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      1 /*
      2  * Copyright (C) 2008 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.settings;
     18 
     19 import android.content.Context;
     20 import android.support.v7.preference.Preference;
     21 import android.support.v7.preference.PreferenceViewHolder;
     22 import android.util.AttributeSet;
     23 import android.view.View;
     24 
     25 /**
     26  * A category with a progress spinner
     27  */
     28 public class ProgressCategory extends ProgressCategoryBase {
     29 
     30     private int mEmptyTextRes;
     31     private boolean mProgress = false;
     32     private Preference mNoDeviceFoundPreference;
     33     private boolean mNoDeviceFoundAdded;
     34 
     35     public ProgressCategory(Context context) {
     36         this(context, null);
     37     }
     38 
     39     public ProgressCategory(Context context, AttributeSet attrs) {
     40         super(context, attrs, 0);
     41     }
     42 
     43     public ProgressCategory(Context context, AttributeSet attrs,
     44             int defStyleAttr) {
     45         this(context, attrs, defStyleAttr, 0);
     46     }
     47 
     48     public ProgressCategory(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
     49         super(context, attrs, defStyleAttr, defStyleRes);
     50         setLayoutResource(R.layout.preference_progress_category);
     51     }
     52 
     53     public void setEmptyTextRes(int emptyTextRes) {
     54         mEmptyTextRes = emptyTextRes;
     55     }
     56 
     57     @Override
     58     public void onBindViewHolder(PreferenceViewHolder view) {
     59         super.onBindViewHolder(view);
     60         final View progressBar = view.findViewById(R.id.scanning_progress);
     61 
     62         boolean noDeviceFound = (getPreferenceCount() == 0 ||
     63                 (getPreferenceCount() == 1 && getPreference(0) == mNoDeviceFoundPreference));
     64         progressBar.setVisibility(mProgress ? View.VISIBLE : View.GONE);
     65 
     66         if (mProgress || !noDeviceFound) {
     67             if (mNoDeviceFoundAdded) {
     68                 removePreference(mNoDeviceFoundPreference);
     69                 mNoDeviceFoundAdded = false;
     70             }
     71         } else {
     72             if (!mNoDeviceFoundAdded) {
     73                 if (mNoDeviceFoundPreference == null) {
     74                     mNoDeviceFoundPreference = new Preference(getPreferenceManager().getContext());
     75                     mNoDeviceFoundPreference.setLayoutResource(R.layout.preference_empty_list);
     76                     mNoDeviceFoundPreference.setTitle(mEmptyTextRes);
     77                     mNoDeviceFoundPreference.setSelectable(false);
     78                 }
     79                 addPreference(mNoDeviceFoundPreference);
     80                 mNoDeviceFoundAdded = true;
     81             }
     82         }
     83     }
     84 
     85     @Override
     86     public void setProgress(boolean progressOn) {
     87         mProgress = progressOn;
     88         notifyChanged();
     89     }
     90 }
     91