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Eclipse Platform
Release 3.0

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org.eclipse.jface.viewers
Class CheckboxTreeViewer

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
                      org.eclipse.jface.viewers.CheckboxTreeViewer

All Implemented Interfaces:

ICheckable, IInputProvider, IInputSelectionProvider, IPostSelectionProvider, ISelectionProvider

public class CheckboxTreeViewer

extends TreeViewer

implements ICheckable

A concrete tree-structured viewer based on an SWT Tree control with checkboxes on each node.

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).

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

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

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

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

Method Summary

void	addCheckStateListener(ICheckStateListener listener) Adds a listener for changes to the checked state of elements in this viewer.
protected void	fireCheckStateChanged(CheckStateChangedEvent event) Notifies any check state listeners that the check state of an element has changed.
boolean	getChecked(Object element) Returns the checked state of the given element.
Object[]	getCheckedElements() Returns a list of checked elements in this viewer's tree, including currently hidden ones that are marked as checked but are under a collapsed ancestor.
boolean	getGrayed(Object element) Returns the grayed state of the given element.
Object[]	getGrayedElements() Returns a list of grayed elements in this viewer's tree, including currently hidden ones that are marked as grayed but are under a collapsed ancestor.
protected void	handleDoubleSelect(SelectionEvent event) Handles a double-click select event from the widget.
protected void	handleSelect(SelectionEvent event) Handles a select event from the widget.
protected void	preservingSelection(Runnable updateCode) Attempts to preserves the current selection across a run of the given code.
void	removeCheckStateListener(ICheckStateListener listener) Removes the given check state listener from this viewer.
boolean	setChecked(Object element, boolean state) Sets the checked state for the given element in this viewer.
void	setCheckedElements(Object[] elements) Sets which elements are checked in this viewer's tree.
boolean	setGrayChecked(Object element, boolean state) Check and gray the selection rather than calling both setGrayed and setChecked as an optimization.
boolean	setGrayed(Object element, boolean state) Sets the grayed state for the given element in this viewer.
void	setGrayedElements(Object[] elements) Sets which elements are grayed in this viewer's tree.
boolean	setParentsGrayed(Object element, boolean state) Sets the grayed state for the given element and its parents in this viewer.
boolean	setSubtreeChecked(Object element, boolean state) Sets the checked state for the given element and its visible children in this viewer.

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

addTreeListener, doUpdateItem, getChildren, getControl, getExpanded, getItem, getItemCount, getItemCount, getItems, getLabelProvider, getParentItem, getSelection, getTree, newItem, removeAll, setExpanded, setLabelProvider, setSelection, showItem

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, handleInvalidSelection, handleLabelProviderChanged, handleOpen, handlePostSelect, hasFilters, mapElement, needsRefilter, 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

CheckboxTreeViewer

public CheckboxTreeViewer(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: CHECK and BORDER. The viewer has no input, no content provider, a default label provider, no sorter, and no filters.

Parameters:

parent - the parent control

CheckboxTreeViewer

public CheckboxTreeViewer(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, plus the CHECK style bit. 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

CheckboxTreeViewer

public CheckboxTreeViewer(Tree tree)

Creates a tree viewer on the given tree control. The SWT.CHECK style bit must be set 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

addCheckStateListener

public void addCheckStateListener(ICheckStateListener listener)

Description copied from interface: ICheckable

Adds a listener for changes to the checked state of elements in this viewer. Has no effect if an identical listener is already registered.

Specified by:

addCheckStateListener in interface ICheckable

Parameters:

listener - a check state listener

fireCheckStateChanged

protected void fireCheckStateChanged(CheckStateChangedEvent event)

Notifies any check state listeners that the check state of an element has changed. Only listeners registered at the time this method is called are notified.

Parameters:

event - a check state changed event

See Also:

ICheckStateListener.checkStateChanged(org.eclipse.jface.viewers.CheckStateChangedEvent)

getChecked

public boolean getChecked(Object element)

Description copied from interface: ICheckable

Returns the checked state of the given element.

Specified by:

getChecked in interface ICheckable

Parameters:

element - the element

Returns:

true if the element is checked, and false if not checked

getCheckedElements

public Object[] getCheckedElements()

Returns a list of checked elements in this viewer's tree, including currently hidden ones that are marked as checked but are under a collapsed ancestor.

This method is typically used when preserving the interesting state of a viewer; setCheckedElements is used during the restore.

Returns:

the array of checked elements

See Also:

setCheckedElements(java.lang.Object[])

getGrayed

public boolean getGrayed(Object element)

Returns the grayed state of the given element.

Parameters:

element - the element

Returns:

true if the element is grayed, and false if not grayed

getGrayedElements

public Object[] getGrayedElements()

Returns a list of grayed elements in this viewer's tree, including currently hidden ones that are marked as grayed but are under a collapsed ancestor.

This method is typically used when preserving the interesting state of a viewer; setGrayedElements is used during the restore.

Returns:

the array of grayed elements

See Also:

setGrayedElements(java.lang.Object[])

handleDoubleSelect

protected void handleDoubleSelect(SelectionEvent event)

Description copied from class: StructuredViewer

Handles a double-click select event from the widget.

This method is internal to the framework; subclassers should not call this method.

Overrides:

handleDoubleSelect in class StructuredViewer

Parameters:

event - the SWT selection event

handleSelect

protected void handleSelect(SelectionEvent event)

Description copied from class: StructuredViewer

Handles a select event from the widget.

This method is internal to the framework; subclassers should not call this method.

Overrides:

handleSelect in class StructuredViewer

Parameters:

event - the SWT selection event

preservingSelection

protected void preservingSelection(Runnable updateCode)

Description copied from class: StructuredViewer

Attempts to preserves the current selection across a run of the given code.

The default implementation of this method:

• discovers the old selection (via getSelection)
• runs the given runnable
• attempts to restore the old selection (using setSelectionToWidget
• rediscovers the resulting selection (via getSelection)
• calls handleInvalidSelection if the selection did not take
• calls postUpdateHook

Overrides:

preservingSelection in class StructuredViewer

Parameters:

updateCode - the code to run

removeCheckStateListener

public void removeCheckStateListener(ICheckStateListener listener)

Description copied from interface: ICheckable

Removes the given check state listener from this viewer. Has no effect if an identical listener is not registered.

Specified by:

removeCheckStateListener in interface ICheckable

Parameters:

listener - a check state listener

setChecked

public boolean setChecked(Object element,
                          boolean state)

Description copied from interface: ICheckable

Sets the checked state for the given element in this viewer.

Specified by:

setChecked in interface ICheckable

Parameters:

element - the element

state - true if the item should be checked, and false if it should be unchecked

Returns:

true if the checked state could be set, and false otherwise

setCheckedElements

public void setCheckedElements(Object[] elements)

Sets which elements are checked in this viewer's tree. The given list contains the elements that are to be checked; all other elements are to be unchecked.

This method is typically used when restoring the interesting state of a viewer captured by an earlier call to getCheckedElements.

Parameters:

elements - the array of checked elements

See Also:

getCheckedElements()

setGrayed

public boolean setGrayed(Object element,
                         boolean state)

Sets the grayed state for the given element in this viewer.

Parameters:

element - the element

state - true if the item should be grayed, and false if it should be ungrayed

Returns:

true if the gray state could be set, and false otherwise

setGrayChecked

public boolean setGrayChecked(Object element,
                              boolean state)

Check and gray the selection rather than calling both setGrayed and setChecked as an optimization.

Parameters:

element - the item being checked

state - a boolean indicating selection or deselection

Returns:

boolean indicating success or failure.

setGrayedElements

public void setGrayedElements(Object[] elements)

Sets which elements are grayed in this viewer's tree. The given list contains the elements that are to be grayed; all other elements are to be ungrayed.

This method is typically used when restoring the interesting state of a viewer captured by an earlier call to getGrayedElements.

Parameters:

elements - the array of grayed elements

See Also:

getGrayedElements()

setParentsGrayed

public boolean setParentsGrayed(Object element,
                                boolean state)

Sets the grayed state for the given element and its parents in this viewer.

Parameters:

element - the element

state - true if the item should be grayed, and false if it should be ungrayed

Returns:

true if the element is visible and the gray state could be set, and false otherwise

See Also:

setGrayed(java.lang.Object, boolean)

setSubtreeChecked

public boolean setSubtreeChecked(Object element,
                                 boolean state)

Sets the checked state for the given element and its visible children in this viewer. Assumes that the element has been expanded before. To enforce that the item is expanded, call expandToLevel for the element.

Parameters:

element - the element

state - true if the item should be checked, and false if it should be unchecked

Returns:

true if the checked state could be set, and false otherwise