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Rich-text area for JavaFX
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package org.fxmisc.richtext;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Bounds;
import javafx.util.Duration;
import org.reactfx.value.Var;
import java.text.BreakIterator;
import java.util.Optional;
import java.util.OptionalInt;
/**
* An object for encapsulating a caret in a given area.
*
*
* "Position" refers to the place in-between characters. In other words, every {@code "|"} in
* {@code "|t|e|x|t|"} is a valid position. There are two kinds of positions used here:
*
* -
* {@link #getPosition()}, which refers to a position somewhere in the entire area's content.
* It's bounds are {@code 0 <= x <= area.getLength()}.
*
* -
* {@link #getColumnPosition()}, which refers to a position somewhere in the current paragraph.
* It's bounds are {@code 0 <= x <= area.getParagraphLength(index)}.
*
*
*
* Note: when parameter names are "position" without the "column" prefix, they refer to the position in the entire area.
*
*
* "Line" refers either to a single paragraph when {@link GenericStyledArea#isWrapText() the area does not wrap
* its text} or to a line on a multi-line paragraph when the area does wrap its text.
*
*/
public interface Caret {
/**
* Determines whether the caret is visible. Those who wish to use the default configuration should use
* {@link #AUTO} while those who want a more custom configuration should make a caret's {@code CaretVisibility}
* value oscillate between {@link #ON} and {@link #OFF}.
*/
public static enum CaretVisibility {
/** Caret is displayed. */
ON,
/** Caret is displayed when area is focused, enabled, and editable. */
AUTO,
/** Caret is not displayed. */
OFF
}
/* ********************************************************************** *
* *
* Observables *
* *
* Observables are "dynamic" (i.e. changing) characteristics of this *
* control. They are not directly settable by the client code, but change *
* in response to user input and/or API actions. *
* *
* ********************************************************************** */
/** The position of the caret within the text */
public ObservableValue positionProperty();
public int getPosition();
/** The paragraph index that contains this caret */
public ObservableValue paragraphIndexProperty();
public int getParagraphIndex();
/** The line index of a multi-line paragraph that contains this caret */
public ObservableValue lineIndexProperty();
public OptionalInt getLineIndex();
/** The column position of the caret on its given line */
public ObservableValue columnPositionProperty();
public int getColumnPosition();
/**
* Whether to display the caret or not. Default value is
* {@link CaretVisibility#AUTO}.
*/
public Var showCaretProperty();
public CaretVisibility getShowCaret();
public void setShowCaret(CaretVisibility value);
/** Whether the caret is being shown in the viewport */
public ObservableValue visibleProperty();
public boolean isVisible();
public ObservableValue blinkRateProperty();
public Duration getBlinkRate();
public void setBlinkRate(Duration blinkRate);
/**
* The selectionBoundsProperty of the caret in the Screen's coordinate system or {@link Optional#empty()} if caret is not visible
* in the viewport.
*/
public ObservableValue> caretBoundsProperty();
public Optional getCaretBounds();
/**
* Clears the caret's x offset
*/
void clearTargetOffset();
/**
* Stores the caret's current column position, so that moving the caret vertically will keep it close to its
* original offset in a line.
*/
ParagraphBox.CaretOffsetX getTargetOffset();
boolean isBeingUpdated();
ObservableValue beingUpdatedProperty();
/* ********************************************************************** *
* *
* Actions *
* *
* Actions change the state of this control. They typically cause a *
* change of one or more observables and/or produce an event. *
* *
* ********************************************************************** */
/**
* Moves the caret to the given position in the area. If this caret is bound to a {@link CaretSelectionBind},
* it displaces the caret from the selection by positioning only the caret to the new location without
* also affecting the {@link CaretSelectionBind#getAnchorPosition()} bounded selection's anchor} or the
* {@link CaretSelectionBind#getRange()} selection}.
*
* This method can be used to achieve the special case of positioning the caret outside or inside the selection,
* as opposed to always being at the boundary. Use with care.
*
* Caution: see {@link TextEditingArea#getAbsolutePosition(int, int)} to
* know how the column index argument can affect the returned position.
*/
public void moveTo(int paragraphIndex, int columnPosition);
/**
* Moves the caret to the given position in the area. If this caret is bound to a {@link CaretSelectionBind},
* it displaces the caret from the selection by positioning only the caret to the new location without
* also affecting the {@link CaretSelectionBind#getAnchorPosition()} bounded selection's anchor} or the
* {@link CaretSelectionBind#getRange()} selection}.
*
* This method can be used to achieve the special case of positioning the caret outside or inside the selection,
* as opposed to always being at the boundary. Use with care.
*/
public void moveTo(int position);
/**
* Moves the caret to the beginning of the current paragraph.
*/
void moveToParStart();
/**
* Moves the caret to the end of the current paragraph.
*/
void moveToParEnd();
/**
* Moves the caret to the beginning of the area.
*/
default void moveToAreaStart() {
moveTo(0);
}
/**
* Moves the caret to the end of the area.
*/
void moveToAreaEnd();
/**
* Moves the caret backward one char in the text.
*/
void moveToPrevChar();
/**
* Moves the caret forward one char in the text.
*/
void moveToNextChar();
/**
* Moves the caret forwards by the number of breaks.
*/
void moveBreaksForwards(int numOfBreaks, BreakIterator breakIterator);
default void moveWordBreaksForwards(int numOfWordBreaks) {
moveBreaksForwards(numOfWordBreaks, BreakIterator.getWordInstance( getArea().getLocale() ));
}
default void moveSentenceBreaksForwards(int numOfSentenceBreaks) {
moveBreaksForwards(numOfSentenceBreaks, BreakIterator.getSentenceInstance( getArea().getLocale() ));
}
/**
* Moves the caret backwards by the number of breaks.
*/
void moveBreaksBackwards(int numOfBreaks, BreakIterator breakIterator);
default void moveWordBreaksBackwards(int numOfWordBreaks) {
moveBreaksBackwards(numOfWordBreaks, BreakIterator.getWordInstance( getArea().getLocale() ));
}
default void moveSentenceBreaksBackwards(int numOfSentenceBreaks) {
moveBreaksBackwards(numOfSentenceBreaks, BreakIterator.getSentenceInstance( getArea().getLocale() ));
}
/**
* Disposes the caret and prevents memory leaks
*/
public void dispose();
/**
* Gets the area with which this caret is associated.
*/
public GenericStyledArea getArea();
/**
* Gets the name of this caret. Each caret that is added to an area must have a unique name since it is used
* to distinguish it from others in a Set.
*/
public String getCaretName();
}