Returns whether the component that currently has the focus listens for a specified key code, i.e. - Java Swing

Java examples for Swing:Event

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Description

Returns whether the component that currently has the focus listens for a specified key code, i.e.

Demo Code


import java.awt.*;
import javax.swing.*;

public class Main{
    /**//  www  . ja v  a  2s .  c om
     * Returns whether the component that currently has the focus listens for a
     * specified key code, i.e. it has an action associated with the key code.
     * @param keyCode The key code to test.
     * @return True if the component with the focus listens for the key code,
     * false otherwise.
     */
    static public boolean currentFocusOwnerListensForKey(int keyCode) {
        Component focusOwner = KeyboardFocusManager
                .getCurrentKeyboardFocusManager().getFocusOwner();
        if (focusOwner == null)
            return false;

        if (focusOwner instanceof JComponent == false)
            return false;

        return FocusUtils.componentListensForKey((JComponent) focusOwner,
                keyCode);
    }
    /**
     * Returns whether a component listens for a key code, i.e. it has an 
     * action associated with the key code.
     * @param component The component to examine.
     * @param keyCode The key code to test.
     * @return True if the component listens for the key code, false otherwise.
     */
    static public boolean componentListensForKey(JComponent component,
            int keyCode) {
        KeyStroke[] keyStrokes = component.getInputMap().allKeys();
        if (keyStrokes == null)
            return false;
        for (int i = keyStrokes.length - 1; i >= 0; i--) {
            if (keyCode == keyStrokes[i].getKeyCode()) {
                return true;
            }
        }
        return false;
    }
}

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