Merge pull request #1 from curiousRay/203-zoom-image-improved

New method of displaying the full screen image, rather than invoking the browser's API

src/components/MDXComponents/ImageZoomable.tsx

@@ -1,4 +1,4 @@
-import { Box, Fade, IconButton, Tooltip } from "@mui/material";
+import { Box, Fade, IconButton} from "@mui/material";
 
 import ZoomInIcon from "@mui/icons-material/ZoomIn";
 import ZoomOutIcon from "@mui/icons-material/ZoomOut";
@@ -10,7 +10,6 @@ import React, {
     PropsWithChildren,
     useRef,
     useState,
-    useEffect,
   } from "react";
 import { TransformWrapper, TransformComponent } from "react-zoom-pan-pinch";
 
@@ -32,56 +31,44 @@ export const ImageZoomable: React.FC<ImageZoomableWrapperProps> = ({ src, alt })
   const fullscreen = () => {
     if (ImageZoomableRef.current) {
       if (isFullscreen) {
-        document.exitFullscreen();
-      } else {
-        ImageZoomableRef.current.requestFullscreen()
-          .catch((err) => {
-            console.error(`Error in enabling fullscreen mode: ${err.message}`);
-          });
-      }
-    }
-  }
-
-  useEffect(() => {
-    window.onresize = () => {
-      setIsFullScreen((document.fullscreenElement != null) ? true: false);
-      if (document.fullscreenElement) {
-
-        // when entered fullscreen, set image position to flex-centered for better display
-        const ele = document.fullscreenElement as HTMLElement
-        ele.style.display = 'flex';
-        ele.style.alignItems = 'center';
-        ele.style.justifyContent = 'center';
-        ele.style.flexFlow = 'column-reverse';
+        setIsFullScreen(false);
+        let ele_overlay = ImageZoomableRef.current.getElementsByClassName("zoom-overlay")[0] as HTMLElement;
+        ele_overlay.style.opacity = "0";
+        ele_overlay.style.transition = "opacity .15s ease-in-out";
 
-        // when entered fullscreen, unset 'position:absolute' zoom button group for better display
-        const ele2 = ele.querySelector(".ZoomButtonGroup") as HTMLElement;
-        ele2.style.position = 'unset';
+        ImageZoomableRef.current.parentElement!.style.height = "unset";
+        ImageZoomableRef.current.parentElement!.style.border = "none";
 
       } else {
-        if (ImageZoomableRef.current) {
-
-          // exited fullscreen and back to normal position
-          ImageZoomableRef.current.style.display = 'block';
 
-          // exited fullscreen and restore 'position:absolute' of zoom button group
-          const ele2 = ImageZoomableRef.current.querySelector(".ZoomButtonGroup") as HTMLElement;
-          ele2.style.position = 'absolute';
-        }
+        setIsFullScreen(true);
+        let ele_overlay = ImageZoomableRef.current.getElementsByClassName("zoom-overlay")[0] as HTMLElement;
+        ele_overlay.style.opacity = "1";
+        ele_overlay.style.transition = "opacity .3s ease-in-out";
+
+        ImageZoomableRef.current.parentElement!.style.height = "50px";
+        ImageZoomableRef.current.parentElement!.style.border = "1px grey dashed";
+
       }
     }
-  })
+  }
 
   return (
     <Box
       className="ImageZoomableContainer"
       ref={ImageZoomableRef}
+      sx={{
+        position: (isFullscreen ? "fixed" : "inherit"),
+        zIndex: (isFullscreen ? "10001" : "inherit")
+      }}
       onMouseEnter={() => {
         contextCursor = "grab";
         setIsHovered(true);
       }}
       onMouseLeave={() => {
-        setIsHovered(false);
+        if (!isFullscreen) {
+          setIsHovered(false);
+        }
       }}
       onMouseDown={() => {
         setIsDragging(true);
@@ -101,6 +88,7 @@ export const ImageZoomable: React.FC<ImageZoomableWrapperProps> = ({ src, alt })
         }, 4000);
       }}
       >
+
       <TransformWrapper
         initialScale={1}
         initialPositionX={0}
@@ -112,34 +100,37 @@ export const ImageZoomable: React.FC<ImageZoomableWrapperProps> = ({ src, alt })
               <Box
                 className="ZoomButtonGroup"
                 sx={{
-                  position: 'absolute',
-                  float: 'left',
-                  zIndex: 99,
-                  backgroundColor: 'rgb(229,229,229)',
+                  position: (isFullscreen ? "fixed" : "absolute"),
+                  float: "left",
+                  zIndex: (isFullscreen ? 99999 : 99),
+                  backgroundColor: "rgb(229,229,229)",
                   borderRadius: 18,
-                  marginTop: '.5rem',
-                  marginLeft: '.5rem',
+                  marginTop: ".5rem",
+                  marginLeft: ".5rem",
+                  transform: (isFullscreen ? "translate(-50%,-50%)" : "inherit"),
+                  left: (isFullscreen ? "50%" : "inherit"),
+                  top: (isFullscreen ? "95%" : "inherit")
                 }}>
                 <IconButton
-                  aria-label='btn-zoomin'
+                  aria-label="btn-zoomin"
                   onClick={() => zoomIn()}
                 >
                   <ZoomInIcon fontSize={contextIconSize}/>
                 </IconButton>
                 <IconButton
-                  aria-label='btn-zoomout'
+                  aria-label="btn-zoomout"
                   onClick={() => zoomOut()}
                 >
                   <ZoomOutIcon fontSize={contextIconSize}/>
                 </IconButton>
                 <IconButton
-                  aria-label='btn-zoomreset'
+                  aria-label="btn-zoomreset"
                   onClick={() => resetTransform()}
                 >
                   <AutorenewIcon fontSize={contextIconSize}/>
                 </IconButton>
                 <IconButton
-                  aria-label= { isFullscreen ? ('btn-fullscreen-exit') : ('btn-fullscreen') } 
+                  aria-label= { isFullscreen ? "btn-fullscreen-exit" : "btn-fullscreen" } 
                   onClick={() => fullscreen()}
                 >
                   { isFullscreen ? (
@@ -149,12 +140,32 @@ export const ImageZoomable: React.FC<ImageZoomableWrapperProps> = ({ src, alt })
                 </IconButton>
               </Box>
             </Fade>
-            <TransformComponent contentStyle={{ cursor: contextCursor }}>
+            <TransformComponent
+              contentStyle={{ cursor: contextCursor }}
+              wrapperStyle={{
+                position: (isFullscreen ? "fixed" : "inherit"),
+                zIndex: (isFullscreen ? "99999" : "inherit"),
+                left: (isFullscreen ? "50%" : "inherit"),
+                top: (isFullscreen ? "50%" : "inherit"),
+                transform: (isFullscreen ? "translate(-50%,-50%) scale(1.6)" : "inherit"),
+                transition: "transform .3s cubic-bezier(.2,0,.2,1)",
+              }}>
               <img src={src} alt={alt}/>
             </TransformComponent>
           </React.Fragment>
         )}
       </TransformWrapper>
+      <Box
+        className="zoom-overlay"
+        sx={{
+          backgroundColor: "rgba(0,0,0,0.7)",
+          opacity: "0",
+          position: "fixed",
+          zIndex: "99998",
+          inset: "0",
+          pointerEvents: "none"
+        }}
+      />
     </Box>
   );
 };