org.eclipse.swt.widgets
Class List

java.lang.Object
  org.eclipse.swt.widgets.Widget
      org.eclipse.swt.widgets.Control
          org.eclipse.swt.widgets.Scrollable
              org.eclipse.swt.widgets.List

All Implemented Interfaces:

Adaptable, Drawable

public class List
extends Scrollable

Instances of this class represent a selectable user interface object that displays a list of strings and issues notification when a string is selected. A list may be single or multi select.

Styles:

SINGLE, MULTI

Events:

Selection, DefaultSelection

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

IMPORTANT: This class is not intended to be subclassed.

Since:

1.0

Constructor Summary

List(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	add(java.lang.String string) Adds the argument to the end of the receiver's list.
void	add(java.lang.String string, int index) Adds the argument to the receiver's list at the given zero-relative index.
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.
Point	computeSize(int wHint, int hHint, boolean changed) Returns the preferred size of the receiver.
void	deselect(int index) Deselects the item at the given zero-relative index in the receiver.
void	deselect(int[] indices) Deselects the items at the given zero-relative indices in the receiver.
void	deselect(int start, int end) Deselects the items at the given zero-relative indices in the receiver.
void	deselectAll() Deselects all selected items in the receiver.
<T> T	getAdapter(java.lang.Class<T> adapter) Implementation of the Adaptable interface.
int	getFocusIndex() Returns the zero-relative index of the item which currently has the focus in the receiver, or -1 if no item has focus.
java.lang.String	getItem(int index) Returns the item at the given, zero-relative index in the receiver.
int	getItemCount() Returns the number of items contained in the receiver.
int	getItemHeight() Returns the height of the area which would be used to display one of the items in the list.
java.lang.String[]	getItems() Returns a (possibly empty) array of Strings which are the items in the receiver.
java.lang.String[]	getSelection() Returns an array of Strings that are currently selected in the receiver.
int	getSelectionCount() Returns the number of selected items contained in the receiver.
int	getSelectionIndex() Returns the zero-relative index of the item which is currently selected in the receiver, or -1 if no item is selected.
int[]	getSelectionIndices() Returns the zero-relative indices of the items which are currently selected in the receiver.
int	getTopIndex() Returns the zero-relative index of the item which is currently at the top of the receiver.
int	indexOf(java.lang.String string) Gets the index of an item.
int	indexOf(java.lang.String string, int start) Searches the receiver's list starting at the given, zero-relative index until an item is found that is equal to the argument, and returns the index of that item.
boolean	isSelected(int index) Returns true if the item is selected, and false otherwise.
void	remove(int index) Removes the item from the receiver at the given zero-relative index.
void	remove(int[] indices) Removes the items from the receiver at the given zero-relative indices.
void	remove(int start, int end) Removes the items from the receiver which are between the given zero-relative start and end indices (inclusive).
void	remove(java.lang.String string) Searches the receiver's list starting at the first item until an item is found that is equal to the argument, and removes that item from the list.
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	select(int index) Selects the item at the given zero-relative index in the receiver's list.
void	select(int[] indices) Selects the items at the given zero-relative indices in the receiver.
void	select(int start, int end) Selects the items in the range specified by the given zero-relative indices in the receiver.
void	selectAll() Selects all of the items in the receiver.
void	setData(java.lang.String key, java.lang.Object value) Sets the application defined property of the receiver with the specified name to the given value.
void	setFont(Font font) Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null.
void	setItem(int index, java.lang.String string) Sets the text of the item in the receiver's list at the given zero-relative index to the string argument.
void	setItems(java.lang.String[] items) Sets the receiver's items to be the given array of items.
void	setSelection(int selection) Selects the item at the given zero-relative index in the receiver.
void	setSelection(int[] selection) Selects the items at the given zero-relative indices in the receiver.
void	setSelection(int start, int end) Selects the items in the range specified by the given zero-relative indices in the receiver.
void	setSelection(java.lang.String[] selection) Sets the receiver's selection to be the given array of items.
void	setTopIndex(int topIndex) Sets the zero-relative index of the item which is currently at the top of the receiver.
void	showSelection() Shows the selection.

Methods inherited from class org.eclipse.swt.widgets.Scrollable

computeTrim, getClientArea, getHorizontalBar, getVerticalBar

Methods inherited from class org.eclipse.swt.widgets.Control

addControlListener, addDragDetectListener, addFocusListener, addGestureListener, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addTouchListener, addTraverseListener, computeSize, forceFocus, getAccessible, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getOrientation, getParent, getShell, getSize, getToolTipText, getTouchEnabled, getVisible, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, redraw, redraw, removeControlListener, removeDragDetectListener, removeFocusListener, removeGestureListener, removeHelpListener, removeKeyListener, removeMenuDetectListener, removeMouseListener, removeTouchListener, removeTraverseListener, setBackground, setBackgroundImage, setBounds, setBounds, setCursor, setEnabled, setFocus, setForeground, setLayoutData, setLocation, setLocation, setMenu, setOrientation, setParent, setRedraw, setSize, setSize, setToolTipText, setTouchEnabled, setVisible, toControl, toControl, toDisplay, toDisplay, update

Methods inherited from class org.eclipse.swt.widgets.Widget

addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

List

public List(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:

java.lang.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, Widget.checkSubclass(), Widget.getStyle()

Method Detail

getAdapter

public <T> T getAdapter(java.lang.Class<T> 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 Control

Parameters:

adapter - the lookup class

Returns:

an object that can be cast to the given class or null if there is no adapter associated with the given class.

getSelection

public java.lang.String[] getSelection()

Returns an array of Strings 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

getSelectionIndex

public int getSelectionIndex()

Returns the zero-relative index of the item which is currently selected in the receiver, or -1 if no item is selected.

Returns:

the index of the selected item or -1

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

getSelectionIndices

public int[] getSelectionIndices()

Returns the zero-relative indices of the items which are currently selected in the receiver. The order of the indices is unspecified. The array is empty if 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:

the array of indices of the 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

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(int selection)

Selects the item at the given zero-relative index in the receiver. If the item at the index was already selected, it remains selected. The current selection is first cleared, then the new item is selected. Indices that are out of range are ignored.

Parameters:

selection - the index of the item to select

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:

deselectAll(), select(int)

setSelection

public void setSelection(int[] selection)

Selects the items at the given zero-relative indices in the receiver. The current selection is cleared before the new items are selected.

Indices that are out of range and duplicate indices are ignored. If the receiver is single-select and multiple indices are specified, then all indices are ignored.

Parameters:

selection - the indices of the items to select

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the array of indices 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:

deselectAll(), select(int[])

setSelection

public void setSelection(int start,
                         int end)

Selects the items in the range specified by the given zero-relative indices in the receiver. The range of indices is inclusive. The current selection is cleared before the new items are selected.

Indices that are out of range are ignored and no items will be selected if start is greater than end. If the receiver is single-select and there is more than one item in the given range, then all indices are ignored.

Parameters:

start - the start index of the items to select

end - the end index of the items to select

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:

deselectAll(), select(int,int)

setSelection

public void setSelection(java.lang.String[] 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:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the array of items 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:

deselectAll(), select(int[]), setSelection(int[])

select

public void select(int index)

Selects the item at the given zero-relative index in the receiver's list. If the item at the index was already selected, it remains selected. Indices that are out of range are ignored.

Parameters:

index - the index of the item to select

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

select

public void select(int[] indices)

Selects the items at the given zero-relative indices in the receiver. The current selection is not cleared before the new items are selected.

If the item at a given index is not selected, it is selected. If the item at a given index was already selected, it remains selected. Indices that are out of range and duplicate indices are ignored. If the receiver is single-select and multiple indices are specified, then all indices are ignored.

Parameters:

indices - the array of indices for the items to select

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the array of indices 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:

setSelection(int[])

select

public void select(int start,
                   int end)

Selects the items in the range specified by the given zero-relative indices in the receiver. The range of indices is inclusive. The current selection is not cleared before the new items are selected.

If an item in the given range is not selected, it is selected. If an item in the given range was already selected, it remains selected. Indices that are out of range are ignored and no items will be selected if start is greater than end. If the receiver is single-select and there is more than one item in the given range, then all indices are ignored.

Parameters:

start - the start of the range

end - the end of the range

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:

setSelection(int,int)

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

deselect

public void deselect(int index)

Deselects the item at the given zero-relative index in the receiver. If the item at the index was already deselected, it remains deselected. Indices that are out of range are ignored.

Parameters:

index - the index of the item to deselect

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

Since:

1.3

deselect

public void deselect(int start,
                     int end)

Deselects the items at the given zero-relative indices in the receiver. If the item at the given zero-relative index in the receiver is selected, it is deselected. If the item at the index was not selected, it remains deselected. The range of the indices is inclusive. Indices that are out of range are ignored.

Parameters:

start - the start index of the items to deselect

end - the end index of the items to deselect

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

Since:

1.3

deselect

public void deselect(int[] indices)

Deselects the items at the given zero-relative indices in the receiver. If the item at the given zero-relative index in the receiver is selected, it is deselected. If the item at the index was not selected, it remains deselected. Indices that are out of range and duplicate indices are ignored.

Parameters:

indices - the array of indices for the items to deselect

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the set of indices 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

Since:

1.3

isSelected

public boolean isSelected(int index)

Returns true if the item is selected, and false otherwise. Indices out of range are ignored.

Parameters:

index - the index of the item

Returns:

the visibility state of the item at the index

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

setTopIndex

public void setTopIndex(int topIndex)

Sets the zero-relative index of the item which is currently at the top of the receiver. This index can change when items are scrolled or new items are added and removed.

Parameters:

topIndex - the index of the top 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

Since:

1.3

getTopIndex

public int getTopIndex()

Returns the zero-relative index of the item which is currently at the top of the receiver. This index can change when items are scrolled or new items are added or removed.

Returns:

the index of the top 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

Since:

1.3

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

Since:

1.3

getFocusIndex

public int getFocusIndex()

Returns the zero-relative index of the item which currently has the focus in the receiver, or -1 if no item has focus.

Returns:

the index of the selected 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

add

public void add(java.lang.String string)

Adds the argument to the end of the receiver's list.

Parameters:

string - the new item

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the string 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:

add(String,int)

add

public void add(java.lang.String string,
                int index)

Adds the argument to the receiver's list at the given zero-relative index.

Note: To add an item at the end of the list, use the result of calling getItemCount() as the index or use add(String).

Parameters:

string - the new item

index - the index for the item

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the string is null
• ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list (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:

add(String)

remove

public void remove(int index)

Removes the item from the receiver at the given zero-relative index.

Parameters:

index - the index for the item

Throws:

java.lang.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

remove

public void remove(int start,
                   int end)

Removes the items from the receiver which are between the given zero-relative start and end indices (inclusive).

Parameters:

start - the start of the range

end - the end of the range

Throws:

java.lang.IllegalArgumentException -

• ERROR_INVALID_RANGE - if either the start or end are 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

remove

public void remove(int[] indices)

Removes the items from the receiver at the given zero-relative indices.

Parameters:

indices - the array of indices of the items

Throws:

java.lang.IllegalArgumentException -

• ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
• ERROR_NULL_ARGUMENT - if the indices array 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

remove

public void remove(java.lang.String string)

Searches the receiver's list starting at the first item until an item is found that is equal to the argument, and removes that item from the list.

Parameters:

string - the item to remove

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the string is null
• ERROR_INVALID_ARGUMENT - if the string is not found in the list

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

setItem

public void setItem(int index,
                    java.lang.String string)

Sets the text of the item in the receiver's list at the given zero-relative index to the string argument. This is equivalent to remove'ing the old item at the index, and then add'ing the new item at that index.

Parameters:

index - the index for the item

string - the new text for the item

Throws:

java.lang.IllegalArgumentException -

• ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
• ERROR_NULL_ARGUMENT - if the string 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

setItems

public void setItems(java.lang.String[] items)

Sets the receiver's items to be the given array of items.

Parameters:

items - the array of items

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the items array is null
• ERROR_INVALID_ARGUMENT - if an item in the items array 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

getItem

public java.lang.String 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:

java.lang.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

getItemCount

public int getItemCount()

Returns the number of items contained in the receiver.

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 java.lang.String[] getItems()

Returns a (possibly empty) array of Strings which are the items in the receiver.

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's list

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(java.lang.String string)

Gets the index of an item.

The list is searched starting at 0 until an item is found that is equal to the search item. If no item is found, -1 is returned. Indexing is zero based.

Parameters:

string - the search item

Returns:

the index of the item

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the string 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

indexOf

public int indexOf(java.lang.String string,
                   int start)

Searches the receiver's list starting at the given, zero-relative index until an item is found that is equal to the argument, and returns the index of that item. If no item is found or the starting index is out of range, returns -1.

Parameters:

string - the search item

start - the zero-relative index at which to start the search

Returns:

the index of the item

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the string 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

getItemHeight

public int getItemHeight()

Returns the height of the area which would be used to display one of the items in the list.

Returns:

the height of one 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

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.

widgetSelected is called when the selection changes. widgetDefaultSelected is typically called when an item is double-clicked.

Parameters:

listener - the listener which should be notified

Throws:

java.lang.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:

java.lang.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)

setFont

public void setFont(Font font)

Description copied from class: Control

Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null.

Overrides:

setFont in class Control

Parameters:

font - the new font (or null)

setData

public void setData(java.lang.String key,
                    java.lang.Object value)

Description copied from class: Widget

Sets the application defined property of the receiver with the specified name to the given value.

Applications may associate arbitrary objects with the receiver in this fashion. If the objects stored in the properties need to be notified when the widget is disposed of, it is the application's responsibility to hook the Dispose event on the widget and do so.

Overrides:

setData in class Control

Parameters:

key - the name of the property

value - the new value for the property

See Also:

Widget.getData(String)

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 Control

Parameters:

wHint - the width hint (can be SWT.DEFAULT)

hHint - the height hint (can be SWT.DEFAULT)

changed - true if the control's contents have changed, and false otherwise

Returns:

the preferred size of the control.

See Also:

Layout, Control.getBorderWidth(), Control.getBounds(), Control.getSize(), Control.pack(boolean), "computeTrim, getClientArea for controls that implement them"