1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.gallery3d.anim;
18
19import android.view.animation.AccelerateInterpolator;
20import android.view.animation.DecelerateInterpolator;
21import android.view.animation.Interpolator;
22
23import com.android.gallery3d.glrenderer.GLCanvas;
24import com.android.gallery3d.glrenderer.RawTexture;
25import com.android.gallery3d.ui.GLView;
26import com.android.gallery3d.ui.TiledScreenNail;
27
28public class StateTransitionAnimation extends Animation {
29
30    public static class Spec {
31        public static final Spec OUTGOING;
32        public static final Spec INCOMING;
33        public static final Spec PHOTO_INCOMING;
34
35        private static final Interpolator DEFAULT_INTERPOLATOR =
36                new DecelerateInterpolator();
37
38        public int duration = 330;
39        public float backgroundAlphaFrom = 0;
40        public float backgroundAlphaTo = 0;
41        public float backgroundScaleFrom = 0;
42        public float backgroundScaleTo = 0;
43        public float contentAlphaFrom = 1;
44        public float contentAlphaTo = 1;
45        public float contentScaleFrom = 1;
46        public float contentScaleTo = 1;
47        public float overlayAlphaFrom = 0;
48        public float overlayAlphaTo = 0;
49        public float overlayScaleFrom = 0;
50        public float overlayScaleTo = 0;
51        public Interpolator interpolator = DEFAULT_INTERPOLATOR;
52
53        static {
54            OUTGOING = new Spec();
55            OUTGOING.backgroundAlphaFrom = 0.5f;
56            OUTGOING.backgroundAlphaTo = 0f;
57            OUTGOING.backgroundScaleFrom = 1f;
58            OUTGOING.backgroundScaleTo = 0f;
59            OUTGOING.contentAlphaFrom = 0.5f;
60            OUTGOING.contentAlphaTo = 1f;
61            OUTGOING.contentScaleFrom = 3f;
62            OUTGOING.contentScaleTo = 1f;
63
64            INCOMING = new Spec();
65            INCOMING.overlayAlphaFrom = 1f;
66            INCOMING.overlayAlphaTo = 0f;
67            INCOMING.overlayScaleFrom = 1f;
68            INCOMING.overlayScaleTo = 3f;
69            INCOMING.contentAlphaFrom = 0f;
70            INCOMING.contentAlphaTo = 1f;
71            INCOMING.contentScaleFrom = 0.25f;
72            INCOMING.contentScaleTo = 1f;
73
74            PHOTO_INCOMING = INCOMING;
75        }
76
77        private static Spec specForTransition(Transition t) {
78            switch (t) {
79                case Outgoing:
80                    return Spec.OUTGOING;
81                case Incoming:
82                    return Spec.INCOMING;
83                case PhotoIncoming:
84                    return Spec.PHOTO_INCOMING;
85                case None:
86                default:
87                    return null;
88            }
89        }
90    }
91
92    public static enum Transition { None, Outgoing, Incoming, PhotoIncoming }
93
94    private final Spec mTransitionSpec;
95    private float mCurrentContentScale;
96    private float mCurrentContentAlpha;
97    private float mCurrentBackgroundScale;
98    private float mCurrentBackgroundAlpha;
99    private float mCurrentOverlayScale;
100    private float mCurrentOverlayAlpha;
101    private RawTexture mOldScreenTexture;
102
103    public StateTransitionAnimation(Transition t, RawTexture oldScreen) {
104        this(Spec.specForTransition(t), oldScreen);
105    }
106
107    public StateTransitionAnimation(Spec spec, RawTexture oldScreen) {
108        mTransitionSpec = spec != null ? spec : Spec.OUTGOING;
109        setDuration(mTransitionSpec.duration);
110        setInterpolator(mTransitionSpec.interpolator);
111        mOldScreenTexture = oldScreen;
112        TiledScreenNail.disableDrawPlaceholder();
113    }
114
115    @Override
116    public boolean calculate(long currentTimeMillis) {
117        boolean retval = super.calculate(currentTimeMillis);
118        if (!isActive()) {
119            if (mOldScreenTexture != null) {
120                mOldScreenTexture.recycle();
121                mOldScreenTexture = null;
122            }
123            TiledScreenNail.enableDrawPlaceholder();
124        }
125        return retval;
126    }
127
128    @Override
129    protected void onCalculate(float progress) {
130        mCurrentContentScale = mTransitionSpec.contentScaleFrom
131                + (mTransitionSpec.contentScaleTo - mTransitionSpec.contentScaleFrom) * progress;
132        mCurrentContentAlpha = mTransitionSpec.contentAlphaFrom
133                + (mTransitionSpec.contentAlphaTo - mTransitionSpec.contentAlphaFrom) * progress;
134        mCurrentBackgroundAlpha = mTransitionSpec.backgroundAlphaFrom
135                + (mTransitionSpec.backgroundAlphaTo - mTransitionSpec.backgroundAlphaFrom)
136                * progress;
137        mCurrentBackgroundScale = mTransitionSpec.backgroundScaleFrom
138                + (mTransitionSpec.backgroundScaleTo - mTransitionSpec.backgroundScaleFrom)
139                * progress;
140        mCurrentOverlayScale = mTransitionSpec.overlayScaleFrom
141                + (mTransitionSpec.overlayScaleTo - mTransitionSpec.overlayScaleFrom) * progress;
142        mCurrentOverlayAlpha = mTransitionSpec.overlayAlphaFrom
143                + (mTransitionSpec.overlayAlphaTo - mTransitionSpec.overlayAlphaFrom) * progress;
144    }
145
146    private void applyOldTexture(GLView view, GLCanvas canvas, float alpha, float scale, boolean clear) {
147        if (mOldScreenTexture == null)
148            return;
149        if (clear) canvas.clearBuffer(view.getBackgroundColor());
150        canvas.save();
151        canvas.setAlpha(alpha);
152        int xOffset = view.getWidth() / 2;
153        int yOffset = view.getHeight() / 2;
154        canvas.translate(xOffset, yOffset);
155        canvas.scale(scale, scale, 1);
156        mOldScreenTexture.draw(canvas, -xOffset, -yOffset);
157        canvas.restore();
158    }
159
160    public void applyBackground(GLView view, GLCanvas canvas) {
161        if (mCurrentBackgroundAlpha > 0f) {
162            applyOldTexture(view, canvas, mCurrentBackgroundAlpha, mCurrentBackgroundScale, true);
163        }
164    }
165
166    public void applyContentTransform(GLView view, GLCanvas canvas) {
167        int xOffset = view.getWidth() / 2;
168        int yOffset = view.getHeight() / 2;
169        canvas.translate(xOffset, yOffset);
170        canvas.scale(mCurrentContentScale, mCurrentContentScale, 1);
171        canvas.translate(-xOffset, -yOffset);
172        canvas.setAlpha(mCurrentContentAlpha);
173    }
174
175    public void applyOverlay(GLView view, GLCanvas canvas) {
176        if (mCurrentOverlayAlpha > 0f) {
177            applyOldTexture(view, canvas, mCurrentOverlayAlpha, mCurrentOverlayScale, false);
178        }
179    }
180}
181