package com.freewebsys.blog.template;
import java.util.List;
import com.freewebsys.blog.page.PageConf;
import freemarker.template.TemplateMethodModel;
import freemarker.template.TemplateModelException;
public class PageBarDirective implements TemplateMethodModel {
public PageBarDirective() {
}
public Object exec(List args) throws TemplateModelException {
String str = "";
if (null != args && args.size() == 2) {
// 第1位是格式.
}
return str;
}
private static String buttonBegin = "<a class=\"pageNum\" href=\"";
/**
* 发布到线上多个跳转按钮方法,如1，2，3，4，5这样的按钮跳转最大7页跳转
*/
/**
* 生成多个跳转按钮方法,如1，2，3，4，5这样的按钮跳转最大7页跳转
*/
public static String genCenterButtons(int start, int limit, int total,
String baseUrl) {
// 初始化参数.每次独立计算.否则分页有问题.
PageConf pageConf = new PageConf(start, limit, total);
PageConf pageConfTemp1 = new PageConf(start, limit, total);
PageConf pageConfTemp2 = new PageConf(start, limit, total);
// 结束页
PageConf pageConfTempLast = new PageConf(start, limit, total);
//
pageConfTempLast.getLast();
// 字符串拼写.
StringBuilder strOut = new StringBuilder();
// 设置开始为当前页往前3页,最小1
int begin = Math.max(1, (pageConf.getCurrentPage() + 1) - 3);
// 设置结束为当前页往后3页,最大到总页数
int end = Math.min((pageConf.getCurrentPage() + 1) + 3,
pageConf.getTotalPage());
int abs = 5 - Math.abs(pageConfTempLast.getCurrentPage()
- pageConf.getCurrentPage());
if (abs > 0) {
begin = pageConf.getCurrentPage() - abs;
begin = Math.min(begin, (pageConf.getCurrentPage() + 1) - 3);
begin = Math.max(1, begin);
}
// 计算当前页和首页的距离
abs = 7 - pageConf.getCurrentPage();
if (abs > 0) {
end = pageConf.getCurrentPage() + abs;
end = Math.max((pageConf.getCurrentPage() + 1) + 3, end);
end = Math.min(end, pageConf.getTotalPage());
}
if (pageConfTemp1.hasPrevious()) {
pageConfTemp1.getPrevious();
strOut.append(buttonBegin + "start=" + pageConfTemp1.getStart()
+ "'\">");
strOut.append("\u524d\u4e00\u9875</a>");// 上一页
} else {
strOut.append("<a class='prev-page disabled'>\u524d\u4e00\u9875</a>");
}
if (pageConf.getTotalPage() > 7) {// 如果大于7显示首页末页
// 显示前一页
if (pageConf.getCurrentPage() > 3) {
// 显示第 1
strOut.append(buttonBegin + baseUrl + "index.html'\">");
strOut.append(1);
strOut.append("</a>");
if (pageConf.getCurrentPage() > 4) {
// 显示第 2 页
strOut.append(buttonBegin + baseUrl + "index"
+ pageConf.getCurrentPage() + ".html" + "\">");
strOut.append(2);
strOut.append("</a>");
}
strOut.append("<span>\u2026</span>");
}
}
// if(pageConf.getCurrentPage())
// 循环显示数字
for (int i = begin; i <= end; i++) {
// 循环多个table的button
int startTemp = (i - 1) * pageConf.getLimit();
if (i == (pageConf.getCurrentPage() + 1)) {
strOut.append("<span class='paging-input'><input onkeyup=\"this.value=this.value.replace(/[^0-9]/g,'')\" class='current-page' type='text' name='page_num' value='");
strOut.append(i);// 当前页显示禁用
strOut.append("' size='1' onchange=\"window.location.href='");
strOut.append("start=");
strOut.append("'+(this.value-1)*" + pageConf.getLimit()
+ ";\"></span>\n");
} else {
strOut.append(buttonBegin + "start=" + startTemp + "'\">");
strOut.append(i);
strOut.append("</a>\n");
}
}
// 末页显示,显示最后一页和倒数第二页
if (pageConf.getTotalPage() > 7) {// 如果大于7显示首页末页
if (pageConf.getCurrentPage() < (pageConfTempLast.getCurrentPage() - 3)) {
// 如果当前页是倒数第4页就不显示
strOut.append("…");
// System.out.println(pageConf.getCurrentPage() + "/"
// + pageConfTempLast.getCurrentPage());
if (pageConf.getCurrentPage() < (pageConfTempLast
.getCurrentPage() - 4)) {
// 如果当前页是倒数第4页就不显示倒数第2页
strOut.append(buttonBegin
+ "start="
+ (pageConfTempLast.getStart() - pageConf
.getLimit()) + "'\">");
strOut.append(pageConfTempLast.getCurrentPage());
strOut.append("</a>\n");
}
strOut.append(buttonBegin + "start="
+ pageConfTempLast.getStart() + "'\">");
strOut.append(pageConfTempLast.getCurrentPage() + 1);
strOut.append("</a>\n");
}
}
// 显示下一页
if (pageConfTemp2.hasNext()) {
pageConfTemp2.getNext();
strOut.append(buttonBegin + "start=" + pageConfTemp2.getStart()
+ "'\">");
strOut.append("\u4e0b\u4e00\u9875</a>\n");// 下一页
} else {
strOut.append("<a class='prev-page disabled'>\u4e0b\u4e00\u9875</a>\n");
}
return strOut.toString();
}
public static void main(String[] args) {
System.out.println(genCenterButtons(0, 10, 128, "/blog/"));
}
}