tv.dyndns.kishibe.qmaclone.client.ui.WidgetPageSelector.java Source code

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Here is the source code for tv.dyndns.kishibe.qmaclone.client.ui.WidgetPageSelector.java

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//The MIT License
//
//Copyright (c) 2009 nodchip
//
//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:
//
//The above copyright notice and this permission notice shall be included in
//all copies or substantial portions of the Software.
//
//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//THE SOFTWARE.
package tv.dyndns.kishibe.qmaclone.client.ui;

import java.util.HashMap;
import java.util.Map;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Widget;

public class WidgetPageSelector extends HorizontalPanel implements ClickHandler {
    private static final String STYLE = "pageSelectButton";
    private final PageSelectable selectable;
    private final Map<Button, Integer> buttonToPageNumber = new HashMap<Button, Integer>();
    private final int numberOfPage;

    public WidgetPageSelector(PageSelectable selectable, int numberOfPage) {
        this.selectable = selectable;
        this.numberOfPage = numberOfPage;
        if (numberOfPage <= 1) {
            setVisible(false);
        }
    }

    /**
     * ??
     * 
     * @param page
     *            ???(0)
     * @param numberOfPage
     *            ?
     */
    public void setPage(int page) {
        clear();
        buttonToPageNumber.clear();

        // 
        if (page > 5) {
            Button button = new Button("&lt;&lt;", this);
            button.setTitle("?");
            button.addStyleName(STYLE);
            buttonToPageNumber.put(button, 0);
            add(button);
        }

        // 5?
        if (page > 4) {
            Button button = new Button("&lt;", this);
            button.setTitle("5??");
            button.addStyleName(STYLE);
            buttonToPageNumber.put(button, page - 5);
            add(button);
        }

        // ????
        {
            int beginPage = Math.max(0, page - 4);
            int endPage = Math.min(numberOfPage, page + 5);
            for (int p = beginPage; p < endPage; ++p) {
                Button button = new Button("" + (p + 1), this);
                button.addStyleName(STYLE);
                buttonToPageNumber.put(button, p);
                add(button);

                if (p == page) {
                    button.setEnabled(false);
                }
            }
        }

        // 5
        if (page < numberOfPage - 5) {
            Button button = new Button("&gt;", this);
            button.setTitle("5?");
            button.addStyleName(STYLE);
            buttonToPageNumber.put(button, page + 5);
            add(button);
        }

        // 
        if (page < numberOfPage - 6) {
            Button button = new Button("&gt;&gt;", this);
            button.setTitle("?");
            button.addStyleName(STYLE);
            buttonToPageNumber.put(button, numberOfPage - 1);
            add(button);
        }

        selectable.selectPage(page);
    }

    public void deselect() {
        for (Button button : buttonToPageNumber.keySet()) {
            button.setEnabled(true);
        }
    }

    @Override
    public void onClick(ClickEvent event) {
        Widget sender = (Widget) event.getSource();
        if (buttonToPageNumber.containsKey(sender)) {
            int page = buttonToPageNumber.get(sender);
            setPage(page);
            selectable.selectPage(page);
        }
    }
}