Question

在一个简单的计算器应用程序中，我使用抽象动作来处理用鼠标点击的按钮以及按下相应的数字键盘键（带有键绑定）。我希望在使用键盘时能够进行某些化妆品更改，例如在按下数字1键时更改JButton编号1的边框。并在发布后将其更改回来。这一切都有效。然后我开始用鼠标再次按下JButtons并意识到密钥释放动作永远不会被调用，显然是因为我没有使用键绑定。所以我的问题是，有没有办法在鼠标释放/按钮升起时调用适当的释放抽象动作？

当我发现这个时，我最初尝试过这个：

Abstract action(){
set border to this..
code..
code..
code..
set border to this..
}

所以无论是键还是鼠标，它都会改变。然而它并没有改变，或者可能变得如此之快，以至于无法察觉。

在此实例中注册鼠标侦听器没有意义。无论如何我试过这个，我似乎无法将抽象动作注册为鼠标监听器。

感谢您的意见和建议。

我注册了actionlistener：

    btnMultiplication.addActionListener( operatorAction );
    btnDivision.addActionListener( operatorAction );
    btnAddition.addActionListener( operatorAction );
    btnSubtraction.addActionListener( operatorAction );
    btnSix.addActionListener( numberAction );
    btnSeven.addActionListener( numberAction );
    btnEight.addActionListener( numberAction );

* Action是抽象动作

我用它来进行键盘输入

im.put( KeyStroke.getKeyStroke( KeyEvent.VK_NUMPAD0, 0, false ), "Number" );
im.put( KeyStroke.getKeyStroke( KeyEvent.VK_NUMPAD0, 0, true ), "Number Released" );
am.put( "Number", numberAction );
am.put( "Number Released", numberActionR );

我使用数字操作来更改相应jbutton的边框。然后我使用已发布的号码再次更改边框。

显然，当我用鼠标点击时，边框突出显示。但已发布号码未调用。就像我说的那样，一起消除已发布的方面，并在抽象操作开始时进行第一次边界更改，然后在抽象操作结束时进行最后的边框更改很明显，你看不到边界的变化。

Answer 1

许多人在处理键绑定时遗漏的一件事是，您可以注册“按下”或“发布”事件（按默认设置）。所以在你的情况下，你需要做两件事。 “按下”事件应“按下”并“按下”按钮，“释放”应“按下”并“解除”按钮（顺序很重要），例如...

我也会改变你的注意力。让JButton Action执行此操作，而不是让键绑定触发所需的操作，这将允许您专注于让键绑定更改按钮的状态，最好是通过使用按钮模型，它将允许触发按钮以及相关的Action被调用。

Buttons

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import static javax.swing.Action.NAME;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

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

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            setLayout(new GridLayout(4, 3));
            add(createButton(7, KeyEvent.VK_7, KeyEvent.VK_NUMPAD7));
            add(createButton(8, KeyEvent.VK_8, KeyEvent.VK_NUMPAD8));
            add(createButton(9, KeyEvent.VK_9, KeyEvent.VK_NUMPAD9));
            add(createButton(4, KeyEvent.VK_4, KeyEvent.VK_NUMPAD4));
            add(createButton(5, KeyEvent.VK_5, KeyEvent.VK_NUMPAD5));
            add(createButton(6, KeyEvent.VK_6, KeyEvent.VK_NUMPAD6));
            add(createButton(1, KeyEvent.VK_1, KeyEvent.VK_NUMPAD1));
            add(createButton(2, KeyEvent.VK_2, KeyEvent.VK_NUMPAD2));
            add(createButton(3, KeyEvent.VK_3, KeyEvent.VK_NUMPAD3));
            add(createButton(0, KeyEvent.VK_0, KeyEvent.VK_NUMPAD0));
        }

        protected JButton createButton(int number, int... virtualKeys) {

            NumberAction na = new NumberAction(Integer.toString(number));
            JButton btn = new JButton(na);

            InputMap im = btn.getInputMap(WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
            ActionMap am = btn.getActionMap();

            for (int virtualKey : virtualKeys) {

                im.put(KeyStroke.getKeyStroke(virtualKey, 0, false), "number-pressed");
                im.put(KeyStroke.getKeyStroke(virtualKey, 0, true), "number-released");

            }

            am.put("number-pressed", new NumberKeyPressedAction(btn, true));
            am.put("number-released", new NumberKeyPressedAction(btn, false));

            return btn;

        }

        public class NumberAction extends AbstractAction {

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

            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println(getValue(NAME) + " was clicked");
            }

        }

        public class NumberKeyPressedAction extends AbstractAction {

            private final JButton btn;
            private final boolean pressed;

            public NumberKeyPressedAction(JButton btn, boolean pressed) {
                // You could just pass the button model, but this was easier...
                this.btn = btn;
                this.pressed = pressed;
            }

            @Override
            public void actionPerformed(ActionEvent e) {
                if (pressed) {
                    btn.getModel().setArmed(pressed);
                    btn.getModel().setPressed(pressed);
                } else {
                    btn.getModel().setPressed(pressed);
                    btn.getModel().setArmed(pressed);
                }
            }

        }

    }

}

Answer 2

所以，我想基于 MadProgrammer 给出的选择解决方案发布我的实现。

我删除了jbuttons的显式创建。我现在像这样创建它们：

createButton( 3, 5, 1, 1, ".", "btnDecimal", KeyEvent.VK_DECIMAL );
    createButton( 1, 5, 1, 2, "0", "btnZero", KeyEvent.VK_0, KeyEvent.VK_NUMPAD0 );
    createButton( 1, 4, 1, 1, "1", "btnOne", KeyEvent.VK_1, KeyEvent.VK_NUMPAD1 );
    createButton( 2, 4, 1, 1, "2", "btnTwo", KeyEvent.VK_2, KeyEvent.VK_NUMPAD2 );
    createButton( 3, 4, 1, 1, "3", "btnThree", KeyEvent.VK_3, KeyEvent.VK_NUMPAD3 );
    createButton( 1, 3, 1, 1, "4", "btnFour", KeyEvent.VK_4, KeyEvent.VK_NUMPAD4 );
    createButton( 2, 3, 1, 1, "5", "btnFive", KeyEvent.VK_5, KeyEvent.VK_NUMPAD5 );
    createButton( 3, 3, 1, 1, "6", "btnSix", KeyEvent.VK_6, KeyEvent.VK_NUMPAD6 );
    createButton( 1, 2, 1, 1, "7", "btnSeven", KeyEvent.VK_7, KeyEvent.VK_NUMPAD7 );
    createButton( 2, 2, 1, 1, "8", "btnEight", KeyEvent.VK_8, KeyEvent.VK_NUMPAD8 );
    createButton( 3, 2, 1, 1, "9", "btnNine", KeyEvent.VK_9, KeyEvent.VK_NUMPAD9 );

createButton 方法执行此操作：

private void createButton( int x, int y, int h, int w, String actionCommand, String name, int... keys ) {

    nAction na = new nAction( actionCommand );
    JButton btn = new JButton( na );
    btn.setName( name );
    InputMap im = btn.getInputMap( WHEN_IN_FOCUSED_WINDOW );
    ActionMap am = btn.getActionMap();

    for ( int virtualKey : keys ) {

        im.put( KeyStroke.getKeyStroke( virtualKey, 0, false ), "number-pressed" );
        im.put( KeyStroke.getKeyStroke( virtualKey, 0, true ), "number-released" );

    }

    am.put( "number-pressed", new NumberKeyPressedAction( btn, true ) );
    am.put( "number-released", new NumberKeyPressedAction( btn, false ) );

    GridBagConstraints gbc_btn = new GridBagConstraints();
    // gbc_btnEquals.anchor = GridBagConstraints.WEST;
    gbc_btn.fill = GridBagConstraints.BOTH;
    gbc_btn.insets = new Insets( 0, 0, 5, 5 );
    gbc_btn.gridheight = h;
    gbc_btn.gridwidth = w;
    gbc_btn.gridx = x;
    gbc_btn.gridy = y;
    frame.getContentPane().add( btn, gbc_btn );
    btn.setBackground( new Color( 225, 225, 225 ) );
    btn.setBorder( BorderFactory.createLineBorder( Color.BLACK ) );

正如您所看到的，我创建了我的实例，正如MadProgrammer在他的示例中所示，并创建了对AbstractActions的引用。然后我设置各种swing属性的属性，然后是边框和背景。这大大减少了代码和变量的使用。旁注。 createButton 中的参数名称及其用于命名按钮的用法不再使用，将被删除。

从按钮/鼠标释放调用Java AbstractAction

2 个答案: