GridCore: Refactoring of the fluent borders related code. (#26393)

packages/devextreme/js/__internal/grids/grid_core/m_modules.ts

@@ -5,7 +5,7 @@ import Callbacks from '@js/core/utils/callbacks';
 // @ts-expect-error
 import { grep } from '@js/core/utils/common';
 import { each } from '@js/core/utils/iterator';
-import { isDefined, isFunction } from '@js/core/utils/type';
+import { isFunction } from '@js/core/utils/type';
 import { hasWindow } from '@js/core/utils/window';
 import messageLocalization from '@js/localization/message';
 import errors from '@js/ui/widget/ui.errors';
@@ -16,11 +16,11 @@ import type {
   View as ViewType,
   ViewController as ViewControllerType,
 } from './m_types';
+import type { ViewsWithBorder } from './views/utils/update_views_borders';
+import { updateViewsBorders } from './views/utils/update_views_borders';
 
 const WIDGET_WITH_LEGACY_CONTAINER_NAME = 'dxDataGrid';
 
-const BORDERED_VIEWS = ['columnHeadersView', 'rowsView', 'footerView', 'filterPanelView'];
-
 const ModuleItem = Class.inherit({
   _endUpdateCore() { },
 
@@ -262,83 +262,13 @@ const View: ModuleType<ViewType> = ModuleItem.inherit({
     return this.component._views[name];
   },
 
-  getFirstVisibleViewElement() {
-    const columnHeaderView = this.getView('columnHeadersView');
-    if (columnHeaderView && columnHeaderView.isVisible()) {
-      return columnHeaderView.element();
-    }
-
-    return this.getView('rowsView').element();
-  },
-
-  getLastVisibleViewElement() {
-    const filterPanelView = this.getView('filterPanelView');
-    if (filterPanelView && filterPanelView.isVisible()) {
-      return filterPanelView.element();
-    }
-
-    const footerView = this.getView('footerView');
-    if (footerView && footerView.isVisible()) {
-      return footerView.element();
-    }
-
-    return this.getView('rowsView').element();
-  },
-
-  getViewElementWithClass(className) {
-    const borderedView = BORDERED_VIEWS.map((viewName) => this.getView(viewName))
-      .filter((view) => view && view.element())
-      .find((view) => view.element().hasClass(className));
-
-    return borderedView && borderedView.element();
-  },
-
-  updateBorderedViews() {
-    const BORDERED_TOP_VIEW_CLASS = 'dx-bordered-top-view';
-    const BORDERED_BOTTOM_VIEW_CLASS = 'dx-bordered-bottom-view';
-
-    const oldFirstBorderedElement = this.getViewElementWithClass(BORDERED_TOP_VIEW_CLASS);
-    const oldLastBorderedElement = this.getViewElementWithClass(BORDERED_BOTTOM_VIEW_CLASS);
-    const newFirstBorderedElement = this.getFirstVisibleViewElement();
-    const newLastBorderedElement = this.getLastVisibleViewElement();
-
-    if (oldFirstBorderedElement && !oldFirstBorderedElement.is(newFirstBorderedElement)) {
-      oldFirstBorderedElement.removeClass(BORDERED_TOP_VIEW_CLASS);
-    }
-
-    if (oldLastBorderedElement && !oldLastBorderedElement.is(newLastBorderedElement)) {
-      oldLastBorderedElement.removeClass(BORDERED_BOTTOM_VIEW_CLASS);
-    }
-
-    if (!newFirstBorderedElement.hasClass(BORDERED_TOP_VIEW_CLASS)) {
-      newFirstBorderedElement.addClass(BORDERED_TOP_VIEW_CLASS);
-    }
-
-    if (!newLastBorderedElement.hasClass(BORDERED_BOTTOM_VIEW_CLASS)) {
-      newLastBorderedElement.addClass(BORDERED_BOTTOM_VIEW_CLASS);
-    }
-  },
-
-  isViewsStateValid() {
-    if (this.component._views) {
-      if (!BORDERED_VIEWS.includes(this.name)) {
-        return false;
-      }
-
-      const rowsView = this.getView('rowsView');
-      if (!(rowsView && isDefined(rowsView.element?.()))) {
-        return false;
-      }
-
-      const optionalViews = ['columnHeadersView', 'footerView', 'filterPanelView']
-        .map((viewName) => this.getView(viewName))
-        .filter((view) => view && view.isVisible?.());
-      const isOptionalViewsRendered = optionalViews.every((view) => view && isDefined(view.element()));
-
-      return isOptionalViewsRendered;
-    }
-
-    return false;
+  _getBorderedViews(): ViewsWithBorder {
+    return {
+      columnHeadersView: this.component._views.columnHeadersView,
+      rowsView: this.component._views.rowsView,
+      filterPanelView: this.component._views.filterPanelView,
+      footerView: this.component._views.footerView,
+    };
   },
 
   render($parent, options) {
@@ -356,8 +286,8 @@ const View: ModuleType<ViewType> = ModuleItem.inherit({
 
     $element.toggleClass('dx-hidden', !isVisible);
 
-    if (this.isViewsStateValid()) {
-      this.updateBorderedViews();
+    if (this.component._views) {
+      updateViewsBorders(this.name, this._getBorderedViews());
     }
 
     if (isVisible) {

packages/devextreme/js/__internal/grids/grid_core/views/utils/update_views_borders.ts

@@ -0,0 +1,106 @@
+/* eslint-disable @typescript-eslint/no-unsafe-return */
+import { dxElementWrapper } from '@js/core/renderer';
+import { isDefined } from '@js/core/utils/type';
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type View = any;
+
+// TODO: Move to the grid_core/m_types views interface.
+export interface ViewsWithBorder {
+  columnHeadersView: View;
+  rowsView: View;
+  filterPanelView: View;
+  footerView: View;
+}
+
+const CLASSES = {
+  borderedTop: 'dx-bordered-top-view',
+  borderedBottom: 'dx-bordered-bottom-view',
+};
+
+const getFirstVisibleViewElement = ({
+  columnHeadersView,
+  rowsView,
+}: ViewsWithBorder): dxElementWrapper => {
+  if (columnHeadersView?.isVisible()) {
+    return columnHeadersView.element();
+  }
+
+  return rowsView.element();
+};
+
+const getLastVisibleViewElement = ({
+  filterPanelView,
+  footerView,
+  rowsView,
+}: ViewsWithBorder): dxElementWrapper => {
+  if (filterPanelView?.isVisible()) {
+    return filterPanelView.element();
+  }
+
+  if (footerView?.isVisible()) {
+    return footerView.element();
+  }
+
+  return rowsView.element();
+};
+
+const getViewElementWithClass = (
+  viewsWithBorder: ViewsWithBorder,
+  className: string,
+): dxElementWrapper | null => {
+  const borderedView = Object.values(viewsWithBorder)
+    .find((view) => view?.element()?.hasClass(className));
+
+  return borderedView?.element() ?? null;
+};
+
+const shouldUpdateBorders = (
+  viewName: string,
+  viewsWithBorder: ViewsWithBorder,
+): boolean => {
+  if (!Object.keys(viewsWithBorder).includes(viewName)) {
+    return false;
+  }
+
+  const { rowsView, ...otherViews } = viewsWithBorder;
+  if (!isDefined(rowsView?.element?.())) {
+    return false;
+  }
+
+  return Object.values(otherViews)
+    .filter((view) => view?.isVisible?.())
+    .every((view) => isDefined(view?.element()));
+};
+
+export const updateViewsBorders = (
+  viewName: string,
+  viewsWithBorder: ViewsWithBorder,
+): void => {
+  if (!shouldUpdateBorders(viewName, viewsWithBorder)) {
+    return;
+  }
+
+  const $oldFirst = getViewElementWithClass(viewsWithBorder, CLASSES.borderedTop);
+  const $oldLast = getViewElementWithClass(viewsWithBorder, CLASSES.borderedBottom);
+  const $newFirst = getFirstVisibleViewElement(viewsWithBorder);
+  const $newLast = getLastVisibleViewElement(viewsWithBorder);
+
+  // @ts-expect-error The dxElementWrapper's "is" method is badly typed.
+  if ($oldFirst && !$oldFirst.is($newFirst)) {
+    $oldFirst.removeClass(CLASSES.borderedTop);
+  }
+
+  // @ts-expect-error The dxElementWrapper's "is" method is badly typed.
+  if ($oldLast && !$oldLast.is($newLast)) {
+    $oldLast.removeClass(CLASSES.borderedBottom);
+  }
+
+  if (!$newFirst.hasClass(CLASSES.borderedTop)) {
+    $newFirst.addClass(CLASSES.borderedTop);
+  }
+
+  if (!$newLast.hasClass(CLASSES.borderedBottom)) {
+    $newLast.addClass(CLASSES.borderedBottom);
+  }
+};