1 files changed, 19 insertions, 0 deletions
diff --git a/web_src/js/features/file-fold.js b/web_src/js/features/file-fold.js
new file mode 100644
index 0000000..3efefaf
--- /dev/null
+++ b/web_src/js/features/file-fold.js
@@ -0,0 +1,19 @@
+import {svg} from '../svg.js';
+
+// Hides the file if newFold is true, and shows it otherwise. The actual hiding is performed using CSS.
+//
+// The fold arrow is the icon displayed on the upper left of the file box, especially intended for components having the 'fold-file' class.
+// The file content box is the box that should be hidden or shown, especially intended for components having the 'file-content' class.
+//
+export function setFileFolding(fileContentBox, foldArrow, newFold) {
+  foldArrow.innerHTML = svg(`octicon-chevron-${newFold ? 'right' : 'down'}`, 18);
+  fileContentBox.setAttribute('data-folded', newFold);
+  if (newFold && fileContentBox.getBoundingClientRect().top < 0) {
+    fileContentBox.scrollIntoView();
+  }
+}
+
+// Like `setFileFolding`, except that it automatically inverts the current file folding state.
+export function invertFileFolding(fileContentBox, foldArrow) {
+  setFileFolding(fileContentBox, foldArrow, fileContentBox.getAttribute('data-folded') !== 'true');
+}