content: /*
   * Copyright (C) 2015 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.internal.widget;
  
  import android.content.Context;
  import android.graphics.drawable.Drawable;
  import android.util.AttributeSet;
  import android.view.View;
  import android.widget.ViewAnimator;
  
  import java.util.ArrayList;
  
  /**
   * ViewAnimator with a more reasonable handling of MATCH_PARENT.
   */
  public class DialogViewAnimator extends ViewAnimator {
      private final ArrayList<View> mMatchParentChildren = new ArrayList<>(1);
  
      public DialogViewAnimator(Context context) {
          super(context);
      }
  
      public DialogViewAnimator(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          final boolean measureMatchParentChildren =
                  MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.EXACTLY ||
                          MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.EXACTLY;
  
          int maxHeight = 0;
          int maxWidth = 0;
          int childState = 0;
  
          // First measure all children and record maximum dimensions where the
          // spec isn't MATCH_PARENT.
          final int count = getChildCount();
          for (int i = 0; i < count; i++) {
              final View child = getChildAt(i);
              if (getMeasureAllChildren() || child.getVisibility() != GONE) {
                  final LayoutParams lp = (LayoutParams) child.getLayoutParams();
                  final boolean matchWidth = lp.width == LayoutParams.MATCH_PARENT;
                  final boolean matchHeight = lp.height == LayoutParams.MATCH_PARENT;
                  if (measureMatchParentChildren && (matchWidth || matchHeight)) {
                      mMatchParentChildren.add(child);
                  }
  
                  measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, 0);
  
                  // Measured dimensions only count against the maximum
                  // dimensions if they're not MATCH_PARENT.
                  int state = 0;
  
                  if (measureMatchParentChildren && !matchWidth) {
                      maxWidth = Math.max(maxWidth, child.getMeasuredWidth()
                              + lp.leftMargin + lp.rightMargin);
                      state |= child.getMeasuredWidthAndState() & MEASURED_STATE_MASK;
                  }
  
                  if (measureMatchParentChildren && !matchHeight) {
                      maxHeight = Math.max(maxHeight, child.getMeasuredHeight()
                              + lp.topMargin + lp.bottomMargin);
                      state |= (child.getMeasuredHeightAndState() >> MEASURED_HEIGHT_STATE_SHIFT)
                              & (MEASURED_STATE_MASK >> MEASURED_HEIGHT_STATE_SHIFT);
                  }
  
                  childState = combineMeasuredStates(childState, state);
              }
          }
  
          // Account for padding too.
          maxWidth += getPaddingLeft() + getPaddingRight();
          maxHeight += getPaddingTop() + getPaddingBottom();
  
          // Check against our minimum height and width.
          maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
          maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
  
          // Check against our foreground's minimum height and width.
          final Drawable drawable = getForeground();
          if (drawable != null) {
              maxHeight = Math.max(maxHeight, drawable.getMinimumHeight());
              maxWidth = Math.max(maxWidth, drawable.getMinimumWidth());
          }
  
          setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, childState),
                  resolveSizeAndState(maxHeight, heightMeasureSpec,
                          childState << MEASURED_HEIGHT_STATE_SHIFT));
  
          // Measure remaining MATCH_PARENT children again using real dimensions.
          final int matchCount = mMatchParentChildren.size();
          for (int i = 0; i < matchCount; i++) {
              final View child = mMatchParentChildren.get(i);
              final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
  
              final int childWidthMeasureSpec;
              if (lp.width == LayoutParams.MATCH_PARENT) {
                  childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
                          getMeasuredWidth() - getPaddingLeft() - getPaddingRight()
                                  - lp.leftMargin - lp.rightMargin,
                          MeasureSpec.EXACTLY);
              } else {
                  childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec,
                          getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin,
                          lp.width);
              }
  
              final int childHeightMeasureSpec;
              if (lp.height == LayoutParams.MATCH_PARENT) {
                  childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
                          getMeasuredHeight() - getPaddingTop() - getPaddingBottom()
                                  - lp.topMargin - lp.bottomMargin,
                          MeasureSpec.EXACTLY);
              } else {
                  childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec,
                          getPaddingTop() + getPaddingBottom() + lp.topMargin + lp.bottomMargin,
                          lp.height);
              }
  
              child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
          }
  
          mMatchParentChildren.clear();
      }
  }
  