text: /*
   * Copyright 2021 Palantir Technologies, Inc. All rights reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  import { __spreadArrays } from "tslib";
  import classNames from "classnames";
  import * as React from "react";
  import { CSSTransition, TransitionGroup } from "react-transition-group";
  import { Classes, DISPLAYNAME_PREFIX } from "../../common";
  import { PanelView2 } from "./panelView2";
  /**
   * @template T type union of all possible panels in this stack
   */
  // eslint-disable-next-line @typescript-eslint/ban-types
  export var PanelStack2 = function (props) {
      var _a = props.renderActivePanelOnly, renderActivePanelOnly = _a === void 0 ? true : _a, _b = props.showPanelHeader, showPanelHeader = _b === void 0 ? true : _b, propsStack = props.stack;
      var _c = React.useState("push"), direction = _c[0], setDirection = _c[1];
      var _d = React.useState(props.initialPanel !== undefined ? [props.initialPanel] : []), localStack = _d[0], setLocalStack = _d[1];
      var stack = React.useMemo(function () { return (propsStack != null ? propsStack.slice().reverse() : localStack); }, [
          localStack,
          propsStack,
      ]);
      var stackLength = React.useRef(stack.length);
      React.useEffect(function () {
          if (stack.length !== stackLength.current) {
              // Adjust the direction in case the stack size has changed, controlled or uncontrolled
              setDirection(stack.length - stackLength.current < 0 ? "pop" : "push");
          }
          stackLength.current = stack.length;
      }, [stack]);
      var handlePanelOpen = React.useCallback(function (panel) {
          var _a;
          (_a = props.onOpen) === null || _a === void 0 ? void 0 : _a.call(props, panel);
          if (props.stack == null) {
              setLocalStack(function (prevStack) { return __spreadArrays([panel], prevStack); });
          }
      }, [props.onOpen]);
      var handlePanelClose = React.useCallback(function (panel) {
          var _a;
          // only remove this panel if it is at the top and not the only one.
          if (stack[0] !== panel || stack.length <= 1) {
              return;
          }
          (_a = props.onClose) === null || _a === void 0 ? void 0 : _a.call(props, panel);
          if (props.stack == null) {
              setLocalStack(function (prevStack) { return prevStack.slice(1); });
          }
      }, [stack, props.onClose]);
      // early return, after all hooks are called
      if (stack.length === 0) {
          return null;
      }
      var panelsToRender = renderActivePanelOnly ? [stack[0]] : stack;
      var panels = panelsToRender
          .map(function (panel, index) {
          // With renderActivePanelOnly={false} we would keep all the CSSTransitions rendered,
          // therefore they would not trigger the "enter" transition event as they were entered.
          // To force the enter event, we want to change the key, but stack.length is not enough
          // and a single panel should not rerender as long as it's hidden.
          // This key contains two parts: first one, stack.length - index is constant (and unique) for each panel,
          // second one, active changes only when the panel becomes or stops being active.
          var layer = stack.length - index;
          var key = renderActivePanelOnly ? stack.length : layer;
          return (React.createElement(CSSTransition, { classNames: Classes.PANEL_STACK2, key: key, timeout: 400 },
              React.createElement(PanelView2, { onClose: handlePanelClose, onOpen: handlePanelOpen, panel: panel, previousPanel: stack[index + 1], showHeader: showPanelHeader })));
      })
          .reverse();
      var classes = classNames(Classes.PANEL_STACK2, Classes.PANEL_STACK2 + "-" + direction, props.className);
      return (React.createElement(TransitionGroup, { className: classes, component: "div" }, panels));
  };
  PanelStack2.displayName = DISPLAYNAME_PREFIX + ".PanelStack2";
  //# sourceMappingURL=panelStack2.js.map