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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");
      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 package com.android.settings.development;
     17 
     18 import android.content.Context;
     19 import android.content.res.Resources;
     20 import android.hardware.display.DisplayManager;
     21 import android.hardware.display.DisplayManager.DisplayListener;
     22 import android.os.Handler;
     23 import android.os.Looper;
     24 import android.support.v14.preference.SwitchPreference;
     25 import android.util.AttributeSet;
     26 import android.view.Display;
     27 
     28 import com.android.settings.R;
     29 
     30 import java.util.ArrayList;
     31 
     32 public class ColorModePreference extends SwitchPreference implements DisplayListener {
     33 
     34     private DisplayManager mDisplayManager;
     35     private Display mDisplay;
     36 
     37     private int mCurrentIndex;
     38     private ArrayList<ColorModeDescription> mDescriptions;
     39 
     40     public ColorModePreference(Context context, AttributeSet attrs) {
     41         super(context, attrs);
     42         mDisplayManager = getContext().getSystemService(DisplayManager.class);
     43     }
     44 
     45     public int getColorModeCount() {
     46         return mDescriptions.size();
     47     }
     48 
     49     public void startListening() {
     50         mDisplayManager.registerDisplayListener(this, new Handler(Looper.getMainLooper()));
     51     }
     52 
     53     public void stopListening() {
     54         mDisplayManager.unregisterDisplayListener(this);
     55     }
     56 
     57     @Override
     58     public void onDisplayAdded(int displayId) {
     59         if (displayId == Display.DEFAULT_DISPLAY) {
     60             updateCurrentAndSupported();
     61         }
     62     }
     63 
     64     @Override
     65     public void onDisplayChanged(int displayId) {
     66         if (displayId == Display.DEFAULT_DISPLAY) {
     67             updateCurrentAndSupported();
     68         }
     69     }
     70 
     71     @Override
     72     public void onDisplayRemoved(int displayId) {
     73     }
     74 
     75     public void updateCurrentAndSupported() {
     76         mDisplay = mDisplayManager.getDisplay(Display.DEFAULT_DISPLAY);
     77 
     78         mDescriptions = new ArrayList<>();
     79 
     80         Resources resources = getContext().getResources();
     81         int[] colorModes = resources.getIntArray(R.array.color_mode_ids);
     82         String[] titles = resources.getStringArray(R.array.color_mode_names);
     83         String[] descriptions = resources.getStringArray(R.array.color_mode_descriptions);
     84         // Map the resource information describing color modes.
     85         for (int i = 0; i < colorModes.length; i++) {
     86             if (colorModes[i] != -1 && i != 1 /* Skip Natural for now. */) {
     87                 ColorModeDescription desc = new ColorModeDescription();
     88                 desc.colorMode = colorModes[i];
     89                 desc.title = titles[i];
     90                 desc.summary = descriptions[i];
     91                 mDescriptions.add(desc);
     92             }
     93         }
     94 
     95         int currentColorMode = mDisplay.getColorMode();
     96         mCurrentIndex = -1;
     97         for (int i = 0; i < mDescriptions.size(); i++) {
     98             if (mDescriptions.get(i).colorMode == currentColorMode) {
     99                 mCurrentIndex = i;
    100                 break;
    101             }
    102         }
    103         setChecked(mCurrentIndex == 1);
    104     }
    105 
    106     @Override
    107     protected boolean persistBoolean(boolean value) {
    108         // Right now this is a switch, so we only support two modes.
    109         if (mDescriptions.size() == 2) {
    110             ColorModeDescription desc = mDescriptions.get(value ? 1 : 0);
    111 
    112             mDisplay.requestColorMode(desc.colorMode);
    113             mCurrentIndex = mDescriptions.indexOf(desc);
    114         }
    115 
    116         return true;
    117     }
    118 
    119     private static class ColorModeDescription {
    120         private int colorMode;
    121         private String title;
    122         private String summary;
    123     }
    124 }
    125