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## com.jgoodies.forms.util
Class DefaultUnitConverter

    java.lang.Object
      com.jgoodies.forms.util.AbstractUnitConverter
          com.jgoodies.forms.util.DefaultUnitConverter

All Implemented Interfaces:
  UnitConverter

    public final class DefaultUnitConverter

extends AbstractUnitConverter

This is the default implementation of the `UnitConverter` interface. It converts horizontal and vertical dialog base units to pixels.

The horizontal base unit is equal to the average width, in pixels, of the characters in the system font; the vertical base unit is equal to the height, in pixels, of the font. Each horizontal base unit is equal to 4 horizontal dialog units; each vertical base unit is equal to 8 vertical dialog units.

The DefaultUnitConverter computes dialog base units using a default font and a test string for the average character width. You can configure the font and the test string via the bound Bean properties defaultDialogFont and averageCharacterWidthTestString. See also Microsoft's suggestion for a custom computation custom computation. More information how to use dialog units in screen design can be found in Microsoft's Design Specifications and Guidelines.

Since the Forms 1.1 this converter logs font information at the `CONFIG` level.

Version:
  $Revision: 1.17 $
Author:
  Karsten Lentzsch
See Also:
  `UnitConverter`, `Size`, `Sizes`

Field Summary
`static String` | `PROPERTY_AVERAGE_CHARACTER_WIDTH_TEST_STRING`
`static String` | `PROPERTY_DEFAULT_DIALOG_FONT`

Method Summary
`void` | `addPropertyChangeListener(PropertyChangeListener listener)` Adds a PropertyChangeListener to the listener list.
`void` | `addPropertyChangeListener(String propertyName, PropertyChangeListener listener)` Adds a PropertyChangeListener to the listener list for a specific property.
`String` | `getAverageCharacterWidthTestString()` Returns the string used to compute the average character width.
`Font` | `getDefaultDialogFont()` Returns the dialog font that is used to compute the dialog base units.
`protected double` | `getDialogBaseUnitsX(Component component)` Returns the cached or computed horizontal dialog base units.
`protected double` | `getDialogBaseUnitsY(Component component)` Returns the cached or computed vertical dialog base units for the given component.
`static DefaultUnitConverter` | `getInstance()` Lazily instantiates and returns the sole instance.
`void` | `removePropertyChangeListener(PropertyChangeListener listener)` Removes a PropertyChangeListener from the listener list.
`void` | `removePropertyChangeListener(String propertyName, PropertyChangeListener listener)` Removes a PropertyChangeListener from the listener list for a specific property.
`void` | `setAverageCharacterWidthTestString(String newTestString)` Sets a string that will be used to compute the average character width.
`void` | `setDefaultDialogFont(Font newFont)` Sets a dialog font that will be used to compute the dialog base units.

Methods inherited from class com.jgoodies.forms.util.AbstractUnitConverter
`centimeterAsPixel, centimeterAsPixel, computeAverageCharWidth, dialogUnitXAsPixel, dialogUnitXAsPixel, dialogUnitYAsPixel, dialogUnitYAsPixel, getDefaultScreenResolution, getScreenResolution, inchAsPixel, inchAsPixel, millimeterAsPixel, millimeterAsPixel, pointAsPixel, pointAsPixel`

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

Field Detail

### PROPERTY_AVERAGE_CHARACTER_WIDTH_TEST_STRING

    public static final String PROPERTY_AVERAGE_CHARACTER_WIDTH_TEST_STRING

See Also:
  Constant Field Values

### PROPERTY_DEFAULT_DIALOG_FONT

    public static final String PROPERTY_DEFAULT_DIALOG_FONT

See Also:
  Constant Field Values

Method Detail

### getInstance

    public static DefaultUnitConverter getInstance()

  Lazily instantiates and returns the sole instance.

  Returns:
    the lazily instantiated sole instance

### getAverageCharacterWidthTestString

    public String getAverageCharacterWidthTestString()

  Returns the string used to compute the average character width. By default it is initialized to "X".

  Returns:
    the test string used to compute the average character width

### setAverageCharacterWidthTestString

    public void setAverageCharacterWidthTestString(String newTestString)

  Sets a string that will be used to compute the average character width. By default it is initialized to "X". You can provide other test strings, for example:
  - "Xximeee"
  - "ABCEDEFHIJKLMNOPQRSTUVWXYZ"
  - "abcdefghijklmnopqrstuvwxyz"

  Parameters:
    `newTestString` - the test string to be used
  Throws:
    `IllegalArgumentException` - if the test string is empty
    `NullPointerException` - if the test string is `null`

### getDefaultDialogFont

    public Font getDefaultDialogFont()

  Returns the dialog font that is used to compute the dialog base units. If a default dialog font has been set using `setDefaultDialogFont(Font)`, this font will be returned. Otherwise a cached fallback will be lazily created.

  Returns:
    the font used to compute the dialog base units

### setDefaultDialogFont

    public void setDefaultDialogFont(Font newFont)

  Sets a dialog font that will be used to compute the dialog base units.

  Parameters:
    `newFont` - the default dialog font to be set

### getDialogBaseUnitsX

    protected double getDialogBaseUnitsX(Component component)

  Returns the cached or computed horizontal dialog base units.

  Specified by:
    `getDialogBaseUnitsX` in class `AbstractUnitConverter`
  Parameters:
    `component` - a Component that provides the font and graphics
  Returns:
    the horizontal dialog base units

### getDialogBaseUnitsY

    protected double getDialogBaseUnitsY(Component component)

  Returns the cached or computed vertical dialog base units for the given component.

  Specified by:
    `getDialogBaseUnitsY` in class `AbstractUnitConverter`
  Parameters:
    `component` - a Component that provides the font and graphics
  Returns:
    the vertical dialog base units

### addPropertyChangeListener

    public void addPropertyChangeListener(PropertyChangeListener listener)

  Adds a PropertyChangeListener to the listener list. The listener is registered for all bound properties of this class.

  If listener is null, no exception is thrown and no action is performed.

  Parameters:
    `listener` - the PropertyChangeListener to be added
  See Also:
    `removePropertyChangeListener(PropertyChangeListener)`, `removePropertyChangeListener(String, PropertyChangeListener)`, `addPropertyChangeListener(String, PropertyChangeListener)`

### removePropertyChangeListener

    public void removePropertyChangeListener(PropertyChangeListener listener)

  Removes a PropertyChangeListener from the listener list. This method should be used to remove PropertyChangeListeners that were registered for all bound properties of this class.

  If listener is null, no exception is thrown and no action is performed.

  Parameters:
    `listener` - the PropertyChangeListener to be removed
  See Also:
    `addPropertyChangeListener(PropertyChangeListener)`, `addPropertyChangeListener(String, PropertyChangeListener)`, `removePropertyChangeListener(String, PropertyChangeListener)`

### addPropertyChangeListener

    public void addPropertyChangeListener(String propertyName,
                                          PropertyChangeListener listener)

  Adds a PropertyChangeListener to the listener list for a specific property. The specified property may be user-defined.

  Note that if this Model is inheriting a bound property, then no event will be fired in response to a change in the inherited property.

  If listener is null, no exception is thrown and no action is performed.

  Parameters:
    `propertyName` - one of the property names listed above
    `listener` - the PropertyChangeListener to be added
  See Also:
    `removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`, `addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`

### removePropertyChangeListener

    public void removePropertyChangeListener(String propertyName,
                                             PropertyChangeListener listener)

  Removes a PropertyChangeListener from the listener list for a specific property. This method should be used to remove PropertyChangeListeners that were registered for a specific bound property.

  If listener is null, no exception is thrown and no action is performed.

  Parameters:
    `propertyName` - a valid property name
    `listener` - the PropertyChangeListener to be removed
  See Also:
    `addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)`, `removePropertyChangeListener(java.beans.PropertyChangeListener)`

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Copyright © 2002-2009 JGoodies Karsten Lentzsch. All Rights Reserved.