Question

出于我的应用程序的目的，我需要创建几个相同的视图，这些视图应该表现并响应相同的事件。我应该实现我需要的每个相同的视图并在我的控制器中保存这个视图列表，还是有更好的方法来处理它？感谢。

Answer 1

根据我的理解......你应该按照你的想法。

列出您安装到控制器的视图。如果事件发生，请浏览视图列表并更新所有视图。

EDIT1：以下是一个非常简单的示例，展示了如何完成。

import java.awt.Color;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class ManyViewsTest
{   
    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {               
                View v1 = new View();
                View v2 = new View();
                View v3 = new View();
                View v4 = new View();               
                View v5 = new View();               
                JPanel contentPane = new JPanel();
                contentPane.add(v1);
                contentPane.add(v2);
                contentPane.add(v3);
                contentPane.add(v4);
                contentPane.add(v5);
                JFrame f = new JFrame();
                f.setContentPane(contentPane);
                f.setSize(800, 600);
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                Controller c = new Controller(f);
                f.setVisible(true);
            }
        });
    }
}

class Controller 
{
    private List<View> views;

    public Controller(JFrame f)
    {
        this.views = new ArrayList<View>();
        f.addMouseListener(mL);
        for(Component c: f.getContentPane().getComponents())
        {
            if(c instanceof View)
                views.add((View)c);
        }
    }

    public void updateView(String text)
    {
        for(View v: views)
            v.setLabelText(text);
    }

    private MouseListener mL = new MouseAdapter() 
    {
        int pressCounter = 0;
        @Override
        public void mousePressed(MouseEvent e)
        {
            super.mousePressed(e);
            updateView("mousePressed, pressCounter="+(++pressCounter));
        }                                       
    };
}

class View extends JPanel
{
    private static final long serialVersionUID = 1L;
    private JLabel label;
    public View()
    {
        this.label = new JLabel("Initialized");
        label.setBorder(BorderFactory.createLineBorder(Color.GREEN));
        add(label);
    }
    public void setLabelText(String text)
    {
        label.setText(text);
    }
}

MVC有几个相同的视图

1 个答案: