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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.R;
     20 
     21 import android.content.Context;
     22 import android.os.Handler;
     23 import android.os.Message;
     24 import android.view.MotionEvent;
     25 import android.view.View;
     26 import android.view.animation.Animation;
     27 import android.view.animation.AnimationUtils;
     28 import android.widget.ImageView;
     29 
     30 // This is an indicator button and pressing it opens a popup window. Ex: flash or other settings.
     31 public abstract class AbstractIndicatorButton extends RotateImageView implements
     32         PopupManager.OnOtherPopupShowedListener {
     33     private final String TAG = "AbstractIndicatorButton";
     34     protected Animation mFadeIn, mFadeOut;
     35     protected final int HIGHLIGHT_COLOR;
     36     protected AbstractSettingPopup mPopup;
     37     protected Handler mHandler = new MainHandler();
     38     private final int MSG_DISMISS_POPUP = 0;
     39     private IndicatorChangeListener mListener;
     40 
     41     public static interface IndicatorChangeListener {
     42         public void onShowIndicator(View view, boolean showed);
     43     }
     44 
     45     public AbstractIndicatorButton(Context context) {
     46         super(context);
     47         mFadeIn = AnimationUtils.loadAnimation(context, R.anim.setting_popup_grow_fade_in);
     48         mFadeOut = AnimationUtils.loadAnimation(context, R.anim.setting_popup_shrink_fade_out);
     49         HIGHLIGHT_COLOR = context.getResources().getColor(R.color.review_control_pressed_color);
     50         setScaleType(ImageView.ScaleType.CENTER);
     51         PopupManager.getInstance(context).setOnOtherPopupShowedListener(this);
     52         // Set the click listener to help the comprehension of the accessibility.
     53         setClickable(true);
     54     }
     55 
     56     @Override
     57     public void onOtherPopupShowed() {
     58         dismissPopup();
     59     }
     60 
     61     public void setIndicatorChangeListener(IndicatorChangeListener listener) {
     62         mListener = listener;
     63     }
     64 
     65     // Whether scene mode affects this indicator and it cannot be changed.
     66     public boolean isOverridden() {
     67         return false;
     68     }
     69 
     70     // Scene mode may override other settings like flash, white-balance, and focus.
     71     abstract public void overrideSettings(final String ... keyvalues);
     72 
     73     @Override
     74     public boolean onTouchEvent(MotionEvent ev) {
     75         if (!isEnabled()) return false;
     76 
     77         int action = ev.getAction();
     78         if (action == MotionEvent.ACTION_DOWN && !isOverridden()) {
     79             if (mPopup == null || mPopup.getVisibility() != View.VISIBLE) {
     80                 showPopup();
     81                 PopupManager.getInstance(getContext()).notifyShowPopup(this);
     82             } else {
     83                 dismissPopup();
     84             }
     85             return true;
     86         } else if (action == MotionEvent.ACTION_CANCEL) {
     87             dismissPopup();
     88             return true;
     89         }
     90         return false;
     91     }
     92 
     93     @Override
     94     public void setEnabled(boolean enabled) {
     95         // Do not enable the button if it is overridden by scene mode.
     96         if (isOverridden()) {
     97             enabled = false;
     98         }
     99 
    100         // Don't do anything if state is not changed so not to interfere with
    101         // the "highlight" state.
    102         if (isEnabled() ^ enabled) {
    103             super.setEnabled(enabled);
    104         }
    105     }
    106 
    107     @Override
    108     public void setOrientation(int orientation) {
    109         super.setOrientation(orientation);
    110         if (mPopup != null) {
    111             mPopup.setOrientation(orientation);
    112         }
    113     }
    114 
    115     abstract protected void initializePopup();
    116 
    117     private void showPopup() {
    118         setPressed(true);
    119         mHandler.removeMessages(MSG_DISMISS_POPUP);
    120         if (mPopup == null) initializePopup();
    121 
    122         mPopup.setVisibility(View.VISIBLE);
    123         mPopup.setOrientation(getDegree());
    124         mPopup.clearAnimation();
    125         mPopup.startAnimation(mFadeIn);
    126         if (mListener != null) mListener.onShowIndicator(this, true);
    127     }
    128 
    129     public boolean dismissPopup() {
    130         setPressed(false);
    131         mHandler.removeMessages(MSG_DISMISS_POPUP);
    132         if (mPopup != null && mPopup.getVisibility() == View.VISIBLE) {
    133             mPopup.clearAnimation();
    134             mPopup.startAnimation(mFadeOut);
    135             mPopup.setVisibility(View.GONE);
    136             if (mListener != null) mListener.onShowIndicator(this, false);
    137             invalidate();
    138             // Indicator wheel needs to update the highlight indicator if this
    139             // is dismissed by MSG_DISMISS_POPUP.
    140             ((View) getParent()).invalidate();
    141             return true;
    142         }
    143         return false;
    144     }
    145 
    146     public AbstractSettingPopup getPopupWindow() {
    147         if (mPopup != null && mPopup.getVisibility() == View.VISIBLE) {
    148             return mPopup;
    149         } else {
    150             return null;
    151         }
    152     }
    153 
    154     public void reloadPreference() {
    155         if (mPopup != null) mPopup.reloadPreference();
    156     }
    157 
    158     protected void dismissPopupDelayed() {
    159         if (!mHandler.hasMessages(MSG_DISMISS_POPUP)) {
    160             mHandler.sendEmptyMessage(MSG_DISMISS_POPUP);
    161         }
    162     }
    163 
    164     private class MainHandler extends Handler {
    165         @Override
    166         public void handleMessage(Message msg) {
    167             switch (msg.what) {
    168                 case MSG_DISMISS_POPUP:
    169                     dismissPopup();
    170                     break;
    171             }
    172         }
    173     }
    174 }
    175