Qt 4.3: QUndoView Class Reference

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# QUndoView Class Reference
[QtGui module]

The QUndoView class displays the contents of a QUndoStack. More...

     #include <QUndoView>

Inherits QListView.

This class was introduced in Qt 4.2.

- List of all members, including inherited members

### Properties

- cleanIcon : QIcon
- emptyLabel : QString

- 13 properties inherited from QListView
- 14 properties inherited from QAbstractItemView
- 2 properties inherited from QAbstractScrollArea
- 6 properties inherited from QFrame
- 56 properties inherited from QWidget
- 1 property inherited from QObject

### Public Functions

- QUndoView ( QWidget * parent = 0 )
- QUndoView ( QUndoStack * stack, QWidget * parent = 0 )
- QUndoView ( QUndoGroup * group, QWidget * parent = 0 )
- ~QUndoView ()
- QIcon cleanIcon () const
- QString emptyLabel () const
- QUndoGroup * group () const
- void setCleanIcon ( const QIcon & icon )
- void setEmptyLabel ( const QString & label )
- QUndoStack * stack () const

- 29 public functions inherited from QListView
- 52 public functions inherited from QAbstractItemView
- 15 public functions inherited from QAbstractScrollArea
- 13 public functions inherited from QFrame
- 201 public functions inherited from QWidget
- 29 public functions inherited from QObject
- 12 public functions inherited from QPaintDevice

### Public Slots

- void setGroup ( QUndoGroup * group )
- void setStack ( QUndoStack * stack )

- 9 public slots inherited from QAbstractItemView
- 19 public slots inherited from QWidget
- 1 public slot inherited from QObject

### Additional Inherited Members

- 1 signal inherited from QListView
- 6 signals inherited from QAbstractItemView
- 1 signal inherited from QWidget
- 1 signal inherited from QObject
- 4 static public members inherited from QWidget
- 5 static public members inherited from QObject
- 2 protected functions inherited from QListView
- 33 protected functions inherited from QAbstractItemView
- 16 protected functions inherited from QAbstractScrollArea
- 38 protected functions inherited from QWidget
- 7 protected functions inherited from QObject
- 1 protected function inherited from QPaintDevice
- 8 protected slots inherited from QAbstractItemView
- 1 protected slot inherited from QAbstractScrollArea
- 1 protected slot inherited from QWidget

## Detailed Description

The QUndoView class displays the contents of a QUndoStack.

QUndoView is a QListView which displays the list of commands pushed on an undo stack. The most recently executed command is always selected. Selecting a different command results in a call to QUndoStack::setIndex(), rolling the state of the document backwards or forward to the new command.

The stack can be set explicitly with setStack(). Alternatively, a QUndoGroup object can be set with setGroup(). The view will then update itself automatically whenever the active stack of the group changes.

## Property Documentation

### cleanIcon : QIcon

This property holds the icon used to represent the clean state.

A stack may have a clean state set with QUndoStack::setClean(). This is usually the state of the document at the point it was saved. QUndoView can display an icon in the list of commands to show the clean state. If this proprety is a null icon, no icon is shown. The default value is the null icon.

Access functions:

- QIcon cleanIcon () const
- void setCleanIcon ( const QIcon & icon )

### emptyLabel : QString

This property holds the label used for the empty state.

The empty label is the topmost element in the list of commands, which represents the state of the document before any commands were pushed on the stack. The default is the string "<empty>".

Access functions:

- QString emptyLabel () const
- void setEmptyLabel ( const QString & label )

## Member Function Documentation

### QUndoView::QUndoView ( QWidget * parent = 0 )

Constructs a new view with parent parent.

### QUndoView::QUndoView ( QUndoStack * stack, QWidget * parent = 0 )

Constructs a new view with parent parent and sets the observed stack to stack.

### QUndoView::QUndoView ( QUndoGroup * group, QWidget * parent = 0 )

Constructs a new view with parent parent and sets the observed group to group.

The view will update itself autmiatically whenever the active stack of the group changes.

### QUndoView::~QUndoView ()

Destroys this view.

### QUndoGroup * QUndoView::group () const

Returns the group displayed by this view.

If the view is not looking at group, this function returns 0.

See also setGroup() and setStack().

### void QUndoView::setGroup ( QUndoGroup * group ) `[slot]`

Sets the group displayed by this view to group. If group is 0, the view will be empty.

The view will update itself autmiatically whenever the active stack of the group changes.

See also group() and setStack().

### void QUndoView::setStack ( QUndoStack * stack ) `[slot]`

Sets the stack displayed by this view to stack. If stack is 0, the view will be empty.

If the view was previously looking at a QUndoGroup, the group is set to 0.

See also stack() and setGroup().

### QUndoStack * QUndoView::stack () const

Returns the stack currently displayed by this view. If the view is looking at a QUndoGroup, this the group's active stack.

See also setStack() and setGroup().