ui_scroll.java

手机文本浏览器

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.cnxinshe.noteview;

import javax.microedition.lcdui.Graphics;

/**
 *
 * @author 尹佳
 * QQ:387687685
 * email:[e-mail]
 */
public class UI_Scroll {
    //滚动条属性
    private int startX;
    private int startY;
    private int width;
    private int height;
    //滚动块属性
    private int rectStartX;
    private int rectStartY;
    private int rectWidth = 14;
    private int rectHeight = 100;

    public UI_Scroll(int startX, int startY, int width, int height) {
        this.startX = startX;
        this.startY = startY;
        this.width = width;
        this.height = height;

        this.rectStartX = startX + 3;
        this.rectStartY = startY + 20;
        this.rectWidth = width - 4;
        setRect(90, 90, 90);
    }

    /**
     * 算法思想
     * 
     * @param alreView
     * @param canView
     * @param allView
     */
    public void setRect(int alreView, int canView, int allView) {  
        if (allView <= canView) {
            // allView = canView;
            rectHeight = height - 40;
            rectStartY = startY + 20;
            return;
        }
        rectHeight = canView * 100 / allView * (height - 40) / 100;
        rectStartY = startY + 20 + (((alreView - canView) * 100 / (allView - canView)) * (height - 40 - rectHeight)) / 100;
    }

    public void paint(Graphics g) {
        //画背景框
        g.setColor(0);
        g.fillRect(startX, startY, width, height);
        g.setColor(0xFFFFFF);
        g.fillTriangle(startX + 4, startY + 15, startX + width - 4, startY + 15, startX + width / 2, startY + 5);
        g.fillTriangle(startX + 4, startY + height - 15, startX + width - 4, startY + height - 15, startX + width / 2, startY + height - 5);

        paintRect(g);
    }
    //画滚动块
    private void paintRect(Graphics g) {
        //画包围滚动块的矩形(144,144,144)
        g.setColor(144, 144, 144);
        g.drawLine(rectStartX + 1, rectStartY, rectStartX + rectWidth - 1, rectStartY);
        g.drawLine(rectStartX, rectStartY + 1, rectStartX, rectStartY + rectHeight - 1);
        g.drawLine(rectStartX + rectWidth, rectStartY + 1, rectStartX + rectWidth, rectStartY + rectHeight - 1);
        g.drawLine(rectStartX + 1, rectStartY + rectHeight, rectStartX + rectWidth - 1, rectStartY + rectHeight);
        //画滚动块
        g.setColor(136, 136, 136);
        g.drawLine(rectStartX + 2, rectStartY + 2, rectStartX + 2, rectStartY + rectHeight - 2);
        g.setColor(144, 144, 144);
        g.drawLine(rectStartX + 3, rectStartY + 2, rectStartX + 3, rectStartY + rectHeight - 2);
        g.setColor(140, 140, 140);
        g.drawLine(rectStartX + 4, rectStartY + 2, rectStartX + 4, rectStartY + rectHeight - 2);
        g.setColor(112, 112, 112);
        g.drawLine(rectStartX + 5, rectStartY + 2, rectStartX + 5, rectStartY + rectHeight - 2);
        g.setColor(80, 80, 80);
        g.drawLine(rectStartX + 6, rectStartY + 2, rectStartX + 6, rectStartY + rectHeight - 2);
        g.setColor(52, 52, 52);
        g.drawLine(rectStartX + 7, rectStartY + 2, rectStartX + 7, rectStartY + rectHeight - 2);
        g.setColor(32, 32, 32);
        g.drawLine(rectStartX + 8, rectStartY + 2, rectStartX + 8, rectStartY + rectHeight - 2);
        g.setColor(24, 24, 24);
        g.drawLine(rectStartX + 9, rectStartY + 2, rectStartX + 9, rectStartY + rectHeight - 2);
        g.setColor(24, 24, 24);
        g.drawLine(rectStartX + 10, rectStartY + 2, rectStartX + 10, rectStartY + rectHeight - 2);
        g.setColor(24, 24, 24);
        g.drawLine(rectStartX + 11, rectStartY + 2, rectStartX + 12, rectStartY + rectHeight - 2);
    }
}