From a998500839fba3d6932b28235e83c086de7811c3 Mon Sep 17 00:00:00 2001
From: hide_d <hided62@gmail.com>
Date: Sun, 26 Dec 2021 22:32:04 +0900
Subject: [PATCH] =?UTF-8?q?feat:=20DragSelect=20=EC=B6=94=EA=B0=80=20-=20V?=
 =?UTF-8?q?ue2=20=EB=B2=84=EC=A0=84=EC=9D=84=20Vue3=EB=A1=9C=20=EC=9D=B4?=
 =?UTF-8?q?=EC=8B=9D?=
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---
 hwe/ts/components/DragSelect.vue | 186 +++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 hwe/ts/components/DragSelect.vue

diff --git a/hwe/ts/components/DragSelect.vue b/hwe/ts/components/DragSelect.vue
new file mode 100644
index 00000000..ed954947
--- /dev/null
+++ b/hwe/ts/components/DragSelect.vue
@@ -0,0 +1,186 @@
+<template>
+  <div
+    ref="container"
+    style="
+      position: relative;
+      user-select: none;
+      overflow: hidden;
+      touch-action: none;
+    "
+  >
+    <slot :selected="intersected" />
+  </div>
+</template>
+
+<script lang="ts">
+/// https://github.com/andi23rosca/drag-select-vue/blob/master/src/DragSelect.vue
+import { defineComponent, ref, watch, onMounted, onBeforeUnmount, PropType } from "vue";
+import VueTypes from "vue-types";
+
+function getDimensions(p1: coord, p2: coord): rect {
+  return {
+    width: Math.abs(p1.x - p2.x),
+    height: Math.abs(p1.y - p2.y),
+  };
+}
+function collisionCheck(node1: DOMRect, node2: DOMRect): boolean {
+  return (
+    node1.left < node2.left + node2.width &&
+    node1.left + node1.width > node2.left &&
+    node1.top < node2.top + node2.height &&
+    node1.top + node1.height > node2.top
+  );
+}
+
+type coord = { x: number; y: number };
+type rect = { width: number; height: number };
+
+export default defineComponent({
+  props: {
+    attribute: VueTypes.string.isRequired,
+    color: {
+      ...VueTypes.string.def("#4299E1"),
+      required: false,
+    },
+    opacity: {
+      ...VueTypes.number.def(0.7),
+      required: false,
+    },
+    modelValue: {
+        type: Object as PropType<Set<string>>,
+        required: false,
+        default: ()=>new Set(),
+    }
+  },
+  emits: ["update:modelValue", "dragDone"],
+  setup(props, { emit }) {
+    const intersected = ref<Set<string>>(props.modelValue);
+    const container = ref<HTMLElement>();
+
+    watch(intersected, (val) => {
+      emit("update:modelValue", val);
+    });
+    watch(props.modelValue, (val)=>{
+        if(intersected.value === val){
+            return;
+        }
+        intersected.value = val;
+    });
+
+    onMounted(() => {
+      if (!container.value) {
+        console.error(`Container is not referenced.`);
+        return;
+      }
+      const uContainer = container.value;
+      let containerRect = uContainer.getBoundingClientRect();
+
+      function getCoords(e: MouseEvent | Touch): coord {
+        return {
+          x: e.clientX - containerRect.left,
+          y: e.clientY - containerRect.top,
+        };
+      }
+      let children: HTMLCollection;
+      let box = document.createElement("div");
+      box.setAttribute("data-drag-box-component", "");
+      box.style.position = "absolute";
+      box.style.backgroundColor = props.color;
+      box.style.opacity = `${props.opacity}`;
+      let start = { x: 0, y: 0 };
+      let end = { x: 0, y: 0 };
+      function intersection() {
+        const rect = box.getBoundingClientRect();
+        const localIntersected = new Set<string>();
+        for (let i = 0; i < children.length; i++) {
+          if (collisionCheck(rect, children[i].getBoundingClientRect())) {
+            const attr = children[i].getAttribute(props.attribute);
+            if (children[i].hasAttribute(props.attribute)) {
+              localIntersected.add(attr as string);
+            }
+          }
+        }
+
+        let dismatch = false;
+        for(const oldVal of intersected.value){
+            if(!localIntersected.has(oldVal)){
+                dismatch = true;
+                break;
+            }
+        }
+        if(!dismatch){
+            for(const newVal of localIntersected){
+                if(!intersected.value.has(newVal)){
+                    dismatch = true;
+                    break;
+                }
+            }
+        }
+        if(dismatch){
+            intersected.value = localIntersected;
+        }
+      }
+      function touchStart(e: TouchEvent) {
+        e.preventDefault();
+        startDrag(e.touches[0]);
+      }
+      function touchMove(e: TouchEvent) {
+        e.preventDefault();
+        drag(e.touches[0]);
+      }
+      function startDrag(e: MouseEvent | Touch) {
+        containerRect =uContainer.getBoundingClientRect();
+        children = uContainer.children;
+        start = getCoords(e);
+        end = start;
+        document.addEventListener("mousemove", drag);
+        document.addEventListener("touchmove", touchMove);
+        box.style.top = start.y + "px";
+        box.style.left = start.x + "px";
+        uContainer.prepend(box);
+        intersection();
+      }
+      function drag(e: MouseEvent | Touch) {
+        end = getCoords(e);
+        const dimensions = getDimensions(start, end);
+        if (end.x < start.x) {
+          box.style.left = end.x + "px";
+        }
+        if (end.y < start.y) {
+          box.style.top = end.y + "px";
+        }
+        box.style.width = dimensions.width + "px";
+        box.style.height = dimensions.height + "px";
+        intersection();
+      }
+      function endDrag() {
+        start = { x: 0, y: 0 };
+        end = { x: 0, y: 0 };
+        box.style.width = "0";
+        box.style.height = "0";
+        document.removeEventListener("mousemove", drag);
+        document.removeEventListener("touchmove", touchMove);
+        box.remove();
+        emit('dragDone', intersected.value);
+      }
+
+      uContainer.addEventListener("mousedown", startDrag);
+      uContainer.addEventListener("touchstart", touchStart);
+      document.addEventListener("mouseup", endDrag);
+      document.addEventListener("touchend", endDrag);
+
+      onBeforeUnmount(() => {
+        uContainer.removeEventListener("mousedown", startDrag);
+        uContainer.removeEventListener("touchstart", touchStart);
+        document.removeEventListener("mouseup", endDrag);
+        document.removeEventListener("touchend", endDrag);
+      });
+    });
+
+    return {
+      intersected,
+      container,
+    };
+  },
+});
+</script>
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