Text Fields

/**
 * Service for monitoring input autofill state
 */
class AutofillMonitor implements OnDestroy {
  /**
   * Monitor an element for autofill changes
   * @param elementOrRef - Element to monitor
   * @returns Observable that emits autofill events
   */
  monitor(elementOrRef: Element | ElementRef<Element>): Observable<AutofillEvent>;

  /**
   * Stop monitoring an element for autofill changes
   * @param elementOrRef - Element to stop monitoring
   */
  stopMonitoring(elementOrRef: Element | ElementRef<Element>): void;
}

/**
 * Directive for detecting autofill on input elements
 */
class CdkAutofill implements OnDestroy, OnInit {
  /**
   * Event emitted when the autofill state changes
   */
  readonly cdkAutofill: EventEmitter<AutofillEvent>;
}

/**
 * Event emitted when autofill state changes
 */
interface AutofillEvent {
  /**
   * The target element that was autofilled
   */
  target: Element;

  /**
   * Whether the element is currently autofilled
   */
  isAutofilled: boolean;
}

import { Component, ElementRef, ViewChild } from '@angular/core';
import { AutofillMonitor } from '@angular/cdk/text-field';

@Component({
  template: `
    <form>
      <input 
        #emailInput
        type="email" 
        placeholder="Email"
        cdkAutofill
        (cdkAutofill)="onAutofill($event)"
        [class.autofilled]="isEmailAutofilled">
      
      <input 
        #passwordInput
        type="password" 
        placeholder="Password"
        [class.autofilled]="isPasswordAutofilled">
    </form>
  `,
  styles: [`
    .autofilled {
      background-color: #e8f5e8;
      border-color: #4caf50;
    }
  `]
})
export class AutofillExample {
  @ViewChild('emailInput') emailInput!: ElementRef;
  @ViewChild('passwordInput') passwordInput!: ElementRef;

  isEmailAutofilled = false;
  isPasswordAutofilled = false;

  constructor(private autofillMonitor: AutofillMonitor) {}

  ngAfterViewInit() {
    // Monitor email input
    this.autofillMonitor.monitor(this.emailInput).subscribe(event => {
      this.isEmailAutofilled = event.isAutofilled;
    });

    // Monitor password input
    this.autofillMonitor.monitor(this.passwordInput).subscribe(event => {
      this.isPasswordAutofilled = event.isAutofilled;
    });
  }

  onAutofill(event: any) {
    console.log('Autofill detected:', event.isAutofilled);
  }

  ngOnDestroy() {
    this.autofillMonitor.stopMonitoring(this.emailInput);
    this.autofillMonitor.stopMonitoring(this.passwordInput);
  }
}

/**
 * Directive for auto-resizing textarea elements
 */
class CdkTextareaAutosize implements AfterViewInit, DoCheck, OnDestroy {
  /**
   * Minimum number of rows for the textarea
   */
  minRows: number;

  /**
   * Maximum number of rows for the textarea
   */
  maxRows: number;

  /**
   * Whether autosizing is enabled
   */
  enabled: boolean;

  /**
   * Placeholder text for calculating initial size
   */
  placeholder: string;

  /**
   * Force the textarea to resize to fit its content
   * @param force - Whether to force resize even if content hasn't changed
   */
  resizeToFitContent(force?: boolean): void;

  /**
   * Reset the textarea to its original size
   */
  reset(): void;

  /**
   * Check if the textarea needs to be resized
   */
  _noopInputHandler(): void;

  /**
   * Get the minimum height for the textarea
   */
  _getMinHeight(): number;

  /**
   * Get the maximum height for the textarea
   */
  _getMaxHeight(): number;
}

import { Component } from '@angular/core';
import { CdkTextareaAutosize } from '@angular/cdk/text-field';

@Component({
  template: `
    <!-- Basic autosize -->
    <textarea 
      cdkTextareaAutosize
      placeholder="This textarea will resize automatically...">
    </textarea>

    <!-- With min/max rows -->
    <textarea 
      cdkTextareaAutosize
      cdkAutosizeMinRows="2"
      cdkAutosizeMaxRows="5"
      placeholder="Min 2 rows, max 5 rows">
    </textarea>

    <!-- Programmatic control -->
    <textarea 
      #autosize="cdkTextareaAutosize"
      cdkTextareaAutosize
      [(ngModel)]="content"
      placeholder="Programmatically controlled">
    </textarea>
    
    <button (click)="autosize.reset()">Reset Size</button>
    <button (click)="autosize.resizeToFitContent(true)">Force Resize</button>
    <button (click)="toggleAutosize(autosize)">
      {{ autosize.enabled ? 'Disable' : 'Enable' }} Autosize
    </button>
  `
})
export class TextareaAutosizeExample {
  content = '';

  toggleAutosize(autosize: CdkTextareaAutosize) {
    autosize.enabled = !autosize.enabled;
    if (autosize.enabled) {
      autosize.resizeToFitContent(true);
    }
  }
}

import { Component, ViewChild } from '@angular/core';
import { CdkTextareaAutosize } from '@angular/cdk/text-field';
import { FormControl, FormGroup } from '@angular/forms';

@Component({
  template: `
    <form [formGroup]="commentForm">
      <div class="form-field">
        <label for="comment">Comment</label>
        <textarea
          id="comment"
          #commentTextarea="cdkTextareaAutosize"
          cdkTextareaAutosize
          cdkAutofill
          (cdkAutofill)="onAutofill($event)"
          formControlName="comment"
          [cdkAutosizeMinRows]="minRows"
          [cdkAutosizeMaxRows]="maxRows"
          [placeholder]="placeholder"
          [class.autofilled]="isAutofilled"
          class="comment-textarea">
        </textarea>
        
        <div class="textarea-actions">
          <button type="button" (click)="resetSize()">Reset Size</button>
          <button type="button" (click)="adjustRows(-1)">Fewer Rows</button>
          <button type="button" (click)="adjustRows(1)">More Rows</button>
        </div>
        
        <div class="field-info">
          <small>
            Min: {{ minRows }} rows, Max: {{ maxRows }} rows
            {{ isAutofilled ? '(Autofilled)' : '' }}
          </small>
        </div>
      </div>
    </form>
  `,
  styles: [`
    .form-field {
      margin-bottom: 16px;
    }
    
    .comment-textarea {
      width: 100%;
      padding: 8px;
      border: 1px solid #ccc;
      border-radius: 4px;
      font-family: inherit;
      transition: border-color 0.3s;
    }
    
    .comment-textarea:focus {
      border-color: #2196f3;
      outline: none;
    }
    
    .comment-textarea.autofilled {
      background-color: #fff3cd;
      border-color: #ffc107;
    }
    
    .textarea-actions {
      margin-top: 8px;
      display: flex;
      gap: 8px;
    }
    
    .textarea-actions button {
      padding: 4px 8px;
      border: 1px solid #ccc;
      background: white;
      cursor: pointer;
    }
    
    .field-info {
      margin-top: 4px;
      color: #666;
    }
  `]
})
export class AdvancedTextFieldExample {
  @ViewChild('commentTextarea') commentTextarea!: CdkTextareaAutosize;

  commentForm = new FormGroup({
    comment: new FormControl('')
  });

  minRows = 3;
  maxRows = 8;
  placeholder = 'Enter your comment here...';
  isAutofilled = false;

  onAutofill(event: any) {
    this.isAutofilled = event.isAutofilled;
  }

  resetSize() {
    this.commentTextarea.reset();
  }

  adjustRows(delta: number) {
    if (delta > 0) {
      this.maxRows = Math.min(this.maxRows + 1, 15);
    } else {
      this.minRows = Math.max(this.minRows - 1, 1);
    }
    
    // Force resize after changing constraints
    setTimeout(() => {
      this.commentTextarea.resizeToFitContent(true);
    });
  }
}

/**
 * Angular module that includes all CDK text field directives and services
 */
class TextFieldModule {}