com.jgoodies.forms.util

## Class DefaultUnitConverter

- java.lang.Object
- - com.jgoodies.common.bean.Bean
  - - com.jgoodies.forms.util.AbstractUnitConverter
    - - com.jgoodies.forms.util.DefaultUnitConverter

- All Implemented Interfaces:
    com.jgoodies.common.bean.ObservableBean, com.jgoodies.common.bean.ObservableBean2, UnitConverter, Serializable

      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: 1.23 $
  Author:
    Karsten Lentzsch
  See Also:
    `UnitConverter`, `Size`, `Sizes`, Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `BALANCED_AVERAGE_CHARACTER_TEST_STRING`
    `static String` | `MODERN_AVERAGE_CHARACTER_TEST_STRING`
    `static String` | `OLD_AVERAGE_CHARACTER_TEST_STRING`
    `static String` | `PROPERTY_AVERAGE_CHARACTER_WIDTH_TEST_STRING`
    `static String` | `PROPERTY_DEFAULT_DIALOG_FONT`

    - ### Fields inherited from class com.jgoodies.common.bean.Bean

      `changeSupport`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `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` | `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 com.jgoodies.common.bean.Bean

      `addPropertyChangeListener, addPropertyChangeListener, addVetoableChangeListener, addVetoableChangeListener, createPropertyChangeSupport, fireIndexedPropertyChange, fireIndexedPropertyChange, fireIndexedPropertyChange, fireMultiplePropertiesChanged, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, fireVetoableChange, fireVetoableChange, fireVetoableChange, fireVetoableChange, fireVetoableChange, fireVetoableChange, getPropertyChangeListeners, getPropertyChangeListeners, getVetoableChangeListeners, getVetoableChangeListeners, removePropertyChangeListener, removePropertyChangeListener, removeVetoableChangeListener, removeVetoableChangeListener`

    - ### 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

    - #### OLD_AVERAGE_CHARACTER_TEST_STRING

          public static final String OLD_AVERAGE_CHARACTER_TEST_STRING

      Since:
        1.6
      See Also:
        Constant Field Values

    - #### MODERN_AVERAGE_CHARACTER_TEST_STRING

          public static final String MODERN_AVERAGE_CHARACTER_TEST_STRING

      Since:
        1.4
      See Also:
        Constant Field Values

    - #### BALANCED_AVERAGE_CHARACTER_TEST_STRING

          public static final String BALANCED_AVERAGE_CHARACTER_TEST_STRING

      Since:
        1.4
      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 `BALANCED_AVERAGE_CHARACTER_TEST_STRING`.
      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 `BALANCED_AVERAGE_CHARACTER_TEST_STRING`. You can provide other test strings, for example:
      - "Xximeee"
      - "ABCEDEFHIJKLMNOPQRSTUVWXYZ"
      - "abcdefghijklmnopqrstuvwxyz"
      Parameters:
        `newTestString` - the test string to be used
      Throws:
        `NullPointerException` - if `newTestString` is `null`
        `IllegalArgumentException` - if `newTestString` is empty or whitespace

    - #### 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

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