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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.documentsui.sorting;
     18 
     19 import android.animation.AnimatorInflater;
     20 import android.animation.LayoutTransition;
     21 import android.animation.ObjectAnimator;
     22 import android.annotation.AnimatorRes;
     23 import android.annotation.StringRes;
     24 import android.content.Context;
     25 import android.util.AttributeSet;
     26 import android.view.Gravity;
     27 import android.view.View;
     28 import android.widget.ImageView;
     29 import android.widget.LinearLayout;
     30 import android.widget.TextView;
     31 
     32 import com.android.documentsui.R;
     33 import com.android.documentsui.sorting.SortDimension;
     34 
     35 /**
     36  * A clickable, sortable table header cell layout.
     37  *
     38  * It updates its display when it binds to {@link SortDimension} and changes the status of sorting
     39  * when it's clicked.
     40  */
     41 public class HeaderCell extends LinearLayout {
     42 
     43     private static final long ANIMATION_DURATION = 100;
     44 
     45     private @SortDimension.SortDirection int mCurDirection = SortDimension.SORT_DIRECTION_NONE;
     46 
     47     public HeaderCell(Context context) {
     48         this(context, null);
     49     }
     50 
     51     public HeaderCell(Context context, AttributeSet attrs) {
     52         super(context, attrs);
     53 
     54         LayoutTransition transition = getLayoutTransition();
     55         transition.setDuration(ANIMATION_DURATION);
     56         transition.setStartDelay(LayoutTransition.CHANGE_APPEARING, 0);
     57         transition.setStartDelay(LayoutTransition.CHANGE_DISAPPEARING, 0);
     58         transition.setStartDelay(LayoutTransition.CHANGING, 0);
     59     }
     60 
     61     void onBind(SortDimension dimension) {
     62         setVisibility(dimension.getVisibility());
     63 
     64         if (dimension.getVisibility() == View.VISIBLE) {
     65             TextView label = (TextView) findViewById(R.id.label);
     66             label.setText(dimension.getLabelId());
     67             switch (dimension.getDataType()) {
     68                 case SortDimension.DATA_TYPE_NUMBER:
     69                     setDataTypeNumber(label);
     70                     break;
     71                 case SortDimension.DATA_TYPE_STRING:
     72                     setDataTypeString(label);
     73                     break;
     74                 default:
     75                     throw new IllegalArgumentException(
     76                             "Unknown column data type: " + dimension.getDataType() + ".");
     77             }
     78 
     79             if (mCurDirection != dimension.getSortDirection()) {
     80                 ImageView arrow = (ImageView) findViewById(R.id.sort_arrow);
     81                 switch (dimension.getSortDirection()) {
     82                     case SortDimension.SORT_DIRECTION_NONE:
     83                         arrow.setVisibility(View.GONE);
     84                         break;
     85                     case SortDimension.SORT_DIRECTION_ASCENDING:
     86                         showArrow(arrow, R.animator.arrow_rotate_up,
     87                                 R.string.sort_direction_ascending);
     88                         break;
     89                     case SortDimension.SORT_DIRECTION_DESCENDING:
     90                         showArrow(arrow, R.animator.arrow_rotate_down,
     91                                 R.string.sort_direction_descending);
     92                         break;
     93                     default:
     94                         throw new IllegalArgumentException(
     95                                 "Unknown sort direction: " + dimension.getSortDirection() + ".");
     96                 }
     97 
     98                 mCurDirection = dimension.getSortDirection();
     99             }
    100         }
    101     }
    102 
    103     private void showArrow(
    104             ImageView arrow, @AnimatorRes int anim, @StringRes int contentDescriptionId) {
    105         arrow.setVisibility(View.VISIBLE);
    106 
    107         CharSequence description = getContext().getString(contentDescriptionId);
    108         arrow.setContentDescription(description);
    109 
    110         ObjectAnimator animator =
    111                 (ObjectAnimator) AnimatorInflater.loadAnimator(getContext(), anim);
    112         animator.setTarget(arrow.getDrawable().mutate());
    113         animator.start();
    114     }
    115 
    116     private void setDataTypeNumber(View label) {
    117         label.setTextAlignment(View.TEXT_ALIGNMENT_VIEW_END);
    118         setGravity(Gravity.CENTER_VERTICAL | Gravity.END);
    119     }
    120 
    121     private void setDataTypeString(View label) {
    122         label.setTextAlignment(View.TEXT_ALIGNMENT_VIEW_START);
    123         setGravity(Gravity.CENTER_VERTICAL | Gravity.START);
    124     }
    125 }
    126