import { markRaw, defineComponent, ref, effectScope, computed, watch, nextTick, onMounted } from 'vue';
import { useEventListener } from '@vueuse/core';
import { ElIcon } from '../../icon/index.mjs';
import '../../../hooks/index.mjs';
import { EVENT_CODE } from '../../../utils/aria.mjs';
import { isFirefox, rafThrottle } from '../../../utils/util.mjs';
import { FullScreen, ScaleToOriginal, Close, ArrowLeft, ArrowRight, ZoomOut, ZoomIn, RefreshLeft, RefreshRight } from '@element-plus/icons-vue';
import { imageViewerProps, imageViewerEmits } from './image-viewer2.mjs';
import { useLocale } from '../../../hooks/use-locale/index.mjs';

const Mode = {
  CONTAIN: {
    name: "contain",
    icon: markRaw(FullScreen)
  },
  ORIGINAL: {
    name: "original",
    icon: markRaw(ScaleToOriginal)
  }
};
const mousewheelEventName = isFirefox() ? "DOMMouseScroll" : "mousewheel";
var script = defineComponent({
  name: "ElImageViewer",
  components: {
    ElIcon,
    Close,
    ArrowLeft,
    ArrowRight,
    ZoomOut,
    ZoomIn,
    RefreshLeft,
    RefreshRight
  },
  props: imageViewerProps,
  emits: imageViewerEmits,
  setup(props, { emit }) {
    const { t } = useLocale();
    const wrapper = ref();
    const img = ref();
    const scopeEventListener = effectScope();
    const loading = ref(true);
    const index = ref(props.initialIndex);
    const mode = ref(Mode.CONTAIN);
    const transform = ref({
      scale: 1,
      deg: 0,
      offsetX: 0,
      offsetY: 0,
      enableTransition: false
    });
    const isSingle = computed(() => {
      const { urlList } = props;
      return urlList.length <= 1;
    });
    const isFirst = computed(() => {
      return index.value === 0;
    });
    const isLast = computed(() => {
      return index.value === props.urlList.length - 1;
    });
    const currentImg = computed(() => {
      return props.urlList[index.value];
    });
    const imgStyle = computed(() => {
      const { scale, deg, offsetX, offsetY, enableTransition } = transform.value;
      const style = {
        transform: `scale(${scale}) rotate(${deg}deg)`,
        transition: enableTransition ? "transform .3s" : "",
        marginLeft: `${offsetX}px`,
        marginTop: `${offsetY}px`
      };
      if (mode.value.name === Mode.CONTAIN.name) {
        style.maxWidth = style.maxHeight = "100%";
      }
      return style;
    });
    function hide() {
      unregisterEventListener();
      emit("close");
    }
    function registerEventListener() {
      const keydownHandler = rafThrottle((e) => {
        switch (e.code) {
          case EVENT_CODE.esc:
            hide();
            break;
          case EVENT_CODE.space:
            toggleMode();
            break;
          case EVENT_CODE.left:
            prev();
            break;
          case EVENT_CODE.up:
            handleActions("zoomIn");
            break;
          case EVENT_CODE.right:
            next();
            break;
          case EVENT_CODE.down:
            handleActions("zoomOut");
            break;
        }
      });
      const mousewheelHandler = rafThrottle((e) => {
        const delta = e.wheelDelta ? e.wheelDelta : -e.detail;
        if (delta > 0) {
          handleActions("zoomIn", {
            zoomRate: 0.015,
            enableTransition: false
          });
        } else {
          handleActions("zoomOut", {
            zoomRate: 0.015,
            enableTransition: false
          });
        }
      });
      scopeEventListener.run(() => {
        useEventListener(document, "keydown", keydownHandler);
        useEventListener(document, mousewheelEventName, mousewheelHandler);
      });
    }
    function unregisterEventListener() {
      scopeEventListener.stop();
    }
    function handleImgLoad() {
      loading.value = false;
    }
    function handleImgError(e) {
      loading.value = false;
      e.target.alt = t("el.image.error");
    }
    function handleMouseDown(e) {
      if (loading.value || e.button !== 0 || !wrapper.value)
        return;
      const { offsetX, offsetY } = transform.value;
      const startX = e.pageX;
      const startY = e.pageY;
      const divLeft = wrapper.value.clientLeft;
      const divRight = wrapper.value.clientLeft + wrapper.value.clientWidth;
      const divTop = wrapper.value.clientTop;
      const divBottom = wrapper.value.clientTop + wrapper.value.clientHeight;
      const dragHandler = rafThrottle((ev) => {
        transform.value = {
          ...transform.value,
          offsetX: offsetX + ev.pageX - startX,
          offsetY: offsetY + ev.pageY - startY
        };
      });
      const removeMousemove = useEventListener(document, "mousemove", dragHandler);
      useEventListener(document, "mouseup", (evt) => {
        const mouseX = evt.pageX;
        const mouseY = evt.pageY;
        if (mouseX < divLeft || mouseX > divRight || mouseY < divTop || mouseY > divBottom) {
          reset();
        }
        removeMousemove();
      });
      e.preventDefault();
    }
    function reset() {
      transform.value = {
        scale: 1,
        deg: 0,
        offsetX: 0,
        offsetY: 0,
        enableTransition: false
      };
    }
    function toggleMode() {
      if (loading.value)
        return;
      const modeNames = Object.keys(Mode);
      const modeValues = Object.values(Mode);
      const currentMode = mode.value.name;
      const index2 = modeValues.findIndex((i) => i.name === currentMode);
      const nextIndex = (index2 + 1) % modeNames.length;
      mode.value = Mode[modeNames[nextIndex]];
      reset();
    }
    function prev() {
      if (isFirst.value && !props.infinite)
        return;
      const len = props.urlList.length;
      index.value = (index.value - 1 + len) % len;
    }
    function next() {
      if (isLast.value && !props.infinite)
        return;
      const len = props.urlList.length;
      index.value = (index.value + 1) % len;
    }
    function handleActions(action, options = {}) {
      if (loading.value)
        return;
      const { zoomRate, rotateDeg, enableTransition } = {
        zoomRate: 0.2,
        rotateDeg: 90,
        enableTransition: true,
        ...options
      };
      switch (action) {
        case "zoomOut":
          if (transform.value.scale > 0.2) {
            transform.value.scale = parseFloat((transform.value.scale - zoomRate).toFixed(3));
          }
          break;
        case "zoomIn":
          transform.value.scale = parseFloat((transform.value.scale + zoomRate).toFixed(3));
          break;
        case "clockwise":
          transform.value.deg += rotateDeg;
          break;
        case "anticlockwise":
          transform.value.deg -= rotateDeg;
          break;
      }
      transform.value.enableTransition = enableTransition;
    }
    watch(currentImg, () => {
      nextTick(() => {
        const $img = img.value;
        if (!($img == null ? void 0 : $img.complete)) {
          loading.value = true;
        }
      });
    });
    watch(index, (val) => {
      reset();
      emit("switch", val);
    });
    onMounted(() => {
      var _a, _b;
      registerEventListener();
      (_b = (_a = wrapper.value) == null ? void 0 : _a.focus) == null ? void 0 : _b.call(_a);
    });
    return {
      index,
      wrapper,
      img,
      isSingle,
      isFirst,
      isLast,
      currentImg,
      imgStyle,
      mode,
      handleActions,
      prev,
      next,
      hide,
      toggleMode,
      handleImgLoad,
      handleImgError,
      handleMouseDown
    };
  }
});

export { script as default };
//# sourceMappingURL=image-viewer.vue_vue_type_script_lang.mjs.map
