[NG] clrInput and form control validation components (#2295)

* Renamed FormControlService and WrappedFormControl
* Added ClrInput, ClrInputContainer for tracking input control states
* Added ClrControlHelper and ClrControlError for validation
* Added ClrIfError directive to conditionally display error messages

Signed-off-by: Jeremy Wilken <gnomation@gnomeontherun.com>

CODING_GUIDELINES.md

@@ -150,6 +150,7 @@ ClrFormsModule
 * Have related components (like parent / child) communicate by default through services.
 * Never use explicitly named template reference variables as part of the API, to query them through `@ContentChild`. Simply receive structural directives or inputs.
 * Never make HTTP calls, and never impose formatting constraints on their backend API.
+* In cases where a directive cannot be used unless it is a child of another directive, it is usually best to throw a new Error in the constructor to alert developers that it is not supported. [Example](src/clr-angular/popover/dropdown/dropdown-menu.ts)
 
 Finally, and this is harder to put in black-or-white terms, keep the API as simple and natural as possible, even if it means more work on Clarity's side. Implementing multiple directives and components and making them communicate through services will lead to a much more pleasant integration than forcing your consumer to pass data manually from one to the other. Here are a couple examples of what to do and not to do (taken from real-life carousel components):
 

src/clr-angular/forms/checkbox/checkbox-container.spec.ts

@@ -7,8 +7,7 @@ import { Component } from '@angular/core';
 import { ComponentFixture, TestBed } from '@angular/core/testing';
 import { By } from '@angular/platform-browser';
 
-import { FormControlService } from '../common/form-control.service';
-
+import { ControlIdService } from '../common/providers/control-id.service';
 import { ClrCheckboxContainer } from './checkbox-container';
 
 @Component({
@@ -23,7 +22,7 @@ class SimpleTest {}
 
 interface TestContext {
   fixture: ComponentFixture<SimpleTest>;
-  formControlService: FormControlService;
+  controlIdService: ControlIdService;
   checkboxContainer: ClrCheckboxContainer;
   checkboxContainerEl: any;
 }
@@ -35,13 +34,13 @@ export default function(): void {
       this.fixture = TestBed.createComponent(SimpleTest);
       this.fixture.detectChanges();
       const checkboxContainerDE = this.fixture.debugElement.query(By.directive(ClrCheckboxContainer));
-      this.formControlService = checkboxContainerDE.injector.get(FormControlService, null);
+      this.controlIdService = checkboxContainerDE.injector.get(ControlIdService, null);
       this.checkboxContainer = checkboxContainerDE.componentInstance;
       this.checkboxContainerEl = checkboxContainerDE.nativeElement;
     });
 
-    it('declares a FormControlService provider', function(this: TestContext) {
-      expect(this.formControlService).toBeTruthy();
+    it('declares a ControlIdService provider', function(this: TestContext) {
+      expect(this.controlIdService).toBeTruthy();
     });
 
     it('implements DynamicWrapper', function(this: TestContext) {

src/clr-angular/forms/checkbox/checkbox-container.ts

@@ -7,7 +7,7 @@
 import { Component } from '@angular/core';
 
 import { DynamicWrapper } from '../../utils/host-wrapping/dynamic-wrapper';
-import { FormControlService } from '../common/form-control.service';
+import { ControlIdService } from '../common/providers/control-id.service';
 
 @Component({
   selector: 'clr-checkbox-container',
@@ -18,7 +18,7 @@ import { FormControlService } from '../common/form-control.service';
         <label *ngIf="_dynamic"></label>
     `,
   host: { '[class.checkbox]': 'true' },
-  providers: [FormControlService],
+  providers: [ControlIdService],
 })
 export class ClrCheckboxContainer implements DynamicWrapper {
   // Indicates whether the container is dynamically created by the checkbox input itself

src/clr-angular/forms/checkbox/checkbox.spec.ts

@@ -6,8 +6,8 @@
 import { Component } from '@angular/core';
 import { TestBed } from '@angular/core/testing';
 import { By } from '@angular/platform-browser';
-import { FormControlService } from '../common/form-control.service';
-import { WrappedFormControl } from '../common/wrapped-form-control';
+import { ControlIdService } from '../common/providers/control-id.service';
+import { WrappedFormControl } from '../common/wrapped-control';
 import { ClrCheckboxNext } from './checkbox';
 import { ClrCheckboxContainer } from './checkbox-container';
 
@@ -22,7 +22,7 @@ export default function(): void {
   describe('Checkbox directive', () => {
     it('correctly extends WrappedFormControl<ClrCheckboxContainer>', function() {
       spyOn(WrappedFormControl.prototype, 'ngOnInit');
-      TestBed.configureTestingModule({ declarations: [ClrCheckboxNext, SimpleTest], providers: [FormControlService] });
+      TestBed.configureTestingModule({ declarations: [ClrCheckboxNext, SimpleTest], providers: [ControlIdService] });
       this.fixture = TestBed.createComponent(SimpleTest);
       this.fixture.detectChanges();
       expect(

src/clr-angular/forms/checkbox/checkbox.ts

@@ -6,7 +6,7 @@
 
 import { Directive, ViewContainerRef } from '@angular/core';
 
-import { WrappedFormControl } from '../common/wrapped-form-control';
+import { WrappedFormControl } from '../common/wrapped-control';
 
 import { ClrCheckboxContainer } from './checkbox-container';
 

src/clr-angular/forms/common/all.spec.ts

@@ -11,13 +11,23 @@
  */
 
 import CommonSpecs from './common.spec';
-import FormControlServiceSpecs from './form-control.service.spec';
+import ErrorSpecs from './error.spec';
+import HelperSpecs from './helper.spec';
+import ControlStatusServiceSpecs from './if-error/if-error.service.spec';
+import IfErrorSpecs from './if-error/if-error.spec';
 import LabelSpecs from './label.spec';
-import WrappedFormControlSpecs from './wrapped-form-control.spec';
+import ControlIdServiceSpecs from './providers/control-id.service.spec';
+import NgControlServiceSpecs from './providers/ng-control.service.spec';
+import WrappedControlSpecs from './wrapped-control.spec';
 
 describe('Forms common utilities', function() {
-  FormControlServiceSpecs();
+  ControlIdServiceSpecs();
+  ControlStatusServiceSpecs();
+  NgControlServiceSpecs();
   LabelSpecs();
-  WrappedFormControlSpecs();
+  IfErrorSpecs();
+  WrappedControlSpecs();
   CommonSpecs();
+  ErrorSpecs();
+  HelperSpecs();
 });

src/clr-angular/forms/common/common.module.ts

@@ -7,7 +7,14 @@
 import { CommonModule } from '@angular/common';
 import { NgModule } from '@angular/core';
 
+import { ClrControlError } from './error';
+import { ClrControlHelper } from './helper';
+import { ClrIfError } from './if-error/if-error';
 import { ClrLabel } from './label';
 
-@NgModule({ imports: [CommonModule], declarations: [ClrLabel], exports: [ClrLabel] })
+@NgModule({
+  imports: [CommonModule],
+  declarations: [ClrLabel, ClrControlError, ClrControlHelper, ClrIfError],
+  exports: [ClrLabel, ClrControlError, ClrControlHelper, ClrIfError],
+})
 export class ClrCommonFormsModule {}

src/clr-angular/forms/common/common.spec.ts

@@ -11,8 +11,8 @@ import { DynamicWrapper } from '../../utils/host-wrapping/dynamic-wrapper';
 import { ClrHostWrappingModule } from '../../utils/host-wrapping/host-wrapping.module';
 
 import { ClrCommonFormsModule } from './common.module';
-import { FormControlService } from './form-control.service';
-import { WrappedFormControl } from './wrapped-form-control';
+import { ControlIdService } from './providers/control-id.service';
+import { WrappedFormControl } from './wrapped-control';
 
 /*
  * Components representing generic form controls.
@@ -24,7 +24,7 @@ import { WrappedFormControl } from './wrapped-form-control';
         <ng-content></ng-content>
         <label id="container-view-label-after"></label>
     `,
-  providers: [FormControlService],
+  providers: [ControlIdService],
 })
 class GenericWrapper implements DynamicWrapper {
   _dynamic = false;
@@ -61,7 +61,6 @@ class NoWrapperWithId {}
             <input genericControl />
             <label id="test-view-label-after"></label>
         </generic-wrapper>
-        
     `,
 })
 class WithWrapperNoId {}
@@ -87,7 +86,7 @@ export default function(): void {
         fixture.detectChanges();
         if (!expectedId) {
           const wrapperDebug = fixture.debugElement.query(By.directive(GenericWrapper));
-          expectedId = wrapperDebug.injector.get(FormControlService).id;
+          expectedId = wrapperDebug.injector.get(ControlIdService).id;
         }
         const input = fixture.nativeElement.querySelector('input');
         expect(input.getAttribute('id')).toBe(expectedId, 'input has the wrong id attribute');

src/clr-angular/forms/common/error.spec.ts

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2016-2018 VMware, Inc. All Rights Reserved.
+ * This software is released under MIT license.
+ * The full license information can be found in LICENSE in the root directory of this project.
+ */
+import { Component } from '@angular/core';
+import { TestBed } from '@angular/core/testing';
+import { By } from '@angular/platform-browser';
+
+import { ClrControlError } from './error';
+
+@Component({ template: `<clr-control-error>Test error</clr-control-error>` })
+class SimpleTest {}
+
+export default function(): void {
+  describe('ClrControlError', () => {
+    let fixture;
+
+    beforeEach(function() {
+      TestBed.configureTestingModule({ declarations: [ClrControlError, SimpleTest] });
+      fixture = TestBed.createComponent(SimpleTest);
+      fixture.detectChanges();
+    });
+
+    it('projects content', function() {
+      expect(fixture.debugElement.query(By.directive(ClrControlError)).nativeElement.innerText).toContain('Test error');
+    });
+
+    it('adds the .clr-subtext class to host', function() {
+      expect(
+        fixture.debugElement.query(By.directive(ClrControlError)).nativeElement.classList.contains('clr-subtext')
+      ).toBeTrue();
+    });
+  });
+}

src/clr-angular/forms/common/error.ts

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2016-2018 VMware, Inc. All Rights Reserved.
+ * This software is released under MIT license.
+ * The full license information can be found in LICENSE in the root directory of this project.
+ */
+
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'clr-control-error',
+  template: `
+    <ng-content></ng-content>
+    `,
+  host: { '[class.clr-subtext]': 'true' },
+})
+export class ClrControlError {}

src/clr-angular/forms/common/helper.spec.ts

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2016-2018 VMware, Inc. All Rights Reserved.
+ * This software is released under MIT license.
+ * The full license information can be found in LICENSE in the root directory of this project.
+ */
+import { Component } from '@angular/core';
+import { TestBed } from '@angular/core/testing';
+import { By } from '@angular/platform-browser';
+
+import { ClrControlHelper } from './helper';
+
+@Component({ template: `<clr-control-helper>Test helper</clr-control-helper>` })
+class SimpleTest {}
+
+export default function(): void {
+  describe('ClrControlHelper', () => {
+    let fixture;
+
+    beforeEach(function() {
+      TestBed.configureTestingModule({ declarations: [ClrControlHelper, SimpleTest] });
+      fixture = TestBed.createComponent(SimpleTest);
+      fixture.detectChanges();
+    });
+
+    it('projects content', function() {
+      expect(fixture.debugElement.query(By.directive(ClrControlHelper)).nativeElement.innerText).toContain(
+        'Test helper'
+      );
+    });
+
+    it('adds the .clr-subtext class to host', function() {
+      expect(
+        fixture.debugElement.query(By.directive(ClrControlHelper)).nativeElement.classList.contains('clr-subtext')
+      ).toBeTrue();
+    });
+  });
+}

src/clr-angular/forms/common/helper.ts

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2016-2018 VMware, Inc. All Rights Reserved.
+ * This software is released under MIT license.
+ * The full license information can be found in LICENSE in the root directory of this project.
+ */
+
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'clr-control-helper',
+  template: `
+    <ng-content></ng-content>
+    `,
+  host: { '[class.clr-subtext]': 'true' },
+})
+export class ClrControlHelper {}

src/clr-angular/forms/common/if-error/if-error.service.spec.ts

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2016-2018 VMware, Inc. All Rights Reserved.
+ * This software is released under MIT license.
+ * The full license information can be found in LICENSE in the root directory of this project.
+ */
+import { FormControl } from '@angular/forms';
+
+import { NgControlService } from '../providers/ng-control.service';
+
+import { IfErrorService } from './if-error.service';
+
+export default function(): void {
+  describe('IfErrorService', function() {
+    let service, ngControlService, testControl;
+
+    beforeEach(() => {
+      testControl = new FormControl(true);
+      ngControlService = new NgControlService();
+      service = new IfErrorService(ngControlService);
+    });
+
+    it('subscribes to the statusChanges when the control is emitted', () => {
+      spyOn(testControl.statusChanges, 'subscribe').and.callThrough();
+      ngControlService.setControl(testControl);
+      expect(testControl.statusChanges.subscribe).toHaveBeenCalled();
+    });
+
+    it('provides observable for statusChanges, passing the control', () => {
+      const cb = jasmine.createSpy('cb');
+      const sub = service.statusChanges.subscribe(control => cb(control));
+      ngControlService.setControl(testControl);
+      // Change the state of the input to trigger statusChange
+      testControl.markAsTouched();
+      testControl.updateValueAndValidity();
+      expect(cb).toHaveBeenCalled();
+      expect(cb).toHaveBeenCalledWith(testControl);
+      sub.unsubscribe();
+    });
+
+    it('should allow a manual trigger of status observable', () => {
+      const cb = jasmine.createSpy('cb');
+      const sub = service.statusChanges.subscribe(control => cb(control));
+      ngControlService.setControl(testControl);
+      // Manually trigger status check
+      service.triggerStatusChange();
+      expect(cb).toHaveBeenCalled();
+      expect(cb).toHaveBeenCalledWith(testControl);
+      sub.unsubscribe();
+    });
+
+    it('should not fire status changes if control is untouched', () => {
+      const cb = jasmine.createSpy('cb');
+      const sub = service.statusChanges.subscribe(control => cb(control));
+      ngControlService.setControl(testControl);
+      // Change state of the input, should only fire when touched
+      testControl.markAsDirty();
+      testControl.updateValueAndValidity();
+      expect(cb).not.toHaveBeenCalled();
+      sub.unsubscribe();
+    });
+  });
+}