com.google.gwt.user.client.ui

Class TextArea

java.lang.Object

com.google.gwt.user.client.ui.UIObject

com.google.gwt.user.client.ui.Widget

com.google.gwt.user.client.ui.FocusWidget

com.google.gwt.user.client.ui.ValueBoxBase<java.lang.String>

com.google.gwt.user.client.ui.TextBoxBase

com.google.gwt.user.client.ui.TextArea

All Implemented Interfaces:

IsEditor<ValueBoxEditor<java.lang.String>>, HasAllDragAndDropHandlers, HasAllFocusHandlers, HasAllGestureHandlers, HasAllKeyHandlers, HasAllMouseHandlers, HasAllTouchHandlers, HasBlurHandlers, HasChangeHandlers, HasClickHandlers, HasDoubleClickHandlers, HasDragEndHandlers, HasDragEnterHandlers, HasDragHandlers, HasDragLeaveHandlers, HasDragOverHandlers, HasDragStartHandlers, HasDropHandlers, HasFocusHandlers, HasGestureChangeHandlers, HasGestureEndHandlers, HasGestureStartHandlers, HasKeyDownHandlers, HasKeyPressHandlers, HasKeyUpHandlers, HasMouseDownHandlers, HasMouseMoveHandlers, HasMouseOutHandlers, HasMouseOverHandlers, HasMouseUpHandlers, HasMouseWheelHandlers, HasTouchCancelHandlers, HasTouchEndHandlers, HasTouchMoveHandlers, HasTouchStartHandlers, HasAttachHandlers, HasValueChangeHandlers<java.lang.String>, HasHandlers, AutoDirectionHandler.Target, HasDirection, HasDirectionEstimator, EventListener, TakesValue<java.lang.String>, Focusable, HasEnabled, HasFocus, HasName, HasText, HasValue<java.lang.String>, HasVisibility, IsWidget, SourcesChangeEvents, SourcesClickEvents, SourcesFocusEvents, SourcesKeyboardEvents, SourcesMouseEvents

public class TextArea
extends TextBoxBase

A text box that allows multiple lines of text to be entered.

CSS Style Rules

• .gwt-TextArea { primary style }
• .gwt-TextArea-readonly { dependent style set when the text area is read-only }

Built-in Bidi Text Support

This widget is capable of automatically adjusting its direction according to the input text. This feature is controlled by ValueBoxBase.setDirectionEstimator(boolean), and is available by default when at least one of the application's locales is right-to-left.

Example

public class TextBoxExample implements EntryPoint {

  public void onModuleLoad() {
    // Make some text boxes. The password text box is identical to the text
    // box, except that the input is visually masked by the browser.
    PasswordTextBox ptb = new PasswordTextBox();
    TextBox tb = new TextBox();

    // TODO(ECC) must be tested.
    tb.addKeyPressHandler(new KeyPressHandler() {

      public void onKeyPress(KeyPressEvent event) {
        if (!Character.isDigit(event.getCharCode())) {
          ((TextBox) event.getSource()).cancelKey();
        }
      }
    });

    // Let's make an 80x50 text area to go along with the other two.
    TextArea ta = new TextArea();
    ta.setCharacterWidth(80);
    ta.setVisibleLines(50);

    // Add them to the root panel.
    VerticalPanel panel = new VerticalPanel();
    panel.add(tb);
    panel.add(ptb);
    panel.add(ta);
    RootPanel.get().add(panel);
  }
}

Nested Class Summary

Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.TextBoxBase

TextBoxBase.TextAlignConstant

Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.ValueBoxBase

ValueBoxBase.TextAlignment

Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject

UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled

Nested classes/interfaces inherited from interface com.google.gwt.i18n.client.HasDirection

HasDirection.Direction

Field Summary

Fields inherited from class com.google.gwt.user.client.ui.TextBoxBase

ALIGN_CENTER, ALIGN_JUSTIFY, ALIGN_LEFT, ALIGN_RIGHT

Fields inherited from class com.google.gwt.user.client.ui.Widget

eventsToSink

Fields inherited from class com.google.gwt.user.client.ui.UIObject

DEBUG_ID_PREFIX, MISSING_ELEMENT_ERROR, SETELEMENT_TWICE_ERROR

Constructor Summary

Constructors

Modifier	Constructor and Description
	TextArea() Creates an empty text area.
protected	TextArea(Element element) This constructor may be used by subclasses to explicitly use an existing element.

Method Summary

Modifier and Type	Method and Description
int	getCharacterWidth() Gets the requested width of the text box (this is not an exact value, as not all characters are created equal).
int	getCursorPos() Gets the current position of the cursor (this also serves as the beginning of the text selection).
int	getSelectionLength() Gets the length of the current text selection.
int	getVisibleLines() Gets the number of text lines that are visible.
void	setCharacterWidth(int width) Sets the requested width of the text box (this is not an exact value, as not all characters are created equal).
void	setVisibleLines(int lines) Sets the number of text lines that are visible.
static TextArea	wrap(Element element) Creates a TextArea widget that wraps an existing <textarea> element.

Methods inherited from class com.google.gwt.user.client.ui.TextBoxBase

addChangeListener, getValue, setTextAlignment

Methods inherited from class com.google.gwt.user.client.ui.ValueBoxBase

addChangeHandler, addValueChangeHandler, asEditor, cancelKey, getDirection, getDirectionEstimator, getImpl, getName, getSelectedText, getText, getValueOrThrow, isReadOnly, onBrowserEvent, onLoad, removeChangeListener, selectAll, setAlignment, setCursorPos, setDirection, setDirectionEstimator, setDirectionEstimator, setKey, setName, setReadOnly, setSelectionRange, setText, setValue, setValue

Methods inherited from class com.google.gwt.user.client.ui.FocusWidget

addBlurHandler, addClickHandler, addClickListener, addDoubleClickHandler, addDragEndHandler, addDragEnterHandler, addDragHandler, addDragLeaveHandler, addDragOverHandler, addDragStartHandler, addDropHandler, addFocusHandler, addFocusListener, addGestureChangeHandler, addGestureEndHandler, addGestureStartHandler, addKeyboardListener, addKeyDownHandler, addKeyPressHandler, addKeyUpHandler, addMouseDownHandler, addMouseListener, addMouseMoveHandler, addMouseOutHandler, addMouseOverHandler, addMouseUpHandler, addMouseWheelHandler, addMouseWheelListener, addTouchCancelHandler, addTouchEndHandler, addTouchMoveHandler, addTouchStartHandler, getFocusImpl, getTabIndex, isEnabled, onAttach, removeClickListener, removeFocusListener, removeKeyboardListener, removeMouseListener, removeMouseWheelListener, setAccessKey, setEnabled, setFocus, setTabIndex

Methods inherited from class com.google.gwt.user.client.ui.Widget

addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, doAttachChildren, doDetachChildren, ensureHandlers, fireEvent, getHandlerCount, getHandlerManager, getLayoutData, getParent, isAttached, isOrWasAttached, onDetach, onUnload, removeFromParent, replaceElement, setLayoutData, setParent, sinkEvents, unsinkEvents

Methods inherited from class com.google.gwt.user.client.ui.UIObject

addStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, resolvePotentialElement, setElement, setElement, setHeight, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setVisible, setWidth, sinkBitlessEvent, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.gwt.user.client.ui.SourcesChangeEvents

removeChangeListener

Methods inherited from interface com.google.gwt.event.dom.client.HasKeyUpHandlers

addKeyUpHandler

Methods inherited from interface com.google.gwt.event.shared.HasHandlers

fireEvent

Constructor Detail

TextArea

public TextArea()

Creates an empty text area.

TextArea

protected TextArea(Element element)

This constructor may be used by subclasses to explicitly use an existing element. This element must be a <textarea> element.

Parameters:

element - the element to be used

Method Detail

wrap

public static TextArea wrap(Element element)

Creates a TextArea widget that wraps an existing <textarea> element. This element must already be attached to the document. If the element is removed from the document, you must call RootPanel.detachNow(Widget).

Parameters:

element - the element to be wrapped

getCharacterWidth

public int getCharacterWidth()

Gets the requested width of the text box (this is not an exact value, as not all characters are created equal).

Returns:

the requested width, in characters

getCursorPos

public int getCursorPos()

Description copied from class: ValueBoxBase

Gets the current position of the cursor (this also serves as the beginning of the text selection).

Overrides:

getCursorPos in class ValueBoxBase<java.lang.String>

Returns:

the cursor's position

getSelectionLength

public int getSelectionLength()

Description copied from class: ValueBoxBase

Gets the length of the current text selection.

Overrides:

getSelectionLength in class ValueBoxBase<java.lang.String>

Returns:

the text selection length

getVisibleLines

public int getVisibleLines()

Gets the number of text lines that are visible.

Returns:

the number of visible lines

setCharacterWidth

public void setCharacterWidth(int width)

Sets the requested width of the text box (this is not an exact value, as not all characters are created equal).

Parameters:

width - the requested width, in characters

setVisibleLines

public void setVisibleLines(int lines)

Sets the number of text lines that are visible.

Parameters:

lines - the number of visible lines