content: /*
   * 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 androidx.constraintlayout.helper.widget;
  
  import android.annotation.SuppressLint;
  import android.content.Context;
  import android.util.AttributeSet;
  import android.util.SparseArray;
  
  import androidx.constraintlayout.core.widgets.ConstraintWidget;
  import androidx.constraintlayout.core.widgets.ConstraintWidgetContainer;
  import androidx.constraintlayout.core.widgets.Helper;
  import androidx.constraintlayout.core.widgets.Placeholder;
  import androidx.constraintlayout.widget.VirtualLayout;
  
  public class MotionPlaceholder extends VirtualLayout {
      private static final String TAG = "MotionPlaceholder";
      Placeholder mPlaceholder;
  
      public MotionPlaceholder(Context context) {
          super(context);
      }
  
      public MotionPlaceholder(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      public MotionPlaceholder(Context context, AttributeSet attrs, int defStyleAttr) {
          super(context, attrs, defStyleAttr);
      }
  
      public MotionPlaceholder(Context context,
                               AttributeSet attrs,
                               int defStyleAttr,
                               int defStyleRes) {
          super(context, attrs, defStyleAttr);
      }
  
      @SuppressLint("WrongCall")
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          onMeasure(mPlaceholder, widthMeasureSpec, heightMeasureSpec);
      }
  
      @Override
      public void onMeasure(androidx.constraintlayout.core.widgets.VirtualLayout layout,
                            int widthMeasureSpec,
                            int heightMeasureSpec) {
          int widthMode = MeasureSpec.getMode(widthMeasureSpec);
          int widthSize = MeasureSpec.getSize(widthMeasureSpec);
          int heightMode = MeasureSpec.getMode(heightMeasureSpec);
          int heightSize = MeasureSpec.getSize(heightMeasureSpec);
          if (layout != null) {
              layout.measure(widthMode, widthSize, heightMode, heightSize);
              setMeasuredDimension(layout.getMeasuredWidth(), layout.getMeasuredHeight());
          } else {
              setMeasuredDimension(0, 0);
          }
      }
  
      @Override
      public void updatePreLayout(ConstraintWidgetContainer container,
                                  Helper helper,
                                  SparseArray<ConstraintWidget> map) {
          // override to block the ids being replaced
      }
  
      @Override
      protected void init(AttributeSet attrs) {
          super.init(attrs);
          mHelperWidget = new Placeholder();
          validateParams();
      }
  }
  