create Truncate component

client/src/components/util/truncate.js

@@ -0,0 +1,59 @@
+import React, { Component } from "react";
+import { Tooltip, Position } from "@blueprintjs/core";
+import pixelWidth from "string-pixel-width";
+
+import { widthsMap, tooltipHoverOpenDelayQuick } from "../../globals";
+
+export default class Truncate extends Component {
+  maybeTruncateString = (str, maxSize, activeFont, fontSize) => {
+    let truncatedString = null;
+    const renderedSize = pixelWidth(str, {
+      font: activeFont,
+      size: fontSize,
+      map: widthsMap,
+    });
+    if (renderedSize > maxSize) {
+      const percentage = renderedSize / maxSize;
+      const newLength = str.length / percentage;
+      truncatedString = `${str.slice(0, newLength / 2)}…${str.slice(
+        -newLength / 2
+      )}`;
+    }
+
+    return truncatedString;
+  };
+
+  render() {
+    const {
+      children,
+      size,
+      fontSize,
+      "data-testid": testID,
+      "data-testclass": testClass,
+      style,
+    } = this.props;
+    const truncatedString = this.maybeTruncateString(
+      children,
+      size,
+      "Roboto Condensed",
+      fontSize
+    );
+    return (
+      <Tooltip
+        content={children}
+        disabled={truncatedString === null}
+        hoverOpenDelay={tooltipHoverOpenDelayQuick}
+        position={Position.LEFT}
+        usePortal
+        modifiers={{
+          preventOverflow: { enabled: false },
+          hide: { enabled: false },
+        }}
+      >
+        <span data-testid={testID} data-testclass={testClass} style={style}>
+          {truncatedString || children}
+        </span>
+      </Tooltip>
+    );
+  }
+}