From d0ba142b729c7c7588741a9009cb20285d4f6138 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C5=A0imon=20Brandner?= Date: Sat, 24 Apr 2021 09:41:46 +0200 Subject: [PATCH] Add some comments MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Šimon Brandner --- src/components/views/elements/ImageView.tsx | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/components/views/elements/ImageView.tsx b/src/components/views/elements/ImageView.tsx index a836409d4d..1679c40e76 100644 --- a/src/components/views/elements/ImageView.tsx +++ b/src/components/views/elements/ImageView.tsx @@ -115,9 +115,18 @@ export default class ImageView extends React.Component { // TODO: What if we don't have width and height props? const imageWrapper = document.getElementsByClassName(IMAGE_WRAPPER_CLASS)[0]; + const zoomX = imageWrapper.clientWidth / this.props.width; const zoomY = imageWrapper.clientHeight / this.props.height; + // We set minZoom to the min of the zoomX and zoomY to avoid overflow in + // any direction. We also multiply by MAX_SCALE to get a gap around the + // image by default const minZoom = Math.min(zoomX, zoomY) * MAX_SCALE; + // If minZoom is bigger or equal to 1, it means we scaling the image up + // to fit the viewport and therefore we want to disable zooming, so we + // set the maxZoom to be the same as the minZoom. Otherwise, we are + // scaling the image down - we want the user to be allowed to zoom to + // 100% const maxZoom = minZoom >= 1 ? minZoom : 1; if (this.state.zoom <= this.state.minZoom) this.setState({zoom: minZoom});