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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
      5  * in compliance with the License. You may obtain a copy of the License at
      6  *
      7  * http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the License
     10  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
     11  * or implied. See the License for the specific language governing permissions and limitations under
     12  * the License.
     13  */
     14 package android.windowanimationjank;
     15 
     16 import android.content.Context;
     17 import android.util.AttributeSet;
     18 import android.view.View;
     19 import android.view.ViewGroup;
     20 
     21 /**
     22  * Custom layout that place all elements in flows with and automatically wraps them.
     23  */
     24 public class FlowLayout extends ViewGroup {
     25     private int mLineHeight;
     26 
     27     public FlowLayout(Context context) {
     28         super(context);
     29     }
     30 
     31     public FlowLayout(Context context, AttributeSet attrs) {
     32         super(context, attrs);
     33     }
     34 
     35     @Override
     36     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     37         final int width =
     38                 MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() -getPaddingRight();
     39         int height =
     40                 MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();
     41         final int count = getChildCount();
     42 
     43         int x = getPaddingLeft();
     44         int y = getPaddingTop();
     45         int lineHeight = 0;
     46 
     47         int childHeightMeasureSpec;
     48         if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
     49             childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
     50         } else {
     51             childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
     52         }
     53 
     54         for (int i = 0; i < count; i++) {
     55             final View child = getChildAt(i);
     56             if (child.getVisibility() != GONE) {
     57                 child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST),
     58                         childHeightMeasureSpec);
     59                 final int childWidth = child.getMeasuredWidth();
     60                 lineHeight = Math.max(lineHeight, child.getMeasuredHeight());
     61 
     62                 if (x + childWidth > width) {
     63                     x = getPaddingLeft();
     64                     y += lineHeight;
     65                 }
     66 
     67                 x += childWidth;
     68             }
     69         }
     70         mLineHeight = lineHeight;
     71 
     72         if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) {
     73             height = y + lineHeight;
     74         } else if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
     75             if (y + lineHeight < height) {
     76                 height = y + lineHeight;
     77             }
     78         }
     79         setMeasuredDimension(width, height);
     80     }
     81 
     82     @Override
     83     protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
     84         if (p instanceof LayoutParams) {
     85             return true;
     86         }
     87         return false;
     88     }
     89 
     90     @Override
     91     protected void onLayout(boolean changed, int l, int t, int r, int b) {
     92         final int count = getChildCount();
     93         final int width = r - l;
     94         int x = getPaddingLeft();
     95         int y = getPaddingTop();
     96 
     97         for (int i = 0; i < count; i++) {
     98             final View child = getChildAt(i);
     99             if (child.getVisibility() != GONE) {
    100                 final int childWidth = child.getMeasuredWidth();
    101                 final int childHeight = child.getMeasuredHeight();
    102                 if (x + childWidth > width) {
    103                     x = getPaddingLeft();
    104                     y += mLineHeight;
    105                 }
    106                 child.layout(x, y, x + childWidth, y + childHeight);
    107                 x += childWidth;
    108             }
    109         }
    110     }
    111 }
    112