Refactor the hierarchy of NavigationMode classes.

src/index.ts

@@ -21,8 +21,11 @@ export {FreeNavigationMode} from './lib/navigation/free-navigation-mode';
 export {NavigationMode} from './lib/navigation/navigation-mode.interface';
 export {SemiStrictNavigationMode} from './lib/navigation/semi-strict-navigation-mode';
 export {StrictNavigationMode} from './lib/navigation/strict-navigation-mode';
+export {BaseNavigationMode} from './lib/navigation/base-navigation-mode.interface';
 export {WizardState} from './lib/navigation/wizard-state.model';
-export {navigationModeFactory} from './lib/navigation/navigation-mode.provider';
+export {NavigationModeInput} from './lib/navigation/navigation-mode-input.interface';
+export {NavigationModeFactory} from './lib/navigation/navigation-mode-factory.interface';
+export {BaseNavigationModeFactory} from './lib/navigation/base-navigation-mode-factory.provider';
 
 // export the utility functions
 export {MovingDirection} from './lib/util/moving-direction.enum';
@@ -34,4 +37,4 @@ export {WizardCompletionStep} from './lib/util/wizard-completion-step.interface'
 export {WizardStep} from './lib/util/wizard-step.interface';
 
 // export the module
-export {ArchwizardModule} from './lib/archwizard.module';
+export {ArchwizardModule, ArchwizardModuleConfig} from './lib/archwizard.module';

src/lib/archwizard.module.ts

@@ -15,6 +15,25 @@ import {WizardCompletionStepDirective} from './directives/wizard-completion-step
 import {WizardStepSymbolDirective} from './directives/wizard-step-symbol.directive';
 import {WizardStepTitleDirective} from './directives/wizard-step-title.directive';
 import {WizardStepDirective} from './directives/wizard-step.directive';
+import {NAVIGATION_MODE_FACTORY, NavigationModeFactory} from './navigation/navigation-mode-factory.interface';
+import {BaseNavigationModeFactory} from './navigation/base-navigation-mode-factory.provider';
+
+
+/**
+ * Configuration object for the `angular-archwizard` module.
+ *
+ * Allows to customize global settings.
+ */
+export interface ArchwizardModuleConfig {
+
+  /**
+   * Custom factory of [[NavigationMode]] instances.
+   *
+   * You may need a custom factory in order to support custom navigation modes.
+   * By default, [[BaseNavigationModeFactory]] is used.
+   */
+  navigationModeFactory?: NavigationModeFactory;
+}
 
 /**
  * The module defining all the content inside `angular-archwizard`
@@ -62,7 +81,12 @@ import {WizardStepDirective} from './directives/wizard-step.directive';
 })
 export class ArchwizardModule {
   /* istanbul ignore next */
-  static forRoot(): ModuleWithProviders {
-    return {ngModule: ArchwizardModule, providers: []};
+  public static forRoot(config?: ArchwizardModuleConfig): ModuleWithProviders {
+    return {
+      ngModule: ArchwizardModule,
+      providers: [
+        { provide: NAVIGATION_MODE_FACTORY, useValue: config && config.navigationModeFactory || new BaseNavigationModeFactory() },
+      ]
+    };
   }
 }

src/lib/components/wizard-completion-step.component.spec.ts

@@ -5,7 +5,6 @@ import {ArchwizardModule} from '../archwizard.module';
 import {NavigationMode} from '../navigation/navigation-mode.interface';
 import {WizardState} from '../navigation/wizard-state.model';
 import {MovingDirection} from '../util/moving-direction.enum';
-import {WizardCompletionStepComponent} from './wizard-completion-step.component';
 
 @Component({
   selector: 'aw-test-wizard',
@@ -29,11 +28,11 @@ class WizardTestComponent {
 
   public eventLog: Array<string> = [];
 
-  enterInto(direction: MovingDirection, destination: number): void {
+  public enterInto(direction: MovingDirection, destination: number): void {
     this.eventLog.push(`enter ${MovingDirection[direction]} ${destination}`);
   }
 
-  exitFrom(direction: MovingDirection, source: number): void {
+  public exitFrom(direction: MovingDirection, source: number): void {
     this.eventLog.push(`exit ${MovingDirection[direction]} ${source}`);
   }
 }

src/lib/components/wizard-step.component.spec.ts

@@ -5,7 +5,6 @@ import {ArchwizardModule} from '../archwizard.module';
 import {NavigationMode} from '../navigation/navigation-mode.interface';
 import {WizardState} from '../navigation/wizard-state.model';
 import {MovingDirection} from '../util/moving-direction.enum';
-import {WizardStepComponent} from './wizard-step.component';
 
 @Component({
   selector: 'aw-test-wizard',
@@ -29,11 +28,11 @@ class WizardTestComponent {
 
   public eventLog: Array<string> = [];
 
-  enterInto(direction: MovingDirection, destination: number): void {
+  public enterInto(direction: MovingDirection, destination: number): void {
     this.eventLog.push(`enter ${MovingDirection[direction]} ${destination}`);
   }
 
-  exitFrom(direction: MovingDirection, source: number): void {
+  public exitFrom(direction: MovingDirection, source: number): void {
     this.eventLog.push(`exit ${MovingDirection[direction]} ${source}`);
   }
 }

src/lib/components/wizard.component.spec.ts

@@ -40,7 +40,7 @@ class WizardTestComponent implements AfterViewInit {
   constructor(private _changeDetectionRef: ChangeDetectorRef) {
   }
 
-  ngAfterViewInit(): void {
+  public ngAfterViewInit(): void {
     // Force another change detection in order to fix an occuring ExpressionChangedAfterItHasBeenCheckedError
     this._changeDetectionRef.detectChanges();
   }

src/lib/components/wizard.component.ts

@@ -7,9 +7,14 @@ import {
   OnChanges,
   QueryList,
   SimpleChanges,
-  ViewEncapsulation
+  ViewEncapsulation,
+  Inject,
+  Optional
 } from '@angular/core';
 import {NavigationMode} from '../navigation/navigation-mode.interface';
+import {NavigationModeInput} from '../navigation/navigation-mode-input.interface';
+import {NavigationModeFactory, NAVIGATION_MODE_FACTORY} from '../navigation/navigation-mode-factory.interface';
+import {BaseNavigationModeFactory} from '../navigation/base-navigation-mode-factory.provider';
 import {WizardState} from '../navigation/wizard-state.model';
 import {WizardStep} from '../util/wizard-step.interface';
 
@@ -85,10 +90,20 @@ export class WizardComponent implements OnChanges, AfterContentInit {
 
   /**
    * The navigation mode used for transitioning between different steps.
-   * The navigation mode can be either `strict`, `semi-strict` or `free`
+   *
+   * The input value can be either a navigation mode name or a function.
+   *
+   * A set of supported mode names is determined by the configured navigation mode factory.
+   * The default navigation mode factory recognizes `strict`, `semi-strict` and `free`.
+   *
+   * If the value is a function, the function will be called during the initialization of the wizard
+   * component and must return an instance of [[NavigationMode]] to be used in the component.
+   *
+   * If the input is not configured or set to a falsy value, a default mode will be chosen by the navigation mode factory.
+   * For the default navigation mode factory, the default mode is `strict`.
    */
   @Input()
-  public navigationMode = 'strict';
+  public navigationMode: NavigationModeInput;
 
   /**
    * The initially selected step, represented by its index
@@ -106,8 +121,15 @@ export class WizardComponent implements OnChanges, AfterContentInit {
    * Constructor
    *
    * @param model The model for this wizard component
+   * @param navigationModeFactory Navigation mode factory for this wizard component
    */
-  constructor(public model: WizardState) {
+  constructor(
+    public model: WizardState,
+    // Using @Optional() in order not to break applications which import ArchwizardModule without calling forRoot().
+    @Optional() @Inject(NAVIGATION_MODE_FACTORY) private navigationModeFactory: NavigationModeFactory) {
+    if (!this.navigationModeFactory) {
+      this.navigationModeFactory = new BaseNavigationModeFactory();
+    }
   }
 
   /**
@@ -144,7 +166,7 @@ export class WizardComponent implements OnChanges, AfterContentInit {
    *
    * @param changes The detected changes
    */
-  ngOnChanges(changes: SimpleChanges) {
+  public ngOnChanges(changes: SimpleChanges) {
     for (const propName of Object.keys(changes)) {
       const change = changes[propName];
 
@@ -157,7 +179,7 @@ export class WizardComponent implements OnChanges, AfterContentInit {
             this.model.disableNavigationBar = change.currentValue;
             break;
           case 'navigationMode':
-            this.model.updateNavigationMode(change.currentValue);
+            this.updateNavigationMode(change.currentValue);
             break;
           /* istanbul ignore next */
           default:
@@ -169,7 +191,7 @@ export class WizardComponent implements OnChanges, AfterContentInit {
   /**
    * Initialization work
    */
-  ngAfterContentInit(): void {
+  public ngAfterContentInit(): void {
     // add a subscriber to the wizard steps QueryList to listen to changes in the DOM
     this.wizardSteps.changes.subscribe(changedWizardSteps => {
       this.model.updateWizardSteps(changedWizardSteps.toArray());
@@ -179,9 +201,20 @@ export class WizardComponent implements OnChanges, AfterContentInit {
     this.model.disableNavigationBar = this.disableNavigationBar;
     this.model.defaultStepIndex = this.defaultStepIndex;
     this.model.updateWizardSteps(this.wizardSteps.toArray());
-    this.model.updateNavigationMode(this.navigationMode);
+    this.updateNavigationMode(this.navigationMode);
 
     // finally reset the whole wizard state
     this.navigation.reset();
   }
+
+  /**
+   * Updates the navigation mode for this wizard component.
+   *
+   * Initially the wizard component uses the navigation mode specified in the [[navigationMode]] input
+   * or the default navigation mode if the [[navigationMode]] input is not defined.
+   * Use this method to select a different navigation mode after the wizard component is initialized.
+   */
+  public updateNavigationMode(navigationModeInput: NavigationModeInput) {
+    this.model.updateNavigationMode(this.navigationModeFactory.create(this, navigationModeInput));
+  }
 }

src/lib/directives/enable-back-links.directive.spec.ts

@@ -31,11 +31,11 @@ class WizardTestComponent {
 
   public completionStepExit: (direction: MovingDirection, source: number) => void = this.exitFrom;
 
-  enterInto(direction: MovingDirection, destination: number): void {
+  public enterInto(direction: MovingDirection, destination: number): void {
     this.eventLog.push(`enter ${MovingDirection[direction]} ${destination}`);
   }
 
-  exitFrom(direction: MovingDirection, source: number): void {
+  public exitFrom(direction: MovingDirection, source: number): void {
     this.eventLog.push(`exit ${MovingDirection[direction]} ${source}`);
   }
 }

src/lib/directives/enable-back-links.directive.ts

@@ -45,7 +45,7 @@ export class EnableBackLinksDirective implements OnInit {
   /**
    * Initialization work
    */
-  ngOnInit(): void {
+  public ngOnInit(): void {
     this.completionStep.canExit = true;
     this.completionStep.stepExit = this.stepExit;
   }

src/lib/directives/go-to-step.directive.spec.ts

@@ -47,7 +47,7 @@ class WizardTestComponent {
 
   public eventLog: Array<string> = [];
 
-  finalizeStep(stepIndex: number): void {
+  public finalizeStep(stepIndex: number): void {
     this.eventLog.push(`finalize ${stepIndex}`);
   }
 }

src/lib/directives/next-step.directive.spec.ts

@@ -31,7 +31,7 @@ import {NextStepDirective} from './next-step.directive';
 class WizardTestComponent {
   public eventLog: Array<string> = [];
 
-  finalizeStep(stepIndex: number): void {
+  public finalizeStep(stepIndex: number): void {
     this.eventLog.push(`finalize ${stepIndex}`);
   }
 }

src/lib/directives/optional-step.directive.ts

@@ -38,7 +38,7 @@ export class OptionalStepDirective implements OnInit {
   /**
    * Initialization work
    */
-  ngOnInit(): void {
+  public ngOnInit(): void {
     this.wizardStep.optional = true;
   }
 }

src/lib/directives/previous-step.directive.spec.ts

@@ -31,7 +31,7 @@ import {PreviousStepDirective} from './previous-step.directive';
 class WizardTestComponent {
   public eventLog: Array<string> = [];
 
-  finalizeStep(stepIndex: number): void {
+  public finalizeStep(stepIndex: number): void {
     this.eventLog.push(`finalize ${stepIndex}`);
   }
 }

src/lib/directives/selected-step.directive.ts

@@ -29,7 +29,7 @@ export class SelectedStepDirective implements OnInit {
   /**
    * Initialization work
    */
-  ngOnInit(): void {
+  public ngOnInit(): void {
     this.wizardStep.defaultSelected = true;
   }
 }

src/lib/directives/wizard-completion-step.directive.spec.ts

@@ -29,11 +29,11 @@ class WizardTestComponent {
 
   public eventLog: Array<string> = [];
 
-  enterInto(direction: MovingDirection, destination: number): void {
+  public enterInto(direction: MovingDirection, destination: number): void {
     this.eventLog.push(`enter ${MovingDirection[direction]} ${destination}`);
   }
 
-  exitFrom(direction: MovingDirection, source: number): void {
+  public exitFrom(direction: MovingDirection, source: number): void {
     this.eventLog.push(`exit ${MovingDirection[direction]} ${source}`);
   }
 }

src/lib/directives/wizard-step.directive.spec.ts

@@ -29,11 +29,11 @@ class WizardTestComponent {
 
   public eventLog: Array<string> = [];
 
-  enterInto(direction: MovingDirection, destination: number): void {
+  public enterInto(direction: MovingDirection, destination: number): void {
     this.eventLog.push(`enter ${MovingDirection[direction]} ${destination}`);
   }
 
-  exitFrom(direction: MovingDirection, source: number): void {
+  public exitFrom(direction: MovingDirection, source: number): void {
     this.eventLog.push(`exit ${MovingDirection[direction]} ${source}`);
   }
 }

src/lib/navigation/base-navigation-mode-factory.provider.ts

@@ -0,0 +1,72 @@
+import {FreeNavigationMode} from './free-navigation-mode';
+import {NavigationMode} from './navigation-mode.interface';
+import {SemiStrictNavigationMode} from './semi-strict-navigation-mode';
+import {StrictNavigationMode} from './strict-navigation-mode';
+import {WizardComponent} from '../components/wizard.component';
+import {NavigationModeInput} from './navigation-mode-input.interface';
+import {NavigationModeFactory} from './navigation-mode-factory.interface';
+
+/**
+ * A factory used to create [[NavigationMode]] instances
+ */
+export class BaseNavigationModeFactory implements NavigationModeFactory {
+
+  /**
+   * @inheritDoc
+   */
+  public create(wizard: WizardComponent, navigationModeInput: NavigationModeInput): NavigationMode {
+    let navigationModeName: string;
+    if (typeof navigationModeInput === 'function') {
+      // input is a function
+      return navigationModeInput(wizard);
+    } else {
+      // input is a name
+      navigationModeName = navigationModeInput;
+    }
+    // create NavigationMode by name
+    return this.createByName(wizard, navigationModeName);
+  }
+
+  /**
+   * Create a [[NavigationMode]] for the given wizard instance by a navigation mode name
+   *
+   * @param wizard The wizard componenent where the created [[NavigationMode]] will be used
+   * @param navigationModeInput The name of a built-in navigation mode or a custom navigation mode
+   * @returns The created [[NavigationMode]]
+   */
+  protected createByName(wizard: WizardComponent, navigationModeInput: string): NavigationMode {
+    switch (navigationModeInput) {
+      case 'free':
+        return new FreeNavigationMode(wizard.model);
+      case 'semi-strict':
+        return new SemiStrictNavigationMode(wizard.model);
+      case 'strict':
+        return new StrictNavigationMode(wizard.model);
+      default:
+        return !navigationModeInput ? this.createDefault(wizard) : this.createUnknown(wizard, navigationModeInput);
+    }
+  }
+
+  /**
+   * Create a [[NavigationMode]] for the given wizard instance which does not have a configured navigation mode
+   *
+   * @param wizard The wizard componenent where the created [[NavigationMode]] will be used
+   * @returns The created [[NavigationMode]]
+   */
+  protected createDefault(wizard: WizardComponent): NavigationMode {
+    return new StrictNavigationMode(wizard.model);
+  }
+
+  /**
+   * Create a [[NavigationMode]] for the given wizard instance by a not recognized navigation mode name
+   *
+   * The base implementation always throws an Error.
+   *
+   * @param wizard The wizard componenent where the created [[NavigationMode]] will be used
+   * @param navigationModeInput The name of a custom navigation mode
+   * @returns The created [[NavigationMode]]
+   */
+  protected createUnknown(wizard: WizardComponent, navigationModeInput: string): NavigationMode {
+    throw new Error(`Unknown navigation mode name: ${navigationModeInput}`);
+  }
+}