From 12b8b3804c1b458c124ca150de4320e3fda5035e Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Wed, 7 Sep 2022 12:50:59 +0400
Subject: [PATCH] Add Ui::MapFrom for optimized mapFromGlobal(mapToGlobal(..)).

---
 ui/ui_utility.cpp | 16 ++++++++++++++++
 ui/ui_utility.h   | 10 ++++++++++
 2 files changed, 26 insertions(+)

diff --git a/ui/ui_utility.cpp b/ui/ui_utility.cpp
index ee6173d..283b340 100644
--- a/ui/ui_utility.cpp
+++ b/ui/ui_utility.cpp
@@ -222,4 +222,20 @@ int WheelDirection(not_null<QWheelEvent*> e) {
 	return (delta / absDelta);
 }
 
+QPoint MapFrom(
+		not_null<QWidget*> to,
+		not_null<QWidget*> from,
+		QPoint point) {
+	return (to->window() != from->window())
+		? to->mapFromGlobal(from->mapToGlobal(point))
+		: to->mapFrom(to->window(), from->mapTo(from->window(), point));
+}
+
+[[nodiscard]] QRect MapFrom(
+		not_null<QWidget*> to,
+		not_null<QWidget*> from,
+		QRect rect) {
+	return { MapFrom(to, from, rect.topLeft()), rect.size() };
+}
+
 } // namespace Ui
diff --git a/ui/ui_utility.h b/ui/ui_utility.h
index 420f0ff..3242ed5 100644
--- a/ui/ui_utility.h
+++ b/ui/ui_utility.h
@@ -196,4 +196,14 @@ QPointer<const Widget> MakeWeak(not_null<const Widget*> object) {
 
 int WheelDirection(not_null<QWheelEvent*> e);
 
+[[nodiscard]] QPoint MapFrom(
+	not_null<QWidget*> to,
+	not_null<QWidget*> from,
+	QPoint point);
+
+[[nodiscard]] QRect MapFrom(
+	not_null<QWidget*> to,
+	not_null<QWidget*> from,
+	QRect rect);
+
 } // namespace Ui