fix: incorrect focus on editing filter chips (hypertrace#1227)

Author: aaron-steinfeld

projects/components/src/combo-box/combo-box.component.ts

@@ -255,7 +255,7 @@ export class ComboBoxComponent<TValue = string> implements AfterViewInit, OnChan
   public onOptionClick(option: ComboBoxOption<TValue>): void {
     this.setText(option.text);
     this.hidePopover();
-    this.input.nativeElement.focus();
+    this.focus();
     this.selection.emit(this.buildResult());
   }
 
@@ -325,7 +325,7 @@ export class ComboBoxComponent<TValue = string> implements AfterViewInit, OnChan
      * This might just be a mac or browser specific thing, but when an input box gets tabbed into it doesn't
      * get focus, but the entire text content is selected. Let's use that to give ourselves focus as well.
      */
-    this.input.nativeElement.focus();
+    this.focus();
   }
 
   public onEscape(): void {
@@ -369,6 +369,10 @@ export class ComboBoxComponent<TValue = string> implements AfterViewInit, OnChan
     return this.createOption !== undefined && !isNil(this.text);
   }
 
+  public focus(): void {
+    this.input.nativeElement.focus();
+  }
+
   private buildResult(): ComboBoxResult<TValue> {
     return { text: this.text, option: this.findOption(this.text) };
   }

projects/components/src/filtering/filter-bar/filter-bar.component.ts

@@ -2,7 +2,6 @@ import {
   ChangeDetectionStrategy,
   ChangeDetectorRef,
   Component,
-  ElementRef,
   EventEmitter,
   Input,
   OnChanges,
@@ -13,13 +12,15 @@ import {
 } from '@angular/core';
 import { IconType } from '@hypertrace/assets-library';
 import { TypedSimpleChanges } from '@hypertrace/common';
+import { isEqual } from 'lodash-es';
 import { BehaviorSubject, Observable, Subscription } from 'rxjs';
-import { mergeMap } from 'rxjs/operators';
+import { distinctUntilChanged, switchMap } from 'rxjs/operators';
 import { IconSize } from '../../icon/icon-size';
 import { Filter } from '../filter/filter';
 import { FilterAttribute } from '../filter/filter-attribute';
 import { FilterUrlService } from '../filter/filter-url.service';
 import { FilterBarService } from './filter-bar.service';
+import { FilterChipComponent } from './filter-chip/filter-chip.component';
 
 @Component({
   selector: 'ht-filter-bar',
@@ -83,14 +84,16 @@ export class FilterBarComponent implements OnChanges, OnInit, OnDestroy {
   @Output()
   public readonly filtersChange: EventEmitter<Filter[]> = new EventEmitter();
 
-  @ViewChild('filterInput', { read: ElementRef })
-  public readonly filterInput!: ElementRef;
+  @ViewChild('filterInput')
+  public readonly filterInput?: FilterChipComponent;
 
   public isFocused: boolean = false;
 
   private readonly attributeSubject$: BehaviorSubject<FilterAttribute[]> = new BehaviorSubject<FilterAttribute[]>([]);
   private readonly internalFiltersSubject$: BehaviorSubject<Filter[]> = new BehaviorSubject<Filter[]>([]);
-  public readonly internalFilters$: Observable<Filter[]> = this.internalFiltersSubject$.asObservable();
+  public readonly internalFilters$: Observable<Filter[]> = this.internalFiltersSubject$
+    .asObservable()
+    .pipe(distinctUntilChanged(isEqual));
 
   private subscription?: Subscription;
 
@@ -123,7 +126,7 @@ export class FilterBarComponent implements OnChanges, OnInit, OnDestroy {
 
   private subscribeToUrlFilterChanges(): void {
     this.subscription = this.attributeSubject$
-      .pipe(mergeMap(attributes => this.filterUrlService.getUrlFiltersChanges$(attributes)))
+      .pipe(switchMap(attributes => this.filterUrlService.getUrlFiltersChanges$(attributes)))
       .subscribe(filters => this.onFiltersChanged(filters, true, false));
   }
 
@@ -168,7 +171,7 @@ export class FilterBarComponent implements OnChanges, OnInit, OnDestroy {
   }
 
   private resetFocus(): void {
-    this.filterInput?.nativeElement.focus();
+    this.filterInput?.focus();
   }
 
   private updateFilter(oldFilter: Filter, newFilter: Filter): void {

projects/components/src/filtering/filter-bar/filter-chip/filter-chip.component.ts

@@ -1,6 +1,16 @@
-import { ChangeDetectionStrategy, Component, EventEmitter, Input, OnChanges, OnInit, Output } from '@angular/core';
+import {
+  ChangeDetectionStrategy,
+  Component,
+  EventEmitter,
+  Input,
+  OnChanges,
+  OnInit,
+  Output,
+  ViewChild
+} from '@angular/core';
 import { TypedSimpleChanges } from '@hypertrace/common';
 import { ComboBoxMode, ComboBoxOption, ComboBoxResult } from '../../../combo-box/combo-box-api';
+import { ComboBoxComponent } from '../../../combo-box/combo-box.component';
 import { Filter, IncompleteFilter } from '../../filter/filter';
 import { FilterAttribute } from '../../filter/filter-attribute';
 import { FilterChipService } from './filter-chip.service';
@@ -43,6 +53,9 @@ export class FilterChipComponent implements OnInit, OnChanges {
   @Output()
   public readonly clear: EventEmitter<void> = new EventEmitter();
 
+  @ViewChild(ComboBoxComponent)
+  public readonly comboBox?: ComboBoxComponent;
+
   public text?: string;
   public options?: ComboBoxOption<IncompleteFilter>[];
 
@@ -86,6 +99,10 @@ export class FilterChipComponent implements OnInit, OnChanges {
     this.clear.emit();
   }
 
+  public focus(): void {
+    this.comboBox?.focus();
+  }
+
   private isValidFilter(result: ComboBoxResult<IncompleteFilter>): result is ComboBoxResult<Filter> {
     return result.option?.value !== undefined && result.option?.value.value !== undefined;
   }