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

All Implemented Interfaces:

IInputProvider, IInputSelectionProvider, IPostSelectionProvider, ISelectionProvider

Direct Known Subclasses:

CheckboxTreeViewer, CommonViewer, 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).

As of 3.2, TreeViewer supports multiple equal elements (each with a different parent chain) in the tree. This support requires that clients enable the element map by calling setUseHashlookup(true).

Content providers for tree viewers must implement either the ITreeContentProvider interface, (as of 3.2) the ILazyTreeContentProvider interface, or (as of 3.3) the ILazyTreePathContentProvider. If the content provider is an ILazyTreeContentProvider or an ILazyTreePathContentProvider, the underlying Tree must be created using the SWT.VIRTUAL style bit, the tree viewer will not support sorting or filtering, and hash lookup must be enabled by calling StructuredViewer.setUseHashlookup(boolean).

Users setting up an editable tree with more than 1 column have to pass the SWT.FULL_SELECTION style bit

Restriction:

This class is not intended to be subclassed by clients.

Nested Class Summary
- Nested classes/interfaces inherited from class org.eclipse.jface.viewers.StructuredViewer
  StructuredViewer.ColorAndFontCollector, StructuredViewer.ColorAndFontCollectorWithProviders

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

Constructors
Constructor	Description
`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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`addTreeListener(Control c, TreeListener listener)`	Adds the given SWT tree listener to the given SWT control.
`protected void`	`assertContentProviderType(IContentProvider provider)`	Assert that the content provider is of one of the supported types.
`protected ColumnViewerEditor`	`createViewerEditor()`	This implementation of `AbstractTreeViewer.createViewerEditor()` returns null to ensure API backwards compatibility.
`protected void`	`disassociate(Item item)`	The `AbstractTreeViewer` implementation of this method also recurses over children of the corresponding element.
`protected int`	`doGetColumnCount()`	Returns the number of columns of this viewer.
`void`	`editElement(Object element, int column)`	Starts editing the given element at the given column index.
`protected Item`	`getChild(Widget widget, int index)`	Get the child for the widget at index.
`protected Item[]`	`getChildren(Widget o)`	Returns the SWT child items for the given SWT widget.
`protected Widget`	`getColumnViewerOwner(int columnIndex)`	Returns the column widget at the given column index.
`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`	`getItemAt(Point p)`	This implementation of `AbstractTreeViewer.getItemAt(Point)` returns null to ensure API backwards compatibility.
`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 ensures that the given label provider is an instance of either `ITableLabelProvider` or `ILabelProvider`.
`protected Object`	`getParentElement(Object element)`	This method takes a tree path or an element.
`protected Item`	`getParentItem(Item item)`	Returns the parent item of the given item in the tree, or `null` if there is no parent item.
`protected Object[]`	`getRawChildren(Object parent)`	Returns the children of the given parent without sorting and filtering them.
`protected Item[]`	`getSelection(Control widget)`	Returns all selected items for the given SWT control.
`Tree`	`getTree()`	Returns this tree viewer's tree control.
`protected ViewerRow`	`getViewerRowFromItem(Widget item)`	Returns a `ViewerRow` associated with the given row widget.
`protected void`	`handleTreeCollapse(TreeEvent event)`	Handles a tree collapse event from the SWT widget.
`protected void`	`handleTreeExpand(TreeEvent event)`	Handles a tree expand event from the SWT widget.
`protected void`	`hookControl(Control control)`	Adds event listener hooks to the given control.
`protected void`	`internalAdd(Widget widget, Object parentElement, Object[] childElements)`	Adds the given child elements to this viewer as children of the given parent element.
`protected void`	`internalInitializeTree(Control widget)`	Initializes the tree with root items, expanding to the appropriate level if necessary.
`protected void`	`internalRefreshStruct(Widget widget, Object element, boolean updateLabels)`
`boolean`	`isExpandable(Object element)`	Return whether the tree node representing the given element or path can be expanded.
`protected void`	`mapElement(Object element, Widget item)`	Adds the element item pair to the element map.
`protected Item`	`newItem(Widget parent, int flags, int ix)`	Creates a new item.
`void`	`remove(Object parentOrTreePath, int index)`	Removes the element at the specified index of the parent.
`protected void`	`removeAll(Control widget)`	Removes all items from the given control.
`void`	`replace(Object parentElementOrTreePath, int index, Object element)`	For a TreeViewer with a tree with the VIRTUAL style bit set, replace the given parent's child at index with the given element.
`void`	`setChildCount(Object elementOrTreePath, int count)`	For a TreeViewer with a tree with the VIRTUAL style bit set, set the number of children of the given element or tree path.
`void`	`setContentProvider(IContentProvider provider)`	Sets the content provider used by this `TreeViewer`.
`protected void`	`setExpanded(Item node, boolean expand)`	Sets the expand state of the given item.
`void`	`setHasChildren(Object elementOrTreePath, boolean hasChildren)`	For a TreeViewer with a tree with the VIRTUAL style bit set, inform the viewer about whether the given element or tree path has children.
`protected void`	`setSelection(List<Item> items)`	Sets the selection to the given list of items.
`void`	`setSelection(ISelection selection, boolean reveal)`	Sets a new selection for this viewer and optionally makes it visible.
`protected void`	`showItem(Item item)`	Shows the given item.
`protected void`	`updatePlus(Item item, Object element)`	Updates the "+"/"-" icon of the tree node from the given element.

Methods inherited from class org.eclipse.jface.viewers.AbstractTreeViewer
add, add, addSelectionListener, addTreeListener, associate, buildLabel, collapseAll, collapseToLevel, createChildren, createTreeItem, doFindInputItem, doFindItem, doUpdateItem, doUpdateItem, expandAll, expandAll, expandToLevel, expandToLevel, expandToLevel, expandToLevel, fireTreeCollapsed, fireTreeExpanded, getAutoExpandLevel, getChildren, getExpandedElements, getExpandedState, getExpandedTreePaths, getNextItem, getPreviousItem, getSelection, getSelectionFromWidget, getSortedChildren, getStructuredSelection, getTreePathFromItem, getVisibleExpandedElements, handleDoubleSelect, indexForElement, inputChanged, insert, internalCollapseToLevel, internalExpand, internalExpandToLevel, internalFindItems, internalGetWidgetToSelect, internalIsInputOrEmptyPath, internalRefresh, internalRefresh, internalRefresh, internalRemove, internalRemove, isSameSelection, labelProviderChanged, remove, remove, remove, removeTreeListener, reveal, scrollDown, scrollUp, setAutoExpandLevel, setExpandedElements, setExpandedState, setExpandedTreePaths, setExpandPreCheckFilters, setSelectionToWidget, setSelectionToWidget, updateChildren

Methods inherited from class org.eclipse.jface.viewers.ColumnViewer
applyEditorValue, cancelEditing, checkBusy, getCell, getCellEditors, getCellModifier, getColumnProperties, getColumnViewerEditor, getItem, getLabelProvider, getViewerRow, handleDispose, hookEditingSupport, isBusy, isCellEditorActive, refresh, refresh, setBusy, setCellEditors, setCellModifier, setColumnProperties, setColumnViewerEditor, setLabelProvider, triggerEditorActivationEvent, update

Methods inherited from class org.eclipse.jface.viewers.StructuredViewer
addDoubleClickListener, addDragSupport, addDropSupport, addFilter, addOpenListener, addPostSelectionChangedListener, assertElementsNotNull, equals, filter, findItem, findItems, fireDoubleClick, fireOpen, firePostSelectionChanged, getColorAndFontCollector, getComparator, getComparer, getFilteredChildren, getFilters, getRoot, getSorter, handleInvalidSelection, handleLabelProviderChanged, handleOpen, handlePostSelect, handleSelect, hasFilters, internalUpdate, needsRefilter, preservingSelection, refresh, refresh, refreshItem, removeDoubleClickListener, removeFilter, removeOpenListener, removePostSelectionChangedListener, resetFilters, setComparator, setComparer, setFilters, setInput, setSorter, setUseHashlookup, testFindItem, testFindItems, unmapAllElements, unmapElement, unmapElement, update, updateItem, updateSelection, usingElementMap

Methods inherited from class org.eclipse.jface.viewers.ContentViewer
getContentProvider, getInput

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
  - getColumnViewerOwner
```
protected Widget getColumnViewerOwner(int columnIndex)
```
    Description copied from class: ColumnViewer
    
    Returns the column widget at the given column index.
    
    Overrides:
    
    getColumnViewerOwner in class AbstractTreeViewer
    
    Parameters:
    
    columnIndex - the column index
    
    Returns:
    
    Widget the column widget
  - 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
  - getItemAt
```
protected Item getItemAt(Point p)
```
    Description copied from class: AbstractTreeViewer
    
    This implementation of AbstractTreeViewer.getItemAt(Point) returns null to ensure API backwards compatibility. Subclasses should override.
    
    Overrides:
    
    getItemAt in class AbstractTreeViewer
    
    Parameters:
    
    p - the widget-relative coordinates
    
    Returns:
    
    the Item at the coordinates 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 ensures that the given label provider is an instance of either ITableLabelProvider or ILabelProvider. If it is an ITableLabelProvider, then it provides a separate label text and image for each column. If it is an ILabelProvider, then it provides only the label text and image for the first column, and any remaining columns are blank.
    
    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 no 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
  - hookControl
```
protected void hookControl(Control control)
```
    Description copied from class: ContentViewer
    
    Adds event listener hooks to the given control.
    All subclasses must call this method when their control is first established.
    
    The ContentViewer implementation of this method hooks dispose events for the given control. Subclasses may override if they need to add other control hooks; however, super.hookControl must be invoked.
    
    Overrides:
    
    hookControl in class AbstractTreeViewer
    
    Parameters:
    
    control - the control
  - createViewerEditor
```
protected ColumnViewerEditor createViewerEditor()
```
    Description copied from class: AbstractTreeViewer
    
    This implementation of AbstractTreeViewer.createViewerEditor() returns null to ensure API backwards compatibility. Subclasses should override.
    
    Overrides:
    
    createViewerEditor in class AbstractTreeViewer
    
    Returns:
    
    the editor, or null if this viewer does not support editing cell contents.
  - 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
  - setSelection
```
protected void setSelection(List<Item> 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
  - getChild
```
protected Item getChild(Widget widget,
                        int index)
```
    Description copied from class: AbstractTreeViewer
    
    Get the child for the widget at index. Note that the default implementation is not very efficient and should be overridden if this class is implemented.
    
    Overrides:
    
    getChild in class AbstractTreeViewer
    
    Parameters:
    
    widget - the widget to check
    
    index - the index of the widget
    
    Returns:
    
    Item or null if widget is not a type that can contain items.
  - assertContentProviderType
```
protected void assertContentProviderType(IContentProvider provider)
```
    Description copied from class: StructuredViewer
    
    Assert that the content provider is of one of the supported types.
    
    Overrides:
    
    assertContentProviderType in class AbstractTreeViewer
    
    Parameters:
    
    provider - content provider to check
  - getRawChildren
```
protected Object[] getRawChildren(Object parent)
```
    Description copied from class: StructuredViewer
    
    Returns the children of the given parent without sorting and filtering them. The resulting array must not be modified, as it may come directly from the model's internal state.
    Returns an empty array if the given parent is null.
    
    Overrides:
    
    getRawChildren in class AbstractTreeViewer
    
    Parameters:
    
    parent - the parent element
    
    Returns:
    
    the child elements
  - setChildCount
```
public void setChildCount(Object elementOrTreePath,
                          int count)
```
    For a TreeViewer with a tree with the VIRTUAL style bit set, set the number of children of the given element or tree path. To set the number of children of the invisible root of the tree, you can pass the input object or an empty tree path.
    
    Parameters:
    
    elementOrTreePath - the element, or tree path
    
    count - new number of children
    
    Since:
    
    3.2
  - replace
```
public void replace(Object parentElementOrTreePath,
                    int index,
                    Object element)
```
    For a TreeViewer with a tree with the VIRTUAL style bit set, replace the given parent's child at index with the given element. If the given parent is this viewer's input or an empty tree path, this will replace the root element at the given index.
    This method should be called by implementers of ILazyTreeContentProvider to populate this viewer.
    
    Parameters:
    
    parentElementOrTreePath - the parent of the element that should be updated, or the tree path to that parent
    
    index - the index in the parent's children
    
    element - the new element
    
    Since:
    
    3.2
    
    See Also:
    
    setChildCount(Object, int), ILazyTreeContentProvider, ILazyTreePathContentProvider
  - isExpandable
```
public boolean isExpandable(Object element)
```
    Description copied from class: AbstractTreeViewer
    
    Return whether the tree node representing the given element or path can be expanded. Clients should query expandability by path if the viewer's content provider is an ITreePathContentProvider.
    The default implementation of this framework method calls hasChildren on this viewer's content provider. It may be overridden if necessary.
    
    Overrides:
    
    isExpandable in class AbstractTreeViewer
    
    Parameters:
    
    element - the element or path
    
    Returns:
    
    true if the tree node representing the given element can be expanded, or false if not
    
    See Also:
    
    AbstractTreeViewer.setExpandPreCheckFilters(boolean)
  - getParentElement
```
protected Object getParentElement(Object element)
```
    Description copied from class: AbstractTreeViewer
    
    This method takes a tree path or an element. If the argument is not a tree path, returns the parent of the given element or null if the parent is not known. If the argument is a tree path with more than one segment, returns its parent tree path, otherwise returns null.
    
    Overrides:
    
    getParentElement in class AbstractTreeViewer
    
    Parameters:
    
    element - the element or path to find parent for
    
    Returns:
    
    the parent element, or parent path, or null
  - internalAdd
```
protected void internalAdd(Widget widget,
                           Object parentElement,
                           Object[] childElements)
```
    Description copied from class: AbstractTreeViewer
    
    Adds the given child elements to this viewer as children of the given parent element.
    EXPERIMENTAL. Not to be used except by JDT. This method was added to support JDT's explorations into grouping by working sets. This method cannot be removed without breaking binary backwards compatibility, but should not be called by clients.
    
    Overrides:
    
    internalAdd in class AbstractTreeViewer
    
    Parameters:
    
    widget - the widget for the parent element
    
    parentElement - the parent element
    
    childElements - the child elements to add
  - internalRefreshStruct
```
protected void internalRefreshStruct(Widget widget,
                                     Object element,
                                     boolean updateLabels)
```
  - mapElement
```
protected void mapElement(Object element,
                          Widget item)
```
    Description copied from class: StructuredViewer
    
    Adds the element item pair to the element map.
    This method is internal to the framework; subclassers should not call this method.
    
    Overrides:
    
    mapElement in class StructuredViewer
    
    Parameters:
    
    element - the element
    
    item - the corresponding widget
  - getViewerRowFromItem
```
protected ViewerRow getViewerRowFromItem(Widget item)
```
    Description copied from class: ColumnViewer
    
    Returns a ViewerRow associated with the given row widget. Implementations may re-use the same instance for different row widgets; callers can only use the viewer row locally and until the next call to this method.
    
    Overrides:
    
    getViewerRowFromItem in class AbstractTreeViewer
    
    Parameters:
    
    item - the row widget
    
    Returns:
    
    ViewerRow a viewer row object
  - internalInitializeTree
```
protected void internalInitializeTree(Control widget)
```
    Description copied from class: AbstractTreeViewer
    
    Initializes the tree with root items, expanding to the appropriate level if necessary.
    
    Overrides:
    
    internalInitializeTree in class AbstractTreeViewer
    
    Parameters:
    
    widget - the tree control
  - updatePlus
```
protected void updatePlus(Item item,
                          Object element)
```
    Description copied from class: AbstractTreeViewer
    
    Updates the "+"/"-" icon of the tree node from the given element. It calls isExpandable to determine whether an element is expandable.
    
    Overrides:
    
    updatePlus in class AbstractTreeViewer
    
    Parameters:
    
    item - the item
    
    element - the element
  - remove
```
public void remove(Object parentOrTreePath,
                   int index)
```
    Removes the element at the specified index of the parent. The selection is updated if required.
    
    Parameters:
    
    parentOrTreePath - the parent element, the input element, or a tree path to the parent element
    
    index - child index
    
    Since:
    
    3.3
  - handleTreeExpand
```
protected void handleTreeExpand(TreeEvent event)
```
    Description copied from class: AbstractTreeViewer
    
    Handles a tree expand event from the SWT widget.
    
    Overrides:
    
    handleTreeExpand in class AbstractTreeViewer
    
    Parameters:
    
    event - the SWT tree event
  - handleTreeCollapse
```
protected void handleTreeCollapse(TreeEvent event)
```
    Description copied from class: AbstractTreeViewer
    
    Handles a tree collapse event from the SWT widget.
    
    Overrides:
    
    handleTreeCollapse in class AbstractTreeViewer
    
    Parameters:
    
    event - the SWT tree event
  - setContentProvider
```
public void setContentProvider(IContentProvider provider)
```
    Sets the content provider used by this TreeViewer.
    Content providers for tree viewers must implement either ITreeContentProvider, or ITreePathContentProvider, or ILazyTreeContentProvider, or ILazyTreePathContentProvider.
    
    Overrides:
    
    setContentProvider in class AbstractTreeViewer
    
    Parameters:
    
    provider - the content provider
    
    See Also:
    
    ContentViewer.getContentProvider()
  - setHasChildren
```
public void setHasChildren(Object elementOrTreePath,
                           boolean hasChildren)
```
    For a TreeViewer with a tree with the VIRTUAL style bit set, inform the viewer about whether the given element or tree path has children. Avoid calling this method if the number of children has already been set.
    
    Parameters:
    
    elementOrTreePath - the element, or tree path
    
    hasChildren - the new state for the element or tree path
    
    Since:
    
    3.3
  - disassociate
```
protected void disassociate(Item item)
```
    Description copied from class: AbstractTreeViewer
    
    The AbstractTreeViewer implementation of this method also recurses over children of the corresponding element.
    
    Overrides:
    
    disassociate in class AbstractTreeViewer
    
    Parameters:
    
    item - the widget
  - doGetColumnCount
```
protected int doGetColumnCount()
```
    Description copied from class: AbstractTreeViewer
    
    Returns the number of columns of this viewer.
    Subclasses should overwrite this method, which has a default implementation (returning 0) for API backwards compatility reasons
    
    Overrides:
    
    doGetColumnCount in class AbstractTreeViewer
    
    Returns:
    
    the number of columns
  - setSelection
```
public void setSelection(ISelection selection,
                         boolean reveal)
```
    Sets a new selection for this viewer and optionally makes it visible.
    Currently the reveal parameter is not honored because Tree does not provide an API to only select an item without scrolling it into view
    
    Overrides:
    
    setSelection in class StructuredViewer
    
    Parameters:
    
    selection - the new selection
    
    reveal - true if the selection is to be made visible, and false otherwise
  - editElement
```
public void editElement(Object element,
                        int column)
```
    Description copied from class: ColumnViewer
    
    Starts editing the given element at the given column index.
    
    Overrides:
    
    editElement in class ColumnViewer
    
    Parameters:
    
    element - the model element
    
    column - the column index

Class TreeViewer

Nested Class Summary

Nested classes/interfaces inherited from class org.eclipse.jface.viewers.StructuredViewer

Field Summary

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

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

Constructor Summary

Method Summary

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

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

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

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

TreeViewer

TreeViewer

TreeViewer

Method Detail

addTreeListener

getColumnViewerOwner

getChildren

getControl

getExpanded

getItemAt

getItemCount

getItemCount

getItems

getLabelProvider

getParentItem

getSelection

getTree

hookControl

createViewerEditor

newItem

removeAll

setExpanded

setSelection

showItem

getChild

assertContentProviderType

getRawChildren

setChildCount

replace

isExpandable

getParentElement

internalAdd

internalRefreshStruct

mapElement

getViewerRowFromItem

internalInitializeTree

updatePlus

remove

handleTreeExpand

handleTreeCollapse

setContentProvider

setHasChildren

disassociate

doGetColumnCount

setSelection

editElement