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TextField.java
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/*
* @(#)TextField.java 1.17 96/04/01 Sami Shaio
*
* Copyright (c) 1994-1995 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
package java.awt;
import java.awt.peer.TextFieldPeer;
/**
* TextField is a component that allows the editing of a single line of text.
*
* @version 1.17, 01 Apr 1996
* @author Sami Shaio
*/
public class TextField extends TextComponent {
/**
* The number of columns in the TextField.
*/
int cols;
/**
* The echo character.
*/
char echoChar;
/**
* Constructs a new TextField.
*/
public TextField() {
super("");
}
/**
* Constructs a new TextField initialized with the specified columns.
* @param cols the number of columns
*/
public TextField(int cols) {
super("");
this.cols = cols;
}
/**
* Constructs a new TextField initialized with the specified text.
* @param text the text to be displayed
*/
public TextField(String text) {
super(text);
}
/**
* Constructs a new TextField initialized with the specified text and columns.
* @param text the text to be displayed
* @param cols the number of columns
*/
public TextField(String text, int cols) {
super(text);
this.cols = cols;
}
/**
* Creates the TextField's peer. The peer allows us to modify the appearance of
* the TextField without changing its functionality.
*/
public synchronized void addNotify() {
peer = getToolkit().createTextField(this);
super.addNotify();
}
/**
* Returns the character to be used for echoing.
* @see #setEchoCharacter
* @see #echoCharIsSet
*/
public char getEchoChar() {
return echoChar;
}
/**
* Returns true if this TextField has a character set for
* echoing.
* @see #setEchoCharacter
* @see #getEchoChar
*/
public boolean echoCharIsSet() {
return echoChar != 0;
}
/**
* Returns the number of columns in this TextField.
*/
public int getColumns() {
return cols;
}
/**
* Sets the echo character for this TextField. This is useful
* for fields where the user input shouldn't be echoed to the screen,
* as in the case of a TextField that represents a password.
* @param c the echo character for this TextField
* @see #echoCharIsSet
* @see #getEchoChar
*/
public void setEchoCharacter(char c) {
echoChar = c;
TextFieldPeer peer = (TextFieldPeer)this.peer;
if (peer != null) {
peer.setEchoCharacter(c);
}
}
/**
* Returns the preferred size Dimensions needed for this TextField with the
* specified amount of columns.
* @param cols the number of columns in this TextField
*/
public Dimension preferredSize(int cols) {
TextFieldPeer peer = (TextFieldPeer)this.peer;
return (peer != null) ? peer.preferredSize(cols) : super.preferredSize();
}
/**
* Returns the preferred size Dimensions needed for this TextField.
*/
public Dimension preferredSize() {
return (cols > 0) ? preferredSize(cols) : super.preferredSize();
}
/**
* Returns the minimum size Dimensions needed for this TextField with the specified
* amount of columns.
* @param cols the number of columns in this TextField
*/
public Dimension minimumSize(int cols) {
TextFieldPeer peer = (TextFieldPeer)this.peer;
return (peer != null) ? peer.minimumSize(cols) : super.minimumSize();
}
/**
* Returns the minimum size Dimensions needed for this TextField.
*/
public Dimension minimumSize() {
return (cols > 0) ? minimumSize(cols) : super.minimumSize();
}
/**
* Returns the String of parameters for this TExtField.
*/
protected String paramString() {
String str = super.paramString();
if (echoChar != 0) {
str += ",echo=" + echoChar;
}
return str;
}
/* Can this field be tabbed to? */
boolean tabbable() {
return true;
}
}