Eclipse RAP Development Guide (Galileo) - Text (Eclipse Rich Ajax Platform API Specification)

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Eclipse Rich Ajax Platform
Release 1.2

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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:: Adaptable

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.

Due to limitations of the JavaScript library, the current WRAP behavior of a MULI line text is always as if WRAP was set.

Since:: 1.0

Field Summary

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 verifyListener)
          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 ( String string)
          Appends a string.

void clearSelection ()
          Clears the selection.

Point computeSize (int wHint, int hHint, boolean changed)
          Returns the preferred size of the receiver.

Rectangle computeTrim (int x, int y, int width, int height)
          Given a desired client area for the receiver (as described by the arguments), returns the bounding rectangle which would be required to produce that client area.

Object getAdapter ( Class adapter)
          Implementation of the Adaptable interface.

int getCharCount ()
          Returns the number of characters.

boolean getEditable ()
          Returns the editable state.

String getLineDelimiter ()
          Returns the line delimiter.

int getLineHeight ()
          Returns the height of a line.

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.

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

String getText ()
          Returns the widget text.

int getTextLimit ()
          Returns the maximum number of characters that the receiver is capable of holding.

void insert ( String string)
          Inserts a string.

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 verifyListener)
          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 setEditable (boolean editable)
          Sets the editable state.

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 ( String text)
          Sets the contents of the receiver to the given string.

void setTextLimit (int textLimit)
          Sets the maximum number of characters that the receiver is capable of holding to be the argument.

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

getClientArea

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

addControlListener, addFocusListener, addKeyListener, addMouseListener, addTraverseListener, computeSize, forceFocus, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getParent, getShell, getSize, getToolTipText, getVisible, isEnabled, isFocusControl, isVisible, moveAbove, moveBelow, pack, pack, redraw, removeControlListener, removeFocusListener, removeKeyListener, removeMouseListener, removeTraverseListener, setBackground, setBackgroundImage, setBounds, setBounds, setCursor, setEnabled, setFocus, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setRedraw, setSize, setSize, setToolTipText, setVisible, toControl, toControl, toDisplay, toDisplay

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

addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getStyle, isDisposed, notifyListeners, removeDisposeListener, 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

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:



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

getAdapter

public 
Object getAdapter(
Class adapter)

Description copied from class: Widget

Implementation of the Adaptable interface.

IMPORTANT: This method is not part of the RWT public API. It is marked public only so that it can be shared within the packages provided by RWT. It should never be accessed from application code.

Specified by:: getAdapter in interface Adaptable
Overrides:: getAdapter in class Control

setText

public void setText(
String text)

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:

text - the new text

Throws:



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

getText

public 
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

append

public void append(
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:



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

getLineDelimiter

public 
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

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

setTextLimit

public void setTextLimit(int textLimit)

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.

To reset this value to the default, use setTextLimit(Text.LIMIT). Specifying a limit value larger than Text.LIMIT sets the receiver's limit to Text.LIMIT.

Parameters:

textLimit - new text limit

Throws:



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

See Also:

LIMIT

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

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

Since:

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.

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.

Parameters:

selection - the point

Throws:



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

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 
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

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

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

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

getEditable

public boolean getEditable()

Returns the editable state.

Returns:

whether or not the receiver 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

insert

public void insert(
String string)

Inserts a string.

The old selection is replaced with the new text.

Parameters:

string - the string

Throws:



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

computeSize

public 
Point computeSize(int wHint,
                         int hHint,
                         boolean changed)

Description copied from class: Control

Returns the preferred size of the receiver.

The preferred size of a control is the size that it would best be displayed at. The width hint and height hint arguments allow the caller to ask a control questions such as "Given a particular width, how high does the control need to be to show all of the contents?" To indicate that the caller does not wish to constrain a particular dimension, the constant SWT.DEFAULT is passed for the hint.

If the changed flag is true, it indicates that the receiver's contents have changed, therefore any caches that a layout manager containing the control may have been keeping need to be flushed. When the control is resized, the changed flag will be false, so layout manager caches can be retained.

Overrides:: computeSize in class Control

Parameters:: wHint - the width hint (can be SWT.DEFAULT); hHint - the height hint (can be SWT.DEFAULT); changed - true if the control's contents have changed, and false otherwise
Returns:: the preferred size of the control.
See Also:: Layout, Control.getBorderWidth(), Control.getBounds(), Control.getSize(), Control.pack(boolean), "computeTrim, getClientArea for controls that implement them"

computeTrim

public 
Rectangle computeTrim(int x,
                             int y,
                             int width,
                             int height)

Description copied from class: Scrollable

Given a desired client area for the receiver (as described by the arguments), returns the bounding rectangle which would be required to produce that client area.

In other words, it returns a rectangle such that, if the receiver's bounds were set to that rectangle, the area of the receiver which is capable of displaying data (that is, not covered by the "trimmings") would be the rectangle described by the arguments (relative to the receiver's parent).

Overrides:: computeTrim in class Scrollable

Parameters:: x - the desired x coordinate of the client area; y - the desired y coordinate of the client area; width - the desired width of the client area; height - the desired height of the client area
Returns:: the required bounds to produce the given client area
See Also:: Scrollable.getClientArea()

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:



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

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:



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

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:



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

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:



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

addVerifyListener

public void addVerifyListener(
VerifyListener verifyListener)

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:

verifyListener - the listener which should be notified

Throws:



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

removeVerifyListener

public void removeVerifyListener(
VerifyListener verifyListener)

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

Parameters:

verifyListener - the listener which should no longer be notified

Throws:



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

Overview

Package

Class

Use

Tree

Deprecated

Index

Help

Eclipse Rich Ajax Platform
Release 1.2

PREV CLASS NEXT CLASS

FRAMES NO FRAMES

SUMMARY: NESTED | FIELD | CONSTR | METHOD

DETAIL: FIELD | CONSTR | METHOD

org.eclipse.swt.widgets Class Text

LIMIT

Text

getAdapter

setText

getText

append

getLineDelimiter

getLineHeight

setTextLimit

getTextLimit

getCharCount

setSelection

setSelection

setSelection

getSelection

getSelectionCount

getSelectionText

clearSelection

selectAll

setEditable

getEditable

insert

computeSize

computeTrim

addSelectionListener

removeSelectionListener

addModifyListener

removeModifyListener

addVerifyListener

removeVerifyListener

org.eclipse.swt.widgets
Class Text