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# Q3CheckListItem Class Reference
[Qt3Support module]

The Q3CheckListItem class provides checkable list view items. More...

     #include <Q3CheckListItem>

This class is part of the Qt 3 support library. It is provided to keep old source code working. We strongly advise against using it in new code. See Porting to Qt 4 for more information.

Inherits Q3ListViewItem.

- List of all members, including inherited members

## Public Types

enum | ToggleState { Off, NoChange, On }
enum | Type { RadioButton, CheckBox, RadioButtonController, CheckBoxController }

## Public Functions

| Q3CheckListItem ( Q3CheckListItem * parent, const QString & text, Type tt = RadioButtonController )
| Q3CheckListItem ( Q3CheckListItem * parent, Q3ListViewItem * after, const QString & text, Type tt = RadioButtonController )
| Q3CheckListItem ( Q3ListViewItem * parent, const QString & text, Type tt = RadioButtonController )
| Q3CheckListItem ( Q3ListViewItem * parent, Q3ListViewItem * after, const QString & text, Type tt = RadioButtonController )
| Q3CheckListItem ( Q3ListView * parent, const QString & text, Type tt = RadioButtonController )
| Q3CheckListItem ( Q3ListView * parent, Q3ListViewItem * after, const QString & text, Type tt = RadioButtonController )
| Q3CheckListItem ( Q3ListViewItem * parent, const QString & text, const QPixmap & p )
| Q3CheckListItem ( Q3ListView * parent, const QString & text, const QPixmap & p )
| ~Q3CheckListItem ()
bool | isOn () const
bool | isTristate () const
virtual void | setOn ( bool b )
void | setState ( ToggleState s )
void | setTristate ( bool b )
ToggleState | state () const
QString | text () const
Type | type () const

## Reimplemented Public Functions

virtual void | paintCell ( QPainter * p, const QColorGroup & cg, int column, int width, int align )
virtual void | paintFocus ( QPainter * p, const QColorGroup & cg, const QRect & r )
virtual int | rtti () const
virtual void | setup ()
virtual QString | text ( int n ) const
virtual int | width ( const QFontMetrics & fm, const Q3ListView * lv, int column ) const

- 54 public functions inherited from Q3ListViewItem

## Protected Functions

virtual void | stateChange ( bool b )
void | turnOffChild ()

## Reimplemented Protected Functions

virtual void | activate ()

- 9 protected functions inherited from Q3ListViewItem

## Detailed Description

The Q3CheckListItem class provides checkable list view items.

Q3CheckListItems are used in Q3ListViews to provide Q3ListViewItems that are checkboxes, radio buttons or controllers.

Checkbox and controller check list items may be inserted at any level in a list view. Radio button check list items must be children of a controller check list item.

The item can be checked or unchecked with setOn(). Its type can be retrieved with type() and its text retrieved with text().

See also Q3ListViewItem and Q3ListView.

## Member Type Documentation

### enum Q3CheckListItem::ToggleState

This enum specifies a Q3CheckListItem's toggle state.

Constant | Value
--- | ---
`Q3CheckListItem::Off` | `0`
`Q3CheckListItem::NoChange` | `1`
`Q3CheckListItem::On` | `2`

### enum Q3CheckListItem::Type

This enum type specifies a Q3CheckListItem's type:

Constant | Value
--- | ---
`Q3CheckListItem::RadioButton` | `0`
`Q3CheckListItem::CheckBox` | `1`
`Q3CheckListItem::RadioButtonController` | `Controller`
`Q3CheckListItem::CheckBoxController` | ?

## Member Function Documentation

### Q3CheckListItem::Q3CheckListItem ( Q3CheckListItem * parent, const QString & text, Type tt = RadioButtonController )

Constructs a checkable item with parent parent, text text and of type tt. Note that a `RadioButton` must be the child of a `RadioButtonController`, otherwise it will not toggle.

### Q3CheckListItem::Q3CheckListItem ( Q3CheckListItem * parent, Q3ListViewItem * after, const QString & text, Type tt = RadioButtonController )

Constructs a checkable item with parent parent, which is after after in the parent's list of children, and with text text and of type tt. Note that a `RadioButton` must be the child of a `RadioButtonController`, otherwise it will not toggle.

### Q3CheckListItem::Q3CheckListItem ( Q3ListViewItem * parent, const QString & text, Type tt = RadioButtonController )

Constructs a checkable item with parent parent, text text and of type tt. Note that this item must not be a `RadioButton`. Radio buttons must be children of a `RadioButtonController`.

### Q3CheckListItem::Q3CheckListItem ( Q3ListViewItem * parent, Q3ListViewItem * after, const QString & text, Type tt = RadioButtonController )

Constructs a checkable item with parent parent, which is after after in the parent's list of children, with text text and of type tt. Note that this item must not be a `RadioButton`. Radio buttons must be children of a `RadioButtonController`.

### Q3CheckListItem::Q3CheckListItem ( Q3ListView * parent, const QString & text, Type tt = RadioButtonController )

Constructs a checkable item with parent parent, text text and of type tt. Note that tt must not be `RadioButton`. Radio buttons must be children of a `RadioButtonController`.

### Q3CheckListItem::Q3CheckListItem ( Q3ListView * parent, Q3ListViewItem * after, const QString & text, Type tt = RadioButtonController )

Constructs a checkable item with parent parent, which is after after in the parent's list of children, with text text and of type tt. Note that tt must not be `RadioButton`. Radio buttons must be children of a `RadioButtonController`.

### Q3CheckListItem::Q3CheckListItem ( Q3ListViewItem * parent, const QString & text, const QPixmap & p )

Constructs a `RadioButtonController` item with parent parent, text text and pixmap p.

### Q3CheckListItem::Q3CheckListItem ( Q3ListView * parent, const QString & text, const QPixmap & p )

Constructs a `RadioButtonController` item with parent parent, text text and pixmap p.

### Q3CheckListItem::~Q3CheckListItem ()

Destroys the item, and all its children to any depth, freeing up all allocated resources.

### void Q3CheckListItem::activate () `[virtual protected]`

Reimplemented from Q3ListViewItem::activate().

Toggle check box or set radio button to on.

### bool Q3CheckListItem::isOn () const

Returns true if the item is toggled on; otherwise returns false.

### bool Q3CheckListItem::isTristate () const

Returns true if the item is tristate; otherwise returns false.

See also setTristate().

### void Q3CheckListItem::paintCell ( QPainter * p, const QColorGroup & cg, int column, int width, int align ) `[virtual]`

Reimplemented from Q3ListViewItem::paintCell().

Paints the item using the painter p and the color group cg. The item is in column column, has width width and has alignment align. (See Qt::Alignment for valid alignments.)

### void Q3CheckListItem::paintFocus ( QPainter * p, const QColorGroup & cg, const QRect & r ) `[virtual]`

Reimplemented from Q3ListViewItem::paintFocus().

Draws the focus rectangle r using the color group cg on the painter p.

### int Q3CheckListItem::rtti () const `[virtual]`

Reimplemented from Q3ListViewItem::rtti().

Returns 1.

Make your derived classes return their own values for rtti(), and you can distinguish between list view items. You should use values greater than 1000, to allow for extensions to this class.

### void Q3CheckListItem::setOn ( bool b ) `[virtual]`

Sets the button on if b is true, otherwise sets it off. Maintains radio button exclusivity.

See also isOn().

### void Q3CheckListItem::setState ( ToggleState s )

Sets the toggle state of the checklistitem to s. s can be `Off`, `NoChange` or `On`.

Tristate can only be enabled for `CheckBox` or `CheckBoxController`, therefore the `NoChange` only applies to them.

Setting the state to `On` or `Off` on a `CheckBoxController` will recursivly set the states of its children to the same state.

Setting the state to `NoChange` on a `CheckBoxController` will make it recursivly recall the previous stored state of its children. If there was no previous stored state the children are all set to `On`.

See also state().

### void Q3CheckListItem::setTristate ( bool b )

Sets tristate to b if the `Type` is either a `CheckBoxController` or a `CheckBox`.

`CheckBoxControllers` are tristate by default.

See also state() and isTristate().

### void Q3CheckListItem::setup () `[virtual]`

Reimplemented from Q3ListViewItem::setup().

### ToggleState Q3CheckListItem::state () const

Returns the state of the item.

See also setState() and Q3CheckListItem::ToggleState.

### void Q3CheckListItem::stateChange ( bool b ) `[virtual protected]`

This virtual function is called when the item changes its state. b is true if the state is `On`; otherwise the state is `Off`. `NoChange` (if tristate is enabled and the type is either `CheckBox` or `CheckBoxController`) reports the same as `Off`, so use state() to determine if the state is actually `Off` or `NoChange`.

### QString Q3CheckListItem::text () const

Returns the item's text.

### QString Q3CheckListItem::text ( int n ) const `[virtual]`

Reimplemented from Q3ListViewItem::text().

### void Q3CheckListItem::turnOffChild () `[protected]`

If this is a `RadioButtonController` that has `RadioButton` children, turn off the child that is on.

### Type Q3CheckListItem::type () const

Returns the type of this item.

### int Q3CheckListItem::width ( const QFontMetrics & fm, const Q3ListView * lv, int column ) const `[virtual]`

Reimplemented from Q3ListViewItem::width().