org.eclipse.swt.widgets

Class TreeColumn

java.lang.Object

org.eclipse.swt.widgets.Widget

org.eclipse.swt.widgets.Item

org.eclipse.swt.widgets.TreeColumn

public class TreeColumn
extends Item

Instances of this class represent a column in a tree widget.

Styles:

LEFT, RIGHT, CENTER

Events:

Move, Resize, Selection

Note: Only one of the styles LEFT, RIGHT and CENTER may be specified.

IMPORTANT: This class is not intended to be subclassed.

Since:

3.1

See Also:

Tree, TreeItem, TreeColumn snippets, Sample code and further information

Structure Diagram

Field Summary

Fields

Modifier and Type	Field and Description
(package private) int	id
(package private) boolean	moveable
(package private) Tree	parent
(package private) boolean	resizable
(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
TreeColumn(Tree parent, int style) Constructs a new instance of this class given its parent (which must be a Tree) and a style value describing its behavior and appearance.
TreeColumn(Tree parent, int style, int index) Constructs a new instance of this class given its parent (which must be a Tree), 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
void	addControlListener(ControlListener listener) Adds the listener to the collection of listeners who will be notified when the control is moved or resized, by sending it one of the messages defined in the ControlListener interface.
void	addSelectionListener(SelectionListener listener) Adds the listener to the collection of listeners who will be notified when the control is selected by the user, by sending it one of the messages defined in the SelectionListener interface.
(package private) static int	checkStyle(int style)
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.
int	getAlignment() Returns a value which describes the position of the text or image in the receiver.
boolean	getMoveable() Gets the moveable attribute.
(package private) java.lang.String	getNameText()
Tree	getParent() Returns the receiver's parent, which must be a Tree.
boolean	getResizable() Gets the resizable attribute.
java.lang.String	getToolTipText() Returns the receiver's tool tip text, or null if it has not been set.
int	getWidth() Gets the width of the receiver.
void	pack() Causes the receiver to be resized to its preferred size.
(package private) void	releaseHandle()
(package private) void	releaseParent()
void	removeControlListener(ControlListener listener) Removes the listener from the collection of listeners who will be notified when the control is moved or resized.
void	removeSelectionListener(SelectionListener listener) Removes the listener from the collection of listeners who will be notified when the control is selected by the user.
void	setAlignment(int alignment) Controls how text and images will be displayed in the receiver.
void	setImage(Image image) Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.
(package private) void	setImage(Image image, boolean sort, boolean right)
void	setMoveable(boolean moveable) Sets the moveable attribute.
void	setResizable(boolean resizable) Sets the resizable attribute.
(package private) void	setSortDirection(int direction)
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.
void	setWidth(int width) Sets the width of the receiver.
(package private) void	updateToolTip(int index)

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

getImage, getText, releaseWidget

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

Tree parent

resizable

boolean resizable

moveable

boolean moveable

toolTipText

java.lang.String toolTipText

id

int id

Constructor Detail

TreeColumn

public TreeColumn(Tree parent,
          int style)

Constructs a new instance of this class given its parent (which must be a Tree) 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.LEFT, SWT.RIGHT, SWT.CENTER, Widget.checkSubclass(), Widget.getStyle()

TreeColumn

public TreeColumn(Tree parent,
          int style,
          int index)

Constructs a new instance of this class given its parent (which must be a Tree), 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.

Note that due to a restriction on some platforms, the first column is always left aligned.

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.LEFT, SWT.RIGHT, SWT.CENTER, Widget.checkSubclass(), Widget.getStyle()

Method Detail

addControlListener

public void addControlListener(ControlListener listener)

Adds the listener to the collection of listeners who will be notified when the control is moved or resized, by sending it one of the messages defined in the ControlListener interface.

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:

ControlListener, removeControlListener(org.eclipse.swt.events.ControlListener)

addSelectionListener

public void addSelectionListener(SelectionListener listener)

Adds the listener to the collection of listeners who will be notified when the control is selected by the user, by sending it one of the messages defined in the SelectionListener interface.

widgetSelected is called when the column header is selected. widgetDefaultSelected is not called.

Parameters:

listener - the listener which should be notified when the control is selected by the user

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

checkStyle

static int checkStyle(int style)

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()

getAlignment

public int getAlignment()

Returns a value which describes the position of the text or image in the receiver. The value will be one of LEFT, RIGHT or CENTER.

Returns:

the alignment

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

getMoveable

public boolean getMoveable()

Gets the moveable attribute. A column that is not moveable cannot be reordered by the user by dragging the header but may be reordered by the programmer.

Returns:

the moveable attribute

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:

3.2

See Also:

Tree.getColumnOrder(), Tree.setColumnOrder(int[]), setMoveable(boolean), SWT.Move

getNameText

java.lang.String getNameText()

Overrides:

getNameText in class Item

getParent

public Tree getParent()

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

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

getResizable

public boolean getResizable()

Gets the resizable attribute. A column that is not resizable cannot be dragged by the user but may be resized by the programmer.

Returns:

the resizable attribute

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

Since:

3.2

getWidth

public int getWidth()

Gets the width of the receiver.

Returns:

the width

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

pack

public void pack()

Causes the receiver to be resized to its preferred size. For a composite, this involves computing the preferred size from its layout, if there is one.

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

removeControlListener

public void removeControlListener(ControlListener listener)

Removes the listener from the collection of listeners who will be notified when the control is moved or resized.

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:

ControlListener, addControlListener(org.eclipse.swt.events.ControlListener)

removeSelectionListener

public void removeSelectionListener(SelectionListener listener)

Removes the listener from the collection of listeners who will be notified when the control is selected by the user.

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)

setAlignment

public void setAlignment(int alignment)

Controls how text and images will be displayed in the receiver. The argument should be one of LEFT, RIGHT or CENTER.

Note that due to a restriction on some platforms, the first column is always left aligned.

Parameters:

alignment - the new alignment

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

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)

setImage

void setImage(Image image,
            boolean sort,
            boolean right)

setMoveable

public void setMoveable(boolean moveable)

Sets the moveable attribute. A column that is moveable can be reordered by the user by dragging the header. A column that is not moveable cannot be dragged by the user but may be reordered by the programmer.

Parameters:

moveable - the moveable attribute

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:

3.2

See Also:

Tree.setColumnOrder(int[]), Tree.getColumnOrder(), getMoveable(), SWT.Move

setResizable

public void setResizable(boolean resizable)

Sets the resizable attribute. A column that is not resizable cannot be dragged by the user but may be resized by the programmer.

Parameters:

resizable - the resize attribute

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

setSortDirection

void setSortDirection(int direction)

setText

public void setText(java.lang.String string)

Description copied from class: Item

Sets the receiver's text.

Overrides:

setText in class Item

Parameters:

string - the new text

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

Since:

3.2

setWidth

public void setWidth(int width)

Sets the width of the receiver.

Parameters:

width - the new width

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

updateToolTip

void updateToolTip(int index)