chapterscreen.java

来自「J2ME MIDP_Example_Applications」· Java 代码 · 共 89 行

// Copyright 2003 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
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// Furthermore, information provided in this source code is preliminary,
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// retains the right to make changes to this source code at
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import javax.microedition.lcdui.*;

// The chapter screen displays one chapter and allows one to navigate
// to other chapters.
class ChapterScreen
    extends Form
    implements CommandListener
{
    private final BookReaderMIDlet midlet;
    private final Command exitCommand = new Command("Exit", Command.EXIT, 1);
    private final Command backCommand = new Command("Back", Command.BACK, 1);
    private final Command nextCommand = new Command("Next", Command.SCREEN, 1);
    private final Command prevCommand = new Command("Previous", Command.SCREEN, 2);
    private final int index;


    ChapterScreen(BookReaderMIDlet midlet, Chapter chapter)
    {
        super(chapter.getTitle());

        this.midlet = midlet;

        append(new StringItem("", chapter.getContent()));
        index = chapter.getIndex();

        setCommandListener(this);
        addCommand(exitCommand);
        addCommand(backCommand);
        addCommand(nextCommand);
        addCommand(prevCommand);
    }


    public void commandAction(Command command, Displayable displayable)
    {
        if (command == exitCommand)
        {
            midlet.destroyApp(true);
        }
        else if (command == backCommand)
        {
            midlet.displayBook();
        }
        else if (command == prevCommand)
        {
            midlet.displayChapter(index - 1);
        }
        else if (command == nextCommand)
        {
            midlet.displayChapter(index + 1);
        }
    }
}