Package org.eclipse.swt.widgets

Class TreeItem

java.lang.Object

org.eclipse.swt.widgets.Widget

org.eclipse.swt.widgets.Item

org.eclipse.swt.widgets.TreeItem

public class TreeItem
extends Item

Instances of this class represent a selectable user interface object that represents a hierarchy of tree items in a tree widget.

Styles:

(none)

Events:

(none)

IMPORTANT: This class is not intended to be subclassed.

See Also:

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

Restriction:

This class is not intended to be subclassed by clients.

Field Summary

Fields

Modifier and Type	Field	Description
long	handle	the handle to the OS resource (Warning: This field is platform dependent)

Constructor Summary

Constructors

Constructor	Description
TreeItem(TreeItem parentItem, int style)	Constructs TreeItem and inserts it into Tree.
TreeItem(TreeItem parentItem, int style, int index)	Constructs TreeItem and inserts it into Tree.
TreeItem(Tree parent, int style)	Constructs TreeItem and inserts it into Tree.
TreeItem(Tree parent, int style, int index)	Constructs TreeItem and inserts it into Tree.

Method Summary

Modifier and Type	Method	Description
protected void	checkSubclass()	Checks that this class can be subclassed.
void	clear(int index, boolean all)	Clears the item at the given zero-relative index in the receiver.
void	clearAll(boolean all)	Clears all the items in the receiver.
Color	getBackground()	Returns the receiver's background color.
Color	getBackground(int index)	Returns the background color at the given column index in the receiver.
Rectangle	getBounds()	Returns a rectangle describing the size and location of the receiver's text relative to its parent.
Rectangle	getBounds(int index)	Returns a rectangle describing the receiver's size and location relative to its parent at a column in the tree.
boolean	getChecked()	Returns true if the receiver is checked, and false otherwise.
boolean	getExpanded()	Returns true if the receiver is expanded, and false otherwise.
Font	getFont()	Returns the font that the receiver will use to paint textual information for this item.
Font	getFont(int index)	Returns the font that the receiver will use to paint textual information for the specified cell in this item.
Color	getForeground()	Returns the foreground color that the receiver will use to draw.
Color	getForeground(int index)	Returns the foreground color at the given column index in the receiver.
boolean	getGrayed()	Returns true if the receiver is grayed, and false otherwise.
Image	getImage()	Returns the receiver's image if it has one, or null if it does not.
Image	getImage(int index)	Returns the image stored at the given column index in the receiver, or null if the image has not been set or if the column does not exist.
Rectangle	getImageBounds(int index)	Returns a rectangle describing the size and location relative to its parent of an image at a column in the tree.
TreeItem	getItem(int index)	Returns the item at the given, zero-relative index in the receiver.
int	getItemCount()	Returns the number of items contained in the receiver that are direct item children of the receiver.
TreeItem[]	getItems()	Returns a (possibly empty) array of TreeItems which are the direct item children of the receiver.
Tree	getParent()	Returns the receiver's parent, which must be a Tree.
TreeItem	getParentItem()	Returns the receiver's parent item, which must be a TreeItem or null when the receiver is a root.
String	getText()	Returns the receiver's text, which will be an empty string if it has never been set.
String	getText(int index)	Returns the text stored at the given column index in the receiver, or empty string if the text has not been set.
Rectangle	getTextBounds(int index)	Returns a rectangle describing the size and location relative to its parent of the text at a column in the tree.
int	indexOf(TreeItem 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	removeAll()	Removes all of the items from the receiver.
void	setBackground(int index, Color color)	Sets the background color at the given column index in the receiver to the color specified by the argument, or to the default system color for the item if the argument is null.
void	setBackground(Color color)	Sets the receiver's background color to the color specified by the argument, or to the default system color for the item if the argument is null.
void	setChecked(boolean checked)	Sets the checked state of the receiver.
void	setExpanded(boolean expanded)	Sets the expanded state of the receiver.
void	setFont(int index, Font font)	Sets the font that the receiver will use to paint textual information for the specified cell in this item to the font specified by the argument, or to the default font for that kind of control if the argument is null.
void	setFont(Font font)	Sets the font that the receiver will use to paint textual information for this item to the font specified by the argument, or to the default font for that kind of control if the argument is null.
void	setForeground(int index, Color color)	Sets the foreground color at the given column index in the receiver to the color specified by the argument, or to the default system color for the item if the argument is null.
void	setForeground(Color color)	Sets the receiver's foreground color to the color specified by the argument, or to the default system color for the item if the argument is null.
void	setGrayed(boolean grayed)	Sets the grayed state of the checkbox for this item.
void	setImage(int index, Image image)	Sets the receiver's image at a column.
void	setImage(Image image)	Sets the receiver's image to the argument, which may be null indicating that no image should be displayed.
void	setImage(Image[] images)	Sets the image for multiple columns in the tree.
void	setItemCount(int count)	Sets the number of child items contained in the receiver.
void	setText(int index, String string)	Sets the receiver's text at a column
void	setText(String string)	Sets the receiver's text.
void	setText(String[] strings)	Sets the text for multiple columns in the tree.

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

addDisposeListener, addListener, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isAutoDirection, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, setData, toString

Methods inherited from class java.lang.Object

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

Field Details

handle

public long handle

the handle to the OS resource (Warning: This field is platform dependent)

IMPORTANT: This field is not part of the SWT public API. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms and should never be accessed from application code.

Restriction:

This field is not intended to be referenced by clients.

Constructor Details

TreeItem

public TreeItem(Tree parent,
 int style)

Constructs TreeItem and inserts it into Tree. Item is inserted as last direct child of the tree.

The fastest way to insert many items is documented in TreeItem(Tree,int,int) and setItemCount(int)

Parameters:

parent - a tree control which will be the parent of the new instance (cannot be null)

style - no styles are currently supported, pass SWT.NONE

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()

TreeItem

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

Constructs TreeItem and inserts it into Tree. Item is inserted as index direct child of the tree.

The fastest way to insert many items is:

1. Use Tree.setRedraw(boolean) to disable drawing during bulk insert
2. Insert every item at index 0 (insert them in reverse to get the same result)
3. Collapse the parent item before inserting (gives massive improvement on Windows)

Parameters:

parent - a tree control which will be the parent of the new instance (cannot be null)

style - no styles are currently supported, pass SWT.NONE

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

Throws:

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()
• Tree.setRedraw(boolean)

TreeItem

public TreeItem(TreeItem parentItem,
 int style)

Constructs TreeItem and inserts it into Tree. Item is inserted as last direct child of the specified TreeItem.

The fastest way to insert many items is documented in TreeItem(Tree,int,int) and setItemCount(int)

Parameters:

parentItem - a tree control which will be the parent of the new instance (cannot be null)

style - no styles are currently supported, pass SWT.NONE

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()

TreeItem

public TreeItem(TreeItem parentItem,
 int style,
 int index)

Constructs TreeItem and inserts it into Tree. Item is inserted as index direct child of the specified TreeItem.

The fastest way to insert many items is documented in TreeItem(Tree,int,int) and setItemCount(int)

Parameters:

parentItem - a tree control which will be the parent of the new instance (cannot be null)

style - no styles are currently supported, pass SWT.NONE

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

Throws:

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()
• Tree.setRedraw(boolean)

Method Details

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

clear

public void clear(int index,
 boolean all)

Clears the item at the given zero-relative index in the receiver. The text, icon and other attributes of the item are set to the default value. If the tree was created with the SWT.VIRTUAL style, these attributes are requested again as needed.

Parameters:

index - the index of the item to clear

all - true if all child items of the indexed item should be cleared recursively, and false otherwise

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

Since:

3.2

See Also:

• SWT.VIRTUAL
• SWT.SetData

clearAll

public void clearAll(boolean all)

Clears all the items in the receiver. The text, icon and other attributes of the items are set to their default values. If the tree was created with the SWT.VIRTUAL style, these attributes are requested again as needed.

Parameters:

all - true if all child items should be cleared recursively, and false otherwise

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:

• SWT.VIRTUAL
• SWT.SetData

getBackground

public Color getBackground()

Returns the receiver's background color.

Returns:

the background color

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:

2.0

getBackground

public Color getBackground(int index)

Returns the background color at the given column index in the receiver.

Parameters:

index - the column index

Returns:

the background color

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:

3.1

getBounds

public Rectangle getBounds()

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

Returns:

the bounding rectangle of the receiver's 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

getBounds

public Rectangle getBounds(int index)

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

Parameters:

index - the index that specifies the column

Returns:

the receiver's bounding column 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:

3.1

getChecked

public boolean getChecked()

Returns true if the receiver is checked, and false otherwise. When the parent does not have the CHECK style, return false.

Returns:

the checked state

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

getExpanded

public boolean getExpanded()

Returns true if the receiver is expanded, and false otherwise.

Returns:

the expanded state

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

getFont

public Font getFont()

Returns the font that the receiver will use to paint textual information for this item.

Returns:

the receiver's font

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:

3.0

getFont

public Font getFont(int index)

Returns the font that the receiver will use to paint textual information for the specified cell in this item.

Parameters:

index - the column index

Returns:

the receiver's font

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:

3.1

getForeground

public Color getForeground()

Returns the foreground color that the receiver will use to draw.

Returns:

the receiver's foreground color

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:

2.0

getForeground

public Color getForeground(int index)

Returns the foreground color at the given column index in the receiver.

Parameters:

index - the column index

Returns:

the foreground color

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:

3.1

getGrayed

public boolean getGrayed()

Returns true if the receiver is grayed, and false otherwise. When the parent does not have the CHECK style, return false.

Returns:

the grayed state of the checkbox

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 TreeItem 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

Since:

3.1

getItemCount

public int getItemCount()

Returns the number of items contained in the receiver that are direct item children of 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

getItems

public TreeItem[] getItems()

Returns a (possibly empty) array of TreeItems which are the direct item children of 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 receiver's 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

getImage

public Image getImage()

Description copied from class: Item

Returns the receiver's image if it has one, or null if it does not.

Overrides:

getImage in class Item

Returns:

the receiver's image

getImage

public Image getImage(int index)

Returns the image stored at the given column index in the receiver, or null if the image has not been set or if the column does not exist.

Parameters:

index - the column index

Returns:

the image stored at the given column index 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

Since:

3.1

getImageBounds

public Rectangle getImageBounds(int index)

Returns a rectangle describing the size and location relative to its parent of an image at a column in the tree.

Parameters:

index - the index that specifies the column

Returns:

the receiver's bounding image 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:

3.1

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

getParentItem

public TreeItem getParentItem()

Returns the receiver's parent item, which must be a TreeItem or null when the receiver is a root.

Returns:

the receiver's parent 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

getText

public String getText()

Description copied from class: Item

Returns the receiver's text, which will be an empty string if it has never been set.

Overrides:

getText in class Item

Returns:

the receiver's text

getText

public String getText(int index)

Returns the text stored at the given column index in the receiver, or empty string if the text has not been set.

Parameters:

index - the column index

Returns:

the text stored at the given column index 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

Since:

3.1

getTextBounds

public Rectangle getTextBounds(int index)

Returns a rectangle describing the size and location relative to its parent of the text at a column in the tree.

Parameters:

index - the index that specifies the column

Returns:

the receiver's bounding text 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:

3.3

indexOf

public int indexOf(TreeItem 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 item is null
• ERROR_INVALID_ARGUMENT - if the item has been disposed

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:

3.1

removeAll

public void removeAll()

Removes all of the items from 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

Since:

3.1

setBackground

public void setBackground(Color color)

Sets the receiver's background color to the color specified by the argument, or to the default system color for the item if the argument is null.

Parameters:

color - the new color (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument has been disposed

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:

2.0

setBackground

public void setBackground(int index,
 Color color)

Sets the background color at the given column index in the receiver to the color specified by the argument, or to the default system color for the item if the argument is null.

Parameters:

index - the column index

color - the new color (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument has been disposed

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:

3.1

setChecked

public void setChecked(boolean checked)

Sets the checked state of the receiver.

Parameters:

checked - the new checked state

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

setExpanded

public void setExpanded(boolean expanded)

Sets the expanded state of the receiver.

Parameters:

expanded - the new expanded state

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

setFont

public void setFont(Font font)

Sets the font that the receiver will use to paint textual information for this item to the font specified by the argument, or to the default font for that kind of control if the argument is null.

Parameters:

font - the new font (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument has been disposed

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:

3.0

setFont

public void setFont(int index,
 Font font)

Sets the font that the receiver will use to paint textual information for the specified cell in this item to the font specified by the argument, or to the default font for that kind of control if the argument is null.

Parameters:

index - the column index

font - the new font (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument has been disposed

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:

3.1

setForeground

public void setForeground(Color color)

Sets the receiver's foreground color to the color specified by the argument, or to the default system color for the item if the argument is null.

Parameters:

color - the new color (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument has been disposed

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:

2.0

setForeground

public void setForeground(int index,
 Color color)

Sets the foreground color at the given column index in the receiver to the color specified by the argument, or to the default system color for the item if the argument is null.

Parameters:

index - the column index

color - the new color (or null)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the argument has been disposed

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:

3.1

setGrayed

public void setGrayed(boolean grayed)

Sets the grayed state of the checkbox for this item. This state change only applies if the Tree was created with the SWT.CHECK style.

Parameters:

grayed - the new grayed state of the checkbox

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[] images)

Sets the image for multiple columns in the tree.

Parameters:

images - the array of new images

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the array of images is null
• ERROR_INVALID_ARGUMENT - if one of the images has been disposed

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:

3.1

setImage

public void setImage(int index,
 Image image)

Sets the receiver's image at a column.

Parameters:

index - the column index

image - the new image

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the image has been disposed

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:

3.1

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)

setItemCount

public void setItemCount(int count)

Sets the number of child items contained in the receiver.

The fastest way to insert many items is:

1. Use Tree.setRedraw(boolean) to disable drawing during bulk insert
2. Collapse the parent item before inserting (gives massive improvement on Windows)

Parameters:

count - 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

Since:

3.2

setText

public void setText(String[] strings)

Sets the text for multiple columns in the tree.

Note: If control characters like '\n', '\t' etc. are used in the string, then the behavior is platform dependent.

Parameters:

strings - the array of new strings

Throws:

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

Since:

3.1

setText

public void setText(int index,
 String string)

Sets the receiver's text at a column

Note: If control characters like '\n', '\t' etc. are used in the string, then the behavior is platform dependent.

Parameters:

index - the column index

string - the new text

Throws:

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

Since:

3.1

setText

public void setText(String string)

Description copied from class: Item

Sets the receiver's text.

Note: If control characters like '\n', '\t' etc. are used in the string, then the behavior is platform dependent.

Overrides:

setText in class Item

Parameters:

string - the new text