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      1 /*
      2  * Copyright (C) 2014 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.widget;
     18 
     19 import android.content.Context;
     20 import android.util.AttributeSet;
     21 import android.util.SparseArray;
     22 import android.view.View;
     23 import android.widget.ImageButton;
     24 
     25 import com.android.camera.app.CameraAppUI;
     26 import com.android.camera.debug.Log;
     27 import com.android.camera2.R;
     28 
     29 /**
     30  * This is a custom image button that launches an external viewer. It changes its
     31  * image resource based on the current viewer type (photosphere, refocus, etc).
     32  * Also, it tracks whether it is shown by tracking the visibility change of all
     33  * its ancestors, and keep the visibility of the clings that are registered to the
     34  * button in sync.
     35  */
     36 public class ExternalViewerButton extends ImageButton {
     37     private static final Log.Tag TAG = new Log.Tag("ExtViewerButton");
     38     private int mState = CameraAppUI.BottomPanel.VIEWER_NONE;
     39     private final SparseArray<Cling> mClingMap;
     40 
     41     public ExternalViewerButton(Context context, AttributeSet attrs) {
     42         super(context, attrs);
     43         mClingMap = new SparseArray<Cling>();
     44         updateClingVisibility();
     45     }
     46 
     47     @Override
     48     protected void onVisibilityChanged(View v, int visibility) {
     49         super.onVisibilityChanged(v, visibility);
     50         if (mClingMap == null) {
     51             return;
     52         }
     53         updateClingVisibility();
     54     }
     55 
     56     /**
     57      * Sets cling of the given viewer type for external viewer button.
     58      */
     59     public void setClingForViewer(int viewerType, Cling cling) {
     60         if (cling == null) {
     61             Log.w(TAG, "Cannot set a null cling for viewer");
     62             return;
     63         }
     64         mClingMap.put(viewerType, cling);
     65         cling.setReferenceView(this);
     66     }
     67 
     68     /**
     69      * Clears cling of the given viewer type for external viewer button.
     70      */
     71     public void clearClingForViewer(int viewerType) {
     72         Cling cling = mClingMap.get(viewerType);
     73         if (cling == null) {
     74             Log.w(TAG, "Cling does not exist for the given viewer type: " + viewerType);
     75         }
     76         cling.setReferenceView(null);
     77         mClingMap.remove(viewerType);
     78     }
     79 
     80     /**
     81      * Returns a cling for the specified viewer type.
     82      */
     83     public Cling getClingForViewer(int viewerType) {
     84         return mClingMap.get(viewerType);
     85     }
     86 
     87     /**
     88      * Sets the current state of the button, which affects the visibility and image
     89      * resource of the button.
     90      */
     91     public void setState(int state) {
     92         mState = state;
     93         int newVisibility;
     94         if (state == CameraAppUI.BottomPanel.VIEWER_NONE) {
     95             newVisibility = View.GONE;
     96         } else {
     97             setImageResource(getViewButtonResource(state));
     98             newVisibility = View.VISIBLE;
     99         }
    100 
    101         if (newVisibility != getVisibility()) {
    102             setVisibility(newVisibility);
    103         } else if (newVisibility == View.VISIBLE){
    104             // If visibility has changed, cling visibility was updated already,
    105             // so only need to update it when visibility has not changed.
    106             updateClingVisibility();
    107         }
    108     }
    109 
    110     /**
    111      * Sets all the clings to be invisible.
    112      */
    113     public void hideClings() {
    114         for (int i = 0; i < mClingMap.size(); i++) {
    115             mClingMap.valueAt(i).setVisibility(View.INVISIBLE);
    116         }
    117     }
    118 
    119     /**
    120      * Gets the image resource for a specific state.
    121      */
    122     private int getViewButtonResource(int state) {
    123         switch (state) {
    124             case CameraAppUI.BottomPanel.VIEWER_REFOCUS:
    125                 return R.drawable.ic_refocus_normal;
    126             case CameraAppUI.BottomPanel.VIEWER_PHOTO_SPHERE:
    127                 return R.drawable.ic_view_photosphere;
    128             default:
    129                 return R.drawable.ic_control_play;
    130         }
    131     }
    132 
    133     /**
    134      * Updates the visibility of clings based on whether the button is currently
    135      * shown.
    136      */
    137     public void updateClingVisibility() {
    138         hideClings();
    139         if (isShown()) {
    140             Cling cling = mClingMap.get(mState);
    141             if (cling != null) {
    142                 cling.adjustPosition();
    143                 cling.setVisibility(View.VISIBLE);
    144             }
    145         }
    146     }
    147 }
    148