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Eclipse Rich Ajax Platform
Release 1.2

org.eclipse.swt.widgets
Class Tree

java.lang.Object
  extended by

org.eclipse.swt.widgets.Widget
      extended by

org.eclipse.swt.widgets.Control
          extended by

org.eclipse.swt.widgets.Scrollable
              extended by

org.eclipse.swt.widgets.Composite
                  extended by
org.eclipse.swt.widgets.Tree
All Implemented Interfaces:
Adaptable

public class Tree
extends Composite

Instances of this class provide a selectable user interface object that displays a hierarchy of items and issues notification when an item in the hierarchy is selected.

The item children that may be added to instances of this class must be of type TreeItem.

Style VIRTUAL is used to create a Tree whose TreeItems are to be populated by the client on an on-demand basis instead of up-front. This can provide significant performance improvements for trees that are very large or for which TreeItem population is expensive (for example, retrieving values from an external source).

Here is an example of using a Tree with style VIRTUAL:

  final Tree tree = new Tree(parent, SWT.VIRTUAL | SWT.BORDER);
  tree.setItemCount(20);
  tree.addListener(SWT.SetData, new Listener() {
      public void handleEvent(Event event) {
          TreeItem item = (TreeItem)event.item;
          TreeItem parentItem = item.getParentItem();
          String text = null;
          if (parentItem == null) {
              text = "node " + tree.indexOf(item);
          } else {
              text = parentItem.getText() + " - " + parentItem.indexOf(item);
          }
          item.setText(text);
          System.out.println(text);
          item.setItemCount(10);
      }
  });
 

Note that although this class is a subclass of Composite, it does not make sense to add Control children to it, or set a layout on it.

Styles:
SINGLE, MULTI, CHECK, VIRTUAL
Events:
Selection, DefaultSelection, Collapse, Expand, SetData

Note: Only one of the styles SINGLE and MULTI may be specified.

IMPORTANT: This class is not intended to be subclassed.

Since:
1.0

Constructor Summary
Tree ( Composite parent, int style)
          Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.
 
Method Summary
 void addSelectionListener ( SelectionListener listener)
          Adds the listener to the collection of listeners who will be notified when the receiver's selection changes, by sending it one of the messages defined in the SelectionListener interface.
 void addTreeListener ( TreeListener listener)
          Adds the listener to the collection of listeners who will be notified when an item in the receiver is expanded or collapsed by sending it one of the messages defined in the TreeListener interface.
 void clear (int index, boolean recursive)
          Clears the item at the given zero-relative index in the receiver.
 void clearAll (boolean recursive)
          Clears all the items in the receiver.
  Point computeSize (int wHint, int hHint, boolean changed)
          Returns the preferred size of the receiver.
 void deselectAll ()
          Deselects all selected items in the receiver.
  Object getAdapter ( Class adapter)
          Implementation of the Adaptable interface.
  TreeColumn getColumn (int index)
          Returns the column at the given, zero-relative index in the receiver.
 int getColumnCount ()
          Returns the number of columns contained in the receiver.
 int[] getColumnOrder ()
          Returns an array of zero-relative integers that map the creation order of the receiver's items to the order in which they are currently being displayed.
  TreeColumn[] getColumns ()
          Returns an array of TreeColumns which are the columns in the receiver.
 int getHeaderHeight ()
          Returns the height of the receiver's header
 boolean getHeaderVisible ()
          Returns true if the receiver's header is visible, and false otherwise.
  TreeItem getItem (int index)
          Returns the item at the given, zero-relative index in the receiver.
  TreeItem getItem ( Point point)
          Returns the item at the given point in the receiver or null if no such item exists.
 int getItemCount ()
          Returns the number of items contained in the receiver that are direct item children of the receiver.
  TreeItem[] getItems ()
          Returns a (possibly empty) array of items contained in the receiver that are direct item children of the receiver.
 boolean getLinesVisible ()
          Returns true if the receiver's lines are visible, and false otherwise.
  TreeItem getParentItem ()
          Returns the receiver's parent item, which must be a TreeItem or null when the receiver is a root.
  TreeItem[] getSelection ()
          Returns an array of TreeItems that are currently selected in the receiver.
 int getSelectionCount ()
          Returns the number of selected items contained in the receiver.
  TreeColumn getSortColumn ()
          Returns the column which shows the sort indicator for the receiver.
 int getSortDirection ()
          Returns the direction of the sort indicator for the receiver.
 int indexOf ( TreeColumn column)
          Searches the receiver's list starting at the first column (index 0) until a column is found that is equal to the argument, and returns the index of that column.
 int indexOf ( TreeItem item)
          Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item.
 void removeAll ()
          Removes all of the items from the receiver.
 void removeSelectionListener ( SelectionListener listener)
          Removes the listener from the collection of listeners who will be notified when the receiver's selection changes.
 void removeTreeListener ( TreeListener listener)
          Removes the listener from the collection of listeners who will be notified when items in the receiver are expanded or collapsed.
 void selectAll ()
          Selects all of the items in the receiver.
 void setColumnOrder (int[] order)
          Sets the order that the items in the receiver should be displayed in to the given argument which is described in terms of the zero-relative ordering of when the items were added.
 void setHeaderVisible (boolean value)
          Marks the receiver's header as visible if the argument is true , and marks it invisible otherwise.
 void setItemCount (int itemCount)
          Sets the number of root-level items contained in the receiver.
 void setLinesVisible (boolean value)
          Marks the receiver's lines as visible if the argument is true, and marks it invisible otherwise.
 void setSelection ( TreeItem selection)
          Sets the receiver's selection to the given item.
 void setSelection ( TreeItem[] selection)
          Sets the receiver's selection to be the given array of items.
 void setSortColumn ( TreeColumn column)
          Sets the column used by the sort indicator for the receiver.
 void setSortDirection (int direction)
          Sets the direction of the sort indicator for the receiver.
 void showItem ( TreeItem item)
          Shows the item.
 void showSelection ()
          Shows the selection.
 
Methods inherited from class org.eclipse.swt.widgets. Composite
changed, getBackgroundMode, getChildren, getLayout, getLayoutDeferred, getTabList, isLayoutDeferred, layout, layout, layout, layout, setBackgroundMode, setFocus, setLayout, setTabList
 
Methods inherited from class org.eclipse.swt.widgets. Scrollable
computeTrim, getClientArea
 
Methods inherited from class org.eclipse.swt.widgets. Control
addControlListener, addFocusListener, addKeyListener, addMouseListener, addTraverseListener, computeSize, forceFocus, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getParent, getShell, getSize, getToolTipText, getVisible, isEnabled, isFocusControl, isVisible, moveAbove, moveBelow, pack, pack, redraw, removeControlListener, removeFocusListener, removeKeyListener, removeMouseListener, removeTraverseListener, setBackground, setBackgroundImage, setBounds, setBounds, setCursor, setEnabled, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setRedraw, setSize, setSize, setToolTipText, setVisible, toControl, toControl, toDisplay, toDisplay
 
Methods inherited from class org.eclipse.swt.widgets. Widget
addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getStyle, isDisposed, notifyListeners, removeDisposeListener, removeListener, setData, setData, toString
 
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

Tree

public Tree(
Composite parent,
            int style)
Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

The style value is either one of the style constants defined in class SWT which is applicable to instances of this class, or must be built by bitwise OR'ing together (that is, using the int "|" operator) two or more of those SWT style constants. The class description lists the style constants that are applicable to the class. Style bits are also inherited from superclasses.

Parameters:
parent - a composite control which will be the parent of the new instance (cannot be null)
style - the style of control to construct
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the parent is null
SWTException -
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
  • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
See Also:
SWT.SINGLE, SWT.MULTI, SWT.CHECK, Widget.checkSubclass(), Widget.getStyle()
Method Detail

getAdapter

public 
Object getAdapter(
Class adapter)
Description copied from class: Widget
Implementation of the Adaptable interface.

IMPORTANT: This method is not part of the RWT public API. It is marked public only so that it can be shared within the packages provided by RWT. It should never be accessed from application code.

Specified by:
getAdapter in interface Adaptable
Overrides:
getAdapter in class Composite

setItemCount

public void setItemCount(int itemCount)
Sets the number of root-level items contained in the receiver.

Parameters:
itemCount - the number of items
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getItemCount

public int getItemCount()
Returns the number of items contained in the receiver that are direct item children of the receiver. The number that is returned is the number of roots in the tree.

Returns:
the number of items
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getItems

public 
TreeItem[] getItems()
Returns a (possibly empty) array of items contained in the receiver that are direct item children of the receiver. These are the roots of the tree.

Note: This is not the actual structure used by the receiver to maintain its list of items, so modifying the array will not affect the receiver.

Returns:
the items
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getItem

public 
TreeItem getItem(int index)
Returns the item at the given, zero-relative index in the receiver. Throws an exception if the index is out of range.

Parameters:
index - the index of the item to return
Returns:
the item at the given index
Throws:
IllegalArgumentException -
  • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

indexOf

public int indexOf(
TreeItem item)
Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item. If no item is found, returns -1.

Parameters:
item - the search item
Returns:
the index of the item
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the tool item is null
  • ERROR_INVALID_ARGUMENT - if the tool item has been disposed
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getParentItem

public 
TreeItem getParentItem()
Returns the receiver's parent item, which must be a TreeItem or null when the receiver is a root.

Returns:
the receiver's parent item
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

removeAll

public void removeAll()
Removes all of the items from the receiver.

Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

showItem

public void showItem(
TreeItem item)
Shows the item. If the item is already showing in the receiver, this method simply returns. Otherwise, the items are scrolled and expanded until the item is visible.

Parameters:
item - the item to be shown
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the item is null
  • ERROR_INVALID_ARGUMENT - if the item has been disposed
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
showSelection()

showSelection

public void showSelection()
Shows the selection. If the selection is already showing in the receiver, this method simply returns. Otherwise, the items are scrolled until the selection is visible.

Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
showItem(TreeItem)

getSelection

public 
TreeItem[] getSelection()
Returns an array of TreeItems that are currently selected in the receiver. The order of the items is unspecified. An empty array indicates that no items are selected.

Note: This is not the actual structure used by the receiver to maintain its selection, so modifying the array will not affect the receiver.

Returns:
an array representing the selection
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getSelectionCount

public int getSelectionCount()
Returns the number of selected items contained in the receiver.

Returns:
the number of selected items
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setSelection

public void setSelection(
TreeItem selection)
Sets the receiver's selection to the given item. The current selection is cleared before the new item is selected.

If the item is not in the receiver, then it is ignored.

Parameters:
selection - the item to select
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the item is null
  • ERROR_INVALID_ARGUMENT - if the item has been disposed
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setSelection

public void setSelection(
TreeItem[] selection)
Sets the receiver's selection to be the given array of items. The current selection is cleared before the new items are selected.

Items that are not in the receiver are ignored. If the receiver is single-select and multiple items are specified, then all items are ignored.

Parameters:
selection - the array of items
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the array of items is null
  • ERROR_INVALID_ARGUMENT - if one of the items has been disposed
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
deselectAll()

selectAll

public void selectAll()
Selects all of the items in the receiver.

If the receiver is single-select, do nothing.

Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

deselectAll

public void deselectAll()
Deselects all selected items in the receiver.

Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setLinesVisible

public void setLinesVisible(boolean value)
Marks the receiver's lines as visible if the argument is true, and marks it invisible otherwise.

If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, marking it visible may not actually cause it to be displayed.

Parameters:
value - the new visibility state
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getLinesVisible

public boolean getLinesVisible()
Returns true if the receiver's lines are visible, and false otherwise.

If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, this method may still indicate that it is considered visible even though it may not actually be showing.

Returns:
the visibility state of the lines
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

clear

public void clear(int index,
                  boolean recursive)
Clears the item at the given zero-relative index in the receiver. The text, icon and other attributes of the item are set to the default value. If the tree was created with the SWT.VIRTUAL style, these attributes are requested again as needed.

Parameters:
index - the index of the item to clear
recursive - true if all child items of the indexed item should be cleared recursively, and false otherwise
Throws:
IllegalArgumentException -
  • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
SWT.VIRTUAL, SWT.SetData

getItem

public 
TreeItem getItem(
Point point)
Returns the item at the given point in the receiver or null if no such item exists. The point is in the coordinate system of the receiver.

The item that is returned represents an item that could be selected by the user. For example, if selection only occurs in items in the first column, then null is returned if the point is outside of the item. Note that the SWT.FULL_SELECTION style hint, which specifies the selection policy, determines the extent of the selection.

Parameters:
point - the point used to locate the item
Returns:
the item at the given point, or null if the point is not in a selectable item
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the point is null
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

clearAll

public void clearAll(boolean recursive)
Clears all the items in the receiver. The text, icon and other attributes of the items are set to their default values. If the tree was created with the SWT.VIRTUAL style, these attributes are requested again as needed.

Parameters:
recursive - true if all child items should be cleared recursively, and false otherwise
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
SWT.VIRTUAL, SWT.SetData

getColumnCount

public int getColumnCount()
Returns the number of columns contained in the receiver. If no TreeColumns were created by the programmer, this value is zero, despite the fact that visually, one column of items may be visible. This occurs when the programmer uses the tree like a list, adding items but never creating a column.

Returns:
the number of columns
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getHeaderHeight

public int getHeaderHeight()
Returns the height of the receiver's header

Returns:
the height of the header or zero if the header is not visible
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setHeaderVisible

public void setHeaderVisible(boolean value)
Marks the receiver's header as visible if the argument is true , and marks it invisible otherwise.

If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, marking it visible may not actually cause it to be displayed.

Parameters:
value - the new visibility state
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getHeaderVisible

public boolean getHeaderVisible()
Returns true if the receiver's header is visible, and false otherwise.

If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, this method may still indicate that it is considered visible even though it may not actually be showing.

Returns:
the receiver's header's visibility state
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

indexOf

public int indexOf(
TreeColumn column)
Searches the receiver's list starting at the first column (index 0) until a column is found that is equal to the argument, and returns the index of that column. If no column is found, returns -1.

Parameters:
column - the search column
Returns:
the index of the column
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the column is null
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getColumn

public 
TreeColumn getColumn(int index)
Returns the column at the given, zero-relative index in the receiver. Throws an exception if the index is out of range. Columns are returned in the order that they were created. If no TreeColumns were created by the programmer, this method will throw ERROR_INVALID_RANGE despite the fact that a single column of data may be visible in the tree. This occurs when the programmer uses the tree like a list, adding items but never creating a column.

Parameters:
index - the index of the column to return
Returns:
the column at the given index
Throws:
IllegalArgumentException -
  • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
getColumnOrder(), setColumnOrder(int[]), TreeColumn.getMoveable(), TreeColumn.setMoveable(boolean), SWT.Move

getColumns

public 
TreeColumn[] getColumns()
Returns an array of TreeColumns which are the columns in the receiver. Columns are returned in the order that they were created. If no TreeColumns were created by the programmer, the array is empty, despite the fact that visually, one column of items may be visible. This occurs when the programmer uses the tree like a list, adding items but never creating a column.

Note: This is not the actual structure used by the receiver to maintain its list of items, so modifying the array will not affect the receiver.

Returns:
the items in the receiver
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
getColumnOrder(), setColumnOrder(int[]), TreeColumn.getMoveable(), TreeColumn.setMoveable(boolean), SWT.Move

setColumnOrder

public void setColumnOrder(int[] order)
Sets the order that the items in the receiver should be displayed in to the given argument which is described in terms of the zero-relative ordering of when the items were added.

Parameters:
order - the new order to display the items
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the item order is null
  • ERROR_INVALID_ARGUMENT - if the item order is not the same length as the number of items
See Also:
getColumnOrder(), TreeColumn.getMoveable(), TreeColumn.setMoveable(boolean), SWT.Move

setSortColumn

public void setSortColumn(
TreeColumn column)
Sets the column used by the sort indicator for the receiver. A null value will clear the sort indicator. The current sort column is cleared before the new column is set.

Parameters:
column - the column used by the sort indicator or null
Throws:
IllegalArgumentException -
  • ERROR_INVALID_ARGUMENT - if the column is disposed
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

setSortDirection

public void setSortDirection(int direction)
Sets the direction of the sort indicator for the receiver. The value can be one of UP, DOWN or NONE.

Parameters:
direction - the direction of the sort indicator
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

getSortColumn

public 
TreeColumn getSortColumn()
Returns the column which shows the sort indicator for the receiver. The value may be null if no column shows the sort indicator.

Returns:
the sort indicator
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
setSortColumn(TreeColumn)

getSortDirection

public int getSortDirection()
Returns the direction of the sort indicator for the receiver. The value will be one of UP, DOWN or NONE.

Returns:
the sort direction
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
setSortDirection(int)

getColumnOrder

public int[] getColumnOrder()
Returns an array of zero-relative integers that map the creation order of the receiver's items to the order in which they are currently being displayed.

Specifically, the indices of the returned array represent the current visual order of the items, and the contents of the array represent the creation order of the items.

Note: This is not the actual structure used by the receiver to maintain its list of items, so modifying the array will not affect the receiver.

Returns:
the current visual order of the receiver's items
Throws:
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
setColumnOrder(int[]), TreeColumn.getMoveable(), TreeColumn.setMoveable(boolean), SWT.Move

addSelectionListener

public void addSelectionListener(
SelectionListener listener)
Adds the listener to the collection of listeners who will be notified when the receiver's selection changes, by sending it one of the messages defined in the SelectionListener interface.

When widgetSelected is called, the item field of the event object is valid. If the receiver has SWT.CHECK style set and the check selection changes, the event object detail field contains the value SWT.CHECK. widgetDefaultSelected is typically called when an item is double-clicked. The item field of the event object is valid for default selection, but the detail field is not used.

Parameters:
listener - the listener which should be notified
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the listener is null
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
SelectionListener, removeSelectionListener(org.eclipse.swt.events.SelectionListener), SelectionEvent

removeSelectionListener

public void removeSelectionListener(
SelectionListener listener)
Removes the listener from the collection of listeners who will be notified when the receiver's selection changes.

Parameters:
listener - the listener which should no longer be notified
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the listener is null
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
SelectionListener, addSelectionListener(org.eclipse.swt.events.SelectionListener)

addTreeListener

public void addTreeListener(
TreeListener listener)
Adds the listener to the collection of listeners who will be notified when an item in the receiver is expanded or collapsed by sending it one of the messages defined in the TreeListener interface.

Parameters:
listener - the listener which should be notified
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the listener is null
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
TreeListener, removeTreeListener(org.eclipse.swt.events.TreeListener)

removeTreeListener

public void removeTreeListener(
TreeListener listener)
Removes the listener from the collection of listeners who will be notified when items in the receiver are expanded or collapsed.

Parameters:
listener - the listener which should no longer be notified
Throws:
IllegalArgumentException -
  • ERROR_NULL_ARGUMENT - if the listener is null
SWTException -
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
See Also:
TreeListener, addTreeListener(org.eclipse.swt.events.TreeListener)

computeSize

public 
Point computeSize(int wHint,
                         int hHint,
                         boolean changed)
Description copied from class: Control
Returns the preferred size of the receiver.

The preferred size of a control is the size that it would best be displayed at. The width hint and height hint arguments allow the caller to ask a control questions such as "Given a particular width, how high does the control need to be to show all of the contents?" To indicate that the caller does not wish to constrain a particular dimension, the constant SWT.DEFAULT is passed for the hint.

If the changed flag is true, it indicates that the receiver's contents have changed, therefore any caches that a layout manager containing the control may have been keeping need to be flushed. When the control is resized, the changed flag will be false, so layout manager caches can be retained.

Overrides:
computeSize in class Composite

Eclipse Rich Ajax Platform
Release 1.2

Copyright (c) Innoopract Informationssysteme GmbH and others 2002, 2008. All rights reserved.


 
 
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