feat: handle diagonal submenu (aim)

Author: Akryum

packages/floating-vue/src/components/Popper.ts

@@ -388,6 +388,8 @@ export default () => ({
 
   methods: {
     show ({ event = null, skipDelay = false, force = false } = {}) {
+      if (this.parentPopper?.lockedChild && this.parentPopper.lockedChild !== this) return
+
       this.$_pendingHide = false
       if (force || !this.disabled) {
         this.$_scheduleShow(event, skipDelay)
@@ -404,10 +406,24 @@ export default () => ({
 
     hide ({ event = null, skipDelay = false } = {}) {
       if (this.$_hideInProgress) return
+
+      // Abort if child is shown
       if (this.shownChildren.size > 0) {
         this.$_pendingHide = true
         return
       }
+
+      // Abort if aiming for the popper
+      if (this.$_isAimingPopper()) {
+        if (this.parentPopper) {
+          this.parentPopper.lockedChild = this
+        }
+        return
+      }
+      if (this.parentPopper?.lockedChild === this) {
+        this.parentPopper.lockedChild = null
+      }
+
       this.$_pendingHide = false
       this.$_scheduleHide(event, skipDelay)
 
@@ -935,6 +951,28 @@ export default () => ({
         parent = parent.parentPopper
       }
     },
+
+    $_isAimingPopper () {
+      const referenceBounds: DOMRect = this.$el.getBoundingClientRect()
+      if (mouseX >= referenceBounds.left && mouseX <= referenceBounds.right && mouseY >= referenceBounds.top && mouseY <= referenceBounds.bottom) {
+        const popperBounds: DOMRect = this.$_popperNode.getBoundingClientRect()
+        const vectorX = mouseX - mousePreviousX
+        const vectorY = mouseY - mousePreviousY
+        const distance = (popperBounds.left + popperBounds.width / 2) - mousePreviousX + (popperBounds.top + popperBounds.height / 2) - mousePreviousY
+        // Make the vector long enough to be sure that it can intersect with the popper
+        const newVectorLength = distance + popperBounds.width + popperBounds.height
+        const edgeX = mousePreviousX + vectorX * newVectorLength
+        const edgeY = mousePreviousY + vectorY * newVectorLength
+        // Check for collision between the vector and the popper bounds
+        return (
+          lineIntersectsLine(mousePreviousX, mousePreviousY, edgeX, edgeY, popperBounds.left, popperBounds.top, popperBounds.left, popperBounds.bottom) || // Left edge
+          lineIntersectsLine(mousePreviousX, mousePreviousY, edgeX, edgeY, popperBounds.left, popperBounds.top, popperBounds.right, popperBounds.top) || // Top edge
+          lineIntersectsLine(mousePreviousX, mousePreviousY, edgeX, edgeY, popperBounds.right, popperBounds.top, popperBounds.right, popperBounds.bottom) || // Right edge
+          lineIntersectsLine(mousePreviousX, mousePreviousY, edgeX, edgeY, popperBounds.left, popperBounds.bottom, popperBounds.right, popperBounds.bottom) // Bottom edge
+        )
+      }
+      return false
+    },
   },
 
   render () {
@@ -1014,3 +1052,29 @@ export function hideAllPoppers () {
     popper.hide()
   }
 }
+
+// Track mouse movement to detect aiming at the popper
+
+let mousePreviousX = 0
+let mousePreviousY = 0
+let mouseX = 0
+let mouseY = 0
+
+if (typeof window !== 'undefined') {
+  window.addEventListener('mousemove', event => {
+    mousePreviousX = mouseX
+    mousePreviousY = mouseY
+    mouseX = event.clientX
+    mouseY = event.clientY
+  }, supportsPassive
+    ? {
+      passive: true,
+    }
+    : undefined)
+}
+
+function lineIntersectsLine (x1: number, y1: number, x2: number, y2: number, x3: number, y3: number, x4: number, y4: number) {
+  const uA = ((x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3)) / ((y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1))
+  const uB = ((x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3)) / ((y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1))
+  return (uA >= 0 && uA <= 1 && uB >= 0 && uB <= 1)
+}