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node_modules/motion-dom/dist/es/view/start.mjs

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+import { secondsToMilliseconds } from 'motion-utils';
+import { GroupAnimation } from '../animation/GroupAnimation.mjs';
+import { NativeAnimation } from '../animation/NativeAnimation.mjs';
+import { NativeAnimationWrapper } from '../animation/NativeAnimationWrapper.mjs';
+import { getValueTransition } from '../animation/utils/get-value-transition.mjs';
+import { mapEasingToNativeEasing } from '../animation/waapi/easing/map-easing.mjs';
+import { applyGeneratorOptions } from '../animation/waapi/utils/apply-generator.mjs';
+import { chooseLayerType } from './utils/choose-layer-type.mjs';
+import { css } from './utils/css.mjs';
+import { getViewAnimationLayerInfo } from './utils/get-layer-info.mjs';
+import { getViewAnimations } from './utils/get-view-animations.mjs';
+import { hasTarget } from './utils/has-target.mjs';
+
+const definitionNames = ["layout", "enter", "exit", "new", "old"];
+function startViewAnimation(builder) {
+    const { update, targets, options: defaultOptions } = builder;
+    if (!document.startViewTransition) {
+        return new Promise(async (resolve) => {
+            await update();
+            resolve(new GroupAnimation([]));
+        });
+    }
+    // TODO: Go over existing targets and ensure they all have ids
+    /**
+     * If we don't have any animations defined for the root target,
+     * remove it from being captured.
+     */
+    if (!hasTarget("root", targets)) {
+        css.set(":root", {
+            "view-transition-name": "none",
+        });
+    }
+    /**
+     * Set the timing curve to linear for all view transition layers.
+     * This gets baked into the keyframes, which can't be changed
+     * without breaking the generated animation.
+     *
+     * This allows us to set easing via updateTiming - which can be changed.
+     */
+    css.set("::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*)", { "animation-timing-function": "linear !important" });
+    css.commit(); // Write
+    const transition = document.startViewTransition(async () => {
+        await update();
+        // TODO: Go over new targets and ensure they all have ids
+    });
+    transition.finished.finally(() => {
+        css.remove(); // Write
+    });
+    return new Promise((resolve) => {
+        transition.ready.then(() => {
+            const generatedViewAnimations = getViewAnimations();
+            const animations = [];
+            /**
+             * Create animations for each of our explicitly-defined subjects.
+             */
+            targets.forEach((definition, target) => {
+                // TODO: If target is not "root", resolve elements
+                // and iterate over each
+                for (const key of definitionNames) {
+                    if (!definition[key])
+                        continue;
+                    const { keyframes, options } = definition[key];
+                    for (let [valueName, valueKeyframes] of Object.entries(keyframes)) {
+                        if (!valueKeyframes)
+                            continue;
+                        const valueOptions = {
+                            ...getValueTransition(defaultOptions, valueName),
+                            ...getValueTransition(options, valueName),
+                        };
+                        const type = chooseLayerType(key);
+                        /**
+                         * If this is an opacity animation, and keyframes are not an array,
+                         * we need to convert them into an array and set an initial value.
+                         */
+                        if (valueName === "opacity" &&
+                            !Array.isArray(valueKeyframes)) {
+                            const initialValue = type === "new" ? 0 : 1;
+                            valueKeyframes = [initialValue, valueKeyframes];
+                        }
+                        /**
+                         * Resolve stagger function if provided.
+                         */
+                        if (typeof valueOptions.delay === "function") {
+                            valueOptions.delay = valueOptions.delay(0, 1);
+                        }
+                        valueOptions.duration && (valueOptions.duration = secondsToMilliseconds(valueOptions.duration));
+                        valueOptions.delay && (valueOptions.delay = secondsToMilliseconds(valueOptions.delay));
+                        const animation = new NativeAnimation({
+                            ...valueOptions,
+                            element: document.documentElement,
+                            name: valueName,
+                            pseudoElement: `::view-transition-${type}(${target})`,
+                            keyframes: valueKeyframes,
+                        });
+                        animations.push(animation);
+                    }
+                }
+            });
+            /**
+             * Handle browser generated animations
+             */
+            for (const animation of generatedViewAnimations) {
+                if (animation.playState === "finished")
+                    continue;
+                const { effect } = animation;
+                if (!effect || !(effect instanceof KeyframeEffect))
+                    continue;
+                const { pseudoElement } = effect;
+                if (!pseudoElement)
+                    continue;
+                const name = getViewAnimationLayerInfo(pseudoElement);
+                if (!name)
+                    continue;
+                const targetDefinition = targets.get(name.layer);
+                if (!targetDefinition) {
+                    /**
+                     * If transition name is group then update the timing of the animation
+                     * whereas if it's old or new then we could possibly replace it using
+                     * the above method.
+                     */
+                    const transitionName = name.type === "group" ? "layout" : "";
+                    let animationTransition = {
+                        ...getValueTransition(defaultOptions, transitionName),
+                    };
+                    animationTransition.duration && (animationTransition.duration = secondsToMilliseconds(animationTransition.duration));
+                    animationTransition =
+                        applyGeneratorOptions(animationTransition);
+                    const easing = mapEasingToNativeEasing(animationTransition.ease, animationTransition.duration);
+                    effect.updateTiming({
+                        delay: secondsToMilliseconds(animationTransition.delay ?? 0),
+                        duration: animationTransition.duration,
+                        easing,
+                    });
+                    animations.push(new NativeAnimationWrapper(animation));
+                }
+                else if (hasOpacity(targetDefinition, "enter") &&
+                    hasOpacity(targetDefinition, "exit") &&
+                    effect
+                        .getKeyframes()
+                        .some((keyframe) => keyframe.mixBlendMode)) {
+                    animations.push(new NativeAnimationWrapper(animation));
+                }
+                else {
+                    animation.cancel();
+                }
+            }
+            resolve(new GroupAnimation(animations));
+        });
+    });
+}
+function hasOpacity(target, key) {
+    return target?.[key]?.keyframes.opacity;
+}
+
+export { startViewAnimation };