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      1 /*
      2  * Copyright (C) 2010 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.videoeditor;
     18 
     19 import android.app.ListActivity;
     20 import android.content.Intent;
     21 import android.os.Bundle;
     22 import android.view.View;
     23 import android.widget.ListView;
     24 import android.widget.TextView;
     25 
     26 /**
     27  * Activity that lists all transition effects for user to choose.
     28  */
     29 public class TransitionsActivity extends ListActivity {
     30     // Input transition category
     31     public static final String PARAM_AFTER_MEDIA_ITEM_ID = "media_item_id";
     32     public static final String PARAM_TRANSITION_ID = "transition_id";
     33     public static final String PARAM_MINIMUM_DURATION = "min_duration";
     34     public static final String PARAM_DEFAULT_DURATION = "default_duration";
     35     public static final String PARAM_MAXIMUM_DURATION = "max_duration";
     36 
     37     // Increment transition duration in milliseconds
     38     private static final long INCREMENT_TRANSITION = 100;
     39 
     40     // Output transition type
     41     public static final String PARAM_TRANSITION_TYPE = "transition";
     42     public static final String PARAM_TRANSITION_DURATION = "duration";
     43 
     44     // State keys
     45     private static final String STATE_KEY_TRANSITION_DURATION = "duration";
     46 
     47     // Instance variables
     48     private TextView mTransitionDurationView;
     49     private View mTransitionLeftBtn, mTransitionRightBtn;
     50     private TransitionsAdapter mAdapter;
     51     private long mMinTransitionDurationMs, mMaxTransitionDurationMs, mTransitionDurationMs;
     52 
     53     @Override
     54     public void onCreate(Bundle savedInstanceState) {
     55         super.onCreate(savedInstanceState);
     56         setContentView(R.layout.transition_list_view);
     57         setFinishOnTouchOutside(true);
     58 
     59         mTransitionDurationView = (TextView)findViewById(R.id.transition_duration);
     60         mTransitionLeftBtn = findViewById(R.id.duration_left);
     61         mTransitionRightBtn = findViewById(R.id.duration_right);
     62 
     63         mMinTransitionDurationMs = getIntent().getLongExtra(PARAM_MINIMUM_DURATION, 0);
     64         mMinTransitionDurationMs = (mMinTransitionDurationMs / INCREMENT_TRANSITION) *
     65             INCREMENT_TRANSITION;
     66 
     67         mMaxTransitionDurationMs = getIntent().getLongExtra(PARAM_MAXIMUM_DURATION, 0);
     68         mMaxTransitionDurationMs = (mMaxTransitionDurationMs / INCREMENT_TRANSITION) *
     69             INCREMENT_TRANSITION;
     70 
     71         if (savedInstanceState == null) {
     72             mTransitionDurationMs = getIntent().getLongExtra(PARAM_DEFAULT_DURATION, 0);
     73         } else {
     74             mTransitionDurationMs = savedInstanceState.getLong(STATE_KEY_TRANSITION_DURATION);
     75         }
     76         mTransitionDurationMs = (mTransitionDurationMs / INCREMENT_TRANSITION) *
     77             INCREMENT_TRANSITION;
     78 
     79         updateTransitionDuration();
     80 
     81         // Create the list adapter
     82         mAdapter = new TransitionsAdapter(this, getListView());
     83         setListAdapter(mAdapter);
     84 
     85         final int transitionType = getIntent().getIntExtra(PARAM_TRANSITION_TYPE, -1);
     86         if (transitionType >= 0) {
     87             // Select the current transition
     88             final TransitionType[] transitions = mAdapter.getTransitions();
     89             for (int i = 0; i < transitions.length; i++) {
     90                 if (transitions[i].getType() == transitionType) {
     91                     setSelection(i);
     92                     break;
     93                 }
     94             }
     95         }
     96     }
     97 
     98     @Override
     99     public void onPause() {
    100         super.onPause();
    101 
    102         if (mAdapter != null) {
    103             mAdapter.onPause();
    104         }
    105     }
    106 
    107     @Override
    108     public void onDestroy() {
    109         super.onDestroy();
    110 
    111         if (mAdapter != null) {
    112             mAdapter.onDestroy();
    113             mAdapter = null;
    114         }
    115     }
    116 
    117     @Override
    118     public void onSaveInstanceState(Bundle outState) {
    119         super.onSaveInstanceState(outState);
    120 
    121         outState.putLong(STATE_KEY_TRANSITION_DURATION, mTransitionDurationMs);
    122     }
    123 
    124     @Override
    125     public void onListItemClick(ListView l, View v, int position, long id) {
    126         final Intent extras = new Intent();
    127         extras.putExtra(PARAM_TRANSITION_TYPE,
    128                 ((TransitionType)mAdapter.getItem(position)).getType());
    129         extras.putExtra(PARAM_AFTER_MEDIA_ITEM_ID,
    130                 getIntent().getStringExtra(PARAM_AFTER_MEDIA_ITEM_ID));
    131         extras.putExtra(PARAM_TRANSITION_ID,
    132                 getIntent().getStringExtra(PARAM_TRANSITION_ID));
    133         extras.putExtra(PARAM_TRANSITION_DURATION, mTransitionDurationMs);
    134 
    135         setResult(RESULT_OK, extras);
    136         finish();
    137     }
    138 
    139     public void onClickHandler(View target) {
    140         switch (target.getId()) {
    141             case R.id.duration_left: {
    142                 if (mTransitionDurationMs > mMinTransitionDurationMs) {
    143                     mTransitionDurationMs -= INCREMENT_TRANSITION;
    144                     updateTransitionDuration();
    145                 }
    146                 break;
    147             }
    148 
    149             case R.id.duration_right: {
    150                 if (mTransitionDurationMs < mMaxTransitionDurationMs) {
    151                     mTransitionDurationMs += INCREMENT_TRANSITION;
    152                     updateTransitionDuration();
    153                 }
    154                 break;
    155             }
    156 
    157             default: {
    158                 break;
    159             }
    160         }
    161     }
    162 
    163     @Override
    164     public boolean onSearchRequested() {
    165         return false;
    166     }
    167 
    168     /**
    169      * Updates the transition duration and the state of the buttons.
    170      */
    171     private void updateTransitionDuration() {
    172         mTransitionDurationView.setText(getString(R.string.transitions_duration,
    173                 (((float)mTransitionDurationMs) / 1000)));
    174 
    175         mTransitionLeftBtn.setEnabled(mTransitionDurationMs > mMinTransitionDurationMs);
    176         mTransitionRightBtn.setEnabled(mTransitionDurationMs < mMaxTransitionDurationMs);
    177     }
    178 }
    179