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# Class DisclosurePanel

public final class DisclosurePanel
extends Composite
implements FiresDisclosureEvents, HasWidgets
A widget that consists of a header and a content panel that discloses the content when a user clicks on the header.

### CSS Style Rules

- .gwt-DisclosurePanel { the panel's primary style }
- .gwt-DisclosurePanel-open { dependent style set when panel is open }
- .gwt-DisclosurePanel-closed { dependent style set when panel is closed }
- .header { the header section }
- .content { the content section }

The header and content sections can be easily selected using css with a child selector:
.gwt-DisclosurePanel-open .header { ... }

## Constructors

DisclosurePanel() | Creates an empty DisclosurePanel that is initially closed.
DisclosurePanel(DisclosurePanelImages, String, boolean) | Creates a DisclosurePanel with the specified header text, an initial open/close state and a bundle of images to be used in the default header widget.
DisclosurePanel(String) | Creates a DisclosurePanel that will be initially closed using the specified text in the header.
DisclosurePanel(String, boolean) | Creates a DisclosurePanel with the specified header text and an initial open/close state.
DisclosurePanel(Widget) | Creates a DisclosurePanel that will be initially closed using a widget as the header.
DisclosurePanel(Widget, boolean) | Creates a DisclosurePanel using a widget as the header and an initial open/close state.

## Methods

add(Widget) | Adds a child widget.
addEventHandler(DisclosureHandler) | Attaches an event handler to the panel to receive DisclosureEvent notification.
clear() | Removes all child widgets.
getContent() | Gets the widget that was previously set in setContent(Widget).
getHeader() | Gets the widget that is currently being used as a header.
getHeaderTextAccessor() | Gets a HasText instance to provide access to the headers's text, if the header widget does provide such access.
isOpen() | Determines whether the panel is open.
iterator() | Gets an iterator for the contained widgets.
remove(Widget) | Removes a child widget.
removeEventHandler(DisclosureHandler) | Removes an event handler from the panel.
setContent(Widget) | Sets the content widget which can be opened and closed by this panel.
setHeader(Widget) | Sets the widget used as the header for the panel.
setOpen(boolean) | Changes the visible state of this `DisclosurePanel`.

## Constructor Detail

### DisclosurePanel

public DisclosurePanel()
Creates an empty DisclosurePanel that is initially closed.

### DisclosurePanel

public DisclosurePanel(DisclosurePanelImages images, String headerText, boolean isOpen)
Creates a DisclosurePanel with the specified header text, an initial open/close state and a bundle of images to be used in the default header widget.

#### Parameters

images
  a bundle that provides disclosure panel specific images
headerText
  the text to be displayed in the header
isOpen
  the initial open/close state of the content panel

### DisclosurePanel

public DisclosurePanel(String headerText)
Creates a DisclosurePanel that will be initially closed using the specified text in the header.

#### Parameters

headerText
  the text to be displayed in the header.

### DisclosurePanel

public DisclosurePanel(String headerText, boolean isOpen)
Creates a DisclosurePanel with the specified header text and an initial open/close state.

#### Parameters

headerText
  the text to be displayed in the header
isOpen
  the initial open/close state of the content panel

### DisclosurePanel

public DisclosurePanel(Widget header)
Creates a DisclosurePanel that will be initially closed using a widget as the header.

#### Parameters

header
  the widget to be used as a header

### DisclosurePanel

public DisclosurePanel(Widget header, boolean isOpen)
Creates a DisclosurePanel using a widget as the header and an initial open/close state.

#### Parameters

header
  the widget to be used as a header
isOpen
  the initial open/close state of the content panel

## Method Detail

### add

public void add(Widget w)
Adds a child widget.

#### Parameters

w
  the widget to be added

### addEventHandler

public final void addEventHandler(DisclosureHandler handler)
Attaches an event handler to the panel to receive DisclosureEvent notification.

#### Parameters

handler
  the handler to be added (should not be null)

### clear

public void clear()
Removes all child widgets.

### getContent

public final Widget getContent()
Gets the widget that was previously set in setContent(Widget).

#### Return Value

the panel's current content widget

### getHeader

public final Widget getHeader()
Gets the widget that is currently being used as a header.

#### Return Value

the widget currently being used as a header

### getHeaderTextAccessor

public final HasText getHeaderTextAccessor()
Gets a HasText instance to provide access to the headers's text, if the header widget does provide such access.

#### Return Value

a reference to the header widget if it implements HasText, `null` otherwise

### isOpen

public final boolean isOpen()
Determines whether the panel is open.

#### Return Value

`true` if panel is in open state

### iterator

public Iterator iterator()
Gets an iterator for the contained widgets. This iterator is required to implement Iterator.remove().

### remove

public boolean remove(Widget w)
Removes a child widget.

#### Parameters

w
  the widget to be removed

#### Return Value

`true` if the widget was present

### removeEventHandler

public final void removeEventHandler(DisclosureHandler handler)
Removes an event handler from the panel.

#### Parameters

handler
  the handler to be removed

### setContent

public final void setContent(Widget content)
Sets the content widget which can be opened and closed by this panel. If there is a preexisting content widget, it will be detached.

#### Parameters

content
  the widget to be used as the content panel

### setHeader

public final void setHeader(Widget headerWidget)
Sets the widget used as the header for the panel.

#### Parameters

headerWidget
  the widget to be used as the header

### setOpen

public final void setOpen(boolean isOpen)
Changes the visible state of this `DisclosurePanel`.

#### Parameters

isOpen
  `true` to open the panel, `false` to close