Class TextHitInfo
- java.lang.Object
-
- java.awt.font.TextHitInfo
public final class TextHitInfo extends Object
The TextHitInfo
class represents a character position in a text model, and a bias, or "side," of the character. Biases are either leading (the left edge, for a left-to-right character) or trailing (the right edge, for a left-to-right character). Instances of TextHitInfo
are used to specify caret and insertion positions within text.
For example, consider the text "abc". TextHitInfo.trailing(1) corresponds to the right side of the 'b' in the text.
TextHitInfo
is used primarily by TextLayout
and clients of TextLayout
. Clients of TextLayout
query TextHitInfo
instances for an insertion offset, where new text is inserted into the text model. The insertion offset is equal to the character position in the TextHitInfo
if the bias is leading, and one character after if the bias is trailing. The insertion offset for TextHitInfo.trailing(1) is 2.
Sometimes it is convenient to construct a TextHitInfo
with the same insertion offset as an existing one, but on the opposite character. The getOtherHit
method constructs a new TextHitInfo
with the same insertion offset as an existing one, with a hit on the character on the other side of the insertion offset. Calling getOtherHit
on trailing(1) would return leading(2). In general, getOtherHit
for trailing(n) returns leading(n+1) and getOtherHit
for leading(n) returns trailing(n-1).
Example:
Converting a graphical point to an insertion point within a text model
TextLayout layout = ...; Point2D.Float hitPoint = ...; TextHitInfo hitInfo = layout.hitTestChar(hitPoint.x, hitPoint.y); int insPoint = hitInfo.getInsertionIndex(); // insPoint is relative to layout; may need to adjust for use // in a text model
- See Also:
TextLayout
Methods
Modifier and Type | Method | Description |
---|---|---|
static TextHitInfo | afterOffset(int offset) | Creates a |
static TextHitInfo | beforeOffset(int offset) | Creates a |
boolean | equals(TextHitInfo hitInfo) | Returns |
boolean | equals(Object obj) | Returns |
int | getCharIndex() | Returns the index of the character hit. |
int | getInsertionIndex() | Returns the insertion index. |
TextHitInfo | getOffsetHit(int delta) | Creates a |
TextHitInfo | getOtherHit() | Creates a |
int | hashCode() | Returns the hash code. |
boolean | isLeadingEdge() | Returns |
static TextHitInfo | leading(int charIndex) | Creates a |
String | toString() | Returns a |
static TextHitInfo | trailing(int charIndex) | Creates a hit on the trailing edge of the character at the specified |
Methods declared in class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
Methods
getCharIndex
public int getCharIndex()
Returns the index of the character hit.
- Returns:
- the index of the character hit.
isLeadingEdge
public boolean isLeadingEdge()
Returns true
if the leading edge of the character was hit.
- Returns:
-
true
if the leading edge of the character was hit;false
otherwise.
getInsertionIndex
public int getInsertionIndex()
Returns the insertion index. This is the character index if the leading edge of the character was hit, and one greater than the character index if the trailing edge was hit.
- Returns:
- the insertion index.
hashCode
public int hashCode()
Returns the hash code.
- Overrides:
-
hashCode
in classObject
- Returns:
- the hash code of this
TextHitInfo
, which is also thecharIndex
of thisTextHitInfo
. - See Also:
-
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)
equals
public boolean equals(Object obj)
Returns true
if the specified Object
is a TextHitInfo
and equals this TextHitInfo
.
- Overrides:
-
equals
in classObject
- Parameters:
-
obj
- theObject
to test for equality - Returns:
-
true
if the specifiedObject
equals thisTextHitInfo
;false
otherwise. - See Also:
-
Object.hashCode()
,HashMap
equals
public boolean equals(TextHitInfo hitInfo)
Returns true
if the specified TextHitInfo
has the same charIndex
and isLeadingEdge
as this TextHitInfo
. This is not the same as having the same insertion offset.
- Parameters:
-
hitInfo
- a specifiedTextHitInfo
- Returns:
-
true
if the specifiedTextHitInfo
has the samecharIndex
andisLeadingEdge
as thisTextHitInfo
.
toString
public String toString()
Returns a String
representing the hit for debugging use only.
leading
public static TextHitInfo leading(int charIndex)
Creates a TextHitInfo
on the leading edge of the character at the specified charIndex
.
- Parameters:
-
charIndex
- the index of the character hit - Returns:
- a
TextHitInfo
on the leading edge of the character at the specifiedcharIndex
.
trailing
public static TextHitInfo trailing(int charIndex)
Creates a hit on the trailing edge of the character at the specified charIndex
.
- Parameters:
-
charIndex
- the index of the character hit - Returns:
- a
TextHitInfo
on the trailing edge of the character at the specifiedcharIndex
.
beforeOffset
public static TextHitInfo beforeOffset(int offset)
Creates a TextHitInfo
at the specified offset, associated with the character before the offset.
- Parameters:
-
offset
- an offset associated with the character before the offset - Returns:
- a
TextHitInfo
at the specified offset.
afterOffset
public static TextHitInfo afterOffset(int offset)
Creates a TextHitInfo
at the specified offset, associated with the character after the offset.
- Parameters:
-
offset
- an offset associated with the character after the offset - Returns:
- a
TextHitInfo
at the specified offset.
getOtherHit
public TextHitInfo getOtherHit()
Creates a TextHitInfo
on the other side of the insertion point. This TextHitInfo
remains unchanged.
- Returns:
- a
TextHitInfo
on the other side of the insertion point.
getOffsetHit
public TextHitInfo getOffsetHit(int delta)
Creates a TextHitInfo
whose character index is offset by delta
from the charIndex
of this TextHitInfo
. This TextHitInfo
remains unchanged.
- Parameters:
-
delta
- the value to offset thischarIndex
- Returns:
- a
TextHitInfo
whosecharIndex
is offset bydelta
from thecharIndex
of thisTextHitInfo
.
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/java/awt/font/TextHitInfo.html