/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import javax.accessibility.*;
/**
* A <code>TextField</code> object is a text component
* that allows for the editing of a single line of text.
* <p>
* For example, the following image depicts a frame with four
* text fields of varying widths. Two of these text fields
* display the predefined text <code>"Hello"</code>.
* <p>
* <img src="doc-files/TextField-1.gif" alt="The preceding text describes this image."
* ALIGN=center HSPACE=10 VSPACE=7>
* <p>
* Here is the code that produces these four text fields:
* <p>
* <hr><blockquote><pre>
* TextField tf1, tf2, tf3, tf4;
* // a blank text field
* tf1 = new TextField();
* // blank field of 20 columns
* tf2 = new TextField("", 20);
* // predefined text displayed
* tf3 = new TextField("Hello!");
* // predefined text in 30 columns
* tf4 = new TextField("Hello", 30);
* </pre></blockquote><hr>
* <p>
* Every time the user types a key in the text field, one or
* more key events are sent to the text field. A <code>KeyEvent</code>
* may be one of three types: keyPressed, keyReleased, or keyTyped.
* The properties of a key event indicate which of these types
* it is, as well as additional information about the event,
* such as what modifiers are applied to the key event and the
* time at which the event occurred.
* <p>
* The key event is passed to every <code>KeyListener</code>
* or <code>KeyAdapter</code> object which registered to receive such
* events using the component's <code>addKeyListener</code> method.
* (<code>KeyAdapter</code> objects implement the
* <code>KeyListener</code> interface.)
* <p>
* It is also possible to fire an <code>ActionEvent</code>.
* If action events are enabled for the text field, they may
* be fired by pressing the <code>Return</code> key.
* <p>
* The <code>TextField</code> class's <code>processEvent</code>
* method examines the action event and passes it along to
* <code>processActionEvent</code>. The latter method redirects the
* event to any <code>ActionListener</code> objects that have
* registered to receive action events generated by this
* text field.
*
* @author Sami Shaio
* @see java.awt.event.KeyEvent
* @see java.awt.event.KeyAdapter
* @see java.awt.event.KeyListener
* @see java.awt.event.ActionEvent
* @see java.awt.Component#addKeyListener
* @see java.awt.TextField#processEvent
* @see java.awt.TextField#processActionEvent
* @see java.awt.TextField#addActionListener
* @since JDK1.0
*/
/**
* The number of columns in the text field.
* A column is an approximate average character
* width that is platform-dependent.
* Guaranteed to be non-negative.
*
* @serial
* @see #setColumns(int)
* @see #getColumns()
*/
int columns;
/**
* The echo character, which is used when
* the user wishes to disguise the characters
* typed into the text field.
* The disguises are removed if echoChar = <code>0</code>.
*
* @serial
* @see #getEchoChar()
* @see #setEchoChar(char)
* @see #echoCharIsSet()
*/
char echoChar;
/*
* JDK 1.1 serialVersionUID
*/
/**
* Initialize JNI field and method ids
*/
private static native void initIDs();
static {
/* ensure that the necessary native libraries are loaded */
if (!GraphicsEnvironment.isHeadless()) {
initIDs();
}
}
/**
* Constructs a new text field.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
this("", 0);
}
/**
* Constructs a new text field initialized with the specified text.
* @param text the text to be displayed. If
* <code>text</code> is <code>null</code>, the empty
* string <code>""</code> will be displayed.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
}
/**
* Constructs a new empty text field with the specified number
* of columns. A column is an approximate average character
* width that is platform-dependent.
* @param columns the number of columns. If
* <code>columns</code> is less than <code>0</code>,
* <code>columns</code> is set to <code>0</code>.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
this("", columns);
}
/**
* Constructs a new text field initialized with the specified text
* to be displayed, and wide enough to hold the specified
* number of columns. A column is an approximate average character
* width that is platform-dependent.
* @param text the text to be displayed. If
* <code>text</code> is <code>null</code>, the empty
* string <code>""</code> will be displayed.
* @param columns the number of columns. If
* <code>columns</code> is less than <code>0</code>,
* <code>columns</code> is set to <code>0</code>.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
super(text);
}
/**
* Construct a name for this component. Called by getName() when the
* name is null.
*/
synchronized (TextField.class) {
return base + nameCounter++;
}
}
/**
* Creates the TextField's peer. The peer allows us to modify the
* appearance of the TextField without changing its functionality.
*/
public void addNotify() {
synchronized (getTreeLock()) {
super.addNotify();
}
}
/**
* Gets the character that is to be used for echoing.
* <p>
* An echo character is useful for text fields where
* user input should not be echoed to the screen, as in
* the case of a text field for entering a password.
* If <code>echoChar</code> = <code>0</code>, user
* input is echoed to the screen unchanged.
* <p>
* A Java platform implementation may support only a limited,
* non-empty set of echo characters. This function returns the
* echo character originally requested via setEchoChar(). The echo
* character actually used by the TextField implementation might be
* different.
* @return the echo character for this text field.
* @see java.awt.TextField#echoCharIsSet
* @see java.awt.TextField#setEchoChar
*/
public char getEchoChar() {
return echoChar;
}
/**
* Sets the echo character for this text field.
* <p>
* An echo character is useful for text fields where
* user input should not be echoed to the screen, as in
* the case of a text field for entering a password.
* Setting <code>echoChar</code> = <code>0</code> allows
* user input to be echoed to the screen again.
* <p>
* A Java platform implementation may support only a limited,
* non-empty set of echo characters. Attempts to set an
* unsupported echo character will cause the default echo
* character to be used instead. Subsequent calls to getEchoChar()
* will return the echo character originally requested. This might
* or might not be identical to the echo character actually
* used by the TextField implementation.
* @param c the echo character for this text field.
* @see java.awt.TextField#echoCharIsSet
* @see java.awt.TextField#getEchoChar
* @since JDK1.1
*/
public void setEchoChar(char c) {
setEchoCharacter(c);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setEchoChar(char)</code>.
*/
public synchronized void setEchoCharacter(char c) {
if (echoChar != c) {
echoChar = c;
peer.setEchoChar(c);
}
}
}
/**
* Sets the text that is presented by this
* text component to be the specified text.
* @param t the new text.
* @see java.awt.TextComponent#getText
*/
super.setText(t);
// This could change the preferred size of the Component.
}
/**
* Indicates whether or not this text field has a
* character set for echoing.
* <p>
* An echo character is useful for text fields where
* user input should not be echoed to the screen, as in
* the case of a text field for entering a password.
* @return <code>true</code> if this text field has
* a character set for echoing;
* <code>false</code> otherwise.
* @see java.awt.TextField#setEchoChar
* @see java.awt.TextField#getEchoChar
*/
public boolean echoCharIsSet() {
return echoChar != 0;
}
/**
* Gets the number of columns in this text field. A column is an
* approximate average character width that is platform-dependent.
* @return the number of columns.
* @see java.awt.TextField#setColumns
* @since JDK1.1
*/
public int getColumns() {
return columns;
}
/**
* Sets the number of columns in this text field. A column is an
* approximate average character width that is platform-dependent.
* @param columns the number of columns.
* @see java.awt.TextField#getColumns
* @exception IllegalArgumentException if the value
* supplied for <code>columns</code>
* is less than <code>0</code>.
* @since JDK1.1
*/
int oldVal;
synchronized (this) {
if (columns < 0) {
throw new IllegalArgumentException("columns less than zero.");
}
}
}
invalidate();
}
}
/**
* Gets the preferred size of this text field
* with the specified number of columns.
* @param columns the number of columns
* in this text field.
* @return the preferred dimensions for
* displaying this text field.
* @since JDK1.1
*/
return preferredSize(columns);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getPreferredSize(int)</code>.
*/
synchronized (getTreeLock()) {
super.preferredSize();
}
}
/**
* Gets the preferred size of this text field.
* @return the preferred dimensions for
* displaying this text field.
* @since JDK1.1
*/
return preferredSize();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getPreferredSize()</code>.
*/
synchronized (getTreeLock()) {
return (columns > 0) ?
super.preferredSize();
}
}
/**
* Gets the minumum dimensions for a text field with
* the specified number of columns.
* @param columns the number of columns in
* this text field.
* @since JDK1.1
*/
return minimumSize(columns);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getMinimumSize(int)</code>.
*/
synchronized (getTreeLock()) {
super.minimumSize();
}
}
/**
* Gets the minumum dimensions for this text field.
* @return the minimum dimensions for
* displaying this text field.
* @since JDK1.1
*/
return minimumSize();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getMinimumSize()</code>.
*/
synchronized (getTreeLock()) {
return (columns > 0) ?
super.minimumSize();
}
}
/**
* Adds the specified action listener to receive
* action events from this text field.
* If l is null, no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the action listener.
* @see #removeActionListener
* @see #getActionListeners
* @see java.awt.event.ActionListener
* @since JDK1.1
*/
if (l == null) {
return;
}
newEventsOnly = true;
}
/**
* Removes the specified action listener so that it no longer
* receives action events from this text field.
* If l is null, no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the action listener.
* @see #addActionListener
* @see #getActionListeners
* @see java.awt.event.ActionListener
* @since JDK1.1
*/
if (l == null) {
return;
}
}
/**
* Returns an array of all the action listeners
* registered on this textfield.
*
* @return all of this textfield's <code>ActionListener</code>s
* or an empty array if no action
* listeners are currently registered
*
* @see #addActionListener
* @see #removeActionListener
* @see java.awt.event#ActionListener
* @since 1.4
*/
}
/**
* Returns an array of all the objects currently registered
* as <code><em>Foo</em>Listener</code>s
* upon this <code>TextField</code>.
* <code><em>Foo</em>Listener</code>s are registered using the
* <code>add<em>Foo</em>Listener</code> method.
*
* <p>
* You can specify the <code>listenerType</code> argument
* with a class literal, such as
* <code><em>Foo</em>Listener.class</code>.
* For example, you can query a
* <code>TextField</code> <code>t</code>
* for its action listeners with the following code:
*
* <pre>ActionListener[] als = (ActionListener[])(t.getListeners(ActionListener.class));</pre>
*
* If no such listeners exist, this method returns an empty array.
*
* @param listenerType the type of listeners requested; this parameter
* should specify an interface that descends from
* <code>java.util.EventListener</code>
* @return an array of all objects registered as
* <code><em>Foo</em>Listener</code>s on this textfield,
* or an empty array if no such
* listeners have been added
* @exception ClassCastException if <code>listenerType</code>
* doesn't specify a class or interface that implements
* <code>java.util.EventListener</code>
*
* @see #getActionListeners
* @since 1.3
*/
EventListener l = null;
if (listenerType == ActionListener.class) {
l = actionListener;
} else {
return super.getListeners(listenerType);
}
}
// REMIND: remove when filtering is done at lower level
actionListener != null) {
return true;
}
return false;
}
return super.eventEnabled(e);
}
/**
* Processes events on this text field. If the event
* is an instance of <code>ActionEvent</code>,
* it invokes the <code>processActionEvent</code>
* method. Otherwise, it invokes <code>processEvent</code>
* on the superclass.
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the event
* @see java.awt.event.ActionEvent
* @see java.awt.TextField#processActionEvent
* @since JDK1.1
*/
if (e instanceof ActionEvent) {
return;
}
super.processEvent(e);
}
/**
* Processes action events occurring on this text field by
* dispatching them to any registered
* <code>ActionListener</code> objects.
* <p>
* This method is not called unless action events are
* enabled for this component. Action events are enabled
* when one of the following occurs:
* <p><ul>
* <li>An <code>ActionListener</code> object is registered
* via <code>addActionListener</code>.
* <li>Action events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the action event
* @see java.awt.event.ActionListener
* @see java.awt.TextField#addActionListener
* @see java.awt.Component#enableEvents
* @since JDK1.1
*/
}
}
/**
* Returns a string representing the state of this <code>TextField</code>.
* This method is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not be
* <code>null</code>.
*
* @return the parameter string of this text field
*/
if (echoChar != 0) {
}
return str;
}
/*
* Serialization support.
*/
/**
* The textField Serialized Data Version.
*
* @serial
*/
/**
* Writes default serializable fields to stream. Writes
* a list of serializable ActionListener(s) as optional data.
* The non-serializable ActionListener(s) are detected and
* no attempt is made to serialize them.
*
* @serialData Null terminated sequence of zero or more pairs.
* A pair consists of a String and Object.
* The String indicates the type of object and
* is one of the following :
* ActionListenerK indicating and ActionListener object.
*
* @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener)
* @see java.awt.Component#actionListenerK
*/
throws IOException
{
s.defaultWriteObject();
s.writeObject(null);
}
/**
* Read the ObjectInputStream and if it isn't null,
* add a listener to receive action events fired by the
* TextField. Unrecognized keys or values will be
* ignored.
*
* @exception HeadlessException if
* <code>GraphicsEnvironment.isHeadless()</code> returns
* <code>true</code>
* @see #removeActionListener(ActionListener)
* @see #addActionListener(ActionListener)
* @see java.awt.GraphicsEnvironment#isHeadless
*/
{
// HeadlessException will be thrown by TextComponent's readObject
s.defaultReadObject();
// Make sure the state we just read in for columns has legal values
if (columns < 0) {
columns = 0;
}
// Read in listeners, if any
if (actionListenerK == key) {
} else {
// skip value for unrecognized key
s.readObject();
}
}
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the AccessibleContext associated with this TextField.
* For text fields, the AccessibleContext takes the form of an
* AccessibleAWTTextField.
* A new AccessibleAWTTextField instance is created if necessary.
*
* @return an AccessibleAWTTextField that serves as the
* AccessibleContext of this TextField
* @since 1.3
*/
if (accessibleContext == null) {
accessibleContext = new AccessibleAWTTextField();
}
return accessibleContext;
}
/**
* This class implements accessibility support for the
* <code>TextField</code> class. It provides an implementation of the
* Java Accessibility API appropriate to text field user-interface elements.
* @since 1.3
*/
{
/*
* JDK 1.3 serialVersionUID
*/
/**
* Gets the state set of this object.
*
* @return an instance of AccessibleStateSet describing the states
* of the object
* @see AccessibleState
*/
return states;
}
}
}