Added ability to generate RSS feed URLs from the UI

Moved property sorting into its own component

src/app/components/sort-property/sort-property.component.html

@@ -0,0 +1,14 @@
+<div>
+    <div style="display: inline-block;">
+        <mat-form-field appearance="outline" style="width: 165px;">
+            <mat-select [(ngModel)]="this.sortProperty" (selectionChange)="emitSortOptionChanged()">
+                <mat-option *ngFor="let sortOption of sortProperties | keyvalue" [value]="sortOption.key">
+                    {{sortOption['value']['label']}}
+                </mat-option>
+            </mat-select>
+        </mat-form-field>
+    </div>
+    <div class="sort-dir-div">
+        <button (click)="toggleModeChange()" mat-icon-button><mat-icon>{{descendingMode ? 'arrow_downward' : 'arrow_upward'}}</mat-icon></button>
+    </div>
+</div>

src/app/components/sort-property/sort-property.component.scss

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+.sort-dir-div {
+    display: inline-block;
+    position: absolute;
+    top: 4px;
+}

src/app/components/sort-property/sort-property.component.spec.ts

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+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { SortPropertyComponent } from './sort-property.component';
+
+describe('SortPropertyComponent', () => {
+  let component: SortPropertyComponent;
+  let fixture: ComponentFixture<SortPropertyComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [ SortPropertyComponent ]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(SortPropertyComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/components/sort-property/sort-property.component.ts

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+import { Component, Input, EventEmitter, Output } from '@angular/core';
+import { Sort } from 'api-types';
+
+@Component({
+  selector: 'app-sort-property',
+  templateUrl: './sort-property.component.html',
+  styleUrls: ['./sort-property.component.scss']
+})
+export class SortPropertyComponent {
+  sortProperties = {
+    'registered': {
+      'key': 'registered',
+      'label': $localize`Download Date`
+    },
+    'upload_date': {
+      'key': 'upload_date',
+      'label': $localize`Upload Date`
+    },
+    'title': {
+      'key': 'title',
+      'label': $localize`Name`
+    },
+    'size': {
+      'key': 'size',
+      'label': $localize`File Size`
+    },
+    'duration': {
+      'key': 'duration',
+      'label': $localize`Duration`
+    }
+  };
+  
+  @Input() sortProperty = 'registered';
+  @Input() descendingMode = true;
+
+  @Output() sortPropertyChange = new EventEmitter<unknown>();
+  @Output() descendingModeChange = new EventEmitter<number>();
+  @Output() sortOptionChanged = new EventEmitter<Sort>();
+
+  toggleModeChange(): void {
+    this.descendingMode = !this.descendingMode;
+    this.emitSortOptionChanged();
+  }
+
+  emitSortOptionChanged(): void {
+    if (!this.sortProperty || !this.sortProperties[this.sortProperty]) {
+      return;
+    }
+    this.sortOptionChanged.emit({
+      by: this.sortProperty,
+      order: this.descendingMode ? -1 : 1
+    });
+  }
+}