From 2e6dbca06dc38576308297d0ba6331ec4274e8fe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E5=98=89=E6=B6=B5?= <chenjiahan@youzan.com>
Date: Tue, 14 Jan 2020 17:20:15 +0800
Subject: [PATCH] Revert "chore: remove hooks ooops!"

This reverts commit 8d4d965a85275373375bcd04563ec854c66d2f08.
---
 src/hooks/use-click-outside.ts | 21 ++++++++++++
 src/hooks/use-global-event.ts  | 46 +++++++++++++++++++++++++
 src/hooks/use-lock-scroll.ts   | 55 +++++++++++++++++++++++++++++
 src/hooks/use-touch.ts         | 63 ++++++++++++++++++++++++++++++++++
 4 files changed, 185 insertions(+)
 create mode 100644 src/hooks/use-click-outside.ts
 create mode 100644 src/hooks/use-global-event.ts
 create mode 100644 src/hooks/use-lock-scroll.ts
 create mode 100644 src/hooks/use-touch.ts

diff --git a/src/hooks/use-click-outside.ts b/src/hooks/use-click-outside.ts
new file mode 100644
index 000000000..db64eb2a0
--- /dev/null
+++ b/src/hooks/use-click-outside.ts
@@ -0,0 +1,21 @@
+import { Ref } from 'vue';
+import { useGlobalEvent } from './use-global-event';
+
+export type UseClickOutsideOpitons = {
+  event: string;
+  callback: EventListener;
+  element: Ref<Element>;
+  flag?: Ref<boolean>;
+};
+
+export function useClickOutside(options: UseClickOutsideOpitons) {
+  const { event = 'click', callback, element, flag } = options;
+
+  function onClick(event: Event) {
+    if (!element.value.contains(event.target as Node)) {
+      callback(event);
+    }
+  }
+
+  useGlobalEvent(document, event, onClick, false, flag);
+}
diff --git a/src/hooks/use-global-event.ts b/src/hooks/use-global-event.ts
new file mode 100644
index 000000000..319c043bf
--- /dev/null
+++ b/src/hooks/use-global-event.ts
@@ -0,0 +1,46 @@
+import { on, off } from '../utils/dom/event';
+import {
+  Ref,
+  watch,
+  onMounted,
+  onActivated,
+  onUnmounted,
+  onDeactivated
+} from 'vue';
+
+export function useGlobalEvent(
+  target: EventTarget,
+  event: string,
+  handler: EventListener,
+  passive = false,
+  flag?: Ref<boolean>
+) {
+  let binded: boolean;
+
+  function add() {
+    if (binded || (flag && !flag.value)) {
+      return;
+    }
+
+    on(target, event, handler, passive);
+    binded = true;
+  }
+
+  function remove() {
+    if (binded) {
+      off(target, event, handler);
+      binded = false;
+    }
+  }
+
+  if (flag) {
+    watch(() => {
+      flag.value ? add() : remove();
+    });
+  }
+
+  onMounted(add);
+  onActivated(add);
+  onUnmounted(remove);
+  onDeactivated(remove);
+}
diff --git a/src/hooks/use-lock-scroll.ts b/src/hooks/use-lock-scroll.ts
new file mode 100644
index 000000000..9783b2090
--- /dev/null
+++ b/src/hooks/use-lock-scroll.ts
@@ -0,0 +1,55 @@
+import { useTouch } from './use-touch';
+import { getScroller } from '../utils/dom/scroll';
+import { on, off, preventDefault } from '../utils/dom/event';
+
+let count = 0;
+const CLASSNAME = 'van-overflow-hidden';
+
+export function useLockScroll(element: HTMLElement) {
+  const { start, move, deltaY, direction } = useTouch();
+
+  function onTouchMove(event: TouchEvent) {
+    move(event);
+
+    if (direction.value !== 'vertical') {
+      return;
+    }
+
+    let prevent = false;
+    const up = deltaY.value < 0;
+    const scroller = getScroller(event.target as HTMLElement, element);
+    const { scrollTop, scrollHeight, offsetHeight } = scroller as HTMLElement;
+
+    if (scrollTop === 0) {
+      prevent = up && offsetHeight < scrollHeight;
+    } else if (scrollTop + offsetHeight >= scrollHeight) {
+      prevent = !up;
+    }
+
+    if (prevent) {
+      preventDefault(event, true);
+    }
+  }
+
+  function lock() {
+    if (!count) {
+      document.body.classList.add(CLASSNAME);
+    }
+
+    count++;
+    on(document, 'touchstart', start);
+    on(document, 'touchmove', onTouchMove);
+  }
+
+  lock();
+
+  return function unlock() {
+    count--;
+    off(document, 'touchstart', start);
+    off(document, 'touchmove', onTouchMove);
+
+    if (!count) {
+      document.body.classList.remove(CLASSNAME);
+    }
+  };
+}
diff --git a/src/hooks/use-touch.ts b/src/hooks/use-touch.ts
new file mode 100644
index 000000000..aaaa5fb5c
--- /dev/null
+++ b/src/hooks/use-touch.ts
@@ -0,0 +1,63 @@
+import { ref } from 'vue';
+
+const MIN_DISTANCE = 10;
+
+function getDirection(x: number, y: number) {
+  if (x > y && x > MIN_DISTANCE) {
+    return 'horizontal';
+  }
+
+  if (y > x && y > MIN_DISTANCE) {
+    return 'vertical';
+  }
+
+  return '';
+}
+
+export function useTouch() {
+  const startX = ref(0);
+  const startY = ref(0);
+  const deltaX = ref(0);
+  const deltaY = ref(0);
+  const offsetX = ref(0);
+  const offsetY = ref(0);
+  const direction = ref('');
+
+  function reset() {
+    direction.value = '';
+    deltaX.value = 0;
+    deltaY.value = 0;
+    offsetX.value = 0;
+    offsetY.value = 0;
+  }
+
+  function start(event: TouchEvent) {
+    reset();
+    startX.value = event.touches[0].clientX;
+    startY.value = event.touches[0].clientY;
+  }
+
+  function move(event: TouchEvent) {
+    const touch = event.touches[0];
+    deltaX.value = touch.clientX - this.startX;
+    deltaY.value = touch.clientY - this.startY;
+    offsetX.value = Math.abs(this.deltaX);
+    offsetY.value = Math.abs(this.deltaY);
+
+    if (!direction.value) {
+      direction.value = getDirection(offsetX.value, offsetY.value);
+    }
+  }
+
+  return {
+    move,
+    start,
+    startX,
+    startY,
+    deltaX,
+    deltaY,
+    offsetX,
+    offsetY,
+    direction
+  };
+}