AJPager.java

package org.arong.egdownloader.ui.swing;

import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextField;

import org.arong.util.NumberUtil;
/**
 * 分页组件
 * @author dipoo
 * @since 2015-03-12
 */
public class AJPager extends JPanel {

	private static final long serialVersionUID = 3076829356987409789L;
	
	private Integer pageCount;//总页数
	
	private Integer currentPage;//当前页数
	
	private Integer next;//下一页
	
	private Integer prev;//上一页
	
	private Integer maxPage = 11;
	
	//分页选项左边界
	private Integer minBound;
	
	//分页选项右边界
	private Integer maxBound;
	
	private Object data;
	
	private ActionListener pageListener;
	
	public AJPager(int x, int y, int width, int height, ActionListener pageListener){
		this.setBounds(x, y, width, height);
		this.pageListener = pageListener;
		this.setLayout(new FlowLayout());
	}
	
	public void change( Integer countPage, Integer current){
		pageCount = countPage;
		currentPage = current;
		if(currentPage == null){
			currentPage = 1;
		}else{
			if(currentPage >= pageCount){
				currentPage = pageCount;
			}
			if(currentPage < 1){
				currentPage = 1;
			}
		}
		
		next = currentPage + 1;
		
		if(next > pageCount){
			next = pageCount;
		}
		
		prev = currentPage - 1;
		if(prev < 1){
			prev = 1;
		}
		
		if(pageCount <= maxPage){
			minBound = 1;
			maxBound = pageCount;
		}else{
			//增加因子，最大分页数中间距两边距离
			Integer m = maxPage / 2;
			//初步过滤
			//过滤左边界
			if(currentPage - m < 1){
				minBound = 1;
			}else{
				minBound = currentPage - m;
			}
			//过滤右边界
			if(currentPage + m > pageCount){
				maxBound = pageCount;
			}else{
				maxBound = currentPage + m;
			}
			//二次过滤
			if(minBound.equals(1)){
				maxBound = maxPage;
			}
			if(maxBound.equals(pageCount)){
				minBound = maxBound - maxPage + 1;
			}
		}
		this.removeAll();
		
		JButton fbtn = new AJButton("首页");
		fbtn.setName("1");
		fbtn.setToolTipText("1");
		if(pageListener != null){
			fbtn.addActionListener(pageListener);
		}
		this.add(fbtn);
		
		if(prev >= 1){
			JButton btn = new AJButton("上一页");
			btn.setName(prev + "");
			btn.setToolTipText(prev + "");
			if(pageListener != null){
				btn.addActionListener(pageListener);
			}
			this.add(btn);
		}
		for(int i = minBound; i <= maxBound; i++ ){
			JButton btn = new AJButton("" + i + "");
			btn.setName(i + "");
			if(i == currentPage){
				btn.setUI(AJButton.blueBtnUi);
			}else{
				btn.setUI(AJButton.greenBtnUi);
				if(pageListener != null){
					btn.addActionListener(pageListener);
				}
			}
			this.add(btn);
		}
		if(next <= pageCount){
			JButton btn = new AJButton("下一页");
			btn.setToolTipText(next + "");
			btn.setName(next + "");
			if(pageListener != null){
				btn.addActionListener(pageListener);
			}
			this.add(btn);
		}
		
		JButton lbtn = new AJButton("尾页");
		lbtn.setName(pageCount + "");
		lbtn.setToolTipText(pageCount + "");
		if(pageListener != null){
			lbtn.addActionListener(pageListener);
		}
		this.add(lbtn);
		
		final JButton hidebtn = new JButton("");
		hidebtn.setName(pageCount + "");
		hidebtn.setToolTipText(pageCount + "");
		if(pageListener != null){
			hidebtn.addActionListener(pageListener);
		}
		hidebtn.setVisible(false);
		this.add(hidebtn);
		
		final JTextField pageTf = new JTextField(currentPage + "");
		pageTf.setLayout(null);
		final JPanel this_ = this;
		final int total = pageCount;
		pageTf.addKeyListener(new KeyAdapter() {
			public void keyPressed(KeyEvent e) {
				this_.updateUI();
				if(e.getKeyCode() == KeyEvent.VK_ENTER){
					if(NumberUtil.can2Int(pageTf.getText().trim())){
						Integer current = Integer.parseInt(pageTf.getText().trim());
						if(current <= total){
							hidebtn.setName(pageTf.getText().trim());
						}else{
							hidebtn.setName(total + "");
							pageTf.setText(total + "");
						}
						hidebtn.doClick();
					}
				}
			}
		});
		this.add(pageTf);
	}
	
	
	public void setPageCount(Integer pageCount) {
		this.pageCount = pageCount;
	}


	public Integer getPageCount() {
		return pageCount;
	}


	public void setPageListener(ActionListener pageListener) {
		this.pageListener = pageListener;
	}


	public ActionListener getPageListener() {
		return pageListener;
	}

	public void setCurrentPage(Integer currentPage) {
		this.currentPage = currentPage;
	}

	public Integer getCurrentPage() {
		return currentPage;
	}

	public Integer getNext() {
		return next;
	}

	public Integer getPrev() {
		return prev;
	}

	public void setMaxPage(Integer maxPage) {
		this.maxPage = maxPage;
	}

	public Integer getMaxPage() {
		return maxPage;
	}

	public Integer getMinBound() {
		return minBound;
	}

	public Integer getMaxBound() {
		return maxBound;
	}

	public void setData(Object data) {
		this.data = data;
	}

	public Object getData() {
		return data;
	}

}