feat: Create an ErrorView that can be used to display errors

packages/code-studio/src/styleguide/ErrorViews.tsx

@@ -0,0 +1,59 @@
+/* eslint-disable react/jsx-props-no-spreading */
+/* eslint no-alert: "off" */
+import React, { CSSProperties } from 'react';
+import { ErrorView } from '@deephaven/components';
+import { sampleSectionIdAndClasses } from './utils';
+
+function ErrorViews(): React.ReactElement {
+  const columnStyle: CSSProperties = {
+    maxHeight: 500,
+    display: 'flex',
+    flexDirection: 'column',
+    maxWidth: 400,
+  };
+
+  const shortErrorMessage = 'This is a short error message';
+  const midErrorMessage = 'Mid length error message\n'.repeat(10);
+  const longErrorMessage = 'Really long error message\n'.repeat(100);
+
+  const midErrorType = 'MidError';
+  const longErrorType = 'SuperLongErrorMessageType';
+
+  return (
+    <div {...sampleSectionIdAndClasses('error-views')}>
+      <h2 className="ui-title" title="Display error messages easily">
+        Error Views
+      </h2>
+      <h3>Expandable</h3>
+      <div className="row" style={{ maxHeight: 500 }}>
+        <div className="col" style={columnStyle}>
+          <ErrorView message={shortErrorMessage} />
+        </div>
+        <div className="col" style={columnStyle}>
+          <ErrorView message={midErrorMessage} type={midErrorType} />
+        </div>
+        <div className="col" style={columnStyle}>
+          <ErrorView message={longErrorMessage} type={longErrorType} />
+        </div>
+      </div>
+      <h3>Always expanded</h3>
+      <div className="row" style={{ maxHeight: 500 }}>
+        <div className="col" style={columnStyle}>
+          <ErrorView message={shortErrorMessage} isExpanded />
+        </div>
+        <div className="col" style={columnStyle}>
+          <ErrorView message={midErrorMessage} type={midErrorType} isExpanded />
+        </div>
+        <div className="col" style={columnStyle}>
+          <ErrorView
+            message={longErrorMessage}
+            type={longErrorType}
+            isExpanded
+          />
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export default ErrorViews;

packages/code-studio/src/styleguide/StyleGuide.tsx

@@ -37,6 +37,7 @@ import { RandomAreaPlotAnimation } from './RandomAreaPlotAnimation';
 import SpectrumComparison from './SpectrumComparison';
 import Pickers from './Pickers';
 import ListViews from './ListViews';
+import ErrorViews from './ErrorViews';
 
 const stickyProps = {
   position: 'sticky',
@@ -133,6 +134,7 @@ function StyleGuide(): React.ReactElement {
 
         <SampleMenuCategory data-menu-category="Spectrum Comparison" />
         <SpectrumComparison />
+        <ErrorViews />
       </div>
     </div>
   );

packages/components/src/ErrorView.scss

@@ -0,0 +1,83 @@
+@import '../scss/custom.scss';
+
+.error-view {
+  position: relative;
+  color: $danger;
+  border-radius: $border-radius;
+  background-color: negative-opacity($exception-transparency);
+  display: flex;
+  flex-direction: column;
+  flex-grow: 0;
+  font-family: $font-family-monospace;
+  transition: all $transition ease-in-out;
+  max-height: 150px;
+
+  &.expanded {
+    max-height: 100%;
+  }
+
+  .error-view-header {
+    display: flex;
+    flex-direction: row;
+    justify-content: space-between;
+    text-wrap: nowrap;
+    width: 100%;
+
+    .error-view-header-text {
+      display: flex;
+      flex-direction: row;
+      align-items: center;
+      padding-left: $spacer;
+      padding-right: $spacer;
+      font-weight: bold;
+      flex-shrink: 1;
+      overflow: hidden;
+      white-space: nowrap;
+
+      span {
+        flex-shrink: 1;
+        overflow: hidden;
+        white-space: nowrap;
+        text-overflow: ellipsis;
+        padding-left: $spacer-1;
+      }
+    }
+
+    .error-view-buttons {
+      display: flex;
+      flex-direction: row;
+      gap: 1px;
+      overflow: hidden;
+      border-radius: 0 $border-radius 0 0;
+      flex-shrink: 0;
+
+      .btn-danger {
+        border-radius: 0;
+        color: var(--dh-color-contrast-dark);
+        opacity: 0.8;
+        padding: $spacer-1;
+        &:active {
+          color: var(--dh-color-contrast-dark);
+        }
+      }
+
+      .error-view-copy-button {
+        min-width: 3rem;
+      }
+    }
+  }
+
+  .error-view-text {
+    width: 100%;
+    padding: $spacer;
+    margin-bottom: 0;
+    color: $danger;
+    background-color: transparent;
+    border: 0;
+    resize: none;
+    outline: none;
+    white-space: pre;
+    flex-grow: 1;
+    overflow: auto;
+  }
+}

packages/components/src/ErrorView.tsx

@@ -0,0 +1,92 @@
+import React, { useCallback, useLayoutEffect, useRef, useState } from 'react';
+import classNames from 'classnames';
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
+import { vsDiffAdded, vsDiffRemoved, vsWarning } from '@deephaven/icons';
+import {
+  useDebouncedCallback,
+  useResizeObserver,
+} from '@deephaven/react-hooks';
+import CopyButton from './CopyButton';
+import Button from './Button';
+import './ErrorView.scss';
+
+export type ErrorViewerProps = {
+  /** The message to display in the error view */
+  message: string;
+
+  /** Set to true if you want the error view to display expanded. Will not show the Show More/Less buttons if true. Defaults to false. */
+  isExpanded?: boolean;
+
+  /** The type of error message to display in the header. Defaults to Error. */
+  type?: string;
+};
+
+/**
+ * Component that displays an error message in a textarea so user can scroll and a copy button.
+ */
+function ErrorView({
+  message,
+  isExpanded: isExpandedProp = false,
+  type = 'Error',
+}: ErrorViewerProps): JSX.Element {
+  const [isExpandable, setIsExpandable] = useState(false);
+  const [isExpanded, setIsExpanded] = useState(false);
+  const viewRef = useRef<HTMLDivElement>(null);
+  const textRef = useRef<HTMLPreElement>(null);
+
+  const handleResize = useCallback(() => {
+    if (isExpanded || isExpandedProp || textRef.current == null) {
+      return;
+    }
+    const newIsExpandable =
+      textRef.current.scrollHeight > textRef.current.clientHeight;
+    setIsExpandable(newIsExpandable);
+  }, [isExpanded, isExpandedProp]);
+
+  const debouncedHandleResize = useDebouncedCallback(handleResize, 100);
+
+  useResizeObserver(viewRef.current, debouncedHandleResize);
+
+  useLayoutEffect(debouncedHandleResize, [debouncedHandleResize]);
+
+  return (
+    <div
+      className={classNames('error-view', {
+        expanded: isExpanded || isExpandedProp,
+      })}
+      ref={viewRef}
+    >
+      <div className="error-view-header">
+        <div className="error-view-header-text">
+          <FontAwesomeIcon icon={vsWarning} />
+          <span>{type}</span>
+        </div>
+        <div className="error-view-buttons">
+          <CopyButton
+            kind="danger"
+            className="error-view-copy-button"
+            tooltip="Copy exception contents"
+            copy={`${type}: ${message}`.trim()}
+          />
+          {(isExpandable || isExpanded) && !isExpandedProp && (
+            <Button
+              kind="danger"
+              className="error-view-expand-button"
+              onClick={() => {
+                setIsExpanded(!isExpanded);
+              }}
+              icon={isExpanded ? vsDiffRemoved : vsDiffAdded}
+            >
+              {isExpanded ? 'Show Less' : 'Show More'}
+            </Button>
+          )}
+        </div>
+      </div>
+      <pre className="error-view-text" ref={textRef}>
+        {message}
+      </pre>
+    </div>
+  );
+}
+
+export default ErrorView;

packages/components/src/index.ts

@@ -23,6 +23,7 @@ export * from './DraggableItemList';
 export { default as DragUtils } from './DragUtils';
 export { default as EditableItemList } from './EditableItemList';
 export * from './ErrorBoundary';
+export { default as ErrorView } from './ErrorView';
 export { default as HierarchicalCheckboxMenu } from './HierarchicalCheckboxMenu';
 export * from './HierarchicalCheckboxMenu';
 export * from './ItemList';

tests/styleguide.spec.ts

@@ -45,6 +45,7 @@
   'sample-section-spectrum-forms',
   'sample-section-spectrum-overlays',
   'sample-section-spectrum-well',
+  'sample-section-error-views',
 ];
 const buttonSectionIds: string[] = [
   'sample-section-buttons-regular',
@@ -85,7 +86,7 @@
 
     const sampleSection = page.locator(`#${id}`);
 
     await expect(sampleSection).toHaveScreenshot(
       `${id.replace(/^sample-section-/, '')}.png`,
       { timeout: 45000 }
     );