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High quality UI controls and other tools to complement the core JavaFX distribution
/**
* Copyright (c) 2014, 2016 ControlsFX
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of ControlsFX, any associated website, nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL CONTROLSFX BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package impl.org.controlsfx.behavior;
import impl.org.controlsfx.tools.rectangle.CoordinatePosition;
import impl.org.controlsfx.tools.rectangle.CoordinatePositions;
import impl.org.controlsfx.tools.rectangle.Rectangles2D;
import impl.org.controlsfx.tools.rectangle.change.MoveChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.NewChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.Rectangle2DChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.ToEastChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.ToNorthChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.ToNortheastChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.ToNorthwestChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.ToSouthChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.ToSoutheastChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.ToSouthwestChangeStrategy;
import impl.org.controlsfx.tools.rectangle.change.ToWestChangeStrategy;
import java.util.ArrayList;
import java.util.Objects;
import java.util.function.Consumer;
import javafx.event.EventType;
import javafx.geometry.Bounds;
import javafx.geometry.Point2D;
import javafx.geometry.Rectangle2D;
import javafx.scene.Cursor;
import javafx.scene.Node;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import org.controlsfx.control.SnapshotView;
import org.controlsfx.control.SnapshotView.Boundary;
import com.sun.javafx.scene.control.behavior.BehaviorBase;
import com.sun.javafx.scene.control.inputmap.InputMap;
/**
* The behavior for the {@link SnapshotView}. It is concerned with creating and changing selections according to mouse
* events handed to {@link #handleMouseEvent(MouseEvent) handleMouseEvents}.
*/
public class SnapshotViewBehavior extends BehaviorBase {
/**
* The percentage of the control's node's width/height used as a tolerance for determining whether the cursor is on
* an edge of the selection.
*/
private static final double RELATIVE_EDGE_TOLERANCE = 0.015;
/* ************************************************************************
* *
* Attributes *
* *
**************************************************************************/
/**
* The current selection change; might be {@code null}.
*/
private SelectionChange selectionChange;
/**
* A function which sets the {@link SnapshotView#selectionChangingProperty() selectionChanging} property to the
* given value.
*/
private final Consumer setSelectionChanging;
/**
* Input map for SnapshotView.
*/
private final InputMap inputMap;
/* ************************************************************************
* *
* Constructor *
* *
**************************************************************************/
/**
* Creates a new behavior for the specified {@link SnapshotView}.
*
* @param snapshotView
* the control which this behavior will control
*/
public SnapshotViewBehavior(SnapshotView snapshotView) {
super(snapshotView);
this.inputMap = createInputMap();
this.setSelectionChanging = createSetSelectionChanging();
}
@Override public InputMap getInputMap() {
return inputMap;
}
/**
* Creates a function which sets the applied boolean to {@link SnapshotView#selectionChangingProperty()}.
*
* @return a Boolean {@link Consumer}
*/
private Consumer createSetSelectionChanging() {
return changing -> getNode().getProperties().put(SnapshotView.SELECTION_CHANGING_PROPERTY_KEY, changing);
}
/* ************************************************************************
* *
* Events *
* *
**************************************************************************/
/**
* Handles the specified mouse event (possibly by creating/changing/removing a selection) and returns the matching
* cursor.
*
* @param mouseEvent
* the handled {@link MouseEvent}; must not be {@code null}
* @return the cursor which will be used for this event
*/
public Cursor handleMouseEvent(MouseEvent mouseEvent) {
Objects.requireNonNull(mouseEvent, "The argument 'mouseEvent' must not be null."); //$NON-NLS-1$
EventType eventType = mouseEvent.getEventType();
SelectionEvent selectionEvent = createSelectionEvent(mouseEvent);
if (eventType == MouseEvent.MOUSE_MOVED) {
return getCursor(selectionEvent);
}
if (eventType == MouseEvent.MOUSE_PRESSED) {
return handleMousePressedEvent(selectionEvent);
}
if (eventType == MouseEvent.MOUSE_DRAGGED) {
return handleMouseDraggedEvent(selectionEvent);
}
if (eventType == MouseEvent.MOUSE_RELEASED) {
return handleMouseReleasedEvent(selectionEvent);
}
return Cursor.DEFAULT;
}
// TRANSFORM MOUSE EVENT TO SELECTION EVENT
/**
* Creates a selection event for the specified mouse event
*
* @param mouseEvent
* the {@link MouseEvent} for which the selection event will be created
* @return the {@link SelectionEvent} for the specified mouse event
*/
private SelectionEvent createSelectionEvent(MouseEvent mouseEvent) {
Point2D point = new Point2D(mouseEvent.getX(), mouseEvent.getY());
Rectangle2D selectionBounds = createBoundsForCurrentBoundary();
CoordinatePosition position = computePosition(point);
return new SelectionEvent(mouseEvent, point, selectionBounds, position);
}
/**
* Returns the bounds according to the current {@link SnapshotView#selectionAreaBoundaryProperty()
* selectionAreaBoundary}.
*
* @return the bounds as a {@link Rectangle2D}
*/
private Rectangle2D createBoundsForCurrentBoundary() {
Boundary boundary = getNode().getSelectionAreaBoundary();
switch (boundary) {
case CONTROL:
return new Rectangle2D(0, 0, getControlWidth(), getControlHeight());
case NODE:
boolean nodeExists = getSnapshotNode() != null;
if (nodeExists) {
Bounds nodeBounds = getSnapshotNode().getBoundsInParent();
return Rectangles2D.fromBounds(nodeBounds);
} else {
return Rectangle2D.EMPTY;
}
default:
throw new IllegalArgumentException("The boundary " + boundary + " is not fully implemented."); //$NON-NLS-1$ //$NON-NLS-2$
}
}
/**
* Returns the position of the specified point relative to a possible selection.
*
* @param point
* the point (in the node's preferred coordinates) whose position will be computed
*
* @return the {@link CoordinatePosition} the event's point has relative to the control's current selection; if the
* selection is inactive this always returns {@link CoordinatePosition#OUT_OF_RECTANGLE}.
*/
private CoordinatePosition computePosition(Point2D point) {
boolean noSelection = !getNode().hasSelection() || !getNode().isSelectionActive();
boolean controlHasNoSpace = getControlWidth() == 0 || getControlHeight() == 0;
if (noSelection || controlHasNoSpace) {
return CoordinatePosition.OUT_OF_RECTANGLE;
}
double tolerance = computeTolerance();
return computePosition(getSelection(), point, tolerance);
}
/**
* Computes the tolerance which is used to determine whether the cursor is on an edge.
*
* @return the absolute tolerance
*/
private double computeTolerance() {
double controlMeanLength = Math.sqrt(getControlWidth() * getControlHeight());
return RELATIVE_EDGE_TOLERANCE * controlMeanLength;
}
/**
* Returns the position of the specified point relative to the specified selection with the specified tolerance.
*
* @param selection
* the selection relative to which the point's position will be computed; as a {@link Rectangle2D}
* @param point
* the {@link Point2D} whose position will be computed
* @param tolerance
* the absolute tolerance used to determine whether the point is on an edge
*
* @return the {@link CoordinatePosition} the event's point has relative to the control's current selection; if the
* selection is inactive this always returns {@link CoordinatePosition#OUT_OF_RECTANGLE}.
*/
private static CoordinatePosition computePosition(Rectangle2D selection, Point2D point, double tolerance) {
CoordinatePosition onEdge = CoordinatePositions.onEdges(selection, point, tolerance);
if (onEdge != null) {
return onEdge;
} else {
return CoordinatePositions.inRectangle(selection, point);
}
}
// HANDLE SELECTION EVENTS
/**
* Handles {@link MouseEvent#MOUSE_PRESSED} events by creating a new {@link #selectionChange} and beginning the
* change.
*
* @param selectionEvent
* the handled {@link SelectionEvent}
* @return the cursor which will be used while the selection changes
*/
private Cursor handleMousePressedEvent(SelectionEvent selectionEvent) {
if (selectionEvent.isPointInSelectionBounds()) {
// get all necessary information to create a selection change
Cursor cursor = getCursor(selectionEvent);
Rectangle2DChangeStrategy selectionChangeStrategy = getChangeStrategy(selectionEvent);
boolean deactivateSelectionIfClick = willDeactivateSelectionIfClick(selectionEvent);
// create and begin the selection change
selectionChange = new SelectionChangeByStrategy(
getNode(), setSelectionChanging, selectionChangeStrategy, cursor, deactivateSelectionIfClick);
selectionChange.beginSelectionChange(selectionEvent.getPoint());
} else {
// if the mouse is outside the legal bounds, the selection will not actually change
selectionChange = NoSelectionChange.INSTANCE;
}
return selectionChange.getCursor();
}
/**
* Handles {@link MouseEvent#MOUSE_DRAGGED} events by continuing the current {@link #selectionChange}.
*
* @param selectionEvent
* the handled {@link SelectionEvent}
* @return the cursor which will be used while the selection changes
*/
private Cursor handleMouseDraggedEvent(SelectionEvent selectionEvent) {
selectionChange.continueSelectionChange(selectionEvent.getPoint());
return selectionChange.getCursor();
}
/**
* Handles {@link MouseEvent#MOUSE_RELEASED} events by ending the current {@link #selectionChange} and setting it to
* {@code null}.
*
* @param selectionEvent
* the handled {@link SelectionEvent}
* @return the cursor which will be used after the selection change ends
*/
private Cursor handleMouseReleasedEvent(SelectionEvent selectionEvent) {
// end and deactivate the selection change
selectionChange.endSelectionChange(selectionEvent.getPoint());
selectionChange = null;
return getCursor(selectionEvent);
}
// CURSOR AND SELECTION CHANGE
/**
* Returns the cursor which will be used for the specified selection event.
*
* @param selectionEvent
* the {@link SelectionEvent} to check
* @return the {@link Cursor} which will be used for the event
*/
private Cursor getCursor(SelectionEvent selectionEvent) {
// show the default cursor if the mouse is out of the selection bounds
if (!selectionEvent.isPointInSelectionBounds()) {
return getRegularCursor();
}
// otherwise pick a cursor from the relative position
switch (selectionEvent.getPosition()) {
case IN_RECTANGLE:
return Cursor.MOVE;
case OUT_OF_RECTANGLE:
return getRegularCursor();
case NORTH_EDGE:
return Cursor.N_RESIZE;
case NORTHEAST_EDGE:
return Cursor.NE_RESIZE;
case EAST_EDGE:
return Cursor.E_RESIZE;
case SOUTHEAST_EDGE:
return Cursor.SE_RESIZE;
case SOUTH_EDGE:
return Cursor.S_RESIZE;
case SOUTHWEST_EDGE:
return Cursor.SW_RESIZE;
case WEST_EDGE:
return Cursor.W_RESIZE;
case NORTHWEST_EDGE:
return Cursor.NW_RESIZE;
default:
throw new IllegalArgumentException("The position " + selectionEvent.getPosition() //$NON-NLS-1$
+ " is not fully implemented."); //$NON-NLS-1$
}
}
/**
* @return the cursor from the {@link #getNode() control's} current {@link SnapshotView#cursorProperty() cursor}
*/
private Cursor getRegularCursor() {
return getNode().getCursor();
}
/**
* Returns the selection change strategy based on the specified selection event, which must be a
* {@link MouseEvent#MOUSE_PRESSED MOUSE_PRESSED} event.
*
* @param selectionEvent
* the {@link SelectionEvent} which will be checked
* @return the {@link Rectangle2DChangeStrategy} which will be executed based on the selection event
* @throws IllegalArgumentException
* if {@link SelectionEvent#getMouseEvent()} is not of type {@link MouseEvent#MOUSE_PRESSED}.
*/
private Rectangle2DChangeStrategy getChangeStrategy(SelectionEvent selectionEvent) {
boolean mousePressed = selectionEvent.getMouseEvent().getEventType() == MouseEvent.MOUSE_PRESSED;
if (!mousePressed) {
throw new IllegalArgumentException();
}
Rectangle2D selectionBounds = selectionEvent.getSelectionBounds();
switch (selectionEvent.getPosition()) {
case IN_RECTANGLE:
return new MoveChangeStrategy(getSelection(), selectionBounds);
case OUT_OF_RECTANGLE:
return new NewChangeStrategy(
isSelectionRatioFixed(), getSelectionRatio(), selectionBounds);
case NORTH_EDGE:
return new ToNorthChangeStrategy(
getSelection(), isSelectionRatioFixed(), getSelectionRatio(), selectionBounds);
case NORTHEAST_EDGE:
return new ToNortheastChangeStrategy(
getSelection(), isSelectionRatioFixed(), getSelectionRatio(), selectionBounds);
case EAST_EDGE:
return new ToEastChangeStrategy(
getSelection(), isSelectionRatioFixed(), getSelectionRatio(), selectionBounds);
case SOUTHEAST_EDGE:
return new ToSoutheastChangeStrategy(
getSelection(), isSelectionRatioFixed(), getSelectionRatio(), selectionBounds);
case SOUTH_EDGE:
return new ToSouthChangeStrategy(
getSelection(), isSelectionRatioFixed(), getSelectionRatio(), selectionBounds);
case SOUTHWEST_EDGE:
return new ToSouthwestChangeStrategy(
getSelection(), isSelectionRatioFixed(), getSelectionRatio(), selectionBounds);
case WEST_EDGE:
return new ToWestChangeStrategy(
getSelection(), isSelectionRatioFixed(), getSelectionRatio(), selectionBounds);
case NORTHWEST_EDGE:
return new ToNorthwestChangeStrategy(
getSelection(), isSelectionRatioFixed(), getSelectionRatio(), selectionBounds);
default:
throw new IllegalArgumentException("The position " + selectionEvent.getPosition() //$NON-NLS-1$
+ " is not fully implemented."); //$NON-NLS-1$
}
}
/**
* Checks whether the selection will be deactivated if the mouse is clicked at the {@link SelectionEvent}.
*
* @param selectionEvent
* the selection event which will be checked
* @return {@code true} if the selection event is such that the selection will be deactivated if the mouse is only
* clicked
*/
private static boolean willDeactivateSelectionIfClick(SelectionEvent selectionEvent) {
boolean rightClick = selectionEvent.getMouseEvent().getButton() == MouseButton.SECONDARY;
boolean outOfAreaClick = selectionEvent.getPosition() == CoordinatePosition.OUT_OF_RECTANGLE;
return rightClick || outOfAreaClick;
}
/* ************************************************************************
* *
* Usability Access Functions to SnapshotView Properties *
* *
**************************************************************************/
/**
* The control's width.
*
* @return {@link SnapshotView#getWidth()}
*/
private double getControlWidth() {
return getNode().getWidth();
}
/**
* The control's height.
*
* @return {@link SnapshotView#getHeight()}
*/
private double getControlHeight() {
return getNode().getHeight();
}
/**
* The currently displayed node.
*
* @return {@link SnapshotView#getNode()}
*/
private Node getSnapshotNode() {
return getNode().getNode();
}
/**
* The current selection.
*
* @return {@link SnapshotView#getSelection()}
*/
private Rectangle2D getSelection() {
return getNode().getSelection();
}
/**
* Indicates whether the current selection has a fixed ratio.
*
* @return {@link SnapshotView#isSelectionRatioFixed()}
*/
private boolean isSelectionRatioFixed() {
return getNode().isSelectionRatioFixed();
}
/**
* The current selection's fixed ratio.
*
* @return {@link SnapshotView#getFixedSelectionRatio()}
*/
private double getSelectionRatio() {
return getNode().getFixedSelectionRatio();
}
/* ************************************************************************
* *
* Inner Classes *
* *
**************************************************************************/
/**
* A selection event encapsulates a {@link MouseEvent} and adds some additional information like the coordinates
* relative to the node's preferred size and its position relative to a selection.
*/
private static class SelectionEvent {
/**
* The {@link MouseEvent} for which this selection event was created.
*/
private final MouseEvent mouseEvent;
/**
* The coordinates of the mouse event as a {@link Point2D}.
*/
private final Point2D point;
/**
* The {@link Rectangle2D} within which any new selection must be contained.
*/
private final Rectangle2D selectionBounds;
/**
* The {@link #point}'s position relative to a possible selection.
*/
private final CoordinatePosition position;
/**
* Creates a new selection event with the specified arguments.
*
* @param mouseEvent
* the {@link MouseEvent} for which this selection event is created
* @param point
* the coordinates of the mouse event as a {@link Point2D}
* @param selectionBounds
* the {@link Rectangle2D} within which any new selection must be contained
* @param position
* the point's position relative to a possible selection
*/
public SelectionEvent(
MouseEvent mouseEvent, Point2D point, Rectangle2D selectionBounds, CoordinatePosition position) {
this.mouseEvent = mouseEvent;
this.point = point;
this.selectionBounds = selectionBounds;
this.position = position;
}
/**
* @return the mouse event for which this selection event was created
*/
public MouseEvent getMouseEvent() {
return mouseEvent;
}
/**
* @return the coordinates of the mouse event in the nodes' preferred coordinates
*/
public Point2D getPoint() {
return point;
}
/**
* @return the {@link Rectangle2D} within which any new selection must be contained
*/
public Rectangle2D getSelectionBounds() {
return selectionBounds;
}
/**
* @return {@code true} if the {@link #getSelectionBounds() selectionBounds} contains the {@link #getPoint()
* point}; otherwise {@code false}
*/
public boolean isPointInSelectionBounds() {
return selectionBounds.contains(point);
}
/**
* @return the {@link #getPoint() point}'s position relative to a possible selection.
*/
public CoordinatePosition getPosition() {
return position;
}
}
/**
* Handles the actual change of a selection when the mouse is pressed, dragged and released.
*/
private static interface SelectionChange {
/**
* Begins the selection change at the specified point.
*
* @param point
* the starting point of the selection change
*/
public abstract void beginSelectionChange(Point2D point);
/**
* Continues the selection change to the specified point.
*
* @param point
* the next point of this selection change
*/
public abstract void continueSelectionChange(Point2D point);
/**
* Ends the selection change at the specified point.
*
* @param point
* the final point of this selection change
*/
public abstract void endSelectionChange(Point2D point);
/**
* The cursor for this selection change.
*
* @return the cursor for this selection change
*/
public abstract Cursor getCursor();
}
/**
* Implementation of {@link SelectionChange} which does not actually change anything.
*/
private static class NoSelectionChange implements SelectionChange {
/**
* The singleton instance.
*/
public static final NoSelectionChange INSTANCE = new NoSelectionChange();
/**
* Private constructor for singleton.
*/
private NoSelectionChange() {
// nothing to do
}
@Override
public void beginSelectionChange(Point2D point) {
// nothing to do
}
@Override
public void continueSelectionChange(Point2D point) {
// nothing to do
}
@Override
public void endSelectionChange(Point2D point) {
// nothing to do
}
@Override
public Cursor getCursor() {
return Cursor.DEFAULT;
}
}
/**
* Executes the changes from a {@link Rectangle2DChangeStrategy} on a {@link SnapshotView}'s
* {@link SnapshotView#selectionProperty() selection} property. This includes to check whether the mouse moved from
* the change's start to end and to possibly deactivate the selection if not.
*/
private static class SelectionChangeByStrategy implements SelectionChange {
// Attributes
/**
* The snapshot view whose selection will be changed.
*/
private final SnapshotView snapshotView;
/**
* A function which sets the {@link SnapshotView#selectionChangingProperty() selectionChanging} property to the
* given value.
*/
private final Consumer setSelectionChanging;
/**
* The executed change strategy.
*/
private final Rectangle2DChangeStrategy selectionChangeStrategy;
/**
* The cursor during the selection change.
*/
private final Cursor cursor;
/**
* Indicates if the selection will be deactivated if the mouse is only clicked (e.g. does not move between start
* and end).
*/
private final boolean deactivateSelectionIfClick;
/**
* The change's starting point. Used to check whether the mouse moved.
*/
private Point2D startingPoint;
/**
* Set to true as soon as the mouse moved away from the starting point.
*/
private boolean mouseMoved;
// Constructor
/**
* Creates a new selection change for the specified {@link SnapshotView} using the specified
* {@link Rectangle2DChangeStrategy}.
*
* @param snapshotView
* the {@link SnapshotView} whose selection will be changed
* @param setSelectionChanging
* a function which sets the {@link SnapshotView#selectionChangingProperty() selectionChanging}
* property to the given value
* @param selectionChangeStrategy
* the {@link Rectangle2DChangeStrategy} used to change the selection
* @param cursor
* the {@link Cursor} used during the selection change
* @param deactivateSelectionIfClick
* indicates whether the selection will be deactivated if the change is only a click
*/
public SelectionChangeByStrategy(
SnapshotView snapshotView, Consumer setSelectionChanging,
Rectangle2DChangeStrategy selectionChangeStrategy, Cursor cursor, boolean deactivateSelectionIfClick) {
this.snapshotView = snapshotView;
this.setSelectionChanging = setSelectionChanging;
this.selectionChangeStrategy = selectionChangeStrategy;
this.cursor = cursor;
this.deactivateSelectionIfClick = deactivateSelectionIfClick;
}
// Selection Change
@Override
public void beginSelectionChange(Point2D point) {
startingPoint = point;
setSelectionChanging.accept(true);
Rectangle2D newSelection = selectionChangeStrategy.beginChange(point);
snapshotView.setSelection(newSelection);
}
@Override
public void continueSelectionChange(Point2D point) {
updateMouseMoved(point);
Rectangle2D newSelection = selectionChangeStrategy.continueChange(point);
snapshotView.setSelection(newSelection);
}
@Override
public void endSelectionChange(Point2D point) {
updateMouseMoved(point);
Rectangle2D newSelection = selectionChangeStrategy.endChange(point);
snapshotView.setSelection(newSelection);
boolean deactivateSelection = deactivateSelectionIfClick && !mouseMoved;
if (deactivateSelection) {
snapshotView.setSelection(null);
}
setSelectionChanging.accept(false);
}
/**
* Updates {@link #mouseMoved} by checking whether the specified point is different from the
* {@link #startingPoint}.
*
* @param point
* the point which will be compared to the {@link #startingPoint}
*/
private void updateMouseMoved(Point2D point) {
// if the mouse already moved, do nothing
if (mouseMoved) {
return;
}
// if the mouse did not move yet, check whether it did now
boolean mouseMovedNow = !startingPoint.equals(point);
mouseMoved = mouseMovedNow;
}
// Attribute Access
@Override
public Cursor getCursor() {
return cursor;
}
}
}
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