angular-archwizard
Version:
An Angular 9+ module containing a wizard component and its supporting components and directives
117 lines • 15.9 kB
JavaScript
import { BaseNavigationMode } from './base-navigation-mode.interface';
import { WizardCompletionStep } from '../util/wizard-completion-step.interface';
/**
* The default navigation mode used by [[WizardComponent]] and [[NavigationModeDirective]].
*
* It is parameterized with two navigation policies passed to constructor:
*
* - [[navigateBackward]] policy controls whether wizard steps before the current step are navigable:
*
* - `"deny"` -- the steps are not navigable
* - `"allow"` -- the steps are navigable
* - If the corresponding constructor argument is omitted or is `null` or `undefined`,
* then the default value is applied which is `"deny"`
*
* - [[navigateForward]] policy controls whether wizard steps after the current step are navigable:
*
* - `"deny"` -- the steps are not navigable
* - `"allow"` -- the steps are navigable
* - `"visited"` -- a step is navigable iff it was already visited before
* - If the corresponding constructor argument is omitted or is `null` or `undefined`,
* then the default value is applied which is `"allow"`
*/
export class ConfigurableNavigationMode extends BaseNavigationMode {
/**
* Constructor
*
* @param navigateBackward Controls whether wizard steps before the current step are navigable
* @param navigateForward Controls whether wizard steps before the current step are navigable
*/
constructor(navigateBackward = null, navigateForward = null) {
super();
this.navigateBackward = navigateBackward;
this.navigateForward = navigateForward;
this.navigateBackward = this.navigateBackward || 'allow';
this.navigateForward = this.navigateForward || 'deny';
}
/**
* @inheritDoc
*/
canTransitionToStep(wizard, destinationIndex) {
// if the destination step can be navigated to using the navigation bar,
// it should be accessible with [goToStep] as well
if (this.isNavigable(wizard, destinationIndex)) {
return true;
}
// navigation with [goToStep] is permitted if all previous steps
// to the destination step have been completed or are optional
return wizard.wizardSteps
.filter((step, index) => index < destinationIndex && index !== wizard.currentStepIndex)
.every(step => step.completed || step.optional);
}
/**
* @inheritDoc
*/
transition(wizard, destinationIndex) {
if (this.navigateForward === 'deny') {
// set all steps after the destination step to incomplete
wizard.wizardSteps
.filter((step, index) => wizard.currentStepIndex > destinationIndex && index > destinationIndex)
.forEach(step => step.completed = false);
}
super.transition(wizard, destinationIndex);
}
/**
* @inheritDoc
*/
isNavigable(wizard, destinationIndex) {
// Check if the destination step can be navigated to
const destinationStep = wizard.getStepAtIndex(destinationIndex);
if (destinationStep instanceof WizardCompletionStep) {
// A completion step can only be entered, if all previous steps have been completed, are optional, or selected
const previousStepsCompleted = wizard.wizardSteps
.filter((step, index) => index < destinationIndex)
.every(step => step.completed || step.optional || step.selected);
if (!previousStepsCompleted) {
return false;
}
}
// Apply navigation pocicies
if (destinationIndex < wizard.currentStepIndex) {
// If the destination step is before current, apply the `navigateBackward` policy
switch (this.navigateBackward) {
case 'allow': return true;
case 'deny': return false;
default:
throw new Error(`Invalid value for navigateBackward: ${this.navigateBackward}`);
}
}
else if (destinationIndex > wizard.currentStepIndex) {
// If the destination step is after current, apply the `navigateForward` policy
switch (this.navigateForward) {
case 'allow': return true;
case 'deny': return false;
case 'visited': return destinationStep.completed;
default:
throw new Error(`Invalid value for navigateForward: ${this.navigateForward}`);
}
}
else {
// Re-entering the current step is not allowed
return false;
}
}
/**
* @inheritDoc
*/
ensureCanReset(wizard) {
super.ensureCanReset(wizard);
// the default step is a completion step and the wizard contains more than one step
const defaultWizardStep = wizard.getStepAtIndex(wizard.defaultStepIndex);
const defaultCompletionStep = defaultWizardStep instanceof WizardCompletionStep;
if (defaultCompletionStep && wizard.wizardSteps.length !== 1) {
throw new Error(`The default step index ${wizard.defaultStepIndex} references a completion step`);
}
}
}
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[[navigateBackward]] policy controls whether wizard steps before the current step are navigable:\n *\n *   - `\"deny\"` -- the steps are not navigable\n *   - `\"allow\"` -- the steps are navigable\n *   - If the corresponding constructor argument is omitted or is `null` or `undefined`,\n *     then the default value is applied which is `\"deny\"`\n *\n * - [[navigateForward]] policy controls whether wizard steps after the current step are navigable:\n *\n *   - `\"deny\"` -- the steps are not navigable\n *   - `\"allow\"` -- the steps are navigable\n *   - `\"visited\"` -- a step is navigable iff it was already visited before\n *   - If the corresponding constructor argument is omitted or is `null` or `undefined`,\n *     then the default value is applied which is `\"allow\"`\n */\nexport class ConfigurableNavigationMode extends BaseNavigationMode {\n\n  /**\n   * Constructor\n   *\n   * @param navigateBackward Controls whether wizard steps before the current step are navigable\n   * @param navigateForward Controls whether wizard steps before the current step are navigable\n   */\n  constructor(\n    private navigateBackward: 'allow'|'deny'|null = null,\n    private navigateForward: 'allow'|'deny'|'visited'|null = null,\n  ) {\n    super();\n    this.navigateBackward = this.navigateBackward || 'allow';\n    this.navigateForward = this.navigateForward || 'deny';\n  }\n\n  /**\n   * @inheritDoc\n   */\n  protected canTransitionToStep(wizard: WizardComponent, destinationIndex: number): boolean {\n    // if the destination step can be navigated to using the navigation bar,\n    // it should be accessible with [goToStep] as well\n    if (this.isNavigable(wizard, destinationIndex)) {\n      return true;\n    }\n\n    // navigation with [goToStep] is permitted if all previous steps\n    // to the destination step have been completed or are optional\n    return wizard.wizardSteps\n        .filter((step, index) => index < destinationIndex && index !== wizard.currentStepIndex)\n        .every(step => step.completed || step.optional);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  protected transition(wizard: WizardComponent, destinationIndex: number): void {\n    if (this.navigateForward === 'deny') {\n      // set all steps after the destination step to incomplete\n      wizard.wizardSteps\n        .filter((step, index) => wizard.currentStepIndex > destinationIndex && index > destinationIndex)\n        .forEach(step => step.completed = false);\n    }\n\n    super.transition(wizard, destinationIndex);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  public isNavigable(wizard: WizardComponent, destinationIndex: number): boolean {\n    // Check if the destination step can be navigated to\n    const destinationStep = wizard.getStepAtIndex(destinationIndex);\n    if (destinationStep instanceof WizardCompletionStep) {\n      // A completion step can only be entered, if all previous steps have been completed, are optional, or selected\n      const previousStepsCompleted = wizard.wizardSteps\n        .filter((step, index) => index < destinationIndex)\n        .every(step => step.completed || step.optional || step.selected);\n      if (!previousStepsCompleted) {\n        return false;\n      }\n    }\n\n    // Apply navigation pocicies\n    if (destinationIndex < wizard.currentStepIndex) {\n      // If the destination step is before current, apply the `navigateBackward` policy\n      switch (this.navigateBackward) {\n        case 'allow': return true;\n        case 'deny': return false;\n        default:\n          throw new Error(`Invalid value for navigateBackward: ${this.navigateBackward}`);\n      }\n    } else if (destinationIndex > wizard.currentStepIndex) {\n      // If the destination step is after current, apply the `navigateForward` policy\n      switch (this.navigateForward) {\n        case 'allow': return true;\n        case 'deny': return false;\n        case 'visited': return destinationStep.completed;\n        default:\n          throw new Error(`Invalid value for navigateForward: ${this.navigateForward}`);\n      }\n    } else {\n      // Re-entering the current step is not allowed\n      return false;\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  protected ensureCanReset(wizard: WizardComponent): void {\n    super.ensureCanReset(wizard);\n\n    // the default step is a completion step and the wizard contains more than one step\n    const defaultWizardStep = wizard.getStepAtIndex(wizard.defaultStepIndex);\n    const defaultCompletionStep = defaultWizardStep instanceof WizardCompletionStep;\n    if (defaultCompletionStep && wizard.wizardSteps.length !== 1) {\n      throw new Error(`The default step index ${wizard.defaultStepIndex} references a completion step`);\n    }\n  }\n}\n"]}