com.trolltech.qt.core
Class QPersistentModelIndex

java.lang.Object
  com.trolltech.qt.internal.QSignalEmitterInternal
      com.trolltech.qt.QSignalEmitter
          com.trolltech.qt.QtJambiObject
              com.trolltech.qt.core.QPersistentModelIndex

All Implemented Interfaces:

QtJambiInterface, java.lang.Cloneable, java.lang.Comparable

public class QPersistentModelIndex
extends QtJambiObject
implements java.lang.Comparable, java.lang.Cloneable

The QPersistentModelIndex class is used to locate data in a data model. A QPersistentModelIndex is a model index that can be stored by an application, and later used to access information in a model. Unlike the QModelIndex class, it is safe to store a QPersistentModelIndex since the model will ensure that references to items will continue to be valid as long as they can be accessed by the model.

It is good practice to check that persistent model indexes are valid before using them.

See also:

Model/View Programming, QModelIndex, and QAbstractItemModel.

Nested Class Summary

Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter

QSignalEmitter.AbstractSignal, QSignalEmitter.PrivateSignal0, QSignalEmitter.PrivateSignal1, QSignalEmitter.PrivateSignal2, QSignalEmitter.PrivateSignal3, QSignalEmitter.PrivateSignal4, QSignalEmitter.PrivateSignal5, QSignalEmitter.PrivateSignal6, QSignalEmitter.PrivateSignal7, QSignalEmitter.PrivateSignal8, QSignalEmitter.PrivateSignal9, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9

Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal

com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal

Field Summary

Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal

currentSender

Constructor Summary

QPersistentModelIndex(com.trolltech.qt.core.QModelIndex index)
Creates a new QPersistentModelIndex that is a copy of the model index.

QPersistentModelIndex(QPersistentModelIndex other)
Creates a new QPersistentModelIndex that is a copy of the other persistent model index.

Method Summary

com.trolltech.qt.core.QModelIndex	child(int row, int column) Returns the child of the model index that is stored in the given row and column.
QPersistentModelIndex	clone() This method is reimplemented for internal reasons
int	column() Returns the column this persistent model index refers to.
int	compareTo(java.lang.Object other) Compares this object with the specified object for order.
java.lang.Object	data() Returns the data for the given role for the item referred to by the index.
java.lang.Object	data(int role) Returns the data for the given role for the item referred to by the index.
Qt.ItemFlags	flags() Returns the flags for the item referred to by the index.
boolean	isValid() Returns true if this persistent model index is valid; otherwise returns false.
QAbstractItemModel	model() Returns the model that the index belongs to.
com.trolltech.qt.core.QModelIndex	parent() Returns the parent QModelIndex for this persistent index, or QModelIndex() if it has no parent.
int	row() Returns the row this persistent model index refers to.
com.trolltech.qt.core.QModelIndex	sibling(int row, int column) Returns the sibling at row and column or an invalid QModelIndex if there is no sibling at this position.
java.lang.String	toString() Returns a string representation of the this QPersistentModelIndex.

Methods inherited from class com.trolltech.qt.QtJambiObject

dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr

Methods inherited from class com.trolltech.qt.QSignalEmitter

blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread

Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal

__qt_signalInitialization

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.trolltech.qt.QtJambiInterface

disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership

Constructor Detail

QPersistentModelIndex

public QPersistentModelIndex(com.trolltech.qt.core.QModelIndex index)

Creates a new QPersistentModelIndex that is a copy of the model index.

QPersistentModelIndex

public QPersistentModelIndex(QPersistentModelIndex other)

Creates a new QPersistentModelIndex that is a copy of the other persistent model index.

Method Detail

child

public final com.trolltech.qt.core.QModelIndex child(int row,
                                                     int column)

Returns the child of the model index that is stored in the given row and column.

See also:

parent(), and sibling().

column

public final int column()

Returns the column this persistent model index refers to.

data

public final java.lang.Object data()

Returns the data for the given role for the item referred to by the index.

See also:

Qt::ItemDataRole , and QAbstractItemModel::setData().

data

public final java.lang.Object data(int role)

Returns the data for the given role for the item referred to by the index.

See also:

Qt::ItemDataRole , and QAbstractItemModel::setData().

flags

public final Qt.ItemFlags flags()

Returns the flags for the item referred to by the index.

isValid

public final boolean isValid()

Returns true if this persistent model index is valid; otherwise returns false. A valid index belongs to a model, and has non-negative row and column numbers.

See also:

model(), row(), and column().

model

public final QAbstractItemModel model()

Returns the model that the index belongs to.

parent

public final com.trolltech.qt.core.QModelIndex parent()

Returns the parent QModelIndex for this persistent index, or QModelIndex() if it has no parent.

See also:

child(), sibling(), and model().

row

public final int row()

Returns the row this persistent model index refers to.

sibling

public final com.trolltech.qt.core.QModelIndex sibling(int row,
                                                       int column)

Returns the sibling at row and column or an invalid QModelIndex if there is no sibling at this position.

See also:

parent(), and child().

compareTo

public int compareTo(java.lang.Object other)

Compares this object with the specified object for order. Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.

Specified by:

compareTo in interface java.lang.Comparable

toString

public java.lang.String toString()

Returns a string representation of the this QPersistentModelIndex.

Overrides:

toString in class java.lang.Object

clone

public QPersistentModelIndex clone()

This method is reimplemented for internal reasons

Overrides:

clone in class java.lang.Object