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      1 /*
      2  * Copyright (C) 2014 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 
     17 package android.transition;
     18 
     19 import android.animation.Animator;
     20 import android.animation.AnimatorSet;
     21 import android.animation.TypeEvaluator;
     22 import android.graphics.Bitmap;
     23 import android.graphics.Canvas;
     24 import android.graphics.Matrix;
     25 import android.graphics.Rect;
     26 import android.graphics.RectF;
     27 import android.graphics.drawable.BitmapDrawable;
     28 import android.graphics.drawable.Drawable;
     29 import android.view.View;
     30 import android.view.ViewGroup;
     31 import android.widget.ImageView;
     32 
     33 /**
     34  * Static utility methods for Transitions.
     35  *
     36  * @hide
     37  */
     38 public class TransitionUtils {
     39     private static int MAX_IMAGE_SIZE = (1024 * 1024);
     40 
     41     static Animator mergeAnimators(Animator animator1, Animator animator2) {
     42         if (animator1 == null) {
     43             return animator2;
     44         } else if (animator2 == null) {
     45             return animator1;
     46         } else {
     47             AnimatorSet animatorSet = new AnimatorSet();
     48             animatorSet.playTogether(animator1, animator2);
     49             return animatorSet;
     50         }
     51     }
     52 
     53     public static Transition mergeTransitions(Transition... transitions) {
     54         int count = 0;
     55         int nonNullIndex = -1;
     56         for (int i = 0; i < transitions.length; i++) {
     57             if (transitions[i] != null) {
     58                 count++;
     59                 nonNullIndex = i;
     60             }
     61         }
     62 
     63         if (count == 0) {
     64             return null;
     65         }
     66 
     67         if (count == 1) {
     68             return transitions[nonNullIndex];
     69         }
     70 
     71         TransitionSet transitionSet = new TransitionSet();
     72         for (int i = 0; i < transitions.length; i++) {
     73             if (transitions[i] != null) {
     74                 transitionSet.addTransition(transitions[i]);
     75             }
     76         }
     77         return transitionSet;
     78     }
     79 
     80     /**
     81      * Creates a View using the bitmap copy of <code>view</code>. If <code>view</code> is large,
     82      * the copy will use a scaled bitmap of the given view.
     83      *
     84      * @param sceneRoot The ViewGroup in which the view copy will be displayed.
     85      * @param view The view to create a copy of.
     86      * @param parent The parent of view.
     87      */
     88     public static View copyViewImage(ViewGroup sceneRoot, View view, View parent) {
     89         Matrix matrix = new Matrix();
     90         matrix.setTranslate(-parent.getScrollX(), -parent.getScrollY());
     91         view.transformMatrixToGlobal(matrix);
     92         sceneRoot.transformMatrixToLocal(matrix);
     93         RectF bounds = new RectF(0, 0, view.getWidth(), view.getHeight());
     94         matrix.mapRect(bounds);
     95         int left = Math.round(bounds.left);
     96         int top = Math.round(bounds.top);
     97         int right = Math.round(bounds.right);
     98         int bottom = Math.round(bounds.bottom);
     99 
    100         ImageView copy = new ImageView(view.getContext());
    101         copy.setScaleType(ImageView.ScaleType.CENTER_CROP);
    102         Bitmap bitmap = createViewBitmap(view, matrix, bounds);
    103         if (bitmap != null) {
    104             copy.setImageBitmap(bitmap);
    105         }
    106         int widthSpec = View.MeasureSpec.makeMeasureSpec(right - left, View.MeasureSpec.EXACTLY);
    107         int heightSpec = View.MeasureSpec.makeMeasureSpec(bottom - top, View.MeasureSpec.EXACTLY);
    108         copy.measure(widthSpec, heightSpec);
    109         copy.layout(left, top, right, bottom);
    110         return copy;
    111     }
    112 
    113     /**
    114      * Get a copy of bitmap of given drawable, return null if intrinsic size is zero
    115      */
    116     public static Bitmap createDrawableBitmap(Drawable drawable) {
    117         int width = drawable.getIntrinsicWidth();
    118         int height = drawable.getIntrinsicHeight();
    119         if (width <= 0 || height <= 0) {
    120             return null;
    121         }
    122         float scale = Math.min(1f, ((float)MAX_IMAGE_SIZE) / (width * height));
    123         if (drawable instanceof BitmapDrawable && scale == 1f) {
    124             // return same bitmap if scale down not needed
    125             return ((BitmapDrawable) drawable).getBitmap();
    126         }
    127         int bitmapWidth = (int) (width * scale);
    128         int bitmapHeight = (int) (height * scale);
    129         Bitmap bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888);
    130         Canvas canvas = new Canvas(bitmap);
    131         Rect existingBounds = drawable.getBounds();
    132         int left = existingBounds.left;
    133         int top = existingBounds.top;
    134         int right = existingBounds.right;
    135         int bottom = existingBounds.bottom;
    136         drawable.setBounds(0, 0, bitmapWidth, bitmapHeight);
    137         drawable.draw(canvas);
    138         drawable.setBounds(left, top, right, bottom);
    139         return bitmap;
    140     }
    141 
    142     /**
    143      * Creates a Bitmap of the given view, using the Matrix matrix to transform to the local
    144      * coordinates. <code>matrix</code> will be modified during the bitmap creation.
    145      *
    146      * <p>If the bitmap is large, it will be scaled uniformly down to at most 1MB size.</p>
    147      * @param view The view to create a bitmap for.
    148      * @param matrix The matrix converting the view local coordinates to the coordinates that
    149      *               the bitmap will be displayed in. <code>matrix</code> will be modified before
    150      *               returning.
    151      * @param bounds The bounds of the bitmap in the destination coordinate system (where the
    152      *               view should be presented. Typically, this is matrix.mapRect(viewBounds);
    153      * @return A bitmap of the given view or null if bounds has no width or height.
    154      */
    155     public static Bitmap createViewBitmap(View view, Matrix matrix, RectF bounds) {
    156         Bitmap bitmap = null;
    157         int bitmapWidth = Math.round(bounds.width());
    158         int bitmapHeight = Math.round(bounds.height());
    159         if (bitmapWidth > 0 && bitmapHeight > 0) {
    160             float scale = Math.min(1f, ((float)MAX_IMAGE_SIZE) / (bitmapWidth * bitmapHeight));
    161             bitmapWidth *= scale;
    162             bitmapHeight *= scale;
    163             matrix.postTranslate(-bounds.left, -bounds.top);
    164             matrix.postScale(scale, scale);
    165             bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888);
    166             Canvas canvas = new Canvas(bitmap);
    167             canvas.concat(matrix);
    168             view.draw(canvas);
    169         }
    170         return bitmap;
    171     }
    172 
    173     public static class MatrixEvaluator implements TypeEvaluator<Matrix> {
    174 
    175         float[] mTempStartValues = new float[9];
    176 
    177         float[] mTempEndValues = new float[9];
    178 
    179         Matrix mTempMatrix = new Matrix();
    180 
    181         @Override
    182         public Matrix evaluate(float fraction, Matrix startValue, Matrix endValue) {
    183             startValue.getValues(mTempStartValues);
    184             endValue.getValues(mTempEndValues);
    185             for (int i = 0; i < 9; i++) {
    186                 float diff = mTempEndValues[i] - mTempStartValues[i];
    187                 mTempEndValues[i] = mTempStartValues[i] + (fraction * diff);
    188             }
    189             mTempMatrix.setValues(mTempEndValues);
    190             return mTempMatrix;
    191         }
    192     }
    193 }
    194