package com.shili.util;

public class PageUtil {
	//總條數
	private int count;
	//總導航數 
	private int navCount;
	//起始行 當前也頁碼顯示的資料開始的條數 為了在資料庫裡用limit查詢資料使用
	private int startRow;
	//每頁顯示條數
	private int pageRow=16;
	//當前頁
	private int curPage;
	//首頁
	private int firstPage=1;
	//尾頁
	private int lastPage;
	//前一頁
	private int prePage;
	//後一頁
	private int nextPage;
	//起始導航
	private int startNav;
	//結束導航
	private int endNav;
	
	//建立物件的時候  該物件的所有屬性自動初始化好
	/**
	 * 
	 * @param count   資料的總條數   由資料庫中查出
	 * @param curPage  當前頁   由頁面傳入
	 */
	public PageUtil(int count, int curPage){
		this.count=count;//總條數
		this.curPage=curPage;//當前頁 
		this.navCount=this.count%this.pageRow>0?this.count/this.pageRow+1:this.count/this.pageRow;//總導航數 
		this.startRow=(this.curPage-1)*this.pageRow;//起始行 當前也頁碼顯示的資料開始的條數
		this.lastPage=this.navCount;//尾頁
		this.prePage=this.curPage<=this.firstPage?this.firstPage:this.curPage-1;//前一頁
		this.nextPage=this.curPage>=this.lastPage?this.lastPage:this.curPage+1;//後一頁
		if(this.navCount<10){
			//不足十頁的情況
			this.startNav=this.firstPage;//起始導航
			this.endNav=this.lastPage;//結束導航
		}else{
			if(this.curPage<=6){
				//靠近首頁的情況
				this.startNav=this.firstPage;
				this.endNav=10;
			}else if(this.curPage>=this.lastPage-4){
				//靠近尾頁的情況
				this.startNav=this.lastPage-9;
				this.endNav=this.lastPage;
			}else{
				this.startNav=this.curPage-5;
				this.endNav=this.curPage+4;
			}
		}
	}
	public int getCount() {
		return count;
	}
	public void setCount(int count) {
		this.count = count;
	}
	public int getNavCount() {
		return navCount;
	}
	public void setNavCount(int navCount) {
		this.navCount = navCount;
	}
	public int getStartRow() {
		return startRow;
	}
	public void setStartRow(int startRow) {
		this.startRow = startRow;
	}
	public int getPageRow() {
		return pageRow;
	}
	public void setPageRow(int pageRow) {
		this.pageRow = pageRow;
	}
	public int getCurPage() {
		return curPage;
	}
	public void setCurPage(int curPage) {
		this.curPage = curPage;
	}
	public int getFirstPage() {
		return firstPage;
	}
	public void setFirstPage(int firstPage) {
		this.firstPage = firstPage;
	}
	public int getLastPage() {
		return lastPage;
	}
	public void setLastPage(int lastPage) {
		this.lastPage = lastPage;
	}
	public int getPrePage() {
		return prePage;
	}
	public void setPrePage(int prePage) {
		this.prePage = prePage;
	}
	public int getNextPage() {
		return nextPage;
	}
	public void setNextPage(int nextPage) {
		this.nextPage = nextPage;
	}
	public int getStartNav() {
		return startNav;
	}
	public void setStartNav(int startNav) {
		this.startNav = startNav;
	}
	public int getEndNav() {
		return endNav;
	}
	public void setEndNav(int endNav) {
		this.endNav = endNav;
	}
	
}