From b6471d887b9870d01f6e8bf23371c3482cb05679 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Tue, 18 Jan 2022 16:59:59 +0100
Subject: [PATCH] Add mouse cursors support for Mac

---
 Source/Engine/Platform/Mac/MacWindow.cpp | 67 +++++++++++++++++++++++-
 Source/Engine/Platform/Mac/MacWindow.h   |  3 ++
 2 files changed, 69 insertions(+), 1 deletion(-)

diff --git a/Source/Engine/Platform/Mac/MacWindow.cpp b/Source/Engine/Platform/Mac/MacWindow.cpp
index d1eb7773a..cf045377a 100644
--- a/Source/Engine/Platform/Mac/MacWindow.cpp
+++ b/Source/Engine/Platform/Mac/MacWindow.cpp
@@ -10,6 +10,7 @@
 #include "Engine/Input/Keyboard.h"
 #include "Engine/Graphics/RenderTask.h"
 #include <Cocoa/Cocoa.h>
+#include <AppKit/AppKit.h>
 #include <QuartzCore/CAMetalLayer.h>
 
 KeyboardKeys GetKey(NSEvent* event)
@@ -308,12 +309,13 @@ Vector2 GetMousePosition(MacWindow* window, NSEvent* event)
 - (void)mouseEntered:(NSEvent*)event
 {
     IsMouseOver = true;
+    Window->SetIsMouseOver(true);
 }
 
 - (void)mouseExited:(NSEvent*)event
 {
     IsMouseOver = false;
-	Input::Mouse->OnMouseLeave(Window);
+    Window->SetIsMouseOver(false);
 }
 
 - (void)mouseDown:(NSEvent*)event
@@ -483,6 +485,25 @@ void MacWindow::CheckForResize(float width, float height)
 	}
 }
 
+void MacWindow::SetIsMouseOver(bool value)
+{
+    if (_isMouseOver == value)
+        return;
+    _isMouseOver = value;
+    if (value)
+    {
+        // Refresh cursor typet
+        SetCursor(_cursor);
+        
+    }
+    else
+    {
+	    Input::Mouse->OnMouseLeave(this);
+        if (_cursor == CursorType::Hidden)
+            [NSCursor unhide];
+    }
+}
+
 void* MacWindow::GetNativePtr() const
 {
     return _window;
@@ -592,4 +613,48 @@ void MacWindow::SetTitle(const StringView& title)
     [window setTitle:(__bridge NSString*)MacUtils::ToString(_title)];
 }
 
+void MacWindow::SetCursor(CursorType type)
+{
+	WindowBase::SetCursor(type);
+    if (!_isMouseOver)
+        return;
+    NSCursor* cursor = nullptr;
+    switch (type)
+    {
+    case CursorType::Cross:
+        cursor = [NSCursor crosshairCursor];
+        break;
+    case CursorType::Hand:
+        cursor = [NSCursor pointingHandCursor];
+        break;
+    case CursorType::IBeam:
+        cursor = [NSCursor IBeamCursor];
+        break;
+    case CursorType::No:
+        cursor = [NSCursor operationNotAllowedCursor];
+        break;
+    case CursorType::SizeAll:
+    case CursorType::SizeNESW:
+    case CursorType::SizeNWSE:
+        cursor = [NSCursor resizeUpDownCursor];
+        break;
+    case CursorType::SizeNS:
+        cursor = [NSCursor resizeUpDownCursor];
+        break;
+    case CursorType::SizeWE:
+        cursor = [NSCursor resizeLeftRightCursor];
+        break;
+    case CursorType::Hidden:
+        [NSCursor hide];
+        return;
+    default:
+        cursor = [NSCursor arrowCursor];
+        break;
+    }
+    if (cursor)
+    {
+        [cursor set];
+    }
+}
+
 #endif
diff --git a/Source/Engine/Platform/Mac/MacWindow.h b/Source/Engine/Platform/Mac/MacWindow.h
index 0693a8b5a..c5e98f643 100644
--- a/Source/Engine/Platform/Mac/MacWindow.h
+++ b/Source/Engine/Platform/Mac/MacWindow.h
@@ -16,6 +16,7 @@ private:
 
     Vector2 _clientSize;
     void* _window;
+    bool _isMouseOver = false;
 
 public:
 
@@ -23,6 +24,7 @@ public:
 	~MacWindow();
 
     void CheckForResize(float width, float height);
+    void SetIsMouseOver(bool value);
 
 public:
 
@@ -40,6 +42,7 @@ public:
     void SetOpacity(float opacity) override;
     void Focus() override;
     void SetTitle(const StringView& title) override;
+	void SetCursor(CursorType type) override;
 };
 
 #endif