Add flip method to examples

site/content/examples/09-transitions/06-deferred-transitions/App.svelte

@@ -1,6 +1,7 @@
 <script>
 	import { quintOut } from 'svelte/easing';
 	import crossfade from './crossfade.js'; // TODO put this in svelte/transition!
+	import { flip } from './flip.js';
 
 	const { send, receive } = crossfade({
 		fallback(node, params) {
@@ -13,9 +14,9 @@
 				css: t => `
 							transform: ${transform} scale(${t});
 							opacity: ${t}
-				`
+						`,
 			};
-		}
+		},
 	});
 
 	let todos = [
@@ -33,7 +34,7 @@
 		const todo = {
 			id: uid++,
 			done: false,
-			description: input.value
+			description: input.value,
 		};
 
 		todos = [todo, ...todos];
@@ -57,7 +58,8 @@
 		margin: 0 auto;
 	}
 
-	.left, .right {
+	.left,
+	.right {
 		float: left;
 		width: 50%;
 		padding: 0 1em 0 0;
@@ -83,7 +85,9 @@
 		user-select: none;
 	}
 
-	input { margin: 0 }
+	input {
+		margin: 0;
+	}
 
 	.right label {
 		background-color: rgb(180, 240, 100);
@@ -116,6 +120,7 @@
 			<label
 				in:receive="{{key: todo.id}}"
 				out:send="{{key: todo.id}}"
+				animate:flip
 			>
 				<input type=checkbox bind:checked={todo.done}>
 				{todo.description}
@@ -130,6 +135,7 @@
 			<label
 				in:receive="{{key: todo.id}}"
 				out:send="{{key: todo.id}}"
+				animate:flip
 			>
 				<input type=checkbox bind:checked={todo.done}>
 				{todo.description}

site/content/examples/09-transitions/06-deferred-transitions/flip.js

@@ -0,0 +1,24 @@
+import { cubicOut } from 'svelte/easing';
+
+ export function flip(node, animation, params) {
+	const style = getComputedStyle(node);
+	const transform = style.transform === 'none' ? '' : style.transform;
+
+ 	const dx = animation.from.left - animation.to.left;
+	const dy = animation.from.top - animation.to.top;
+
+ 	const d = Math.sqrt(dx * dx + dy * dy);
+
+ 	const {
+		delay = 0,
+		duration = d => Math.sqrt(d) * 120,
+		easing = cubicOut
+	} = params;
+
+ 	return {
+		delay,
+		duration: typeof duration === 'function' ? duration(d) : duration,
+		easing,
+		css: (t, u) => `transform: ${transform} translate(${u * dx}px, ${u * dy}px);`
+	};
+}

site/content/examples/10-animations/00-animate/App.svelte

@@ -1,6 +1,7 @@
 <script>
 	import { quintOut } from 'svelte/easing';
 	import crossfade from './crossfade.js'; // TODO put this in svelte/transition!
+	import { flip } from './flip.js';
 
 	const { send, receive } = crossfade({
 		fallback(node, params) {
@@ -13,9 +14,9 @@
 				css: t => `
 							transform: ${transform} scale(${t});
 							opacity: ${t}
-				`
+						`,
 			};
-		}
+		},
 	});
 
 	let todos = [
@@ -33,7 +34,7 @@
 		const todo = {
 			id: uid++,
 			done: false,
-			description: input.value
+			description: input.value,
 		};
 
 		todos = [todo, ...todos];
@@ -63,7 +64,8 @@
 		margin: 0 auto;
 	}
 
-	.left, .right {
+	.left,
+	.right {
 		float: left;
 		width: 50%;
 		padding: 0 1em 0 0;
@@ -89,7 +91,9 @@
 		user-select: none;
 	}
 
-	input { margin: 0 }
+	input {
+		margin: 0;
+	}
 
 	.right label {
 		background-color: rgb(180, 240, 100);
@@ -122,6 +126,7 @@
 			<label
 				in:receive="{{key: todo.id}}"
 				out:send="{{key: todo.id}}"
+				animate:flip
 			>
 				<input type=checkbox bind:checked={todo.done}>
 				{todo.description}
@@ -136,6 +141,7 @@
 			<label
 				in:receive="{{key: todo.id}}"
 				out:send="{{key: todo.id}}"
+				animate:flip
 			>
 				<input type=checkbox bind:checked={todo.done}>
 				{todo.description}

site/content/examples/10-animations/00-animate/flip.js

@@ -0,0 +1,24 @@
+import { cubicOut } from 'svelte/easing';
+
+ export function flip(node, animation, params) {
+	const style = getComputedStyle(node);
+	const transform = style.transform === 'none' ? '' : style.transform;
+
+ 	const dx = animation.from.left - animation.to.left;
+	const dy = animation.from.top - animation.to.top;
+
+ 	const d = Math.sqrt(dx * dx + dy * dy);
+
+ 	const {
+		delay = 0,
+		duration = d => Math.sqrt(d) * 120,
+		easing = cubicOut
+	} = params;
+
+ 	return {
+		delay,
+		duration: typeof duration === 'function' ? duration(d) : duration,
+		easing,
+		css: (t, u) => `transform: ${transform} translate(${u * dx}px, ${u * dy}px);`
+	};
+}