public class TreeColumn extends Item
Note: Only one of the styles LEFT, RIGHT and CENTER may be specified.
IMPORTANT: This class is not intended to be subclassed.
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. |
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. |
protected void |
checkSubclass()
Checks that this class can be subclassed.
|
int |
getAlignment()
Returns a value which describes the position of the
text or image in the receiver.
|
boolean |
getMoveable()
Gets the moveable attribute.
|
Tree |
getParent()
Returns the receiver's parent, which must be a
Tree . |
boolean |
getResizable()
Gets the resizable attribute.
|
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.
|
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.
|
void |
setMoveable(boolean moveable)
Sets the moveable attribute.
|
void |
setResizable(boolean resizable)
Sets the resizable attribute.
|
void |
setText(String string)
Sets the receiver's text.
|
void |
setToolTipText(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.
|
addDisposeListener, addListener, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isAutoDirection, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, setData, toString
public TreeColumn(Tree parent, int style)
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.
parent
- a composite control which will be the parent of the new instance (cannot be null)style
- the style of control to constructIllegalArgumentException
- SWTException
- SWT.LEFT
,
SWT.RIGHT
,
SWT.CENTER
,
Widget.checkSubclass()
,
Widget.getStyle()
public TreeColumn(Tree parent, int style, int index)
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.
parent
- a composite control which will be the parent of the new instance (cannot be null)style
- the style of control to constructindex
- the zero-relative index to store the receiver in its parentIllegalArgumentException
- SWTException
- SWT.LEFT
,
SWT.RIGHT
,
SWT.CENTER
,
Widget.checkSubclass()
,
Widget.getStyle()
public void addControlListener(ControlListener listener)
ControlListener
interface.listener
- the listener which should be notifiedIllegalArgumentException
- SWTException
- ControlListener
,
removeControlListener(org.eclipse.swt.events.ControlListener)
public void addSelectionListener(SelectionListener listener)
SelectionListener
interface.
widgetSelected
is called when the column header is selected.
widgetDefaultSelected
is not called.
listener
- the listener which should be notified when the control is selected by the userIllegalArgumentException
- SWTException
- SelectionListener
,
removeSelectionListener(org.eclipse.swt.events.SelectionListener)
,
SelectionEvent
protected void checkSubclass()
Widget
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.
checkSubclass
in class Item
public int getAlignment()
LEFT
, RIGHT
or CENTER
.SWTException
- public boolean getMoveable()
SWTException
- Tree.getColumnOrder()
,
Tree.setColumnOrder(int[])
,
setMoveable(boolean)
,
SWT.Move
public Tree getParent()
Tree
.SWTException
- public boolean getResizable()
SWTException
- public String getToolTipText()
SWTException
- public int getWidth()
SWTException
- public void pack()
SWTException
- public void removeControlListener(ControlListener listener)
listener
- the listener which should no longer be notifiedIllegalArgumentException
- SWTException
- ControlListener
,
addControlListener(org.eclipse.swt.events.ControlListener)
public void removeSelectionListener(SelectionListener listener)
listener
- the listener which should no longer be notifiedIllegalArgumentException
- SWTException
- SelectionListener
,
addSelectionListener(org.eclipse.swt.events.SelectionListener)
public void setAlignment(int alignment)
LEFT
, RIGHT
or CENTER
.
Note that due to a restriction on some platforms, the first column is always left aligned.
alignment
- the new alignmentSWTException
- public void setImage(Image image)
Item
public void setMoveable(boolean moveable)
moveable
- the moveable attributeSWTException
- Tree.setColumnOrder(int[])
,
Tree.getColumnOrder()
,
getMoveable()
,
SWT.Move
public void setResizable(boolean resizable)
resizable
- the resize attributeSWTException
- public void setText(String string)
Item
Note: If control characters like '\n', '\t' etc. are used in the string, then the behavior is platform dependent.
public void setToolTipText(String string)
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.
string
- the new tool tip text (or null)SWTException
- public void setWidth(int width)
width
- the new widthSWTException
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