From 4836ff6b3cfccfc606ce5228867d7b08dc03ed2b Mon Sep 17 00:00:00 2001
From: moko256 <koutaro.mo@gmail.com>
Date: Fri, 27 Aug 2021 09:15:46 +0900
Subject: [PATCH] [UWP] Implement setting cursor icon. (flutter/engine#28098)

---
 .../platform/windows/flutter_window_win32.cc  |  2 +-
 .../platform/windows/flutter_window_winuwp.cc | 57 ++++++++++++++++++-
 2 files changed, 56 insertions(+), 3 deletions(-)

diff --git a/engine/src/flutter/shell/platform/windows/flutter_window_win32.cc b/engine/src/flutter/shell/platform/windows/flutter_window_win32.cc
index 9983de587e4..064eb711b2a 100644
--- a/engine/src/flutter/shell/platform/windows/flutter_window_win32.cc
+++ b/engine/src/flutter/shell/platform/windows/flutter_window_win32.cc
@@ -25,7 +25,7 @@ constexpr int kScrollOffsetMultiplier = 20;
 // Returns the arrow cursor for unknown constants.
 //
 // This map must be kept in sync with Flutter framework's
-// rendering/mouse_cursor.dart.
+// services/mouse_cursor.dart.
 static HCURSOR GetCursorByName(const std::string& cursor_name) {
   static auto* cursors = new std::map<std::string, const wchar_t*>{
       {"allScroll", IDC_SIZEALL},
diff --git a/engine/src/flutter/shell/platform/windows/flutter_window_winuwp.cc b/engine/src/flutter/shell/platform/windows/flutter_window_winuwp.cc
index c64310da8fd..634a2c71a01 100644
--- a/engine/src/flutter/shell/platform/windows/flutter_window_winuwp.cc
+++ b/engine/src/flutter/shell/platform/windows/flutter_window_winuwp.cc
@@ -4,6 +4,8 @@
 
 #include "flutter/shell/platform/windows/flutter_window_winuwp.h"
 
+#include <map>
+
 namespace flutter {
 
 // Multipler used to map controller velocity to an appropriate scroll input.
@@ -14,6 +16,58 @@ static constexpr double kControllerScrollMultiplier = 3;
 // touch. See https://github.com/flutter/flutter/issues/70201
 static constexpr int32_t kDefaultPointerDeviceId = 0;
 
+// Maps a Flutter cursor name to an CoreCursor.
+//
+// Returns the arrow cursor for unknown constants.
+//
+// This map must be kept in sync with Flutter framework's
+// services/mouse_cursor.dart.
+namespace {
+using winrt::Windows::UI::Core::CoreCursorType;
+
+std::map<std::string, const CoreCursorType> cursors{
+    {"allScroll", CoreCursorType::SizeAll},
+    {"basic", CoreCursorType::Arrow},
+    {"click", CoreCursorType::Hand},
+    {"forbidden", CoreCursorType::UniversalNo},
+    {"help", CoreCursorType::Help},
+    {"move", CoreCursorType::SizeAll},
+    {"noDrop", CoreCursorType::UniversalNo},
+    {"precise", CoreCursorType::Cross},
+    {"text", CoreCursorType::IBeam},
+    {"resizeColumn", CoreCursorType::SizeWestEast},
+    {"resizeDown", CoreCursorType::SizeNorthSouth},
+    {"resizeDownLeft", CoreCursorType::SizeNortheastSouthwest},
+    {"resizeDownRight", CoreCursorType::SizeNorthwestSoutheast},
+    {"resizeLeft", CoreCursorType::SizeWestEast},
+    {"resizeLeftRight", CoreCursorType::SizeWestEast},
+    {"resizeRight", CoreCursorType::SizeWestEast},
+    {"resizeRow", CoreCursorType::SizeNorthSouth},
+    {"resizeUp", CoreCursorType::SizeNorthSouth},
+    {"resizeUpDown", CoreCursorType::SizeNorthSouth},
+    {"resizeUpLeft", CoreCursorType::SizeNorthwestSoutheast},
+    {"resizeUpRight", CoreCursorType::SizeNortheastSouthwest},
+    {"resizeUpLeftDownRight", CoreCursorType::SizeNorthwestSoutheast},
+    {"resizeUpRightDownLeft", CoreCursorType::SizeNortheastSouthwest},
+    {"wait", CoreCursorType::Wait},
+};
+
+winrt::Windows::UI::Core::CoreCursor GetCursorByName(
+    const std::string& cursor_name) {
+  if (cursor_name == "none") {
+    return winrt::Windows::UI::Core::CoreCursor{nullptr};
+  } else {
+    auto cursor_type = CoreCursorType::Arrow;
+    auto it = cursors.find(cursor_name);
+    if (it != cursors.end()) {
+      cursor_type = it->second;
+    }
+    return winrt::Windows::UI::Core::CoreCursor(cursor_type, 0);
+  }
+}
+
+}  // namespace
+
 FlutterWindowWinUWP::FlutterWindowWinUWP(
     ABI::Windows::ApplicationModel::Core::CoreApplicationView*
         applicationview) {
@@ -72,8 +126,7 @@ PhysicalWindowBounds FlutterWindowWinUWP::GetPhysicalWindowBounds() {
 }
 
 void FlutterWindowWinUWP::UpdateFlutterCursor(const std::string& cursor_name) {
-  // TODO(clarkezone): add support for Flutter cursors:
-  // https://github.com/flutter/flutter/issues/70199
+  window_.PointerCursor(GetCursorByName(cursor_name));
 }
 
 void FlutterWindowWinUWP::OnCursorRectUpdated(const Rect& rect) {