1 files changed, 99 insertions, 0 deletions
diff --git a/packages/excalidraw/components/hyperlink/helpers.ts b/packages/excalidraw/components/hyperlink/helpers.ts
new file mode 100644
index 0000000..75c5dad
--- /dev/null
+++ b/packages/excalidraw/components/hyperlink/helpers.ts
@@ -0,0 +1,99 @@
+import type { GlobalPoint, Radians } from "@excalidraw/math";
+import { pointFrom, pointRotateRads } from "@excalidraw/math";
+import { MIME_TYPES } from "../../constants";
+import type { Bounds } from "../../element/bounds";
+import { getElementAbsoluteCoords } from "../../element/bounds";
+import { hitElementBoundingBox } from "../../element/collision";
+import type {
+  ElementsMap,
+  NonDeletedExcalidrawElement,
+} from "../../element/types";
+import { DEFAULT_LINK_SIZE } from "../../renderer/renderElement";
+import type { AppState, UIAppState } from "../../types";
+
+export const EXTERNAL_LINK_IMG = document.createElement("img");
+EXTERNAL_LINK_IMG.src = `data:${MIME_TYPES.svg}, ${encodeURIComponent(
+  `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="#1971c2" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-external-link"><path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"></path><polyline points="15 3 21 3 21 9"></polyline><line x1="10" y1="14" x2="21" y2="3"></line></svg>`,
+)}`;
+
+export const ELEMENT_LINK_IMG = document.createElement("img");
+ELEMENT_LINK_IMG.src = `data:${MIME_TYPES.svg}, ${encodeURIComponent(
+  `<svg  xmlns="http://www.w3.org/2000/svg"  width="16"  height="16"  viewBox="0 0 24 24"  fill="none"  stroke="#1971c2"  stroke-width="2"  stroke-linecap="round"  stroke-linejoin="round"  class="icon icon-tabler icons-tabler-outline icon-tabler-arrow-big-right-line"><path stroke="none" d="M0 0h24v24H0z" fill="none"/><path d="M12 9v-3.586a1 1 0 0 1 1.707 -.707l6.586 6.586a1 1 0 0 1 0 1.414l-6.586 6.586a1 1 0 0 1 -1.707 -.707v-3.586h-6v-6h6z" /><path d="M3 9v6" /></svg>`,
+)}`;
+
+export const getLinkHandleFromCoords = (
+  [x1, y1, x2, y2]: Bounds,
+  angle: Radians,
+  appState: Pick<UIAppState, "zoom">,
+): Bounds => {
+  const size = DEFAULT_LINK_SIZE;
+  const linkWidth = size / appState.zoom.value;
+  const linkHeight = size / appState.zoom.value;
+  const linkMarginY = size / appState.zoom.value;
+  const centerX = (x1 + x2) / 2;
+  const centerY = (y1 + y2) / 2;
+  const centeringOffset = (size - 8) / (2 * appState.zoom.value);
+  const dashedLineMargin = 4 / appState.zoom.value;
+
+  // Same as `ne` resize handle
+  const x = x2 + dashedLineMargin - centeringOffset;
+  const y = y1 - dashedLineMargin - linkMarginY + centeringOffset;
+
+  const [rotatedX, rotatedY] = pointRotateRads(
+    pointFrom(x + linkWidth / 2, y + linkHeight / 2),
+    pointFrom(centerX, centerY),
+    angle,
+  );
+  return [
+    rotatedX - linkWidth / 2,
+    rotatedY - linkHeight / 2,
+    linkWidth,
+    linkHeight,
+  ];
+};
+
+export const isPointHittingLinkIcon = (
+  element: NonDeletedExcalidrawElement,
+  elementsMap: ElementsMap,
+  appState: AppState,
+  [x, y]: GlobalPoint,
+) => {
+  const threshold = 4 / appState.zoom.value;
+  const [x1, y1, x2, y2] = getElementAbsoluteCoords(element, elementsMap);
+  const [linkX, linkY, linkWidth, linkHeight] = getLinkHandleFromCoords(
+    [x1, y1, x2, y2],
+    element.angle,
+    appState,
+  );
+  const hitLink =
+    x > linkX - threshold &&
+    x < linkX + threshold + linkWidth &&
+    y > linkY - threshold &&
+    y < linkY + linkHeight + threshold;
+  return hitLink;
+};
+
+export const isPointHittingLink = (
+  element: NonDeletedExcalidrawElement,
+  elementsMap: ElementsMap,
+  appState: AppState,
+  [x, y]: GlobalPoint,
+  isMobile: boolean,
+) => {
+  if (!element.link || appState.selectedElementIds[element.id]) {
+    return false;
+  }
+  if (
+    !isMobile &&
+    appState.viewModeEnabled &&
+    hitElementBoundingBox(x, y, element, elementsMap)
+  ) {
+    return true;
+  }
+  return isPointHittingLinkIcon(
+    element,
+    elementsMap,
+    appState,
+    pointFrom(x, y),
+  );
+};