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packages/color-picker/src/draggable.js

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+import Vue from 'vue';
+let isDragging = false;
+
+export default function(element, options) {
+  if (Vue.prototype.$isServer) return;
+  const moveFn = function(event) {
+    if (options.drag) {
+      options.drag(event);
+    }
+  };
+  const upFn = function(event) {
+    document.removeEventListener('mousemove', moveFn);
+    document.removeEventListener('mouseup', upFn);
+    document.onselectstart = null;
+    document.ondragstart = null;
+
+    isDragging = false;
+
+    if (options.end) {
+      options.end(event);
+    }
+  };
+  element.addEventListener('mousedown', function(event) {
+    if (isDragging) return;
+    document.onselectstart = function() { return false; };
+    document.ondragstart = function() { return false; };
+
+    document.addEventListener('mousemove', moveFn);
+    document.addEventListener('mouseup', upFn);
+    isDragging = true;
+
+    if (options.start) {
+      options.start(event);
+    }
+  });
+}