3 files changed, 82 insertions, 18 deletions

diff --git a/src/css/dumbymap.css b/src/css/dumbymap.css
index ed5f22d..a3f1fb9 100644
--- a/src/css/dumbymap.css
+++ b/src/css/dumbymap.css
@@ -2,6 +2,20 @@
   z-index: 9999;
 }
 
+@keyframes fade-in {
+  from { opacity: 0.3; }
+  to { opacity: 1; }
+}
+
+@keyframes fade-out {
+  from { opacity: 1; }
+  to { opacity: 0.3; }
+}
+
+.map-container {
+  transform-origin: top left;
+}
+
 .with-leader-line:not(:has(> *)) {
   display: inline-block;
   padding-right: 15px;
@@ -65,10 +79,19 @@
   .Showcase {
     order: 2;
     display: none;
+    overflow: visible;
+    position: relative;
 
-    .map-container {
-      width: 100% !important;
-      height: 100% !important;
+    > * {
+      position: absolute;
+      left: 0;
+      top: 0;
+      width: 100%;
+      height: 100%;
+    }
+
+    [data-focus="true"] {
+      z-index: 9999;
     }
   }
 
@@ -92,6 +115,7 @@
       background: white;
       margin: 2px;
       border: 3px solid transparent;
+      animation: fade-in 1s;
 
       &[data-focus="true"] {
         border: 3px solid gray;
@@ -99,10 +123,9 @@
     }
 
     [data-placeholder] {
-      box-sizing: border-box;
-      border: 5px solid white;
-      background: lightgray;
-      margin: 0;
+      animation: fade-out 1s;
+      opacity: 0.3;
+      border: 3px solid gray;
     }
   }
 }
@@ -141,7 +164,6 @@
 }
 
 .DumbyMap[data-layout="side"] {
-  .Showcase,
   .SemanticHtml {
     flex: 50%;
     overflow-y: scroll;
@@ -149,7 +171,9 @@
   }
 
   .Showcase {
+    flex: 50%;
     display: block;
+    height: 100vh;
   }
 }
 
@@ -210,7 +234,7 @@
         padding-bottom: 2em;
         text-align: center;
         z-index: 9999;
-        transition: all 0.3s ease-out;
+        transition: all 0.3s ease-in-out;
 
         &:hover {
           background: #e1e1e1;
@@ -228,10 +252,8 @@
       display: none;
     }
 
-    [data-placeholder] {
-      max-width: 50px;
-    }
   }
+
 }
 
 .bold-options {
diff --git a/src/css/easymde.min.css b/src/css/easymde.min.css
index cb01784..3b88351 100644
--- a/src/css/easymde.min.css
+++ b/src/css/easymde.min.css
@@ -4,4 +4,4 @@
  * @link https://github.com/ionaru/easy-markdown-editor
  * @license MIT
  */
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\ No newline at end of file
diff --git a/src/dumbymap.mjs b/src/dumbymap.mjs
index 0b42144..cfaf429 100644
--- a/src/dumbymap.mjs
+++ b/src/dumbymap.mjs
@@ -24,6 +24,35 @@ const onRemove = (element, callback) => {
   });
   obs.observe(parent, { childList: true, });
 }
+const animateRectTransition = (child, rect, resume = false) => {
+  const { width: w1, height: h1, left: x1, top: y1 } = rect
+  const { width: w2, height: h2, left: x2, top: y2 } = child.getBoundingClientRect()
+
+  const rw = w1 / w2
+  const rh = h1 / h2
+  const dx = x1 - x2;
+  const dy = y1 - y2;
+
+  if (dx === 0 && dy === 0) {
+    return;
+  }
+
+  const transform1 = `translate(0, 0) scale(1, 1)`;
+  const transform2 = `translate(${dx}px, ${dy}px) scale(${rw}, ${rh})`;
+  const keyframes = [
+    { transform: transform1, opacity: 1 },
+    { transform: transform2, opacity: 0.3 },
+  ]
+
+  return child.animate(
+    resume
+      ? keyframes.reverse()
+      : keyframes,
+    {
+      duration: 300,
+      easing: 'ease-in-out',
+    });
+}
 // }}}
 // FUNCTION: Get DocLinks from special anchor element {{{
 
@@ -253,16 +282,29 @@ export const generateMaps = async (container, callback) => {
     if (shouldBeInShowcase) {
       if (showcase.contains(target)) return
 
-      const placeholder = document.createElement('div')
+      // Placeholder for map in Showcase, it should has the same rect
+      const placeholder = target.cloneNode(true)
+      placeholder.classList.remove('map-container')
       placeholder.setAttribute('data-placeholder', target.id)
-      placeholder.style.width = target.style.width
       target.parentElement.replaceChild(placeholder, target)
+
+      // To fit showcase, remove all inline style
+      target.style = ""
       showcase.appendChild(target)
+
+      // Resume rect from Semantic HTML to Showcase, with animation
+      animateRectTransition(target, placeholder.getBoundingClientRect(), true)
     } else if (showcase.contains(target)) {
       const placeholder = htmlHolder.querySelector(`[data-placeholder="${target.id}"]`)
       if (!placeholder) throw Error(`Cannot fine placeholder for map "${target.id}"`)
-      placeholder.parentElement.replaceChild(target, placeholder)
-      placeholder.remove()
+
+      animateRectTransition(target, placeholder.getBoundingClientRect())
+        .finished
+        .finally(() => {
+          placeholder.parentElement.replaceChild(target, placeholder)
+          target.style = placeholder.style.cssText
+          placeholder.remove()
+        })
     }
   })
   // }}}
@@ -343,7 +385,7 @@ export const generateMaps = async (container, callback) => {
           top: y,
         })
 
-        // Set initial postion side by side
+        // Set initial position side by side
         x += parseInt(window.getComputedStyle(block).width) + 50
         if (x > window.innerWidth) {
           y += 200