package testCal;


import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

/**
 * 界面对象
 */
public class CalFrame extends JFrame {

	private JTextField textInput = null;// 显示计算结果
	private String[] resetOp = { "BS", "C", "Sqrt","+/-" };// 
	private String[] numCalOp = { "7", "8", "9", "/", "4", "5", "6", "*", "1",
			"2", "3", "-", ".", "0", "=", "+" };// 用数组保存
	private ButtonAction buttonAction = new ButtonAction();
	private ActionListener actionListener = null;//定义监听器
	public static final int FIELD_WGAPS = 0;
	public static final int FIELD_HGAPS = 0;
	public static final int PRE_WIDTH = 550;
	public static final int PRE_HEIGHT = 650;//定义面板基本数据
	public CalFrame() {
		init();
	}

	private void init() {
		this.setTitle("精仿iphone计算器");
		this.setResizable(true);//设置窗口体大小可变
		// 主面板
		JPanel mainPanel = new JPanel();//创建一个容器类的面板
		// 输入框面板
		mainPanel.setLayout(new BorderLayout(FIELD_HGAPS,FIELD_WGAPS));//设置文本框边界的尺寸
		mainPanel.add(getTextField(), BorderLayout.NORTH);//将计算结果放在整个面板的北部
		mainPanel.setPreferredSize(new Dimension(PRE_WIDTH,PRE_HEIGHT));//设置计算器大小
        
	
		JPanel centerPanel = new JPanel();
		centerPanel.setLayout(new BorderLayout(5, 1));//建立一个中部面板

        JButton[] resetButton = getRButton();//通过getRButton()这个方法来保存按钮对象的数组
		JPanel northPanel = new JPanel();
		northPanel.setPreferredSize(new Dimension(50,50));//设置面板大小
		northPanel.setLayout(new GridLayout(1, 3, 0, 0));//设置面板格式
		for (JButton b : resetButton)//遍历JButton型数组resetBotton 每一次访问数组的时候读取的数据放入JButton型的b中。
		{
			northPanel.add(b);//将数组的元素加到新建的面板中
		}//建立新面板以及增加 “BS”,"C","Sqrt","+/-"等按钮
		

		JButton[] numButton = getNButton();
		JPanel toCenterPanel = new JPanel();
		toCenterPanel.setPreferredSize(new Dimension(20,20));//设置面板大小
		toCenterPanel.setLayout(new GridLayout(4, 4, 0, 0));//设置面板格式
		for (JButton b : numButton) {
			toCenterPanel.add(b);
		}//建立新面板及增加数字键及运算符按钮

		centerPanel.add(northPanel, BorderLayout.NORTH);
		centerPanel.add(toCenterPanel, BorderLayout.CENTER);
		mainPanel.add(centerPanel, BorderLayout.CENTER);
		this.add(mainPanel);//将做好的各部分小面板整合到大面板中

	}


	public ActionListener getActionListener() {
		if (actionListener == null) 
		{
			actionListener = new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					String buttonText = e.getActionCommand();//区分不同的按钮，避免发生冲突
					String result = null;//假设运算结果为空

					try {
						result = buttonAction.buttonMethod(buttonText,
								textInput.getText());
					} catch (Exception e1) {
						System.out.println(e1.getMessage());
					}//捕获异常

					if (result != null) {
						textInput.setText(result);//把输出结果定为result
					}
				}
			};
		}
		return actionListener;//返回监听器的对象并执行相关的方法
	}//增加事件监听器


	private JTextField getTextField() {
		if (textInput == null) {
			textInput = new JTextField("0");//初始值定义为0
			textInput.setEditable(false);//输入框不可被编辑（仅允许复制粘贴）
			textInput.setBackground(new Color(0,0,0));//设置输出背景框颜色为黑色
			textInput.setForeground(new Color(255,255,255));//设置输出字体颜色为白色
			textInput.setHorizontalAlignment(JTextField.RIGHT);//向右边开始对齐
			textInput.setFont(new Font("宋体", Font.BOLD, 50));//设置字体样式为宋体，加粗，像素为50
		}
		return textInput;
	}//输入框的初始化


	private JButton[] getRButton() {
		JButton[] result = new JButton[resetOp.length];
		for (int i = 0; i < this.resetOp.length; i++) {
			JButton b = new JButton(resetOp[i]);//完成各个按钮的匹配
			if(i==3)
			{
				b.setBackground(new Color(250,128,10));//背景为橙色
				b.setForeground(new Color(255,255,255));//字体为白色
			}//判断是否为最右边那个按钮
			else
			{
			b.setBackground(new Color(233,233,216));
			}//其他按钮设置为银灰色
			b.setFont(new Font("宋体", Font.BOLD, 16));//设置字体格式
			b.addActionListener(getActionListener());//设置监听
			result[i] = b;
		}
		return result;
	}//获取按钮以及按钮属性的设置

	private JButton[] getNButton() {
		String[] calButton = { "/", "*", "-", "+", "=" };
		JButton[] result = new JButton[numCalOp.length];
		for (int i = 0; i < numCalOp.length; i++) {
			JButton b = new JButton(numCalOp[i]);
			if(i==3||i==7||i==11||i==15)
			{
				b.setBackground(new Color(250,128,10));//设置背景颜色
				b.setForeground(new Color(255,255,255));//设置字体颜色
			}//判断是不是最右边的按钮
			b.setFont(new Font("宋体", Font.BOLD, 16));//设置字体格式
			b.addActionListener(getActionListener());//注册监听器
			Arrays.sort(calButton);
			result[i] = b;//添加运算规则
		}
		return result;
	}

}