Reversible block arrows & key navigation

frontend/src/app/components/block/block.component.html

@@ -1,36 +1,24 @@
 <div class="container-xl" (window:resize)="onResize($event)">
 
-  <div class="title-block" id="block">
+  <div class="title-block" [class.time-ltr]="timeLtr" id="block">
     <h1>
-      <ng-template [ngIf]="blockHeight === 0"><ng-container i18n="@@2303359202781425764">Genesis</ng-container>
+      <ng-container *ngIf="blockHeight > 0; else genesis" i18n="shared.block-title">Block</ng-container>
+      <ng-template #genesis i18n="@@2303359202781425764">Genesis</ng-template>
       <span class="next-previous-blocks">
-          <a *ngIf="showNextBlocklink" [routerLink]="['/block/' | relativeUrl, nextBlockHeight]" (click)="navigateToNextBlock()" i18n-ngbTooltip="Next Block" ngbTooltip="Next Block" placement="bottom">
+        <a *ngIf="showNextBlocklink" class="nav-arrow next" [routerLink]="['/block/' | relativeUrl, nextBlockHeight]" (click)="navigateToNextBlock()" i18n-ngbTooltip="Next Block" ngbTooltip="Next Block" placement="bottom">
           <fa-icon [icon]="['fas', 'angle-left']" [fixedWidth]="true"></fa-icon>
         </a>
-          <a [routerLink]="['/block/' | relativeUrl, blockHash]">{{ blockHeight }}</a>
+        <span *ngIf="!showNextBlocklink" placement="bottom" class="disable nav-arrow next">
-          <span placement="bottom" class="disable">
+          <fa-icon [icon]="['fas', 'angle-left']" [fixedWidth]="true"></fa-icon>
+        </span>
+        <a [routerLink]="['/block/' | relativeUrl, blockHash]" class="block-link">{{ blockHeight }}</a>
+        <a *ngIf="showPreviousBlocklink && block" class="nav-arrow prev"  [routerLink]="['/block/' | relativeUrl, block.previousblockhash]" (click)="navigateToPreviousBlock()" i18n-ngbTooltip="Previous Block" ngbTooltip="Previous Block" placement="bottom">
+          <fa-icon [icon]="['fas', 'angle-right']" [fixedWidth]="true"></fa-icon>
+        </a>
+        <span *ngIf="!showPreviousBlocklink || !block" placement="bottom" class="disable nav-arrow prev">
           <fa-icon [icon]="['fas', 'angle-right']" [fixedWidth]="true"></fa-icon>
         </span>
       </span>
-      </ng-template>
-      <ng-template [ngIf]="blockHeight" i18n="shared.block-title">Block <ng-container *ngTemplateOutlet="blockTemplateContent"></ng-container></ng-template>
-      <ng-template #blockTemplateContent>
-        <span class="next-previous-blocks">
-          <a *ngIf="showNextBlocklink" [routerLink]="['/block/' | relativeUrl, nextBlockHeight]" (click)="navigateToNextBlock()" i18n-ngbTooltip="Next Block" ngbTooltip="Next Block" placement="bottom">
-            <fa-icon [icon]="['fas', 'angle-left']" [fixedWidth]="true"></fa-icon>
-          </a>
-          <span *ngIf="!showNextBlocklink" placement="bottom" class="disable">
-            <fa-icon [icon]="['fas', 'angle-left']" [fixedWidth]="true"></fa-icon>
-          </span>
-          <a [routerLink]="['/block/' | relativeUrl, blockHash]">{{ blockHeight }}</a>
-          <a *ngIf="showPreviousBlocklink && block" [routerLink]="['/block/' | relativeUrl, block.previousblockhash]" (click)="navigateToPreviousBlock()" i18n-ngbTooltip="Previous Block" ngbTooltip="Previous Block" placement="bottom">
-            <fa-icon [icon]="['fas', 'angle-right']" [fixedWidth]="true"></fa-icon>
-          </a>
-          <span *ngIf="!showPreviousBlocklink" placement="bottom" class="disable">
-            <fa-icon [icon]="['fas', 'angle-right']" [fixedWidth]="true"></fa-icon>
-          </span>
-        </span>
-      </ng-template>
     </h1>
 
     <div class="grow"></div>

frontend/src/app/components/block/block.component.scss

@@ -111,7 +111,8 @@ h1 {
 
 .next-previous-blocks {
   font-size: 28px;
-  display: inline-block;
+  display: inline-flex;
+  flex-direction: row;
   @media (min-width: 768px) {
     font-size: 36px;
   }
@@ -125,6 +126,21 @@ h1 {
   }
 }
 
+.time-ltr .next-previous-blocks {
+  .nav-arrow {
+    transform: rotate(180deg);
+  }
+  .nav-arrow.next {
+    order: 2;
+  }
+  .block-link {
+    order: 1;
+  }
+  .nav-arrow.prev {
+    order: 0;
+  }
+}
+
 .disable {
   font-size: 28px;
   color: #393e5c73;

frontend/src/app/components/block/block.component.ts

@@ -57,6 +57,8 @@ export class BlockComponent implements OnInit, OnDestroy {
   nextBlockSubscription: Subscription = undefined;
   nextBlockSummarySubscription: Subscription = undefined;
   nextBlockTxListSubscription: Subscription = undefined;
+  timeLtrSubscription: Subscription;
+  timeLtr: boolean;
 
   @ViewChild('blockGraph') blockGraph: BlockOverviewGraphComponent;
 
@@ -80,6 +82,10 @@ export class BlockComponent implements OnInit, OnDestroy {
     this.network = this.stateService.network;
     this.itemsPerPage = this.stateService.env.ITEMS_PER_PAGE;
 
+    this.timeLtrSubscription = this.stateService.timeLtr.subscribe((ltr) => {
+      this.timeLtr = !!ltr;
+    });
+
     this.txsLoadingStatus$ = this.route.paramMap
       .pipe(
         switchMap(() => this.stateService.loadingIndicators$),
@@ -277,10 +283,12 @@ export class BlockComponent implements OnInit, OnDestroy {
     });
 
     this.keyNavigationSubscription = this.stateService.keyNavigation$.subscribe((event) => {
-      if (this.showPreviousBlocklink && event.key === 'ArrowRight' && this.nextBlockHeight - 2 >= 0) {
+      const prevKey = this.timeLtr ? 'ArrowLeft' : 'ArrowRight';
+      const nextKey = this.timeLtr ? 'ArrowRight' : 'ArrowLeft';
+      if (this.showPreviousBlocklink && event.key === prevKey && this.nextBlockHeight - 2 >= 0) {
         this.navigateToPreviousBlock();
       }
-      if (event.key === 'ArrowLeft') {
+      if (event.key === nextKey) {
         if (this.showNextBlocklink) {
           this.navigateToNextBlock();
         } else {
@@ -298,6 +306,7 @@ export class BlockComponent implements OnInit, OnDestroy {
     this.blocksSubscription.unsubscribe();
     this.networkChangedSubscription.unsubscribe();
     this.queryParamsSubscription.unsubscribe();
+    this.timeLtrSubscription.unsubscribe();
     this.unsubscribeNextBlockSubscriptions();
   }
 
@@ -392,8 +401,8 @@ export class BlockComponent implements OnInit, OnDestroy {
   }
 
   setNextAndPreviousBlockLink(){
-    if (this.latestBlock && this.blockHeight) {
+    if (this.latestBlock) {
-      if (this.blockHeight === 0){
+      if (!this.blockHeight){
         this.showPreviousBlocklink = false;
       } else {
         this.showPreviousBlocklink = true;

frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts

@@ -36,6 +36,8 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
   now = new Date().getTime();
   timeOffset = 0;
   showMiningInfo = false;
+  timeLtrSubscription: Subscription;
+  timeLtr: boolean;
 
   blockWidth = 125;
   blockPadding = 30;
@@ -72,6 +74,10 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
       this.location.onUrlChange((url) => this.enabledMiningInfoIfNeeded(url));
     }
 
+    this.timeLtrSubscription = this.stateService.timeLtr.subscribe((ltr) => {
+      this.timeLtr = !!ltr;
+    });
+
     if (this.stateService.network === 'liquid' || this.stateService.network === 'liquidtestnet') {
       this.feeRounding = '1.0-1';
     }
@@ -160,8 +166,10 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
       if (this.markIndex === undefined) {
         return;
       }
+      const prevKey = this.timeLtr ? 'ArrowLeft' : 'ArrowRight';
+      const nextKey = this.timeLtr ? 'ArrowRight' : 'ArrowLeft';
 
-      if (event.key === 'ArrowRight') {
+      if (event.key === prevKey) {
         if (this.mempoolBlocks[this.markIndex - 1]) {
           this.router.navigate([this.relativeUrlPipe.transform('mempool-block/'), this.markIndex - 1]);
         } else {
@@ -173,7 +181,7 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
               }
             });
         }
-      } else if (event.key === 'ArrowLeft') {
+      } else if (event.key === nextKey) {
         if (this.mempoolBlocks[this.markIndex + 1]) {
           this.router.navigate([this.relativeUrlPipe.transform('/mempool-block/'), this.markIndex + 1]);
         }
@@ -185,6 +193,7 @@ export class MempoolBlocksComponent implements OnInit, OnDestroy {
     this.markBlocksSubscription.unsubscribe();
     this.blockSubscription.unsubscribe();
     this.networkSubscription.unsubscribe();
+    this.timeLtrSubscription.unsubscribe();
     clearTimeout(this.resetTransitionTimeout);
   }
 

frontend/src/app/services/state.service.ts

@@ -6,6 +6,7 @@ import { BlockExtended, DifficultyAdjustment, OptimizedMempoolStats } from '../i
 import { Router, NavigationStart } from '@angular/router';
 import { isPlatformBrowser } from '@angular/common';
 import { map, shareReplay } from 'rxjs/operators';
+import { StorageService } from './storage.service';
 
 interface MarkBlockState {
   blockHeight?: number;
@@ -108,10 +109,12 @@ export class StateService {
   keyNavigation$ = new Subject<KeyboardEvent>();
 
   blockScrolling$: Subject<boolean> = new Subject<boolean>();
+  timeLtr: BehaviorSubject<boolean>;
 
   constructor(
     @Inject(PLATFORM_ID) private platformId: any,
     private router: Router,
+    private storageService: StorageService,
   ) {
     const browserWindow = window || {};
     // @ts-ignore
@@ -147,6 +150,11 @@ export class StateService {
     }
 
     this.blockVSize = this.env.BLOCK_WEIGHT_UNITS / 4;
+
+    this.timeLtr = new BehaviorSubject<boolean>(this.storageService.getValue('time-preference-ltr') === 'true');
+    this.timeLtr.subscribe((ltr) => {
+      this.storageService.setValue('time-preference-ltr', ltr ? 'true' : 'false');
+    });
   }
 
   setNetworkBasedonUrl(url: string) {

frontend/src/app/shared/shared.module.ts

@@ -4,7 +4,7 @@ import { NgbCollapse, NgbCollapseModule, NgbRadioGroup, NgbTypeaheadModule } fro
 import { FontAwesomeModule, FaIconLibrary } from '@fortawesome/angular-fontawesome';
 import { faFilter, faAngleDown, faAngleUp, faAngleRight, faAngleLeft, faBolt, faChartArea, faCogs, faCubes, faHammer, faDatabase, faExchangeAlt, faInfoCircle,
   faLink, faList, faSearch, faCaretUp, faCaretDown, faTachometerAlt, faThList, faTint, faTv, faAngleDoubleDown, faSortUp, faAngleDoubleUp, faChevronDown,
-  faFileAlt, faRedoAlt, faArrowAltCircleRight, faExternalLinkAlt, faBook, faListUl, faDownload, faQrcode, faArrowRightArrowLeft } from '@fortawesome/free-solid-svg-icons';
+  faFileAlt, faRedoAlt, faArrowAltCircleRight, faExternalLinkAlt, faBook, faListUl, faDownload, faQrcode, faArrowRightArrowLeft, faArrowsRotate } from '@fortawesome/free-solid-svg-icons';
 import { InfiniteScrollModule } from 'ngx-infinite-scroll';
 import { MasterPageComponent } from '../components/master-page/master-page.component';
 import { PreviewTitleComponent } from '../components/master-page-preview/preview-title.component';
@@ -291,6 +291,7 @@ export class SharedModule {
     library.addIcons(faFileAlt);
     library.addIcons(faRedoAlt);
     library.addIcons(faArrowAltCircleRight);
+    library.addIcons(faArrowsRotate);
     library.addIcons(faExternalLinkAlt);
     library.addIcons(faSortUp);
     library.addIcons(faCaretUp);