From 7402896ce69e03d0218d7803f3f5c851b66207bb Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik.hautakoski@gmail.com>
Date: Mon, 30 Dec 2019 05:33:14 +0100
Subject: [PATCH] Adding Platform/Unix/X11WindowEventHandler

---
 engine.build.lua                              |  1 +
 .../Platform/Unix/X11WindowEventHandler.cpp   | 52 +++++++++++++++++++
 source/Platform/Unix/X11WindowEventHandler.h  | 29 +++++++++++
 3 files changed, 82 insertions(+)
 create mode 100644 source/Platform/Unix/X11WindowEventHandler.cpp
 create mode 100644 source/Platform/Unix/X11WindowEventHandler.h

diff --git a/engine.build.lua b/engine.build.lua
index 55ff80f..831d539 100644
--- a/engine.build.lua
+++ b/engine.build.lua
@@ -72,6 +72,7 @@ elseif TARGET_OS == "Unix" then
 		"X11Keyboard.cpp",
 		"X11Mouse.cpp",
 		"X11EventQueue.cpp",
+		"X11WindowEventHandler.cpp",
 		"UnixMisc.cpp",
 		"UnixSystem.cpp",
 		"glad_glx.c"
diff --git a/source/Platform/Unix/X11WindowEventHandler.cpp b/source/Platform/Unix/X11WindowEventHandler.cpp
new file mode 100644
index 0000000..a4ec542
--- /dev/null
+++ b/source/Platform/Unix/X11WindowEventHandler.cpp
@@ -0,0 +1,52 @@
+
+#include <Spectre/System/Log.h>
+#include "X11Display.h"
+#include "X11SharedDisplay.h"
+#include "X11WindowEventHandler.h"
+#include <X11/Xresource.h>
+
+namespace sp {
+
+// Context used to store X11Display pointer.
+::XContext X11WindowEventHandler::win_context = None;
+
+void X11WindowEventHandler::registerHandler(::Display* disp, ::Window window, X11Display *ptr)
+{
+	// Initialize context before use.
+	if (win_context == None) {
+		win_context = XUniqueContext();
+	}
+
+	// Save pointer to window.
+	XSaveContext(disp, window, win_context, (XPointer) ptr);
+}
+
+void X11WindowEventHandler::unregisterHandler(::Display* disp, ::Window window)
+{
+	// No context. nothing to do.
+	if (win_context == None) {
+		return;
+	}
+
+	XDeleteContext(disp, window, win_context);
+}
+
+void X11WindowEventHandler::process(::Display* disp, const ::XEvent& event)
+{
+	XPointer ptr;
+
+	// No context. nothing to do.
+	if (win_context == None) {
+		return;
+	}
+
+	// Get the pointer for window ID.
+	if (XFindContext(disp, event.xany.window, win_context, &ptr) == 0) {
+		X11Display* disp_ptr = (X11Display*) ptr;
+
+		// Delegate
+		disp_ptr->processEvent(event);
+	}
+}
+
+} // namespace sp
diff --git a/source/Platform/Unix/X11WindowEventHandler.h b/source/Platform/Unix/X11WindowEventHandler.h
new file mode 100644
index 0000000..79f6ed2
--- /dev/null
+++ b/source/Platform/Unix/X11WindowEventHandler.h
@@ -0,0 +1,29 @@
+
+#ifndef PLATFORM_UNIX_X11_WINDOW_EVENT_HANDLER_H
+#define PLATFORM_UNIX_X11_WINDOW_EVENT_HANDLER_H
+
+#include <X11/Xutil.h>
+#include <X11/Xlib.h>
+
+namespace sp {
+
+class X11Display;
+
+class X11WindowEventHandler
+{
+public:
+
+	static void registerHandler(::Display* disp, ::Window window, X11Display *ptr);
+
+	static void unregisterHandler(::Display* disp, ::Window window);
+
+	static void process(::Display* disp, const ::XEvent& event);
+
+protected :
+
+	static ::XContext win_context;
+};
+
+} // namespace sp
+
+#endif /* PLATFORM_UNIX_WINDOW_EVENT_HANDLER_H */