In this Java AWT Tutorial, we will learn KeyEvent and KeyListener. Here, we have a Panel the acts as Originator of the Keyboard Events and acts as listener also. This panel implements Java AWT KeyListener and handles KeyTyped, KeyReleased and KeyPressed actions.
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package AwtDemoPkg; import java.awt.Dimension; import java.awt.Label; import java.awt.Panel; import java.awt.event.InputEvent; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; //Sample 01: Implement MouseListeners //Sample 06: Implement MouseMotionListener //Sample 08: Implement KeyListener public class MouseTestPanel extends Panel implements MouseMotionListener, MouseListener, KeyListener { //Sample 02: Ctor Label Status; boolean CtrlOn = false; boolean AltOn = false; boolean ShiftOn = false; public MouseTestPanel(Label status) { super(); this.Status = status; setPreferredSize(new Dimension(300,200)); } //Sample 07: Motion Handler @Override public void mouseDragged(MouseEvent e) { Status.setText( "Mouse Draggged. (" + e.getX() + "," + e.getY() + ")"); } @Override public void mouseMoved(MouseEvent e) { Status.setText( "Mouse Moved. (" + e.getX() + "," + e.getY() + ")"); } @Override public void mouseClicked(MouseEvent e) { //Sample 04: Check which Mouse Button Clicked //Sample 14: Use the MouseEvent to Know the Button Click String out = ""; if(e.getButton() == MouseEvent.BUTTON1) out += "Left Mouse Clicked "; if(e.getButton() == MouseEvent.BUTTON2) out += "Middle Mouse Clicked "; if(e.getButton() == MouseEvent.BUTTON3) out += "Right Mouse Clicked "; //Sample 05: Get the Location out += "@ " + e.getX() + "," + e.getY(); //Sample 13: Update the Key Status String KeyState = "with "; if (CtrlOn) KeyState += " Ctrl"; if (AltOn) KeyState += " Alt"; if (ShiftOn) KeyState += " Shift"; if (CtrlOn || AltOn || ShiftOn ) out += KeyState + " Key Pressed"; Status.setText(out); } @Override public void mousePressed(MouseEvent e) { Status.setText("Mouse Pressed"); } @Override public void mouseReleased(MouseEvent e) { Status.setText("Mouse Released"); } @Override public void mouseEntered(MouseEvent e) { Status.setText("Mouse Entered"); } @Override public void mouseExited(MouseEvent e) { Status.setText("Mouse Exits"); } @Override public void keyTyped(KeyEvent e) { //Sample 10: Updated Typed Char String out = Status.getText(); out += " " + e.getKeyChar(); Status.setText(out); } @Override public void keyPressed(KeyEvent e) { //Sample 11: Set the Control Key Status int KeyCode = e.getKeyCode(); if (KeyCode == KeyEvent.VK_CONTROL) CtrlOn = true; if (KeyCode == KeyEvent.VK_ALT) AltOn = true; if (KeyCode == KeyEvent.VK_SHIFT) ShiftOn = true; } @Override public void keyReleased(KeyEvent e) { //Sample 12: Set the Control Key Status int KeyCode = e.getKeyCode(); if (KeyCode == KeyEvent.VK_CONTROL) CtrlOn = false; if (KeyCode == KeyEvent.VK_ALT) AltOn = false; if (KeyCode == KeyEvent.VK_SHIFT) ShiftOn = false; } } |
Categories: AWT-Tube
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