File: ChangeImageTransform.java

package info (click to toggle)
android-platform-frameworks-base 1%3A10.0.0%2Br36-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 321,788 kB
  • sloc: java: 962,234; cpp: 274,314; xml: 242,770; python: 5,060; sh: 1,432; ansic: 494; makefile: 47; sed: 19
file content (181 lines) | stat: -rw-r--r-- 6,801 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
/*
 * Copyright (C) 2014 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.ObjectAnimator;
import android.animation.TypeEvaluator;
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Property;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import java.util.Map;

/**
 * This Transition captures an ImageView's matrix before and after the
 * scene change and animates it during the transition.
 *
 * <p>In combination with ChangeBounds, ChangeImageTransform allows ImageViews
 * that change size, shape, or {@link android.widget.ImageView.ScaleType} to animate contents
 * smoothly.</p>
 */
public class ChangeImageTransform extends Transition {

    private static final String TAG = "ChangeImageTransform";

    private static final String PROPNAME_MATRIX = "android:changeImageTransform:matrix";
    private static final String PROPNAME_BOUNDS = "android:changeImageTransform:bounds";

    private static final String[] sTransitionProperties = {
            PROPNAME_MATRIX,
            PROPNAME_BOUNDS,
    };

    private static TypeEvaluator<Matrix> NULL_MATRIX_EVALUATOR = new TypeEvaluator<Matrix>() {
        @Override
        public Matrix evaluate(float fraction, Matrix startValue, Matrix endValue) {
            return null;
        }
    };

    private static Property<ImageView, Matrix> ANIMATED_TRANSFORM_PROPERTY
            = new Property<ImageView, Matrix>(Matrix.class, "animatedTransform") {
        @Override
        public void set(ImageView object, Matrix value) {
            object.animateTransform(value);
        }

        @Override
        public Matrix get(ImageView object) {
            return null;
        }
    };

    public ChangeImageTransform() {}

    public ChangeImageTransform(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    private void captureValues(TransitionValues transitionValues) {
        View view = transitionValues.view;
        if (!(view instanceof ImageView) || view.getVisibility() != View.VISIBLE) {
            return;
        }
        ImageView imageView = (ImageView) view;
        Drawable drawable = imageView.getDrawable();
        if (drawable == null) {
            return;
        }
        Map<String, Object> values = transitionValues.values;

        int left = view.getLeft();
        int top = view.getTop();
        int right = view.getRight();
        int bottom = view.getBottom();

        Rect bounds = new Rect(left, top, right, bottom);
        values.put(PROPNAME_BOUNDS, bounds);
        Matrix matrix;
        ImageView.ScaleType scaleType = imageView.getScaleType();
        int drawableWidth = drawable.getIntrinsicWidth();
        int drawableHeight = drawable.getIntrinsicHeight();
        if (scaleType == ImageView.ScaleType.FIT_XY && drawableWidth > 0 && drawableHeight > 0) {
            float scaleX = ((float) bounds.width()) / drawableWidth;
            float scaleY = ((float) bounds.height()) / drawableHeight;
            matrix = new Matrix();
            matrix.setScale(scaleX, scaleY);
        } else {
            matrix = new Matrix(imageView.getImageMatrix());
        }
        values.put(PROPNAME_MATRIX, matrix);
    }

    @Override
    public void captureStartValues(TransitionValues transitionValues) {
        captureValues(transitionValues);
    }

    @Override
    public void captureEndValues(TransitionValues transitionValues) {
        captureValues(transitionValues);
    }

    @Override
    public String[] getTransitionProperties() {
        return sTransitionProperties;
    }

    /**
     * Creates an Animator for ImageViews moving, changing dimensions, and/or changing
     * {@link android.widget.ImageView.ScaleType}.
     *
     * @param sceneRoot   The root of the transition hierarchy.
     * @param startValues The values for a specific target in the start scene.
     * @param endValues   The values for the target in the end scene.
     * @return An Animator to move an ImageView or null if the View is not an ImageView,
     * the Drawable changed, the View is not VISIBLE, or there was no change.
     */
    @Override
    public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues,
            TransitionValues endValues) {
        if (startValues == null || endValues == null) {
            return null;
        }
        Rect startBounds = (Rect) startValues.values.get(PROPNAME_BOUNDS);
        Rect endBounds = (Rect) endValues.values.get(PROPNAME_BOUNDS);
        Matrix startMatrix = (Matrix) startValues.values.get(PROPNAME_MATRIX);
        Matrix endMatrix = (Matrix) endValues.values.get(PROPNAME_MATRIX);
        if (startBounds == null || endBounds == null || startMatrix == null || endMatrix == null) {
            return null;
        }

        if (startBounds.equals(endBounds) && startMatrix.equals(endMatrix)) {
            return null;
        }

        ImageView imageView = (ImageView) endValues.view;
        Drawable drawable = imageView.getDrawable();
        int drawableWidth = drawable.getIntrinsicWidth();
        int drawableHeight = drawable.getIntrinsicHeight();

        ObjectAnimator animator;
        if (drawableWidth <= 0 || drawableHeight <= 0) {
            animator = createNullAnimator(imageView);
        } else {
            ANIMATED_TRANSFORM_PROPERTY.set(imageView, startMatrix);
            animator = createMatrixAnimator(imageView, startMatrix, endMatrix);
        }
        return animator;
    }

    private ObjectAnimator createNullAnimator(ImageView imageView) {
        return ObjectAnimator.ofObject(imageView, ANIMATED_TRANSFORM_PROPERTY,
                NULL_MATRIX_EVALUATOR, Matrix.IDENTITY_MATRIX, Matrix.IDENTITY_MATRIX);
    }

    private ObjectAnimator createMatrixAnimator(final ImageView imageView, Matrix startMatrix,
            final Matrix endMatrix) {
        return ObjectAnimator.ofObject(imageView, ANIMATED_TRANSFORM_PROPERTY,
                new TransitionUtils.MatrixEvaluator(), startMatrix, endMatrix);
    }
}