| /* |
| * Copyright (C) 2016 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 android.support.v17.internal.widget; |
| |
| import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP; |
| |
| import android.content.Context; |
| import android.graphics.Outline; |
| import android.support.annotation.RequiresApi; |
| import android.support.annotation.RestrictTo; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewOutlineProvider; |
| import android.widget.FrameLayout; |
| |
| /** |
| * {@link FrameLayout} subclass that provides an outline only when it has children, so that it does |
| * not cast a shadow when empty. |
| * |
| * @hide |
| */ |
| @RequiresApi(21) |
| @RestrictTo(LIBRARY_GROUP) |
| public class OutlineOnlyWithChildrenFrameLayout extends FrameLayout { |
| |
| private ViewOutlineProvider mMagicalOutlineProvider; |
| private ViewOutlineProvider mInnerOutlineProvider; |
| |
| public OutlineOnlyWithChildrenFrameLayout(Context context) { |
| super(context); |
| } |
| |
| public OutlineOnlyWithChildrenFrameLayout(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| public OutlineOnlyWithChildrenFrameLayout(Context context, AttributeSet attrs, |
| int defStyleAttr) { |
| super(context, attrs, defStyleAttr); |
| } |
| |
| public OutlineOnlyWithChildrenFrameLayout(Context context, AttributeSet attrs, |
| int defStyleAttr, int defStyleRes) { |
| super(context, attrs, defStyleAttr, defStyleRes); |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| super.onLayout(changed, left, top, right, bottom); |
| invalidateOutline(); |
| } |
| |
| @Override |
| public void setOutlineProvider(ViewOutlineProvider provider) { |
| mInnerOutlineProvider = provider; |
| if (mMagicalOutlineProvider == null) { |
| // Can't initialize this directly because this method is called from the superclass's |
| // constructor. |
| mMagicalOutlineProvider = new ViewOutlineProvider() { |
| @Override |
| public void getOutline(View view, Outline outline) { |
| if (getChildCount() > 0) { |
| mInnerOutlineProvider.getOutline(view, outline); |
| } else { |
| ViewOutlineProvider.BACKGROUND.getOutline(view, outline); |
| } |
| } |
| }; |
| } |
| super.setOutlineProvider(mMagicalOutlineProvider); |
| } |
| } |