1 files changed, 0 insertions, 136 deletions

diff --git a/viewer/src/services/ldzoom.ts b/viewer/src/services/ldzoom.ts
deleted file mode 100644
index 22d4699..0000000
--- a/viewer/src/services/ldzoom.ts
+++ /dev/null
@@ -1,136 +0,0 @@
-/* ldgallery - A static generator which turns a collection of tagged
---             pictures into a searchable web gallery.
---
--- Copyright (C) 2020  Pacien TRAN-GIRARD
---
--- This program is free software: you can redistribute it and/or modify
--- it under the terms of the GNU Affero General Public License as
--- published by the Free Software Foundation, either version 3 of the
--- License, or (at your option) any later version.
---
--- This program is distributed in the hope that it will be useful,
--- but WITHOUT ANY WARRANTY; without even the implied warranty of
--- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--- GNU Affero General Public License for more details.
---
--- You should have received a copy of the GNU Affero General Public License
--- along with this program.  If not, see <https://www.gnu.org/licenses/>.
-*/
-
-// polyfill still required for IE and Safari, see https://caniuse.com/#feat=resizeobserver
-import ResizeObserver from "resize-observer-polyfill";
-import "hammerjs";
-
-/**
- * Mousewheel and pinch zoom handler.
- */
-export default class LdZoom {
-  readonly containerElement: HTMLDivElement;
-  readonly imageElement: HTMLImageElement;
-  readonly pictureProperties: Gallery.PictureProperties;
-  readonly maxScaleFactor: number;
-  readonly scrollZoomSpeed: number;
-  scaleFactor: number = 0.0;
-
-  constructor(
-    containerElement: HTMLDivElement,
-    imageElement: HTMLImageElement,
-    pictureProperties: Gallery.PictureProperties,
-    maxScaleFactor: number,
-    scrollZoomSpeed: number
-  ) {
-    this.containerElement = containerElement;
-    this.imageElement = imageElement;
-    this.pictureProperties = pictureProperties;
-    this.maxScaleFactor = maxScaleFactor;
-    this.scrollZoomSpeed = scrollZoomSpeed;
-  }
-
-  /**
-   * Register event listeners.
-   */
-  public install() {
-    this.updateImageScale(this.scaleFactor);
-
-    new ResizeObserver(() => {
-      this.updateImageScale(this.scaleFactor);
-    }).observe(this.containerElement);
-
-    this.containerElement.addEventListener("wheel", wheelEvent => {
-      wheelEvent.preventDefault();
-      const scaleFactor = this.scaleFactor - Math.sign(wheelEvent.deltaY) * this.scrollZoomSpeed;
-      this.zoom(wheelEvent.offsetX, wheelEvent.offsetY, scaleFactor);
-    });
-
-    const pinchListener = new Hammer(this.containerElement);
-    pinchListener.get("pinch").set({ enable: true });
-    this.installPinchHandler(pinchListener);
-  }
-
-  private installPinchHandler(pinchListener: HammerManager) {
-    let startScaleFactor = 0.0;
-
-    pinchListener.on("pinchstart", (pinchEvent: HammerInput) => {
-      startScaleFactor = this.scaleFactor;
-    });
-
-    pinchListener.on("pinchmove", (pinchEvent: HammerInput) => {
-      const focusX = pinchEvent.center.x + this.containerElement.scrollLeft;
-      const focusY = pinchEvent.center.y + this.containerElement.scrollTop;
-      const scaleFactor = pinchEvent.scale * startScaleFactor;
-      this.zoom(focusX, focusY, scaleFactor);
-    });
-  }
-
-  /**
-   * Returns the picture resolution as it should be displayed.
-   */
-  private getDisplayResolution(): Gallery.Resolution {
-    return {
-      width: this.pictureProperties.resolution.width * this.scaleFactor,
-      height: this.pictureProperties.resolution.height * this.scaleFactor,
-    };
-  }
-
-  /**
-   * Applies scaling to the DOM image element.
-   * To call after internal intermediate computations because DOM properties aren't stable.
-   */
-  private resizeImageElement() {
-    const imageDim = this.getDisplayResolution();
-    this.imageElement.width = imageDim.width;
-    this.imageElement.height = imageDim.height;
-  }
-
-  /**
-   * Centers the image element inside its container if it fits, or stick to the top and left borders otherwise.
-   * It's depressingly hard to do in pure CSS…
-   */
-  private recenterImageElement() {
-    const imageDim = this.getDisplayResolution();
-    const marginLeft = Math.max((this.containerElement.clientWidth - imageDim.width) / 2, 0);
-    const marginTop = Math.max((this.containerElement.clientHeight - imageDim.height) / 2, 0);
-    this.imageElement.style.marginLeft = `${marginLeft}px`;
-    this.imageElement.style.marginTop = `${marginTop}px`;
-  }
-
-  private zoom(focusX: number, focusY: number, scaleFactor: number) {
-    const imageDim = this.getDisplayResolution();
-    const ratioX = focusX / imageDim.width;
-    const ratioY = focusY / imageDim.height;
-    this.updateImageScale(Math.min(scaleFactor, this.maxScaleFactor));
-
-    const newImageDim = this.getDisplayResolution();
-    this.containerElement.scrollLeft -= focusX - ratioX * newImageDim.width;
-    this.containerElement.scrollTop -= focusY - ratioY * newImageDim.height;
-  }
-
-  private updateImageScale(newScaleFactor: number) {
-    const horizontalFillRatio = this.containerElement.clientWidth / this.pictureProperties.resolution.width;
-    const verticalFillRatio = this.containerElement.clientHeight / this.pictureProperties.resolution.height;
-    const minScaleFactor = Math.min(horizontalFillRatio, verticalFillRatio, 1.0);
-    this.scaleFactor = Math.max(newScaleFactor, minScaleFactor);
-    this.resizeImageElement();
-    this.recenterImageElement();
-  }
-}