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Eclipse Platform
Release 3.0

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org.eclipse.jface.viewers
Class TreeViewer

java.lang.Object
  org.eclipse.jface.viewers.Viewer
      org.eclipse.jface.viewers.ContentViewer
          org.eclipse.jface.viewers.StructuredViewer
              org.eclipse.jface.viewers.AbstractTreeViewer
                  org.eclipse.jface.viewers.TreeViewer

All Implemented Interfaces:

IInputProvider, IInputSelectionProvider, IPostSelectionProvider, ISelectionProvider

Direct Known Subclasses:

CheckboxTreeViewer, DiffTreeViewer

public class TreeViewer

extends AbstractTreeViewer

A concrete viewer based on an SWT Tree control.

This class is not intended to be subclassed outside the viewer framework. It is designed to be instantiated with a pre-existing SWT tree control and configured with a domain-specific content provider, label provider, element filter (optional), and element sorter (optional).

Content providers for tree viewers must implement the ITreeContentProvider interface.

Field Summary

Fields inherited from class org.eclipse.jface.viewers.AbstractTreeViewer

ALL_LEVELS

Fields inherited from class org.eclipse.jface.viewers.Viewer

WIDGET_DATA_KEY

Constructor Summary

TreeViewer(Composite parent)
Creates a tree viewer on a newly-created tree control under the given parent.

TreeViewer(Composite parent, int style)
Creates a tree viewer on a newly-created tree control under the given parent.

TreeViewer(Tree tree)
Creates a tree viewer on the given tree control.

Method Summary

protected void	addTreeListener(Control c, TreeListener listener) Adds the given SWT tree listener to the given SWT control.
protected void	doUpdateItem(Item item, Object element) Copies the attributes of the given element into the given SWT item.
protected Item[]	getChildren(Widget o) Returns the SWT child items for the given SWT widget.
Control	getControl() Returns the primary control associated with this viewer.
protected boolean	getExpanded(Item item) Returns whether the given SWT item is expanded or collapsed.
protected Item	getItem(int x, int y) Returns the item at the given display-relative coordinates, or null if there is no item at that location.
protected int	getItemCount(Control widget) Returns the number of child items of the given SWT control.
protected int	getItemCount(Item item) Returns the number of child items of the given SWT item.
protected Item[]	getItems(Item item) Returns the child items of the given SWT item.
IBaseLabelProvider	getLabelProvider() The tree viewer implementation of this Viewer framework method returns the label provider, which in the case of tree viewers will be an instance of ILabelProvider.
protected Item	getParentItem(Item item) Returns the parent item of the given item in the tree, or null if there is parent item.
protected Item[]	getSelection(Control widget) Returns all selected items for the given SWT control.
Tree	getTree() Returns this tree viewer's tree control.
protected Item	newItem(Widget parent, int flags, int ix) Creates a new item.
protected void	removeAll(Control widget) Removes all items from the given control.
protected void	setExpanded(Item node, boolean expand) Sets the expand state of the given item.
void	setLabelProvider(IBaseLabelProvider labelProvider) The tree viewer implementation of this Viewer framework method ensures that the given label provider is an instance of ILabelProvider.
protected void	setSelection(List items) Sets the selection to the given list of items.
protected void	showItem(Item item) Shows the given item.

Methods inherited from class org.eclipse.jface.viewers.AbstractTreeViewer

add, add, addSelectionListener, addTreeListener, associate, collapseAll, collapseToLevel, createChildren, createTreeItem, disassociate, doFindInputItem, doFindItem, doUpdateItem, expandAll, expandToLevel, expandToLevel, fireTreeCollapsed, fireTreeExpanded, getAutoExpandLevel, getExpandedElements, getExpandedState, getNextItem, getPreviousItem, getRawChildren, getSelectionFromWidget, getVisibleExpandedElements, handleTreeCollapse, handleTreeExpand, hookControl, indexForElement, inputChanged, internalCollapseToLevel, internalExpand, internalExpandToLevel, internalRefresh, internalRefresh, isExpandable, labelProviderChanged, remove, remove, removeTreeListener, reveal, scrollDown, scrollUp, setAutoExpandLevel, setContentProvider, setExpandedElements, setExpandedState, setSelectionToWidget, updateChildren, updatePlus

Methods inherited from class org.eclipse.jface.viewers.StructuredViewer

addDoubleClickListener, addDragSupport, addDropSupport, addFilter, addOpenListener, addPostSelectionChangedListener, assertElementsNotNull, equals, filter, findItem, fireDoubleClick, fireOpen, firePostSelectionChanged, getComparer, getFilteredChildren, getFilters, getRoot, getSelection, getSortedChildren, getSorter, handleDoubleSelect, handleInvalidSelection, handleLabelProviderChanged, handleOpen, handlePostSelect, handleSelect, hasFilters, mapElement, needsRefilter, preservingSelection, refresh, refresh, refresh, refresh, refreshItem, removeDoubleClickListener, removeFilter, removeOpenListener, removePostSelectionChangedListener, resetFilters, setComparer, setInput, setSelection, setSelectionToWidget, setSorter, setUseHashlookup, testFindItem, unmapAllElements, unmapElement, unmapElement, update, update, updateItem, updateSelection, usingElementMap

Methods inherited from class org.eclipse.jface.viewers.ContentViewer

getContentProvider, getInput, handleDispose

Methods inherited from class org.eclipse.jface.viewers.Viewer

addHelpListener, addSelectionChangedListener, fireHelpRequested, fireSelectionChanged, getData, handleHelpRequest, removeHelpListener, removeSelectionChangedListener, setData, setSelection

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.eclipse.jface.viewers.ISelectionProvider

addSelectionChangedListener, removeSelectionChangedListener, setSelection

Constructor Detail

TreeViewer

public TreeViewer(Composite parent)

Creates a tree viewer on a newly-created tree control under the given parent. The tree control is created using the SWT style bits MULTI, H_SCROLL, V_SCROLL, and BORDER. The viewer has no input, no content provider, a default label provider, no sorter, and no filters.

Parameters:

parent - the parent control

TreeViewer

public TreeViewer(Composite parent,
                  int style)

Creates a tree viewer on a newly-created tree control under the given parent. The tree control is created using the given SWT style bits. The viewer has no input, no content provider, a default label provider, no sorter, and no filters.

Parameters:

parent - the parent control

style - the SWT style bits used to create the tree.

TreeViewer

public TreeViewer(Tree tree)

Creates a tree viewer on the given tree control. The viewer has no input, no content provider, a default label provider, no sorter, and no filters.

Parameters:

tree - the tree control

Method Detail

addTreeListener

protected void addTreeListener(Control c,
                               TreeListener listener)

Description copied from class: AbstractTreeViewer

Adds the given SWT tree listener to the given SWT control.

Specified by:

addTreeListener in class AbstractTreeViewer

Parameters:

c - the SWT control

listener - the SWT tree listener

doUpdateItem

protected void doUpdateItem(Item item,
                            Object element)

Description copied from class: AbstractTreeViewer

Copies the attributes of the given element into the given SWT item.

Specified by:

doUpdateItem in class AbstractTreeViewer

Parameters:

item - the SWT item

element - the element

getChildren

protected Item[] getChildren(Widget o)

Description copied from class: AbstractTreeViewer

Returns the SWT child items for the given SWT widget.

Specified by:

getChildren in class AbstractTreeViewer

Parameters:

o - the widget

Returns:

the child items

getControl

public Control getControl()

Description copied from class: Viewer

Returns the primary control associated with this viewer.

Specified by:

getControl in class Viewer

Returns:

the SWT control which displays this viewer's content

getExpanded

protected boolean getExpanded(Item item)

Description copied from class: AbstractTreeViewer

Returns whether the given SWT item is expanded or collapsed.

Specified by:

getExpanded in class AbstractTreeViewer

Parameters:

item - the item

Returns:

true if the item is considered expanded and false if collapsed

getItem

protected Item getItem(int x,
                       int y)

Description copied from class: StructuredViewer

Returns the item at the given display-relative coordinates, or null if there is no item at that location.

The default implementation of this method returns null.

Overrides:

getItem in class StructuredViewer

Parameters:

x - horizontal coordinate

y - vertical coordinate

Returns:

the item, or null if there is no item at the given coordinates

getItemCount

protected int getItemCount(Control widget)

Description copied from class: AbstractTreeViewer

Returns the number of child items of the given SWT control.

Specified by:

getItemCount in class AbstractTreeViewer

Parameters:

widget - the control

Returns:

the number of children

getItemCount

protected int getItemCount(Item item)

Description copied from class: AbstractTreeViewer

Returns the number of child items of the given SWT item.

Specified by:

getItemCount in class AbstractTreeViewer

Parameters:

item - the item

Returns:

the number of children

getItems

protected Item[] getItems(Item item)

Description copied from class: AbstractTreeViewer

Returns the child items of the given SWT item.

Specified by:

getItems in class AbstractTreeViewer

Parameters:

item - the item

Returns:

the child items

getLabelProvider

public IBaseLabelProvider getLabelProvider()

The tree viewer implementation of this Viewer framework method returns the label provider, which in the case of tree viewers will be an instance of ILabelProvider.

Overrides:

getLabelProvider in class ContentViewer

Returns:

a label provider

getParentItem

protected Item getParentItem(Item item)

Description copied from class: AbstractTreeViewer

Returns the parent item of the given item in the tree, or null if there is parent item.

Specified by:

getParentItem in class AbstractTreeViewer

Parameters:

item - the item

Returns:

the parent item, or null if none

getSelection

protected Item[] getSelection(Control widget)

Description copied from class: AbstractTreeViewer

Returns all selected items for the given SWT control.

Specified by:

getSelection in class AbstractTreeViewer

Parameters:

widget - the control

Returns:

the list of selected items

getTree

public Tree getTree()

Returns this tree viewer's tree control.

Returns:

the tree control

newItem

protected Item newItem(Widget parent,
                       int flags,
                       int ix)

Description copied from class: AbstractTreeViewer

Creates a new item.

Specified by:

newItem in class AbstractTreeViewer

Parameters:

parent - the parent widget

flags - SWT style bits

ix - if non-negative, indicates the position to insert the item into its parent

Returns:

the newly-created item

removeAll

protected void removeAll(Control widget)

Description copied from class: AbstractTreeViewer

Removes all items from the given control.

Specified by:

removeAll in class AbstractTreeViewer

Parameters:

widget - the control

setExpanded

protected void setExpanded(Item node,
                           boolean expand)

Description copied from class: AbstractTreeViewer

Sets the expand state of the given item.

Specified by:

setExpanded in class AbstractTreeViewer

Parameters:

node - the item

expand - the expand state of the item

setLabelProvider

public void setLabelProvider(IBaseLabelProvider labelProvider)

The tree viewer implementation of this Viewer framework method ensures that the given label provider is an instance of ILabelProvider.

Overrides:

setLabelProvider in class ContentViewer

Parameters:

labelProvider - the label provider, or null if none

setSelection

protected void setSelection(List items)

Description copied from class: AbstractTreeViewer

Sets the selection to the given list of items.

Specified by:

setSelection in class AbstractTreeViewer

Parameters:

items - list of items (element type: org.eclipse.swt.widgets.Item)

showItem

protected void showItem(Item item)

Description copied from class: AbstractTreeViewer

Shows the given item.

Specified by:

showItem in class AbstractTreeViewer

Parameters:

item - the item