org.eclipse.swt.widgets
Class Text

java.lang.Object
  org.eclipse.swt.widgets.Widget
      org.eclipse.swt.widgets.Control
          org.eclipse.swt.widgets.Scrollable
              org.eclipse.swt.widgets.Text

All Implemented Interfaces:

Drawable

Direct Known Subclasses:

TextExtension

public class Text

extends Scrollable

Instances of this class are selectable user interface objects that allow the user to enter and modify text.

Styles:

CENTER, LEFT, MULTI, PASSWORD, SINGLE, RIGHT, READ_ONLY, WRAP

Events:

DefaultSelection, Modify, Verify

Note: Only one of the styles MULTI and SINGLE may be specified.

IMPORTANT: This class is not intended to be subclassed.

Field Summary

static java.lang.String	DELIMITER The delimiter used by multi-line text widgets.
static int	LIMIT The maximum number of characters that can be entered into a text widget.

Constructor Summary

Text(Composite parent, int style)
Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

Method Summary

void	addModifyListener(ModifyListener listener) Adds the listener to the collection of listeners who will be notified when the receiver's text is modified, by sending it one of the messages defined in the ModifyListener interface.
void	addSelectionListener(SelectionListener listener) Adds the listener to the collection of listeners who will be notified when the control is selected, by sending it one of the messages defined in the SelectionListener interface.
void	addVerifyListener(VerifyListener listener) Adds the listener to the collection of listeners who will be notified when the receiver's text is verified, by sending it one of the messages defined in the VerifyListener interface.
void	append(java.lang.String string) Appends a string.
void	clearSelection() Clears the selection.
void	copy() Copies the selected text.
void	cut() Cuts the selected text.
int	getCaretLineNumber() Returns the line number of the caret.
Point	getCaretLocation() Returns a point describing the receiver's location relative to its parent (or its display if its parent is null).
int	getCaretPosition() Returns the character position of the caret.
int	getCharCount() Returns the number of characters.
boolean	getDoubleClickEnabled() Returns the double click enabled flag.
char	getEchoChar() Returns the echo character.
boolean	getEditable() Returns the editable state.
int	getLineCount() Returns the number of lines.
java.lang.String	getLineDelimiter() Returns the line delimiter.
int	getLineHeight() Returns the height of a line.
int	getOrientation() Returns the orientation of the receiver, which will be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
Point	getSelection() Returns a Point whose x coordinate is the character position representing the start of the selected text, and whose y coordinate is the character position representing the end of the selection.
int	getSelectionCount() Returns the number of selected characters.
java.lang.String	getSelectionText() Gets the selected text, or an empty string if there is no current selection.
java.lang.String	getText() Returns the widget text.
java.lang.String	getText(int start, int end) Returns a range of text.
int	getTextLimit() Returns the maximum number of characters that the receiver is capable of holding.
int	getTopIndex() Returns the zero-relative index of the line which is currently at the top of the receiver.
int	getTopPixel() Returns the top pixel.
void	insert(java.lang.String string) Inserts a string.
void	paste() Pastes text from clipboard.
void	removeModifyListener(ModifyListener listener) Removes the listener from the collection of listeners who will be notified when the receiver's text is modified.
void	removeSelectionListener(SelectionListener listener) Removes the listener from the collection of listeners who will be notified when the control is selected.
void	removeVerifyListener(VerifyListener listener) Removes the listener from the collection of listeners who will be notified when the control is verified.
void	selectAll() Selects all the text in the receiver.
void	setDoubleClickEnabled(boolean doubleClick) Sets the double click enabled flag.
void	setEchoChar(char echo) Sets the echo character.
void	setEditable(boolean editable) Sets the editable state.
void	setOrientation(int orientation) Sets the orientation of the receiver, which must be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
void	setSelection(int start) Sets the selection.
void	setSelection(int start, int end) Sets the selection to the range specified by the given start and end indices.
void	setSelection(Point selection) Sets the selection to the range specified by the given point, where the x coordinate represents the start index and the y coordinate represents the end index.
void	setText(java.lang.String string) Sets the contents of the receiver to the given string.
void	setTextLimit(int limit) Sets the maximum number of characters that the receiver is capable of holding to be the argument.
void	setTopIndex(int index) Sets the zero-relative index of the line which is currently at the top of the receiver.
void	showSelection() Shows the selection.

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

computeTrim, getClientArea, getHorizontalBar, getVerticalBar

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

addControlListener, addFocusListener, addKeyListener, addMouseListener, addMouseMoveListener, addPaintListener, addTraverseListener, computeSize, computeSize, forceFocus, getBackground, getBorderWidth, getBounds, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getParent, getShell, getSize, getToolTipText, getVisible, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, redraw, redraw, removeControlListener, removeFocusListener, removeKeyListener, removeMouseListener, removeMouseMoveListener, removePaintListener, removeTraverseListener, setBackground, setBounds, setBounds, setCapture, setEnabled, setFocus, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setParent, setRedraw, setSize, setSize, setToolTipText, setVisible, toControl, toControl, toDisplay, toDisplay, traverse, update

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

addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getStyle, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, setData, setData, toString

Methods inherited from class java.lang.Object

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

Field Detail

LIMIT

public static final int LIMIT

The maximum number of characters that can be entered into a text widget.

Note that this value is platform dependent, based upon the native widget implementation.

See Also:

Constant Field Values

DELIMITER

public static final java.lang.String DELIMITER

The delimiter used by multi-line text widgets. When text is queried and from the widget, it will be delimited using this delimiter.

See Also:

Constant Field Values

Constructor Detail

Text

public Text(Composite parent,
            int style)

Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

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.SINGLE, SWT.MULTI, SWT.READ_ONLY, SWT.WRAP, Widget.checkSubclass(), Widget.getStyle()

Method Detail

addModifyListener

public void addModifyListener(ModifyListener listener)

Adds the listener to the collection of listeners who will be notified when the receiver's text is modified, by sending it one of the messages defined in the ModifyListener 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:

ModifyListener, removeModifyListener(org.eclipse.swt.events.ModifyListener)

addSelectionListener

public void addSelectionListener(SelectionListener listener)

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

widgetSelected is not called for texts. widgetDefaultSelected is typically called when ENTER is pressed in a single-line text.

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:

SelectionListener, removeSelectionListener(org.eclipse.swt.events.SelectionListener), SelectionEvent

addVerifyListener

public void addVerifyListener(VerifyListener listener)

Adds the listener to the collection of listeners who will be notified when the receiver's text is verified, by sending it one of the messages defined in the VerifyListener 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:

VerifyListener, removeVerifyListener(org.eclipse.swt.events.VerifyListener)

append

public void append(java.lang.String string)

Appends a string.

The new text is appended to the text at the end of the widget.

Parameters:

string - the string to be appended

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the string 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

clearSelection

public void clearSelection()

Clears the selection.

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

copy

public void copy()

Copies the selected text.

The current selection is copied to the clipboard.

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

cut

public void cut()

Cuts the selected text.

The current selection is first copied to the clipboard and then deleted from the widget.

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

getCaretLineNumber

public int getCaretLineNumber()

Returns the line number of the caret.

The line number of the caret is returned.

Returns:

the line number

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

getCaretLocation

public Point getCaretLocation()

Returns a point describing the receiver's location relative to its parent (or its display if its parent is null).

The location of the caret is returned.

Returns:

a point, the location of the caret

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

getCaretPosition

public int getCaretPosition()

Returns the character position of the caret.

Indexing is zero based.

Returns:

the position of the caret

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

getCharCount

public int getCharCount()

Returns the number of characters.

Returns:

number of characters in the widget

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

getDoubleClickEnabled

public boolean getDoubleClickEnabled()

Returns the double click enabled flag.

The double click flag enables or disables the default action of the text widget when the user double clicks.

Returns:

whether or not double click is enabled

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

getEchoChar

public char getEchoChar()

Returns the echo character.

The echo character is the character that is displayed when the user enters text or the text is changed by the programmer.

Returns:

the echo character

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

See Also:

setEchoChar(char)

getEditable

public boolean getEditable()

Returns the editable state.

Returns:

whether or not the reciever is editable

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

getLineCount

public int getLineCount()

Returns the number of lines.

Returns:

the number of lines in the widget

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

getLineDelimiter

public java.lang.String getLineDelimiter()

Returns the line delimiter.

Returns:

a string that is the line delimiter

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

See Also:

DELIMITER

getLineHeight

public int getLineHeight()

Returns the height of a line.

Returns:

the height of a row of 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

getOrientation

public int getOrientation()

Returns the orientation of the receiver, which will be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.

Returns:

the orientation style

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:

2.1.2

getSelection

public Point getSelection()

Returns a Point whose x coordinate is the character position representing the start of the selected text, and whose y coordinate is the character position representing the end of the selection. An "empty" selection is indicated by the x and y coordinates having the same value.

Indexing is zero based. The range of a selection is from 0..N where N is the number of characters in the widget.

Returns:

a point representing the selection start and end

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

getSelectionCount

public int getSelectionCount()

Returns the number of selected characters.

Returns:

the number of selected characters.

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

getSelectionText

public java.lang.String getSelectionText()

Gets the selected text, or an empty string if there is no current selection.

Returns:

the selected 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

getText

public java.lang.String getText()

Returns the widget text.

The text for a text widget is the characters in the widget, or an empty string if this has never been set.

Returns:

the widget 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

getText

public java.lang.String getText(int start,
                                int end)

Returns a range of text. Returns an empty string if the start of the range is greater than the end.

Indexing is zero based. The range of a selection is from 0..N-1 where N is the number of characters in the widget.

Parameters:

start - the start of the range

end - the end of the range

Returns:

the range of 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

getTextLimit

public int getTextLimit()

Returns the maximum number of characters that the receiver is capable of holding.

If this has not been changed by setTextLimit(), it will be the constant Text.LIMIT.

Returns:

the text limit

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

See Also:

LIMIT

getTopIndex

public int getTopIndex()

Returns the zero-relative index of the line which is currently at the top of the receiver.

This index can change when lines are scrolled or new lines are added or removed.

Returns:

the index of the top line

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

getTopPixel

public int getTopPixel()

Returns the top pixel.

The top pixel is the pixel position of the line that is currently at the top of the widget. On some platforms, a text widget can be scrolled by pixels instead of lines so that a partial line is displayed at the top of the widget.

The top pixel changes when the widget is scrolled. The top pixel does not include the widget trimming.

Returns:

the pixel position of the top line

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

insert

public void insert(java.lang.String string)

Inserts a string.

The old selection is replaced with the new text.

Parameters:

string - the string

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the string 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

paste

public void paste()

Pastes text from clipboard.

The selected text is deleted from the widget and new text inserted from the clipboard.

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

removeModifyListener

public void removeModifyListener(ModifyListener listener)

Removes the listener from the collection of listeners who will be notified when the receiver's text is modified.

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:

ModifyListener, addModifyListener(org.eclipse.swt.events.ModifyListener)

removeSelectionListener

public void removeSelectionListener(SelectionListener listener)

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

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)

removeVerifyListener

public void removeVerifyListener(VerifyListener listener)

Removes the listener from the collection of listeners who will be notified when the control is verified.

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:

VerifyListener, addVerifyListener(org.eclipse.swt.events.VerifyListener)

selectAll

public void selectAll()

Selects all the text 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

setDoubleClickEnabled

public void setDoubleClickEnabled(boolean doubleClick)

Sets the double click enabled flag.

The double click flag enables or disables the default action of the text widget when the user double clicks.

Note: This operation is a hint and is not supported on platforms that do not have this concept.

Parameters:

doubleClick - the new double click flag

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

setEchoChar

public void setEchoChar(char echo)

Sets the echo character.

The echo character is the character that is displayed when the user enters text or the text is changed by the programmer. Setting the echo character to '\0' clears the echo character and redraws the original text. If for any reason the echo character is invalid, or if the platform does not allow modification of the echo character, the default echo character for the platform is used.

Parameters:

echo - the new echo character

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

setEditable

public void setEditable(boolean editable)

Sets the editable state.

Parameters:

editable - the new editable 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

setOrientation

public void setOrientation(int orientation)

Sets the orientation of the receiver, which must be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.

Note: This operation is a hint and is not supported on platforms that do not have this concept.

Parameters:

orientation - new orientation style

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:

2.1.2

setSelection

public void setSelection(int start)

Sets the selection.

Indexing is zero based. The range of a selection is from 0..N where N is the number of characters in the widget.

Text selections are specified in terms of caret positions. In a text widget that contains N characters, there are N+1 caret positions, ranging from 0..N. This differs from other functions that address character position such as getText () that use the regular array indexing rules.

Parameters:

start - new caret position

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

setSelection

public void setSelection(int start,
                         int end)

Sets the selection to the range specified by the given start and end indices.

Indexing is zero based. The range of a selection is from 0..N where N is the number of characters in the widget.

Text selections are specified in terms of caret positions. In a text widget that contains N characters, there are N+1 caret positions, ranging from 0..N. This differs from other functions that address character position such as getText () that use the usual array indexing rules.

Parameters:

start - the start of the range

end - the end of the range

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

setSelection

public void setSelection(Point selection)

Sets the selection to the range specified by the given point, where the x coordinate represents the start index and the y coordinate represents the end index.

Indexing is zero based. The range of a selection is from 0..N where N is the number of characters in the widget.

Text selections are specified in terms of caret positions. In a text widget that contains N characters, there are N+1 caret positions, ranging from 0..N. This differs from other functions that address character position such as getText () that use the usual array indexing rules.

Parameters:

selection - the point

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the point 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

setText

public void setText(java.lang.String string)

Sets the contents of the receiver to the given string. If the receiver has style SINGLE and the argument contains multiple lines of text, the result of this operation is undefined and may vary from platform to platform.

Parameters:

string - the new text

Throws:

java.lang.IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the string 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

setTextLimit

public void setTextLimit(int limit)

Sets the maximum number of characters that the receiver is capable of holding to be the argument.

Instead of trying to set the text limit to zero, consider creating a read-only text widget.

Specifying a limit value larger than Text.LIMIT sets the receiver's limit to Text.LIMIT.

Parameters:

limit - new text limit

Throws:

java.lang.IllegalArgumentException -

• ERROR_CANNOT_BE_ZERO - if the limit is zero

SWTException -

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

setTopIndex

public void setTopIndex(int index)

Sets the zero-relative index of the line which is currently at the top of the receiver. This index can change when lines are scrolled or new lines are added and removed.

Parameters:

index - the index of the top 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

showSelection

public void showSelection()

Shows the selection.

If the selection is already showing in the receiver, this method simply returns. Otherwise, lines are scrolled until the selection is visible.

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