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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 android.view.View.MeasureSpec.EXACTLY;
import static android.view.View.MeasureSpec.makeMeasureSpec;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import androidx.recyclerview.widget.RecyclerView.ViewHolder;
import com.android.launcher3.recyclerview.ViewHolderBinder;
import com.android.launcher3.widget.model.WidgetListSpaceEntry;
import java.util.List;
import java.util.function.IntSupplier;
/**
* {@link ViewHolderBinder} for binding the top empty space
*/
public class WidgetsSpaceViewHolderBinder
implements ViewHolderBinder<WidgetListSpaceEntry, ViewHolder> {
private final IntSupplier mEmptySpaceHeightProvider;
public WidgetsSpaceViewHolderBinder(IntSupplier emptySpaceHeightProvider) {
mEmptySpaceHeightProvider = emptySpaceHeightProvider;
}
@Override
public ViewHolder newViewHolder(ViewGroup parent) {
return new ViewHolder(new EmptySpaceView(parent.getContext())) { };
}
@Override
public void bindViewHolder(ViewHolder holder, WidgetListSpaceEntry data,
@ListPosition int position, List<Object> payloads) {
((EmptySpaceView) holder.itemView).setFixedHeight(mEmptySpaceHeightProvider.getAsInt());
}
/**
* Empty view which allows listening for 'Y' changes
*/
public static class EmptySpaceView extends View {
private Runnable mOnYChangeCallback;
private int mHeight = 0;
private EmptySpaceView(Context context) {
super(context);
animate().setUpdateListener(v -> notifyYChanged());
}
/**
* Sets the height for the empty view
* @return true if the height changed, false otherwise
*/
public boolean setFixedHeight(int height) {
if (mHeight != height) {
mHeight = height;
requestLayout();
return true;
}
return false;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, makeMeasureSpec(mHeight, EXACTLY));
}
public void setOnYChangeCallback(Runnable callback) {
mOnYChangeCallback = callback;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
notifyYChanged();
}
@Override
public void offsetTopAndBottom(int offset) {
super.offsetTopAndBottom(offset);
notifyYChanged();
}
@Override
public void setTranslationY(float translationY) {
super.setTranslationY(translationY);
notifyYChanged();
}
private void notifyYChanged() {
if (mOnYChangeCallback != null) {
mOnYChangeCallback.run();
}
}
}
}
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