numberformatdemo.java

来自「《移动Agent技术》一书的所有章节源代码。」· Java 代码 · 共 983 行 · 第 1/2 页

     */
    public void workaroundSetText(TextComponent area, String newText) {
        String foo = workaround(area.getText());
        if (foo.equals(newText)) return;
        area.setText(newText);
        //if (area.gotFocus())
        //    area.select(newText.length(),newText.length());
    }

    /**
     * Update the attributes.
     */
    public void updateAttributes() {
        workaroundSetText(intMin,toString(format.getMinimumIntegerDigits()) );
        workaroundSetText(intMax,toString(format.getMaximumIntegerDigits()) );
        workaroundSetText(decMin,toString(format.getMinimumFractionDigits()) );
        workaroundSetText(decMax,toString(format.getMaximumFractionDigits()) );

        workaroundSetText(negPrefix,format.getNegativePrefix() );
        workaroundSetText(negSuffix,format.getNegativeSuffix() );
        workaroundSetText(posPrefix,format.getPositivePrefix() );
        workaroundSetText(posSuffix,format.getPositiveSuffix() );
    }

    /**
     * Get the default number formatter.
     */
    public void clickedGetDefault() {
        setFormatFromLocale();
    }
    /**
     * Update the number formatter with currency attribute.
     */
    public void clickedGetCurrency() {
        setFormatFromLocale();
    }
    /**
     * Update the number formatter with percentage attribute.
     */
    public void clickedGetPercent() {
        setFormatFromLocale();
    }
    /**
     * Update the number formatter when a new locale is selected.
     */
    public void selectedLocaleMenu() {
        setFormatFromLocale();
    }
    /**
     * If the user changes the input number, format it immediately
     */
    public void inputChanged() {
        clickedRightButton();
    }
    /**
     * If the user changes the output number, format it immediately
     */
    public void outputChanged() {
        clickedLeftButton();
    }

    /**
     * Update the text in the input area to use the new number format.
     */
    public void clickedRightButton() {
        String leftString = workaround(inputText.getText());
        Number num;

        try {
            num = new Double(leftString);
        }
        catch (IllegalArgumentException e) {
            outputText.setText("");
            inputText.selectAll();
            return;
        }
        workaroundSetText(outputText,format.format(num));
    }

    /**
     * Update the text in the output area to use the new number format.
     */
    public void clickedLeftButton() {
        String rightString = workaround(outputText.getText());
        Number num;
        ParsePosition status = new ParsePosition(1);

        try {
            num = format.parse(rightString, status);
        }
        catch (IllegalArgumentException e) {
            errorText("Exception: " + e.getClass() + e.getMessage());
            inputText.setText("");
            outputText.selectAll();
            return;
        }
        if (status.getIndex() != rightString.length()) {
            errorText("excess text: " +
                      rightString.substring(status.getIndex(),
                                            rightString.length()));
        }
        workaroundSetText(inputText, num.toString() );
    }

    /**
     * When the user changes the field containing the pattern, a new format
     * needs to be constructed from the pattern, then redisplay everything.
     */
    public void patternChanged() {
        String foo = workaround(patternText.getText());
        try {
            if (isLocalized) {
                   format.applyLocalizedPattern(foo);
                   errorText("Pattern: " + foo + " -> " +
                         format.toLocalizedPattern());
            } else {
               format.applyPattern(foo);
               errorText("Pattern: " + foo + " -> " +
                           format.toPattern());
            }
        } catch (Exception bar) {
            errorText("Exception: " + bar.getClass() + bar.getMessage());
        }
        updateAttributes();
        clickedRightButton();

    }
    //------------------------------------------------------------
    // package private
    //------------------------------------------------------------
    void addWithFont(Container container, Component foo, Font font) {
        if (font != null)
            foo.setFont(font);
        container.add(foo);
    }

    //{{DECLARE_CONTROLS
    Panel localePanel;
    CheckboxGroup group1;
    Label label1;
    Label label2;
    Label label3;
    Choice localeMenu;
    Label localeLabel;
    TextField inputText;
    TextField outputText;
    //Button rightButton;
    //Button leftButton;
    TextField patternText;
    Label label4;
    TextField negPrefix;
    TextField negSuffix;
    TextField posPrefix;
    TextField posSuffix;
    Label label5;
    Label label6;
    Label label7;
    Label label8;
    TextField intMin;
    TextField intMax;
    TextField decMin;
    TextField decMax;
    Label label9;
    Label label10;
    Label label11;
    Label label12;
    Checkbox getInstance;
    Checkbox getCurrency;
    Checkbox getPercent;
    Checkbox getLocalized;
    Label label13;
    Label label14;
    //}}
    //------------------------------------------------------------
    // private
    //------------------------------------------------------------
    private void buildGUI()
    {
        //{{INIT_CONTROLS
        setBackground(Color.white); // MD 8/7
        // shouldn't be necessary, but it is!
        setLayout(new FlowLayout(FlowLayout.CENTER,2,2));

        // INPUT/OUTPUT/PATTERN


        Panel creditPanel = new Panel();
        label1=new Label("Decimal Number Formatting Demo",
                         Label.CENTER);
        label1.setFont(Utility.titleFont);
        creditPanel.add(label1);

        label13=new Label(creditString, Label.CENTER);
        label13.setFont(Utility.creditFont);
        creditPanel.add(label13);
        Utility.fixGrid(creditPanel,1);

        add(creditPanel);

        // IO
        Panel ioPanel = new Panel();

        label3=new Label("New Number", Label.RIGHT);
        label3.setFont(Utility.labelFont);
        ioPanel.add(label3);

        outputText=new TextField(FIELD_COLUMNS);
        outputText.setFont(Utility.editFont);
        ioPanel.add(outputText);

        /*Panel gap1 = new Panel();
        gap1.setLayout(null);
        gap1.resize(5,5);
        gap1.add(outputText);

        Panel gap2 = new Panel();
        gap2.setLayout(null);
        gap2.resize(5,5);
        gap2.add(outputText);
        */

        label2=new Label("Java 1.0 Number", Label.RIGHT);
        label2.setFont(Utility.labelFont);
        ioPanel.add(label2);

        inputText=new TextField(FIELD_COLUMNS);
	inputText.addKeyListener(this);
        inputText.setFont(Utility.editFont);
        ioPanel.add(inputText);

        label4=new Label("Pattern", Label.RIGHT);
        label4.setFont(Utility.labelFont);
        ioPanel.add(label4);

        patternText=new TextField(FIELD_COLUMNS);
	patternText.addKeyListener(this);
        patternText.setFont(Utility.editFont);
        ioPanel.add(patternText);

        ioPanel.add(new Label(" "));

        getLocalized=new Checkbox("Localized Pattern");
	getLocalized.addItemListener(this);
        getLocalized.setFont(Utility.labelFont);
        ioPanel.add(getLocalized);

        Utility.fixGrid(ioPanel,2);
        add(ioPanel);

         // LOCALE

        localePanel=new Panel();

        localeLabel=new Label("Locale:");
        localeLabel.setFont(Utility.labelFont);
        localePanel.add("loc",localeLabel);

        localeMenu= new Choice();
	localeMenu.addItemListener(this);
        localeMenu.setFont(Utility.choiceFont);
        localePanel.add(localeMenu);

        // FORMAT CHECKS

        group1= new CheckboxGroup();

        getInstance=new Checkbox("Default Format",group1, false);
	getInstance.addItemListener(this);
        getInstance.setFont(Utility.labelFont);
        localePanel.add(getInstance);

        getCurrency=new Checkbox("Currency Format",group1, true);
	getCurrency.addItemListener(this);
        getCurrency.setFont(Utility.labelFont);
        localePanel.add(getCurrency);

        getPercent=new Checkbox("Percent Format",group1, false);
	getPercent.addItemListener(this);
        getPercent.setFont(Utility.labelFont);
        localePanel.add(getPercent);

        Utility.fixGrid(localePanel,1);

        Panel bottomPanel = new Panel();

        bottomPanel.add(localePanel);

        BorderPanel x = new BorderPanel();
        x.setBackground(Color.lightGray);
        x.setLayout(null);
        x.setSize(8,130);
        bottomPanel.add(x);

        // PARAMETERS

        Panel parameterPanel = new Panel();

        parameterPanel.add(new Label(" "));

        label11=new Label("Min", Label.CENTER);
        label11.setFont(Utility.labelFont);
        parameterPanel.add(label11);

        label12=new Label("Max", Label.CENTER);
        label12.setFont(Utility.labelFont);
        parameterPanel.add(label12);


        label9=new Label("Integers", Label.RIGHT);
        label9.setFont(Utility.labelFont);
        parameterPanel.add(label9);

        intMin=new TextField(4);
	intMin.addKeyListener(this);
        intMin.setFont(Utility.editFont);
        parameterPanel.add(intMin);

        intMax=new TextField(4);
	intMax.addKeyListener(this);
        intMax.setFont(Utility.editFont);
        parameterPanel.add(intMax);


        label10=new Label("Decimals", Label.RIGHT);
        label10.setFont(Utility.labelFont);
        parameterPanel.add(label10);

        decMin=new TextField(4);
	decMin.addKeyListener(this);
        decMin.setFont(Utility.editFont);
        parameterPanel.add(decMin);

        decMax=new TextField(4);
	decMax.addKeyListener(this);
        decMax.setFont(Utility.editFont);
        parameterPanel.add(decMax);


        parameterPanel.add(new Label(" "));

        label7=new Label("Prefix", Label.CENTER);
        label7.setFont(Utility.labelFont);
        parameterPanel.add(label7);

        label8=new Label("Suffix", Label.CENTER);
        label8.setFont(Utility.labelFont);
        parameterPanel.add(label8);


        label6=new Label("Positive", Label.RIGHT);
        label6.setFont(Utility.labelFont);
        parameterPanel.add(label6);

        posPrefix=new TextField(4);
	posPrefix.addKeyListener(this);
        posPrefix.setFont(Utility.editFont);
        parameterPanel.add(posPrefix);

        posSuffix=new TextField(4);
	posSuffix.addKeyListener(this);
        posSuffix.setFont(Utility.editFont);
        parameterPanel.add(posSuffix);


        label5=new Label("Negative", Label.RIGHT);
        label5.setFont(Utility.labelFont);
        parameterPanel.add(label5);

        negPrefix=new TextField(4);
	negPrefix.addKeyListener(this);
        negPrefix.setFont(Utility.editFont);
        parameterPanel.add(negPrefix);

        negSuffix=new TextField(4);
	negSuffix.addKeyListener(this);
        negSuffix.setFont(Utility.editFont);
        parameterPanel.add(negSuffix);

        Utility.fixGrid(parameterPanel,3);

        bottomPanel.add(parameterPanel);
        Utility.fixGrid(bottomPanel,3);
        Utility.setInsets(bottomPanel,x,new Insets(20,20,2,2));
        add(bottomPanel);

        Panel copyrightPanel = new Panel();
        addWithFont (copyrightPanel,new Label(copyrightString, Label.LEFT),
                     Utility.creditFont);
        addWithFont (copyrightPanel,new Label(copyrightString2, Label.LEFT),
                     Utility.creditFont);
        Utility.fixGrid(copyrightPanel,1);
        add(copyrightPanel);


    }

    private String toString( int anInt )
    {
        Integer intObj = new Integer(anInt);
        return intObj.toString();
    }

    private int parseIntField(TextComponent text) {
        int result = 0;
        try {
            Integer value = new Integer(workaround(text.getText()));
            result = value.intValue();
        }
        catch (NumberFormatException e) {
        }
        return result;
    }

    private void intMinChanged() {
        format.setMinimumIntegerDigits(parseIntField(intMin));
        updateAttributes();
        handleAttributeChange();
    }
    private void intMaxChanged() {
        format.setMaximumIntegerDigits(parseIntField(intMax));
        updateAttributes();
        handleAttributeChange();
    }
    private void decMinChanged() {
        format.setMinimumFractionDigits(parseIntField(decMin));
        updateAttributes();
        handleAttributeChange();
    }
    private void decMaxChanged() {
        format.setMaximumFractionDigits(parseIntField(decMax));
        updateAttributes();
        handleAttributeChange();
    }
    private void negPrefixChanged() {
        format.setNegativePrefix(workaround(negPrefix.getText()));
        updateAttributes();
        handleAttributeChange();
    }
    private void negSuffixChanged() {
        format.setNegativeSuffix(workaround(negSuffix.getText()));
        updateAttributes();
        handleAttributeChange();
    }
    private void posPrefixChanged() {
        format.setPositivePrefix(workaround(posPrefix.getText()));
        updateAttributes();
        handleAttributeChange();
    }
    private void posSuffixChanged() {
        format.setPositiveSuffix(workaround(posSuffix.getText()));
        updateAttributes();
        handleAttributeChange();
    }
    /**
     * Strips high bits, because of bug in Java
     */
    private static String workaround(String source) {
        StringBuffer result = new StringBuffer();
        for (int i = 0; i < source.length(); ++i)
            result.append((char)(source.charAt(i) & 0xFF));
        return result.toString();
    }

    private void errorText(String s)
    {
        if (DEBUG)
        {
          System.out.println(s);
        }
    }

    private static final String creditString =
        "v1.1a6, Demo:";
    private static final String copyrightString =
        "";
    private static final String copyrightString2 =
        "";
    private static final int FIELD_COLUMNS = 35;

    private static final boolean DEBUG = false;

    private static boolean isLocalized = false;

    // private Choice formatter, locale;

    private DecimalFormat format;
    private Locale[] locales;
    private DemoApplet applet;

}