org.eclipse.swt.widgets

Class TabItem

java.lang.Object

org.eclipse.swt.widgets.Widget

org.eclipse.swt.widgets.Item

org.eclipse.swt.widgets.TabItem

public class TabItem
extends Item

Instances of this class represent a selectable user interface object corresponding to a tab for a page in a tab folder.

Styles:

(none)

Events:

(none)

IMPORTANT: This class is not intended to be subclassed.

See Also:

TabFolder, TabItem snippets, Sample code and further information

Structure Diagram

Field Summary

Fields

Modifier and Type	Field and Description
(package private) Control	control
(package private) TabFolder	parent
(package private) java.lang.String	toolTipText

Fields inherited from class org.eclipse.swt.widgets.Item

image, text

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

CANVAS, data, DEFAULT_HEIGHT, DEFAULT_WIDTH, DISABLED, display, DISPOSE_SENT, DISPOSED, DRAG_DETECT, DRAW_BACKGROUND, eventTable, FOREIGN_HANDLE, HIDDEN, IGNORE_WM_CHANGEUISTATE, KEYED_DATA, LAYOUT_CHANGED, LAYOUT_CHILD, LAYOUT_NEEDED, MAJOR, MINOR, MOVE_DEFERRED, MOVE_OCCURRED, PARENT_BACKGROUND, RELEASED, RESIZE_DEFERRED, RESIZE_OCCURRED, SKIN_NEEDED, state, style, THEME_BACKGROUND, TRACK_MOUSE

Constructor Summary

Constructors

Constructor and Description
TabItem(TabFolder parent, int style) Constructs a new instance of this class given its parent (which must be a TabFolder) and a style value describing its behavior and appearance.
TabItem(TabFolder parent, int style, int index) Constructs a new instance of this class given its parent (which must be a TabFolder), a style value describing its behavior and appearance, and the index at which to place it in the items maintained by its parent.

Method Summary

Methods

Modifier and Type	Method and Description
(package private) void	_setText(int index, java.lang.String string)
protected void	checkSubclass() Checks that this class can be subclassed.
(package private) void	destroyWidget() Destroys the widget in the operating system and releases the widget's handle.
Rectangle	getBounds() Returns a rectangle describing the receiver's size and location relative to its parent.
Control	getControl() Returns the control that is used to fill the client area of the tab folder when the user selects the tab item.
TabFolder	getParent() Returns the receiver's parent, which must be a TabFolder.
java.lang.String	getToolTipText() Returns the receiver's tool tip text, or null if it has not been set.
(package private) void	releaseHandle()
(package private) void	releaseParent()
(package private) void	releaseWidget()
void	setControl(Control control) Sets the control that is used to fill the client area of the tab folder when the user selects the tab item.
void	setImage(Image image) Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.
void	setText(java.lang.String string) Sets the receiver's text.
void	setToolTipText(java.lang.String string) Sets the receiver's tool tip text to the argument, which may be null indicating that the default tool tip for the control will be shown.

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

getImage, getNameText, getText

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

_addListener, addDisposeListener, addListener, callWindowProc, checkBits, checkOpened, checkOrientation, checkParent, checkWidget, DeferWindowPos, dispose, dragDetect, error, filters, findItem, fixMnemonic, fixMnemonic, getData, getData, getDisplay, getListeners, getMenu, getName, getStyle, hooks, isDisposed, isListening, isValidSubclass, isValidThread, mapEvent, new_GC, notifyListeners, postEvent, postEvent, release, releaseChildren, removeDisposeListener, removeListener, removeListener, reskin, reskinChildren, reskinWidget, sendDragEvent, sendDragEvent, sendEvent, sendEvent, sendEvent, sendEvent, sendFocusEvent, sendKeyEvent, sendKeyEvent, sendMouseEvent, sendMouseEvent, sendMouseWheelEvent, sendSelectionEvent, sendSelectionEvent, setData, setData, setInputState, setKeyState, setLocationMask, setTabGroupFocus, setTabItemFocus, SetWindowPos, showMenu, showMenu, toString, updateMenuLocation, wmCaptureChanged, wmChar, wmContextMenu, wmIMEChar, wmKeyDown, wmKeyUp, wmKillFocus, wmLButtonDblClk, wmLButtonDown, wmLButtonUp, wmMButtonDblClk, wmMButtonDown, wmMButtonUp, wmMouseHover, wmMouseHWheel, wmMouseLeave, wmMouseMove, wmMouseWheel, wmNCPaint, wmPaint, wmPrint, wmRButtonDblClk, wmRButtonDown, wmRButtonUp, wmSetFocus, wmSysChar, wmSysKeyDown, wmSysKeyUp, wmXButtonDblClk, wmXButtonDown, wmXButtonUp

Methods inherited from class java.lang.Object

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

Field Detail

parent

TabFolder parent

control

Control control

toolTipText

java.lang.String toolTipText

Constructor Detail

TabItem

public TabItem(TabFolder parent,
       int style)

Constructs a new instance of this class given its parent (which must be a TabFolder) and a style value describing its behavior and appearance. The item is added to the end of the items maintained by its parent.

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, Widget.checkSubclass(), Widget.getStyle()

TabItem

public TabItem(TabFolder parent,
       int style,
       int index)

Constructs a new instance of this class given its parent (which must be a TabFolder), a style value describing its behavior and appearance, and the index at which to place it in the items maintained by its parent.

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

index - the zero-relative index to store the receiver in its parent

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the parent is null
• ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)

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 Detail

_setText

void _setText(int index,
            java.lang.String string)

checkSubclass

protected void checkSubclass()

Description copied from class: Widget

Checks that this class can be subclassed.

The SWT class library is intended to be subclassed only at specific, controlled points (most notably, Composite and Canvas when implementing new widgets). This method enforces this rule unless it is overridden.

IMPORTANT: By providing an implementation of this method that allows a subclass of a class which does not normally allow subclassing to be created, the implementer agrees to be fully responsible for the fact that any such subclass will likely fail between SWT releases and will be strongly platform specific. No support is provided for user-written classes which are implemented in this fashion.

The ability to subclass outside of the allowed SWT classes is intended purely to enable those not on the SWT development team to implement patches in order to get around specific limitations in advance of when those limitations can be addressed by the team. Subclassing should not be attempted without an intimate and detailed understanding of the hierarchy.

Overrides:

checkSubclass in class Item

destroyWidget

void destroyWidget()

Description copied from class: Widget

Destroys the widget in the operating system and releases the widget's handle. If the widget does not have a handle, this method may hide the widget, mark the widget as destroyed or do nothing, depending on the widget.

When a widget is destroyed in the operating system, its descendants are also destroyed by the operating system. This means that it is only necessary to call destroyWidget on the root of the widget tree.

This method is called after releaseWidget().

See also releaseChild(), releaseWidget() and releaseHandle().

Overrides:

destroyWidget in class Widget

See Also:

Widget.dispose()

getControl

public Control getControl()

Returns the control that is used to fill the client area of the tab folder when the user selects the tab item. If no control has been set, return null.

Returns:

the control

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

getBounds

public Rectangle getBounds()

Returns a rectangle describing the receiver's size and location relative to its parent.

Returns:

the receiver's bounding rectangle

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:

3.4

getParent

public TabFolder getParent()

Returns the receiver's parent, which must be a TabFolder.

Returns:

the receiver's parent

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

getToolTipText

public java.lang.String getToolTipText()

Returns the receiver's tool tip text, or null if it has not been set.

Returns:

the receiver's tool tip text

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

releaseHandle

void releaseHandle()

Overrides:

releaseHandle in class Widget

releaseParent

void releaseParent()

Overrides:

releaseParent in class Widget

releaseWidget

void releaseWidget()

Overrides:

releaseWidget in class Item

setControl

public void setControl(Control control)

Sets the control that is used to fill the client area of the tab folder when the user selects the tab item.

Parameters:

control - the new control (or null)

Throws:

java.lang.IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the control has been disposed
• ERROR_INVALID_PARENT - if the control is not in the same widget tree

SWTException -

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

setImage

public void setImage(Image image)

Description copied from class: Item

Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.

Overrides:

setImage in class Item

Parameters:

image - the image to display on the receiver (may be null)

setText

public void setText(java.lang.String string)

Sets the receiver's text. The string may include the mnemonic character.

Mnemonics are indicated by an '&' that causes the next character to be the mnemonic. When the user presses a key sequence that matches the mnemonic, a selection event occurs. On most platforms, the mnemonic appears underlined but may be emphasised in a platform specific manner. The mnemonic indicator character '&' can be escaped by doubling it in the string, causing a single '&' to be displayed.

Overrides:

setText in class Item

Parameters:

string - the new text

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the text 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

setToolTipText

public void setToolTipText(java.lang.String string)

Sets the receiver's tool tip text to the argument, which may be null indicating that the default tool tip for the control will be shown. For a control that has a default tool tip, such as the Tree control on Windows, setting the tool tip text to an empty string replaces the default, causing no tool tip text to be shown.

The mnemonic indicator (character '&') is not displayed in a tool tip. To display a single '&' in the tool tip, the character '&' can be escaped by doubling it in the string.

Parameters:

string - the new tool tip text (or null)

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