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frontend/src/directives/modules/longpress.ts

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+/**
+ * v-longpress
+ * 长按指令，长按时触发事件
+ */
+import type { Directive, DirectiveBinding } from "vue";
+
+const directive: Directive = {
+  mounted(el: HTMLElement, binding: DirectiveBinding) {
+    if (typeof binding.value !== "function") {
+      throw "callback must be a function";
+    }
+    // 定义变量
+    let pressTimer: any = null;
+    // 创建计时器（ 2秒后执行函数 ）
+    const start = (e: any) => {
+      if (e.button) {
+        if (e.type === "click" && e.button !== 0) {
+          return;
+        }
+      }
+      if (pressTimer === null) {
+        pressTimer = setTimeout(() => {
+          handler(e);
+        }, 1000);
+      }
+    };
+    // 取消计时器
+    const cancel = () => {
+      if (pressTimer !== null) {
+        clearTimeout(pressTimer);
+        pressTimer = null;
+      }
+    };
+    // 运行函数
+    const handler = (e: MouseEvent | TouchEvent) => {
+      binding.value(e);
+    };
+    // 添加事件监听器
+    el.addEventListener("mousedown", start);
+    el.addEventListener("touchstart", start);
+    // 取消计时器
+    el.addEventListener("click", cancel);
+    el.addEventListener("mouseout", cancel);
+    el.addEventListener("touchend", cancel);
+    el.addEventListener("touchcancel", cancel);
+  }
+};
+
+export default directive;