package com.bottomsheetbehavior;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.os.Build;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.annotation.NonNull;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.CoordinatorLayout;
import android.support.v4.content.ContextCompat;
import android.support.v4.widget.NestedScrollView;
import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewOutlineProvider;
import android.view.ViewPropertyAnimator;
import android.view.Window;
import android.widget.FrameLayout;
import android.widget.TextView;
import com.facebook.react.uimanager.ThemedReactContext;
import com.facebook.react.views.view.ReactViewGroup;
import java.lang.ref.WeakReference;
/**
~ 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.
~
~ https://github.com/miguelhincapie/CustomBottomSheetBehavior
*/
/**
* This behavior should be applied on an AppBarLayout...
* Original from https://github.com/miguelhincapie/CustomBottomSheetBehavior/blob/master/app/src/main/java/co/com/parsoniisolutions/custombottomsheetbehavior/lib/MergedAppBarLayoutBehavior.java
*/
public class MergedAppBarLayoutBehavior extends AppBarLayout.ScrollingViewBehavior {
private static final String TAG = MergedAppBarLayoutBehavior.class.getSimpleName();
private boolean mInit = false;
private FrameLayout.LayoutParams mBackGroundLayoutParams;
private Context mContext;
/**
* To avoid using multiple "peekheight=" in XML and looking flexibility allowing {@link RNBottomSheetBehavior#mPeekHeight}
* get changed dynamically we get the {@link NestedScrollView} that has
* "app:layout_behavior=" {@link RNBottomSheetBehavior} inside the {@link CoordinatorLayout}
*/
private WeakReference<RNBottomSheetBehavior> mBottomSheetBehaviorRef;
private float mInitialY;
private boolean mVisible = false;
private Toolbar mToolbar;
private View mTitleTextView;
private View mBackground;
private int mBackgroundColor;
private int mStatusBarColor;
private int mBarStyle;
private int mBarStyleTransparent;
private ValueAnimator mTitleAlphaValueAnimator;
private int mCurrentTitleAlpha = 0;
public MergedAppBarLayoutBehavior(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
if (dependency instanceof NestedScrollView) {
try {
RNBottomSheetBehavior.from(dependency);
return true;
}
catch (IllegalArgumentException e){}
}
return false;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
if (!mInit) {
init(parent, child);
}
/**
* Following docs we should return true if the Behavior changed the child view's size or position, false otherwise
*/
boolean childMoved = false;
if(isDependencyYBelowAnchorPoint(parent, dependency)){
childMoved = setToolbarVisible(false,child);
}else if(isDependencyYBetweenAnchorPointAndToolbar(parent, child,dependency)){
childMoved = setToolbarVisible(true,child);
setFullBackGroundColor(android.R.color.transparent);
setPartialBackGroundHeight(0);
} else if(isDependencyYBelowToolbar(child, dependency) && ! isDependencyYReachTop(dependency)){
childMoved = setToolbarVisible(true,child);
if(isStatusBarVisible())
setStatusBarBackgroundVisible(false);
if(isTitleVisible())
setTitleVisible(false);
setFullBackGroundColor(android.R.color.transparent);
setPartialBackGroundHeight((int)((child.getHeight() + child.getY()) - dependency.getY()));
} else if(isDependencyYBelowStatusToolbar(child, dependency) || isDependencyYReachTop(dependency)){
childMoved = setToolbarVisible(true,child);
if(!isStatusBarVisible())
setStatusBarBackgroundVisible(true);
if(!isTitleVisible())
setTitleVisible(true);
setFullBackGroundColor(mBackgroundColor);
setPartialBackGroundHeight(0);
}
return childMoved;
}
private void init(@NonNull CoordinatorLayout parent, @NonNull View child){
AppBarLayout appBarLayout = (AppBarLayout) child;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
appBarLayout.setOutlineProvider(ViewOutlineProvider.BACKGROUND);
}
if (mToolbar == null || mBackground == null) {
return;
}
mBackGroundLayoutParams = (FrameLayout.LayoutParams) mBackground.getLayoutParams();
getBottomSheetBehavior(parent);
mTitleTextView = findTitleTextView(mToolbar);
if (mTitleTextView == null)
return;
mInitialY = child.getY();
child.setVisibility(mVisible ? View.VISIBLE : View.INVISIBLE);
setFullBackGroundColor(mVisible && mCurrentTitleAlpha == 1 ? mBackgroundColor : android.R.color.transparent);
setPartialBackGroundHeight(0);
mTitleTextView.setAlpha(mCurrentTitleAlpha);
mInit = true;
setToolbarVisible(false,child);
}
/**
* Look into the CoordiantorLayout for the {@link RNBottomSheetBehavior}
* @param coordinatorLayout with app:layout_behavior= {@link RNBottomSheetBehavior}
*/
private void getBottomSheetBehavior(@NonNull CoordinatorLayout coordinatorLayout) {
for (int i = 0; i < coordinatorLayout.getChildCount(); i++) {
View child = coordinatorLayout.getChildAt(i);
if (child instanceof NestedScrollView) {
try {
RNBottomSheetBehavior temp = RNBottomSheetBehavior.from(child);
mBottomSheetBehaviorRef = new WeakReference<>(temp);
break;
}
catch (IllegalArgumentException e){}
}
}
}
private boolean isDependencyYBelowAnchorPoint(@NonNull CoordinatorLayout parent, @NonNull View dependency){
if (mBottomSheetBehaviorRef == null || mBottomSheetBehaviorRef.get() == null)
getBottomSheetBehavior(parent);
return dependency.getY() > mBottomSheetBehaviorRef.get().getAnchorPoint();
}
private boolean isDependencyYBetweenAnchorPointAndToolbar(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency){
if (mBottomSheetBehaviorRef == null || mBottomSheetBehaviorRef.get() == null)
getBottomSheetBehavior(parent);
return dependency.getY() <= mBottomSheetBehaviorRef.get().getAnchorPoint() && dependency.getY() > child.getY() + child.getHeight();
}
private boolean isDependencyYBelowToolbar(@NonNull View child, @NonNull View dependency){
return dependency.getY() <= child.getY() + child.getHeight() && dependency.getY() > child.getY();
}
private boolean isDependencyYBelowStatusToolbar(@NonNull View child, @NonNull View dependency){
return dependency.getY() <= child.getY();
}
private boolean isDependencyYReachTop(@NonNull View dependency){
return dependency.getY() == 0;
}
private void setPartialBackGroundHeight(int height){
if (mBackGroundLayoutParams != null) {
mBackGroundLayoutParams.height = height;
mBackground.setLayoutParams(mBackGroundLayoutParams);
}
}
public int getFullbackGroundColor() {
if (mToolbar != null) {
ColorDrawable drawable = (ColorDrawable) mToolbar.getBackground();
if (drawable != null) {
return drawable.getColor();
}
}
return 0;
}
public void setFullBackGroundColor(int colorRes){
if (mToolbar != null) {
mToolbar.setBackgroundColor(colorRes);
}
}
private View findTitleTextView(Toolbar toolbar){
for (int i = 0; i < toolbar.getChildCount(); i++) {
View toolBarChild = toolbar.getChildAt(i);
if (toolBarChild instanceof TextView ||
toolBarChild instanceof ReactViewGroup) {
return toolBarChild;
}
}
return null;
}
private boolean setToolbarVisible(boolean visible, final View child){
ViewPropertyAnimator mAppBarLayoutAnimation;
boolean childMoved = false;
if(visible && !mVisible){
childMoved = true;
child.setY(-child.getHeight()/3);
mAppBarLayoutAnimation = child.animate().setDuration(mContext.getResources().getInteger(android.R.integer.config_shortAnimTime));
mAppBarLayoutAnimation.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
child.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
mVisible = true;
}
});
mAppBarLayoutAnimation.alpha(1).y(mInitialY).start();
}else if(!visible && mVisible){
mAppBarLayoutAnimation = child.animate().setDuration(mContext.getResources().getInteger(android.R.integer.config_shortAnimTime));
mAppBarLayoutAnimation.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
child.setVisibility(View.INVISIBLE);
}
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
mVisible = false;
}
});
mAppBarLayoutAnimation.alpha(0).start();
}
return childMoved;
}
private boolean isTitleVisible(){
if (mTitleTextView != null) {
return mTitleTextView.getAlpha() == 1;
}
return false;
}
private void setTitleVisible(boolean visible){
if (mTitleTextView != null && mToolbar != null) {
if ((visible && mTitleTextView.getAlpha() == 1) ||
(!visible && mTitleTextView.getAlpha() == 0))
return;
if (mTitleAlphaValueAnimator == null || !mTitleAlphaValueAnimator.isRunning()) {
int startAlpha = visible ? 0 : 1;
int endAlpha = mCurrentTitleAlpha = visible ? 1 : 0;
mTitleAlphaValueAnimator = ValueAnimator.ofFloat(startAlpha, endAlpha);
mTitleAlphaValueAnimator.setDuration(mContext.getResources().getInteger(android.R.integer.config_shortAnimTime));
mTitleAlphaValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mTitleTextView.setAlpha((Float) animation.getAnimatedValue());
}
});
mTitleAlphaValueAnimator.start();
}
}
}
private boolean isStatusBarVisible(){
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
return ((ThemedReactContext)mContext).getCurrentActivity().getWindow().getStatusBarColor() !=
ContextCompat.getColor(mContext, android.R.color.transparent);
}
return true;
}
public void setStatusBarBackgroundVisible(boolean visible){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && mStatusBarColor != 0){
if(visible){
Window window = ((ThemedReactContext) mContext).getCurrentActivity().getWindow();
window.getDecorView().setSystemUiVisibility(mBarStyle);
window.setStatusBarColor(mStatusBarColor);
}else {
Window window = ((ThemedReactContext) mContext).getCurrentActivity().getWindow();
window.getDecorView().setSystemUiVisibility(mBarStyleTransparent);
window.setStatusBarColor(ContextCompat.getColor(mContext,android.R.color.transparent));
}
}
}
public void setToolbar(Toolbar toolbar) {
mToolbar = toolbar;
}
public void setMergedView(View view) {
mBackground = view;
}
public void setBackgroundColor(int color) {
mBackgroundColor = color;
}
public void setStatusBarColor(int color) {
mStatusBarColor = color;
}
public void setBarStyle(int barStyle) {
mBarStyle = barStyle;
}
public void setBarStyleTransparent(int barStyle) {
mBarStyleTransparent = barStyle;
}
@Override
public Parcelable onSaveInstanceState(CoordinatorLayout parent, View child) {
return new SavedState(super.onSaveInstanceState(parent, child), mVisible, mCurrentTitleAlpha);
}
@Override
public void onRestoreInstanceState(CoordinatorLayout parent, View child, Parcelable state) {
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(parent, child, ss.getSuperState());
this.mVisible = ss.mVisible;
this.mCurrentTitleAlpha = ss.mTitleAlpha;
}
protected static class SavedState extends View.BaseSavedState {
final boolean mVisible;
final int mTitleAlpha;
public SavedState(Parcel source) {
super(source);
mVisible = source.readByte() != 0;
mTitleAlpha = source.readInt();
}
public SavedState(Parcelable superState, boolean visible, int titleAlpha) {
super(superState);
this.mVisible = visible;
this.mTitleAlpha = titleAlpha;
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeByte((byte) (mVisible ? 1 : 0));
out.writeInt(mTitleAlpha);
}
public static final Parcelable.Creator<SavedState> CREATOR =
new Parcelable.Creator<SavedState>() {
@Override
public SavedState createFromParcel(Parcel source) {
return new SavedState(source);
}
@Override
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
public static <V extends View> MergedAppBarLayoutBehavior from(V view) {
ViewGroup.LayoutParams params = view.getLayoutParams();
if (!(params instanceof CoordinatorLayout.LayoutParams)) {
throw new IllegalArgumentException("The view is not a child of CoordinatorLayout");
}
CoordinatorLayout.Behavior behavior = ((CoordinatorLayout.LayoutParams) params)
.getBehavior();
if (!(behavior instanceof MergedAppBarLayoutBehavior)) {
throw new IllegalArgumentException("The view is not associated with " +
"MergedAppBarLayoutBehavior");
}
return (MergedAppBarLayoutBehavior) behavior;
}
}
