Transition.java
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上传日期:2022-06-15
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文件大小:4k
- /*
- * Copyright 2008 Sun Microsystems, Inc. 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. Sun designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
- */
- package com.sun.lwuit.animations;
- import com.sun.lwuit.Component;
- import com.sun.lwuit.Container;
- import com.sun.lwuit.Form;
- import com.sun.lwuit.Graphics;
- /**
- * Represents a transition animation between two forms this class is used internally
- * by Display to play an animation when moving from one form to the next. A transition
- * can be installed on a {@link com.sun.lwuit.Form} object using the in/out transitions, for ease of use
- * {@link com.sun.lwuit.plaf.LookAndFeel} has support for default transitions.
- *
- * @author Shai Almog
- */
- public abstract class Transition implements Animation {
- private Component source;
-
- private Component destination;
-
- /**
- * Invoked by {@link com.sun.lwuit.Display} to set the source and destination forms.
- * This method should not be invoked by developers.
- *
- * @param source the source form from which the transition originates
- * @param destination the destination form to which the transition will lead
- */
- public final void init(Component source, Component destination){
- this.source = source;
- this.destination = destination;
- if (source != null && source instanceof Container) {
- ((Container)source).layoutContainer();
- }
- if (destination != null && destination instanceof Container) {
- ((Container)destination).layoutContainer();
- }
- }
-
- /**
- * Callback thats invoked before a transition begins, the source form may be null
- * for the first form in the application.
- */
- public void initTransition(){
- }
-
- /**
- * Returns the destination form that should be set once animation is completed
- *
- * @return the destination component
- */
- public final Component getDestination(){
- return destination;
- }
-
- /**
- * Returns the source form which is the form from which the animation is starting.
- * This may be null for the first form in the application
- *
- * @return the source component
- */
- public final Component getSource(){
- return source;
- }
- /**
- * Optional operation to cleanup the garbage left over by a running transition
- */
- public void cleanup() {
- source = null;
- destination = null;
- }
-
- /**
- * Create a copy of the transition, usually the transition used is a copy.
- *
- * @return new transition instance
- * @deprecated use the version that accepts boolean instead
- */
- public Transition copy() {
- return copy(false);
- }
- /**
- * Create a copy of the transition, usually the transition used is a copy.
- *
- * @param reverse creates a new transition instance with "reverse" behavior useful
- * for signifying "back" operations
- * @return new transition instance
- */
- public Transition copy(boolean reverse) {
- // for compatibility with older transitions
- return copy();
- }
-
- /**
- * Allows setting the source form to null to save memory if the transition doesn't need
- * it in memory.
- */
- protected final void cleanSource() {
- source = null;
- }
-
- /**
- * @inheritDoc
- */
- public abstract boolean animate();
-
- /**
- * @inheritDoc
- */
- public abstract void paint(Graphics g);
- }