a list of model indexes that correspond to the selected 项。

int QItemSelection.indexOf ( self , QItemSelectionRange   value , int  from  = 0)

QItemSelection.insert ( self , int  i , QItemSelectionRange   range )

bool QItemSelection.isEmpty ( self )

QItemSelectionRange QItemSelection.last ( self )

int QItemSelection.lastIndexOf ( self , QItemSelectionRange   value , int  from  = -1)

QItemSelection.merge ( self , QItemSelection   other , QItemSelectionModel.SelectionFlags   command )

Merges the other selection with this QItemSelection 使用 command given. This method guarantees that no ranges are overlapping.

Note that only QItemSelectionModel.Select , QItemSelectionModel.Deselect , and QItemSelectionModel.Toggle are supported.

另请参阅 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 )

Adds the items in the range that extends from the top-left model item, specified by the topLeft index, to the bottom-right item, specified by bottomRight to the list.

注意： topLeft and bottomRight must have the same parent.

QItemSelection.split ( QItemSelectionRange   range , QItemSelectionRange   other , QItemSelection   result )

Splits the selection range using the selection other range. Removes all items in other from range and puts the result in result . This can be compared with the semantics of the subtract operation of a set.

另请参阅 merge ().

QItemSelection.swap ( self , int  i , int  j )

QItemSelectionRange QItemSelection.takeAt ( self , int  i )

QItemSelectionRange QItemSelection.takeFirst ( self )

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 QItemSelection.__getitem__ ( self , int  i )

QItemSelection QItemSelection.__getitem__ ( self , slice  slice )

QItemSelection QItemSelection.__iadd__ ( self , QItemSelection   other )

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 )

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