Merge branch 'master' into speedups2

1 files changed, 20 insertions, 0 deletions

diff --git a/src/Utils.ts b/src/Utils.ts
index d0d891f77..b280badd7 100644
--- a/src/Utils.ts
+++ b/src/Utils.ts
@@ -514,6 +514,26 @@ export function smoothScroll(duration: number, element: HTMLElement | HTMLElemen
     };
     animateScroll();
 }
+
+export function smoothScrollHorizontal(duration: number, element: HTMLElement | HTMLElement[], to: number) {
+    const elements = (element instanceof HTMLElement ? [element] : element);
+    const starts = elements.map(element => element.scrollLeft);
+    const startDate = new Date().getTime();
+
+    const animateScroll = () => {
+        const currentDate = new Date().getTime();
+        const currentTime = currentDate - startDate;
+        elements.map((element, i) => element.scrollLeft = easeInOutQuad(currentTime, starts[i], to - starts[i], duration));
+
+        if (currentTime < duration) {
+            requestAnimationFrame(animateScroll);
+        } else {
+            elements.forEach(element => element.scrollLeft = to);
+        }
+    };
+    animateScroll();
+}
+
 export function addStyleSheet(styleType: string = "text/css") {
     const style = document.createElement("style");
     style.type = styleType;