1 /*
2  * Copyright (C) 2018 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.example.android.intentplayground;
17 
18 import android.content.Context;
19 import android.view.LayoutInflater;
20 import android.view.View;
21 import android.view.ViewGroup;
22 import android.widget.Button;
23 import android.widget.TextView;
24 
25 import androidx.viewpager.widget.PagerAdapter;
26 
27 import java.util.List;
28 
29 /**
30  * A {@link PagerAdapter} for {@link ShowcaseFragment} that handles the creation of Views based
31  * on a list of {@link com.example.android.intentplayground.ShowcaseFragment.Step}.
32  */
33 class StepAdapter extends PagerAdapter {
34     private final Context mContext;
35     private View.OnClickListener mNextCallback;
36     private View.OnClickListener mCancelCallback;
37     private View.OnClickListener mFinishCallback;
38     private List<ShowcaseFragment.Step> mSteps;
39     private LayoutInflater mInflater;
40 
41     /**
42      * Constructs a new StepAdapter.
43      * @param context The context that holds this adapter.
44      * @param steps A list of {@link com.example.android.intentplayground.ShowcaseFragment.Step}s
45      */
StepAdapter(Context context, List<ShowcaseFragment.Step> steps)46     public StepAdapter(Context context, List<ShowcaseFragment.Step> steps) {
47         mContext = context;
48         mSteps = steps;
49         mInflater = LayoutInflater.from(mContext);
50     }
51 
52     /**
53      * Set the callbacks to be run when pager buttons are clicked.
54      * @param finish The method to run when the finish action is requested.
55      * @param cancel The method to run when the cancel action is requested.
56      * @param next The method to run when the next action is requested.
57      */
setButtonCallbacks(View.OnClickListener finish, View.OnClickListener cancel, View.OnClickListener next)58     public void setButtonCallbacks(View.OnClickListener finish, View.OnClickListener cancel,
59                                    View.OnClickListener next) {
60         mFinishCallback = finish;
61         mCancelCallback = cancel;
62         mNextCallback = next;
63     }
64 
65     @Override
instantiateItem(ViewGroup container, int position)66     public Object instantiateItem(ViewGroup container, int position) {
67         ShowcaseFragment.Step currentStep = getStep(position);
68         ViewGroup skeletonLayout = (ViewGroup) mInflater
69                 .inflate(R.layout.showcase_skeleton, container, false /* attachToRoot */);
70         TextView tutorialText = skeletonLayout.findViewById(R.id.tutorial_text);
71         tutorialText.setText(mContext.getString(currentStep.tutorialText));
72         Button cancelButton = skeletonLayout.findViewById(R.id.cancel_pager);
73         Button nextButton = skeletonLayout.findViewById(R.id.next_pager);
74         if (position == getCount() - 1) {
75             // last item, adjust button bar
76             cancelButton.setVisibility(View.GONE);
77             nextButton.setText(R.string.help_step_finish);
78             nextButton.setOnClickListener(mFinishCallback);
79         } else {
80             cancelButton.setOnClickListener(mCancelCallback);
81             nextButton.setOnClickListener(mNextCallback);
82         }
83         container.addView(skeletonLayout);
84         return skeletonLayout;
85     }
86 
87     @Override
destroyItem(ViewGroup container, int position, Object view)88     public void destroyItem(ViewGroup container, int position, Object view) {
89         container.removeView((View) view);
90     }
91 
getStep(int i)92     public ShowcaseFragment.Step getStep(int i) {
93         return mSteps.get(i);
94     }
95 
96     @Override
getCount()97     public int getCount() {
98         return mSteps.size();
99     }
100 
101     @Override
isViewFromObject(View view, Object o)102     public boolean isViewFromObject(View view, Object o) {
103         return view.equals(o);
104     }
105 }
106