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Handling Scroll Bars
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To process scroll bar events, you need to implement the AdjustmentListener interface Each time a user interacts with a scroll bar, an AdjustmentEvent object is generated Its getAdjustmentType( ) method can be used to determine the type of the adjustment The types of adjustment events are as follows: BLOCK_DECREMENT BLOCK_INCREMENT A page-down event has been generated A page-up event has been generated
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TRACK UNIT_DECREMENT UNIT_INCREMENT
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An absolute tracking event has been generated The line-down button in a scroll bar has been pressed The line-up button in a scroll bar has been pressed
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The following example creates both a vertical and a horizontal scroll bar The current settings of the scroll bars are displayed If you drag the mouse while inside the window, the coordinates of each drag event are used to update the scroll bars An asterisk is displayed at the current drag position // Demonstrate scroll bars import javaawt*; import javaawtevent*; import javaapplet*; /* <applet code="SBDemo" width=300 height=200> </applet> */ public class SBDemo extends Applet implements AdjustmentListener, MouseMotionListener { String msg = ""; Scrollbar vertSB, horzSB; public void init() { int width = IntegerparseInt(getParameter("width")); int height = IntegerparseInt(getParameter("height")); vertSB = new Scrollbar(ScrollbarVERTICAL, 0, 1, 0, height); horzSB = new Scrollbar(ScrollbarHORIZONTAL, 0, 1, 0, width); add(vertSB); add(horzSB); // register to receive adjustment events vertSBaddAdjustmentListener(this); horzSBaddAdjustmentListener(this); } addMouseMotionListener(this);
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public void adjustmentValueChanged(AdjustmentEvent ae) { repaint(); } // Update scroll bars to reflect mouse dragging public void mouseDragged(MouseEvent me) { int x = megetX(); int y = megetY(); vertSBsetValue(y); horzSBsetValue(x); repaint(); } // Necessary for MouseMotionListener public void mouseMoved(MouseEvent me) { } // Display current value of scroll bars
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public void paint(Graphics g) { msg = "Vertical: " + vertSBgetValue(); msg += ", Horizontal: " + horzSBgetValue(); gdrawString(msg, 6, 160); // show current mouse drag position gdrawString("*", horzSBgetValue(), vertSBgetValue());
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Sample output from the SBDemo applet is shown in Figure 22-6
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Figure 226: Sample output from the SBDemo applet
Using a TextField
The TextField class implements a single-line text-entry area, usually called an edit control Text fields allow the user to enter strings and to edit the text using the arrow keys, cut and paste keys, and mouse selections TextField is a subclass of TextComponent TextField defines the following constructors: TextField( ) TextField(int numChars) TextField(String str) TextField(String str, int numChars) The first version creates a default text field The second form creates a text field that is numChars characters wide The third form initializes the text field with the string contained in str The fourth form initializes a text field and sets its width TextField (and its superclass TextComponent) provides several methods that allow you to utilize a text field To obtain the string currently contained in the text field, call getText( ) To set the text, call setText( ) These methods are as follows: String getText( ) void setText(String str) Here, str is the new string The user can select a portion of the text in a text field Also, you can select a portion of text under program control by using select( ) Your program can obtain the currently selected text by calling getSelectedText( ) These methods are shown here: String getSelectedText( ) void select(int startIndex, int endIndex) getSelectedText( ) returns the selected text The select( ) method selects the characters beginning at startIndex and ending at endIndex 1
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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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