From f4e027b9b30a9875581b262cee4547e80ba2e791 Mon Sep 17 00:00:00 2001
From: Derek Burgman <derek@dereekb.com>
Date: Thu, 24 Nov 2022 23:45:07 -0600
Subject: [PATCH] feat: added duplicate button to repeatArrayField

---
 .../modules/form/container/value.component.ts |  8 ++-
 .../value/array/array.field.component.ts      | 54 ++++++++++++++++++-
 .../formly/field/value/array/array.field.ts   |  7 ++-
 packages/dbx-web/src/lib/layout/text/index.ts |  1 +
 4 files changed, 64 insertions(+), 6 deletions(-)

diff --git a/apps/demo/src/app/modules/doc/modules/form/container/value.component.ts b/apps/demo/src/app/modules/doc/modules/form/container/value.component.ts
index a55c72a51..04df2c653 100644
--- a/apps/demo/src/app/modules/doc/modules/form/container/value.component.ts
+++ b/apps/demo/src/app/modules/doc/modules/form/container/value.component.ts
@@ -96,7 +96,9 @@ export class DocFormValueComponent {
     }),
     repeatArrayField({
       key: 'test2',
-      label: 'Field With Add and Remove Diabled',
+      label: 'Field With Add and Remove Diabled Via Field',
+      description: 'Shows the remove button being disabled when a value is a certain value, and shows the duplicate button.',
+      duplicateText: 'Make Copy',
       repeatFieldGroup: [
         nameField(),
         toggleField({
@@ -106,8 +108,10 @@ export class DocFormValueComponent {
       ],
       disableRearrange: true,
       allowAdd: true,
+      allowDuplicate: true,
       allowRemove: ({ i, value }) => !(value as { disable: boolean }).disable,
-      labelForField: ({ value }) => (value as { name: string }).name
+      labelForField: ({ value }) => (value as { name: string }).name,
+      addDuplicateToEnd: true
     })
   ];
 
diff --git a/packages/dbx-form/src/lib/formly/field/value/array/array.field.component.ts b/packages/dbx-form/src/lib/formly/field/value/array/array.field.component.ts
index d26be92e9..91ba1fad2 100644
--- a/packages/dbx-form/src/lib/formly/field/value/array/array.field.component.ts
+++ b/packages/dbx-form/src/lib/formly/field/value/array/array.field.component.ts
@@ -1,5 +1,5 @@
 import { CdkDragDrop } from '@angular/cdk/drag-drop';
-import { Component, OnInit } from '@angular/core';
+import { Component, OnInit, TrackByFunction } from '@angular/core';
 import { asDecisionFunction, asGetter, cachedGetter, DecisionFunction, FactoryWithInput, FactoryWithRequiredInput, Getter, getValueFromGetter, IndexRef, makeGetter, Maybe } from '@dereekb/util';
 import { FieldArrayTypeConfig, FieldArrayType, FormlyFieldConfig, FormlyFieldProps } from '@ngx-formly/core';
 
@@ -17,6 +17,10 @@ export interface DbxFormRepeatArrayConfig<T = unknown> extends Pick<FormlyFieldP
    * Text for the add button.
    */
   addText?: string;
+  /**
+   * Text for the duplicate button.
+   */
+  duplicateText?: string;
   /**
    * Text for the remove button.
    */
@@ -33,10 +37,18 @@ export interface DbxFormRepeatArrayConfig<T = unknown> extends Pick<FormlyFieldP
    * True by default.
    */
   allowAdd?: boolean;
+  /**
+   * Whether or not to allow duplicateing items. Can optionally pass a decision function that decides whether or not a specific item can be removed.
+   */
+  allowDuplicate?: boolean | DecisionFunction<DbxFormRepeatArrayPair<T>>;
   /**
    * Whether or not to allow removing items. Can optionally pass a decision function that decides whether or not a specific item can be removed.
    */
   allowRemove?: boolean | DecisionFunction<DbxFormRepeatArrayPair<T>>;
+  /**
+   * Adds the duplicate to the end of the values
+   */
+  addDuplicateToEnd?: boolean;
 }
 
 @Component({
@@ -45,7 +57,7 @@ export interface DbxFormRepeatArrayConfig<T = unknown> extends Pick<FormlyFieldP
       <dbx-subsection [header]="label" [hint]="description">
         <!-- Fields -->
         <div class="dbx-form-repeat-array-fields" cdkDropList [cdkDropListDisabled]="disableRearrange" (cdkDropListDropped)="drop($event)">
-          <div class="dbx-form-repeat-array-field" cdkDrag cdkDragLockAxis="y" *ngFor="let field of field.fieldGroup; let i = index; let last = last">
+          <div class="dbx-form-repeat-array-field" cdkDrag cdkDragLockAxis="y" *ngFor="let field of field.fieldGroup; trackBy: trackByFunction; let i = index; let last = last">
             <div class="dbx-form-repeat-array-drag-placeholder" *cdkDragPlaceholder></div>
             <dbx-bar class="dbx-bar-fixed-height">
               <button *ngIf="!disableRearrange" cdkDragHandle mat-flat-button><mat-icon>drag_handle</mat-icon></button>
@@ -55,6 +67,7 @@ export interface DbxFormRepeatArrayConfig<T = unknown> extends Pick<FormlyFieldP
                 <span>{{ labelForItem(field, i) }}</span>
               </h4>
               <span class="dbx-spacer"></span>
+              <dbx-button *ngIf="allowDuplicate(i)" [text]="duplicateText" (buttonClick)="duplicate(i)"></dbx-button>
               <dbx-button *ngIf="allowRemove(i)" color="warn" [text]="removeText" (buttonClick)="remove(i)"></dbx-button>
             </dbx-bar>
             <formly-field class="dbx-form-repeat-array-field-content" [field]="field"></formly-field>
@@ -83,6 +96,10 @@ export class DbxFormRepeatArrayTypeComponent<T = unknown> extends FieldArrayType
     return asDecisionFunction(this.field.props.allowRemove, true);
   });
 
+  private _allowDuplicate: Getter<DecisionFunction<DbxFormRepeatArrayPair<T>>> = cachedGetter(() => {
+    return asDecisionFunction(this.field.props.allowDuplicate || false, false);
+  });
+
   get repeatArrayField(): DbxFormRepeatArrayConfig {
     return this.field.props;
   }
@@ -95,6 +112,10 @@ export class DbxFormRepeatArrayTypeComponent<T = unknown> extends FieldArrayType
     return this.field.props.description;
   }
 
+  get duplicateText(): string {
+    return this.repeatArrayField.addText ?? 'Duplicate';
+  }
+
   get addText(): string {
     return this.repeatArrayField.addText ?? 'Add';
   }
@@ -119,6 +140,10 @@ export class DbxFormRepeatArrayTypeComponent<T = unknown> extends FieldArrayType
     return this.field.props.allowAdd ?? true;
   }
 
+  get addDuplicateToEnd(): boolean {
+    return this.field.props.addDuplicateToEnd ?? false;
+  }
+
   allowRemove(i: number) {
     const array: unknown[] = this.model;
     const value = array[i] as T;
@@ -128,6 +153,15 @@ export class DbxFormRepeatArrayTypeComponent<T = unknown> extends FieldArrayType
     });
   }
 
+  allowDuplicate(i: number) {
+    const array: unknown[] = this.model;
+    const value = array[i] as T;
+    return this._allowDuplicate()({
+      i,
+      value
+    });
+  }
+
   get addItemDisabled() {
     return !this.canAddItem;
   }
@@ -142,6 +176,10 @@ export class DbxFormRepeatArrayTypeComponent<T = unknown> extends FieldArrayType
     }
   }
 
+  readonly trackByFunction: TrackByFunction<FormlyFieldConfig> = (i, x) => {
+    return x.key;
+  };
+
   /**
    * Moves the target index up one value.
    *
@@ -159,6 +197,18 @@ export class DbxFormRepeatArrayTypeComponent<T = unknown> extends FieldArrayType
     this.swapIndexes(index, index + 1);
   }
 
+  duplicate(index: number) {
+    const array: unknown[] = this.model;
+    const targetValue = array[index];
+
+    if (!targetValue) {
+      return;
+    }
+
+    const targetIndex = this.addDuplicateToEnd ? array.length : index;
+    this.add(targetIndex, targetValue, { markAsDirty: true });
+  }
+
   swapIndexes(currentIndex: number, targetIndex: number) {
     const array: unknown[] = this.model;
     const targetValue = array[currentIndex];
diff --git a/packages/dbx-form/src/lib/formly/field/value/array/array.field.ts b/packages/dbx-form/src/lib/formly/field/value/array/array.field.ts
index 383f6bad3..def3f5ea6 100644
--- a/packages/dbx-form/src/lib/formly/field/value/array/array.field.ts
+++ b/packages/dbx-form/src/lib/formly/field/value/array/array.field.ts
@@ -8,7 +8,7 @@ export interface RepeatArrayFieldConfig<T = unknown> extends DbxFormRepeatArrayC
 }
 
 export function repeatArrayField<T = unknown>(config: RepeatArrayFieldConfig<T>) {
-  const { key, label, description, repeatFieldGroup, maxLength, addText, removeText, labelForField, disableRearrange, allowAdd, allowRemove } = config;
+  const { key, label, description, repeatFieldGroup, maxLength, addText, removeText, duplicateText, labelForField, disableRearrange, allowAdd, allowRemove, allowDuplicate, addDuplicateToEnd } = config;
 
   return formlyField({
     key,
@@ -20,9 +20,12 @@ export function repeatArrayField<T = unknown>(config: RepeatArrayFieldConfig<T>)
       labelForField,
       addText,
       removeText,
+      duplicateText,
       disableRearrange,
       allowAdd,
-      allowRemove
+      allowRemove,
+      allowDuplicate,
+      addDuplicateToEnd
     }),
     fieldArray: {
       fieldGroup: asArray(repeatFieldGroup)
diff --git a/packages/dbx-web/src/lib/layout/text/index.ts b/packages/dbx-web/src/lib/layout/text/index.ts
index 5eed8d053..92399eebd 100644
--- a/packages/dbx-web/src/lib/layout/text/index.ts
+++ b/packages/dbx-web/src/lib/layout/text/index.ts
@@ -1,3 +1,4 @@
+export * from './form.description.component';
 export * from './hint.component';
 export * from './icon.spacer.component';
 export * from './label.component';