From 5c0a292a1518976d653d9a917669a2edc0c685eb Mon Sep 17 00:00:00 2001
From: Hsieh Chin Fan <pham@topo.tw>
Date: Sat, 21 Sep 2024 10:50:03 +0800
Subject: refactor: apply Layout Class

* Use {name, enterHandler, leaverHandler} for layout switch
* Move "overlay" to another module
---
 src/OverlayLayout.mjs | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 src/OverlayLayout.mjs

(limited to 'src/OverlayLayout.mjs')

diff --git a/src/OverlayLayout.mjs b/src/OverlayLayout.mjs
new file mode 100644
index 0000000..c87033b
--- /dev/null
+++ b/src/OverlayLayout.mjs
@@ -0,0 +1,80 @@
+import PlainDraggable from 'plain-draggable'
+import { onRemove } from './utils'
+
+export class OverlayLayout {
+  name = "overlay"
+
+  enterHandler = (dumbymap) => {
+    const container = dumbymap.htmlHolder
+    const moveIntoDraggable = (block) => {
+      // Create draggable block
+      const draggableBlock = document.createElement('div')
+      draggableBlock.classList.add('draggable-block')
+
+      // Add draggable part
+      const draggablePart = document.createElement('div');
+      draggablePart.classList.add('draggable')
+      draggablePart.textContent = '☰'
+      draggablePart.title = 'Use middle-click to remove block'
+      draggablePart.onmouseup = (e) => {
+        if (e.button === 1) {
+          // Hide block with middle click
+          draggableBlock.style.display = "none";
+        }
+      }
+
+      // Set elements
+      draggableBlock.appendChild(draggablePart)
+      draggableBlock.appendChild(block)
+      container.appendChild(draggableBlock)
+
+      // Add draggable instance
+      const draggableInstance = new PlainDraggable(draggableBlock, {
+        handle: draggablePart,
+        snap: { x: { step: 20 }, y: { step: 20 } },
+      })
+
+      // Reposition draggable instance when resized
+      new ResizeObserver(() => {
+        try {
+          draggableInstance.position();
+        } catch (_) {
+          null
+        }
+      }).observe(draggableBlock);
+
+      // Callback for remove
+      onRemove(draggableBlock, () => {
+        draggableInstance.remove()
+      })
+
+      return draggableInstance
+    }
+
+    // Create draggable blocks and set each position by previous one
+    let [x, y] = [0, 0]
+    dumbymap.blocks.map(moveIntoDraggable)
+      .forEach(draggable => {
+        draggable.left = x
+        draggable.top = y
+        const rect = draggable.element.getBoundingClientRect()
+        x += rect.width + 30
+        if (x > window.innerWidth) {
+          y += 200
+          x = x % window.innerWidth
+        }
+      })
+  }
+  leaveHandler = (dumbymap) => {
+    const container = dumbymap.htmlHolder
+    const resumeFromDraggable = (block) => {
+      const draggableContainer = block.closest('.draggable-block')
+      if (!draggableContainer) return
+      container.appendChild(block)
+      block.removeAttribute('style')
+      draggableContainer.remove()
+    }
+    dumbymap.blocks.forEach(resumeFromDraggable)
+  }
+}
+
-- 
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