I originally had an answer about Key Bindings, but after a little testing I found that they still had the same stutter problem. Don’t rely on the repeat rate of the OS. It can be different for every platform and a user may also customize it. Instead use a Timer to schedule the event. You … Read more
You should not use KeyListener for this type of interaction. Instead use key bindings, which you can read about in the Java Tutorial. Then you can use the InputEvent mask to represent when the various modifier keys are depresed. For example: // Component that you want listening to your key JComponent component = …; component.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, … Read more
It is possible. KeyboardFocusManager.getCurrentKeyboardFocusManager() .addKeyEventDispatcher(new KeyEventDispatcher() { @Override public boolean dispatchKeyEvent(KeyEvent e) { System.out.println(“Got key event!”); return false; } }); That will grab all key events. Returning false allows the keyboard focus manager to resume normal key event dispatching to the various components. If you want to catch key combos, you can keep a set … Read more
Generally speaking, where you have a limited set of key inputs, key bindings are a better choice. KeyListener suffers from issues related to focusability and with other controls in the GUI, focus will constantly be moving away from the component (with the KeyListener) all the time. A simple solution would be to use the Actions … Read more
keyPressed – when the key goes down keyReleased – when the key comes up keyTyped – when the unicode character represented by this key is sent by the keyboard to system input. I personally would use keyReleased for this. It will fire only when they lift their finger up. Note that keyTyped will only work … Read more
It’s possible but requires an implementation taking advantage of JNI which will not always be portable. Java System Hook is one such library that will work with Windows 32 & 64 bit.
Try this: UPDATE: Kotlin: editText.setSelection(editText.length())//placing cursor at the end of the text Java: editText.setSelection(editText.getText().length());
I’ll bet that you’re requesting focus before the JPanel has been rendered (before the top level window has either had pack() or setVisible(true) called), and if so, this won’t work. Focus request will only be possibly granted after components have been rendered. Have you checked what your call to requestFocus() has returned? It must return … Read more
Use a collection to remember which keys are currently pressed and check to see if more than one key is pressed every time a key is pressed. class MultiKeyPressListener implements KeyListener { // Set of currently pressed keys private final Set<Integer> pressedKeys = new HashSet<>(); @Override public synchronized void keyPressed(KeyEvent e) { pressed.add(e.getKeyCode()); Point offset … Read more
There is a library that does the hard work for you: https://github.com/kwhat/jnativehook