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<!--
SPDX-FileCopyrightText: syuilo and other misskey contributors
SPDX-License-Identifier: AGPL-3.0-only
-->
<template>
<div
ref="rootEl"
:class="[$style.transitionRoot]"
@touchstart.passive="touchStart"
@touchmove.passive="touchMove"
@touchend.passive="touchEnd"
>
<Transition
:class="[$style.transitionChildren, { [$style.swiping]: isSwipingForClass }]"
:enterActiveClass="$style.swipeAnimation_enterActive"
:leaveActiveClass="$style.swipeAnimation_leaveActive"
:enterFromClass="transitionName === 'swipeAnimationLeft' ? $style.swipeAnimationLeft_enterFrom : $style.swipeAnimationRight_enterFrom"
:leaveToClass="transitionName === 'swipeAnimationLeft' ? $style.swipeAnimationLeft_leaveTo : $style.swipeAnimationRight_leaveTo"
:style="`--swipe: ${pullDistance}px;`"
>
<!-- 【注意】slot内の最上位要素に動的にkeyを設定すること -->
<!-- 各最上位要素にユニークなkeyの指定がないとTransitionがうまく動きません -->
<slot></slot>
</Transition>
</div>
</template>
<script lang="ts" setup>
import { ref, shallowRef, computed, nextTick, watch } from 'vue';
import type { Tab } from '@/components/global/MkPageHeader.tabs.vue';
import { defaultStore } from '@/store.js';
const rootEl = shallowRef<HTMLDivElement>();
// eslint-disable-next-line no-undef
const tabModel = defineModel<string>('tab');
const props = defineProps<{
tabs: Tab[];
}>();
const emit = defineEmits<{
(ev: 'swiped', newKey: string, direction: 'left' | 'right'): void;
}>();
// ▼ しきい値 ▼ //
// スワイプと判定される最小の距離
const MIN_SWIPE_DISTANCE = 50;
// スワイプ時の動作を発火する最小の距離
const SWIPE_DISTANCE_THRESHOLD = 125;
// スワイプを中断するY方向の移動距離
const SWIPE_ABORT_Y_THRESHOLD = 75;
// スワイプできる最大の距離
const MAX_SWIPE_DISTANCE = 150;
// ▲ しきい値 ▲ //
let startScreenX: number | null = null;
let startScreenY: number | null = null;
const currentTabIndex = computed(() => props.tabs.findIndex(tab => tab.key === tabModel.value));
const pullDistance = ref(0);
const isSwiping = ref(false);
const isSwipingForClass = ref(false);
let swipeAborted = false;
function touchStart(event: TouchEvent) {
if (!defaultStore.reactiveState.enableHorizontalSwipe.value) return;
if (event.touches.length !== 1) return;
startScreenX = event.touches[0].screenX;
startScreenY = event.touches[0].screenY;
}
function touchMove(event: TouchEvent) {
if (!defaultStore.reactiveState.enableHorizontalSwipe.value) return;
if (event.touches.length !== 1) return;
if (startScreenX == null || startScreenY == null) return;
if (swipeAborted) return;
let distanceX = event.touches[0].screenX - startScreenX;
let distanceY = event.touches[0].screenY - startScreenY;
if (Math.abs(distanceY) > SWIPE_ABORT_Y_THRESHOLD) {
swipeAborted = true;
pullDistance.value = 0;
isSwiping.value = false;
setTimeout(() => {
isSwipingForClass.value = false;
}, 400);
return;
}
if (Math.abs(distanceX) < MIN_SWIPE_DISTANCE) return;
if (Math.abs(distanceX) > MAX_SWIPE_DISTANCE) return;
if (currentTabIndex.value === 0 || props.tabs[currentTabIndex.value - 1].onClick) {
distanceX = Math.min(distanceX, 0);
}
if (currentTabIndex.value === props.tabs.length - 1 || props.tabs[currentTabIndex.value + 1].onClick) {
distanceX = Math.max(distanceX, 0);
}
if (distanceX === 0) return;
isSwiping.value = true;
isSwipingForClass.value = true;
nextTick(() => {
// グリッチを控えるため、1.5px以上の差がないと更新しない
if (Math.abs(distanceX - pullDistance.value) < 1.5) return;
pullDistance.value = distanceX;
});
}
function touchEnd(event: TouchEvent) {
if (swipeAborted) {
swipeAborted = false;
return;
}
if (!defaultStore.reactiveState.enableHorizontalSwipe.value) return;
if (event.touches.length !== 0) return;
if (startScreenX == null) return;
if (!isSwiping.value) return;
const distance = event.changedTouches[0].screenX - startScreenX;
if (Math.abs(distance) > SWIPE_DISTANCE_THRESHOLD) {
if (distance > 0) {
if (props.tabs[currentTabIndex.value - 1] && !props.tabs[currentTabIndex.value - 1].onClick) {
tabModel.value = props.tabs[currentTabIndex.value - 1].key;
emit('swiped', props.tabs[currentTabIndex.value - 1].key, 'right');
}
} else {
if (props.tabs[currentTabIndex.value + 1] && !props.tabs[currentTabIndex.value + 1].onClick) {
tabModel.value = props.tabs[currentTabIndex.value + 1].key;
emit('swiped', props.tabs[currentTabIndex.value + 1].key, 'left');
}
}
}
pullDistance.value = 0;
isSwiping.value = false;
window.setTimeout(() => {
isSwipingForClass.value = false;
}, 400);
}
const transitionName = ref<'swipeAnimationLeft' | 'swipeAnimationRight' | undefined>(undefined);
watch(tabModel, (newTab, oldTab) => {
const newIndex = props.tabs.findIndex(tab => tab.key === newTab);
const oldIndex = props.tabs.findIndex(tab => tab.key === oldTab);
if (oldIndex >= 0 && newIndex && oldIndex < newIndex) {
transitionName.value = 'swipeAnimationLeft';
} else {
transitionName.value = 'swipeAnimationRight';
}
window.setTimeout(() => {
transitionName.value = undefined;
}, 400);
});
</script>
<style lang="scss" module>
.transitionRoot {
display: grid;
grid-template-columns: 100%;
overflow: clip;
}
.transitionChildren {
grid-area: 1 / 1 / 2 / 2;
transform: translateX(var(--swipe));
&.swipeAnimation_enterActive,
&.swipeAnimation_leaveActive {
transition: transform .3s cubic-bezier(0.65, 0.05, 0.36, 1);
}
&.swipeAnimationRight_leaveTo,
&.swipeAnimationLeft_enterFrom {
transform: translateX(calc(100% + 24px));
}
&.swipeAnimationRight_enterFrom,
&.swipeAnimationLeft_leaveTo {
transform: translateX(calc(-100% - 24px));
}
}
.swiping {
transition: transform .2s ease-out;
}
</style>
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