From 8e8c1c9c822cdeec4102451ccf491725d918e3a6 Mon Sep 17 00:00:00 2001
From: Matthew B <matt-attack@users.noreply.github.com>
Date: Tue, 25 Jun 2024 22:28:22 -0700
Subject: [PATCH] Support some C++11 features, like lambdas for callbacks Fix
 double mouse up on linux

---
 gwen/include/Gwen/Events.h    |  3 +++
 gwen/include/Gwen/Input/X11.h |  3 +++
 gwen/src/events.cpp           | 12 ++++++++++++
 gwen/src/inputhandler.cpp     |  1 -
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/gwen/include/Gwen/Events.h b/gwen/include/Gwen/Events.h
index 3efa6d73..baaf33b2 100644
--- a/gwen/include/Gwen/Events.h
+++ b/gwen/include/Gwen/Events.h
@@ -8,6 +8,7 @@
 #ifndef GWEN_EVENTS_H
 #define GWEN_EVENTS_H
 
+#include <functional>
 #include <list>
 #include "Gwen/Exports.h"
 #include "Gwen/Structures.h"
@@ -112,6 +113,7 @@ namespace Gwen
 				template <typename T> void Add( Event::Handler* ob, void ( T::*f )( Gwen::Event::Info ) ) { AddInternal( ob, static_cast<Handler::FunctionWithInformation>( f ) ); }
 				template <typename T> void Add( Event::Handler* ob, void ( T::*f )( Gwen::Event::Info ), void* data ) { AddInternal( ob, static_cast<Handler::FunctionWithInformation>( f ), data ); }
 				template <typename T> void Add( Event::Handler* ob, void ( T::*f )() ) { AddInternal( ob, static_cast<Handler::FunctionBlank>( f ) ); }
+				void Add( Event::Handler* pObject, const std::function<void()> fn );
 
 				template <typename T> void GlobalAdd( Event::Handler* ob, T f ) { AddInternal( ob, static_cast<Handler::GlobalFunction>( f ) ); }
 				void GlobalAdd( Event::Handler* ob, void ( *f )( Gwen::Event::Info ) ) { AddInternal( ob, static_cast<Handler::GlobalFunctionWithInformation>( f ) ); }
@@ -152,6 +154,7 @@ namespace Gwen
 					Handler::GlobalFunction					fnGlobalFunction;
 					Handler::GlobalFunctionWithInformation	fnGlobalFunctionInfo;
 					Handler::GlobalFunctionBlank			fnGlobalFunctionBlank;
+					std::function<void()>                   fnFunctional;
 
 					Event::Handler*			pObject;
 					void*					Data;
diff --git a/gwen/include/Gwen/Input/X11.h b/gwen/include/Gwen/Input/X11.h
index df5495c6..c091deed 100644
--- a/gwen/include/Gwen/Input/X11.h
+++ b/gwen/include/Gwen/Input/X11.h
@@ -102,7 +102,10 @@ namespace Gwen
                         case ButtonPress:
                             {
 								if (event.xbutton.button == 1)
+								{
+									if (!press && !Gwen::Input::IsLeftMouseDown()) return true;
 									return Gwen::Input::OnMouseButton(0, press);
+								}
 								if (event.xbutton.button == 2)
 									return Gwen::Input::OnMouseButton(2, press);
 								if (event.xbutton.button == 3)
diff --git a/gwen/src/events.cpp b/gwen/src/events.cpp
index 5d90c71e..b4ac9936 100644
--- a/gwen/src/events.cpp
+++ b/gwen/src/events.cpp
@@ -104,9 +104,21 @@ void Caller::Call( Controls::Base* pThis, Gwen::Event::Info information )
 
 		if ( h.fnGlobalFunctionBlank )
 		{ ( *h.fnGlobalFunctionBlank )(); }
+
+		if ( h.fnFunctional )
+		{ h.fnFunctional(); }
 	}
 }
 
+void Caller::Add( Event::Handler* pObject, const std::function<void()> fn )
+{
+	handler h;
+	h.fnFunctional = fn;
+	h.pObject = pObject;
+	m_Handlers.push_back( h );
+	pObject->RegisterCaller( this );
+}
+
 void Caller::AddInternal( Event::Handler* pObject, Event::Handler::Function pFunction )
 {
 	handler h;
diff --git a/gwen/src/inputhandler.cpp b/gwen/src/inputhandler.cpp
index f963cf07..70be16c3 100644
--- a/gwen/src/inputhandler.cpp
+++ b/gwen/src/inputhandler.cpp
@@ -318,7 +318,6 @@ bool Gwen::Input::OnMouseButton( int iMouseButton, bool bDown )
 	else if ( iMouseButton == 1 )	{ KeyData.RightMouseDown = bDown; }
 
 	// Double click.
-	// Todo: Shouldn't double click if mouse has moved significantly
 	bool bIsDoubleClick = false;
 
 	if ( bDown &&