- java.lang.Object
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- java.lang.Enum<Component.BaselineResizeBehavior>
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- java.awt.Component.BaselineResizeBehavior
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- All Implemented Interfaces:
- Serializable, Comparable<Component.BaselineResizeBehavior>
- Enclosing class:
- Component
public static enum Component.BaselineResizeBehavior extends Enum<Component.BaselineResizeBehavior>
Enumeration of the common ways the baseline of a component can change as the size changes. The baseline resize behavior is primarily for layout managers that need to know how the position of the baseline changes as the component size changes. In general the baseline resize behavior will be valid for sizes greater than or equal to the minimum size (the actual minimum size; not a developer specified minimum size). For sizes smaller than the minimum size the baseline may change in a way other than the baseline resize behavior indicates. Similarly, as the size approachesInteger.MAX_VALUE
and/orShort.MAX_VALUE
the baseline may change in a way other than the baseline resize behavior indicates.- Since:
- 1.6
- See Also:
Component.getBaselineResizeBehavior()
,Component.getBaseline(int,int)
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Enum Constant Summary
Enum Constants Enum Constant and Description CENTER_OFFSET
Indicates the baseline remains a fixed distance from the center of the component.CONSTANT_ASCENT
Indicates the baseline remains fixed relative to the y-origin.CONSTANT_DESCENT
Indicates the baseline remains fixed relative to the height and does not change as the width is varied.OTHER
Indicates the baseline resize behavior can not be expressed using any of the other constants.
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Method Summary
Methods Modifier and Type Method and Description static Component.BaselineResizeBehavior
valueOf(String name)
Returns the enum constant of this type with the specified name.static Component.BaselineResizeBehavior[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.
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Enum Constant Detail
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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, aJLabel
containing non-empty text with a vertical alignment ofTOP
should have a baseline type ofCONSTANT_ASCENT
.
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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 andgetBaseline(w, H)
is the same. For example, aJLabel
containing non-empty text with a vertical alignment ofBOTTOM
should have a baseline type ofCONSTANT_DESCENT
.
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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 betweengetBaseline(w, H)
andH / 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;
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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.
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Method Detail
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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
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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 nameNullPointerException
- if the argument is null
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