Package com.privatejgoodies.forms.util

Class DefaultUnitConverter

  • All Implemented Interfaces:
    ObservableBean, ObservableBean2, UnitConverter, java.io.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 Detail

      • PROPERTY_AVERAGE_CHARACTER_WIDTH_TEST_STRING

        public static final java.lang.String PROPERTY_AVERAGE_CHARACTER_WIDTH_TEST_STRING
        See Also:
        Constant Field Values

      • PROPERTY_DEFAULT_DIALOG_FONT

        public static final java.lang.String PROPERTY_DEFAULT_DIALOG_FONT
        See Also:
        Constant Field Values

      • OLD_AVERAGE_CHARACTER_TEST_STRING

        public static final java.lang.String OLD_AVERAGE_CHARACTER_TEST_STRING
        Since:
        1.6
        See Also:
        Constant Field Values

      • MODERN_AVERAGE_CHARACTER_TEST_STRING

        public static final java.lang.String MODERN_AVERAGE_CHARACTER_TEST_STRING
        Since:
        1.4
        See Also:
        Constant Field Values

      • BALANCED_AVERAGE_CHARACTER_TEST_STRING

        public static final java.lang.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 java.lang.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​(java.lang.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:
        java.lang.NullPointerException - if newTestString is null
        java.lang.IllegalArgumentException - if newTestString is empty or whitespace

      • getDefaultDialogFont

        public java.awt.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​(java.awt.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​(java.awt.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​(java.awt.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