Google Web Toolkit
Search Google Code:

# Class WidgetCollection

public class WidgetCollection
extends Object
A simple collection of widgets to be used by panels and composites.

The main purpose of this specialized collection is to implement Iterator.remove() in a way that delegates removal to its panel. This makes it much easier for the panel to implement an iterator that supports removal of widgets.

## Constructors

WidgetCollection(HasWidgets) | Constructs a new widget collection.

## Methods

add(Widget) | Adds a widget to the end of this collection.
contains(Widget) | Determines whether a given widget is contained in this collection.
get(int) | Gets the widget at the given index.
indexOf(Widget) | Gets the index of the specified index.
insert(Widget, int) | Inserts a widget before the specified index.
iterator() | Gets an iterator on this widget collection.
remove(int) | Removes the widget at the specified index.
remove(Widget) | Removes the specified widget.
size() | Gets the number of widgets in this collection.

## Constructor Detail

### WidgetCollection

public WidgetCollection(HasWidgets parent)
Constructs a new widget collection.

#### Parameters

parent
  the container whose HasWidgets.remove(Widget) will be delegated to by the iterator's Iterator.remove() method.

## Method Detail

### add

public void add(Widget w)
Adds a widget to the end of this collection.

#### Parameters

w
  the widget to be added

### contains

public boolean contains(Widget w)
Determines whether a given widget is contained in this collection.

#### Parameters

w
  the widget to be searched for

#### Return Value

`true` if the widget is present

### get

public Widget get(int index)
Gets the widget at the given index.

#### Parameters

index
  the index to be retrieved

#### Return Value

the widget at the specified index

### indexOf

public int indexOf(Widget w)
Gets the index of the specified index.

#### Parameters

w
  the widget to be found

#### Return Value

the index of the specified widget, or `-1` if it is not found

### insert

public void insert(Widget w, int beforeIndex)
Inserts a widget before the specified index.

#### Parameters

w
  the widget to be inserted
beforeIndex
  the index before which the widget will be inserted

### iterator

public Iterator iterator()
Gets an iterator on this widget collection. This iterator is guaranteed to implement remove() in terms of its containing HasWidgets.

#### Return Value

an iterator

### remove

public void remove(int index)
Removes the widget at the specified index.

#### Parameters

index
  the index of the widget to be removed

### remove

public void remove(Widget w)
Removes the specified widget.

#### Parameters

w
  the widget to be removed

### size

public int size()
Gets the number of widgets in this collection.

#### Return Value

the number of widgets