Module javafx.controls
Package javafx.scene.control

## Class TextFormatter<V>

- java.lang.Object
- - javafx.scene.control.TextFormatter<V>

- Type Parameters:
    `V` - The type of the value

      public class TextFormatter<V>
      extends Object

  A Formatter describes a format of a `TextInputControl` text by using two distinct mechanisms:
  - A filter (`getFilter()`) that can intercept and modify user input. This helps to keep the text in the desired format. A default text supplier can be used to provide the intial text.
  - A value converter (`getValueConverter()`) and value (`valueProperty()`) can be used to provide special format that represents a value of type `V`. If the control is editable and the text is changed by the user, the value is then updated to correspond to the text.

  It's possible to have a formatter with just filter or value converter. If value converter is not provided however, setting a value will result in an `IllegalStateException` and the value is always null.

  Since `Formatter` contains a value which represents the state of the `TextInputControl` to which it is currently assigned, a single `Formatter` instance can be used only in one `TextInputControl` at a time.

  Since:
    JavaFX 8u40

- - ### Property Summary

    Properties
    Type | Property | Description
    --- | --- | ---
    `ObjectProperty<V>` | `value` | The current value for this formatter.

  - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class | Description
    --- | --- | ---
    `static class` | `TextFormatter.Change` | Contains the state representing a change in the content or selection for a TextInputControl.

  - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `static StringConverter<String>` | `IDENTITY_STRING_CONVERTER` | This string converter converts the text to the same String value.

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `TextFormatter​(UnaryOperator<TextFormatter.Change> filter)` | Creates a new Formatter with the provided filter.
    `TextFormatter​(StringConverter<V> valueConverter)` | Creates a new Formatter with the provided value converter.
    `TextFormatter​(StringConverter<V> valueConverter, V defaultValue)` | Creates a new Formatter with the provided value converter and default value.
    `TextFormatter​(StringConverter<V> valueConverter, V defaultValue, UnaryOperator<TextFormatter.Change> filter)` | Creates a new Formatter with the provided filter, value converter and default value.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `UnaryOperator<TextFormatter.Change>` | `getFilter()` | Filter allows user to intercept and modify any change done to the text content.
    `V` | `getValue()` | Gets the value of the property value.
    `StringConverter<V>` | `getValueConverter()` | The converter between the values and text.
    `void` | `setValue​(V value)` | Sets the value of the property value.
    `ObjectProperty<V>` | `valueProperty()` | The current value for this formatter.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Property Detail

    - #### value

          public final ObjectProperty<V> valueProperty

      The current value for this formatter. When the formatter is set on a `TextInputControl` and has a `valueConverter`, the value is set by the control, when the text is commited.
      See Also:
        `getValue()`, `setValue(V)`

  - ### Field Detail

    - #### IDENTITY_STRING_CONVERTER

          public static final StringConverter<String> IDENTITY_STRING_CONVERTER

      This string converter converts the text to the same String value. This might be useful for cases where you want to manipulate with the text through the value or you need to provide a default text value.

  - ### Constructor Detail

    - #### TextFormatter

          public TextFormatter​(UnaryOperator<TextFormatter.Change> filter)

      Creates a new Formatter with the provided filter.
      Parameters:
        `filter` - The filter to use in this formatter or null

    - #### TextFormatter

          public TextFormatter​(StringConverter<V> valueConverter,
                               V defaultValue,
                               UnaryOperator<TextFormatter.Change> filter)

      Creates a new Formatter with the provided filter, value converter and default value.
      Parameters:
        `valueConverter` - The value converter to use in this formatter or null.
        `defaultValue` - the default value.
        `filter` - The filter to use in this formatter or null

    - #### TextFormatter

          public TextFormatter​(StringConverter<V> valueConverter,
                               V defaultValue)

      Creates a new Formatter with the provided value converter and default value.
      Parameters:
        `valueConverter` - The value converter to use in this formatter. This must not be null.
        `defaultValue` - the default value

    - #### TextFormatter

          public TextFormatter​(StringConverter<V> valueConverter)

      Creates a new Formatter with the provided value converter. The default value will be null.
      Parameters:
        `valueConverter` - The value converter to use in this formatter. This must not be null.

  - ### Method Detail

    - #### getValueConverter

          public final StringConverter<V> getValueConverter()

      The converter between the values and text. It maintains a "binding" between the `TextInputControl.textProperty()` } and `valueProperty()` }. The value is updated when the control loses it's focus or it is commited (TextField only). Setting the value will update the text of the control, usin the provided converter. If it's impossible to convert text to value, an exception should be thrown.
      Returns:
        StringConverter for values or null if none provided
      See Also:
        `TextInputControl.commitValue()`, `TextInputControl.cancelEdit()`

    - #### getFilter

          public final UnaryOperator<TextFormatter.Change> getFilter()

      Filter allows user to intercept and modify any change done to the text content.

      The filter itself is an `UnaryOperator` that accepts `TextFormatter.Change` object. It should return a `TextFormatter.Change` object that contains the actual (filtered) change. Returning null rejects the change.

      Returns:
        the filter for this formatter or null if there is none

    - #### valueProperty

          public final ObjectProperty<V> valueProperty()

      The current value for this formatter. When the formatter is set on a `TextInputControl` and has a `valueConverter`, the value is set by the control, when the text is commited.
      See Also:
        `getValue()`, `setValue(V)`

    - #### setValue

          public final void setValue​(V value)

      Sets the value of the property value.
      Property description:
        The current value for this formatter. When the formatter is set on a `TextInputControl` and has a `valueConverter`, the value is set by the control, when the text is commited.

    - #### getValue

          public final V getValue()

      Gets the value of the property value.
      Property description:
        The current value for this formatter. When the formatter is set on a `TextInputControl` and has a `valueConverter`, the value is set by the control, when the text is commited.