feat(material): early version of md-input

Closes #1753

modules/angular2_material/src/components/input/input.js

@@ -1,17 +1,126 @@
-import {Directive} from 'angular2/src/core/annotations_impl/annotations';
+import {Directive, onAllChangesDone} from 'angular2/src/core/annotations_impl/annotations';
+import {Attribute} from 'angular2/src/core/annotations_impl/di';
+import {Parent} from 'angular2/src/core/annotations_impl/visibility';
+
+import {ObservableWrapper, EventEmitter} from 'angular2/src/facade/async';
+
+// TODO(jelbourn): validation (will depend on Forms API).
+// TODO(jelbourn): textarea resizing
+// TODO(jelbourn): max-length counter
+// TODO(jelbourn): placeholder property
 
 @Directive({
-  selector: 'md-input-container input'
+  selector: 'md-input-container input',
+  events: ['mdChange', 'mdFocusChange'],
+  hostProperties: {
+    'yes': 'class.md-input'
+  },
+  hostListeners: {
+    'input': 'updateValue($event)',
+    'focus': 'setHasFocus(true)',
+    'blur': 'setHasFocus(false)'
+  }
 })
 export class MdInput {
-  constructor() {
+  value: string;
+  yes: boolean;
 
+  // Events emitted by this directive. We use these special 'md-' events to communicate
+  // to the parent MdInputContainer.
+  mdChange: EventEmitter;
+  mdFocusChange: EventEmitter;
+
+  constructor(
+      @Attribute('value') value: String,
+      @Parent() container: MdInputContainer) {
+    // TODO(jelbourn): Remove this when #1402 is done.
+    this.yes = true;
+
+    this.value = value == null ? '' : value;
+    this.mdChange = new EventEmitter();
+    this.mdFocusChange = new EventEmitter();
+
+    container.registerInput(this);
+  }
+
+  updateValue(event) {
+    this.value = event.target.value;
+    ObservableWrapper.callNext(this.mdChange, this.value);
+  }
+
+  setHasFocus(hasFocus: boolean) {
+    ObservableWrapper.callNext(this.mdFocusChange, hasFocus);
   }
 }
 
+@Directive({
+  selector: 'md-input-container textarea',
+  events: ['mdChange', 'mdFocusChange'],
+  hostProperties: {
+    'yes': 'class.md-input'
+  },
+  hostListeners: {
+    'input': 'updateValue($event)',
+    'focus': 'setHasFocus(true)',
+    'blur': 'setHasFocus(false)'
+  }
+})
+export class MdTextarea extends MdInput {
+  constructor(
+      @Attribute('value') value: String,
+      @Parent() container: MdInputContainer) {
+    super(value, container);
+  }
+}
 
 @Directive({
-  selector: 'md-input-container'
+  selector: 'md-input-container',
+  lifecycle: [onAllChangesDone],
+  hostProperties: {
+    'inputHasValue': 'class.md-input-has-value',
+    'inputHasFocus': 'class.md-input-focused'
+  }
 })
 export class MdInputContainer {
+  // The MdInput or MdTextarea inside of this container.
+  _input: MdInput;
+
+  // Whether the input inside of this container has a non-empty value.
+  inputHasValue: boolean;
+
+  // Whether the input inside of this container has focus.
+  inputHasFocus: boolean;
+
+  constructor() {
+    this._input = null;
+    this.inputHasValue = false;
+    this.inputHasFocus = false;
+  }
+
+  onAllChangesDone() {
+    // Enforce that this directive actually contains a text input.
+    if (this._input == null) {
+      throw 'No <input> or <textarea> found inside of <md-input-container>';
+    }
+  }
+
+  /** Registers the child MdInput or MdTextarea. */
+  registerInput(input) {
+    if (this._input != null) {
+      throw 'Only one text input is allowed per <md-input-container>.';
+    }
+
+    this._input = input;
+    this.inputHasValue = input.value != '';
+
+    // Listen to input changes and focus events so that we can apply the appropriate CSS
+    // classes based on the input state.
+    ObservableWrapper.subscribe(input.mdChange, value => {
+      this.inputHasValue = value != '';
+    });
+
+    ObservableWrapper.subscribe(input.mdFocusChange, hasFocus => {
+      this.inputHasFocus = hasFocus
+    });
+  }
 }