A simple applet that displays information about mouse events as they occur. Since double-buffering is not used, the display flickers quite a bit.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | /******************************************************* * MYCPLUS Sample Code - https://www.mycplus.com * * * * This code is made available as a service to our * * visitors and is provided strictly for the * * purpose of illustration. * * * * Please direct all inquiries to saqib at mycplus.com * *******************************************************/ import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SimpleTrackMouse extends JApplet implements MouseListener, MouseMotionListener { Display display; // Drawing surface, defined by nested class Display. int mouse_x, mouse_y; // Position of mouse. String modifierKeys = ""; // If non-null, gives special keys that are held down. String eventType = null; // If non-null, gives the type of the most recent mouse event. public class Display extends JPanel { // A nested class that defines the drawing surface of the // applet. This simply displays the information contained // in the main class instance variables mouse_x, mouse_y, // modifierKeys, and eventType. public void paintComponent(Graphics g) { // Draw the panel, showing information about mouse events. super.paintComponent(g); // Fills panel with background color. g.setColor(Color.blue); g.drawRect(0 ,0, getSize().width - 1 ,getSize().height - 1); g.drawRect(1 ,1, getSize().width - 3 ,getSize().height - 3); g.setColor(Color.red); if (eventType == null) { // If eventType is null, no mouse event has yet occurred // on the panel, so don't display any information. return; } g.drawString("Mouse event type: " + eventType, 6, 18); if (modifierKeys.length() > 0) g.drawString("Modifier keys: " + modifierKeys, 6, 34); g.setColor(Color.black); g.drawString("(" + mouse_x + "," + mouse_y + ")", mouse_x, mouse_y); } // end of paintComponent() } // end nested class Display public void init() { // Set background color and arrange for the applet to listen for mouse events. display = new Display(); setContentPane(display); display.setBackground(Color.white); display.addMouseListener(this); display.addMouseMotionListener(this); } void setInfo(MouseEvent evt) { // set up the information about event for display mouse_x = evt.getX(); mouse_y = evt.getY(); modifierKeys = ""; if (evt.isShiftDown()) modifierKeys += "Shift "; if (evt.isControlDown()) modifierKeys += "Control "; if (evt.isMetaDown()) modifierKeys += "Meta "; if (evt.isAltDown()) modifierKeys += "Alt"; display.repaint(); } // Implement all the events of the MouseListener and MouseMotionListener // interfaces. Each method sets eventType to record the type of event and // calls the setInfo method to extract other information from the event // for display. public void mousePressed(MouseEvent evt) { eventType = "mousePressed"; setInfo(evt); } public void mouseReleased(MouseEvent evt) { eventType = "mouseReleased"; setInfo(evt); } public void mouseClicked(MouseEvent evt) { eventType = "mouseClicked"; setInfo(evt); } public void mouseEntered(MouseEvent evt) { eventType = "mouseEntered"; setInfo(evt); } public void mouseExited(MouseEvent evt) { eventType = "mouseExited"; setInfo(evt); } public void mouseMoved(MouseEvent evt) { eventType = "mouseMoved"; setInfo(evt); } public void mouseDragged(MouseEvent evt) { eventType = "mouseDragged"; setInfo(evt); } } // end of class SimpleMouseTracker |
