package com.bottomsheetbehavior;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.content.Context;
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.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import com.facebook.react.uimanager.ThemedReactContext;
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
*/
/**
*
*/
public class ScrollingAppBarLayoutBehavior extends AppBarLayout.ScrollingViewBehavior {
private static final String TAG = ScrollingAppBarLayoutBehavior.class.getSimpleName();
private boolean mInit = false;
private Context mContext;
private boolean mVisible = true;
private int mStatusBarColor;
private int mBarStyle;
private int mBarStyleTransparent;
/**
* 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 ValueAnimator mAppBarYValueAnimator;
public ScrollingAppBarLayoutBehavior(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) {
return init(parent, child, dependency);
}
if (mBottomSheetBehaviorRef == null || mBottomSheetBehaviorRef.get() == null)
getBottomSheetBehavior(parent);
setAppBarVisible((AppBarLayout)child,dependency.getY() >= dependency.getHeight() - mBottomSheetBehaviorRef.get().getPeekHeight());
return true;
}
@Override
public Parcelable onSaveInstanceState(CoordinatorLayout parent, View child) {
return new SavedState(super.onSaveInstanceState(parent, child), mVisible);
}
@Override
public void onRestoreInstanceState(CoordinatorLayout parent, View child, Parcelable state) {
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(parent, child, ss.getSuperState());
this.mVisible = ss.mVisible;
}
private boolean init(CoordinatorLayout parent, View child, View dependency) {
/**
* First we need to know if dependency view is upper or lower compared with
* {@link BottomSheetBehaviorGoogleMapsLike#getPeekHeight()} Y position to know if need to show the AppBar at beginning.
*/
getBottomSheetBehavior(parent);
if (mBottomSheetBehaviorRef == null || mBottomSheetBehaviorRef.get() == null)
getBottomSheetBehavior(parent);
int mCollapsedY = dependency.getHeight() - mBottomSheetBehaviorRef.get().getPeekHeight();
mVisible = (dependency.getY() >= mCollapsedY);
setStatusBarBackgroundVisible(mVisible);
if(!mVisible) child.setY((int) child.getY() - child.getHeight() - getStatusBarHeight());
mInit = true;
/**
* Following {@link #onDependentViewChanged} docs, we need to return true if the
* Behavior changed the child view's size or position, false otherwise.
* In our case we only move it if mVisible got false in this method.
*/
return !mVisible;
}
public void setAppBarVisible(final AppBarLayout appBarLayout, final boolean visible){
if(visible == mVisible)
return;
if(mAppBarYValueAnimator == null || !mAppBarYValueAnimator.isRunning()){
mAppBarYValueAnimator = ValueAnimator.ofFloat(
(int) appBarLayout.getY(),
visible ? (int) appBarLayout.getY() + appBarLayout.getHeight() + getStatusBarHeight() :
(int) appBarLayout.getY() - appBarLayout.getHeight() - getStatusBarHeight());
mAppBarYValueAnimator.setDuration(mContext.getResources().getInteger(android.R.integer.config_shortAnimTime));
mAppBarYValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
appBarLayout.setY((Float) animation.getAnimatedValue());
}
});
mAppBarYValueAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
if(visible)
setStatusBarBackgroundVisible(true);
}
@Override
public void onAnimationEnd(Animator animation) {
if(!visible)
setStatusBarBackgroundVisible(false);
mVisible = visible;
super.onAnimationEnd(animation);
}
});
mAppBarYValueAnimator.start();
}
}
private int getStatusBarHeight() {
int result = 0;
int resourceId = mContext.getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = mContext.getResources().getDimensionPixelSize(resourceId);
}
return result;
}
public void setStatusBarColor(int color) {
mStatusBarColor = color;
}
public void setBarStyle(int barStyle) {
mBarStyle = barStyle;
}
public void setBarStyleTransparent(int barStyle) {
mBarStyleTransparent = barStyle;
}
private 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));
}
}
}
/**
* 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){}
}
}
}
protected static class SavedState extends View.BaseSavedState {
final boolean mVisible;
public SavedState(Parcel source) {
super(source);
mVisible = source.readByte() != 0;
}
public SavedState(Parcelable superState, boolean visible) {
super(superState);
this.mVisible = visible;
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeByte((byte) (mVisible ? 1 : 0));
}
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> ScrollingAppBarLayoutBehavior 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 ScrollingAppBarLayoutBehavior)) {
throw new IllegalArgumentException("The view is not associated with " +
"MergedAppBarLayoutBehavior");
}
return (ScrollingAppBarLayoutBehavior) behavior;
}
}
