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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
      5  * except 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
     10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     11  * KIND, either express or implied. See the License for the specific language governing
     12  * permissions and limitations under the License.
     13  */
     14 
     15 package com.android.systemui;
     16 
     17 import android.content.Context;
     18 import android.content.res.Configuration;
     19 import android.content.res.TypedArray;
     20 import android.graphics.Canvas;
     21 import android.util.AttributeSet;
     22 import android.view.View;
     23 import android.view.ViewGroup.LayoutParams;
     24 
     25 public class ResizingSpace extends View {
     26 
     27     private final int mWidth;
     28     private final int mHeight;
     29 
     30     public ResizingSpace(Context context, AttributeSet attrs) {
     31         super(context, attrs);
     32         if (getVisibility() == VISIBLE) {
     33             setVisibility(INVISIBLE);
     34         }
     35         TypedArray a = context.obtainStyledAttributes(attrs, android.R.styleable.ViewGroup_Layout);
     36         mWidth = a.getResourceId(android.R.styleable.ViewGroup_Layout_layout_width, 0);
     37         mHeight = a.getResourceId(android.R.styleable.ViewGroup_Layout_layout_height, 0);
     38     }
     39 
     40     @Override
     41     protected void onConfigurationChanged(Configuration newConfig) {
     42         super.onConfigurationChanged(newConfig);
     43         LayoutParams params = getLayoutParams();
     44         boolean changed = false;
     45         if (mWidth > 0) {
     46             int width = getContext().getResources().getDimensionPixelOffset(mWidth);
     47             if (width != params.width) {
     48                 params.width = width;
     49                 changed = true;
     50             }
     51         }
     52         if (mHeight > 0) {
     53             int height = getContext().getResources().getDimensionPixelOffset(mHeight);
     54             if (height != params.height) {
     55                 params.height = height;
     56                 changed = true;
     57             }
     58         }
     59         if (changed) {
     60             setLayoutParams(params);
     61         }
     62     }
     63 
     64     /**
     65      * Draw nothing.
     66      *
     67      * @param canvas an unused parameter.
     68      */
     69     @Override
     70     public void draw(Canvas canvas) {
     71     }
     72 
     73     /**
     74      * Compare to: {@link View#getDefaultSize(int, int)}
     75      * If mode is AT_MOST, return the child size instead of the parent size
     76      * (unless it is too big).
     77      */
     78     private static int getDefaultSize2(int size, int measureSpec) {
     79         int result = size;
     80         int specMode = MeasureSpec.getMode(measureSpec);
     81         int specSize = MeasureSpec.getSize(measureSpec);
     82 
     83         switch (specMode) {
     84             case MeasureSpec.UNSPECIFIED:
     85                 result = size;
     86                 break;
     87             case MeasureSpec.AT_MOST:
     88                 result = Math.min(size, specSize);
     89                 break;
     90             case MeasureSpec.EXACTLY:
     91                 result = specSize;
     92                 break;
     93         }
     94         return result;
     95     }
     96 
     97     @Override
     98     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     99         setMeasuredDimension(
    100                 getDefaultSize2(getSuggestedMinimumWidth(), widthMeasureSpec),
    101                 getDefaultSize2(getSuggestedMinimumHeight(), heightMeasureSpec));
    102     }
    103 
    104 }
    105