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## org.faceless.pdf2
Class FormRadioButton

    java.lang.Object
      org.faceless.pdf2.FormElement
          org.faceless.pdf2.FormRadioButton

All Implemented Interfaces:
  Cloneable

    public final class FormRadioButton

extends FormElement

A type of form element representing a Radio Button, which can be either "checked" or "cleared" (on or off), in the same way as the HTML "radiobutton" input type. Unlike Checkboxes, at least one annotation for each Radio Button must be set.

Here's an example showing how to add a set of RadioButtons to a form

       FormRadioButton ccard = new FormRadioButton();
       ccard.addAnnotation("Mastercard", page, 100, 100, 110, 110);
       ccard.addAnnotation("Visa",       page, 120, 100, 130, 110);
       ccard.addAnnotation("Amex",       page, 140, 100, 150, 110);
       form.addElement("CreditCard", ccard);

and here's how to determine which of those values is checked

       Form form = pdf.getForm();
       FormRadioButton ccard = (FormRadioButton)form.getElement("CreditCard");
       String value = ccard.getValue();   // May be null if none are checked

Since:
  1.1.23

Constructor Summary
`FormRadioButton()` Create a new FormRadioButton element.

Method Summary
`WidgetAnnotation` | `addAnnotation(String value, PDFPage page, float x1, float y1, float x2, float y2)` Add an annotation to the Checkbox or RadioButton.
`String` | `getDefaultValue()` Return the default value of this field, or `null`if no default value exists.``
`Map` | `getOptions()` Return a read-only Map containing the values (annotations) that can be selected in this RadioButton or Checkbox.
`String` | `getValue()` Get the value of this field.
`boolean` | `isNoToggleToOff()` Return true if the "NoToggleToOff" flag is set, which means it should not be possible to set the value of this field to null by clicking on an already selected Radio Button.
`boolean` | `isRadiosInUnison()` Return true if the "RadiosInUnison" flag is set, which means fields with the same value are all turned on or off in unison (if one is chcked, they are all checked).
`void` | `rebuild()` Cause the annotations to be rebuilt.
`void` | `setDefaultValue(String value)` Set the default value for this field.
`void` | `setRadiosInUnison(boolean flag)` Set the value of the "RadiosInUnison" flag, as returned by `isRadiosInUnison()`
`void` | `setValue(String value)` Mark the specified annotation for the Checkbox/RadioButton as selected, and unselect any others.
`String` | `toString()`

Methods inherited from class org.faceless.pdf2.FormElement
`addPropertyChangeListener, duplicate, flatten, getAction, getAnnotation, getAnnotations, getDescription, getForm, isReadOnly, isRequired, isSubmitted, removePropertyChangeListener, setAction, setDescription, setReadOnly, setRequired, setSubmitted`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### FormRadioButton

    public FormRadioButton()

  Create a new FormRadioButton element. Any annotations must be positioned explicitly by calling the `addAnnotation(java.lang.String, org.faceless.pdf2.PDFPage, float, float, float, float)` method.

  Since:
    1.1.26

Method Detail

### isRadiosInUnison

    public boolean isRadiosInUnison()

  Return true if the "RadiosInUnison" flag is set, which means fields with the same value are all turned on or off in unison (if one is chcked, they are all checked).

  Since:
    2.10.6

### setRadiosInUnison

    public void setRadiosInUnison(boolean flag)

  Set the value of the "RadiosInUnison" flag, as returned by `isRadiosInUnison()`

  Since:
    2.10.6

### setValue

    public void setValue(String value)

  Mark the specified annotation for the Checkbox/RadioButton as selected, and unselect any others. The specified value must be the the `value` of one of this field's `WidgetAnnotation` objects, otherwise an an `IllegalArgumentException` is thrown.

  Parameters:
    `value` - the value of the annotation to select, or `null` to turn them all off

### setDefaultValue

    public void setDefaultValue(String value)

  Set the default value for this field. Fields revert to their default value when the `PDFAction.formReset()` action is invoked. See `setValue(java.lang.String, java.lang.String)` for a discussion of which values are valid.

  Parameters:
    `value` - the value of the annotation to select, or `null` to turn them all off

### getValue

    public String getValue()

  Get the value of this field. This will be the value of the selected RadioButton/Checkbox annotation, or `null` if no annotation is selected.

  Returns:
    the value of the selected annotation, or `null` if none is selected

### getDefaultValue

    public String getDefaultValue()

  Return the default value of this field, or `null`if no default value exists.

  ``
  Returns:
    the default value of this field, or `null` if none is specified

### getOptions

    public Map getOptions()

  Return a read-only Map containing the values (annotations) that can be selected in this RadioButton or Checkbox. As each annotation's value can be checked by iterating through the list returned from `FormElement.getAnnotations()`, this method is not strictly necessary, but it's a little more convenient and intuitive so we've left it in.

### rebuild

    public void rebuild()

  Description copied from class: `FormElement`
  Cause the annotations to be rebuilt. Unless you're rendering the annotation using the viewer, it's not necessary to call this method.

### isNoToggleToOff

    public boolean isNoToggleToOff()

  Return true if the "NoToggleToOff" flag is set, which means it should not be possible to set the value of this field to null by clicking on an already selected Radio Button. Note this flag is a legacy (you should use a FormCheckbox if you want this functionality) and so cannot be set.

  Since:
    2.11.14

### addAnnotation

    public WidgetAnnotation addAnnotation(String value,
                                          PDFPage page,
                                          float x1,
                                          float y1,
                                          float x2,
                                          float y2)

  Add an annotation to the Checkbox or RadioButton.

  Parameters:
    `value` - the value of the annotation - this will be the value returned by `getValue()` if this annotation is selected. Note that "Off" is not allowed as an annotation name.
    `page` - the page to place the annotation on
    `x1` - the left-most X co-ordinate of the annotation
    `y1` - the top-most Y co-ordinate of the annotation
    `x2` - the right-most X co-ordinate of the annotation
    `y2` - the bottom-most Y co-ordinate of the annotation

### toString

    public String toString()

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