feat(select): support disabling

src/demo-app/select/select-demo.html

@@ -1,11 +1,30 @@
 <div class="demo-select">
-  <md-select placeholder="Food" [formControl]="control" [required]="isRequired">
-    <md-option *ngFor="let food of foods" [value]="food.value"> {{ food.viewValue }} </md-option>
-  </md-select>
-  <p> Value: {{ control.value }} </p>
-  <p> Touched: {{ control.touched }} </p>
-  <p> Dirty: {{ control.dirty }} </p>
-  <p> Status: {{ control.status }} </p>
-  <button md-button (click)="control.setValue('pizza-1')">SET VALUE</button>
-  <button md-button (click)="isRequired=!isRequired">TOGGLE REQUIRED</button>
+  <md-card>
+    <md-select placeholder="Food" [formControl]="foodControl">
+      <md-option *ngFor="let food of foods" [value]="food.value"> {{ food.viewValue }} </md-option>
+    </md-select>
+    <p> Value: {{ foodControl.value }} </p>
+    <p> Touched: {{ foodControl.touched }} </p>
+    <p> Dirty: {{ foodControl.dirty }} </p>
+    <p> Status: {{ foodControl.status }} </p>
+    <button md-button (click)="foodControl.setValue('pizza-1')">SET VALUE</button>
+    <button md-button (click)="toggleDisabled()">TOGGLE DISABLED</button>
+  </md-card>
+
+  <md-card>
+    <md-select placeholder="Drink" [(ngModel)]="currentDrink" [required]="isRequired" [disabled]="isDisabled"
+      #drinkControl="ngModel">
+      <md-option *ngFor="let drink of drinks" [value]="drink.value" [disabled]="drink.disabled">
+        {{ drink.viewValue }}
+      </md-option>
+    </md-select>
+    <p> Value: {{ currentDrink }} </p>
+    <p> Touched: {{ drinkControl.touched }} </p>
+    <p> Dirty: {{ drinkControl.dirty }} </p>
+    <p> Status: {{ drinkControl.control?.status }} </p>
+    <button md-button (click)="currentDrink='sprite-1'">SET VALUE</button>
+    <button md-button (click)="isRequired=!isRequired">TOGGLE REQUIRED</button>
+    <button md-button (click)="isDisabled=!isDisabled">TOGGLE DISABLED</button>
+  </md-card>
+
 </div>

src/demo-app/select/select-demo.scss

@@ -1,2 +1,10 @@
 .demo-select {
+  display: flex;
+  flex-flow: row wrap;
+
+  md-card {
+    width: 450px;
+    margin: 24px;
+  }
+
 }

src/demo-app/select/select-demo.ts

@@ -9,13 +9,24 @@ import {FormControl} from '@angular/forms';
 })
 export class SelectDemo {
   isRequired = false;
+  isDisabled = false;
+  currentDrink: string;
+  foodControl = new FormControl('');
 
   foods = [
     {value: 'steak-0', viewValue: 'Steak'},
     {value: 'pizza-1', viewValue: 'Pizza'},
     {value: 'tacos-2', viewValue: 'Tacos'}
   ];
 
-  control = new FormControl('');
+  drinks = [
+    {value: 'coke-0', viewValue: 'Coke'},
+    {value: 'sprite-1', viewValue: 'Sprite', disabled: true},
+    {value: 'water-2', viewValue: 'Water'}
+  ];
+
+  toggleDisabled() {
+    this.foodControl.enabled ? this.foodControl.disable() : this.foodControl.enable();
+  }
 
 }

src/lib/core/style/_form-common.scss

@@ -0,0 +1,12 @@
+
+// Gradient for showing the dashed line when the input is disabled.
+// Unlike using a border, a gradient allows us to adjust the spacing of the dotted line
+// to match the Material Design spec.
+$md-underline-disabled-background-image:
+        linear-gradient(to right, rgba(0, 0, 0, 0.26) 0%, rgba(0, 0, 0, 0.26) 33%, transparent 0%);
+
+@mixin md-control-disabled-underline {
+  background-image: $md-underline-disabled-background-image;
+  background-size: 4px 1px;
+  background-repeat: repeat-x;
+}

src/lib/input/input.scss

@@ -1,4 +1,5 @@
 @import '../core/style/variables';
+@import '../core/style/form-common';
 
 
 $md-input-floating-placeholder-scale-factor: 0.75 !default;
@@ -149,11 +150,9 @@ md-input, md-textarea {
   border-top-style: solid;
 
   &.md-disabled {
+    @include md-control-disabled-underline();
     border-top: 0;
-    background-image: $md-input-underline-disabled-background-image;
     background-position: 0;
-    background-size: 4px 1px;
-    background-repeat: repeat-x;
   }
 
   .md-input-ripple {

src/lib/select/_select-theme.scss

@@ -11,12 +11,12 @@
     color: md-color($foreground, hint-text);
     border-bottom: 1px solid md-color($foreground, divider);
 
-    md-select:focus & {
+    md-select:focus:not(.md-select-disabled) & {
       color: md-color($primary);
       border-bottom: 1px solid md-color($primary);
     }
 
-    .ng-invalid.ng-touched & {
+    .ng-invalid.ng-touched:not(.md-select-disabled) & {
       color: md-color($warn);
       border-bottom: 1px solid md-color($warn);
     }
@@ -25,11 +25,11 @@
   .md-select-arrow {
     color: md-color($foreground, hint-text);
 
-    md-select:focus & {
+    md-select:focus:not(.md-select-disabled) & {
       color: md-color($primary);
     }
 
-    .ng-invalid.ng-touched & {
+    .ng-invalid.ng-touched:not(.md-select-disabled) & {
       color: md-color($warn);
     }
   }
@@ -40,10 +40,14 @@
 
   .md-select-value {
     color: md-color($foreground, text);
+
+    .md-select-disabled & {
+      color: md-color($foreground, hint-text);
+    }
   }
 
   md-option {
-    &:hover, &:focus {
+    &:hover:not(.md-option-disabled), &:focus:not(.md-option-disabled) {
      background: md-color($background, hover);
     }
 
@@ -52,5 +56,9 @@
       color: md-color($primary);
     }
 
+    &.md-option-disabled {
+      color: md-color($foreground, hint-text);
+    }
+
   }
 }

src/lib/select/option.html

@@ -1,3 +1,3 @@
 <ng-content></ng-content>
-<div class="md-option-ripple" md-ripple md-ripple-background-color="rgba(0,0,0,0)"
+<div class="md-option-ripple" *ngIf="!disabled" md-ripple md-ripple-background-color="rgba(0,0,0,0)"
      [md-ripple-trigger]="_getHostElement()"></div>

src/lib/select/option.ts

@@ -8,15 +8,18 @@ import {
   ViewEncapsulation
 } from '@angular/core';
 import {ENTER, SPACE} from '../core/keyboard/keycodes';
+import {coerceBooleanProperty} from '../core/coersion/boolean-property';
 
 @Component({
   moduleId: module.id,
   selector: 'md-option',
   host: {
     'role': 'option',
-    'tabindex': '0',
+    '[attr.tabindex]': '_getTabIndex()',
     '[class.md-selected]': 'selected',
     '[attr.aria-selected]': 'selected.toString()',
+    '[attr.aria-disabled]': 'disabled.toString()',
+    '[class.md-option-disabled]': 'disabled',
     '(click)': '_selectViaInteraction()',
     '(keydown)': '_handleKeydown($event)'
   },
@@ -25,11 +28,23 @@ import {ENTER, SPACE} from '../core/keyboard/keycodes';
   encapsulation: ViewEncapsulation.None
 })
 export class MdOption {
-  private _selected = false;
+  private _selected: boolean = false;
+
+  /** Whether the option is disabled.  */
+  private _disabled: boolean = false;
 
   /** The form value of the option. */
   @Input() value: any;
 
+  @Input()
+  get disabled() {
+    return this._disabled;
+  }
+
+  set disabled(value: any) {
+    this._disabled = coerceBooleanProperty(value);
+  }
+
   /** Event emitted when the option is selected. */
   @Output() onSelect = new EventEmitter();
 
@@ -72,13 +87,21 @@ export class MdOption {
     }
   }
 
+
   /**
    * Selects the option while indicating the selection came from the user. Used to
    * determine if the select's view -> model callback should be invoked.
    */
   _selectViaInteraction() {
-    this._selected = true;
-    this.onSelect.emit(true);
+    if (!this.disabled) {
+      this._selected = true;
+      this.onSelect.emit(true);
+    }
+  }
+
+  /** Returns the correct tabindex for the option depending on disabled state. */
+  _getTabIndex() {
+    return this.disabled ? '-1' : '0';
   }
 
   _getHostElement(): HTMLElement {

src/lib/select/select.scss

@@ -1,4 +1,5 @@
 @import '../core/style/menu-common';
+@import '../core/style/form-common';
 
 $md-select-trigger-height: 30px !default;
 $md-select-trigger-min-width: 112px !default;
@@ -16,6 +17,14 @@ md-select {
   height: $md-select-trigger-height;
   min-width: $md-select-trigger-min-width;
   cursor: pointer;
+
+  [aria-disabled='true'] & {
+    @include md-control-disabled-underline();
+    border-bottom: transparent;
+    background-position: 0 bottom;
+    cursor: default;
+    user-select: none;
+  }
 }
 
 .md-select-placeholder {
@@ -56,6 +65,11 @@ md-option {
   position: relative;
   cursor: pointer;
   outline: none;
+
+  &[aria-disabled='true'] {
+    cursor: default;
+    user-select: none;
+  }
 }
 
 .md-option-ripple {