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Rich-text area for JavaFX
package org.fxmisc.richtext;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Bounds;
import javafx.scene.control.IndexRange;
import org.fxmisc.richtext.model.PlainTextChange;
import org.fxmisc.richtext.model.StyledDocument;
import org.fxmisc.richtext.model.TwoDimensional.Position;
import org.reactfx.EventStream;
import org.reactfx.EventStreams;
import org.reactfx.Subscription;
import org.reactfx.Suspendable;
import org.reactfx.SuspendableNo;
import org.reactfx.value.SuspendableVal;
import org.reactfx.value.Val;
import org.reactfx.value.Var;
import java.text.BreakIterator;
import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.IntSupplier;
import static org.fxmisc.richtext.model.TwoDimensional.Bias.Backward;
import static org.fxmisc.richtext.model.TwoDimensional.Bias.Forward;
import static org.reactfx.EventStreams.invalidationsOf;
import static org.reactfx.EventStreams.merge;
/**
* Default implementation for {@link Selection}.
*/
public class SelectionImpl implements Selection, Comparable> {
/* ********************************************************************** *
* *
* 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. *
* *
* ********************************************************************** */
private final SuspendableVal range;
@Override public final IndexRange getRange() { return range.getValue(); }
@Override public final ObservableValue rangeProperty() { return range; }
private final SuspendableVal length;
@Override public final int getLength() { return length.getValue(); }
@Override public final ObservableValue lengthProperty() { return length; }
private final Val paragraphSpan;
@Override public final int getParagraphSpan() { return paragraphSpan.getValue(); }
@Override public final ObservableValue paragraphSpanProperty() { return paragraphSpan; }
private final SuspendableVal> selectedDocument;
@Override public final ObservableValue> selectedDocumentProperty() { return selectedDocument; }
@Override public final StyledDocument getSelectedDocument() { return selectedDocument.getValue(); }
private final SuspendableVal selectedText;
@Override public final String getSelectedText() { return selectedText.getValue(); }
@Override public final ObservableValue selectedTextProperty() { return selectedText; }
private final SuspendableVal startPosition;
@Override public final int getStartPosition() { return startPosition.getValue(); }
@Override public final ObservableValue startPositionProperty() { return startPosition; }
private final Val startParagraphIndex;
@Override public final int getStartParagraphIndex() { return startParagraphIndex.getValue(); }
@Override public final ObservableValue startParagraphIndexProperty() { return startParagraphIndex; }
private final Val startColumnPosition;
@Override public final int getStartColumnPosition() { return startColumnPosition.getValue(); }
@Override public final ObservableValue startColumnPositionProperty() { return startColumnPosition; }
private final SuspendableVal endPosition;
@Override public final int getEndPosition() { return endPosition.getValue(); }
@Override public final ObservableValue endPositionProperty() { return endPosition; }
private final Val endParagraphIndex;
@Override public final int getEndParagraphIndex() { return endParagraphIndex.getValue(); }
@Override public final ObservableValue endParagraphIndexProperty() { return endParagraphIndex; }
private final Val endColumnPosition;
@Override public final int getEndColumnPosition() { return endColumnPosition.getValue(); }
@Override public final ObservableValue endColumnPositionProperty() { return endColumnPosition; }
private final SuspendableVal> bounds;
@Override public final Optional getSelectionBounds() { return bounds.getValue(); }
@Override public final ObservableValue> selectionBoundsProperty() { return bounds; }
private final SuspendableNo beingUpdated = new SuspendableNo();
@Override public final boolean isBeingUpdated() { return beingUpdated.get(); }
@Override public final ObservableValue beingUpdatedProperty() { return beingUpdated; }
private final GenericStyledArea area;
@Override public GenericStyledArea getArea() { return area; }
private final String name;
@Override public String getSelectionName() { return name; }
private final SuspendableNo dependentBeingUpdated;
private final Var internalRange;
private final EventStream dirty;
private final Var start2DPosition;
private final Val end2DPosition;
private final Consumer configurePath;
private Subscription subscription = () -> {};
/**
* Creates a selection with both the start and end position at 0.
* @param name must be unique and is also used as a StyleClass for
* configuration via CSS using selectors from Path, Shape, and Node.
*/
public SelectionImpl(String name, GenericStyledArea area) {
this(name, area, 0, 0);
}
/**
* Creates a selection with customized configuration via {@code configurePath}
* with both the start and end position at 0.
*/
public SelectionImpl(String name, GenericStyledArea area, Consumer configurePath) {
this(name, area, 0, 0, area.beingUpdatedProperty(), configurePath);
}
/**
* Creates a selection. Name must be unique and is also used as a StyleClass
* for configuration via CSS using selectors from Path, Shape, and Node.
*/
public SelectionImpl(String name, GenericStyledArea area, int startPosition, int endPosition) {
this(name, area, new IndexRange(startPosition, endPosition), area.beingUpdatedProperty());
}
/**
* Creates a selection that is to be used in a {@link CaretSelectionBind}.
*/
SelectionImpl(String name, GenericStyledArea area, int startPosition, int endPosition,
SuspendableNo dependentBeingUpdated) {
this(name, area, new IndexRange(startPosition, endPosition), dependentBeingUpdated);
}
/**
* Creates a selection that is to be used in a {@link CaretSelectionBind} with customized configuration.
*/
SelectionImpl(String name, GenericStyledArea area, int startPosition, int endPosition,
SuspendableNo dependentBeingUpdated, Consumer configurePath) {
this(name, area, new IndexRange(startPosition, endPosition), dependentBeingUpdated, configurePath);
}
/**
* Creates a selection that is to be used in a {@link CaretSelectionBind}. It adds the style class
* {@code selection} to any {@link SelectionPath} used to render this selection.
*/
SelectionImpl(String name, GenericStyledArea area, IndexRange range,
SuspendableNo dependentBeingUpdated) {
this(name, area, range, dependentBeingUpdated, path -> path.getStyleClass().add("selection"));
}
/**
* Creates a selection that is to be used in a {@link CaretSelectionBind}
* with customized configuration and starting at the given range.
*/
SelectionImpl(String name, GenericStyledArea area, IndexRange range,
SuspendableNo dependentBeingUpdated, Consumer configurePath) {
this.name = name;
this.area = area;
this.dependentBeingUpdated = dependentBeingUpdated;
this.configurePath = configurePath;
internalRange = Var.newSimpleVar(range);
this.range = internalRange.suspendable();
length = internalRange.map(IndexRange::getLength).suspendable();
Val> documentVal = Val.create(
() -> area.subDocument(internalRange.getValue()),
internalRange, area.getParagraphs()
);
selectedDocument = documentVal.suspendable();
selectedText = documentVal.map(StyledDocument::getText).suspendable();
start2DPosition = Var.newSimpleVar(area.offsetToPosition(range.getStart(), Forward));
end2DPosition = start2DPosition.map(startPos2D ->
getLength() == 0
? startPos2D
: startPos2D.offsetBy(getLength(), Backward)
);
internalRange.addListener(obs -> {
IndexRange sel = internalRange.getValue();
start2DPosition.setValue(area.offsetToPosition(sel.getStart(), Forward));
});
startPosition = internalRange.map(IndexRange::getStart).suspendable();
startParagraphIndex = start2DPosition.map(Position::getMajor);
startColumnPosition = start2DPosition.map(Position::getMinor);
endPosition = internalRange.map(IndexRange::getEnd).suspendable();
endParagraphIndex = end2DPosition.map(Position::getMajor);
endColumnPosition = end2DPosition.map(Position::getMinor);
paragraphSpan = Val.combine(
startParagraphIndex, endParagraphIndex,
(startP, endP) -> endP - startP + 1
);
dirty = merge(
invalidationsOf(rangeProperty()),
invalidationsOf(area.getParagraphs())
);
bounds = Val.create(
() -> area.getSelectionBoundsOnScreen(this),
EventStreams.merge(area.viewportDirtyEvents(), dirty)
).suspendable();
manageSubscription(area.multiPlainChanges(), list -> {
int selectStart = getStartPosition();
int selectEnd = getEndPosition();
for (PlainTextChange plainTextChange : list) {
int changeLength = plainTextChange.getNetLength();
int indexOfChange = plainTextChange.getPosition();
// in case of a replacement: "hello there" -> "hi."
int endOfChange = indexOfChange + Math.abs(changeLength);
/*
"->" means add (positive) netLength to position
"<-" means add (negative) netLength to position
"x" means don't update position
"start / end" means what should be done in each case for each anchor if they differ
"+a" means one of the anchors was included in the deleted portion of content
"-a" means one of the anchors was not included in the deleted portion of content
Before/At/After means indexOfChange "<" / "==" / ">" position
| Before +a | Before -a | At | After
-------+---------------+-----------+--------+------
Add | N/A | -> | -> / x | x
Delete | indexOfChange | <- | x | x
*/
if (indexOfChange == selectStart && changeLength > 0) {
selectStart = selectStart + changeLength;
} else if (indexOfChange < selectStart) {
selectStart = selectStart < endOfChange
? indexOfChange
: selectStart + changeLength;
}
if (indexOfChange < selectEnd) {
selectEnd = selectEnd < endOfChange
? indexOfChange
: selectEnd + changeLength;
}
if (selectStart > selectEnd) {
selectStart = selectEnd;
}
}
selectRange(selectStart, selectEnd);
});
Suspendable omniSuspendable = Suspendable.combine(
// first, so it's released last
beingUpdated,
bounds,
endPosition,
startPosition,
selectedText,
selectedDocument,
length,
this.range
);
manageSubscription(omniSuspendable.suspendWhen(dependentBeingUpdated));
}
/* ********************************************************************** *
* *
* Actions *
* *
* Actions change the state of this control. They typically cause a *
* change of one or more observables and/or produce an event. *
* *
* ********************************************************************** */
@Override
public void selectRange(int startParagraphIndex, int startColPosition, int endParagraphIndex, int endColPosition) {
selectRange(textPosition(startParagraphIndex, startColPosition), textPosition(endParagraphIndex, endColPosition));
}
@Override
public void selectRange(int startPosition, int endPosition) {
selectRange(new IndexRange(startPosition, endPosition));
}
private void selectRange(IndexRange range) {
Runnable updateRange = () -> internalRange.setValue(range);
if (dependentBeingUpdated.get()) {
updateRange.run();
} else {
dependentBeingUpdated.suspendWhile(updateRange);
}
}
@Override
public void updateStartBy(int amount, Direction direction) {
moveBoundary(direction, amount, getStartPosition(),
newStartTextPos -> IndexRange.normalize(newStartTextPos, getEndPosition())
);
}
@Override
public void updateEndBy(int amount, Direction direction) {
moveBoundary(
direction, amount, getEndPosition(),
newEndTextPos -> IndexRange.normalize(getStartPosition(), newEndTextPos)
);
}
@Override
public void updateStartTo(int position) {
selectRange(position, getEndPosition());
}
@Override
public void updateStartTo(int paragraphIndex, int columnPosition) {
selectRange(textPosition(paragraphIndex, columnPosition), getEndPosition());
}
@Override
public void updateStartByBreaksForward(int numOfBreaks, BreakIterator breakIterator) {
updateStartByBreaks(numOfBreaks, breakIterator, true);
}
@Override
public void updateStartByBreaksBackward(int numOfBreaks, BreakIterator breakIterator) {
updateStartByBreaks(numOfBreaks, breakIterator, false);
}
@Override
public void updateEndTo(int position) {
selectRange(getStartPosition(), position);
}
@Override
public void updateEndTo(int paragraphIndex, int columnPosition) {
selectRange(getStartPosition(), textPosition(paragraphIndex, columnPosition));
}
@Override
public void updateEndByBreaksForward(int numOfBreaks, BreakIterator breakIterator) {
updateEndByBreaks(numOfBreaks, breakIterator, true);
}
@Override
public void updateEndByBreaksBackward(int numOfBreaks, BreakIterator breakIterator) {
updateEndByBreaks(numOfBreaks, breakIterator, false);
}
@Override
public void selectAll() {
selectRange(0, area.getLength());
}
@Override
public void selectParagraph(int paragraphIndex) {
int start = textPosition(paragraphIndex, 0);
int end = start + area.getParagraphLength(paragraphIndex);
selectRange(start, end);
}
@Override
public void selectWord(int wordPositionInArea) {
if(area.getLength() == 0) {
return;
}
BreakIterator breakIterator = BreakIterator.getWordInstance( getArea().getLocale() );
breakIterator.setText(area.getText());
breakIterator.preceding(wordPositionInArea);
breakIterator.next();
int wordStart = breakIterator.current();
breakIterator.following(wordPositionInArea);
breakIterator.next();
int wordEnd = breakIterator.current();
selectRange(wordStart, wordEnd);
}
@Override
public void configureSelectionPath(SelectionPath path) {
configurePath.accept(path);
}
@Override
public boolean equals(Object obj) {
return this == obj;
}
@Override
public int hashCode() {
return name.hashCode();
}
@Override
public int compareTo(SelectionImpl o) {
return Integer.compare(hashCode(), o.hashCode());
}
@Override
public String toString() {
return String.format("SelectionImpl(name=%s startPar=%s startCol=%s " +
"endPar=%s endCol=%s paragraphSpan=%s " +
"selectedDocument=%s",
name, getStartParagraphIndex(), getStartColumnPosition(),
getEndParagraphIndex(), getEndColumnPosition(), getParagraphSpan(),
getSelectedDocument());
}
@Override
public void dispose() {
subscription.unsubscribe();
}
/* ********************************************************************** *
* *
* Private methods *
* *
* ********************************************************************** */
private void manageSubscription(EventStream stream, Consumer consumer) {
manageSubscription(stream.subscribe(consumer));
}
private void manageSubscription(Subscription s) {
subscription = subscription.and(s);
}
private int textPosition(int row, int col) {
return area.position(row, col).toOffset();
}
private void moveBoundary(Direction direction, int amount, int oldBoundaryPosition,
Function updatedRange) {
switch (direction) {
case LEFT:
moveBoundary(
() -> oldBoundaryPosition - amount,
(pos) -> 0 <= pos,
updatedRange
);
break;
default: case RIGHT:
moveBoundary(
() -> oldBoundaryPosition + amount,
(pos) -> pos <= area.getLength(),
updatedRange
);
}
}
private void moveBoundary(IntSupplier textPosition, Function boundsCheckPasses,
Function updatedRange) {
int newTextPosition = textPosition.getAsInt();
if (boundsCheckPasses.apply(newTextPosition)) {
selectRange(updatedRange.apply(newTextPosition));
}
}
private void updateStartByBreaks(int numOfBreaks, BreakIterator breakIterator, boolean forwardsNotBackwards) {
updateSelectionByBreaks(numOfBreaks, breakIterator, forwardsNotBackwards, true);
}
private void updateEndByBreaks(int numOfBreaks, BreakIterator breakIterator, boolean forwardsNotBackwards) {
updateSelectionByBreaks(numOfBreaks, breakIterator, forwardsNotBackwards, false);
}
private void updateSelectionByBreaks(int numOfBreaks, BreakIterator breakIterator,
boolean followingNotPreceding, boolean updateStartNotEnd) {
if (area.getLength() == 0) {
return;
}
breakIterator.setText(area.getText());
int pos;
Runnable updateSelection;
if (updateStartNotEnd) {
pos = getStartPosition();
updateSelection = () -> selectRange(breakIterator.current(), getEndPosition());
} else {
pos = getEndPosition();
updateSelection = () -> selectRange(getStartPosition(), breakIterator.current());
}
if (followingNotPreceding) {
breakIterator.following(pos);
} else {
breakIterator.preceding(pos);
}
breakIterator.next(numOfBreaks);
updateSelection.run();
}
}