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node_modules/vant/es/picker/PickerColumn.mjs

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+import { ref, computed, watchEffect, defineComponent, createVNode as _createVNode } from "vue";
+import { clamp, numericProp, makeArrayProp, preventDefault, createNamespace, makeRequiredProp } from "../utils/index.mjs";
+import { getElementTranslateY, findIndexOfEnabledOption } from "./utils.mjs";
+import { useEventListener, useParent } from "@vant/use";
+import { useTouch } from "../composables/use-touch.mjs";
+import { useExpose } from "../composables/use-expose.mjs";
+const DEFAULT_DURATION = 200;
+const MOMENTUM_TIME = 300;
+const MOMENTUM_DISTANCE = 15;
+const [name, bem] = createNamespace("picker-column");
+const PICKER_KEY = Symbol(name);
+var stdin_default = defineComponent({
+  name,
+  props: {
+    value: numericProp,
+    fields: makeRequiredProp(Object),
+    options: makeArrayProp(),
+    readonly: Boolean,
+    allowHtml: Boolean,
+    optionHeight: makeRequiredProp(Number),
+    swipeDuration: makeRequiredProp(numericProp),
+    visibleOptionNum: makeRequiredProp(numericProp)
+  },
+  emits: ["change", "clickOption", "scrollInto"],
+  setup(props, {
+    emit,
+    slots
+  }) {
+    let moving;
+    let startOffset;
+    let touchStartTime;
+    let momentumOffset;
+    let transitionEndTrigger;
+    const root = ref();
+    const wrapper = ref();
+    const currentOffset = ref(0);
+    const currentDuration = ref(0);
+    const touch = useTouch();
+    const count = () => props.options.length;
+    const baseOffset = () => props.optionHeight * (+props.visibleOptionNum - 1) / 2;
+    const updateValueByIndex = (index) => {
+      let enabledIndex = findIndexOfEnabledOption(props.options, index);
+      const offset = -enabledIndex * props.optionHeight;
+      const trigger = () => {
+        if (enabledIndex > count() - 1) {
+          enabledIndex = findIndexOfEnabledOption(props.options, index);
+        }
+        const value = props.options[enabledIndex][props.fields.value];
+        if (value !== props.value) {
+          emit("change", value);
+        }
+      };
+      if (moving && offset !== currentOffset.value) {
+        transitionEndTrigger = trigger;
+      } else {
+        trigger();
+      }
+      currentOffset.value = offset;
+    };
+    const isReadonly = () => props.readonly || !props.options.length;
+    const onClickOption = (index) => {
+      if (moving || isReadonly()) {
+        return;
+      }
+      transitionEndTrigger = null;
+      currentDuration.value = DEFAULT_DURATION;
+      updateValueByIndex(index);
+      emit("clickOption", props.options[index]);
+    };
+    const getIndexByOffset = (offset) => clamp(Math.round(-offset / props.optionHeight), 0, count() - 1);
+    const currentIndex = computed(() => getIndexByOffset(currentOffset.value));
+    const momentum = (distance, duration) => {
+      const speed = Math.abs(distance / duration);
+      distance = currentOffset.value + speed / 3e-3 * (distance < 0 ? -1 : 1);
+      const index = getIndexByOffset(distance);
+      currentDuration.value = +props.swipeDuration;
+      updateValueByIndex(index);
+    };
+    const stopMomentum = () => {
+      moving = false;
+      currentDuration.value = 0;
+      if (transitionEndTrigger) {
+        transitionEndTrigger();
+        transitionEndTrigger = null;
+      }
+    };
+    const onTouchStart = (event) => {
+      if (isReadonly()) {
+        return;
+      }
+      touch.start(event);
+      if (moving) {
+        const translateY = getElementTranslateY(wrapper.value);
+        currentOffset.value = Math.min(0, translateY - baseOffset());
+      }
+      currentDuration.value = 0;
+      startOffset = currentOffset.value;
+      touchStartTime = Date.now();
+      momentumOffset = startOffset;
+      transitionEndTrigger = null;
+    };
+    const onTouchMove = (event) => {
+      if (isReadonly()) {
+        return;
+      }
+      touch.move(event);
+      if (touch.isVertical()) {
+        moving = true;
+        preventDefault(event, true);
+      }
+      const newOffset = clamp(startOffset + touch.deltaY.value, -(count() * props.optionHeight), props.optionHeight);
+      const newIndex = getIndexByOffset(newOffset);
+      if (newIndex !== currentIndex.value) {
+        emit("scrollInto", props.options[newIndex]);
+      }
+      currentOffset.value = newOffset;
+      const now = Date.now();
+      if (now - touchStartTime > MOMENTUM_TIME) {
+        touchStartTime = now;
+        momentumOffset = newOffset;
+      }
+    };
+    const onTouchEnd = () => {
+      if (isReadonly()) {
+        return;
+      }
+      const distance = currentOffset.value - momentumOffset;
+      const duration = Date.now() - touchStartTime;
+      const startMomentum = duration < MOMENTUM_TIME && Math.abs(distance) > MOMENTUM_DISTANCE;
+      if (startMomentum) {
+        momentum(distance, duration);
+        return;
+      }
+      const index = getIndexByOffset(currentOffset.value);
+      currentDuration.value = DEFAULT_DURATION;
+      updateValueByIndex(index);
+      setTimeout(() => {
+        moving = false;
+      }, 0);
+    };
+    const renderOptions = () => {
+      const optionStyle = {
+        height: `${props.optionHeight}px`
+      };
+      return props.options.map((option, index) => {
+        const text = option[props.fields.text];
+        const {
+          disabled
+        } = option;
+        const value = option[props.fields.value];
+        const data = {
+          role: "button",
+          style: optionStyle,
+          tabindex: disabled ? -1 : 0,
+          class: [bem("item", {
+            disabled,
+            selected: value === props.value
+          }), option.className],
+          onClick: () => onClickOption(index)
+        };
+        const childData = {
+          class: "van-ellipsis",
+          [props.allowHtml ? "innerHTML" : "textContent"]: text
+        };
+        return _createVNode("li", data, [slots.option ? slots.option(option, index) : _createVNode("div", childData, null)]);
+      });
+    };
+    useParent(PICKER_KEY);
+    useExpose({
+      stopMomentum
+    });
+    watchEffect(() => {
+      const index = moving ? Math.floor(-currentOffset.value / props.optionHeight) : props.options.findIndex((option) => option[props.fields.value] === props.value);
+      const enabledIndex = findIndexOfEnabledOption(props.options, index);
+      const offset = -enabledIndex * props.optionHeight;
+      if (moving && enabledIndex < index) stopMomentum();
+      currentOffset.value = offset;
+    });
+    useEventListener("touchmove", onTouchMove, {
+      target: root
+    });
+    return () => _createVNode("div", {
+      "ref": root,
+      "class": bem(),
+      "onTouchstartPassive": onTouchStart,
+      "onTouchend": onTouchEnd,
+      "onTouchcancel": onTouchEnd
+    }, [_createVNode("ul", {
+      "ref": wrapper,
+      "style": {
+        transform: `translate3d(0, ${currentOffset.value + baseOffset()}px, 0)`,
+        transitionDuration: `${currentDuration.value}ms`,
+        transitionProperty: currentDuration.value ? "all" : "none"
+      },
+      "class": bem("wrapper"),
+      "onTransitionend": stopMomentum
+    }, [renderOptions()])]);
+  }
+});
+export {
+  PICKER_KEY,
+  stdin_default as default
+};