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762 lines
25 KiB
762 lines
25 KiB
/*
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* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.awt;
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import java.awt.peer.TextFieldPeer;
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import java.awt.event.*;
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import java.util.EventListener;
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import java.io.ObjectOutputStream;
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import java.io.ObjectInputStream;
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import java.io.IOException;
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import javax.accessibility.*;
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/**
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* A <code>TextField</code> object is a text component
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* that allows for the editing of a single line of text.
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* <p>
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* For example, the following image depicts a frame with four
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* text fields of varying widths. Two of these text fields
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* display the predefined text <code>"Hello"</code>.
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* <p>
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* <img src="doc-files/TextField-1.gif" alt="The preceding text describes this image."
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* style="float:center; margin: 7px 10px;">
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* <p>
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* Here is the code that produces these four text fields:
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*
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* <hr><blockquote><pre>
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* TextField tf1, tf2, tf3, tf4;
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* // a blank text field
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* tf1 = new TextField();
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* // blank field of 20 columns
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* tf2 = new TextField("", 20);
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* // predefined text displayed
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* tf3 = new TextField("Hello!");
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* // predefined text in 30 columns
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* tf4 = new TextField("Hello", 30);
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* </pre></blockquote><hr>
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* <p>
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* Every time the user types a key in the text field, one or
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* more key events are sent to the text field. A <code>KeyEvent</code>
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* may be one of three types: keyPressed, keyReleased, or keyTyped.
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* The properties of a key event indicate which of these types
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* it is, as well as additional information about the event,
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* such as what modifiers are applied to the key event and the
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* time at which the event occurred.
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* <p>
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* The key event is passed to every <code>KeyListener</code>
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* or <code>KeyAdapter</code> object which registered to receive such
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* events using the component's <code>addKeyListener</code> method.
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* (<code>KeyAdapter</code> objects implement the
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* <code>KeyListener</code> interface.)
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* <p>
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* It is also possible to fire an <code>ActionEvent</code>.
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* If action events are enabled for the text field, they may
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* be fired by pressing the <code>Return</code> key.
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* <p>
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* The <code>TextField</code> class's <code>processEvent</code>
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* method examines the action event and passes it along to
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* <code>processActionEvent</code>. The latter method redirects the
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* event to any <code>ActionListener</code> objects that have
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* registered to receive action events generated by this
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* text field.
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*
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* @author Sami Shaio
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* @see java.awt.event.KeyEvent
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* @see java.awt.event.KeyAdapter
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* @see java.awt.event.KeyListener
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* @see java.awt.event.ActionEvent
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* @see java.awt.Component#addKeyListener
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* @see java.awt.TextField#processEvent
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* @see java.awt.TextField#processActionEvent
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* @see java.awt.TextField#addActionListener
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* @since JDK1.0
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*/
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public class TextField extends TextComponent {
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/**
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* The number of columns in the text field.
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* A column is an approximate average character
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* width that is platform-dependent.
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* Guaranteed to be non-negative.
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*
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* @serial
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* @see #setColumns(int)
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* @see #getColumns()
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*/
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int columns;
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/**
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* The echo character, which is used when
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* the user wishes to disguise the characters
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* typed into the text field.
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* The disguises are removed if echoChar = <code>0</code>.
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*
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* @serial
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* @see #getEchoChar()
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* @see #setEchoChar(char)
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* @see #echoCharIsSet()
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*/
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char echoChar;
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transient ActionListener actionListener;
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private static final String base = "textfield";
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private static int nameCounter = 0;
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/*
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* JDK 1.1 serialVersionUID
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*/
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private static final long serialVersionUID = -2966288784432217853L;
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/**
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* Initialize JNI field and method ids
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*/
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private static native void initIDs();
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static {
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/* ensure that the necessary native libraries are loaded */
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Toolkit.loadLibraries();
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if (!GraphicsEnvironment.isHeadless()) {
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initIDs();
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}
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}
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/**
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* Constructs a new text field.
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* @exception HeadlessException if GraphicsEnvironment.isHeadless()
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* returns true.
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* @see java.awt.GraphicsEnvironment#isHeadless
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*/
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public TextField() throws HeadlessException {
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this("", 0);
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}
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/**
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* Constructs a new text field initialized with the specified text.
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* @param text the text to be displayed. If
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* <code>text</code> is <code>null</code>, the empty
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* string <code>""</code> will be displayed.
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* @exception HeadlessException if GraphicsEnvironment.isHeadless()
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* returns true.
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* @see java.awt.GraphicsEnvironment#isHeadless
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*/
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public TextField(String text) throws HeadlessException {
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this(text, (text != null) ? text.length() : 0);
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}
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/**
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* Constructs a new empty text field with the specified number
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* of columns. A column is an approximate average character
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* width that is platform-dependent.
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* @param columns the number of columns. If
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* <code>columns</code> is less than <code>0</code>,
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* <code>columns</code> is set to <code>0</code>.
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* @exception HeadlessException if GraphicsEnvironment.isHeadless()
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* returns true.
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* @see java.awt.GraphicsEnvironment#isHeadless
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*/
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public TextField(int columns) throws HeadlessException {
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this("", columns);
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}
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/**
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* Constructs a new text field initialized with the specified text
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* to be displayed, and wide enough to hold the specified
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* number of columns. A column is an approximate average character
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* width that is platform-dependent.
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* @param text the text to be displayed. If
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* <code>text</code> is <code>null</code>, the empty
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* string <code>""</code> will be displayed.
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* @param columns the number of columns. If
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* <code>columns</code> is less than <code>0</code>,
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* <code>columns</code> is set to <code>0</code>.
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* @exception HeadlessException if GraphicsEnvironment.isHeadless()
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* returns true.
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* @see java.awt.GraphicsEnvironment#isHeadless
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*/
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public TextField(String text, int columns) throws HeadlessException {
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super(text);
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this.columns = (columns >= 0) ? columns : 0;
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}
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/**
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* Construct a name for this component. Called by getName() when the
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* name is null.
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*/
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String constructComponentName() {
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synchronized (TextField.class) {
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return base + nameCounter++;
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}
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}
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/**
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* Creates the TextField's peer. The peer allows us to modify the
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* appearance of the TextField without changing its functionality.
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*/
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public void addNotify() {
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synchronized (getTreeLock()) {
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if (peer == null)
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peer = getToolkit().createTextField(this);
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super.addNotify();
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}
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}
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/**
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* Gets the character that is to be used for echoing.
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* <p>
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* An echo character is useful for text fields where
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* user input should not be echoed to the screen, as in
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* the case of a text field for entering a password.
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* If <code>echoChar</code> = <code>0</code>, user
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* input is echoed to the screen unchanged.
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* <p>
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* A Java platform implementation may support only a limited,
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* non-empty set of echo characters. This function returns the
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* echo character originally requested via setEchoChar(). The echo
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* character actually used by the TextField implementation might be
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* different.
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* @return the echo character for this text field.
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* @see java.awt.TextField#echoCharIsSet
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* @see java.awt.TextField#setEchoChar
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*/
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public char getEchoChar() {
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return echoChar;
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}
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/**
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* Sets the echo character for this text field.
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* <p>
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* An echo character is useful for text fields where
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* user input should not be echoed to the screen, as in
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* the case of a text field for entering a password.
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* Setting <code>echoChar</code> = <code>0</code> allows
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* user input to be echoed to the screen again.
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* <p>
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* A Java platform implementation may support only a limited,
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* non-empty set of echo characters. Attempts to set an
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* unsupported echo character will cause the default echo
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* character to be used instead. Subsequent calls to getEchoChar()
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* will return the echo character originally requested. This might
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* or might not be identical to the echo character actually
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* used by the TextField implementation.
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* @param c the echo character for this text field.
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* @see java.awt.TextField#echoCharIsSet
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* @see java.awt.TextField#getEchoChar
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* @since JDK1.1
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*/
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public void setEchoChar(char c) {
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setEchoCharacter(c);
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}
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/**
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* @deprecated As of JDK version 1.1,
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* replaced by <code>setEchoChar(char)</code>.
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*/
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@Deprecated
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public synchronized void setEchoCharacter(char c) {
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if (echoChar != c) {
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echoChar = c;
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TextFieldPeer peer = (TextFieldPeer)this.peer;
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if (peer != null) {
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peer.setEchoChar(c);
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}
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}
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}
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/**
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* Sets the text that is presented by this
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* text component to be the specified text.
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* @param t the new text.
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* @see java.awt.TextComponent#getText
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*/
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public void setText(String t) {
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super.setText(t);
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// This could change the preferred size of the Component.
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invalidateIfValid();
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}
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/**
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* Indicates whether or not this text field has a
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* character set for echoing.
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* <p>
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* An echo character is useful for text fields where
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* user input should not be echoed to the screen, as in
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* the case of a text field for entering a password.
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* @return <code>true</code> if this text field has
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* a character set for echoing;
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* <code>false</code> otherwise.
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* @see java.awt.TextField#setEchoChar
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* @see java.awt.TextField#getEchoChar
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*/
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public boolean echoCharIsSet() {
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return echoChar != 0;
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}
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/**
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* Gets the number of columns in this text field. A column is an
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* approximate average character width that is platform-dependent.
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* @return the number of columns.
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* @see java.awt.TextField#setColumns
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* @since JDK1.1
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*/
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public int getColumns() {
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return columns;
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}
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/**
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* Sets the number of columns in this text field. A column is an
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* approximate average character width that is platform-dependent.
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* @param columns the number of columns.
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* @see java.awt.TextField#getColumns
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* @exception IllegalArgumentException if the value
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* supplied for <code>columns</code>
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* is less than <code>0</code>.
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* @since JDK1.1
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*/
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public void setColumns(int columns) {
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int oldVal;
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synchronized (this) {
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oldVal = this.columns;
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if (columns < 0) {
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throw new IllegalArgumentException("columns less than zero.");
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}
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if (columns != oldVal) {
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this.columns = columns;
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}
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}
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if (columns != oldVal) {
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invalidate();
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}
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}
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/**
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* Gets the preferred size of this text field
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* with the specified number of columns.
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* @param columns the number of columns
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* in this text field.
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* @return the preferred dimensions for
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* displaying this text field.
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* @since JDK1.1
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*/
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public Dimension getPreferredSize(int columns) {
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return preferredSize(columns);
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}
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/**
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* @deprecated As of JDK version 1.1,
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* replaced by <code>getPreferredSize(int)</code>.
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*/
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@Deprecated
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public Dimension preferredSize(int columns) {
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synchronized (getTreeLock()) {
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TextFieldPeer peer = (TextFieldPeer)this.peer;
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return (peer != null) ?
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peer.getPreferredSize(columns) :
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super.preferredSize();
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}
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}
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/**
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* Gets the preferred size of this text field.
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* @return the preferred dimensions for
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* displaying this text field.
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* @since JDK1.1
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*/
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public Dimension getPreferredSize() {
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return preferredSize();
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}
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/**
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* @deprecated As of JDK version 1.1,
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* replaced by <code>getPreferredSize()</code>.
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*/
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@Deprecated
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public Dimension preferredSize() {
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synchronized (getTreeLock()) {
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return (columns > 0) ?
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preferredSize(columns) :
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super.preferredSize();
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}
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}
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/**
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* Gets the minimum dimensions for a text field with
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* the specified number of columns.
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* @param columns the number of columns in
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* this text field.
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* @since JDK1.1
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*/
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public Dimension getMinimumSize(int columns) {
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return minimumSize(columns);
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}
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/**
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* @deprecated As of JDK version 1.1,
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* replaced by <code>getMinimumSize(int)</code>.
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*/
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@Deprecated
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public Dimension minimumSize(int columns) {
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synchronized (getTreeLock()) {
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TextFieldPeer peer = (TextFieldPeer)this.peer;
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return (peer != null) ?
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peer.getMinimumSize(columns) :
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super.minimumSize();
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}
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}
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/**
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* Gets the minimum dimensions for this text field.
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* @return the minimum dimensions for
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* displaying this text field.
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* @since JDK1.1
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*/
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public Dimension getMinimumSize() {
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return minimumSize();
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}
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/**
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* @deprecated As of JDK version 1.1,
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* replaced by <code>getMinimumSize()</code>.
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*/
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@Deprecated
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public Dimension minimumSize() {
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synchronized (getTreeLock()) {
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return (columns > 0) ?
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minimumSize(columns) :
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super.minimumSize();
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}
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}
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/**
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* Adds the specified action listener to receive
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* action events from this text field.
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* If l is null, no exception is thrown and no action is performed.
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* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
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* >AWT Threading Issues</a> for details on AWT's threading model.
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*
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* @param l the action listener.
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* @see #removeActionListener
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* @see #getActionListeners
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* @see java.awt.event.ActionListener
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* @since JDK1.1
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*/
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public synchronized void addActionListener(ActionListener l) {
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if (l == null) {
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return;
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}
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actionListener = AWTEventMulticaster.add(actionListener, l);
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newEventsOnly = true;
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}
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/**
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* Removes the specified action listener so that it no longer
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* receives action events from this text field.
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* If l is null, no exception is thrown and no action is performed.
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* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
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* >AWT Threading Issues</a> for details on AWT's threading model.
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*
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* @param l the action listener.
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* @see #addActionListener
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* @see #getActionListeners
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* @see java.awt.event.ActionListener
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* @since JDK1.1
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*/
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public synchronized void removeActionListener(ActionListener l) {
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if (l == null) {
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return;
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}
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actionListener = AWTEventMulticaster.remove(actionListener, l);
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}
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/**
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* Returns an array of all the action listeners
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* registered on this textfield.
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*
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* @return all of this textfield's <code>ActionListener</code>s
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* or an empty array if no action
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* listeners are currently registered
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*
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* @see #addActionListener
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* @see #removeActionListener
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* @see java.awt.event.ActionListener
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* @since 1.4
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*/
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public synchronized ActionListener[] getActionListeners() {
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return getListeners(ActionListener.class);
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}
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/**
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* Returns an array of all the objects currently registered
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* as <code><em>Foo</em>Listener</code>s
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* upon this <code>TextField</code>.
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* <code><em>Foo</em>Listener</code>s are registered using the
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* <code>add<em>Foo</em>Listener</code> method.
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*
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* <p>
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* You can specify the <code>listenerType</code> argument
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* with a class literal, such as
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* <code><em>Foo</em>Listener.class</code>.
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* For example, you can query a
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* <code>TextField</code> <code>t</code>
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* for its action listeners with the following code:
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*
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* <pre>ActionListener[] als = (ActionListener[])(t.getListeners(ActionListener.class));</pre>
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*
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* If no such listeners exist, this method returns an empty array.
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*
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* @param listenerType the type of listeners requested; this parameter
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* should specify an interface that descends from
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* <code>java.util.EventListener</code>
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* @return an array of all objects registered as
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* <code><em>Foo</em>Listener</code>s on this textfield,
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* or an empty array if no such
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* listeners have been added
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* @exception ClassCastException if <code>listenerType</code>
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* doesn't specify a class or interface that implements
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* <code>java.util.EventListener</code>
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*
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* @see #getActionListeners
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* @since 1.3
|
|
*/
|
|
public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
|
|
EventListener l = null;
|
|
if (listenerType == ActionListener.class) {
|
|
l = actionListener;
|
|
} else {
|
|
return super.getListeners(listenerType);
|
|
}
|
|
return AWTEventMulticaster.getListeners(l, listenerType);
|
|
}
|
|
|
|
// REMIND: remove when filtering is done at lower level
|
|
boolean eventEnabled(AWTEvent e) {
|
|
if (e.id == ActionEvent.ACTION_PERFORMED) {
|
|
if ((eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 ||
|
|
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
|
|
*/
|
|
protected void processEvent(AWTEvent e) {
|
|
if (e instanceof ActionEvent) {
|
|
processActionEvent((ActionEvent)e);
|
|
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:
|
|
* <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
|
|
*/
|
|
protected void processActionEvent(ActionEvent e) {
|
|
ActionListener listener = actionListener;
|
|
if (listener != null) {
|
|
listener.actionPerformed(e);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
protected String paramString() {
|
|
String str = super.paramString();
|
|
if (echoChar != 0) {
|
|
str += ",echo=" + echoChar;
|
|
}
|
|
return str;
|
|
}
|
|
|
|
|
|
/*
|
|
* Serialization support.
|
|
*/
|
|
/**
|
|
* The textField Serialized Data Version.
|
|
*
|
|
* @serial
|
|
*/
|
|
private int textFieldSerializedDataVersion = 1;
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
private void writeObject(ObjectOutputStream s)
|
|
throws IOException
|
|
{
|
|
s.defaultWriteObject();
|
|
|
|
AWTEventMulticaster.save(s, actionListenerK, actionListener);
|
|
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
|
|
*/
|
|
private void readObject(ObjectInputStream s)
|
|
throws ClassNotFoundException, IOException, HeadlessException
|
|
{
|
|
// 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
|
|
Object keyOrNull;
|
|
while(null != (keyOrNull = s.readObject())) {
|
|
String key = ((String)keyOrNull).intern();
|
|
|
|
if (actionListenerK == key) {
|
|
addActionListener((ActionListener)(s.readObject()));
|
|
} 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
|
|
*/
|
|
public AccessibleContext getAccessibleContext() {
|
|
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
|
|
*/
|
|
protected class AccessibleAWTTextField extends AccessibleAWTTextComponent
|
|
{
|
|
/*
|
|
* JDK 1.3 serialVersionUID
|
|
*/
|
|
private static final long serialVersionUID = 6219164359235943158L;
|
|
|
|
/**
|
|
* Gets the state set of this object.
|
|
*
|
|
* @return an instance of AccessibleStateSet describing the states
|
|
* of the object
|
|
* @see AccessibleState
|
|
*/
|
|
public AccessibleStateSet getAccessibleStateSet() {
|
|
AccessibleStateSet states = super.getAccessibleStateSet();
|
|
states.add(AccessibleState.SINGLE_LINE);
|
|
return states;
|
|
}
|
|
}
|
|
|
|
}
|