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com.google.gwt.user.client.ui
Class Tree

java.lang.Object
  extended by com.google.gwt.user.client.ui.UIObject
      extended by com.google.gwt.user.client.ui.Widget
          extended by com.google.gwt.user.client.ui.Tree
All Implemented Interfaces:
HasAllFocusHandlers, HasAllKeyHandlers, HasAllMouseHandlers, HasBlurHandlers, HasFocusHandlers, HasKeyDownHandlers, HasKeyPressHandlers, HasKeyUpHandlers, HasMouseDownHandlers, HasMouseMoveHandlers, HasMouseOutHandlers, HasMouseOverHandlers, HasMouseUpHandlers, HasMouseWheelHandlers, HasCloseHandlers<TreeItem>, HasOpenHandlers<TreeItem>, HasSelectionHandlers<TreeItem>, HasHandlers, EventListener, Focusable, HasAnimation, HasFocus, HasWidgets, SourcesFocusEvents, SourcesKeyboardEvents, SourcesMouseEvents, SourcesTreeEvents, java.lang.Iterable<Widget>
public class Tree
extends Widget
implements HasWidgets, SourcesTreeEvents, HasFocus, HasAnimation, HasAllKeyHandlers, HasAllFocusHandlers, HasSelectionHandlers<TreeItem>, HasOpenHandlers<TreeItem>, HasCloseHandlers<TreeItem>, SourcesMouseEvents, HasAllMouseHandlers

A standard hierarchical tree widget. The tree contains a hierarchy of TreeItems that the user can open, close, and select.

CSS Style Rules

.gwt-Tree
the tree itself
.gwt-Tree .gwt-TreeItem
a tree item
.gwt-Tree .gwt-TreeItem-selected
a selected tree item

Example

public class TreeExample implements EntryPoint {

  public void onModuleLoad() {
    // Create a tree with a few items in it.
    TreeItem root = new TreeItem("root");
    root.addItem("item0");
    root.addItem("item1");
    root.addItem("item2");

    // Add a CheckBox to the tree
    TreeItem item = new TreeItem(new CheckBox("item3"));
    root.addItem(item);

    Tree t = new Tree();
    t.addItem(root);

    // Add it to the root panel.
    RootPanel.get().add(t);
  }
}

Nested Class Summary
static interface Tree.Resources
          A ClientBundle that provides images for this widget.
 
Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject
UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled
 
Field Summary
 
Fields inherited from class com.google.gwt.user.client.ui.UIObject
DEBUG_ID_PREFIX
 
Constructor Summary
Tree()
          Constructs an empty tree.
Tree(Tree.Resources resources)
          Constructs a tree that uses the specified ClientBundle for images.
Tree(Tree.Resources resources, boolean useLeafImages)
          Constructs a tree that uses the specified ClientBundle for images.
Tree(TreeImages images)
          Deprecated. replaced by Tree(Resources)
Tree(TreeImages images, boolean useLeafImages)
          Deprecated. replaced by Tree(Resources, boolean)
 
Method Summary
 void add(Widget widget)
          Adds the widget as a root tree item.
 HandlerRegistration addBlurHandler(BlurHandler handler)
          Adds a BlurEvent handler.
 HandlerRegistration addCloseHandler(CloseHandler<TreeItem> handler)
          Adds a CloseEvent handler.
 HandlerRegistration addFocusHandler(FocusHandler handler)
          Adds a FocusEvent handler.
 void addFocusListener(FocusListener listener)
          Deprecated. Use addFocusHandler(com.google.gwt.event.dom.client.FocusHandler) instead
 TreeItem addItem(java.lang.String itemText)
          Adds a simple tree item containing the specified text.
 void addItem(TreeItem item)
          Adds an item to the root level of this tree.
 TreeItem addItem(Widget widget)
          Adds a new tree item containing the specified widget.
 void addKeyboardListener(KeyboardListener listener)
          Deprecated. Use addKeyDownHandler(com.google.gwt.event.dom.client.KeyDownHandler), addKeyUpHandler(com.google.gwt.event.dom.client.KeyUpHandler) and addKeyPressHandler(com.google.gwt.event.dom.client.KeyPressHandler) instead
 HandlerRegistration addKeyDownHandler(KeyDownHandler handler)
          Adds a KeyDownEvent handler.
 HandlerRegistration addKeyPressHandler(KeyPressHandler handler)
          Adds a KeyPressEvent handler.
 HandlerRegistration addKeyUpHandler(KeyUpHandler handler)
          Adds a KeyUpEvent handler.
 HandlerRegistration addMouseDownHandler(MouseDownHandler handler)
          Adds a MouseDownEvent handler.
 void addMouseListener(MouseListener listener)
          Deprecated. Use addMouseOverHandler(com.google.gwt.event.dom.client.MouseOverHandler) addMouseMoveHandler(com.google.gwt.event.dom.client.MouseMoveHandler), addMouseDownHandler(com.google.gwt.event.dom.client.MouseDownHandler), addMouseUpHandler(com.google.gwt.event.dom.client.MouseUpHandler) and addMouseOutHandler(com.google.gwt.event.dom.client.MouseOutHandler) instead
 HandlerRegistration addMouseMoveHandler(MouseMoveHandler handler)
          Adds a MouseMoveEvent handler.
 HandlerRegistration addMouseOutHandler(MouseOutHandler handler)
          Adds a MouseOutEvent handler.
 HandlerRegistration addMouseOverHandler(MouseOverHandler handler)
          Adds a MouseOverEvent handler.
 HandlerRegistration addMouseUpHandler(MouseUpHandler handler)
          Adds a MouseUpEvent handler.
 HandlerRegistration addMouseWheelHandler(MouseWheelHandler handler)
          Adds a MouseWheelEvent handler.
 HandlerRegistration addOpenHandler(OpenHandler<TreeItem> handler)
          Adds a OpenEvent handler.
 HandlerRegistration addSelectionHandler(SelectionHandler<TreeItem> handler)
          Adds a SelectionEvent handler.
 void addTreeListener(TreeListener listener)
          Deprecated. Use addSelectionHandler(com.google.gwt.event.logical.shared.SelectionHandler), addOpenHandler(com.google.gwt.event.logical.shared.OpenHandler), and addCloseHandler(com.google.gwt.event.logical.shared.CloseHandler) instead
 void clear()
          Clears all tree items from the current tree.
protected  void doAttachChildren()
          If a widget contains one or more child widgets that are not in the logical widget hierarchy (the child is physically connected only on the DOM level), it must override this method and call Widget.onAttach() for each of its child widgets.
protected  void doDetachChildren()
          If a widget contains one or more child widgets that are not in the logical widget hierarchy (the child is physically connected only on the DOM level), it must override this method and call Widget.onDetach() for each of its child widgets.
 void ensureSelectedItemVisible()
          Ensures that the currently-selected item is visible, opening its parents and scrolling the tree as necessary.
 TreeItem getItem(int index)
          Gets the top-level tree item at the specified index.
 int getItemCount()
          Gets the number of items contained at the root of this tree.
 TreeItem getSelectedItem()
          Gets the currently selected item.
 int getTabIndex()
          Gets the widget's position in the tab index.
 boolean isAnimationEnabled()
           
protected  boolean isKeyboardNavigationEnabled(TreeItem currentItem)
          Indicates if keyboard navigation is enabled for the Tree and for a given TreeItem.
 java.util.Iterator<Widget> iterator()
          Gets an iterator for the contained widgets.
 void onBrowserEvent(Event event)
          Fired whenever a browser event is received.
protected  void onEnsureDebugId(java.lang.String baseID)
          Affected Elements: -root = The root TreeItem.
protected  void onLoad()
          This method is called immediately after a widget becomes attached to the browser's document.
 boolean remove(Widget w)
          Removes a child widget.
 void removeFocusListener(FocusListener listener)
          Deprecated. Use the HandlerRegistration.removeHandler() method on the object returned by addFocusHandler(com.google.gwt.event.dom.client.FocusHandler) instead
 void removeItem(TreeItem item)
          Removes an item from the root level of this tree.
 void removeItems()
          Removes all items from the root level of this tree.
 void removeKeyboardListener(KeyboardListener listener)
          Deprecated. Use the HandlerRegistration.removeHandler() method on the object returned by an add*Handler method instead
 void removeMouseListener(MouseListener listener)
          Deprecated. Use the HandlerRegistration.removeHandler() method on the object returned by an add*Handler method instead
 void removeTreeListener(TreeListener listener)
          Deprecated. Use the HandlerRegistration.removeHandler() method on the object returned by an add*Handler method instead
 void setAccessKey(char key)
          Sets the widget's 'access key'.
 void setAnimationEnabled(boolean enable)
          Enable or disable animations.
 void setFocus(boolean focus)
          Explicitly focus/unfocus this widget.
 void setSelectedItem(TreeItem item)
          Selects a specified item.
 void setSelectedItem(TreeItem item, boolean fireEvents)
          Selects a specified item.
 void setTabIndex(int index)
          Sets the widget's position in the tab index.
 java.util.Iterator<TreeItem> treeItemIterator()
          Iterator of tree items.
 
Methods inherited from class com.google.gwt.user.client.ui.Widget
addDomHandler, addHandler, delegateEvent, fireEvent, getHandlerCount, getLayoutData, getParent, isAttached, isOrWasAttached, onAttach, onDetach, onUnload, removeFromParent, setLayoutData, sinkEvents
 
Methods inherited from class com.google.gwt.user.client.ui.UIObject
addStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, removeStyleDependentName, removeStyleName, setElement, setElement, setHeight, setPixelSize, setSize, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setVisible, setWidth, toString, unsinkEvents
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface com.google.gwt.event.shared.HasHandlers
fireEvent
 

Constructor Detail

Tree

public Tree()
Constructs an empty tree.

Tree

public Tree(Tree.Resources resources)
Constructs a tree that uses the specified ClientBundle for images.

Parameters:
resources - a bundle that provides tree specific images

Tree

public Tree(Tree.Resources resources,
            boolean useLeafImages)
Constructs a tree that uses the specified ClientBundle for images. If this tree does not use leaf images, the width of the Resources's leaf image will control the leaf indent.

Parameters:
resources - a bundle that provides tree specific images
useLeafImages - use leaf images from bundle

Tree

@Deprecated
public Tree(TreeImages images)
Deprecated. replaced by Tree(Resources)

Constructs a tree that uses the specified image bundle for images.

Parameters:
images - a bundle that provides tree specific images

Tree

@Deprecated
public Tree(TreeImages images,
                       boolean useLeafImages)
Deprecated. replaced by Tree(Resources, boolean)

Constructs a tree that uses the specified image bundle for images. If this tree does not use leaf images, the width of the TreeImage's leaf image will control the leaf indent.

Parameters:
images - a bundle that provides tree specific images
useLeafImages - use leaf images from bundle
Method Detail

add

public void add(Widget widget)
Adds the widget as a root tree item.

Specified by:
add in interface HasWidgets
Parameters:
widget - widget to add.
See Also:
HasWidgets.add(com.google.gwt.user.client.ui.Widget)

addBlurHandler

public HandlerRegistration addBlurHandler(BlurHandler handler)
Description copied from interface: HasBlurHandlers
Adds a BlurEvent handler.

Specified by:
addBlurHandler in interface HasBlurHandlers
Parameters:
handler - the blur handler
Returns:
HandlerRegistration used to remove this handler

addCloseHandler

public HandlerRegistration addCloseHandler(CloseHandler<TreeItem> handler)
Description copied from interface: HasCloseHandlers
Adds a CloseEvent handler.

Specified by:
addCloseHandler in interface HasCloseHandlers<TreeItem>
Parameters:
handler - the handler
Returns:
the registration for the event

addFocusHandler

public HandlerRegistration addFocusHandler(FocusHandler handler)
Description copied from interface: HasFocusHandlers
Adds a FocusEvent handler.

Specified by:
addFocusHandler in interface HasFocusHandlers
Parameters:
handler - the focus handler
Returns:
HandlerRegistration used to remove this handler

addFocusListener

@Deprecated
public void addFocusListener(FocusListener listener)
Deprecated. Use addFocusHandler(com.google.gwt.event.dom.client.FocusHandler) instead

Description copied from interface: SourcesFocusEvents
Adds a listener interface to receive focus events.

Specified by:
addFocusListener in interface SourcesFocusEvents
Parameters:
listener - the listener interface to add

addItem

public TreeItem addItem(java.lang.String itemText)
Adds a simple tree item containing the specified text.

Parameters:
itemText - the text of the item to be added
Returns:
the item that was added

addItem

public void addItem(TreeItem item)
Adds an item to the root level of this tree.

Parameters:
item - the item to be added

addItem

public TreeItem addItem(Widget widget)
Adds a new tree item containing the specified widget.

Parameters:
widget - the widget to be added
Returns:
the new item

addKeyboardListener

@Deprecated
public void addKeyboardListener(KeyboardListener listener)
Deprecated. Use addKeyDownHandler(com.google.gwt.event.dom.client.KeyDownHandler), addKeyUpHandler(com.google.gwt.event.dom.client.KeyUpHandler) and addKeyPressHandler(com.google.gwt.event.dom.client.KeyPressHandler) instead

Description copied from interface: SourcesKeyboardEvents
Adds a listener interface to receive keyboard events.

Specified by:
addKeyboardListener in interface SourcesKeyboardEvents
Parameters:
listener - the listener interface to add

addKeyDownHandler

public HandlerRegistration addKeyDownHandler(KeyDownHandler handler)
Description copied from interface: HasKeyDownHandlers
Adds a KeyDownEvent handler.

Specified by:
addKeyDownHandler in interface HasKeyDownHandlers
Parameters:
handler - the key down handler
Returns:
HandlerRegistration used to remove this handler

addKeyPressHandler

public HandlerRegistration addKeyPressHandler(KeyPressHandler handler)
Description copied from interface: HasKeyPressHandlers
Adds a KeyPressEvent handler.

Specified by:
addKeyPressHandler in interface HasKeyPressHandlers
Parameters:
handler - the key press handler
Returns:
HandlerRegistration used to remove this handler

addKeyUpHandler

public HandlerRegistration addKeyUpHandler(KeyUpHandler handler)
Description copied from interface: HasKeyUpHandlers
Adds a KeyUpEvent handler.

Specified by:
addKeyUpHandler in interface HasKeyUpHandlers
Parameters:
handler - the key up handler
Returns:
HandlerRegistration used to remove this handler

addMouseDownHandler

public HandlerRegistration addMouseDownHandler(MouseDownHandler handler)
Description copied from interface: HasMouseDownHandlers
Adds a MouseDownEvent handler.

Specified by:
addMouseDownHandler in interface HasMouseDownHandlers
Parameters:
handler - the mouse down handler
Returns:
HandlerRegistration used to remove this handler

addMouseListener

@Deprecated
public void addMouseListener(MouseListener listener)
Deprecated. Use addMouseOverHandler(com.google.gwt.event.dom.client.MouseOverHandler) addMouseMoveHandler(com.google.gwt.event.dom.client.MouseMoveHandler), addMouseDownHandler(com.google.gwt.event.dom.client.MouseDownHandler), addMouseUpHandler(com.google.gwt.event.dom.client.MouseUpHandler) and addMouseOutHandler(com.google.gwt.event.dom.client.MouseOutHandler) instead

Description copied from interface: SourcesMouseEvents
Adds a listener interface to receive mouse events.

Specified by:
addMouseListener in interface SourcesMouseEvents
Parameters:
listener - the listener interface to add

addMouseMoveHandler

public HandlerRegistration addMouseMoveHandler(MouseMoveHandler handler)
Description copied from interface: HasMouseMoveHandlers
Adds a MouseMoveEvent handler.

Specified by:
addMouseMoveHandler in interface HasMouseMoveHandlers
Parameters:
handler - the mouse move handler
Returns:
HandlerRegistration used to remove this handler

addMouseOutHandler

public HandlerRegistration addMouseOutHandler(MouseOutHandler handler)
Description copied from interface: HasMouseOutHandlers
Adds a MouseOutEvent handler.

Specified by:
addMouseOutHandler in interface HasMouseOutHandlers
Parameters:
handler - the mouse out handler
Returns:
HandlerRegistration used to remove this handler

addMouseOverHandler

public HandlerRegistration addMouseOverHandler(MouseOverHandler handler)
Description copied from interface: HasMouseOverHandlers
Adds a MouseOverEvent handler.

Specified by:
addMouseOverHandler in interface HasMouseOverHandlers
Parameters:
handler - the mouse over handler
Returns:
HandlerRegistration used to remove this handler

addMouseUpHandler

public HandlerRegistration addMouseUpHandler(MouseUpHandler handler)
Description copied from interface: HasMouseUpHandlers
Adds a MouseUpEvent handler.

Specified by:
addMouseUpHandler in interface HasMouseUpHandlers
Parameters:
handler - the mouse up handler
Returns:
HandlerRegistration used to remove this handler

addMouseWheelHandler

public HandlerRegistration addMouseWheelHandler(MouseWheelHandler handler)
Description copied from interface: HasMouseWheelHandlers
Adds a MouseWheelEvent handler.

Specified by:
addMouseWheelHandler in interface HasMouseWheelHandlers
Parameters:
handler - the mouse wheel handler
Returns:
HandlerRegistration used to remove this handler

addOpenHandler

public final HandlerRegistration addOpenHandler(OpenHandler<TreeItem> handler)
Description copied from interface: HasOpenHandlers
Adds a OpenEvent handler.

Specified by:
addOpenHandler in interface HasOpenHandlers<TreeItem>
Parameters:
handler - the handler
Returns:
the registration for the event

addSelectionHandler

public HandlerRegistration addSelectionHandler(SelectionHandler<TreeItem> handler)
Description copied from interface: HasSelectionHandlers
Adds a SelectionEvent handler.

Specified by:
addSelectionHandler in interface HasSelectionHandlers<TreeItem>
Parameters:
handler - the handler
Returns:
the registration for the event

addTreeListener

@Deprecated
public void addTreeListener(TreeListener listener)
Deprecated. Use addSelectionHandler(com.google.gwt.event.logical.shared.SelectionHandler), addOpenHandler(com.google.gwt.event.logical.shared.OpenHandler), and addCloseHandler(com.google.gwt.event.logical.shared.CloseHandler) instead

Description copied from interface: SourcesTreeEvents
Adds a listener interface to receive tree events.

Specified by:
addTreeListener in interface SourcesTreeEvents
Parameters:
listener - the listener interface to add

clear

public void clear()
Clears all tree items from the current tree.

Specified by:
clear in interface HasWidgets

ensureSelectedItemVisible

public void ensureSelectedItemVisible()
Ensures that the currently-selected item is visible, opening its parents and scrolling the tree as necessary.

getItem

public TreeItem getItem(int index)
Gets the top-level tree item at the specified index.

Parameters:
index - the index to be retrieved
Returns:
the item at that index

getItemCount

public int getItemCount()
Gets the number of items contained at the root of this tree.

Returns:
this tree's item count

getSelectedItem

public TreeItem getSelectedItem()
Gets the currently selected item.

Returns:
the selected item

getTabIndex

public int getTabIndex()
Description copied from interface: Focusable
Gets the widget's position in the tab index.

Specified by:
getTabIndex in interface Focusable
Returns:
the widget's tab index

isAnimationEnabled

public boolean isAnimationEnabled()
Specified by:
isAnimationEnabled in interface HasAnimation
Returns:
true if animations are enabled, false if not

iterator

public java.util.Iterator<Widget> iterator()
Description copied from interface: HasWidgets
Gets an iterator for the contained widgets. This iterator is required to implement Iterator.remove().

Specified by:
iterator in interface HasWidgets
Specified by:
iterator in interface java.lang.Iterable<Widget>

onBrowserEvent

public void onBrowserEvent(Event event)
Description copied from interface: EventListener
Fired whenever a browser event is received.

Specified by:
onBrowserEvent in interface EventListener
Overrides:
onBrowserEvent in class Widget
Parameters:
event - the event received

remove

public boolean remove(Widget w)
Description copied from interface: HasWidgets
Removes a child widget.

Specified by:
remove in interface HasWidgets
Parameters:
w - the widget to be removed
Returns:
true if the widget was present

removeFocusListener

@Deprecated
public void removeFocusListener(FocusListener listener)
Deprecated. Use the HandlerRegistration.removeHandler() method on the object returned by addFocusHandler(com.google.gwt.event.dom.client.FocusHandler) instead

Description copied from interface: SourcesFocusEvents
Removes a previously added listener interface.

Specified by:
removeFocusListener in interface SourcesFocusEvents
Parameters:
listener - the listener interface to remove

removeItem

public void removeItem(TreeItem item)
Removes an item from the root level of this tree.

Parameters:
item - the item to be removed

removeItems

public void removeItems()
Removes all items from the root level of this tree.

removeKeyboardListener

@Deprecated
public void removeKeyboardListener(KeyboardListener listener)
Deprecated. Use the HandlerRegistration.removeHandler() method on the object returned by an add*Handler method instead

Description copied from interface: SourcesKeyboardEvents
Removes a previously added listener interface.

Specified by:
removeKeyboardListener in interface SourcesKeyboardEvents
Parameters:
listener - the listener interface to remove

removeMouseListener

@Deprecated
public void removeMouseListener(MouseListener listener)
Deprecated. Use the HandlerRegistration.removeHandler() method on the object returned by an add*Handler method instead

Description copied from interface: SourcesMouseEvents
Removes a previously added listener interface.

Specified by:
removeMouseListener in interface SourcesMouseEvents
Parameters:
listener - the listener interface to remove

removeTreeListener

@Deprecated
public void removeTreeListener(TreeListener listener)
Deprecated. Use the HandlerRegistration.removeHandler() method on the object returned by an add*Handler method instead

Description copied from interface: SourcesTreeEvents
Removes a previously added listener interface.

Specified by:
removeTreeListener in interface SourcesTreeEvents
Parameters:
listener - the listener interface to remove

setAccessKey

public void setAccessKey(char key)
Description copied from interface: Focusable
Sets the widget's 'access key'. This key is used (in conjunction with a browser-specific modifier key) to automatically focus the widget.

Specified by:
setAccessKey in interface Focusable
Parameters:
key - the widget's access key

setAnimationEnabled

public void setAnimationEnabled(boolean enable)
Description copied from interface: HasAnimation
Enable or disable animations.

Specified by:
setAnimationEnabled in interface HasAnimation
Parameters:
enable - true to enable, false to disable

setFocus

public void setFocus(boolean focus)
Description copied from interface: Focusable
Explicitly focus/unfocus this widget. Only one widget can have focus at a time, and the widget that does will receive all keyboard events.

Specified by:
setFocus in interface Focusable
Parameters:
focus - whether this widget should take focus or release it

setSelectedItem

public void setSelectedItem(TreeItem item)
Selects a specified item.

Parameters:
item - the item to be selected, or null to deselect all items

setSelectedItem

public void setSelectedItem(TreeItem item,
                            boolean fireEvents)
Selects a specified item.

Parameters:
item - the item to be selected, or null to deselect all items
fireEvents - true to allow selection events to be fired

setTabIndex

public void setTabIndex(int index)
Description copied from interface: Focusable
Sets the widget's position in the tab index. If more than one widget has the same tab index, each such widget will receive focus in an arbitrary order. Setting the tab index to -1 will cause this widget to be removed from the tab order.

Specified by:
setTabIndex in interface Focusable
Parameters:
index - the widget's tab index

treeItemIterator

public java.util.Iterator<TreeItem> treeItemIterator()
Iterator of tree items.

Returns:
the iterator

doAttachChildren

protected void doAttachChildren()
Description copied from class: Widget
If a widget contains one or more child widgets that are not in the logical widget hierarchy (the child is physically connected only on the DOM level), it must override this method and call Widget.onAttach() for each of its child widgets.

Overrides:
doAttachChildren in class Widget
See Also:
Widget.onAttach()

doDetachChildren

protected void doDetachChildren()
Description copied from class: Widget
If a widget contains one or more child widgets that are not in the logical widget hierarchy (the child is physically connected only on the DOM level), it must override this method and call Widget.onDetach() for each of its child widgets.

Overrides:
doDetachChildren in class Widget
See Also:
Widget.onDetach()

isKeyboardNavigationEnabled

protected boolean isKeyboardNavigationEnabled(TreeItem currentItem)
Indicates if keyboard navigation is enabled for the Tree and for a given TreeItem. Subclasses of Tree can override this function to selectively enable or disable keyboard navigation.

Parameters:
currentItem - the currently selected TreeItem
Returns:
true if the Tree will response to arrow keys by changing the currently selected item

onEnsureDebugId

protected void onEnsureDebugId(java.lang.String baseID)
Affected Elements:

Overrides:
onEnsureDebugId in class UIObject
Parameters:
baseID - the base ID used by the main element
See Also:
UIObject.onEnsureDebugId(String)

onLoad

protected void onLoad()
Description copied from class: Widget
This method is called immediately after a widget becomes attached to the browser's document.

Overrides:
onLoad in class Widget
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