Java java.awt Enum Component.BaselineResizeBehavior（JDK8）

Enum Constant Detail

• CONSTANT_ASCENT

  public static final Component.BaselineResizeBehavior CONSTANT_ASCENT

  Indicates the baseline remains fixed relative to the y-origin. That is, getBaseline returns the same value regardless of the height or width. For example, a JLabel containing non-empty text with a vertical alignment of TOP should have a baseline type of CONSTANT_ASCENT.

• CONSTANT_DESCENT

  public static final Component.BaselineResizeBehavior CONSTANT_DESCENT

  Indicates the baseline remains fixed relative to the height and does not change as the width is varied. That is, for any height H the difference between H and getBaseline(w, H) is the same. For example, a JLabel containing non-empty text with a vertical alignment of BOTTOM should have a baseline type of CONSTANT_DESCENT.

• CENTER_OFFSET

  public static final Component.BaselineResizeBehavior CENTER_OFFSET

  Indicates the baseline remains a fixed distance from the center of the component. That is, for any height H the difference between getBaseline(w, H) and H / 2 is the same (plus or minus one depending upon rounding error).

  Because of possible rounding errors it is recommended you ask for the baseline with two consecutive heights and use the return value to determine if you need to pad calculations by 1. The following shows how to calculate the baseline for any height:

     Dimension preferredSize = component.getPreferredSize();
     int baseline = getBaseline(preferredSize.width,
                                preferredSize.height);
     int nextBaseline = getBaseline(preferredSize.width,
                                    preferredSize.height + 1);
     // Amount to add to height when calculating where baseline
     // lands for a particular height:
     int padding = 0;
     // Where the baseline is relative to the mid point
     int baselineOffset = baseline - height / 2;
     if (preferredSize.height % 2 == 0 &&
         baseline != nextBaseline) {
         padding = 1;
     }
     else if (preferredSize.height % 2 == 1 &&
              baseline == nextBaseline) {
         baselineOffset--;
         padding = 1;
     }
     // The following calculates where the baseline lands for
     // the height z:
     int calculatedBaseline = (z + padding) / 2 + baselineOffset;
   

• OTHER

  public static final Component.BaselineResizeBehavior OTHER

  Indicates the baseline resize behavior can not be expressed using any of the other constants. This may also indicate the baseline varies with the width of the component. This is also returned by components that do not have a baseline.

Method Detail

• values

  public static Component.BaselineResizeBehavior[] values()

  Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

  for (Component.BaselineResizeBehavior c : Component.BaselineResizeBehavior.values())
      System.out.println(c);
  

  Returns:

  an array containing the constants of this enum type, in the order they are declared

• valueOf

  public static Component.BaselineResizeBehavior valueOf(String name)

  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

  Parameters:

  name - the name of the enum constant to be returned.

  Returns:

  the enum constant with the specified name

  Throws:

  IllegalArgumentException - if this enum type has no constant with the specified name

  NullPointerException - if the argument is null