Question

我有时会在我的Java应用程序中显示对话框。

目前，Controller类是（期望在我的模型上只调用getter的一些例外），就像我的模型和UI之间的调解器一样。

但是我的UI知道我的控制器，我的控制器知道我的UI。

每当我添加一个新对话框时，我都会在控制器和视图类中添加一个方法。

使用设计模式是否有更优雅的方式使用新用户对话框扩展我的程序？

为了说明我现在的互动情况，我会添加一些代码段。

来自我的用户界面的代码

    itmEmailSettings.addActionListener( new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            controller.showEmailSettingsDialog();
        }
    } );

更多用户界面代码

    public void showEmailSettingsDialog(String host, int port, int authMode,
            String user, String pass, String fromEMail, String fromName) {
        EmailSettingsDialog d = new EmailSettingsDialog(
                host, port, authMode,
                user, pass, fromEMail, fromName
                );
        d.createJDialog( mainFrame.getFrame() ).setVisible(true);
        if(d.isValid()){
            controller.changeEmailSettings(  d.getHost(), d.getPort(), d.getAuthMode(), d.getFromEMail(), d.getFromName(), d.getUser(), d.getPass()  );
        }
    }

控制器代码：

public void showEmailSettingsDialog() {
    try{
        if(!pm.hasProjectFileAccess()){
            mainFrame.showNoProjectfileAccess();
            return;
        }
        ProgrammSettingsRepository pr = Utils.getProgrammSettingsRepository(pm);
        String host = pr.retreive(ProgrammSettingsRepository.KEY_EMAIL_HOST);
        int port = pr.retreive(ProgrammSettingsRepository.KEY_EMAIL_PORT)==null?0:Integer.parseInt( pr.retreive(ProgrammSettingsRepository.KEY_EMAIL_PORT) );
        int authMode = pr.retreive(ProgrammSettingsRepository.KEY_EMAIL_SSL_MODE)==null?0:Integer.parseInt( pr.retreive(ProgrammSettingsRepository.KEY_EMAIL_SSL_MODE) );
        String user = pr.retreive(ProgrammSettingsRepository.KEY_EMAIL_USER);
        String pass = pr.retreive(ProgrammSettingsRepository.KEY_EMAIL_PASSWORD);
        String fromEMail = pr.retreive(ProgrammSettingsRepository.KEY_EMAIL_FROM_EMAIL);
        String fromName = pr.retreive(ProgrammSettingsRepository.KEY_EMAIL_FROM_NAME);

        menuView.showEmailSettingsDialog(host, port, authMode, user, pass, fromEMail, fromName);
    }catch(SQLException e){
        throw new RuntimeException(e.getMessage(), e);
    }
}

public void changeEmailSettings(String host, int port, int authMode,
        String fromEMail, String fromName, String user, String pass) {
    try {
        ProgrammSettingsRepository pr = Utils.getProgrammSettingsRepository(pm);
        pr.store( ProgrammSettingsRepository.KEY_EMAIL_HOST , String.valueOf( host ));
        pr.store( ProgrammSettingsRepository.KEY_EMAIL_PORT , String.valueOf( port ));
        pr.store( ProgrammSettingsRepository.KEY_EMAIL_SSL_MODE , String.valueOf( authMode ));
        pr.store( ProgrammSettingsRepository.KEY_EMAIL_USER , String.valueOf( user ));
        pr.store( ProgrammSettingsRepository.KEY_EMAIL_PASSWORD, String.valueOf( pass ));
        pr.store( ProgrammSettingsRepository.KEY_EMAIL_FROM_EMAIL , String.valueOf( fromEMail ));
        pr.store( ProgrammSettingsRepository.KEY_EMAIL_FROM_NAME , String.valueOf( fromName ));
        pr.store(ProgrammSettingsRepository.KEY_EMAIL_SETTINGS_CONFIGURED, "true");
    } catch (SQLException e) {
        throw new RuntimeException(e.getMessage(), e);
    }
}

Answer 1

据我所知，从UI调用Controller，然后从Controller调用UI来显示对话框。控制器执行一些计算，然后调用UI以显示对话框。

如果您对UI类实现IReportable。

public interface IReportable {
    public void showYesNoDialog(//all needed params);
    public void showSimpleDialog(//all needed params);
            .
            .
            .
}

public class DialogController() {
    private IRportable _reportable;//delegator

    public DialogController(IRportable _reportable) {//bridge pattern.
        _reportable = reportable;
    }

    public void showEmailDialog() {
        //calculations
        _reportable.showSimpleDialog(//params);
    }

    public void showCustomerDialog() {
        //calculations
        _reportable.showYesNoDialog(//params);
    }

}

public class UIClass implements IReportable {
    private DialogController _dialogController;

    public UIClass() {
        _dialogController = new DialogController();
    }

    public void someMethod() {
        if() {

        }
        ...
        _dialogController.showEmailDialog();
    }

    public void someOtherMethod() {
        if() {

        }
        ...
        _dialogController.showCustomerDialog();
    }

    @Override
    public void showYesNoDialog(//all needed params) {
        //code here to show dialog according to params.
    }

    @Override
    public void showSimpleDialog(//all needed params) {
        //code here to show dialog according to params.
    }

}

这样你就可以依赖接口而不是单个ui组件。您可以将接口更改为抽象类，以使所有UI类具有相同的功能......

我可以使用哪种设计模式来显示对话框？

1 个答案: