Package org.eclipse.swt.widgets

Class TabFolder

java.lang.Object

org.eclipse.swt.widgets.Widget

org.eclipse.swt.widgets.Control

org.eclipse.swt.widgets.Scrollable

org.eclipse.swt.widgets.Composite

org.eclipse.swt.widgets.TabFolder

All Implemented Interfaces:

Adaptable, Drawable

public class TabFolder
extends Composite

Instances of this class implement the notebook user interface metaphor. It allows the user to select a notebook page from set of pages.

The item children that may be added to instances of this class must be of type TabItem. Control children are created and then set into a tab item using TabItem#setControl.

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

Styles:

TOP, BOTTOM

Events:

Selection

Note: Only one of the styles TOP and BOTTOM may be specified.

IMPORTANT: This class is not intended to be subclassed.

Since:

1.0

Constructor Summary

Constructors

Constructor	Description
TabFolder(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

Modifier and Type	Method	Description
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.
Rectangle	computeTrim(int x, int y, int width, int height)	Given a desired client area for the receiver (as described by the arguments), returns the bounding rectangle which would be required to produce that client area.
<T> T	getAdapter(Class<T> adapter)	Implementation of the Adaptable interface.
Rectangle	getClientArea()	Returns a rectangle which describes the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings").
TabItem	getItem(int index)	Returns the item at the given, zero-relative index in the receiver.
TabItem	getItem(Point point)	Returns the tab 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.
TabItem[]	getItems()	Returns an array of TabItems which are the items in the receiver.
TabItem[]	getSelection()	Returns an array of TabItems that are currently selected 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	indexOf(TabItem 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	layout()	If the receiver has a layout, asks the layout to lay out (that is, set the size and location of) the receiver's children.
void	removeSelectionListener(SelectionListener listener)	Removes the listener from the collection of listeners who will be notified when the receiver's selection changes.
void	setSelection(int index)	Selects the item at the given zero-relative index in the receiver.
void	setSelection(TabItem item)	Sets the receiver's selection to the given item.
void	setSelection(TabItem[] items)	Sets the receiver's selection to be the given array of items.

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

changed, getBackgroundMode, getChildren, getLayout, getLayoutDeferred, getTabList, isLayoutDeferred, layout, layout, layout, layout, setBackgroundMode, setFocus, setLayout, setLayoutDeferred, setTabList

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

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, requestLayout, setBackground, setBackgroundImage, setBounds, setBounds, setCursor, setData, setEnabled, setFont, 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 Details

TabFolder

public TabFolder(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
• Widget.checkSubclass()
• Widget.getStyle()

Method Details

getAdapter

public <T> T getAdapter(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 Composite

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.

getItems

public TabItem[] getItems()

Returns an array of TabItems 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

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 TabItem 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

getItem

public TabItem getItem(Point point)

Returns the tab 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.

Parameters:

point - the point used to locate the item

Returns:

the tab item at the given point, or null if the point is not in a tab 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

Since:

1.3

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

indexOf

public int indexOf(TabItem 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 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

getSelection

public TabItem[] getSelection()

Returns an array of TabItems that are currently selected in the receiver. 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

setSelection

public void setSelection(TabItem item)

Sets the receiver's selection to the given item. The current selected is first cleared, then the new item is selected.

Parameters:

item - the item to select

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the item 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

setSelection

public void setSelection(TabItem[] items)

Sets the receiver's selection to be the given array of items. The current selected is first cleared, then the new items are selected.

Parameters:

items - the array of items

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if 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

setSelection

public void setSelection(int index)

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 items are 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

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

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

layout

public void layout()

Description copied from class: Composite

If the receiver has a layout, asks the layout to lay out (that is, set the size and location of) the receiver's children. If the receiver does not have a layout, do nothing.

Use of this method is discouraged since it is the least-efficient way to trigger a layout. The use of layout(true) discards all cached layout information, even from controls which have not changed. It is much more efficient to invoke Control.requestLayout() on every control which has changed in the layout than it is to invoke this method on the layout itself.

This is equivalent to calling layout(true).

Note: Layout is different from painting. If a child is moved or resized such that an area in the parent is exposed, then the parent will paint. If no child is affected, the parent will not paint.

Overrides:

layout in class Composite

getClientArea

public Rectangle getClientArea()

Description copied from class: Scrollable

Returns a rectangle which describes the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings").

Overrides:

getClientArea in class Scrollable

Returns:

the client area

See Also:

• Scrollable.computeTrim(int, int, int, int)

computeTrim

public Rectangle computeTrim(int x,
 int y,
 int width,
 int height)

Description copied from class: Scrollable

Given a desired client area for the receiver (as described by the arguments), returns the bounding rectangle which would be required to produce that client area.

In other words, it returns a rectangle such that, if the receiver's bounds were set to that rectangle, the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings") would be the rectangle described by the arguments (relative to the receiver's parent).

Overrides:

computeTrim in class Scrollable

Parameters:

x - the desired x coordinate of the client area

y - the desired y coordinate of the client area

width - the desired width of the client area

height - the desired height of the client area

Returns:

the required bounds to produce the given client area

See Also:

• Scrollable.getClientArea()

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

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"

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. widgetDefaultSelected is not called.

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)