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      1 /*
      2  * Copyright (C) 2011 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.camera.ui;
     18 
     19 import com.android.camera.ListPreference;
     20 import com.android.camera.R;
     21 
     22 import android.content.Context;
     23 import android.os.Handler;
     24 import android.util.AttributeSet;
     25 import android.util.Log;
     26 import android.view.MotionEvent;
     27 import android.view.View;
     28 import android.view.View.OnTouchListener;
     29 import android.view.accessibility.AccessibilityEvent;
     30 import android.widget.Button;
     31 import android.widget.TextView;
     32 
     33 /* A knob setting control. */
     34 public class InLineSettingKnob extends InLineSettingItem {
     35     private final String TAG = "InLineSettingKnob";
     36     private boolean mNext, mPrevious;
     37     private Button mPrevButton, mNextButton;
     38     private Handler mHandler;
     39     // The view that shows the current selected setting. Ex: 5MP
     40     private TextView mEntry;
     41 
     42     private final Runnable mRunnable = new Runnable() {
     43         public void run() {
     44             if (mNext) {
     45                 if (changeIndex(mIndex - 1)) {
     46                     mHandler.postDelayed(this, 100);
     47                 }
     48             } else if (mPrevious) {
     49                 if (changeIndex(mIndex + 1)) {
     50                     mHandler.postDelayed(this, 100);
     51                 }
     52             }
     53         }
     54     };
     55 
     56     public InLineSettingKnob(Context context, AttributeSet attrs) {
     57         super(context, attrs);
     58         mHandler = new Handler();
     59     }
     60 
     61     OnTouchListener mNextTouchListener = new OnTouchListener() {
     62         public boolean onTouch(View v, MotionEvent event) {
     63             if (mOverrideValue != null) return true;
     64             if (event.getAction() == MotionEvent.ACTION_DOWN) {
     65                 if (!mNext && changeIndex(mIndex - 1)) {
     66                     mNext = true;
     67                     // Give bigger delay so users can change only one step.
     68                     mHandler.postDelayed(mRunnable, 300);
     69                 }
     70             } else if (event.getAction() == MotionEvent.ACTION_UP
     71                     || event.getAction() == MotionEvent.ACTION_CANCEL) {
     72                 mNext = false;
     73             }
     74             return false;
     75         }
     76     };
     77 
     78     OnTouchListener mPreviousTouchListener = new OnTouchListener() {
     79         public boolean onTouch(View v, MotionEvent event) {
     80             if (mOverrideValue != null) return true;
     81             if (event.getAction() == MotionEvent.ACTION_DOWN) {
     82                 if (!mPrevious && changeIndex(mIndex + 1)) {
     83                     mPrevious = true;
     84                     // Give bigger delay so users can change only one step.
     85                     mHandler.postDelayed(mRunnable, 300);
     86                 }
     87             } else if (event.getAction() == MotionEvent.ACTION_UP
     88                     || event.getAction() == MotionEvent.ACTION_CANCEL) {
     89                 mPrevious = false;
     90             }
     91             return false;
     92         }
     93     };
     94 
     95     @Override
     96     protected void onFinishInflate() {
     97         super.onFinishInflate();
     98         mNextButton = (Button) findViewById(R.id.increment);
     99         mNextButton.setOnTouchListener(mNextTouchListener);
    100         mPrevButton = (Button) findViewById(R.id.decrement);
    101         mPrevButton.setOnTouchListener(mPreviousTouchListener);
    102         mEntry = (TextView) findViewById(R.id.current_setting);
    103     }
    104 
    105     @Override
    106     public void initialize(ListPreference preference) {
    107         super.initialize(preference);
    108         // Add content descriptions for the increment and decrement buttons.
    109         mNextButton.setContentDescription(getResources().getString(
    110                 R.string.accessibility_increment, mPreference.getTitle()));
    111         mPrevButton.setContentDescription(getResources().getString(
    112                 R.string.accessibility_decrement, mPreference.getTitle()));
    113     }
    114 
    115     protected void updateView() {
    116         if (mOverrideValue == null) {
    117             mEntry.setText(mPreference.getEntry());
    118             mNextButton.setVisibility(mIndex == 0 ? View.INVISIBLE : View.VISIBLE);
    119             mPrevButton.setVisibility(mIndex == mPreference.getEntryValues().length - 1
    120                     ? View.INVISIBLE : View.VISIBLE);
    121         } else {
    122             int index = mPreference.findIndexOfValue(mOverrideValue);
    123             if (index != -1) {
    124                 mEntry.setText(mPreference.getEntries()[index]);
    125             } else {
    126                 // Avoid the crash if camera driver has bugs.
    127                 Log.e(TAG, "Fail to find override value=" + mOverrideValue);
    128                 mPreference.print();
    129             }
    130             mNextButton.setVisibility(View.INVISIBLE);
    131             mPrevButton.setVisibility(View.INVISIBLE);
    132         }
    133     }
    134 
    135     @Override
    136     public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
    137         onPopulateAccessibilityEvent(event);
    138         return true;
    139     }
    140 
    141     @Override
    142     public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
    143         super.onPopulateAccessibilityEvent(event);
    144         event.getText().add(mPreference.getTitle() + mPreference.getEntry());
    145     }
    146 }
    147