Keylistener for Ctrl+C from another program

Question

I want to automatically put the contents into a textArea when a text in notepad is copied via Ctrl+C. I'm wondering of how to listen to the Keys of notepad. Is it possible to listen to Keys of notepad or any other program?

Listen to the clipboard instead. http://stackoverflow.com/q/14226064/2855515 — brian, Nov 21 '16 at 15:09
Listening to `Ctrl+C` globally is possible. It's called a keylogger and it's definitely nothing you want to implement in your java-application. As @brian already pointed out, the better approach is to listen for the system-clipboard instead. — , Nov 21 '16 at 15:12

score 2 · Accepted Answer · answered Nov 21 '16 at 15:42

Here is a JavaFX version of the clipboard listeners referenced in other answers and comments:

import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.input.Clipboard;
import javafx.stage.Stage;

public class SystemClipboardWatcher extends Application {

    @Override
    public void start(Stage primaryStage) {
        TextArea clipboardView = new TextArea();

        AnimationTimer timer = new AnimationTimer() {

            Clipboard systemClipboard = Clipboard.getSystemClipboard();

            @Override
            public void handle(long timestamp) {
                String content = systemClipboard.getString();
                // do anything you need with this, e.g.:
                clipboardView.setText(content);
            }
        };

        timer.start();

        primaryStage.setScene(new Scene(clipboardView, 600, 600));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

score 0 · Answer 2 · edited May 23 '17 at 11:59

0

No, it is not possible to get all keyevents of all application in java.

So you have 2 possible solutions.

You only get the changes of the clipboard, with a clipboard-listener. SO example
Use of JNA, JNI, jintellitype, ... to listen to the system-keyevents SO example

edited May 23 '17 at 11:59

Community

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answered Nov 21 '16 at 15:17

keil

154
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score 0 · Answer 3 · answered Nov 21 '16 at 15:17

0

It is possible but a very bad coding practice. If you still want to do it: https://github.com/kwhat/jnativehook.
A way better idea would be to watch for changes in the clipboard.

answered Nov 21 '16 at 15:17

Grunzwanzling

443
4
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Keylistener for Ctrl+C from another program

3 Answers3