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从按钮/鼠标释放中调用Java AbstractAction

[英]Calling a Java AbstractAction from a button/mouse release

在一个简单的计算器应用程序中,我使用抽象操作来处理用鼠标单击的按钮以及相应的数字键盘按键(带有键绑定)。 我希望在使用键盘时进行某些外观上的更改,例如在按数字1键时更改数字1的JButton的边框。 并在发布时将其更改回。 所有这一切。 然后,我又开始用鼠标再次按下JButton,并意识到从不调用键释放操作,这显然是因为我没有使用键绑定。 所以我的问题是,有一种方法可以在鼠标释放/按钮抬起时调用适当的释放抽象动作?

当我发现这个时,我最初尝试了这个:

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

因此,无论键还是鼠标,它都会改变。 但是,它没有改变,或者运行得如此之快以至于无法检测。

在这种情况下,注册鼠标侦听器没有任何意义。 无论如何,我还是尝试过,但似乎无法将抽象操作注册为鼠标侦听器。

感谢您的意见和建议。

我注册动作侦听器:

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

*动作是抽象动作

我用它来输入键盘

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Number动作来更改相应jbutton的边框。 然后,我使用数字下达来再次更改边框。

显然,当我用鼠标单击时,边框会突出显示。 但是释放号码不会调用。 就像我说过的,消除所有释放的方面,将第一个边界更改放在抽象动作的开始,然后将最后一个边界更改放在抽象动作的结尾,显然进行得如此之快,以至于看不到边界的变化。

很多人在处理键绑定时会错过的一件事是,您可以注册“ press”或“ release”事件(press是默认设置)。 因此,在您的情况下,您需要同时执行这两项操作。 “按下”事件应“布防”并“按下”按钮,“释放”应“松开”并“解除”按钮(顺序很重要),例如...

我也会改变你的重点。 不必让按键绑定触发所需的动作,而是让JButton Action这样做,这将使您专注于让按键绑定更改按钮的状态,最好通过使用按钮模型来实现,该模式将允许按钮被触发并调用相关的Action

纽扣

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);
                }
            }

        }

    }

}

因此,我想根据MadProgrammer提供的选定解决方案发布有效的实现

我删除了jbutton的显式创建。 我现在这样创建它们:

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 ) );

如您所见,我按照MadProgrammer在其示例中显示的方式创建了实例,并创建了对AbstractActions的引用。 然后,我设置各种挥杆属性的属性,然后设置边框和背景。 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。

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