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| 1 <!-- |
| 2 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 3 // Use of this source code is governed by a BSD-style license that can be |
| 4 // found in the LICENSE file. |
| 5 --> |
| 6 <import src="/sky/framework/sky-element.sky" /> |
| 7 <import src="/sky/framework/sky-scrollable.sky" /> |
| 8 <sky-element> |
| 9 <template> |
| 10 <style> |
| 11 #control { |
| 12 height: -webkit-fill-available; |
| 13 background-color: black; |
| 14 color: rgb(255, 191, 0); |
| 15 font-family: 'Courier', 'monospace'; |
| 16 } |
| 17 span { |
| 18 white-space: nowrap; |
| 19 } |
| 20 </style> |
| 21 <sky-scrollable id="control" contenteditable /> |
| 22 </template> |
| 23 <script> |
| 24 import 'dart:async'; |
| 25 import 'dart:core'; |
| 26 import 'dart:sky'; |
| 27 import 'package:examples/echo_terminal/terminal_client.mojom.dart' as terminal; |
| 28 import '/sky/framework/embedder.dart'; |
| 29 import 'terminal_display.dart'; |
| 30 import 'terminal_file_impl.dart'; |
| 31 |
| 32 // Implements the <terminal> element, which implements a "terminal display". Has |
| 33 // an |url| attribute, whose value should be a Mojo app that provides the |
| 34 // |terminal.TerminalClient| service. |
| 35 @Tagname('terminal') |
| 36 class TerminalDisplayImpl extends SkyElement implements TerminalDisplay { |
| 37 Element _control; |
| 38 |
| 39 // Queue of unconsumed input (keystrokes), with the head at index 0. |
| 40 // Keystrokes end up here if there's no reader (i.e., |getChar()|) pending, |
| 41 // i.e., if |_readerQueue| is empty. Invariant: At most one of |_inputQueue| |
| 42 // and |_readerQueue| may be nonempty at any given time. |
| 43 List<int> _inputQueue; |
| 44 |
| 45 // Queue of things waiting for input, with the head at index 0. If a keystroke |
| 46 // is received and this is nonempty, the head is given that keystroke (and |
| 47 // dequeued). |
| 48 List<Completer<int>> _readerQueue; |
| 49 |
| 50 TerminalDisplayImpl() |
| 51 : _inputQueue = new List<int>(), |
| 52 _readerQueue = new List<Completer<int>>() { |
| 53 } |
| 54 |
| 55 void shadowRootReady() { |
| 56 _control = shadowRoot.getElementById('control'); |
| 57 _control.addEventListener('keypress', _handleKeyPress); |
| 58 |
| 59 // Initialize with the first line. |
| 60 _newLine(); |
| 61 |
| 62 _connect(getAttribute('url')); |
| 63 } |
| 64 |
| 65 void _handleKeyPress(KeyboardEvent event) { |
| 66 // TODO(vtl): Add "echo" mode; do |putChar(event.charCode);| if echo is on. |
| 67 |
| 68 if (_readerQueue.isEmpty) { |
| 69 _inputQueue.add(event.charCode); |
| 70 } else { |
| 71 _readerQueue.removeAt(0).complete(event.charCode); |
| 72 } |
| 73 |
| 74 event.preventDefault(); |
| 75 } |
| 76 |
| 77 void _newLine() { |
| 78 _control.appendChild(document.createElement('span')); |
| 79 } |
| 80 |
| 81 // TODO(vtl): Should we always auto-connect? Should there be facilities for |
| 82 // programmatically connecting? (What if the |url| attribute isn't set?) |
| 83 void _connect(String url) { |
| 84 var terminalClient = new terminal.TerminalClientProxy.unbound(); |
| 85 embedder.connectToService(url, terminalClient); |
| 86 terminalClient.ptr.connectToTerminal(new TerminalFileImpl(this).stub); |
| 87 terminalClient.close(); |
| 88 } |
| 89 |
| 90 // |TerminalDisplay| implementation: |
| 91 |
| 92 @override |
| 93 void putChar(int byte) { |
| 94 if (byte == 10 || byte == 13) { |
| 95 _newLine(); |
| 96 return; |
| 97 } |
| 98 _control.lastChild.textContent += new String.fromCharCode(byte); |
| 99 } |
| 100 |
| 101 @override |
| 102 Future<int> getChar() async { |
| 103 if (_inputQueue.isNotEmpty) { |
| 104 return new Future.value(_inputQueue.removeAt(0)); |
| 105 } |
| 106 |
| 107 var completer = new Completer<int>(); |
| 108 _readerQueue.add(completer); |
| 109 return completer.future; |
| 110 } |
| 111 } |
| 112 |
| 113 _init(script) => register(script, TerminalDisplayImpl); |
| 114 </script> |
| 115 </sky-element> |
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