PropertyEditorSupport (Java Platform SE 8 )
Keywords: java.beans.PropertyEditorSupport class
Date: 2015-05-24

java.beans

## Class PropertyEditorSupport

- java.lang.Object
- - java.beans.PropertyEditorSupport

- All Implemented Interfaces:
    PropertyEditor

      public class PropertyEditorSupport
      extends Object
      implements PropertyEditor

  This is a support class to help build property editors.

  It can be used either as a base class or as a delegate.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `PropertyEditorSupport()` Constructs a `PropertyEditorSupport` object.
    `PropertyEditorSupport(Object source)` Constructs a `PropertyEditorSupport` object.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addPropertyChangeListener(PropertyChangeListener listener)` Adds a listener for the value change.
    `void` | `firePropertyChange()` Report that we have been modified to any interested listeners.
    `String` | `getAsText()` Gets the property value as a string suitable for presentation to a human to edit.
    `Component` | `getCustomEditor()` A PropertyEditor may chose to make available a full custom Component that edits its property value.
    `String` | `getJavaInitializationString()` This method is intended for use when generating Java code to set the value of the property.
    `Object` | `getSource()` Returns the bean that is used as the source of events.
    `String[]` | `getTags()` If the property value must be one of a set of known tagged values, then this method should return an array of the tag values.
    `Object` | `getValue()` Gets the value of the property.
    `boolean` | `isPaintable()` Determines whether the class will honor the paintValue method.
    `void` | `paintValue(Graphics gfx, Rectangle box)` Paint a representation of the value into a given area of screen real estate.
    `void` | `removePropertyChangeListener(PropertyChangeListener listener)` Removes a listener for the value change.
    `void` | `setAsText(String text)` Sets the property value by parsing a given String.
    `void` | `setSource(Object source)` Sets the source bean.
    `void` | `setValue(Object value)` Set (or change) the object that is to be edited.
    `boolean` | `supportsCustomEditor()` Determines whether the propertyEditor can provide a custom editor.

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

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

- - ### Constructor Detail

    - #### PropertyEditorSupport

          public PropertyEditorSupport()

      Constructs a `PropertyEditorSupport` object.
      Since:
        1.5

    - #### PropertyEditorSupport

          public PropertyEditorSupport(Object source)

      Constructs a `PropertyEditorSupport` object.
      Parameters:
        `source` - the source used for event firing
      Since:
        1.5

  - ### Method Detail

    - #### getSource

          public Object getSource()

      Returns the bean that is used as the source of events. If the source has not been explicitly set then this instance of `PropertyEditorSupport` is returned.
      Returns:
        the source object or this instance
      Since:
        1.5

    - #### setSource

          public void setSource(Object source)

      Sets the source bean.

      The source bean is used as the source of events for the property changes. This source should be used for information purposes only and should not be modified by the PropertyEditor.

      Parameters:
        `source` - source object to be used for events
      Since:
        1.5

    - #### setValue

          public void setValue(Object value)

      Set (or change) the object that is to be edited.
      Specified by:
        `setValue` in interface `PropertyEditor`
      Parameters:
        `value` - The new target object to be edited. Note that this object should not be modified by the PropertyEditor, rather the PropertyEditor should create a new object to hold any modified value.

    - #### getValue

          public Object getValue()

      Gets the value of the property.
      Specified by:
        `getValue` in interface `PropertyEditor`
      Returns:
        The value of the property.

    - #### isPaintable

          public boolean isPaintable()

      Determines whether the class will honor the paintValue method.
      Specified by:
        `isPaintable` in interface `PropertyEditor`
      Returns:
        True if the class will honor the paintValue method.

    - #### paintValue

          public void paintValue(Graphics gfx,
                                 Rectangle box)

      Paint a representation of the value into a given area of screen real estate. Note that the propertyEditor is responsible for doing its own clipping so that it fits into the given rectangle.

      If the PropertyEditor doesn't honor paint requests (see isPaintable) this method should be a silent noop.

      Specified by:
        `paintValue` in interface `PropertyEditor`
      Parameters:
        `gfx` - Graphics object to paint into.
        `box` - Rectangle within graphics object into which we should paint.

    - #### getJavaInitializationString

          public String getJavaInitializationString()

      This method is intended for use when generating Java code to set the value of the property. It should return a fragment of Java code that can be used to initialize a variable with the current property value.

      Example results are "2", "new Color(127,127,34)", "Color.orange", etc.

      Specified by:
        `getJavaInitializationString` in interface `PropertyEditor`
      Returns:
        A fragment of Java code representing an initializer for the current value.

    - #### getAsText

          public String getAsText()

      Gets the property value as a string suitable for presentation to a human to edit.
      Specified by:
        `getAsText` in interface `PropertyEditor`
      Returns:
        The property value as a string suitable for presentation to a human to edit.

        Returns null if the value can't be expressed as a string.

        If a non-null value is returned, then the PropertyEditor should be prepared to parse that string back in setAsText().

    - #### setAsText

          public void setAsText(String text)
                         throws IllegalArgumentException

      Sets the property value by parsing a given String. May raise java.lang.IllegalArgumentException if either the String is badly formatted or if this kind of property can't be expressed as text.
      Specified by:
        `setAsText` in interface `PropertyEditor`
      Parameters:
        `text` - The string to be parsed.
      Throws:
        `IllegalArgumentException`

    - #### getTags

          public String[] getTags()

      If the property value must be one of a set of known tagged values, then this method should return an array of the tag values. This can be used to represent (for example) enum values. If a PropertyEditor supports tags, then it should support the use of setAsText with a tag value as a way of setting the value.
      Specified by:
        `getTags` in interface `PropertyEditor`
      Returns:
        The tag values for this property. May be null if this property cannot be represented as a tagged value.

    - #### getCustomEditor

          public Component getCustomEditor()

      A PropertyEditor may chose to make available a full custom Component that edits its property value. It is the responsibility of the PropertyEditor to hook itself up to its editor Component itself and to report property value changes by firing a PropertyChange event.

      The higher-level code that calls getCustomEditor may either embed the Component in some larger property sheet, or it may put it in its own individual dialog, or ...

      Specified by:
        `getCustomEditor` in interface `PropertyEditor`
      Returns:
        A java.awt.Component that will allow a human to directly edit the current property value. May be null if this is not supported.

    - #### supportsCustomEditor

          public boolean supportsCustomEditor()

      Determines whether the propertyEditor can provide a custom editor.
      Specified by:
        `supportsCustomEditor` in interface `PropertyEditor`
      Returns:
        True if the propertyEditor can provide a custom editor.

    - #### addPropertyChangeListener

          public void addPropertyChangeListener(PropertyChangeListener listener)

      Adds a listener for the value change. When the property editor changes its value it should fire a `PropertyChangeEvent` on all registered `PropertyChangeListener`s, specifying the `null` value for the property name. If the source property is set, it should be used as the source of the event.

      The same listener object may be added more than once, and will be called as many times as it is added. If `listener` is `null`, no exception is thrown and no action is taken.

      Specified by:
        `addPropertyChangeListener` in interface `PropertyEditor`
      Parameters:
        `listener` - the `PropertyChangeListener` to add

    - #### removePropertyChangeListener

          public void removePropertyChangeListener(PropertyChangeListener listener)

      Removes a listener for the value change.

      If the same listener was added more than once, it will be notified one less time after being removed. If `listener` is `null`, or was never added, no exception is thrown and no action is taken.

      Specified by:
        `removePropertyChangeListener` in interface `PropertyEditor`
      Parameters:
        `listener` - the `PropertyChangeListener` to remove

    - #### firePropertyChange

          public void firePropertyChange()

      Report that we have been modified to any interested listeners.

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