1 files changed, 119 insertions, 0 deletions
diff --git a/packages/excalidraw/components/Tooltip.tsx b/packages/excalidraw/components/Tooltip.tsx
new file mode 100644
index 0000000..38c04ef
--- /dev/null
+++ b/packages/excalidraw/components/Tooltip.tsx
@@ -0,0 +1,119 @@
+import "./Tooltip.scss";
+
+import React, { useEffect } from "react";
+
+export const getTooltipDiv = () => {
+  const existingDiv = document.querySelector<HTMLDivElement>(
+    ".excalidraw-tooltip",
+  );
+  if (existingDiv) {
+    return existingDiv;
+  }
+  const div = document.createElement("div");
+  document.body.appendChild(div);
+  div.classList.add("excalidraw-tooltip");
+  return div;
+};
+
+export const updateTooltipPosition = (
+  tooltip: HTMLDivElement,
+  item: {
+    left: number;
+    top: number;
+    width: number;
+    height: number;
+  },
+  position: "bottom" | "top" = "bottom",
+) => {
+  const tooltipRect = tooltip.getBoundingClientRect();
+
+  const viewportWidth = window.innerWidth;
+  const viewportHeight = window.innerHeight;
+
+  const margin = 5;
+
+  let left = item.left + item.width / 2 - tooltipRect.width / 2;
+  if (left < 0) {
+    left = margin;
+  } else if (left + tooltipRect.width >= viewportWidth) {
+    left = viewportWidth - tooltipRect.width - margin;
+  }
+
+  let top: number;
+
+  if (position === "bottom") {
+    top = item.top + item.height + margin;
+    if (top + tooltipRect.height >= viewportHeight) {
+      top = item.top - tooltipRect.height - margin;
+    }
+  } else {
+    top = item.top - tooltipRect.height - margin;
+    if (top < 0) {
+      top = item.top + item.height + margin;
+    }
+  }
+
+  Object.assign(tooltip.style, {
+    top: `${top}px`,
+    left: `${left}px`,
+  });
+};
+
+const updateTooltip = (
+  item: HTMLDivElement,
+  tooltip: HTMLDivElement,
+  label: string,
+  long: boolean,
+) => {
+  tooltip.classList.add("excalidraw-tooltip--visible");
+  tooltip.style.minWidth = long ? "50ch" : "10ch";
+  tooltip.style.maxWidth = long ? "50ch" : "15ch";
+
+  tooltip.textContent = label;
+
+  const itemRect = item.getBoundingClientRect();
+  updateTooltipPosition(tooltip, itemRect);
+};
+
+type TooltipProps = {
+  children: React.ReactNode;
+  label: string;
+  long?: boolean;
+  style?: React.CSSProperties;
+  disabled?: boolean;
+};
+
+export const Tooltip = ({
+  children,
+  label,
+  long = false,
+  style,
+  disabled,
+}: TooltipProps) => {
+  useEffect(() => {
+    return () =>
+      getTooltipDiv().classList.remove("excalidraw-tooltip--visible");
+  }, []);
+  if (disabled) {
+    return null;
+  }
+  return (
+    <div
+      className="excalidraw-tooltip-wrapper"
+      onPointerEnter={(event) =>
+        updateTooltip(
+          event.currentTarget as HTMLDivElement,
+          getTooltipDiv(),
+          label,
+          long,
+        )
+      }
+      onPointerLeave={() =>
+        getTooltipDiv().classList.remove("excalidraw-tooltip--visible")
+      }
+      style={style}
+    >
+      {children}
+    </div>
+  );
+};