java - 如何停用特定菜单项的方法？

Question

我想以某种方式检查选择了哪个 MenuItem，以便某些菜单按钮以不同的方式绘制网格。

我在包 View 中的 MainUI 类中创建了菜单:

此外，我忘记提及创建菜单的代码位于名为 showContainers 的方法中

        // Create the game menu
    menuGame = new JMenu( "Game" );
    menuGame.setMnemonic( 'G' );
    menuBar.add( menuGame );
    // Create the game menu
    // Build a game menu items
            //...Create 3x3 Game
    menuGame3 = CreateMenuItem( menuGame, ITEM_RADIO,
                            "Create 3x3 Game", null, '3', null );
    //...Create 4x4 Game
    menuGame4 = CreateMenuItem( menuGame, ITEM_RADIO,
                            "Create 4x4 Game", null, '4', null );
            //...Create 5x5 Game
    menuGame5 = CreateMenuItem( menuGame, ITEM_RADIO,
                            "Create 5x5 Game", null, '5', null );
    //...Create 6x6 Game
    menuGame6 = CreateMenuItem( menuGame, ITEM_RADIO,
                            "Create 6x6 Game", null, '6', null );
            //...Create 7x7 Game
    menuGame7 = CreateMenuItem( menuGame, ITEM_RADIO,
                            "Create 7x7 Game", null, '7', null );
            //...Create 8x8 Game
    menuGame8 = CreateMenuItem( menuGame, ITEM_RADIO,
                            "Create 8x8 Game", null, '8', null );
            //...Create 9x9 Game
    menuGame9 = CreateMenuItem( menuGame, ITEM_RADIO,
                            "Create 9x9 Game", null, '9', null );
            ButtonGroup group = new ButtonGroup();
            group.add(menuGame3);
            group.add(menuGame4);
            group.add(menuGame5);
            group.add(menuGame6);
            group.add(menuGame7);
            group.add(menuGame8);
            group.add(menuGame9);

        public void addCreateGame3Listener(ActionListener createGameListener){
    menuGame3.addActionListener(createGameListener);
}

public void addCreateGame4Listener(ActionListener createGameListener){
    menuGame4.addActionListener(createGameListener);
}

    public void addCreateGame5Listener(ActionListener createGameListener){
    menuGame5.addActionListener(createGameListener);
}

public void addCreateGame6Listener(ActionListener createGameListener){
    menuGame6.addActionListener(createGameListener);
}

    public void addCreateGame7Listener(ActionListener createGameListener){
    menuGame7.addActionListener(createGameListener);
}

    public void addCreateGame8Listener(ActionListener createGameListener){
    menuGame8.addActionListener(createGameListener);
}

    public void addCreateGame9Listener(ActionListener createGameListener){
    menuGame9.addActionListener(createGameListener);
}

这是 GameUI 中的 painComponent，我在其中进行了修改:

@Override
public void paintComponent(Graphics g){

    highLightCage =false ;
    super.paintComponent(g); //clear the off-screen bitmap
    drawCells(g);
    drawCages(g);
            if( MainUI.menuGame3.isSelected()){
                    drawCageLabels(g);
            }
    drawLabels(g);
    drawGameHint(g);
}

问题是我没有在 MainUI 类中将 menuGame3 声明为公共(public)静态，因此我无法引用他。

Answer 1

查看 actionListeners 并看到这个 tutorial