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/*
* Copyright (C) 2017 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 com.android.launcher3.allapps;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Point;
import android.graphics.Rect;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import com.android.launcher3.R;
public class FloatingHeaderView extends LinearLayout implements
ValueAnimator.AnimatorUpdateListener {
private final Rect mClip = new Rect(0, 0, Integer.MAX_VALUE, Integer.MAX_VALUE);
private final ValueAnimator mAnimator = ValueAnimator.ofInt(0, 0);
private final Point mTempOffset = new Point();
private final RecyclerView.OnScrollListener mOnScrollListener = new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
}
@Override
public void onScrolled(RecyclerView rv, int dx, int dy) {
if (rv != mCurrentRV) {
return;
}
if (mAnimator.isStarted()) {
mAnimator.cancel();
}
int current = -mCurrentRV.getCurrentScrollY();
moved(current);
apply();
}
};
private ViewGroup mTabLayout;
private AllAppsRecyclerView mMainRV;
private AllAppsRecyclerView mWorkRV;
private AllAppsRecyclerView mCurrentRV;
private ViewGroup mParent;
private boolean mHeaderCollapsed;
private int mSnappedScrolledY;
private int mTranslationY;
private boolean mForwardToRecyclerView;
protected boolean mTabsHidden;
protected int mMaxTranslation;
public FloatingHeaderView(@NonNull Context context) {
this(context, null);
}
public FloatingHeaderView(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
mTabLayout = findViewById(R.id.tabs);
}
public void setup(AllAppsContainerView.AdapterHolder[] mAH, boolean tabsHidden) {
mTabsHidden = tabsHidden;
mTabLayout.setVisibility(tabsHidden ? View.GONE : View.VISIBLE);
mMainRV = setupRV(mMainRV, mAH[AllAppsContainerView.AdapterHolder.MAIN].recyclerView);
mWorkRV = setupRV(mWorkRV, mAH[AllAppsContainerView.AdapterHolder.WORK].recyclerView);
mParent = (ViewGroup) mMainRV.getParent();
setMainActive(true);
reset();
}
private AllAppsRecyclerView setupRV(AllAppsRecyclerView old, AllAppsRecyclerView updated) {
if (old != updated && updated != null ) {
updated.addOnScrollListener(mOnScrollListener);
}
return updated;
}
public void setMainActive(boolean active) {
mCurrentRV = active ? mMainRV : mWorkRV;
}
public int getMaxTranslation() {
if (mMaxTranslation == 0 && mTabsHidden) {
return getResources().getDimensionPixelSize(R.dimen.all_apps_search_bar_bottom_padding);
} else if (mMaxTranslation > 0 && mTabsHidden) {
return mMaxTranslation + getPaddingTop();
} else {
return mMaxTranslation;
}
}
private boolean canSnapAt(int currentScrollY) {
return Math.abs(currentScrollY) <= mMaxTranslation;
}
private void moved(final int currentScrollY) {
if (mHeaderCollapsed) {
if (currentScrollY <= mSnappedScrolledY) {
if (canSnapAt(currentScrollY)) {
mSnappedScrolledY = currentScrollY;
}
} else {
mHeaderCollapsed = false;
}
mTranslationY = currentScrollY;
} else if (!mHeaderCollapsed) {
mTranslationY = currentScrollY - mSnappedScrolledY - mMaxTranslation;
// update state vars
if (mTranslationY >= 0) { // expanded: must not move down further
mTranslationY = 0;
mSnappedScrolledY = currentScrollY - mMaxTranslation;
} else if (mTranslationY <= -mMaxTranslation) { // hide or stay hidden
mHeaderCollapsed = true;
mSnappedScrolledY = -mMaxTranslation;
}
}
}
protected void applyScroll(int uncappedY, int currentY) { }
protected void apply() {
int uncappedTranslationY = mTranslationY;
mTranslationY = Math.max(mTranslationY, -mMaxTranslation);
applyScroll(uncappedTranslationY, mTranslationY);
mTabLayout.setTranslationY(mTranslationY);
mClip.top = mMaxTranslation + mTranslationY;
// clipping on a draw might cause additional redraw
mMainRV.setClipBounds(mClip);
if (mWorkRV != null) {
mWorkRV.setClipBounds(mClip);
}
}
public void reset() {
int translateTo = 0;
mAnimator.setIntValues(mTranslationY, translateTo);
mAnimator.addUpdateListener(this);
mAnimator.setDuration(150);
mAnimator.start();
mHeaderCollapsed = false;
mSnappedScrolledY = -mMaxTranslation;
mCurrentRV.scrollToTop();
}
public boolean isExpanded() {
return !mHeaderCollapsed;
}
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mTranslationY = (Integer) animation.getAnimatedValue();
apply();
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
calcOffset(mTempOffset);
ev.offsetLocation(mTempOffset.x, mTempOffset.y);
mForwardToRecyclerView = mCurrentRV.onInterceptTouchEvent(ev);
ev.offsetLocation(-mTempOffset.x, -mTempOffset.y);
return mForwardToRecyclerView || super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mForwardToRecyclerView) {
// take this view's and parent view's (view pager) location into account
calcOffset(mTempOffset);
event.offsetLocation(mTempOffset.x, mTempOffset.y);
try {
return mCurrentRV.onTouchEvent(event);
} finally {
event.offsetLocation(-mTempOffset.x, -mTempOffset.y);
}
} else {
return super.onTouchEvent(event);
}
}
private void calcOffset(Point p) {
p.x = getLeft() - mCurrentRV.getLeft() - mParent.getLeft();
p.y = getTop() - mCurrentRV.getTop() - mParent.getTop();
}
}
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