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/*
* Copyright (C) 2021 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.widget.picker;
import static com.android.launcher3.anim.AnimatorListeners.forEndCallback;
import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.util.FloatProperty;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.RecyclerView;
import com.android.launcher3.R;
import com.android.launcher3.widget.picker.WidgetsSpaceViewHolderBinder.EmptySpaceView;
import com.android.launcher3.widget.picker.search.WidgetsSearchBar;
/**
* A controller which measures & updates {@link WidgetsFullSheet}'s views padding, margin and
* vertical displacement upon scrolling.
*/
final class SearchAndRecommendationsScrollController implements
RecyclerView.OnChildAttachStateChangeListener {
private static final FloatProperty<SearchAndRecommendationsScrollController> SCROLL_OFFSET =
new FloatProperty<SearchAndRecommendationsScrollController>("scrollAnimOffset") {
@Override
public void setValue(SearchAndRecommendationsScrollController controller, float offset) {
controller.mScrollOffset = offset;
controller.updateHeaderScroll();
}
@Override
public Float get(SearchAndRecommendationsScrollController controller) {
return controller.mScrollOffset;
}
};
private static final MotionEventProxyMethod INTERCEPT_PROXY = ViewGroup::onInterceptTouchEvent;
private static final MotionEventProxyMethod TOUCH_PROXY = ViewGroup::onTouchEvent;
final SearchAndRecommendationsView mContainer;
final View mSearchBarContainer;
final WidgetsSearchBar mSearchBar;
final TextView mHeaderTitle;
final WidgetsRecommendationTableLayout mRecommendedWidgetsTable;
@Nullable final View mTabBar;
private WidgetsRecyclerView mCurrentRecyclerView;
private EmptySpaceView mCurrentEmptySpaceView;
private float mLastScroll = 0;
private float mScrollOffset = 0;
private Animator mOffsetAnimator;
private boolean mShouldForwardToRecyclerView = false;
private int mHeaderHeight;
SearchAndRecommendationsScrollController(
SearchAndRecommendationsView searchAndRecommendationContainer) {
mContainer = searchAndRecommendationContainer;
mSearchBarContainer = mContainer.findViewById(R.id.search_bar_container);
mSearchBar = mContainer.findViewById(R.id.widgets_search_bar);
mHeaderTitle = mContainer.findViewById(R.id.title);
mRecommendedWidgetsTable = mContainer.findViewById(R.id.recommended_widget_table);
mTabBar = mContainer.findViewById(R.id.tabs);
mContainer.setSearchAndRecommendationScrollController(this);
}
public void setCurrentRecyclerView(WidgetsRecyclerView currentRecyclerView) {
boolean animateReset = mCurrentRecyclerView != null;
if (mCurrentRecyclerView != null) {
mCurrentRecyclerView.removeOnChildAttachStateChangeListener(this);
}
mCurrentRecyclerView = currentRecyclerView;
mCurrentRecyclerView.addOnChildAttachStateChangeListener(this);
findCurrentEmptyView();
reset(animateReset);
}
public int getHeaderHeight() {
return mHeaderHeight;
}
private void updateHeaderScroll() {
mLastScroll = getCurrentScroll();
mHeaderTitle.setTranslationY(mLastScroll);
mRecommendedWidgetsTable.setTranslationY(mLastScroll);
float searchYDisplacement = Math.max(mLastScroll, -mSearchBarContainer.getTop());
mSearchBarContainer.setTranslationY(searchYDisplacement);
if (mTabBar != null) {
float tabsDisplacement = Math.max(mLastScroll, -mTabBar.getTop()
+ mSearchBarContainer.getHeight());
mTabBar.setTranslationY(tabsDisplacement);
}
}
private float getCurrentScroll() {
return mScrollOffset + (mCurrentEmptySpaceView == null ? 0 : mCurrentEmptySpaceView.getY());
}
/**
* Updates the scrollable header height
*
* @return {@code true} if the header height or dependent property changed.
*/
public boolean updateHeaderHeight() {
boolean hasSizeUpdated = false;
int headerHeight = mContainer.getMeasuredHeight();
if (headerHeight != mHeaderHeight) {
mHeaderHeight = headerHeight;
hasSizeUpdated = true;
}
if (mCurrentEmptySpaceView != null
&& mCurrentEmptySpaceView.setFixedHeight(mHeaderHeight)) {
hasSizeUpdated = true;
}
return hasSizeUpdated;
}
/** Resets any previous view translation. */
public void reset(boolean animate) {
if (mOffsetAnimator != null) {
mOffsetAnimator.cancel();
mOffsetAnimator = null;
}
mScrollOffset = 0;
if (!animate) {
updateHeaderScroll();
} else {
float startValue = mLastScroll - getCurrentScroll();
mOffsetAnimator = ObjectAnimator.ofFloat(this, SCROLL_OFFSET, startValue, 0);
mOffsetAnimator.addListener(forEndCallback(() -> mOffsetAnimator = null));
mOffsetAnimator.start();
}
}
/**
* Returns {@code true} if a touch event should be intercepted by this controller.
*/
public boolean onInterceptTouchEvent(MotionEvent event) {
return (mShouldForwardToRecyclerView = proxyMotionEvent(event, INTERCEPT_PROXY));
}
/**
* Returns {@code true} if this controller has intercepted and consumed a touch event.
*/
public boolean onTouchEvent(MotionEvent event) {
return mShouldForwardToRecyclerView && proxyMotionEvent(event, TOUCH_PROXY);
}
private boolean proxyMotionEvent(MotionEvent event, MotionEventProxyMethod method) {
float dx = mCurrentRecyclerView.getLeft() - mContainer.getLeft();
float dy = mCurrentRecyclerView.getTop() - mContainer.getTop();
event.offsetLocation(dx, dy);
try {
return method.proxyEvent(mCurrentRecyclerView, event);
} finally {
event.offsetLocation(-dx, -dy);
}
}
@Override
public void onChildViewAttachedToWindow(@NonNull View view) {
if (view instanceof EmptySpaceView) {
findCurrentEmptyView();
}
}
@Override
public void onChildViewDetachedFromWindow(@NonNull View view) {
if (view == mCurrentEmptySpaceView) {
findCurrentEmptyView();
}
}
private void findCurrentEmptyView() {
if (mCurrentEmptySpaceView != null) {
mCurrentEmptySpaceView.setOnYChangeCallback(null);
mCurrentEmptySpaceView = null;
}
int childCount = mCurrentRecyclerView.getChildCount();
for (int i = 0; i < childCount; i++) {
View view = mCurrentRecyclerView.getChildAt(i);
if (view instanceof EmptySpaceView) {
mCurrentEmptySpaceView = (EmptySpaceView) view;
mCurrentEmptySpaceView.setFixedHeight(getHeaderHeight());
mCurrentEmptySpaceView.setOnYChangeCallback(this::updateHeaderScroll);
return;
}
}
}
private interface MotionEventProxyMethod {
boolean proxyEvent(ViewGroup view, MotionEvent event);
}
}
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