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/*
* 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.AnimatorSet;
import android.animation.TypeEvaluator;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Picture;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
/**
* Static utility methods for Transitions.
*
* @hide
*/
public class TransitionUtils {
private static int MAX_IMAGE_SIZE = (1024 * 1024);
static Animator mergeAnimators(Animator animator1, Animator animator2) {
if (animator1 == null) {
return animator2;
} else if (animator2 == null) {
return animator1;
} else {
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.playTogether(animator1, animator2);
return animatorSet;
}
}
public static Transition mergeTransitions(Transition... transitions) {
int count = 0;
int nonNullIndex = -1;
for (int i = 0; i < transitions.length; i++) {
if (transitions[i] != null) {
count++;
nonNullIndex = i;
}
}
if (count == 0) {
return null;
}
if (count == 1) {
return transitions[nonNullIndex];
}
TransitionSet transitionSet = new TransitionSet();
for (int i = 0; i < transitions.length; i++) {
if (transitions[i] != null) {
transitionSet.addTransition(transitions[i]);
}
}
return transitionSet;
}
/**
* Creates a View using the bitmap copy of <code>view</code>. If <code>view</code> is large,
* the copy will use a scaled bitmap of the given view.
*
* @param sceneRoot The ViewGroup in which the view copy will be displayed.
* @param view The view to create a copy of.
* @param parent The parent of view.
*/
public static View copyViewImage(ViewGroup sceneRoot, View view, View parent) {
Matrix matrix = new Matrix();
matrix.setTranslate(-parent.getScrollX(), -parent.getScrollY());
view.transformMatrixToGlobal(matrix);
sceneRoot.transformMatrixToLocal(matrix);
RectF bounds = new RectF(0, 0, view.getWidth(), view.getHeight());
matrix.mapRect(bounds);
int left = Math.round(bounds.left);
int top = Math.round(bounds.top);
int right = Math.round(bounds.right);
int bottom = Math.round(bounds.bottom);
ImageView copy = new ImageView(view.getContext());
copy.setScaleType(ImageView.ScaleType.CENTER_CROP);
Bitmap bitmap = createViewBitmap(view, matrix, bounds, sceneRoot);
if (bitmap != null) {
copy.setImageBitmap(bitmap);
}
int widthSpec = View.MeasureSpec.makeMeasureSpec(right - left, View.MeasureSpec.EXACTLY);
int heightSpec = View.MeasureSpec.makeMeasureSpec(bottom - top, View.MeasureSpec.EXACTLY);
copy.measure(widthSpec, heightSpec);
copy.layout(left, top, right, bottom);
return copy;
}
/**
* Get a copy of bitmap of given drawable, return null if intrinsic size is zero
*/
public static Bitmap createDrawableBitmap(Drawable drawable, View hostView) {
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
if (width <= 0 || height <= 0) {
return null;
}
float scale = Math.min(1f, ((float)MAX_IMAGE_SIZE) / (width * height));
if (drawable instanceof BitmapDrawable && scale == 1f) {
// return same bitmap if scale down not needed
return ((BitmapDrawable) drawable).getBitmap();
}
int bitmapWidth = (int) (width * scale);
int bitmapHeight = (int) (height * scale);
final Picture picture = new Picture();
final Canvas canvas = picture.beginRecording(width, height);
// Do stuff with the canvas
Rect existingBounds = drawable.getBounds();
int left = existingBounds.left;
int top = existingBounds.top;
int right = existingBounds.right;
int bottom = existingBounds.bottom;
drawable.setBounds(0, 0, bitmapWidth, bitmapHeight);
drawable.draw(canvas);
drawable.setBounds(left, top, right, bottom);
picture.endRecording();
return Bitmap.createBitmap(picture);
}
/**
* Creates a Bitmap of the given view, using the Matrix matrix to transform to the local
* coordinates. <code>matrix</code> will be modified during the bitmap creation.
*
* <p>If the bitmap is large, it will be scaled uniformly down to at most 1MB size.</p>
* @param view The view to create a bitmap for.
* @param matrix The matrix converting the view local coordinates to the coordinates that
* the bitmap will be displayed in. <code>matrix</code> will be modified before
* returning.
* @param bounds The bounds of the bitmap in the destination coordinate system (where the
* view should be presented. Typically, this is matrix.mapRect(viewBounds);
* @param sceneRoot A ViewGroup that is attached to the window to temporarily contain the view
* if it isn't attached to the window.
* @return A bitmap of the given view or null if bounds has no width or height.
*/
public static Bitmap createViewBitmap(View view, Matrix matrix, RectF bounds,
ViewGroup sceneRoot) {
final boolean addToOverlay = !view.isAttachedToWindow();
ViewGroup parent = null;
int indexInParent = 0;
if (addToOverlay) {
if (sceneRoot == null || !sceneRoot.isAttachedToWindow()) {
return null;
}
parent = (ViewGroup) view.getParent();
indexInParent = parent.indexOfChild(view);
sceneRoot.getOverlay().add(view);
}
Bitmap bitmap = null;
int bitmapWidth = Math.round(bounds.width());
int bitmapHeight = Math.round(bounds.height());
if (bitmapWidth > 0 && bitmapHeight > 0) {
float scale = Math.min(1f, ((float) MAX_IMAGE_SIZE) / (bitmapWidth * bitmapHeight));
bitmapWidth *= scale;
bitmapHeight *= scale;
matrix.postTranslate(-bounds.left, -bounds.top);
matrix.postScale(scale, scale);
final Picture picture = new Picture();
final Canvas canvas = picture.beginRecording(bitmapWidth, bitmapHeight);
canvas.concat(matrix);
view.draw(canvas);
picture.endRecording();
bitmap = Bitmap.createBitmap(picture);
}
if (addToOverlay) {
sceneRoot.getOverlay().remove(view);
parent.addView(view, indexInParent);
}
return bitmap;
}
public static class MatrixEvaluator implements TypeEvaluator<Matrix> {
float[] mTempStartValues = new float[9];
float[] mTempEndValues = new float[9];
Matrix mTempMatrix = new Matrix();
@Override
public Matrix evaluate(float fraction, Matrix startValue, Matrix endValue) {
startValue.getValues(mTempStartValues);
endValue.getValues(mTempEndValues);
for (int i = 0; i < 9; i++) {
float diff = mTempEndValues[i] - mTempStartValues[i];
mTempEndValues[i] = mTempStartValues[i] + (fraction * diff);
}
mTempMatrix.setValues(mTempEndValues);
return mTempMatrix;
}
}
}
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