| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.transition; |
| |
| import android.animation.Animator; |
| import android.animation.AnimatorListenerAdapter; |
| import android.animation.ObjectAnimator; |
| import android.util.Log; |
| import android.view.View; |
| import android.view.ViewGroup; |
| |
| /** |
| * This transition tracks changes to the visibility of target views in the |
| * start and end scenes and fades views in or out when they become visible |
| * or non-visible. Visibility is determined by both the |
| * {@link View#setVisibility(int)} state of the view as well as whether it |
| * is parented in the current view hierarchy. |
| * |
| * <p>The ability of this transition to fade out a particular view, and the |
| * way that that fading operation takes place, is based on |
| * the situation of the view in the view hierarchy. For example, if a view was |
| * simply removed from its parent, then the view will be added into a {@link |
| * android.view.ViewGroupOverlay} while fading. If a visible view is |
| * changed to be {@link View#GONE} or {@link View#INVISIBLE}, then the |
| * visibility will be changed to {@link View#VISIBLE} for the duration of |
| * the animation. However, if a view is in a hierarchy which is also altering |
| * its visibility, the situation can be more complicated. In general, if a |
| * view that is no longer in the hierarchy in the end scene still has a |
| * parent (so its parent hierarchy was removed, but it was not removed from |
| * its parent), then it will be left alone to avoid side-effects from |
| * improperly removing it from its parent. The only exception to this is if |
| * the previous {@link Scene} was |
| * {@link Scene#getSceneForLayout(android.view.ViewGroup, int, android.content.Context) |
| * created from a layout resource file}, then it is considered safe to un-parent |
| * the starting scene view in order to fade it out.</p> |
| * |
| * <p>A Fade transition can be described in a resource file by using the |
| * tag <code>fade</code>, along with the standard |
| * attributes of {@link android.R.styleable#Fade} and |
| * {@link android.R.styleable#Transition}.</p> |
| |
| */ |
| public class Fade extends Visibility { |
| |
| private static boolean DBG = Transition.DBG && false; |
| |
| private static final String LOG_TAG = "Fade"; |
| private static final String PROPNAME_SCREEN_X = "android:fade:screenX"; |
| private static final String PROPNAME_SCREEN_Y = "android:fade:screenY"; |
| |
| /** |
| * Fading mode used in {@link #Fade(int)} to make the transition |
| * operate on targets that are appearing. Maybe be combined with |
| * {@link #OUT} to fade both in and out. |
| */ |
| public static final int IN = 0x1; |
| /** |
| * Fading mode used in {@link #Fade(int)} to make the transition |
| * operate on targets that are disappearing. Maybe be combined with |
| * {@link #IN} to fade both in and out. |
| */ |
| public static final int OUT = 0x2; |
| |
| private int mFadingMode; |
| |
| /** |
| * Constructs a Fade transition that will fade targets in and out. |
| */ |
| public Fade() { |
| this(IN | OUT); |
| } |
| |
| /** |
| * Constructs a Fade transition that will fade targets in |
| * and/or out, according to the value of fadingMode. |
| * |
| * @param fadingMode The behavior of this transition, a combination of |
| * {@link #IN} and {@link #OUT}. |
| */ |
| public Fade(int fadingMode) { |
| mFadingMode = fadingMode; |
| } |
| |
| /** |
| * Utility method to handle creating and running the Animator. |
| */ |
| private Animator createAnimation(View view, float startAlpha, float endAlpha, |
| AnimatorListenerAdapter listener) { |
| if (startAlpha == endAlpha) { |
| // run listener if we're noop'ing the animation, to get the end-state results now |
| if (listener != null) { |
| listener.onAnimationEnd(null); |
| } |
| return null; |
| } |
| final ObjectAnimator anim = ObjectAnimator.ofFloat(view, "transitionAlpha", startAlpha, |
| endAlpha); |
| if (DBG) { |
| Log.d(LOG_TAG, "Created animator " + anim); |
| } |
| if (listener != null) { |
| anim.addListener(listener); |
| anim.addPauseListener(listener); |
| } |
| return anim; |
| } |
| |
| private void captureValues(TransitionValues transitionValues) { |
| int[] loc = new int[2]; |
| transitionValues.view.getLocationOnScreen(loc); |
| transitionValues.values.put(PROPNAME_SCREEN_X, loc[0]); |
| transitionValues.values.put(PROPNAME_SCREEN_Y, loc[1]); |
| } |
| |
| @Override |
| public void captureStartValues(TransitionValues transitionValues) { |
| super.captureStartValues(transitionValues); |
| captureValues(transitionValues); |
| } |
| |
| @Override |
| public Animator onAppear(ViewGroup sceneRoot, |
| TransitionValues startValues, int startVisibility, |
| TransitionValues endValues, int endVisibility) { |
| if ((mFadingMode & IN) != IN || endValues == null) { |
| return null; |
| } |
| final View endView = endValues.view; |
| if (DBG) { |
| View startView = (startValues != null) ? startValues.view : null; |
| Log.d(LOG_TAG, "Fade.onAppear: startView, startVis, endView, endVis = " + |
| startView + ", " + startVisibility + ", " + endView + ", " + endVisibility); |
| } |
| endView.setTransitionAlpha(0); |
| TransitionListener transitionListener = new TransitionListenerAdapter() { |
| boolean mCanceled = false; |
| float mPausedAlpha; |
| |
| @Override |
| public void onTransitionCancel(Transition transition) { |
| endView.setTransitionAlpha(1); |
| mCanceled = true; |
| } |
| |
| @Override |
| public void onTransitionEnd(Transition transition) { |
| if (!mCanceled) { |
| endView.setTransitionAlpha(1); |
| } |
| } |
| |
| @Override |
| public void onTransitionPause(Transition transition) { |
| mPausedAlpha = endView.getTransitionAlpha(); |
| endView.setTransitionAlpha(1); |
| } |
| |
| @Override |
| public void onTransitionResume(Transition transition) { |
| endView.setTransitionAlpha(mPausedAlpha); |
| } |
| }; |
| addListener(transitionListener); |
| return createAnimation(endView, 0, 1, null); |
| } |
| |
| @Override |
| public Animator onDisappear(ViewGroup sceneRoot, |
| TransitionValues startValues, int startVisibility, |
| TransitionValues endValues, int endVisibility) { |
| if ((mFadingMode & OUT) != OUT) { |
| return null; |
| } |
| View view = null; |
| View startView = (startValues != null) ? startValues.view : null; |
| View endView = (endValues != null) ? endValues.view : null; |
| if (DBG) { |
| Log.d(LOG_TAG, "Fade.onDisappear: startView, startVis, endView, endVis = " + |
| startView + ", " + startVisibility + ", " + endView + ", " + endVisibility); |
| } |
| View overlayView = null; |
| View viewToKeep = null; |
| if (endView == null || endView.getParent() == null) { |
| if (endView != null) { |
| // endView was removed from its parent - add it to the overlay |
| view = overlayView = endView; |
| } else if (startView != null) { |
| // endView does not exist. Use startView only under certain |
| // conditions, because placing a view in an overlay necessitates |
| // it being removed from its current parent |
| if (startView.getParent() == null) { |
| // no parent - safe to use |
| view = overlayView = startView; |
| } else if (startView.getParent() instanceof View && |
| startView.getParent().getParent() == null) { |
| View startParent = (View) startView.getParent(); |
| int id = startParent.getId(); |
| if (id != View.NO_ID && sceneRoot.findViewById(id) != null && mCanRemoveViews) { |
| // no parent, but its parent is unparented but the parent |
| // hierarchy has been replaced by a new hierarchy with the same id |
| // and it is safe to un-parent startView |
| view = overlayView = startView; |
| } |
| } |
| } |
| } else { |
| // visibility change |
| if (endVisibility == View.INVISIBLE) { |
| view = endView; |
| viewToKeep = view; |
| } else { |
| // Becoming GONE |
| if (startView == endView) { |
| view = endView; |
| viewToKeep = view; |
| } else { |
| view = startView; |
| overlayView = view; |
| } |
| } |
| } |
| final int finalVisibility = endVisibility; |
| // TODO: add automatic facility to Visibility superclass for keeping views around |
| if (overlayView != null) { |
| // TODO: Need to do this for general case of adding to overlay |
| int screenX = (Integer) startValues.values.get(PROPNAME_SCREEN_X); |
| int screenY = (Integer) startValues.values.get(PROPNAME_SCREEN_Y); |
| int[] loc = new int[2]; |
| sceneRoot.getLocationOnScreen(loc); |
| overlayView.offsetLeftAndRight((screenX - loc[0]) - overlayView.getLeft()); |
| overlayView.offsetTopAndBottom((screenY - loc[1]) - overlayView.getTop()); |
| sceneRoot.getOverlay().add(overlayView); |
| // TODO: add automatic facility to Visibility superclass for keeping views around |
| final float startAlpha = 1; |
| float endAlpha = 0; |
| final View finalView = view; |
| final View finalOverlayView = overlayView; |
| final View finalViewToKeep = viewToKeep; |
| final ViewGroup finalSceneRoot = sceneRoot; |
| final AnimatorListenerAdapter endListener = new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| finalView.setTransitionAlpha(startAlpha); |
| // TODO: restore view offset from overlay repositioning |
| if (finalViewToKeep != null) { |
| finalViewToKeep.setVisibility(finalVisibility); |
| } |
| if (finalOverlayView != null) { |
| finalSceneRoot.getOverlay().remove(finalOverlayView); |
| } |
| } |
| |
| @Override |
| public void onAnimationPause(Animator animation) { |
| if (finalOverlayView != null) { |
| finalSceneRoot.getOverlay().remove(finalOverlayView); |
| } |
| } |
| |
| @Override |
| public void onAnimationResume(Animator animation) { |
| if (finalOverlayView != null) { |
| finalSceneRoot.getOverlay().add(finalOverlayView); |
| } |
| } |
| }; |
| return createAnimation(view, startAlpha, endAlpha, endListener); |
| } |
| if (viewToKeep != null) { |
| // TODO: find a different way to do this, like just changing the view to be |
| // VISIBLE for the duration of the transition |
| viewToKeep.setVisibility((View.VISIBLE)); |
| // TODO: add automatic facility to Visibility superclass for keeping views around |
| final float startAlpha = 1; |
| float endAlpha = 0; |
| final View finalView = view; |
| final View finalOverlayView = overlayView; |
| final View finalViewToKeep = viewToKeep; |
| final ViewGroup finalSceneRoot = sceneRoot; |
| final AnimatorListenerAdapter endListener = new AnimatorListenerAdapter() { |
| boolean mCanceled = false; |
| float mPausedAlpha = -1; |
| |
| @Override |
| public void onAnimationPause(Animator animation) { |
| if (finalViewToKeep != null && !mCanceled) { |
| finalViewToKeep.setVisibility(finalVisibility); |
| } |
| mPausedAlpha = finalView.getTransitionAlpha(); |
| finalView.setTransitionAlpha(startAlpha); |
| } |
| |
| @Override |
| public void onAnimationResume(Animator animation) { |
| if (finalViewToKeep != null && !mCanceled) { |
| finalViewToKeep.setVisibility(View.VISIBLE); |
| } |
| finalView.setTransitionAlpha(mPausedAlpha); |
| } |
| |
| @Override |
| public void onAnimationCancel(Animator animation) { |
| mCanceled = true; |
| if (mPausedAlpha >= 0) { |
| finalView.setTransitionAlpha(mPausedAlpha); |
| } |
| } |
| |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| if (!mCanceled) { |
| finalView.setTransitionAlpha(startAlpha); |
| } |
| // TODO: restore view offset from overlay repositioning |
| if (finalViewToKeep != null && !mCanceled) { |
| finalViewToKeep.setVisibility(finalVisibility); |
| } |
| if (finalOverlayView != null) { |
| finalSceneRoot.getOverlay().remove(finalOverlayView); |
| } |
| } |
| }; |
| return createAnimation(view, startAlpha, endAlpha, endListener); |
| } |
| return null; |
| } |
| |
| } |
