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java.lang.Objectorg.eclipse.swt.widgets.Widget
org.eclipse.swt.widgets.Item
org.eclipse.swt.widgets.TreeColumn
public class TreeColumn
Instances of this class represent a column in a tree widget.
Note: Only one of the styles LEFT, RIGHT and CENTER may be specified.
IMPORTANT: This class is not intended to be subclassed.
Field Summary |
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Fields inherited from class org.eclipse.swt.widgets.Widget |
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handle |
Constructor Summary | |
---|---|
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 | |
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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. |
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. |
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(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 no tool tip text should be shown. |
void |
setWidth(int width)
Sets the width of the receiver. |
Methods inherited from class org.eclipse.swt.widgets.Item |
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getImage, getText |
Methods inherited from class org.eclipse.swt.widgets.Widget |
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addDisposeListener, addListener, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, setData, setData, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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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 construct
java.lang.IllegalArgumentException
- 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 parent
java.lang.IllegalArgumentException
- SWTException
- SWT.LEFT
,
SWT.RIGHT
,
SWT.CENTER
,
Widget.checkSubclass()
,
Widget.getStyle()
Method Detail |
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public void addControlListener(ControlListener listener)
ControlListener
interface.
listener
- the listener which should be notified
java.lang.IllegalArgumentException
- 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 user
java.lang.IllegalArgumentException
- 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 java.lang.String getToolTipText()
SWTException
- public int getWidth()
SWTException
- public void pack()
SWTException
- public void removeControlListener(ControlListener listener)
listener
- the listener which should no longer be notified
java.lang.IllegalArgumentException
- SWTException
- ControlListener
,
addControlListener(org.eclipse.swt.events.ControlListener)
public void removeSelectionListener(SelectionListener listener)
listener
- the listener which should no longer be notified
java.lang.IllegalArgumentException
- 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 alignment
SWTException
- public void setImage(Image image)
Item
setImage
in class Item
image
- the image to display on the receiver (may be null)public void setMoveable(boolean moveable)
moveable
- the moveable attribute
SWTException
- Tree.setColumnOrder(int[])
,
Tree.getColumnOrder()
,
getMoveable()
,
SWT.Move
public void setResizable(boolean resizable)
resizable
- the resize attribute
SWTException
- public void setText(java.lang.String string)
Item
setText
in class Item
string
- the new textpublic void setToolTipText(java.lang.String string)
string
- the new tool tip text (or null)
SWTException
- public void setWidth(int width)
width
- the new width
SWTException
-
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