improve code, add ignoreMutation option

packages/overlayscrollbars/src/observers/domObserver.ts

@@ -20,20 +20,23 @@ type DOMTargetObserverCallback = (targetChangedAttrs: string[], targetStyleChang
 interface DOMObserverOptionsBase {
   _attributes?: string[];
   _styleChangingAttributes?: string[];
+  /**
+   * A function which can ignore a changed attribute if it returns true.
+   * for DOMTargetObserver this applies to the changes to the observed target
+   * for DOMContentObserver this applies to changes to nested targets -> nested targets are elements which match the "_nestedTargetSelector" selector
+   */
+  _ignoreTargetChange?: DOMObserverIgnoreTargetChange;
 }
 
 interface DOMContentObserverOptions extends DOMObserverOptionsBase {
   _eventContentChange?: DOMObserverEventContentChange; // [selector, eventname(s) | function returning eventname(s)] -> eventnames divided by whitespaces
   _nestedTargetSelector?: string;
   _ignoreContentChange?: DOMObserverIgnoreContentChange; // function which will prevent marking certain dom changes as content change if it returns true
-  _ignoreNestedTargetChange?: DOMObserverIgnoreTargetChange; // a function which will prevent marking certain attributes as changed on nested targets if it returns true
 }
 
-interface DOMTargetObserverOptions extends DOMObserverOptionsBase {
-  _ignoreTargetChange?: DOMObserverIgnoreTargetChange; // a function which will prevent marking certain attributes as changed if it returns true
-}
+type DOMTargetObserverOptions = DOMObserverOptionsBase;
 
-type ContentChangeArrayItem = [string?, string?] | null | undefined;
+type ContentChangeArrayItem = [selector?: string, eventNames?: string] | null | undefined;
 
 export type DOMObserverEventContentChange =
   | Array<ContentChangeArrayItem>
@@ -161,7 +164,6 @@ export const createDOMObserver = <ContentObserver extends boolean>(
     _eventContentChange,
     _nestedTargetSelector,
     _ignoreTargetChange,
-    _ignoreNestedTargetChange,
     _ignoreContentChange,
   } = (options as DOMContentObserverOptions & DOMTargetObserverOptions) || {};
   const [destroyEventContentChange, updateEventContentChangeElements] = createEventContentChange(
@@ -182,8 +184,7 @@ export const createDOMObserver = <ContentObserver extends boolean>(
   const finalStyleChangingAttributes = _styleChangingAttributes || [];
   const observedAttributes = finalAttributes.concat(finalStyleChangingAttributes);
   const observerCallback = (mutations: MutationRecord[]) => {
-    const ignoreTargetChange =
-      (isContentObserver ? _ignoreNestedTargetChange : _ignoreTargetChange) || noop;
+    const ignoreTargetChange = _ignoreTargetChange || noop;
     const ignoreContentChange = _ignoreContentChange || noop;
     const targetChangedAttrs: string[] = [];
     const totalAddedNodes: Node[] = [];

packages/overlayscrollbars/src/options.ts

@@ -41,9 +41,10 @@ export type UpdatedCallback = (this: any, args?: UpdatedArgs) => void;
 export interface OSOptions {
   paddingAbsolute: boolean;
   updating: {
-    elementEvents: Array<[string, string]> | null;
+    elementEvents: Array<[elementSelector: string, eventNames: string]> | null;
     attributes: string[] | null;
-    debounce: number | [number, number] | null;
+    debounce: [timeout: number, maxWait: number] | number | null; // (if tuple: [timeout: 0, maxWait: 33], if number: [timeout: number, maxWait: false]) debounce for content Changes
+    ignoreMutation: ((mutation: MutationRecord) => any) | null;
   };
   overflow: {
     x: OverflowBehavior;
@@ -97,8 +98,9 @@ export const defaultOptions: OSOptions = {
   paddingAbsolute: false, // true || false
   updating: {
     elementEvents: [['img', 'load']], // array of tuples || null
-    attributes: null,
     debounce: [0, 33], // number || number array || null
+    attributes: null, // string array || null
+    ignoreMutation: null, // () => any || null
   },
   overflow: {
     x: 'scroll', // visible-hidden  || visible-scroll || hidden || scroll || v-h || v-s || h || s

packages/overlayscrollbars/src/overlayscrollbars.ts

@@ -62,6 +62,14 @@ export interface OverlayScrollbarsState {
   hasOverflow: XY<boolean>;
 }
 
+export interface OverlayScrollbarsElements {
+  target: HTMLElement;
+  host: HTMLElement;
+  padding: HTMLElement;
+  viewport: HTMLElement;
+  content: HTMLElement;
+}
+
 export interface OverlayScrollbars {
   options(): OSOptions;
   options(newOptions?: PartialOptions<OSOptions>): OSOptions;
@@ -70,6 +78,7 @@ export interface OverlayScrollbars {
   destroy(): void;
 
   state(): OverlayScrollbarsState;
+  elements(): OverlayScrollbarsElements;
 
   on: AddOSEventListener;
   off: RemoveOSEventListener;
@@ -177,7 +186,7 @@ export const OverlayScrollbars: OverlayScrollbarsStatic = (
     },
     on: addEvent,
     off: removeEvent,
-    state: () => {
+    state() {
       const { _overflowAmount, _overflowStyle, _hasOverflow, _padding, _paddingAbsolute } =
         structureState();
       return assignDeep(
@@ -191,6 +200,19 @@ export const OverlayScrollbars: OverlayScrollbarsStatic = (
         }
       );
     },
+    elements() {
+      const { _target, _host, _padding, _viewport, _content } = structureState._elements;
+      return assignDeep(
+        {},
+        {
+          target: _target,
+          host: _host,
+          padding: _padding || _viewport,
+          viewport: _viewport,
+          content: _content || _viewport,
+        }
+      );
+    },
     update(force?: boolean) {
       update({}, force);
     },

packages/overlayscrollbars/src/plugins/optionsValidation/optionsValidation.ts

@@ -25,6 +25,7 @@ const optionsTemplate: OptionsTemplate<OSOptions> = {
     elementEvents: arrayNullValues, // array of tuples || null
     attributes: arrayNullValues,
     debounce: [oTypes.number, oTypes.array, oTypes.null], // number || number array || null
+    ignoreMutation: [oTypes.function, oTypes.null], // function || null
   },
   overflow: {
     x: overflowAllowedValues, // visible-hidden  || visible-scroll || hidden || scrol

packages/overlayscrollbars/src/plugins/optionsValidation/validation.ts

@@ -3,7 +3,7 @@ import { type, isArray, isUndefined, isPlainObject, isString } from 'support/uti
 import { PlainObject, PartialOptions } from 'typings';
 
 export type OptionsObjectType = Record<string, unknown>;
-export type OptionsFunctionType = (this: unknown, ...args: unknown[]) => unknown;
+export type OptionsFunctionType = (this: any, ...args: any[]) => any;
 export type OptionsTemplateType<T extends OptionsTemplateNativeTypes> = ExtractPropsKey<
   OptionsTemplateTypeMap,
   T

packages/overlayscrollbars/src/setups/structureSetup/structureSetup.observers.ts

@@ -1,5 +1,4 @@
 import {
-  diffClass,
   debounce,
   isArray,
   isNumber,
@@ -19,14 +18,10 @@ import {
   removeClass,
   addClass,
   hasClass,
+  isFunction,
 } from 'support';
 import { getEnvironment } from 'environment';
-import {
-  dataAttributeHost,
-  classNameViewport,
-  classNameContent,
-  classNameOverflowVisible,
-} from 'classnames';
+import { dataAttributeHost, classNameViewport, classNameOverflowVisible } from 'classnames';
 import { createSizeObserver, SizeObserverCallbackParams } from 'observers/sizeObserver';
 import { createTrinsicObserver } from 'observers/trinsicObserver';
 import { createDOMObserver, DOMObserver } from 'observers/domObserver';
@@ -54,29 +49,12 @@ type ExcludeFromTuple<T extends readonly any[], E> = T extends [infer F, ...infe
 const hostSelector = `[${dataAttributeHost}]`;
 
 // TODO: observer textarea attrs if textarea
-// TODO: test _ignoreContentChange & _ignoreNestedTargetChange for content dom observer
-// TODO: test _ignoreTargetChange for target dom observer
 
 const viewportSelector = `.${classNameViewport}`;
-const contentSelector = `.${classNameContent}`;
-const ignorePrefix = 'os-';
 const viewportAttrsFromTarget = ['tabindex'];
 const baseStyleChangingAttrsTextarea = ['wrap', 'cols', 'rows'];
 const baseStyleChangingAttrs = ['id', 'class', 'style', 'open'];
 
-const ignoreTargetChange = (
-  target: Node,
-  attrName: string,
-  oldValue: string | null,
-  newValue: string | null
-) => {
-  if (attrName === 'class' && oldValue && newValue) {
-    const diff = diffClass(oldValue, newValue);
-    return !!diff.find((addedOrRemovedClass) => addedOrRemovedClass.indexOf(ignorePrefix) !== 0);
-  }
-  return false;
-};
-
 export const createStructureSetupObservers = (
   structureSetupElements: StructureSetupElementsObj,
   state: SetupState<StructureSetupState>,
@@ -198,21 +176,23 @@ export const createStructureSetupObservers = (
   const [destroyHostMutationObserver] = createDOMObserver(_host, false, onHostMutation, {
     _styleChangingAttributes: baseStyleChangingAttrs,
     _attributes: baseStyleChangingAttrs.concat(viewportAttrsFromTarget),
-    _ignoreTargetChange: ignoreTargetChange,
   });
 
   updateViewportAttrsFromHost();
 
   return [
     (checkOption) => {
+      const [ignoreMutation] = checkOption<string[] | null>('updating.ignoreMutation');
+      const [attributes, attributesChanged] = checkOption<string[] | null>('updating.attributes');
       const [elementEvents, elementEventsChanged] = checkOption<Array<[string, string]> | null>(
         'updating.elementEvents'
       );
-      const [attributes, attributesChanged] = checkOption<string[] | null>('updating.attributes');
       const [debounceValue, debounceChanged] = checkOption<Array<number> | number | null>(
         'updating.debounce'
       );
       const updateContentMutationObserver = elementEventsChanged || attributesChanged;
+      const ignoreMutationFromOptions = (mutation: MutationRecord) =>
+        isFunction(ignoreMutation) && ignoreMutation(mutation);
 
       if (updateContentMutationObserver) {
         if (contentMutationObserver) {
@@ -227,17 +207,14 @@ export const createStructureSetupObservers = (
             _styleChangingAttributes: contentMutationObserverAttr.concat(attributes || []),
             _attributes: contentMutationObserverAttr.concat(attributes || []),
             _eventContentChange: elementEvents,
-            _ignoreNestedTargetChange: ignoreTargetChange,
             _nestedTargetSelector: hostSelector,
             _ignoreContentChange: (mutation, isNestedTarget) => {
               const { target, attributeName } = mutation;
-              return !isNestedTarget && attributeName
-                ? liesBetween(
-                    target as Element,
-                    hostSelector,
-                    _content ? contentSelector : viewportSelector
-                  )
-                : false;
+              const ignore =
+                !isNestedTarget && attributeName
+                  ? liesBetween(target as Element, hostSelector, viewportSelector)
+                  : false;
+              return ignore || !!ignoreMutationFromOptions(mutation);
             },
           }
         );

packages/overlayscrollbars/tests/playwright/observers/domObserver/index.browser.ts

@@ -137,12 +137,6 @@ const targetDomObserver = createDOMObserver(
       should.ok(false, 'A target dom observer must not call the _ignoreContentChange method.');
       return true;
     },
-    // @ts-ignore
-    _ignoreNestedTargetChange: () => {
-      // if param: isContentObserver = false, this function should never be called.
-      should.ok(false, 'A target dom observer must not call the _ignoreNestedTargetChange method.');
-      return true;
-    },
   }
 );
 
@@ -182,7 +176,7 @@ const createContentDomOserver = (
           ? liesBetween(target as Element, hostSelector, '.content')
           : false;
       },
-      _ignoreNestedTargetChange: (_target, attrName, oldValue, newValue) => {
+      _ignoreTargetChange: (_target, attrName, oldValue, newValue) => {
         if (attrName === 'class' && oldValue && newValue) {
           const diff = diffClass(oldValue, newValue);
           const ignore = diff.length === 1 && diff[0].startsWith(ignorePrefix);
@@ -190,12 +184,6 @@ const createContentDomOserver = (
         }
         return false;
       },
-      // @ts-ignore
-      _ignoreTargetChange: () => {
-        // if param: isContentObserver = true, this function should never be called.
-        should.ok(false, 'A content dom observer must not call the _ignoreTargetChange method.');
-        return true;
-      },
     }
   );
 
@@ -503,7 +491,8 @@ const addRemoveImgElmsFn = async (changeless = false) => {
   const addChanged = async (
     newEventContentChange: Array<[string?, string?] | null | undefined>
   ) => {
-    contentDomObserver._destroy();
+    const [destroyA] = contentDomObserver;
+    destroyA();
     contentDomObserver = createContentDomOserver(newEventContentChange);
 
     const img = new Image(1, 1);
@@ -523,7 +512,8 @@ const addRemoveImgElmsFn = async (changeless = false) => {
       compare(1);
     });
 
-    contentDomObserver._destroy();
+    const [destroyB] = contentDomObserver;
+    destroyB();
     contentDomObserver = createContentDomOserver(contentChange);
   };
 
@@ -604,7 +594,8 @@ const addRemoveTransitionElmsFn = async () => {
     });
 
     await startTransition(elm, expectTransitionEndContentChange && true);
-    contentDomObserver._destroy();
+    const [destroy] = contentDomObserver;
+    destroy();
     contentDomObserver = createContentDomOserver(contentChange);
     await startTransition(elm, expectTransitionEndContentChange && false);
 
@@ -615,7 +606,8 @@ const addRemoveTransitionElmsFn = async () => {
 
   await add(false);
 
-  contentDomObserver._destroy();
+  const [destroy] = contentDomObserver;
+  destroy();
   contentDomObserver = createContentDomOserver(
     contentChange.concat([['.transition', 'transitionend']])
   );
@@ -734,15 +726,17 @@ const start = async () => {
 
   await addRemoveImgElmsFn();
 
-  targetDomObserver._update();
-  targetDomObserver._destroy();
-  targetDomObserver._destroy();
-  targetDomObserver._update();
+  const [destroyTarget, updateTarget] = targetDomObserver;
+  updateTarget();
+  destroyTarget();
+  destroyTarget();
+  updateTarget();
 
-  contentDomObserver._update();
-  contentDomObserver._destroy();
-  contentDomObserver._destroy();
-  contentDomObserver._update();
+  const [destroyContent, updateContent] = contentDomObserver;
+  updateContent();
+  destroyContent();
+  destroyContent();
+  updateContent();
 
   await addRemoveImgElmsFn(true); // won't trigger changes after destroy
 

packages/overlayscrollbars/tests/playwright/setups/structureSetup/nesting/index.browser.ts

@@ -5,7 +5,7 @@ import { OverlayScrollbars } from 'overlayscrollbars';
 import { resize } from '@/testing-browser/Resize';
 import { timeout } from '@/testing-browser/timeout';
 import { setTestResult, waitForOrFailTest } from '@/testing-browser/TestResult';
-import { addClass, removeAttr, style } from 'support';
+import { addClass, each, isArray, removeAttr, style } from 'support';
 
 OverlayScrollbars.env().setDefaultOptions({
   nativeScrollbarsOverlaid: { initialize: true },
@@ -28,14 +28,16 @@ const resizeBetweenB: HTMLElement | null = document.createElement('div');
 let rootUpdateCount = 0;
 let aUpdateCount = 0;
 let bUpdateCount = 0;
-OverlayScrollbars(
-  targetRoot!,
+const rootInstance = OverlayScrollbars(
+  { target: targetRoot!, padding: true },
   {},
   {
     initialized() {
-      addClass(targetRoot!.querySelector('.os-viewport'), 'flex');
-      addClass(resizeBetweenRoot, 'resize resizeBetween');
-      targetRoot!.append(resizeBetweenRoot);
+      requestAnimationFrame(() => {
+        addClass(rootInstance.elements().content, 'flex');
+        addClass(resizeBetweenRoot, 'resize resizeBetween');
+        targetRoot!.append(resizeBetweenRoot);
+      });
     },
     updated() {
       rootUpdateCount++;
@@ -47,17 +49,18 @@ OverlayScrollbars(
     },
   }
 );
-OverlayScrollbars(
+const aInstance = OverlayScrollbars(
   { target: targetA!, content: true },
   {},
   {
     initialized() {
-      addClass(targetA!.querySelector('.os-content'), 'flex');
-      addClass(resizeBetweenA, 'resize resizeBetween');
-      targetA!.append(resizeBetweenA);
+      requestAnimationFrame(() => {
+        addClass(aInstance.elements().content, 'flex');
+        addClass(resizeBetweenA, 'resize resizeBetween');
+        targetA!.append(resizeBetweenA);
+      });
     },
-    updated(args) {
-      console.log(args);
+    updated() {
       aUpdateCount++;
       requestAnimationFrame(() => {
         if (updatesASlot) {
@@ -67,7 +70,7 @@ OverlayScrollbars(
     },
   }
 );
-OverlayScrollbars(
+const bInstance = OverlayScrollbars(
   targetB!,
   {},
   {
@@ -131,7 +134,26 @@ const resizeResize = async (resizeElm: HTMLElement) => {
   removeAttr(resizeElm, 'style');
 };
 
+const overwriteScrollHeight = (elm: HTMLElement | HTMLElement[]) => {
+  const elements = isArray(elm) ? elm : [elm];
+
+  each(elements, (currElm) => {
+    Object.defineProperty(currElm, 'scrollHeight', {
+      configurable: true,
+      get() {
+        setTestResult(false);
+        throw new Error('accessed scrollHeight');
+      },
+    });
+  });
+};
+
 const testBetweenElements = async () => {
+  overwriteScrollHeight([
+    rootInstance.elements().viewport,
+    aInstance.elements().viewport,
+    bInstance.elements().viewport,
+  ]);
   await waitForOrFailTest(async () => {
     await resizeBetween(resizeBetweenRoot);
     await resizeBetween(resizeBetweenA);
@@ -150,8 +172,8 @@ const testResizeElements = async () => {
 const start = async () => {
   setTestResult(null);
 
-  await testBetweenElements();
   await testResizeElements();
+  await testBetweenElements(); // has to be last
 
   setTestResult(true);
 };

packages/overlayscrollbars/tests/playwright/setups/structureSetup/observers/index.browser.ts

@@ -0,0 +1,47 @@
+import './index.scss';
+import 'styles/overlayscrollbars.scss';
+import should from 'should';
+import { OverlayScrollbars } from 'overlayscrollbars';
+import { resize } from '@/testing-browser/Resize';
+import { timeout } from '@/testing-browser/timeout';
+import { setTestResult, waitForOrFailTest } from '@/testing-browser/TestResult';
+import { addClass, each, isArray, removeAttr, style } from 'support';
+
+OverlayScrollbars.env().setDefaultOptions({
+  nativeScrollbarsOverlaid: { initialize: true },
+});
+
+const startBtn: HTMLButtonElement | null = document.querySelector('#start');
+const target: HTMLElement | null = document.querySelector('#target');
+const updatesSlot: HTMLElement | null = document.querySelector('#update');
+
+let updateCount = 0;
+
+const osInstance = OverlayScrollbars(
+  { target: target! },
+  {
+    updating: {
+      ignoreMutation(mutation) {
+        console.log(mutation);
+      },
+    },
+  },
+  {
+    updated() {
+      updateCount++;
+      requestAnimationFrame(() => {
+        if (updatesSlot) {
+          updatesSlot.textContent = `${updateCount}`;
+        }
+      });
+    },
+  }
+);
+
+const start = async () => {
+  setTestResult(null);
+
+  setTestResult(true);
+};
+
+startBtn?.addEventListener('click', start);

packages/overlayscrollbars/tests/playwright/setups/structureSetup/observers/index.html

@@ -0,0 +1,10 @@
+<div id="controls">
+  <button id="start">start</button>
+</div>
+<div id="stage">
+  <div>
+    <div id="target" class="container">
+      <span>Hello</span>
+    </div>
+  </div>
+</div>

packages/overlayscrollbars/tests/playwright/setups/structureSetup/observers/index.scss

@@ -0,0 +1,57 @@
+body {
+  display: flex;
+  flex-direction: column;
+  overflow: scroll;
+}
+#controls {
+  flex: none;
+}
+#stage {
+  flex: auto;
+  position: relative;
+
+  & > div {
+    position: absolute;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    left: 0;
+    background: lightgoldenrodyellow;
+  }
+}
+
+.container {
+  border: 1px solid red;
+  width: 60%;
+  height: 60%;
+  padding: 10px;
+  margin: 10px;
+}
+
+.resize {
+  overflow: hidden;
+  background: lime;
+  border: 1px solid green;
+  padding: 10px;
+}
+
+.resizer {
+  position: relative;
+}
+
+.resizeBetween {
+  background: tomato;
+  position: absolute;
+  bottom: 0;
+  left: 0;
+}
+
+.resizeBtn {
+  position: absolute;
+  bottom: 0;
+  right: 0;
+  height: 20px;
+  width: 20px;
+  background: blue;
+  opacity: 0.3;
+}

packages/overlayscrollbars/tests/playwright/setups/structureSetup/observers/index.test.ts

@@ -0,0 +1,12 @@
+// @ts-ignore
+import { playwrightRollup, expectSuccess } from '@/playwright/rollup';
+import { test } from '@playwright/test';
+
+playwrightRollup();
+
+test.describe('StructureSetup.elements', () => {
+  test('nesting updates', async ({ page }) => {
+    await page.click('#start');
+    await expectSuccess(page);
+  });
+});

packages/overlayscrollbars/tests/playwright/setups/structureSetup/update/index.browser.ts

@@ -202,7 +202,7 @@ const metricsDimensionsEqual = (a: Metrics, b: Metrics) => {
   return JSON.stringify(aDimensions) === JSON.stringify(bDimensions);
 };
 
-target!.querySelector('.os-viewport')?.addEventListener('scroll', (e) => {
+osInstance.elements().viewport.addEventListener('scroll', (e) => {
   const viewport: HTMLElement | null = e.currentTarget as HTMLElement;
   comparison!.scrollLeft = viewport.scrollLeft;
   comparison!.scrollTop = viewport.scrollTop;
@@ -265,15 +265,13 @@ const checkMetrics = async (checkComparison: CheckComparisonObj) => {
   await waitForOrFailTest(async () => {
     const comparisonMetrics = getMetrics(comparison!);
     const targetMetrics = getMetrics(target!);
-    const targetViewport = target!.querySelector<HTMLElement>('.os-viewport');
-    const targetPadding = target!.querySelector<HTMLElement>('.os-padding');
+    const targetViewport = osInstance.elements().viewport;
+    const targetPadding = osInstance.elements().padding;
     const { x: overflowOptionX, y: overflowOptionY } = osInstance.options().overflow;
     const overflowOptionXVisible = isVisibleOverflow(overflowOptionX);
     const overflowOptionYVisible = isVisibleOverflow(overflowOptionY);
     const hostOverflowStyle = style(target, 'overflow');
-    const paddingOverflowStyle = targetPadding
-      ? style(targetPadding, 'overflow')
-      : hostOverflowStyle;
+    const paddingOverflowStyle = style(targetPadding, 'overflow');
     const viewportOverflowXStyle = style(targetViewport!, 'overflowX');
     const viewportOverflowYStyle = style(targetViewport!, 'overflowY');