Updating

dev/examples/Animation-display-visibility.tsx

@@ -0,0 +1,32 @@
+import { useState } from "react"
+import { MotionConfig, motion } from "framer-motion"
+
+/**
+ * An example of the tween transition type
+ */
+
+const style = {
+    width: 100,
+    height: 100,
+    background: "white",
+}
+
+export const App = () => {
+    const [state, setState] = useState(true)
+
+    return (
+        <MotionConfig transition={{ duration: 1 }}>
+            <motion.div
+                initial={{ display: "block" }}
+                animate={{
+                    display: state ? "block" : "none",
+                    visibility: state ? "visible" : "hidden",
+                    opacity: state ? 1 : 0.2,
+                }}
+                onUpdate={console.log}
+                style={style}
+            />
+            <button onClick={() => setState(!state)}>Toggle</button>
+        </MotionConfig>
+    )
+}

packages/framer-motion/src/animation/animators/utils/can-animate.ts

@@ -24,6 +24,9 @@ export function canAnimate(
     const originKeyframe = keyframes[0]
     if (originKeyframe === null) return false
 
+    console.log(keyframes, name)
+    if (name === "display" || name === "visibility") return true
+
     const targetKeyframe = keyframes[keyframes.length - 1]
     const isOriginAnimatable = isAnimatable(originKeyframe, name)
     const isTargetAnimatable = isAnimatable(targetKeyframe, name)

packages/framer-motion/src/motion/__tests__/animate-prop.test.tsx

@@ -6,7 +6,7 @@ import {
     useMotionValue,
     useMotionValueEvent,
 } from "../../"
-import { useRef, createRef } from "react";
+import { useRef, createRef } from "react"
 import { nextFrame } from "../../gestures/__tests__/utils"
 
 describe("animate prop as object", () => {
@@ -223,7 +223,7 @@ describe("animate prop as object", () => {
             const { container, rerender } = render(<Component />)
             rerender(<Component />)
         })
-        expect(promise).resolves.toHaveStyle(
+        return expect(promise).resolves.toHaveStyle(
             "transform: translateX(30px) translateX(30px) translateZ(0)"
         )
     })
@@ -242,8 +242,128 @@ describe("animate prop as object", () => {
             const { rerender } = render(<Component />)
             rerender(<Component />)
         })
-        expect(promise).resolves.toEqual(true)
+        return expect(promise).resolves.toEqual(true)
+    })
+
+    test("animate display none => block immediately switches to block", async () => {
+        const promise = new Promise((resolve) => {
+            const Component = () => {
+                const display = useMotionValue("block")
+                let hasChecked = false
+
+                return (
+                    <motion.div
+                        initial={{ display: "none", opacity: 0 }}
+                        animate={{ display: "block", opacity: 1 }}
+                        style={{ display }}
+                        transition={{ duration: 0.1 }}
+                        onUpdate={(latest) => {
+                            if (!hasChecked) {
+                                expect(latest.display).toBe("block")
+                                hasChecked = true
+                            }
+                        }}
+                        onAnimationComplete={() => {
+                            resolve([hasChecked, display.get()])
+                        }}
+                    />
+                )
+            }
+            const { rerender } = render(<Component />)
+            rerender(<Component />)
+        })
+        return expect(promise).resolves.toEqual([true, "block"])
+    })
+
+    test.only("animate display block => none switches to none on animation end", async () => {
+        const promise = new Promise((resolve) => {
+            let hasChecked = false
+            const Component = () => {
+                const display = useMotionValue("block")
+
+                return (
+                    <motion.div
+                        initial={{ display: "block", opacity: 1 }}
+                        animate={{ display: "none", opacity: 0 }}
+                        style={{ display }}
+                        transition={{ duration: 0.1 }}
+                        onUpdate={(latest) => {
+                            if (!hasChecked) {
+                                expect(latest.display).toBe("block")
+                                hasChecked = true
+                            }
+                        }}
+                        onAnimationComplete={() => {
+                            resolve([hasChecked, display.get()])
+                        }}
+                    />
+                )
+            }
+            render(<Component />)
+        })
+        return expect(promise).resolves.toEqual([true, "none"])
+    })
+
+    test("animate visibility hidden => visible immediately switches to visible", async () => {
+        const promise = new Promise((resolve) => {
+            const Component = () => {
+                const visibility = useMotionValue("visible")
+                let hasChecked = false
+
+                return (
+                    <motion.div
+                        initial={{ visibility: "hidden", opacity: 0 }}
+                        animate={{ visibility: "visible", opacity: 1 }}
+                        style={{ visibility }}
+                        transition={{ duration: 0.1 }}
+                        onUpdate={(latest) => {
+                            if (!hasChecked) {
+                                expect(latest.visibility).toBe("visible")
+                                hasChecked = true
+                            }
+                        }}
+                        onAnimationComplete={() => {
+                            resolve([hasChecked, visibility.get()])
+                        }}
+                    />
+                )
+            }
+            const { rerender } = render(<Component />)
+            rerender(<Component />)
+        })
+        return expect(promise).resolves.toEqual([true, "visible"])
+    })
+
+    test("animate visibility visible => hidden switches to hidden on animation end", async () => {
+        const promise = new Promise((resolve) => {
+            const Component = () => {
+                const visibility = useMotionValue("hidden")
+                let hasChecked = false
+
+                return (
+                    <motion.div
+                        initial={{ visibility: "visible", opacity: 1 }}
+                        animate={{ visibility: "hidden", opacity: 0 }}
+                        style={{ visibility }}
+                        transition={{ duration: 0.1 }}
+                        onUpdate={(latest) => {
+                            if (!hasChecked) {
+                                expect(latest.visibility).toBe("visible")
+                                hasChecked = true
+                            }
+                        }}
+                        onAnimationComplete={() => {
+                            resolve([hasChecked, visibility.get()])
+                        }}
+                    />
+                )
+            }
+            const { rerender } = render(<Component />)
+            rerender(<Component />)
+        })
+        return expect(promise).resolves.toEqual([true, "hidden"])
     })
+
     test("keyframes - accepts ease as an array", async () => {
         const promise = new Promise((resolve) => {
             const x = motionValue(0)

packages/framer-motion/src/render/html/utils/make-none-animatable.ts

@@ -1,3 +1,4 @@
+import { analyseComplexValue } from "../../../value/types/complex"
 import { getAnimatableNone } from "../../dom/value-types/animatable-none"
 import { UnresolvedKeyframes } from "../../utils/KeyframesResolver"
 
@@ -18,7 +19,11 @@ export function makeNoneKeyframesAnimatable(
     let animatableTemplate: string | undefined = undefined
     while (i < unresolvedKeyframes.length && !animatableTemplate) {
         const keyframe = unresolvedKeyframes[i]
-        if (typeof keyframe === "string" && !invalidTemplates.has(keyframe)) {
+        if (
+            typeof keyframe === "string" &&
+            !invalidTemplates.has(keyframe) &&
+            analyseComplexValue(keyframe).values.length
+        ) {
             animatableTemplate = unresolvedKeyframes[i] as string
         }
         i++

packages/framer-motion/src/utils/mix/__tests__/index.test.ts

@@ -37,4 +37,19 @@ describe("mix", () => {
             "var(--test-9) 35px"
         )
     })
+
+    test("mixes binary visibility", () => {
+        expect(mix("visible", "hidden")(0)).toBe("visible")
+        expect(mix("visible", "hidden")(0.5)).toBe("visible")
+        expect(mix("visible", "hidden")(1)).toBe("hidden")
+        expect(mix("hidden", "visible")(0)).toBe("hidden")
+        expect(mix("hidden", "visible")(0.5)).toBe("visible")
+        expect(mix("hidden", "visible")(1)).toBe("visible")
+        expect(mix("block", "none")(0)).toBe("block")
+        expect(mix("block", "none")(0.5)).toBe("block")
+        expect(mix("block", "none")(1)).toBe("none")
+        expect(mix("none", "block")(0)).toBe("none")
+        expect(mix("none", "block")(0.5)).toBe("block")
+        expect(mix("none", "block")(1)).toBe("block")
+    })
 })

packages/framer-motion/src/utils/mix/__tests__/mix-visibility.test.ts

@@ -0,0 +1,18 @@
+import { mixVisibility } from "../visibility"
+
+describe("mixVisibility", () => {
+    test("mixes binary visibility", () => {
+        expect(mixVisibility("visible", "hidden")(0)).toBe("visible")
+        expect(mixVisibility("visible", "hidden")(0.5)).toBe("visible")
+        expect(mixVisibility("visible", "hidden")(1)).toBe("hidden")
+        expect(mixVisibility("hidden", "visible")(0)).toBe("hidden")
+        expect(mixVisibility("hidden", "visible")(0.5)).toBe("visible")
+        expect(mixVisibility("hidden", "visible")(1)).toBe("visible")
+        expect(mixVisibility("block", "none")(0)).toBe("block")
+        expect(mixVisibility("block", "none")(0.5)).toBe("block")
+        expect(mixVisibility("block", "none")(1)).toBe("none")
+        expect(mixVisibility("none", "block")(0)).toBe("none")
+        expect(mixVisibility("none", "block")(0.5)).toBe("block")
+        expect(mixVisibility("none", "block")(1)).toBe("block")
+    })
+})

packages/framer-motion/src/utils/mix/complex.ts

@@ -11,6 +11,7 @@ import {
     complex,
 } from "../../value/types/complex"
 import { isCSSVariableToken } from "../../render/dom/utils/is-css-variable"
+import { invisibleValues, mixVisibility } from "./visibility"
 
 type MixableArray = Array<number | RGBA | HSLA | string>
 type MixableObject = {
@@ -112,6 +113,15 @@ export const mixComplex = (
         originStats.indexes.number.length >= targetStats.indexes.number.length
 
     if (canInterpolate) {
+        if (
+            (invisibleValues.has(origin as string) &&
+                !targetStats.values.length) ||
+            (invisibleValues.has(target as string) &&
+                !originStats.values.length)
+        ) {
+            return mixVisibility(origin as string, target as string)
+        }
+
         return pipe(
             mixArray(matchOrder(originStats, targetStats), targetStats.values),
             template

packages/framer-motion/src/utils/mix/visibility.ts

@@ -0,0 +1,14 @@
+export const invisibleValues = new Set(["none", "hidden"])
+
+/**
+ * Returns a function that, when provided a progress value between 0 and 1,
+ * will return the "none" or "hidden" string only when the progress is that of
+ * the origin or target.
+ */
+export function mixVisibility(origin: string, target: string) {
+    if (invisibleValues.has(origin)) {
+        return (p: number) => (p <= 0 ? origin : target)
+    } else {
+        return (p: number) => (p >= 1 ? target : origin)
+    }
+}