settingsscreen.java

J2ME MIDP_Example_Applications

// Copyright 2003 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
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// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE
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// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT
// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED
// BY THIRD PARTIES
//
// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
//
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// Corporation.
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// Sun Microsystems, Inc.
// Other product and company names mentioned herein may be trademarks or
// trade names of their respective owners.
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import javax.microedition.lcdui.*;


class SettingsScreen
    extends Form
    implements CommandListener, ItemStateListener
{              
    private static final int DE = 0;
    private static final int EN = 1;
    private static final int ES = 2;
    private static final int FR = 3;
    private static final int IT = 4;
    private static final int PT = 5;    
    private static final String[] inputLocaleStrings = { "de",
                                                         "en",
                                                         "es",
                                                         "fr",
                                                         "it",
                                                         "pt" };       
    private static final String[][] outputLocaleArray =
        {
            {"en", "fr"} ,                     // row DE: "de" to ...
            {"de", "es", "fr", "it", "pt" } ,  // row EN: "en" to ...
            {"en"} ,                           // row ES: "es" to ...
            {"de", "en"},                      // row FR: "fr" to ...
            {"en"} ,                           // row IT: "it" to ...
            {"en"}                             // row PT: "pt" to ...
        };     
       
    // The default translation setting is from "en" to "fr"
    static final String DEFAULT_INPUT_LOCALE = "en";
    static final String DEFAULT_OUTPUT_LOCALE =
                            outputLocaleArray[EN][2]; // "fr"
      
    private final Command cancelCommand;
    private final Command applyCommand;
    private final TranslatorMIDlet midlet;
    
    private ChoiceGroup inputLocaleChoiceGroup;
    private ChoiceGroup outputLocaleChoiceGroup;
    private int row = EN;
    private int column = 2; // "fr" (see DEFAULT_OUTPUT_LOCALE above)
    

    SettingsScreen(TranslatorMIDlet midlet)
    {
        // (this.titleString() can't be referenced
        // until after super() is called)
        super(null);
        setTitle(titleString());
                              
        this.midlet = midlet;
        
        // Add the input locale setting choices
        inputLocaleChoiceGroup = new ChoiceGroup("Input locale",
                                                 ChoiceGroup.EXCLUSIVE,
                                                 inputLocaleStrings,
                                                 null);
        inputLocaleChoiceGroup.setSelectedIndex(row, true);                                                 
        append(inputLocaleChoiceGroup);
       
        // Add the output locale setting choices
        // (based on input locale selected)
        outputLocaleChoiceGroup = makeOutputLocaleChoiceGroup(
                                      outputLocaleArray[row], 
                                      0);
        outputLocaleChoiceGroup.setSelectedIndex(column, true);    
        append(outputLocaleChoiceGroup);        

        setItemStateListener(this);                                               

        // Add the screen commands
        cancelCommand = new Command("Cancel", Command.BACK, 1);
        addCommand(cancelCommand);
        applyCommand = new Command("Use settings", Command.SCREEN, 1);
        addCommand(applyCommand);
        setCommandListener(this);
    }
    
    
    private String titleString()
    {
        return ("Settings: " + inputLocaleStrings[row] + 
                " to " +
                outputLocaleArray[row][column]);
    }
    
    
    private ChoiceGroup makeOutputLocaleChoiceGroup(String[] strings,
                                                    int selectedIndex)
    {
        ChoiceGroup cg = new ChoiceGroup("Output locale",
                                         ChoiceGroup.EXCLUSIVE,
                                         strings,
                                         null);
        cg.setSelectedIndex(selectedIndex, true);
        
        return cg;
    }
    
    
    public void itemStateChanged(Item item)
    {
        row = inputLocaleChoiceGroup.getSelectedIndex();
        if (item == inputLocaleChoiceGroup)
        {
            // replace old output locale choices
            delete(1);
            outputLocaleChoiceGroup = makeOutputLocaleChoiceGroup(
                                          outputLocaleArray[row],
                                          0);
            append(outputLocaleChoiceGroup);
            column = 0;
        }
        else
        {
            column = outputLocaleChoiceGroup.getSelectedIndex();
        }
        setTitle(titleString());
    }

    
    public void commandAction(Command command, Displayable d)
    {
        if (command == cancelCommand)
        {
            midlet.settingsScreenBack();
        }
        else
        {
            // applyCommand: 'Use settings'

            String inputLocale = inputLocaleStrings[row];
            String outputLocale =
                outputLocaleArray[row][column];
            midlet.settingsScreenSave(inputLocale, outputLocale);
        }
    }
}