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Merge "Use LayoutManager.onLayoutCompleted as a signal that content has changed" into sc-dev

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This commit is contained in:
Stevie Kideckel
2021-06-14 09:18:06 +00:00
committed by Android (Google) Code Review
parent 7937cecde2 2dab912b95
commit d541300f0e
2 changed files with 58 additions and 18 deletions
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51
src/com/android/launcher3/widget/picker/WidgetsListLayoutManager.java Normal file
View File

@@ -0,0 +1,51 @@
/*
* 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 android.content.Context;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.android.launcher3.widget.picker.SearchAndRecommendationsScrollController.OnContentChangeListener;
/**
* A layout manager for the {@link WidgetsRecyclerView}.
*
* {@link #setOnContentChangeListener(OnContentChangeListener)} can be used to register a callback
* for when the content of the layout manager has changed, following measurement and animation.
*/
public final class WidgetsListLayoutManager extends LinearLayoutManager {
@Nullable
private OnContentChangeListener mOnContentChangeListener;
public WidgetsListLayoutManager(Context context) {
super(context);
}
@Override
public void onLayoutCompleted(RecyclerView.State state) {
super.onLayoutCompleted(state);
if (mOnContentChangeListener != null) {
mOnContentChangeListener.onContentChanged();
}
}
public void setOnContentChangeListener(@Nullable OnContentChangeListener listener) {
mOnContentChangeListener = listener;
}
}

25
src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java
View File

@@ -23,7 +23,6 @@ import android.view.MotionEvent;
import android.view.View;
import android.widget.TableLayout;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
@@ -83,7 +82,9 @@ public class WidgetsRecyclerView extends BaseRecyclerView implements OnItemTouch
super.onFinishInflate();
// create a layout manager with Launcher's context so that scroll position
// can be preserved during screen rotation.
setLayoutManager(new LinearLayoutManager(getContext()));
WidgetsListLayoutManager layoutManager = new WidgetsListLayoutManager(getContext());
layoutManager.setOnContentChangeListener(mOnContentChangeListener);
setLayoutManager(layoutManager);
}
@Override
@@ -92,22 +93,6 @@ public class WidgetsRecyclerView extends BaseRecyclerView implements OnItemTouch
mAdapter = (WidgetsListAdapter) adapter;
}
@Override
public void onChildAttachedToWindow(@NonNull View child) {
super.onChildAttachedToWindow(child);
if (mOnContentChangeListener != null) {
mOnContentChangeListener.onContentChanged();
}
}
@Override
public void onChildDetachedFromWindow(@NonNull View child) {
super.onChildDetachedFromWindow(child);
if (mOnContentChangeListener != null) {
mOnContentChangeListener.onContentChanged();
}
}
/**
* Maps the touch (from 0..1) to the adapter position that should be visible.
*/
@@ -268,6 +253,10 @@ public class WidgetsRecyclerView extends BaseRecyclerView implements OnItemTouch
public void setOnContentChangeListener(@Nullable OnContentChangeListener listener) {
mOnContentChangeListener = listener;
WidgetsListLayoutManager layoutManager = (WidgetsListLayoutManager) getLayoutManager();
if (layoutManager != null) {
layoutManager.setOnContentChangeListener(listener);
}
}
/**