j2me电子书源码随便下拉

package org.midi.j2me.util; import java.util.Vector; import javax.microedition.lcdui.Font; import javax.microedition.lcdui.Graphics; /** * 字符串换行及翻页 * */ public class StringSplitor { /** 字符串绘制的宽高，起始x,y坐标 */ public int layoutWidth, layoutHeight, layoutX, layoutY; /** 每行的间隔 */ private int rowGap; /** 字符串文本 */ private String text; /** 字体高度 */ private int fontHeight; /** 文本的总行数 */ private int totalRowCount; /** 文本被分割后存在Vector中 */ private Vector row; /** 字体 */ private Font font = null; /** 当前行 */ private int currRow = 0; public boolean isChange = false; /** 一行的高度 */ private int rowHeight = 0; private int moveRowCount; /** 屏幕可以显示的行数 */ private int screenRowCount = 0; /** 前景色 */ private int fgColor = -1; /** * 构造函数 <br> * Str：布局中的字符串 <br> * X：布局的左上角位置 <br> * Y：布局的右上角位置 <br> * LayoutX：布局顶点X <br> * LayoutY：布局顶点Y <br> * LayoutWidth：布局宽度 <br> * LayoutHeight：布局高度 <br> * Gap：各行之间的空隙 */ public StringSplitor(String text, int layoutX, int layoutY, int layoutWidth, int layoutHeight, int rowGap, int fgColor) { this.text = text; this.layoutX = layoutX; this.layoutY = layoutY; this.layoutWidth = layoutWidth; this.layoutHeight = layoutHeight; this.rowGap = rowGap; this.fgColor = fgColor; } /** * 分割 * * @param font */ public void split(Font font) { this.font = font; fontHeight = font.getHeight(); row = Dialogue.divideString(this.text, layoutWidth, font); row = Dialogue.divideString(row, layoutWidth, font); totalRowCount = row.size(); if (layoutHeight % (fontHeight + rowGap) == 0) { screenRowCount = (layoutHeight / (fontHeight + rowGap)); } else { screenRowCount = (layoutHeight / (fontHeight + rowGap)) - 1; } moveRowCount = totalRowCount - screenRowCount; rowHeight = layoutHeight / (moveRowCount); } /** * 画出字符串 */ public void draw(Graphics g, int x, int y) { int i1 = g.getClipX(); int j1 = g.getClipY(); int k1 = g.getClipWidth(); int l1 = g.getClipHeight(); g.setClip(layoutX, layoutY, layoutWidth, layoutHeight); g.setFont(font); for (int i = currRow; i < row.size(); i++) { String s = (String) row.elementAt(i); g.setColor(this.fgColor); g.drawString(s, x, y + (i - currRow) * (fontHeight + rowGap), Graphics.TOP | Graphics.LEFT); } if (moveRowCount >= 1) { drawScrollBar(g); } g.setClip(i1, j1, k1, l1); isChange = false; } /** * 画滚动条 * * @param g */ private void drawScrollBar(Graphics g) { g.setColor(21, 111, 72); g.drawLine(layoutX + layoutWidth - 2, layoutY, layoutX + layoutWidth - 2, layoutY + layoutHeight); int curY = layoutY + (currRow * layoutHeight) / (moveRowCount); if (curY + rowHeight >= (layoutY + layoutHeight)) { curY = layoutY + layoutHeight - rowHeight; } g.fillRect(layoutX + layoutWidth - 4, curY, 4, rowHeight); } public boolean isNext() { if (currRow < moveRowCount - 1) return true; else return false; } public void next() { if (currRow < totalRowCount - 1) { currRow++; isChange = true; } } public boolean isPrev() { if (currRow > 0) return true; else return false; } public void prev() { if (currRow > 0) { currRow--; isChange = true; } } public boolean isNextPage() { if (currRow < totalRowCount - screenRowCount) return true; else return false; } public void nextPage() { if (currRow < totalRowCount - 1) { currRow = Math.min(totalRowCount, currRow + screenRowCount); isChange = true; } } public boolean isPrevPage() { if (currRow > 0) return true; else return false; } public void prevPage() { if (currRow > 0) { currRow = Math.max(0, currRow - screenRowCount); isChange = true; } } public void setFgColor(int fgColor) { this.fgColor = fgColor; } public void setFont(Font font) { this.font = font; } }