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package com.ksyzt.gwt.client.common;

import java.io.Serializable;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.uibinder.client.UiConstructor;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TextBox;
import com.ksyzt.gwt.client.event.HasMessageHandlers;
import com.ksyzt.gwt.client.event.MessageEvent;
import com.ksyzt.gwt.client.event.MessageHandler;

// TODO: Auto-generated Javadoc

/**
 * 网页的导航条 首页 上一页 [3/10] 下一页 尾页 【】页GO.
 *
 * @author 张建设
 */
public class PageNaviBar extends HorizontalPanel implements HasMessageHandlers {

    /**
     * The Class NaviData.
     */
    public class NaviData implements Serializable {

        /**
         * The page.
         */
        public int page;

        /**
         * The size.
         */
        public int size;

        /**
         * Instantiates a new navi data.
         *
         * @param page the page
         * @param size the size
         */
        public NaviData(int page, int size) {
            this.page = page;
            this.size = size;
        }
    }

    /**
     * The first.
     */
    Anchor first;

    /**
     * The prev.
     */
    Anchor prev;

    /**
     * The next.
     */
    Anchor next;

    /**
     * The last.
     */
    Anchor last;

    /**
     * The txt page.
     */
    TextBox txtPage;

    /**
     * The btn go.
     */
    Button btnGo;

    /**
     * The lb info.
     */
    Label lbInfo;

    /**
     * The m go click.
     */
    private ClickHandler m_go_click = new ClickHandler() {

        public void onClick(ClickEvent event) {

            Integer num = Integer.valueOf(txtPage.getValue());
            if (num >= 1 && num <= m_pages + 1) {
                firePage(num - 1);
            }

        }
    };

    /**
     * Fire page.
     *
     * @param page the page
     */
    private void firePage(int page) {
        NaviData data = new NaviData(page, m_pagesize);
        MessageEvent ev = new MessageEvent(MessageEvent.PAGE, data);
        fireEvent(ev);
        renderState(page, m_pages);
    }

    /**
     * The m first click.
     */
    private ClickHandler m_first_click = new ClickHandler() {

        public void onClick(ClickEvent event) {

            firePage(0);
        }
    };

    /**
     * The m prev click.
     */
    private ClickHandler m_prev_click = new ClickHandler() {

        public void onClick(ClickEvent event) {
            m_currentpage--;
            firePage(m_currentpage);
        }
    };

    /**
     * The m next click.
     */
    private ClickHandler m_next_click = new ClickHandler() {

        public void onClick(ClickEvent event) {
            m_currentpage++;
            firePage(m_currentpage);
        }
    };

    /**
     * The m last click.
     */
    private ClickHandler m_last_click = new ClickHandler() {

        public void onClick(ClickEvent event) {
            m_currentpage = m_pages - 1;
            firePage(m_currentpage);
        }
    };

    /**
     * Instantiates a new page navi bar.
     */
    @UiConstructor
    public PageNaviBar() {
        super();
        this.setSpacing(3);
        init();
    }

    /**
     * Inits the.
     */
    private void init() {
        first = new Anchor("首页");
        first.addClickHandler(m_first_click);
        this.add(first);

        prev = new Anchor("上一页");
        prev.addClickHandler(m_prev_click);
        this.add(prev);

        lbInfo = new Label("/");
        lbInfo.setWidth("80px");
        this.add(lbInfo);
        this.setCellHorizontalAlignment(lbInfo,
                HasHorizontalAlignment.ALIGN_CENTER);

        next = new Anchor("下一页");
        next.addClickHandler(m_next_click);
        this.add(next);

        last = new Anchor("尾页");
        last.addClickHandler(m_last_click);
        this.add(last);

        txtPage = new TextBox();
        txtPage.setWidth("40px");
        this.add(txtPage);
        btnGo = new Button("Go");
        btnGo.addClickHandler(m_go_click);
        this.add(btnGo);

        first.setEnabled(false);
        next.setEnabled(false);
        prev.setEnabled(false);
        last.setEnabled(false);
        btnGo.setEnabled(false);

    }

    /* (non-Javadoc)
     * @see com.ksyzt.gwt.client.event.HasMessageHandlers#addMessageHandler(com.ksyzt.gwt.client.event.MessageHandler)
     */
    public HandlerRegistration addMessageHandler(MessageHandler handler) {
        return addHandler(handler, MessageEvent.TYPE);
    }

    /**
     * The m currentpage.
     */
    int m_currentpage;

    /**
     * The m pages.
     */
    int m_pages;

    /**
     * The m pagesize.
     */
    int m_pagesize;

    /**
     * Sets the data.
     *
     * @param currentPage the current page
     * @param total       the total
     * @param pagesize    the pagesize
     */
    public void setData(int currentPage, int total, int pagesize) {
        m_pagesize = pagesize;
        m_currentpage = currentPage;
        int pages = 0;

        pages = total / pagesize;
        m_pages = pages;

        renderState(currentPage, pages);
    }

    /**
     * Render state.
     *
     * @param currentPage the current page
     * @param pages       the pages
     */
    private void renderState(int currentPage, int pages) {
        if (currentPage >= 0 && currentPage <= pages) {
            txtPage.setText((currentPage + 1) + "");
            lbInfo.setText((currentPage + 1) + "/" + (pages + 1));
            btnGo.setEnabled(true);

            if (currentPage == 0) {
                first.setEnabled(false);
            } else {
                first.setEnabled(true);
            }

            if (currentPage == pages) {
                last.setEnabled(false);
            } else {
                last.setEnabled(true);
            }

            if (currentPage < pages) {
                next.setEnabled(true);
            } else {
                next.setEnabled(false);
            }

            if (currentPage > 0) {
                prev.setEnabled(true);
            } else {
                prev.setEnabled(false);
            }

        } else {
            first.setEnabled(false);
            next.setEnabled(false);
            prev.setEnabled(false);
            last.setEnabled(false);
            btnGo.setEnabled(false);
        }
    }
}