-
- All Implemented Interfaces:
- java.io.Serializable, java.lang.Comparable<Component.BaselineResizeBehavior>
- Enclosing class:
- Component
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 approaches Integer.MAX_VALUE
and/or
Short.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)
-
-
|
Enum Constant and Description |
|
CENTER_OFFSET |
CENTER_OFFSET
Indicates the baseline remains a fixed distance from
the center of the component.
-
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;
|
|
CONSTANT_ASCENT |
CONSTANT_ASCENT
Indicates the baseline remains fixed relative to the
y-origin.
-
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 |
CONSTANT_DESCENT
Indicates the baseline remains fixed relative to the height
and does not change as the width is varied.
-
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 .
|
|
OTHER |
OTHER
Indicates the baseline resize behavior can not be expressed using
any of the other constants.
-
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.
|
-
|
Modifier and Type |
Static Method and Description |
|
valueOf |
Returns the enum constant of this type with the specified 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:
java.lang.IllegalArgumentException - if this enum type has no constant
with the specified name
java.lang.NullPointerException - if the argument is null
|
|
values |
Returns an array containing the constants of this enum type, in
the order they are declared.
-
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
|
-
-
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString
-
getClass, notify, notifyAll, wait, wait, wait
This document was created by
Dulcet from the OpenJDK sources.
Copyright © 1993, 2012 Oracle and/or its affiliates. All rights reserved.