组合模式设计窗口组件

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发布于: 2020 年 06 月 22 日
组合模式设计窗口组件﻿
概述但凡遇到树形的设计，第一时间想到用组合模式。比如一个窗口，可以包含自窗口，子窗口又包含若干控件。窗口绘制得时候，递归调用子窗口的绘制方法.
﻿
  设计﻿
首先定义窗口接口：
﻿
package com.geektime.composite;
public interface Window {
    public void draw();
}
﻿
定义一个控件的抽象基类，实现打印的默认操作：
﻿
package com.geektime.composite;
public abstract class Control implements Window {
    private String name = "";
    public Control(String name) {
        this.name = name;
    }
    protected void drawSelf() {
        String info = "print " +
                this.getClass().getSimpleName() +
                "(" + this.name +
                ")";
        System.out.println(info);
    }
    @Override
    public void draw() {
        this.drawSelf();
    }
}
﻿
有些子窗口还可以包含子窗口，即树的非叶子节点。定义一个BaseFrame抽象类继承Control:
﻿
package com.geektime.composite;
import java.util.ArrayList;
public abstract class BaseFrame extends Control {
    ArrayList<Window> subviewList = new ArrayList<Window>();
    public BaseFrame(String name) {
        super(name);
    }
    public void addSubview(Window subview) {
        this.subviewList.add(subview);
    }
    @Override
    public void draw() {
        this.drawSelf();
        //
        for (Window window : this.subviewList) {
            window.draw();
        }
    }
}
﻿
现在定义具体的实现类，比如Button，Label，TextBox等
﻿
Button
﻿
package com.geektime.composite;
public final class Button extends Control {
    public Button(String name) {
        super(name);
    }
}
﻿
CheckBox
﻿
package com.geektime.composite;
public final class CheckBox extends Control{
    public CheckBox(String name) {
        super(name);
    }
}
﻿
Frame
﻿
package com.geektime.composite;
public final class Frame extends BaseFrame{
    public Frame(String name) {
        super(name);
    }
}
﻿
Label
﻿
package com.geektime.composite;
public final class Label extends Control {
    public Label(String name) {
        super(name);
    }
}
﻿
LinkLabel
﻿
package com.geektime.composite;
public final class LinkLabel extends Control {
    public LinkLabel(String name) {
        super(name);
    }
}
﻿
PasswordBox
﻿
package com.geektime.composite;
public final class PasswordBox extends Control {
    public PasswordBox(String name) {
        super(name);
    }
}
﻿
Picture
﻿
package com.geektime.composite;
public final class Picture extends Control {
    public Picture(String name) {
        super(name);
    }
}
﻿
TextBox
﻿
package com.geektime.composite;
/**
 * @author pinkong
 */
public final class TextBox extends Control {
    public TextBox(String name) {
        super(name);
    }
}
﻿
组装测试﻿
package com.geektime.composite;
public class Client {
    public static void main (String [] args) {
        WinForm winForm = new WinForm("WINDOW窗口");
        Picture picture = new Picture("LOGO图片");
        Button btnLogin = new Button("登录");
        Button btnRegister = new Button("注册");
        Frame frame = new Frame("FRAME1");
        Label lbUsername = new Label("用户名");
        TextBox textBox = new TextBox("文本框");
        Label lbPassword = new Label("密码");
        TextBox tbPassword = new TextBox("密码框");
        CheckBox checkBox = new CheckBox("复选框");
        TextBox tbRemenber = new TextBox("记住用户名");
        LinkLabel linkLabel = new LinkLabel("忘记密码");
        //组装
        winForm.addSubview(picture);
        winForm.addSubview(btnLogin);
        winForm.addSubview(btnRegister);
        winForm.addSubview(frame);
        frame.addSubview(lbUsername);
        frame.addSubview(textBox);
        frame.addSubview(lbPassword);
        frame.addSubview(tbPassword);
        frame.addSubview(checkBox);
        frame.addSubview(tbRemenber);
        frame.addSubview(linkLabel);
        //打印
        winForm.draw();
    }
}
﻿
输出结果
﻿
print WinForm(WINDOW窗口)
print Picture(LOGO图片)
print Button(登录)
print Button(注册)
print Frame(FRAME1)
print Label(用户名)
print TextBox(文本框)
print Label(密码)
print TextBox(密码框)
print CheckBox(复选框)
print TextBox(记住用户名)
print LinkLabel(忘记密码)
﻿
发布于: 2020 年 06 月 22 日阅读数: 35
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