feat: add resize bar for side-by-side layout

* SVG comes from maplibre-gl-compare
* plain-draggable is awesome!

3 files changed, 119 insertions, 32 deletions

diff --git a/src/Layout.mjs b/src/Layout.mjs
index 861f56b..5673722 100644
--- a/src/Layout.mjs
+++ b/src/Layout.mjs
@@ -11,7 +11,48 @@ export class Layout {
   valueOf = () => this.name
 }
 
-export class OverlayLayout extends Layout {
+export class SideBySide extends Layout {
+  name = "side-by-side"
+
+  enterHandler = ({ container, htmlHolder, showcase }) => {
+    const bar = document.createElement('div')
+    bar.className = 'bar'
+    bar.innerHTML = '<div class="bar-handle"></div>'
+    const handle = bar.querySelector('.bar-handle')
+    container.appendChild(bar)
+
+    const resizeByLeft = (left) => {
+      htmlHolder.style.width = (left) + "px"
+      showcase.style.width = (parseFloat(getComputedStyle(container).width) - left) + "px"
+    }
+
+    const draggable = new PlainDraggable(bar, {
+      handle: handle,
+      containment: { left: '25%', top: 0, right: '75%', height: 0 },
+    })
+    draggable.draggableCursor = "grab"
+    draggable.onDrag = (pos) => {
+      handle.style.transform = 'unset'
+      resizeByLeft(pos.left)
+    }
+    draggable.onDragEnd = (_) => {
+      handle.removeAttribute('style')
+    }
+
+    new ResizeObserver(() => {
+      if (draggable) resizeByLeft(draggable.left)
+    }).observe(container);
+  }
+
+  leaveHandler = ({ container, htmlHolder, showcase }) => {
+    container.removeAttribute('style')
+    htmlHolder.removeAttribute('style')
+    showcase.removeAttribute('style')
+    container.querySelector('.bar')?.remove()
+  }
+}
+
+export class Overlay extends Layout {
   name = "overlay"
 
   enterHandler = (dumbymap) => {
diff --git a/src/css/dumbymap.css b/src/css/dumbymap.css
index 68a73c0..f58cf22 100644
--- a/src/css/dumbymap.css
+++ b/src/css/dumbymap.css
@@ -80,7 +80,6 @@
 }
 
 .DumbyMap {
-  display: flex;
   width: 100%;
   height: 100%;
   margin: 0 auto;
@@ -89,32 +88,10 @@
   position: relative;
   overflow-x: auto;
 
-  .Showcase {
-    display: none;
-    overflow: visible;
-
-    position: relative;
-    order: 2;
-
-    > * {
-      width: 100%;
-      height: 100%;
-
-      position: absolute;
-      top: 0;
-      left: 0;
-    }
-
-    [data-focus="true"] {
-      z-index: 1;
-    }
-  }
-
   .SemanticHtml {
-    width: 100%;
+    height: 100%;
     padding: 1.5rem;
     overflow-y: auto;
-    order: 1;
 
     pre {
       width: 100%;
@@ -149,6 +126,28 @@
       animation: fade-out 1s;
     }
   }
+
+  .Showcase {
+    display: none;
+    overflow: visible;
+    height: 100%;
+
+    position: relative;
+
+    > * {
+      width: 100%;
+      height: 100%;
+
+      position: absolute;
+      top: 0;
+      left: 0;
+    }
+
+    [data-focus="true"] {
+      z-index: 1;
+    }
+  }
+
 }
 
 .DumbyMap[data-layout="normal"] {
@@ -156,14 +155,60 @@
 }
 
 .DumbyMap[data-layout="side-by-side"] {
-  display: flex;
-
   .SemanticHtml,
   .Showcase {
-    flex: 50%;
+    width: 50%;
 
+    position: absolute;
+    top: 0;
+    min-width: 20%;
+  }
+
+  .SemanticHtml {
+    left: 0;
+  }
+
+  .Showcase {
     display: block;
+
+    right: 0;
+  }
+
+  .bar {
+    display: flex;
+    overflow: visible;
+    width: 1px;
     height: 100%;
+
+    position: absolute;
+    left: 50%;
+    z-index: 9999;
+
+    border: 2px black solid;
+
+    .bar-handle {
+      display: inline-block;
+      width: 60px;
+      height: 60px;
+
+      position: absolute;
+      top: calc(50% - 30px);
+      left: -30px;
+
+      border-radius: 50%;
+
+      background-color: #3887be;
+      background-image: url("data:image/svg+xml;base64,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");
+
+      transition: transform 0.3s ease-in-out;
+      transform: scale(0.5, 0.5);
+      box-shadow: inset 0 0 0 2px white;
+
+      &:hover {
+        transform: unset;
+      }
+    }
+
   }
 }
 
diff --git a/src/dumbymap.mjs b/src/dumbymap.mjs
index a785d6f..87ea694 100644
--- a/src/dumbymap.mjs
+++ b/src/dumbymap.mjs
@@ -6,15 +6,15 @@ import MarkdownItTocDoneRight from 'markdown-it-toc-done-right'
 import LeaderLine from 'leader-line'
 import { renderWith, defaultAliases, parseConfigsFromYaml } from 'mapclay'
 import { onRemove, animateRectTransition, throttle } from './utils'
-import { Layout, OverlayLayout } from './Layout'
+import { Layout, SideBySide, Overlay } from './Layout'
 
 const docLinkSelector = 'a[href^="#"][title^="=>"]'
 const geoLinkSelector = 'a[href^="geo:"]'
 
 const layouts = [
   new Layout({ name: "normal" }),
-  new Layout({ name: "side-by-side" }),
-  new OverlayLayout({ name: "overlay" }),
+  new SideBySide({ name: "side-by-side" }),
+  new Overlay({ name: "overlay" }),
 ]
 
 // FUNCTION: Get DocLinks from special anchor element {{{
@@ -144,9 +144,10 @@ export const generateMaps = async (container, callback) => {
   showcase.classList.add('Showcase')
 
   const dumbymap = {
-    blocks: Array.from(htmlHolder.querySelectorAll('.dumby-block')),
+    container: container,
     htmlHolder: htmlHolder,
     showcase: showcase,
+    blocks: Array.from(htmlHolder.querySelectorAll('.dumby-block')),
   }
 
   container.classList.add('DumbyMap')