paginationsupport.java

Extjs2增删改查

package com.tcg.core;

import java.util.List;
import java.util.ArrayList;

/**
 * Created by IntelliJ IDEA.
 * UserSession: Administrator
 * Date: 2007-9-4
 * Time: 16:07:50
 * To change this template use File | Settings | File Templates.
 */
public class PaginationSupport {
    public final static int PAGESIZE = 15;

    private int pageSize = PAGESIZE;

    private List items;

    private int totalCount;

    private int[] indexes = new int[0];

    private int startIndex = 0;

    public PaginationSupport(List items, int totalCount) {
        this(items, totalCount, 0);
    }

    public PaginationSupport(List items, int totalCount, int startIndex) {
        this(items, totalCount,PAGESIZE, startIndex);
    }

    public PaginationSupport(List items, int totalCount, int startIndex, int pageSize) {
        setPageSize(pageSize);
        setTotalCount(totalCount);
        setItems(items);
        setStartIndex(startIndex);
    }

    public List getItems() {
        if(items == null) items = new ArrayList();
        return items;
    }

    public void setItems(List items) {
        this.items = items;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public int getTotalCount() {
        return totalCount;
    }

    public int getTotalPage() {
        int count = totalCount / pageSize;
        if (totalCount % pageSize > 0)
            count++;
        return count;
    }

    public int getCurrentPage() {
        int count = (startIndex+1) / pageSize;
        if ((startIndex+1) % pageSize > 0)
            count++;
        if(count > getTotalPage()) count = getTotalPage();
        return count;
    }

    public int getNextPage() {
        int no = getCurrentPage();
        if(no < getTotalPage()) no ++;
        return no;
    }

    public int getPreviousPage() {
        int no = getCurrentPage();
        if(no > 1) no --;
        return no;
    }

    public String getPreviousable() {
        return getCurrentPage()==1?"disabled":"";
    }

    public String getNextable() {
        return getCurrentPage()==getTotalPage()?"disabled":"";
    }

    public void setTotalCount(int totalCount) {
        if (totalCount > 0) {
            this.totalCount = totalCount;
            int count = totalCount / pageSize;
            if (totalCount % pageSize > 0)
                count++;
            indexes = new int[count];
            for (int i = 0; i < count; i++) {
                indexes[i] = pageSize * i;
            }
        } else {
            this.totalCount = 0;
        }
    }

    public int[] getIndexes() {
        return indexes;
    }

    public void setIndexes(int[] indexes) {
        this.indexes = indexes;
    }

    public int getStartIndex() {
        return startIndex;
    }

    public void setStartIndex(int startIndex) {
        if (totalCount <= 0)
            this.startIndex = 0;
        else if (startIndex >= totalCount)
            this.startIndex = indexes[indexes.length - 1];
        else if (startIndex < 0)
            this.startIndex = 0;
        else {
            this.startIndex = indexes[startIndex / pageSize];
        }
    }

    public int getNextIndex() {
        int nextIndex = getStartIndex() + pageSize;
        if (nextIndex >= totalCount)
            return getStartIndex();
        else
            return nextIndex;
    }

    public int getPreviousIndex() {
        int previousIndex = getStartIndex() - pageSize;
        if (previousIndex < 0)
            return 0;
        else
            return previousIndex;
    }

    public List getViewPageLabels() {
        List list = new ArrayList();

        int firstNo = (getCurrentPage()/10)*10+1;
        int lastNo = (getCurrentPage()/10)*10+10;
        if(lastNo > getTotalPage()){
            lastNo = getTotalPage();
        }
        while(firstNo <= lastNo){
            list.add(firstNo);
            firstNo ++;
        }

        return list;
    }

}