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/*
* Copyright (c) 2011, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javafx.css;
import com.sun.javafx.css.TransitionMediator;
import com.sun.javafx.css.TransitionDefinition;
import com.sun.javafx.scene.NodeHelper;
import javafx.animation.Interpolatable;
import javafx.beans.property.ObjectPropertyBase;
import javafx.beans.value.ObservableValue;
import javafx.scene.Node;
import java.util.Objects;
/**
* This class extends {@code ObjectPropertyBase} and provides a partial
* implementation of a {@code StyleableProperty}. The method
* {@link StyleableProperty#getCssMetaData()} is not implemented.
*
* This class is used to make a {@link javafx.beans.property.ObjectProperty},
* that would otherwise be implemented as a {@link ObjectPropertyBase},
* styleable by CSS.
*
* @param the property value type
* @see javafx.beans.property.ObjectPropertyBase
* @see CssMetaData
* @see StyleableProperty
* @since JavaFX 8.0
*/
public abstract class StyleableObjectProperty
extends ObjectPropertyBase implements StyleableProperty {
/**
* The constructor of the {@code StyleableObjectProperty}.
*/
public StyleableObjectProperty() {
super();
}
/**
* The constructor of the {@code StyleableObjectProperty}.
*
* @param initialValue
* the initial value of the wrapped {@code Object}
*/
public StyleableObjectProperty(T initialValue) {
super(initialValue);
}
/** {@inheritDoc} */
@Override
public void applyStyle(StyleOrigin origin, T newValue) {
T oldValue;
if (newValue == null) {
set(null);
} else if (!(newValue instanceof Interpolatable)
|| ((oldValue = get()) == null)
|| !(newValue.getClass().isInstance(oldValue))) {
// Consider a case where T := Paint. Now 'oldValue' could be a Color instance, while 'newValue' could
// be a LinearGradient instance. Both types implement Interpolatable, but with different type arguments.
// We detect this case by checking whether 'newValue' is an instance of 'oldValue' (so that
// oldValue.interpolate(newValue, t) succeeds), and skipping the transition when the test fails.
set(newValue);
} else {
// If this.origin == null, we're setting the value for the first time.
// No transition should be started in this case.
TransitionDefinition transition = this.origin != null && getBean() instanceof Node node ?
NodeHelper.findTransitionDefinition(node, getCssMetaData()) : null;
if (transition == null) {
set(newValue);
} else if (mediator == null || !Objects.equals(mediator.newValue, newValue)) {
// We only start a new transition if the new target value is different from the target
// value of the existing transition. This scenario can sometimes happen when a CSS value
// is redundantly applied, which would cause unexpected animations if we allowed the new
// transition to interrupt the existing transition.
mediator = new TransitionMediatorImpl(oldValue, newValue);
mediator.run(transition);
}
}
this.origin = origin;
}
/** {@inheritDoc} */
@Override
public void bind(ObservableValue observable) {
super.bind(observable);
origin = StyleOrigin.USER;
// Calling the 'bind' method always cancels a transition timer.
if (mediator != null) {
mediator.cancel(true);
}
}
/** {@inheritDoc} */
@Override
public void set(T v) {
super.set(v);
// Calling the 'set' method cancels the transition timer, but not if the 'set' method was
// directly called by the timer itself (i.e. a timer will not accidentally cancel itself).
// Note that indirect cancellation is still possible: a timer may fire a transition event,
// which could cause user code to be executed that invokes this 'set' method. In that case,
// the call will cancel the timer.
if (mediator == null || mediator.cancel(false)) {
origin = StyleOrigin.USER;
}
}
/** {@inheritDoc} */
@Override
public StyleOrigin getStyleOrigin() { return origin; }
private StyleOrigin origin = null;
private TransitionMediatorImpl mediator = null;
private final class TransitionMediatorImpl extends TransitionMediator {
private final T oldValue;
private final T newValue;
TransitionMediatorImpl(T oldValue, T newValue) {
this.oldValue = oldValue;
this.newValue = newValue;
}
@Override
@SuppressWarnings("unchecked")
public void onUpdate(double progress) {
set(progress < 1 ? ((Interpolatable)oldValue).interpolate(newValue, progress) : newValue);
}
@Override
public void onStop() {
// When the transition is cancelled or completed, we clear the reference to this mediator.
// However, when this mediator was cancelled by a reversing transition, the 'mediator' field
// refers to the reversing mediator, and not to this mediator. We need to be careful to only
// clear references to this mediator.
if (mediator == this) {
mediator = null;
}
}
@Override
public StyleableProperty getStyleableProperty() {
return StyleableObjectProperty.this;
}
}
}
