Keypress wiederhol-Problem

[Nicco]

Hallo zusammen,

ich möchte gerne ein Keyeventhandling programmieren, das einen Keypressed-event solange on hält, bis die Taste wieder losgelassen wird, ohne dass sie wiederholt wird. Habe eine Stunde gegoogelt, doch nichts treffendes gefunden (vielleicht habe ich mich auch zu blöd angestellt... sorry) und hoffe jetzt, dass mir vielleicht hier jemand einen Input geben kann.
Was mir durch den Kopf geistet, ist, dass ich wahrscheindlich einen eigenen Thread daneben laufend haben muss, der in einem Intervall dann den Status eines Keys mit den Vorgängigen vergleicht und erst umschaltet, wenn die letzten x Stati dieselben (up or down) gewesen sind. Hoffe aber, dass es auch einfacher geht...

Danke im Voraus.

Gruss Nik

 

[Beni]

Ich verstehe nicht ganz was du machen willst. Wieso kannst du nicht die Methode "keyReleased( KeyEvent e )", die der KeyListener besitzt, verwenden?

 

[Nicco]

Danke für die Antwort. Das mit den Events rausbekommen ist nicht das Problem - ich mach das wie folgt:

	public void keyPressed(KeyEvent e) {
		if (e.getKeyCode() == KeyEvent.VK_LEFT) {
			pilot.keyLeftPressed();
		} else if (e.getKeyCode() == KeyEvent.VK_UP) {
			pilot.keyForwardPressed();
		} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
			pilot.keyRightPressed();
		} else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
			pilot.keyBackwardPressed();
		}
	}


	public void keyReleased(KeyEvent e) {
		if (e.getKeyCode() == KeyEvent.VK_LEFT) {
			pilot.keyLeftReleased();
		} else if (e.getKeyCode() == KeyEvent.VK_UP) {
			pilot.keyForwardReleased();
		} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
			pilot.keyRightReleased();
		} else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
			pilot.keyBackwardReleased();
		}
	}

Aber jetzt habe ich das Problem, dass ein Key nach einer bestimmten Zeit wieder gedrückt wird (vom Betriebssystem aus) und damit die Keyevents wieder ausführt was aber nicht dem Zustand eines Keys entspricht. Am Besten siehst du es daran, wenn du in einem Textfeld einen Buchstaben gedückt hältst. Die Folge daraus ist, dass der Roboter dann ins stottern gerät, anstatt normal weiterzufahren.

Gruss Nicco


edit: @beni: http://dock.javaforge.com/ gratuliere - sieht genial aus!

 

[Nicco]

gemäss Chat hier meine 4 Klassen:

Motor:

package nxtPilot;

public class Motor {
	private final static long t = 300;

	public void forward() {
		System.out.println(Thread.currentThread().getName() + " forward");
		try {
			Thread.sleep(t);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public void stop() {
		System.out.println(Thread.currentThread().getName() + " stop");
		try {
			Thread.sleep(t);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public void backward() {
		System.out.println(Thread.currentThread().getName() + " backward");
		try {
			Thread.sleep(t);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

MotorManager:

package nxtPilot;

public final class MotorManager {
	private final static int BACKWARD = -1;
	private final static int FORWARD = 1;
	private final static int STOP = 0;
	private final static long updateTime = 40;
	private int lastMotorStatus = 0;
	private final Motor motor;
	private int motorStatus = 0;
	private final Thread motorUpdater = new Thread() {
		@Override
		public void run() {
			while (true) {
				setMotor();
				try {
					sleep(updateTime);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}

		private void setMotor() {
			if (lastMotorStatus != motorStatus) {
				lastMotorStatus = motorStatus;
				if (motorStatus == FORWARD) {
					motor.forward();
				} else if (motorStatus == BACKWARD) {
					motor.backward();
				} else {
					motor.stop();
				}
			}
		}
	};

	public MotorManager(Motor mot) {
		this.motor = mot;
		this.motorUpdater.start();
	}

	public void backward() {
		this.motorStatus = BACKWARD;
	}

	public void forward() {
		this.motorStatus = FORWARD;
	}

	public void stop() {
		this.motorStatus = STOP;
	}

}

Pilot:

package nxtPilot;

public final class Pilot {
	private final static long updateTime = 30;
	private boolean keyBackward = false;
	private boolean keyForward = false;
	private boolean keyLeft = false;
	private boolean keyRight = false;
	private MotorManager leftMM;
	private final Thread pilotUpdater = new Thread() {
		public void run() {
			while (true) {
				setPilot();
				try {
					Thread.sleep(updateTime);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}

		private void setPilot() {
			if ((keyForward && !keyBackward && !keyLeft && !keyRight)
					|| (keyForward && !keyBackward && keyLeft && keyRight)) {
				// fwd
				leftMM.forward();
				rightMM.forward();
			} else if (keyForward && !keyBackward && keyLeft && !keyRight) {
				// left fwd
				leftMM.stop();
				rightMM.forward();
			} else if ((!keyForward && !keyBackward && keyLeft && !keyRight)
					|| (keyForward && keyBackward && keyLeft && !keyRight)) {
				// left
				leftMM.backward();
				rightMM.forward();
			} else if (!keyForward && keyBackward && keyLeft && !keyRight) {
				// left bwd
				leftMM.stop();
				rightMM.backward();
			} else if ((!keyForward && keyBackward && !keyLeft && !keyRight)
					|| (!keyForward && keyBackward && keyLeft && keyRight)) {
				// bwd
				leftMM.backward();
				rightMM.backward();
			} else if (!keyForward && keyBackward && !keyLeft && keyRight) {
				// right bwd
				leftMM.backward();
				rightMM.stop();
			} else if ((!keyForward && !keyBackward && !keyLeft && keyRight)
					|| (keyForward && keyBackward && !keyLeft && keyRight)) {
				// right
				leftMM.forward();
				rightMM.backward();
			} else if (keyForward && !keyBackward && !keyLeft && keyRight) {
				// right fwd
				leftMM.forward();
				rightMM.stop();
			} else {
				// stop
				leftMM.stop();
				rightMM.stop();
			}
		}
	};

	private MotorManager rightMM;

	/**
	 * 
	 * @param updateTime
	 *            in millis
	 * @param left
	 * @param right
	 */
	public Pilot(Motor left, Motor right) {
		this.leftMM = new MotorManager(left);
		this.rightMM = new MotorManager(right);
		this.pilotUpdater.start();
	}

	public void keyBackwardPressed() {
		keyBackward = true;
	}

	public void keyBackwardReleased() {
		keyBackward = false;
	}

	public void keyForwardPressed() {
		keyForward = true;
	}

	public void keyForwardReleased() {
		keyForward = false;
	}

	public void keyLeftPressed() {
		keyLeft = true;
	}

	public void keyLeftReleased() {
		keyLeft = false;
	}

	public void keyRightPressed() {
		keyRight = true;
	}

	public void keyRightReleased() {
		keyRight = false;
	}
}

und zu guter Letzt noch PilotTester

package nxtPilot;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class PilotTester extends JFrame implements KeyListener, ActionListener {

	static final String newline = System.getProperty("line.separator");

	private static Pilot pilot;

	private static void createAndShowGUI() {
		// Create and set up the window.
		PilotTester frame = new PilotTester("PilotTester");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		// Set up the content pane.
		frame.addComponentsToPane();

		// Display the window.
		frame.pack();
		frame.setVisible(true);
	}

	public static void main(String[] args) {
		pilot = new Pilot(new Motor(), new Motor());

		/* Use an appropriate Look and Feel */
		try {
			// UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
			// UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");
			UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
		} catch (UnsupportedLookAndFeelException ex) {
			ex.printStackTrace();
		} catch (IllegalAccessException ex) {
			ex.printStackTrace();
		} catch (InstantiationException ex) {
			ex.printStackTrace();
		} catch (ClassNotFoundException ex) {
			ex.printStackTrace();
		}
		/* Turn off metal's use of bold fonts */
		UIManager.put("swing.boldMetal", Boolean.FALSE);

		// Schedule a job for event dispatch thread:
		// creating and showing this application's GUI.
		javax.swing.SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				createAndShowGUI();
			}
		});
	}

	JTextArea displayArea;

	JTextField typingArea;

	public PilotTester(String name) {
		super(name);
	}

	/** Handle the button click. */
	public void actionPerformed(ActionEvent e) {
		// Clear the text components.
		displayArea.setText("");
		typingArea.setText("");

		// Return the focus to the typing area.
		typingArea.requestFocusInWindow();
	}

	private void addComponentsToPane() {

		JButton button = new JButton("Clear");
		button.addActionListener(this);

		typingArea = new JTextField(20);
		typingArea.addKeyListener(this);

		// Uncomment this if you wish to turn off focus
		// traversal. The focus subsystem consumes
		// focus traversal keys, such as Tab and Shift Tab.
		// If you uncomment the following line of code, this
		// disables focus traversal and the Tab events will
		// become available to the key event listener.
		// typingArea.setFocusTraversalKeysEnabled(false);

		displayArea = new JTextArea();
		displayArea.setEditable(false);
		JScrollPane scrollPane = new JScrollPane(displayArea);
		scrollPane.setPreferredSize(new Dimension(375, 125));

		getContentPane().add(typingArea, BorderLayout.PAGE_START);
		getContentPane().add(scrollPane, BorderLayout.CENTER);
		getContentPane().add(button, BorderLayout.PAGE_END);
	}

	/*
	 * We have to jump through some hoops to avoid trying to print non-printing
	 * characters such as Shift. (Not only do they not print, but if you put
	 * them in a String, the characters afterward won't show up in the text
	 * area.)
	 */
	private void displayInfo(KeyEvent e, String keyStatus) {

		// You should only rely on the key char if the event
		// is a key typed event.
		int id = e.getID();
		String keyString;
		if (id == KeyEvent.KEY_TYPED) {
			char c = e.getKeyChar();
			keyString = "key character = '" + c + "'";
		} else {
			int keyCode = e.getKeyCode();
			keyString = "key code = " + keyCode + " ("
					+ KeyEvent.getKeyText(keyCode) + ")";
		}

		int modifiersEx = e.getModifiersEx();
		String modString = "extended modifiers = " + modifiersEx;
		String tmpString = KeyEvent.getModifiersExText(modifiersEx);
		if (tmpString.length() > 0) {
			modString += " (" + tmpString + ")";
		} else {
			modString += " (no extended modifiers)";
		}

		String actionString = "action key? ";
		if (e.isActionKey()) {
			actionString += "YES";
		} else {
			actionString += "NO";
		}

		String locationString = "key location: ";
		int location = e.getKeyLocation();
		if (location == KeyEvent.KEY_LOCATION_STANDARD) {
			locationString += "standard";
		} else if (location == KeyEvent.KEY_LOCATION_LEFT) {
			locationString += "left";
		} else if (location == KeyEvent.KEY_LOCATION_RIGHT) {
			locationString += "right";
		} else if (location == KeyEvent.KEY_LOCATION_NUMPAD) {
			locationString += "numpad";
		} else { // (location == KeyEvent.KEY_LOCATION_UNKNOWN)
			locationString += "unknown";
		}

		// displayArea.append(keyStatus + newline + " " + keyString + newline
		// + " " + modString + newline + " " + actionString
		// + newline + " " + locationString + newline);
		displayArea.append(keyStatus + " " + keyString
				+ Integer.toString((int) System.currentTimeMillis()) + newline);
		displayArea.setCaretPosition(displayArea.getDocument().getLength());
	}

	/** Handle the key pressed event from the text field. */
	public void keyPressed(KeyEvent e) {
		if (e.getKeyCode() == KeyEvent.VK_LEFT) {
			pilot.keyLeftPressed();
		} else if (e.getKeyCode() == KeyEvent.VK_UP) {
			pilot.keyForwardPressed();
		} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
			pilot.keyRightPressed();
		} else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
			pilot.keyBackwardPressed();
		}
		displayInfo(e, "KEY PRESS: ");
	}

	/** Handle the key released event from the text field. */
	public void keyReleased(KeyEvent e) {
		if (e.getKeyCode() == KeyEvent.VK_LEFT) {
			pilot.keyLeftReleased();
		} else if (e.getKeyCode() == KeyEvent.VK_UP) {
			pilot.keyForwardReleased();
		} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
			pilot.keyRightReleased();
		} else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
			pilot.keyBackwardReleased();
		}
		displayInfo(e, "KEY RELEA: ");
	}

	/** Handle the key typed event from the text field. */
	public void keyTyped(KeyEvent e) {
	}

}

Das Problem liegt darin, dass der Release-Event auch immer ausgeführt wird.... Müsste so etwas wie einen Filter bauen - aber was wär da am Besten?

vielen Dank im Voraus


Gruss Nicco

 

[Nicco]

Hat sich erledigt!

Gruss Nicco