fixed widget dragging inside the canvas

src/canvas/widgets/base.js

@@ -10,6 +10,8 @@ import DraggableWrapper from "../../components/draggable/draggable"
 import DroppableWrapper from "../../components/draggable/droppable"
 
 import { ActiveWidgetContext } from "../activeWidgetContext"
+import { DragWidgetProvider } from "./draggableWidgetContext"
+import WidgetDraggable from "./widgetDragDrop"
 
 
 /**
@@ -521,8 +523,13 @@ class Widget extends React.Component {
 
         // console.log("selected: ", this.state.selected)
         return (
-                <div data-id={this.__id} ref={this.elementRef} className="tw-absolute tw-shadow-xl tw-w-fit tw-h-fit"
+            <WidgetDraggable widgetRef={this.elementRef}>
+                <div data-widget-id={this.__id} 
+                        ref={this.elementRef} 
+                        className="tw-absolute tw-shadow-xl tw-w-fit tw-h-fit"
                         style={outerStyle}
+                        data-draggable-type={this.getWidgetType()} // helps with droppable 
+                        data-container={"canvas"} // indicates how the canvas should handle dragging, one is sidebar other is canvas
                     >
 
                     {this.renderContent()}
@@ -565,6 +572,7 @@ class Widget extends React.Component {
 
                     </div>
                 </div>
+            </WidgetDraggable>
         )
 
     }

src/canvas/widgets/draggableWidgetContext.js

@@ -0,0 +1,24 @@
+import React, { createContext, useContext, useState } from 'react';
+
+const DragWidgetContext = createContext()
+
+export const useDragWidgetContext = () => useContext(DragWidgetContext)
+
+// Provider component to wrap around parts of your app that need drag-and-drop functionality
+export const DragWidgetProvider = ({ children }) => {
+    const [draggedElement, setDraggedElement] = useState(null)
+
+    const onDragStart = (element) => {
+        setDraggedElement(element)
+    }
+
+    const onDragEnd = () => {
+        setDraggedElement(null)
+    }
+
+    return (
+        <DragWidgetContext.Provider value={{ draggedElement, onDragStart, onDragEnd }}>
+            {children}
+        </DragWidgetContext.Provider>
+    )
+}

src/canvas/widgets/widgetDragDrop.js

@@ -0,0 +1,127 @@
+import { memo, useState } from "react"
+import { useDragWidgetContext } from "./draggableWidgetContext"
+import { useDragContext } from "../../components/draggable/draggableContext"
+
+
+const WidgetDraggable = memo(({ widgetRef, dragElementType="widget", onDrop, droppableTags = ["widget"], ...props }) => {
+
+
+    // const { draggedElement, onDragStart, onDragEnd } = useDragWidgetContext()
+    const { draggedElement, onDragStart, onDragEnd } = useDragContext()
+
+    const [isDragging, setIsDragging] = useState(false)
+
+    const [showDroppable, setShowDroppable] = useState({
+        show: false,
+        allow: false
+    })
+
+    const handleDragStart = (e) => {
+        setIsDragging(true)
+
+        console.log("Draggable widget ref: ", widgetRef)
+        onDragStart(widgetRef?.current || null)
+
+        // Create custom drag image with full opacity, this will ensure the image isn't taken from part of the canvas
+        const dragImage = widgetRef?.current.cloneNode(true)
+        dragImage.style.opacity = '1' // Ensure full opacity
+        dragImage.style.position = 'absolute'
+        dragImage.style.top = '-9999px' // Move it out of view
+
+        document.body.appendChild(dragImage)
+        const rect = widgetRef?.current.getBoundingClientRect()
+        const offsetX = e.clientX - rect.left
+        const offsetY = e.clientY - rect.top
+
+        // Set the custom drag image with correct offset to avoid snapping to the top-left corner
+        e.dataTransfer.setDragImage(dragImage, offsetX, offsetY)
+
+        // Remove the custom drag image after some time to avoid leaving it in the DOM
+        setTimeout(() => {
+            document.body.removeChild(dragImage)
+        }, 0)
+    }
+
+    const handleDragEnter = (e) => {
+
+        const dragEleType = draggedElement.getAttribute("data-draggable-type")
+
+        if (droppableTags.length === 0 || droppableTags.includes(dragEleType)) {
+            setShowDroppable({
+                allow: true,
+                show: true
+            })
+        } else {
+            setShowDroppable({
+                allow: false,
+                show: true
+            })
+        }
+    }
+
+    const handleDragOver = (e) => {
+        // console.log("Drag over: ", e.dataTransfer.getData("text/plain"), e.dataTransfer)
+        const dragEleType = draggedElement.getAttribute("data-draggable-type")
+
+        if (droppableTags.length === 0 || droppableTags.includes(dragEleType)) {
+            e.preventDefault() // this is necessary to allow drop to take place
+        }
+
+    }
+
+    const handleDropEvent = (e) => {
+
+        setShowDroppable({
+            allow: false,
+            show: false
+        })
+
+        if (onDrop) {
+            onDrop(e, draggedElement)
+        }
+    }
+
+
+    const handleDragLeave = (e) => {
+        if (!e.currentTarget.contains(e.relatedTarget)) {
+            setShowDroppable({
+                allow: false,
+                show: false
+            })
+        }
+    }
+
+    const handleDragEnd = () => {
+        onDragEnd()
+        setIsDragging(false)
+    }
+
+    return (
+        <div className={`${props.className} tw-w-fit tw-h-fit`}
+            onDragOver={handleDragOver}
+            onDrop={handleDropEvent}
+            onDragEnter={handleDragEnter}
+            onDragLeave={handleDragLeave}
+
+            onDragStart={handleDragStart}
+            onDragEnd={handleDragEnd}
+            draggable
+            style={{ opacity: isDragging ? 0 : 1}} // hide the initial position when dragging
+        >
+            {
+                showDroppable.show &&
+                <div className={`${showDroppable.allow ? "tw-border-green-600" : "tw-border-red-600"} 
+                                    tw-absolute tw-top-0 tw-left-0 tw-w-full tw-h-full tw-z-[2]
+                                    tw-border-2 tw-border-dashed  tw-rounded-lg
+                                    `}>
+                </div>
+            }
+            {props.children}
+
+        </div>
+    )
+
+})
+
+
+export default WidgetDraggable