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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  * Copyright (C) 2016 Mopria Alliance, Inc.
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *      http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 
     18 package com.android.bips.ui;
     19 
     20 import android.annotation.SuppressLint;
     21 import android.app.AlertDialog;
     22 import android.content.Context;
     23 import android.os.Bundle;
     24 import android.text.Editable;
     25 import android.text.TextWatcher;
     26 import android.util.Log;
     27 import android.view.KeyEvent;
     28 import android.view.View;
     29 import android.view.Window;
     30 import android.view.WindowManager;
     31 import android.view.inputmethod.EditorInfo;
     32 import android.view.inputmethod.InputMethodManager;
     33 import android.widget.Button;
     34 import android.widget.ProgressBar;
     35 import android.widget.TextView;
     36 
     37 import com.android.bips.R;
     38 import com.android.bips.discovery.DiscoveredPrinter;
     39 import com.android.bips.discovery.ManualDiscovery;
     40 
     41 import java.util.regex.Matcher;
     42 import java.util.regex.Pattern;
     43 
     44 /**
     45  * Allows the user to enter printer address manually
     46  */
     47 class AddManualPrinterDialog extends AlertDialog implements TextWatcher,
     48         TextView.OnEditorActionListener, View.OnKeyListener {
     49     private static final String TAG = AddManualPrinterDialog.class.getSimpleName();
     50     private static final boolean DEBUG = false;
     51 
     52     /**
     53      * A regex that matches IP addresses and domain names like "192.168.1.101" and
     54      * "printer1.company.com"
     55      */
     56     private static final String NAME_IP_REGEX =
     57             "[a-zA-Z0-9]+(\\-[a-zA-Z0-9]+)*(\\.[a-zA-Z0-9]+(\\-[a-zA-Z0-9]+)*)*";
     58     private static final String HOSTNAME_REGEXP = "^" + NAME_IP_REGEX + "$";
     59     private static final Pattern HOSTNAME_PATTERN = Pattern.compile(HOSTNAME_REGEXP);
     60 
     61     private final ManualDiscovery mDiscovery;
     62     private TextView mHostnameView;
     63     private Button mAddButton;
     64     private ProgressBar mProgressBar;
     65 
     66     AddManualPrinterDialog(Context context, ManualDiscovery discovery) {
     67         super(context);
     68         mDiscovery = discovery;
     69     }
     70 
     71     @SuppressLint("InflateParams")
     72     @Override
     73     protected void onCreate(Bundle savedInstanceState) {
     74         if (DEBUG) Log.d(TAG, "onCreate");
     75         View view = getLayoutInflater().inflate(R.layout.manual_printer_add, null);
     76         setView(view);
     77         setTitle(R.string.add_manual_printer);
     78         setButton(AlertDialog.BUTTON_NEGATIVE, getContext().getString(android.R.string.cancel),
     79                 (OnClickListener) null);
     80         setButton(AlertDialog.BUTTON_POSITIVE, getContext().getString(R.string.add),
     81                 (OnClickListener) null);
     82 
     83         super.onCreate(savedInstanceState);
     84         mAddButton = getButton(AlertDialog.BUTTON_POSITIVE);
     85         mHostnameView = (TextView) findViewById(R.id.hostname);
     86         mProgressBar = (ProgressBar) findViewById(R.id.progress);
     87 
     88         mAddButton.setOnClickListener(view1 -> addPrinter());
     89 
     90         // Update add button as contents change
     91         mHostnameView.addTextChangedListener(this);
     92         mHostnameView.setOnEditorActionListener(this);
     93         mHostnameView.setOnKeyListener(this);
     94 
     95         // Force open keyboard if appropriate
     96         openKeyboard(mHostnameView);
     97 
     98         updateButtonState();
     99     }
    100 
    101     private void openKeyboard(TextView view) {
    102         Window window = getWindow();
    103         if (window != null) {
    104             window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
    105         }
    106 
    107         view.requestFocus();
    108         InputMethodManager imm = (InputMethodManager) getContext()
    109                 .getSystemService(Context.INPUT_METHOD_SERVICE);
    110         imm.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT);
    111     }
    112 
    113     private void updateButtonState() {
    114         String hostname = mHostnameView.getText().toString();
    115         Matcher hostMatch = HOSTNAME_PATTERN.matcher(hostname);
    116 
    117         mAddButton.setEnabled(hostMatch.matches());
    118     }
    119 
    120     /** Attempt to add the printer based on current data */
    121     private void addPrinter() {
    122         // Disable other actions while we are checking
    123         mAddButton.setEnabled(false);
    124         mHostnameView.setEnabled(false);
    125         mProgressBar.setVisibility(View.VISIBLE);
    126 
    127         // Begin an attempt to add the printer
    128         mDiscovery.addManualPrinter(mHostnameView.getText().toString(),
    129                 new ManualDiscovery.PrinterAddCallback() {
    130                     @Override
    131                     public void onFound(DiscoveredPrinter printer, boolean supported) {
    132                         if (supported) {
    133                             // Success case
    134                             dismiss();
    135                         } else {
    136                             error(getContext().getString(R.string.printer_not_supported));
    137                         }
    138                     }
    139 
    140                     @Override
    141                     public void onNotFound() {
    142                         error(getContext().getString(R.string.no_printer_found));
    143                     }
    144                 });
    145     }
    146 
    147     /** Inform user of error and allow them to correct it */
    148     private void error(String message) {
    149         mProgressBar.setVisibility(View.GONE);
    150         mHostnameView.setError(message);
    151         mHostnameView.setEnabled(true);
    152         openKeyboard(mHostnameView);
    153     }
    154 
    155     @Override
    156     public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
    157     }
    158 
    159     @Override
    160     public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
    161     }
    162 
    163     @Override
    164     public void afterTextChanged(Editable editable) {
    165         updateButtonState();
    166     }
    167 
    168     @Override
    169     public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
    170         if (id == EditorInfo.IME_ACTION_DONE && mAddButton.isEnabled()) {
    171             addPrinter();
    172             return true;
    173         }
    174         return false;
    175     }
    176 
    177     @Override
    178     public boolean onKey(View view, int keyCode, KeyEvent keyEvent) {
    179         if (keyCode == KeyEvent.KEYCODE_ENTER && mAddButton.isEnabled()) {
    180             addPrinter();
    181             return true;
    182         }
    183         return false;
    184     }
    185 }