Add zoom to gallery view

Signed-off-by: trivernis <trivernis@protonmail.com>

mediarepo-ui/src/app/app.module.ts

@@ -42,6 +42,7 @@ import {BlockUIModule} from "primeng/blockui";
 import {PanelModule} from "primeng/panel";
 import {DragDropModule} from "@angular/cdk/drag-drop";
 import { ContentAwareImageComponent } from './components/content-aware-image/content-aware-image.component';
+import {MatSliderModule} from "@angular/material/slider";
 
 @NgModule({
   declarations: [
@@ -90,6 +91,7 @@ import { ContentAwareImageComponent } from './components/content-aware-image/con
         BlockUIModule,
         PanelModule,
         DragDropModule,
+        MatSliderModule,
     ],
   providers: [],
   bootstrap: [AppComponent]

mediarepo-ui/src/app/components/content-aware-image/content-aware-image.component.ts

@@ -22,10 +22,8 @@ export class ContentAwareImageComponent {
   public adjustSize(image: HTMLImageElement, imageContainer: HTMLDivElement): void {
     const containerHeight = Math.abs(imageContainer.clientHeight);
     const containerWidth = Math.abs(imageContainer.clientWidth);
-    console.log(containerHeight, ',', containerWidth);
     const imageRelativeHeight = image.height / containerHeight;
     const imageRelativeWidth = image.width / containerWidth;
-    console.log(imageRelativeHeight, ',', imageRelativeWidth);
     this.scaleWidth = imageRelativeWidth > imageRelativeHeight;
   }
 }

mediarepo-ui/src/app/components/file-gallery/file-gallery.component.html

@@ -4,11 +4,22 @@
   </button>
   <div class="file-full-view" fxFlex="80%"
        (dblclick)="this.selectedFile? this.fileDblClickEvent.emit(this.selectedFile.data) : null">
-    <div class="file-full-view-inner" #imageContainer>
+    <div class="file-full-view-inner">
       <div *ngIf="!this.fileContentUrl" class="url-loading-backdrop">
         <mat-progress-spinner mode="indeterminate" color="primary"></mat-progress-spinner>
       </div>
-      <app-content-aware-image *ngIf="this.fileContentUrl" [imageSrc]="this.fileContentUrl"></app-content-aware-image>
+      <div class="zoom-slider">
+        <mat-slider min="0.5" max="4" [value]="this.imageZoom"
+                    (input)="this.imageZoom=$event.value ?? 1" vertical step="0.1"></mat-slider>
+        <button mat-icon-button (click)="this.resetImage()">
+          <mat-icon>refresh</mat-icon>
+        </button>
+      </div>
+      <div #imageDragContainer [cdkDragFreeDragPosition]="this.imagePosition" (cdkDragMoved)="this.onDragMoved($event)" *ngIf="this.fileContentUrl" cdkDrag class="image-drag-container">
+        <div #scaledImage class="image-scale-container" [style]="{scale: this.imageZoom}">
+          <app-content-aware-image [imageSrc]="this.fileContentUrl"></app-content-aware-image>
+        </div>
+      </div>
     </div>
   </div>
   <mat-divider fxFlex></mat-divider>

mediarepo-ui/src/app/components/file-gallery/file-gallery.component.scss

@@ -13,6 +13,7 @@
   height: 100%;
   width: 100%;
   position: relative;
+  user-select: none;
 }
 
 app-file-gallery-entry, .file-item {
@@ -28,6 +29,7 @@ app-file-gallery-entry {
 .file-full-view {
   width: 100%;
   height: 100%;
+  overflow: hidden;
 }
 
 .file-full-view-inner {
@@ -63,3 +65,30 @@ app-content-aware-image {
     margin: auto;
   }
 }
+
+.image-drag-container, .image-scale-container {
+  height: 100%;
+  width: 100%;
+}
+
+.image-scale-container {
+  display: block;
+}
+
+.zoom-slider {
+  position: absolute;
+  display: flex;
+  flex-direction: column;
+  right: 1em;
+  bottom: 1em;
+  z-index: 10;
+  opacity: 0.5;
+  padding: 1em 0.5em;
+  transition-duration: 0.2s;
+}
+
+.zoom-slider:hover {
+  opacity: 1;
+  background-color: rgba(0, 0, 0, 0.3);
+  border-radius: 1em;
+}

mediarepo-ui/src/app/components/file-gallery/file-gallery.component.ts

@@ -11,6 +11,7 @@ import {FileService} from "../../services/file/file.service";
 import {SafeResourceUrl} from "@angular/platform-browser";
 import {Selectable} from "../../models/Selectable";
 import {CdkVirtualScrollViewport} from "@angular/cdk/scrolling";
+import {CdkDrag, CdkDragMove, DragRef, Point} from "@angular/cdk/drag-drop";
 
 @Component({
   selector: 'app-file-gallery',
@@ -27,10 +28,13 @@ export class FileGalleryComponent implements OnChanges, OnInit {
   entries: Selectable<File>[] = [];
 
   @ViewChild("virtualScroll") virtualScroll!: CdkVirtualScrollViewport;
+  @ViewChild("scaledImage") scaledImage: ElementRef<HTMLDivElement> | undefined;
+  @ViewChild("imageDragContainer") imageDragContainer: ElementRef<HTMLDivElement> | undefined;
 
   public selectedFile: Selectable<File> | undefined;
   fileContentUrl: SafeResourceUrl | undefined;
-  scaleWidth = false;
+  public imageZoom = 1;
+  public imagePosition = {x: 0, y: 0};
 
   constructor(private fileService: FileService) {
   }
@@ -42,6 +46,7 @@ export class FileGalleryComponent implements OnChanges, OnInit {
    */
   async onEntrySelect(entry: Selectable<File>) {
     if (entry) {
+      this.resetImage();
       this.selectedFile?.unselect();
       entry.select();
       this.selectedFile = entry;
@@ -58,7 +63,8 @@ export class FileGalleryComponent implements OnChanges, OnInit {
   async loadSelectedFile() {
     if (this.selectedFile) {
       this.fileContentUrl = undefined;
-      this.fileContentUrl = await this.fileService.readFile(this.selectedFile.data);
+      this.fileContentUrl = await this.fileService.readFile(
+        this.selectedFile.data);
     }
   }
 
@@ -69,8 +75,10 @@ export class FileGalleryComponent implements OnChanges, OnInit {
   }
 
   public async ngOnChanges(changes: SimpleChanges): Promise<void> {
-    this.entries = this.files.map(f => new Selectable(f, f.hash == this.selectedFile?.data.hash));
-    const selectedIndex = this.files.findIndex(f => f.hash === this.selectedFile?.data.hash);
+    this.entries = this.files.map(
+      f => new Selectable(f, f.hash == this.selectedFile?.data.hash));
+    const selectedIndex = this.files.findIndex(
+      f => f.hash === this.selectedFile?.data.hash);
 
     if (!this.selectedFile || selectedIndex < 0) {
       await this.onEntrySelect(this.getPreselectedEntry() ?? this.entries[0])
@@ -111,6 +119,11 @@ export class FileGalleryComponent implements OnChanges, OnInit {
     }
   }
 
+  public resetImage() {
+    this.imageZoom = 1;
+    this.imagePosition = {x: 0, y: 0};
+  }
+
   @HostListener("window:keydown", ["$event"])
   private async handleKeydownEvent(event: KeyboardEvent) {
     switch (event.key) {
@@ -120,12 +133,33 @@ export class FileGalleryComponent implements OnChanges, OnInit {
       case "ArrowLeft":
         await this.previousItem();
         break;
+      case "Escape":
+        this.resetImage();
+        break;
+    }
+  }
+
+  @HostListener("mousewheel", ["$event"])
+  private handleScroll(event: any) {
+    const delta = event.wheelDelta ?? event.detail
+
+    if (delta > 0) {
+      this.imageZoom += 0.2
+      if (this.imageZoom > 4) {
+        this.imageZoom = 4;
+      }
+    } else if (delta < 0) {
+      this.imageZoom -= 0.2
+      if (this.imageZoom < 0.5) {
+        this.imageZoom = 0.5;
+      }
     }
   }
 
   private getPreselectedEntry(): Selectable<File> | undefined {
     if (this.preselectedFile) {
-      const entry = this.entries.find(e => e.data.hash == this.preselectedFile?.hash);
+      const entry = this.entries.find(
+        e => e.data.hash == this.preselectedFile?.hash);
       if (entry) {
         return entry;
       }
@@ -133,10 +167,8 @@ export class FileGalleryComponent implements OnChanges, OnInit {
     return undefined;
   }
 
-  public adjustImageSize(fullImage: HTMLImageElement, imageContainer: HTMLDivElement): void {
-    const containerRatio = imageContainer.clientHeight / imageContainer.clientWidth;
-    const imageAdjHeight = fullImage.height / containerRatio;
-    const imageAdjWidth = fullImage.width * containerRatio;
-    this.scaleWidth = imageAdjWidth > imageAdjHeight;
+  public onDragMoved($event: CdkDragMove<HTMLDivElement>): void {
+    this.imagePosition.x += $event.delta.x;
+    this.imagePosition.y += $event.delta.y;
   }
 }

mediarepo-ui/src/app/pages/home/search-page/search-page.component.html

@@ -26,7 +26,7 @@
                      (fileMultiselectEvent)="onFileMultiSelect($event)"
       ></app-file-grid>
       <app-file-gallery *ngIf="this.showGallery" [files]="files" (fileSelectEvent)="onFileSelect($event)"
-                        (fileDblClickEvent)="openFile($event)" [preselectedFile]="this.preselectedFile"
+                        [preselectedFile]="this.preselectedFile"
                         (closeEvent)="this.closeGallery($event.selectedFile?.data)"></app-file-gallery>
   </mat-drawer-content>
 </mat-drawer-container>

mediarepo-ui/src/app/pages/home/search-page/search-page.component.ts

@@ -86,19 +86,6 @@ export class SearchPageComponent implements OnInit {
     event.source.deselectAll();
   }
 
-  async openFile(file: File) {
-    if (this.openingLightbox) {
-      return;
-    }
-    this.openingLightbox = true;
-    try {
-      await this.openLightbox(file);
-    } catch (err) {
-      this.errorBroker.showError(err);
-    }
-    this.openingLightbox = false;
-  }
-
   async openGallery(preselectedFile: File) {
     this.preselectedFile = preselectedFile;
     this.showGallery = true;
@@ -108,29 +95,4 @@ export class SearchPageComponent implements OnInit {
     this.preselectedFile = preselectedFile;
     this.showGallery = false;
   }
-
-  private async openLightbox(file: File): Promise<void> {
-    let url = await this.fileService.readFile(file);
-
-    let albums = [
-      {
-        src: url as string,
-        caption: file.name ?? file.comment,
-        thumb: url as string,
-      }
-    ];
-    this.lightbox.open(albums, 0, {
-      disableScrolling: true,
-      showImageNumberLabel: false,
-      showDownloadButton: true,
-      centerVertically: true,
-    });
-    const lighboxSubscription = this.lightboxEvent.lightboxEvent$.subscribe(
-      (event: any) => {
-        if (event?.id == LIGHTBOX_EVENT.CLOSE) {
-          lighboxSubscription.unsubscribe();
-          URL?.revokeObjectURL(url as string);
-        }
-      })
-  }
 }