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The Java Library
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You can control whether the contents of a text field may be modified by the user by calling setEditable( ) You can determine editability by calling isEditable( ) These methods are shown here: boolean isEditable( ) void setEditable(boolean canEdit) isEditable( ) returns true if the text may be changed and false if not In setEditable( ), if canEdit is true, the text may be changed If it is false, the text cannot be altered There may be times when you will want the user to enter text that is not displayed, such as a password You can disable the echoing of the characters as they are typed by calling setEchoChar( ) This method specifies a single character that the TextField will display when characters are entered (thus, the actual characters typed will not be shown) You can check a text field to see if it is in this mode with the echoCharIsSet( ) method You can retrieve the echo character by calling the getEchoChar( ) method These methods are as follows: void setEchoChar(char ch) boolean echoCharIsSet( ) char getEchoChar( ) Here, ch specifies the character to be echoed
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Handling a TextField
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Since text fields perform their own editing functions, your program generally will not respond to individual key events that occur within a text field However, you may want to respond when the user presses ENTER When this occurs, an action event is generated Here is an example that creates the classic user name and password screen:
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// Demonstrate text field import javaawt*; import javaawtevent*; import javaapplet*; /* <applet code="TextFieldDemo" width=380 height=150> </applet> */ public class TextFieldDemo extends Applet implements ActionListener { TextField name, pass; public void init() { Label namep = new Label("Name: ", LabelRIGHT); Label passp = new Label("Password: ", LabelRIGHT); name = new TextField(12); pass = new TextField(8); passsetEchoChar(' '); add(namep);
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add(name); add(passp); add(pass); // register to receive action events nameaddActionListener(this); passaddActionListener(this); } // User pressed Enter public void actionPerformed(ActionEvent ae) { repaint(); } public void paint(Graphics g) { gdrawString("Name: " + namegetText(), 6, 60); gdrawString("Selected text in name: " + namegetSelectedText(), 6, 80); gdrawString("Password: " + passgetText(), 6, 100); } }
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Sample output from the TextFieldDemo applet is shown in Figure 24-7
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Sometimes a single line of text input is not enough for a given task To handle these situations, the AWT includes a simple multiline editor called TextArea Following are the constructors for TextArea: TextArea( ) throws HeadlessException TextArea(int numLines, int numChars) throws HeadlessException TextArea(String str) throws HeadlessException TextArea(String str, int numLines, int numChars) throws HeadlessException TextArea(String str, int numLines, int numChars, int sBars) throws HeadlessException
FIGURE 24-7
Sample output from the TextFieldDemo applet
Part II:
The Java Library
Here, numLines specifies the height, in lines, of the text area, and numChars specifies its width, in characters Initial text can be specified by str In the fifth form, you can specify the scroll bars that you want the control to have sBars must be one of these values:
SCROLLBARS_BOTH SCROLLBARS_HORIZONTAL_ONLY SCROLLBARS_NONE SCROLLBARS_VERTICAL_ONLY
TextArea is a subclass of TextComponent Therefore, it supports the getText( ), setText( ), getSelectedText( ), select( ), isEditable( ), and setEditable( ) methods described in the preceding section TextArea adds the following methods: void append(String str) void insert(String str, int index) void replaceRange(String str, int startIndex, int endIndex) The append( ) method appends the string specified by str to the end of the current text insert( ) inserts the string passed in str at the specified index To replace text, call replaceRange( ) It replaces the characters from startIndex to endIndex 1, with the replacement text passed in str Text areas are almost self-contained controls Your program incurs virtually no management overhead Text areas only generate got-focus and lost-focus events Normally, your program simply obtains the current text when it is needed The following program creates a TextArea control:
// Demonstrate TextArea import javaawt*; import javaapplet*; /* <applet code="TextAreaDemo" width=300 height=250> </applet> */ public class TextAreaDemo extends Applet { public void init() { String val = "Java SE 6 is the latest version of the most\n" + "widely-used computer language for Internet programming\n" + "Building on a rich heritage, Java has advanced both\n" + "the art and science of computer language design\n\n" + "One of the reasons for Java's ongoing success is its\n" + "constant, steady rate of evolution Java has never stood\n" + "still Instead, Java has consistently adapted to the\n" + "rapidly changing landscape of the networked world\n" + "Moreover, Java has often led the way, charting the\n" + "course for others to follow"; TextArea text = new TextArea(val, 10, 30); add(text); } }
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