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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");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.launcher3.keyboard;
     18 
     19 import android.graphics.Rect;
     20 import android.view.View;
     21 import android.view.View.OnFocusChangeListener;
     22 
     23 import com.android.launcher3.PagedView;
     24 
     25 /**
     26  * {@link FocusIndicatorHelper} for a generic view group.
     27  */
     28 public class ViewGroupFocusHelper extends FocusIndicatorHelper {
     29 
     30     private final View mContainer;
     31 
     32     public ViewGroupFocusHelper(View container) {
     33         super(container);
     34         mContainer = container;
     35     }
     36 
     37     @Override
     38     public void viewToRect(View v, Rect outRect) {
     39         outRect.left = 0;
     40         outRect.top = 0;
     41 
     42         computeLocationRelativeToContainer(v, outRect);
     43 
     44         // If a view is scaled, its position will also shift accordingly. For optimization, only
     45         // consider this for the last node.
     46         outRect.left += (1 - v.getScaleX()) * v.getWidth() / 2;
     47         outRect.top += (1 - v.getScaleY()) * v.getHeight() / 2;
     48 
     49         outRect.right = outRect.left + (int) (v.getScaleX() * v.getWidth());
     50         outRect.bottom = outRect.top + (int) (v.getScaleY() * v.getHeight());
     51     }
     52 
     53     private void computeLocationRelativeToContainer(View child, Rect outRect) {
     54         View parent = (View) child.getParent();
     55         outRect.left += child.getLeft();
     56         outRect.top += child.getTop();
     57 
     58         if (parent != mContainer) {
     59             if (parent instanceof PagedView) {
     60                 PagedView page = (PagedView) parent;
     61                 outRect.left -= page.getScrollForPage(page.indexOfChild(child));
     62             }
     63 
     64             computeLocationRelativeToContainer(parent, outRect);
     65         }
     66     }
     67 
     68     /**
     69      * Sets the alpha of this FocusIndicatorHelper to 0 when a view with this listener
     70      * receives focus.
     71      */
     72     public View.OnFocusChangeListener getHideIndicatorOnFocusListener() {
     73         return new OnFocusChangeListener() {
     74             @Override
     75             public void onFocusChange(View v, boolean hasFocus) {
     76                 if (hasFocus) {
     77                     endCurrentAnimation();
     78                     setCurrentView(null);
     79                     setAlpha(0);
     80                     invalidateDirty();
     81                 }
     82             }
     83         };
     84     }
     85 }
     86