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Rich-text area for JavaFX
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package org.fxmisc.richtext;
import static java.lang.Character.*;
import static javafx.scene.input.KeyCode.*;
import static javafx.scene.input.KeyCombination.*;
import static org.fxmisc.richtext.model.TwoDimensional.Bias.*;
import static org.fxmisc.wellbehaved.event.EventPattern.*;
import static org.fxmisc.wellbehaved.event.template.InputMapTemplate.*;
import static org.reactfx.EventStreams.*;
import java.util.function.Predicate;
import javafx.event.Event;
import javafx.geometry.Bounds;
import javafx.geometry.Point2D;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.IndexRange;
import javafx.scene.input.ContextMenuEvent;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import org.fxmisc.richtext.model.NavigationActions.SelectionPolicy;
import org.fxmisc.richtext.model.TwoDimensional.Position;
import org.fxmisc.wellbehaved.event.EventPattern;
import org.fxmisc.wellbehaved.event.InputHandler.Result;
import org.fxmisc.wellbehaved.event.template.InputMapTemplate;
import org.reactfx.EventStream;
import org.reactfx.value.Val;
import org.reactfx.value.Var;
/**
* Controller for GenericStyledArea.
*/
class StyledTextAreaBehavior {
private static final boolean isMac;
private static final boolean isWindows;
static {
String os = System.getProperty("os.name");
isMac = os.startsWith("Mac");
isWindows = os.startsWith("Windows");
}
private static final InputMapTemplate EVENT_TEMPLATE;
static {
SelectionPolicy selPolicy = isMac
? SelectionPolicy.EXTEND
: SelectionPolicy.ADJUST;
InputMapTemplate editsBase = sequence(
// deletion
consume(keyPressed(DELETE), StyledTextAreaBehavior::deleteForward),
consume(keyPressed(BACK_SPACE), StyledTextAreaBehavior::deleteBackward),
consume(keyPressed(DELETE, SHORTCUT_DOWN), StyledTextAreaBehavior::deleteNextWord),
consume(keyPressed(BACK_SPACE, SHORTCUT_DOWN), StyledTextAreaBehavior::deletePrevWord),
// cut
consume(
anyOf(keyPressed(CUT), keyPressed(X, SHORTCUT_DOWN), keyPressed(DELETE, SHIFT_DOWN)),
(b, e) -> b.view.cut()),
// paste
consume(
anyOf(keyPressed(PASTE), keyPressed(V, SHORTCUT_DOWN), keyPressed(INSERT, SHIFT_DOWN)),
(b, e) -> b.view.paste()),
// tab & newline
consume(keyPressed(ENTER), (b, e) -> b.view.replaceSelection("\n")),
consume(keyPressed(TAB), (b, e) -> b.view.replaceSelection("\t")),
// undo/redo
consume(keyPressed(Z, SHORTCUT_DOWN), (b, e) -> b.view.undo()),
consume(
anyOf(keyPressed(Y, SHORTCUT_DOWN), keyPressed(Z, SHORTCUT_DOWN, SHIFT_DOWN)),
(b, e) -> b.view.redo())
);
InputMapTemplate edits = when(b -> b.view.isEditable(), editsBase);
InputMapTemplate verticalNavigation = sequence(
// vertical caret movement
consume(
anyOf(keyPressed(UP), keyPressed(KP_UP)),
(b, e) -> b.prevLine(SelectionPolicy.CLEAR)),
consume(
anyOf(keyPressed(DOWN), keyPressed(KP_DOWN)),
(b, e) -> b.nextLine(SelectionPolicy.CLEAR)),
consume(keyPressed(PAGE_UP), (b, e) -> b.view.prevPage(SelectionPolicy.CLEAR)),
consume(keyPressed(PAGE_DOWN), (b, e) -> b.view.nextPage(SelectionPolicy.CLEAR)),
// vertical selection
consume(
anyOf(keyPressed(UP, SHIFT_DOWN), keyPressed(KP_UP, SHIFT_DOWN)),
(b, e) -> b.prevLine(SelectionPolicy.ADJUST)),
consume(
anyOf(keyPressed(DOWN, SHIFT_DOWN), keyPressed(KP_DOWN, SHIFT_DOWN)),
(b, e) -> b.nextLine(SelectionPolicy.ADJUST)),
consume(keyPressed(PAGE_UP, SHIFT_DOWN), (b, e) -> b.view.prevPage(SelectionPolicy.ADJUST)),
consume(keyPressed(PAGE_DOWN, SHIFT_DOWN), (b, e) -> b.view.nextPage(SelectionPolicy.ADJUST))
);
InputMapTemplate otherNavigation = sequence(
// caret movement
consume(anyOf(keyPressed(RIGHT), keyPressed(KP_RIGHT)), StyledTextAreaBehavior::right),
consume(anyOf(keyPressed(LEFT), keyPressed(KP_LEFT)), StyledTextAreaBehavior::left),
consume(keyPressed(HOME), (b, e) -> b.view.lineStart(SelectionPolicy.CLEAR)),
consume(keyPressed(END), (b, e) -> b.view.lineEnd(SelectionPolicy.CLEAR)),
consume(
anyOf(
keyPressed(RIGHT, SHORTCUT_DOWN),
keyPressed(KP_RIGHT, SHORTCUT_DOWN)
), (b, e) -> b.skipToNextWord(SelectionPolicy.CLEAR)),
consume(
anyOf(
keyPressed(LEFT, SHORTCUT_DOWN),
keyPressed(KP_LEFT, SHORTCUT_DOWN)
), (b, e) -> b.skipToPrevWord(SelectionPolicy.CLEAR)),
consume(keyPressed(HOME, SHORTCUT_DOWN), (b, e) -> b.view.start(SelectionPolicy.CLEAR)),
consume(keyPressed(END, SHORTCUT_DOWN), (b, e) -> b.view.end(SelectionPolicy.CLEAR)),
// selection
consume(
anyOf(
keyPressed(RIGHT, SHIFT_DOWN),
keyPressed(KP_RIGHT, SHIFT_DOWN)
), StyledTextAreaBehavior::selectRight),
consume(
anyOf(
keyPressed(LEFT, SHIFT_DOWN),
keyPressed(KP_LEFT, SHIFT_DOWN)
), StyledTextAreaBehavior::selectLeft),
consume(keyPressed(HOME, SHIFT_DOWN), (b, e) -> b.view.lineStart(selPolicy)),
consume(keyPressed(END, SHIFT_DOWN), (b, e) -> b.view.lineEnd(selPolicy)),
consume(keyPressed(HOME, SHIFT_DOWN, SHORTCUT_DOWN), (b, e) -> b.view.start(selPolicy)),
consume(keyPressed(END, SHIFT_DOWN, SHORTCUT_DOWN), (b, e) -> b.view.end(selPolicy)),
consume(
anyOf(
keyPressed(RIGHT, SHIFT_DOWN, SHORTCUT_DOWN),
keyPressed(KP_RIGHT, SHIFT_DOWN, SHORTCUT_DOWN)
), (b, e) -> b.skipToNextWord(selPolicy)),
consume(
anyOf(
keyPressed(LEFT, SHIFT_DOWN, SHORTCUT_DOWN),
keyPressed(KP_LEFT, SHIFT_DOWN, SHORTCUT_DOWN)
), (b, e) -> b.skipToPrevWord(selPolicy)),
consume(keyPressed(A, SHORTCUT_DOWN), (b, e) -> b.view.selectAll())
);
InputMapTemplate copyAction = consume(
anyOf(
keyPressed(COPY),
keyPressed(C, SHORTCUT_DOWN),
keyPressed(INSERT, SHORTCUT_DOWN)
), (b, e) -> b.view.copy()
);
Predicate noControlKeys = e ->
// filter out control keys
(!e.isControlDown() && !e.isMetaDown())
// except on Windows allow the Ctrl+Alt combination (produced by AltGr)
|| (isWindows && !e.isMetaDown() && (!e.isControlDown() || e.isAltDown()));
Predicate isChar = e ->
e.getCode().isLetterKey() ||
e.getCode().isDigitKey() ||
e.getCode().isWhitespaceKey();
InputMapTemplate charPressConsumer = consume(keyPressed().onlyIf(isChar.and(noControlKeys)));
InputMapTemplate keyPressedTemplate = edits
.orElse(otherNavigation).ifConsumed((b, e) -> b.view.clearTargetCaretOffset())
.orElse(verticalNavigation)
.orElse(copyAction)
.ifConsumed((b, e) -> b.view.requestFollowCaret())
// no need to add 'ifConsumed' after charPress since
// requestFollowCaret is called in keyTypedTemplate
.orElse(charPressConsumer);
InputMapTemplate keyTypedBase = consume(
// character input
EventPattern.keyTyped().onlyIf(noControlKeys.and(e -> isLegal(e.getCharacter()))),
StyledTextAreaBehavior::keyTyped
).ifConsumed((b, e) -> b.view.requestFollowCaret());
InputMapTemplate keyTypedTemplate = when(b -> b.view.isEditable(), keyTypedBase);
InputMapTemplate mousePressedTemplate = sequence(
// ignore mouse pressed events if the view is disabled
process(mousePressed(MouseButton.PRIMARY), (b, e) -> b.view.isDisabled() ? Result.IGNORE : Result.PROCEED),
// hide context menu before any other handling
process(
mousePressed(), (b, e) -> {
b.view.hideContextMenu();
return Result.PROCEED;
}
),
consume(
mousePressed(MouseButton.PRIMARY).onlyIf(MouseEvent::isShiftDown),
StyledTextAreaBehavior::handleShiftPress
),
consume(
mousePressed(MouseButton.PRIMARY).onlyIf(e -> e.getClickCount() == 1),
StyledTextAreaBehavior::handleFirstPrimaryPress
),
consume(
mousePressed(MouseButton.PRIMARY).onlyIf(e -> e.getClickCount() == 2),
StyledTextAreaBehavior::handleSecondPress
),
consume(
mousePressed(MouseButton.PRIMARY).onlyIf(e -> e.getClickCount() == 3),
StyledTextAreaBehavior::handleThirdPress
)
);
Predicate primaryOnlyButton = e -> e.getButton() == MouseButton.PRIMARY && !e.isMiddleButtonDown() && !e.isSecondaryButtonDown();
InputMapTemplate mouseDragDetectedTemplate = consume(
eventType(MouseEvent.DRAG_DETECTED).onlyIf(primaryOnlyButton),
(b, e) -> b.handlePrimaryOnlyDragDetected()
);
InputMapTemplate mouseDragTemplate = sequence(
process(
mouseDragged().onlyIf(primaryOnlyButton),
StyledTextAreaBehavior::processPrimaryOnlyMouseDragged
),
consume(
mouseDragged(),
StyledTextAreaBehavior::continueOrStopAutoScroll
)
);
InputMapTemplate mouseReleasedTemplate = sequence(
process(
EventPattern.mouseReleased().onlyIf(primaryOnlyButton),
StyledTextAreaBehavior::processMouseReleased
),
consume(
mouseReleased(),
(b, e) -> b.autoscrollTo.setValue(null) // stop auto scroll
)
);
InputMapTemplate mouseTemplate = sequence(
mousePressedTemplate, mouseDragDetectedTemplate, mouseDragTemplate, mouseReleasedTemplate
);
InputMapTemplate contextMenuEventTemplate = consumeWhen(
EventPattern.eventType(ContextMenuEvent.CONTEXT_MENU_REQUESTED),
b -> !b.view.isDisabled() && b.view.isContextMenuPresent(),
StyledTextAreaBehavior::showContextMenu
);
EVENT_TEMPLATE = sequence(mouseTemplate, keyPressedTemplate, keyTypedTemplate, contextMenuEventTemplate);
}
/**
* Possible dragging states.
*/
private enum DragState {
/** No dragging is happening. */
NO_DRAG,
/** Mouse has been pressed inside of selected text, but drag has not been detected yet. */
POTENTIAL_DRAG,
/** Drag in progress. */
DRAG,
}
/* ********************************************************************** *
* Fields *
* ********************************************************************** */
private final GenericStyledArea view;
/**
* Indicates whether selection is being dragged by the user.
*/
private DragState dragSelection = DragState.NO_DRAG;
private final Var autoscrollTo = Var.newSimpleVar(null);
/* ********************************************************************** *
* Constructors *
* ********************************************************************** */
StyledTextAreaBehavior(GenericStyledArea area) {
this.view = area;
InputMapTemplate.installFallback(EVENT_TEMPLATE, this, b -> b.view);
// setup auto-scroll
Val projection = Val.combine(
autoscrollTo,
area.layoutBoundsProperty(),
StyledTextAreaBehavior::project);
Val distance = Val.combine(
autoscrollTo,
projection,
Point2D::subtract);
EventStream deltas = nonNullValuesOf(distance)
.emitBothOnEach(animationFrames())
.map(t -> t.map((ds, nanos) -> ds.multiply(nanos / 100_000_000.0)));
valuesOf(autoscrollTo).flatMap(p -> p == null
? never() // automatically stops the scroll animation
: deltas)
.subscribe(ds -> {
area.scrollBy(ds);
projection.ifPresent(this::dragTo);
});
}
/* ********************************************************************** *
* Key handling implementation *
* ********************************************************************** */
private void keyTyped(KeyEvent event) {
String text = event.getCharacter();
int n = text.length();
if(n == 0) {
return;
}
view.replaceSelection(text);
}
private static boolean isLegal(String text) {
int n = text.length();
for(int i = 0; i < n; ++i) {
if(Character.isISOControl(text.charAt(i))) {
return false;
}
}
return true;
}
private void deleteBackward(KeyEvent ignore) {
IndexRange selection = view.getSelection();
if(selection.getLength() == 0) {
view.deletePreviousChar();
} else {
view.replaceSelection("");
}
}
private void deleteForward(KeyEvent ignore) {
IndexRange selection = view.getSelection();
if(selection.getLength() == 0) {
view.deleteNextChar();
} else {
view.replaceSelection("");
}
}
private void left(KeyEvent ignore) {
IndexRange sel = view.getSelection();
if(sel.getLength() == 0) {
view.previousChar(SelectionPolicy.CLEAR);
} else {
view.moveTo(sel.getStart(), SelectionPolicy.CLEAR);
}
}
private void right(KeyEvent ignore) {
IndexRange sel = view.getSelection();
if(sel.getLength() == 0) {
view.nextChar(SelectionPolicy.CLEAR);
} else {
view.moveTo(sel.getEnd(), SelectionPolicy.CLEAR);
}
}
private void selectLeft(KeyEvent ignore) {
view.previousChar(SelectionPolicy.ADJUST);
}
private void selectRight(KeyEvent ignore) {
view.nextChar(SelectionPolicy.ADJUST);
}
private void deletePrevWord(KeyEvent ignore) {
int end = view.getCaretPosition();
if (end > 0) {
view.wordBreaksBackwards(2, SelectionPolicy.CLEAR);
int start = view.getCaretPosition();
view.replaceText(start, end, "");
}
}
private void deleteNextWord(KeyEvent ignore) {
int start = view.getCaretPosition();
if (start < view.getLength()) {
view.wordBreaksForwards(2, SelectionPolicy.CLEAR);
int end = view.getCaretPosition();
view.replaceText(start, end, "");
}
}
private void downLines(SelectionPolicy selectionPolicy, int nLines) {
Position currentLine = view.currentLine();
Position targetLine = currentLine.offsetBy(nLines, Forward).clamp();
if(!currentLine.sameAs(targetLine)) {
// compute new caret position
CharacterHit hit = view.hit(view.getTargetCaretOffset(), targetLine);
// update model
view.moveTo(hit.getInsertionIndex(), selectionPolicy);
}
}
private void prevLine(SelectionPolicy selectionPolicy) {
downLines(selectionPolicy, -1);
}
private void nextLine(SelectionPolicy selectionPolicy) {
downLines(selectionPolicy, 1);
}
private void skipToPrevWord(SelectionPolicy selectionPolicy) {
int caretPos = view.getCaretPosition();
// if (0 == caretPos), do nothing as can't move to the left anyway
if (1 <= caretPos ) {
boolean prevCharIsWhiteSpace = isWhitespace(view.getText(caretPos - 1, caretPos).charAt(0));
view.wordBreaksBackwards(prevCharIsWhiteSpace ? 2 : 1, selectionPolicy);
}
}
private void skipToNextWord(SelectionPolicy selectionPolicy) {
int caretPos = view.getCaretPosition();
int length = view.getLength();
// if (caretPos == length), do nothing as can't move to the right anyway
if (caretPos <= length - 1) {
boolean nextCharIsWhiteSpace = isWhitespace(view.getText(caretPos, caretPos + 1).charAt(0));
view.wordBreaksForwards(nextCharIsWhiteSpace ? 2 : 1, selectionPolicy);
}
}
/* ********************************************************************** *
* Mouse handling implementation *
* ********************************************************************** */
private void showContextMenu(ContextMenuEvent e) {
ContextMenu menu = view.getContextMenu();
double xOffset = view.getContextMenuXOffset();
double yOffset = view.getContextMenuYOffset();
menu.show(view, e.getScreenX() + xOffset, e.getScreenY() + yOffset);
}
private void handleShiftPress(MouseEvent e) {
// ensure focus
view.requestFocus();
CharacterHit hit = view.hit(e.getX(), e.getY());
// On Mac always extend selection,
// switching anchor and caret if necessary.
view.moveTo(hit.getInsertionIndex(), isMac ? SelectionPolicy.EXTEND : SelectionPolicy.ADJUST);
}
private void handleFirstPrimaryPress(MouseEvent e) {
// ensure focus
view.requestFocus();
CharacterHit hit = view.hit(e.getX(), e.getY());
view.clearTargetCaretOffset();
IndexRange selection = view.getSelection();
if(view.isEditable() &&
selection.getLength() != 0 &&
hit.getCharacterIndex().isPresent() &&
hit.getCharacterIndex().getAsInt() >= selection.getStart() &&
hit.getCharacterIndex().getAsInt() < selection.getEnd()) {
// press inside selection
dragSelection = DragState.POTENTIAL_DRAG;
} else {
dragSelection = DragState.NO_DRAG;
view.getOnOutsideSelectionMousePress().accept(e);
}
}
private void handleSecondPress(MouseEvent e) {
view.selectWord();
}
private void handleThirdPress(MouseEvent e) {
view.selectParagraph();
}
private void handlePrimaryOnlyDragDetected() {
if (dragSelection == DragState.POTENTIAL_DRAG) {
dragSelection = DragState.DRAG;
}
}
private Result processPrimaryOnlyMouseDragged(MouseEvent e) {
Point2D p = new Point2D(e.getX(), e.getY());
if(view.getLayoutBounds().contains(p)) {
dragTo(p);
}
view.setAutoScrollOnDragDesired(true);
// autoScrollTo will be set in "continueOrStopAutoScroll(MouseEvent)"
return Result.PROCEED;
}
private void continueOrStopAutoScroll(MouseEvent e) {
if (!view.isAutoScrollOnDragDesired()) {
autoscrollTo.setValue(null); // stops auto-scroll
}
Point2D p = new Point2D(e.getX(), e.getY());
if(view.getLayoutBounds().contains(p)) {
autoscrollTo.setValue(null); // stops auto-scroll
} else {
autoscrollTo.setValue(p); // starts auto-scroll
}
}
private void dragTo(Point2D point) {
if(dragSelection == DragState.DRAG ||
dragSelection == DragState.POTENTIAL_DRAG) { // MOUSE_DRAGGED may arrive even before DRAG_DETECTED
view.getOnSelectionDrag().accept(point);
} else {
view.getOnNewSelectionDrag().accept(point);
}
}
private Result processMouseReleased(MouseEvent e) {
if (view.isDisabled()) {
return Result.IGNORE;
}
switch(dragSelection) {
case POTENTIAL_DRAG:
// selection was not dragged, but clicked
view.getOnInsideSelectionMousePressRelease().accept(e);
case DRAG:
view.getOnSelectionDrop().accept(e);
case NO_DRAG:
// do nothing, caret already repositioned in "handle[Number]Press(MouseEvent)"
}
dragSelection = DragState.NO_DRAG;
return Result.PROCEED;
}
private static Point2D project(Point2D p, Bounds bounds) {
double x = clamp(p.getX(), bounds.getMinX(), bounds.getMaxX());
double y = clamp(p.getY(), bounds.getMinY(), bounds.getMaxY());
return new Point2D(x, y);
}
private static double clamp(double x, double min, double max) {
return Math.min(Math.max(x, min), max);
}
}