selector.java

anyview手机小说阅览器的开源代码

package com.ismyway.anyview;

import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.Graphics;

/**
 * <p>Title: AnyView</p>
 *
 * <p>Description: E680(I) Reader</p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: www.ismyway.com</p>
 *
 * @author ZhangJian
 * @version 1.0
 */
public class Selector extends AbstractWindow {
    public final static int ANCHOR = Graphics.LEFT | Graphics.TOP;
    final static int ButtonHeight = 20; //滚动条需要空间的高

    protected String title; //标题
    protected byte[][] byteItems; //选项的字节数组形式
    //protected Image[] itemImage; //图标，暂留
    protected Image windowImage; //保存当前图体的Image对象

    protected int itemIndex = 0;
    private int topIndex = 0; //当前总页数
    boolean showScrollBar = false; //是否需要滚动条
    private int earseScrollBarHeight; //可重绘部分的高（即滚动条占的高）
    private int cubeWidth = 0; //选择框的宽
    private boolean hasItems = true; //当前的选项集是否为空
    protected int itemPages = 0;
    protected Image cube;
    private boolean pageup = false, pagedown = false; //记录用户点击触摸屏时的动作

    final static int HorPad = 10;
    final static int LinePad = 5;

    protected int ShowItems = 10;
    protected int VecPad = 25;

    public Selector(String title, String[] items) {
        this(title, items, 0);
    }

    public Selector(String title, String[] items, int defaultIndex) {
        WINDOW_STATE = OPENING;

        this.title = title;
        if (null == items || items.length < 1) {
            this.byteItems = new byte[1][];
            byteItems[0] = AnyView.cf.str2bytes("(EMPTY!)");
            hasItems = false;
        } else {
            this.byteItems = new byte[items.length][];
            for (int i = 0; i < items.length; i++) {
                byteItems[i] = AnyView.cf.str2bytes(items[i]);
            }
        }

        itemIndex = defaultIndex;
        topIndex = 0;
        while (topIndex + ShowItems <= itemIndex) {
            topIndex += ShowItems;
        }
        if (defaultIndex < 0 || defaultIndex > byteItems.length - 1) {
            itemIndex = 0;
            topIndex = 0;
        }

        defineWindow();
        refreshList();
    }

    public Selector(String title, byte[][] items, int defaultIndex) {
        WINDOW_STATE = OPENING;

        this.title = title;
        if (null == items || items.length < 1) {
            this.byteItems = new byte[1][];
            byteItems[0] = AnyView.cf.str2bytes("(EMPTY!)");
            hasItems = false;
        } else {
            this.byteItems = items;
        }

        itemIndex = defaultIndex;
        topIndex = defaultIndex;
        if (defaultIndex < 0 || defaultIndex > items.length - 1) {
            itemIndex = 0;
            topIndex = 0;
        }

        defineWindow();
        refreshList();
    }

    void defineWindow() {
        //确定标题栏的高
        VecPad = AnyView.cf.FontHeight + 10;

        //确定当前窗口显示的条目
        if (AnyView.readType == 1) { //横屏
            if ((AnyView.cf.FontHeight + LinePad) * ShowItems + VecPad +
                LinePad > AnyView.ScreenWidth) { //需要翻页
                ShowItems = (AnyView.ScreenWidth - LinePad - VecPad -
                             ButtonHeight) / (AnyView.cf.FontHeight + LinePad);
            }
        } else {
            if ((AnyView.cf.FontHeight + LinePad) * ShowItems + VecPad +
                LinePad > AnyView.ScreenHeight) { //需要翻页
                ShowItems = (AnyView.ScreenHeight - LinePad - VecPad -
                             ButtonHeight) / (AnyView.cf.FontHeight + LinePad);
            }
        }

        //确定当前窗口的宽
        int max = AnyView.cf.str2bytes(title).length;
        for (int i = 0; i < byteItems.length; i++) {
            int c = byteItems[i].length;
            if (c >= max) {
                max = c;
            }
        }
        this.width = max * AnyView.cf.AsciiWidth + (HorPad << 1);

        //确定窗口的高
        if (byteItems.length <= ShowItems) { //当前可以显示完成
            this.height = byteItems.length * (AnyView.cf.FontHeight + LinePad) +
                          LinePad + VecPad;
            ShowItems = byteItems.length;
            showScrollBar = false;
        } else {
            this.height = ShowItems * (AnyView.cf.FontHeight + LinePad) +
                          LinePad + VecPad + ButtonHeight; //6是翻页按钮的高
            showScrollBar = true;
        }

        if (AnyView.readType == 1) { //横屏
            this.LEFT = (AnyView.ScreenWidth - this.height) >> 1;
            this.TOP = (AnyView.ScreenHeight + this.width) >> 1;
        } else {
            this.LEFT = (AnyView.ScreenWidth - this.width) >> 1;
            this.TOP = (AnyView.ScreenHeight - this.height) >> 1;
        }
        this.LEFT = this.LEFT < 0 ? 0 : this.LEFT;
        this.TOP = this.TOP < 0 ? 0 : this.TOP;

        //是否需要滚动条
        cubeWidth = width - 4;
        if (showScrollBar) {
            earseScrollBarHeight = height - VecPad - ButtonHeight; //确定需要擦除滚动条背景的高
            cubeWidth -= 4;
        } else {
            earseScrollBarHeight = height - VecPad - 2;
        }

        //创建选择时的背景条
        int[] c = new int[cubeWidth * (AnyView.cf.FontHeight + 2)];
        for (int i = 0; i < c.length; i++) {
            c[i] = 0x7FFFFFFF;
        }
        cube = Image.createRGBImage(c, cubeWidth,
                                    CustomFont.FontHeight + 2, true);
        c = null;
    }

    void refreshList() {
        windowImage = Image.createImage(width, height);
        Graphics g = windowImage.getGraphics();
        g.setColor(AnyView.background);
        g.fillRect(0, 0, width, height);
        g.setColor(AnyView.bordorcolor);
        g.drawRect(0, 0, width - 1, height - 1);
        g.drawLine(0, VecPad, width, VecPad);

        //绘制标题
        byte[] t = AnyView.cf.str2bytes(title);
        AnyView.cf.setColor(AnyView.titlecolor);
        Image img = AnyView.cf.buildImage(t);
        g.drawImage(img, 5, 5, ANCHOR);
        img = null;

        //绘制选项
        int top = VecPad + 5;
        AnyView.cf.setColor(AnyView.fontcolor);
        for (int i = 0; i < ShowItems; i++) {
            img = AnyView.cf.buildImage(byteItems[i + topIndex]);
            g.drawImage(img, HorPad, top, ANCHOR);
            top += AnyView.cf.FontHeight + LinePad;
        }

        //绘制滚动条背景
        g.setColor(AnyView.background);
        g.fillRect(width - HorPad, VecPad + 1, HorPad, earseScrollBarHeight);
        g.setColor(AnyView.bordorcolor);
        g.drawRect(0, 0, width - 1, height - 1);

        //绘制滚动条
        if (showScrollBar) {
            g.setColor(AnyView.bordorcolor);
            g.drawLine(0, height - ButtonHeight, width, height - ButtonHeight);
            g.drawLine(width >> 1, height - ButtonHeight, width >> 1, height);
            g.drawLine(width - 5, VecPad + 1, width - 5, height - ButtonHeight);

            int x = ((width >> 1) - 11) >> 1;
            int y = height - ButtonHeight + 7;
            g.drawImage(AnyView.UpArrow, x, y, ANCHOR);
            x += width >> 1;
            g.drawImage(AnyView.DownArrow, x, y, ANCHOR);

            int h = height - VecPad - ButtonHeight - 4;
            x = topIndex * h / byteItems.length;
            y = (topIndex + ShowItems) * h / byteItems.length;
            g.drawLine(width - 3, VecPad + 2 + x, width - 3, VecPad + 2 + y);
        }
    }


    /*public Selector(String title, String[] items, int width,
                    int height) {
        this.title = title;
        this.items = items;
        this.width = width;
        this.height = height;

        int[] c = new int[(width - 4) * (AnyView.cf.FontHeight + 2)];
        for (int i = 0; i < c.length; i++) {
            c[i] = 0x7FFFFFFF;
        }
     cube = Image.createRGBImage(c, (width - 4), CustomFont.FontHeight + 2, true);

        prepare();
         }*/

    /*protected void setItems(String[] items) {
        this.items = items;