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Diagram-Canvas/packages/popper.js.1.16.1/content/Scripts/src/modifiers/hide.js

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+import isModifierRequired from '../utils/isModifierRequired';
+import find from '../utils/find';
+
+/**
+ * @function
+ * @memberof Modifiers
+ * @argument {Object} data - The data object generated by update method
+ * @argument {Object} options - Modifiers configuration and options
+ * @returns {Object} The data object, properly modified
+ */
+export default function hide(data) {
+  if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {
+    return data;
+  }
+
+  const refRect = data.offsets.reference;
+  const bound = find(
+    data.instance.modifiers,
+    modifier => modifier.name === 'preventOverflow'
+  ).boundaries;
+
+  if (
+    refRect.bottom < bound.top ||
+    refRect.left > bound.right ||
+    refRect.top > bound.bottom ||
+    refRect.right < bound.left
+  ) {
+    // Avoid unnecessary DOM access if visibility hasn't changed
+    if (data.hide === true) {
+      return data;
+    }
+
+    data.hide = true;
+    data.attributes['x-out-of-boundaries'] = '';
+  } else {
+    // Avoid unnecessary DOM access if visibility hasn't changed
+    if (data.hide === false) {
+      return data;
+    }
+
+    data.hide = false;
+    data.attributes['x-out-of-boundaries'] = false;
+  }
+
+  return data;
+}