package com.marshalchen.common.uimodule.panningview;
import android.content.res.Configuration;
import android.graphics.Matrix;
import android.graphics.RectF;
import android.util.Log;
import android.view.ViewTreeObserver;
import android.view.animation.LinearInterpolator;
import android.widget.ImageView;
import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.AnimatorListenerAdapter;
import com.nineoldandroids.animation.ValueAnimator;
import java.lang.ref.WeakReference;
/**
* Created by f.laurent on 25/07/13.
*/
public class PanningViewAttacher implements ViewTreeObserver.OnGlobalLayoutListener {
public static final int DEFAULT_PANNING_DURATION_IN_MS = 5000;
private static final String TAG = "PanningViewAttacher";
private enum Way {R2L, L2R, T2B, B2T};
private WeakReference<ImageView> mImageView;
private int mIvTop, mIvRight, mIvBottom, mIvLeft;
private ViewTreeObserver mViewTreeObserver;
private Matrix mMatrix;
private RectF mDisplayRect = new RectF();
private ValueAnimator mCurrentAnimator;
private LinearInterpolator mLinearInterpolator;
private boolean mIsPortrait;
private long mDuration;
private long mCurrentPlayTime;
private long mTotalTime;
private Way mWay;
private boolean mIsPanning;
public PanningViewAttacher(ImageView imageView, long duration) {
if(imageView == null) {
throw new IllegalArgumentException("imageView must not be null");
}
if(!hasDrawable(imageView)) {
throw new IllegalArgumentException("drawable must not be null");
}
mLinearInterpolator = new LinearInterpolator();
mDuration = duration;
mImageView = new WeakReference<ImageView>(imageView);
mViewTreeObserver = imageView.getViewTreeObserver();
mViewTreeObserver.addOnGlobalLayoutListener(this);
setImageViewScaleTypeMatrix(imageView);
mMatrix = imageView.getImageMatrix();
if(mMatrix == null) {
mMatrix = new Matrix();
}
mIsPortrait = imageView.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT;
update();
}
/**
*
*/
public void update() {
mWay = null;
mTotalTime = 0;
mCurrentPlayTime = 0;
getImageView().post(new Runnable() {
@Override
public void run() {
scale();
refreshDisplayRect();
}
});
}
public boolean isPanning() {
return mIsPanning;
}
/**
* scale and start to pan the image background
*/
public void startPanning() {
if(mIsPanning) {
return;
}
mIsPanning = true;
final Runnable panningRunnable = new Runnable() {
@Override
public void run() {
animate_();
}
};
getImageView().post(panningRunnable);
}
/**
* stop current panning
*/
public void stopPanning() {
if(!mIsPanning) {
return;
}
mIsPanning = false;
Log.d(TAG, "panning animation stopped by user");
if (mCurrentAnimator != null) {
mCurrentAnimator.removeAllListeners();
mCurrentAnimator.cancel();
mCurrentAnimator = null;
}
mTotalTime += mCurrentPlayTime;
Log.d(TAG, "mTotalTime : " + mTotalTime);
}
/**
* Clean-up the resources attached to this object. This needs to be called
* when the ImageView is no longer used. A good example is from
* {@link android.view.View#onDetachedFromWindow()} or from {@link android.app.Activity#onDestroy()}.
* This is automatically called if you are using {@link PanningView}.
*/
public final void cleanup() {
if (null != mImageView) {
getImageView().getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
mViewTreeObserver = null;
stopPanning();
// Finally, clear ImageView
mImageView = null;
}
public final ImageView getImageView() {
ImageView imageView = null;
if (null != mImageView) {
imageView = mImageView.get();
}
// If we don't have an ImageView, call cleanup()
if (null == imageView) {
cleanup();
throw new IllegalStateException("ImageView no longer exists. You should not use this PanningViewAttacher any more.");
}
return imageView;
}
private int getDrawableIntrinsicHeight() {
return getImageView().getDrawable().getIntrinsicHeight();
}
private int getDrawableIntrinsicWidth() {
return getImageView().getDrawable().getIntrinsicWidth();
}
private int getImageViewWidth() {
return getImageView().getWidth();
}
private int getImageViewHeight() {
return getImageView().getHeight();
}
/**
* Set's the ImageView's ScaleType to Matrix.
*/
private static void setImageViewScaleTypeMatrix(ImageView imageView) {
if (null != imageView && !(imageView instanceof PanningView)) {
imageView.setScaleType(ImageView.ScaleType.MATRIX);
}
}
/**
* @return true if the ImageView exists, and it's Drawable exists
*/
private static boolean hasDrawable(ImageView imageView) {
return null != imageView && null != imageView.getDrawable();
}
@Override
public void onGlobalLayout() {
ImageView imageView = getImageView();
if (null != imageView) {
final int top = imageView.getTop();
final int right = imageView.getRight();
final int bottom = imageView.getBottom();
final int left = imageView.getLeft();
/**
* We need to check whether the ImageView's bounds have changed.
* This would be easier if we targeted API 11+ as we could just use
* View.OnLayoutChangeListener. Instead we have to replicate the
* work, keeping track of the ImageView's bounds and then checking
* if the values change.
*/
if (top != mIvTop || bottom != mIvBottom || left != mIvLeft || right != mIvRight) {
update();
// Update values as something has changed
mIvTop = top;
mIvRight = right;
mIvBottom = bottom;
mIvLeft = left;
}
}
}
private void animate_() {
refreshDisplayRect();
if(mWay == null) {
mWay = mIsPortrait ? Way.R2L : Way.B2T;
}
Log.d(TAG, "mWay : " + mWay);
Log.d(TAG, "mDisplayRect : " + mDisplayRect);
long remainingDuration = mDuration - mTotalTime;
if(mIsPortrait) {
if(mWay == Way.R2L) {
animate(mDisplayRect.left, mDisplayRect.left - (mDisplayRect.right - getImageViewWidth()), remainingDuration);
} else {
animate(mDisplayRect.left, 0.0f, remainingDuration);
}
} else {
if(mWay == Way.B2T) {
animate(mDisplayRect.top, mDisplayRect.top - (mDisplayRect.bottom - getImageViewHeight()), remainingDuration);
} else {
animate(mDisplayRect.top, 0.0f, remainingDuration);
}
}
}
private void changeWay() {
if(mWay == Way.R2L) {
mWay = Way.L2R;
} else if(mWay == Way.L2R) {
mWay = Way.R2L;
} else if(mWay == Way.T2B) {
mWay = Way.B2T;
} else if(mWay == Way.B2T) {
mWay = Way.T2B;
}
mCurrentPlayTime = 0;
mTotalTime = 0;
}
private void animate(float start, float end, long duration) {
Log.d(TAG, "startPanning : " + start + " to " + end + ", in " + duration + "ms");
mCurrentAnimator = ValueAnimator.ofFloat(start, end);
mCurrentAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float value = (Float) animation.getAnimatedValue();
mMatrix.reset();
applyScaleOnMatrix();
if(mIsPortrait) {
mMatrix.postTranslate(value, 0);
} else {
mMatrix.postTranslate(0, value);
}
refreshDisplayRect();
mCurrentPlayTime = animation.getCurrentPlayTime();
setCurrentImageMatrix();
}
});
mCurrentAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
Log.d(TAG, "animation has finished, startPanning in the other way");
changeWay();
animate_();
}
@Override
public void onAnimationCancel(Animator animation) {
Log.d(TAG, "panning animation canceled");
}
});
mCurrentAnimator.setDuration(duration);
mCurrentAnimator.setInterpolator(mLinearInterpolator);
mCurrentAnimator.start();
}
private void setCurrentImageMatrix() {
getImageView().setImageMatrix(mMatrix);
getImageView().invalidate();
getImageView().requestLayout();
}
private void refreshDisplayRect() {
mDisplayRect.set(0, 0, getDrawableIntrinsicWidth(), getDrawableIntrinsicHeight());
mMatrix.mapRect(mDisplayRect);
}
private void scale() {
mMatrix.reset();
applyScaleOnMatrix();
setCurrentImageMatrix();
}
private void applyScaleOnMatrix() {
int drawableSize = mIsPortrait ? getDrawableIntrinsicHeight() : getDrawableIntrinsicWidth();
int imageViewSize = mIsPortrait ? getImageViewHeight() : getImageViewWidth();
float scaleFactor = (float)imageViewSize / (float)drawableSize;
mMatrix.postScale(scaleFactor, scaleFactor);
}
}