From b78ddba11e9c830ce793fb76326cf497b6cbfd71 Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik.hautakoski@gmail.com>
Date: Sun, 2 Oct 2022 17:01:40 +0200
Subject: [PATCH] Platform/Unix/X11Display: implement setDecoration()

---
 source/Platform/Unix/X11Display.cpp | 39 +++++++++++++++++++++++++++++
 source/Platform/Unix/X11Display.h   |  2 ++
 2 files changed, 41 insertions(+)

diff --git a/source/Platform/Unix/X11Display.cpp b/source/Platform/Unix/X11Display.cpp
index 9e087f6..dea7205 100644
--- a/source/Platform/Unix/X11Display.cpp
+++ b/source/Platform/Unix/X11Display.cpp
@@ -1,8 +1,10 @@
 
+#include <cstring>
 #include <Spectre/System/Log.h>
 #include <Spectre/Graphics/Image.h>
 #include "X11WindowEventHandler.h"
 #include "Xlib.h"
+#include "wm_hints.h"
 #include "GLXContext.h"
 #include "X11Display.h"
 
@@ -157,6 +159,43 @@ void X11Display::setVisible(bool visible)
 	}
 }
 
+void X11Display::setDecoration(unsigned decoration)
+{
+	Atom WMHintsAtom = Xlib::getAtom("_MOTIF_WM_HINTS", false);
+
+	Log::info("X11: Decoration");
+
+	if (WMHintsAtom) {
+		WMHints hints;
+		std::memset(&hints, 0, sizeof(hints));
+		hints.flags       = MWM_HINTS_FUNCTIONS | MWM_HINTS_DECORATIONS;
+		hints.decorations = 0;
+		hints.functions   = 0;
+
+		if (decoration & DisplayDecorate::Menu) {
+			Log::info("X11: Decoration Menu");
+			hints.decorations |= MWM_DECOR_BORDER | MWM_DECOR_TITLE | MWM_DECOR_MINIMIZE | MWM_DECOR_MENU;
+                	hints.functions |= MWM_FUNC_MOVE | MWM_FUNC_MINIMIZE;
+		}
+
+		if (decoration & DisplayDecorate::Resize) {
+			Log::info("X11: Decoration Resize");
+			hints.decorations |= MWM_DECOR_MAXIMIZE | MWM_DECOR_RESIZEH;
+			hints.functions |= MWM_FUNC_MAXIMIZE | MWM_FUNC_RESIZE;
+		}
+
+		if (decoration & DisplayDecorate::Close) {
+			Log::info("X11: Decoration Close");
+			hints.decorations |= 0;
+			hints.functions |= MWM_FUNC_CLOSE;
+		}
+
+
+		::XChangeProperty(Xlib::getDisplay(), m_win, WMHintsAtom, WMHintsAtom,
+                            32, PropModeReplace, (const unsigned char*)&hints, WMHINTS_NUM_ELEMENTS);
+	}
+}
+
 void X11Display::minimize()
 {
 	::XIconifyWindow(Xlib::getDisplay(), m_win, m_screen);
diff --git a/source/Platform/Unix/X11Display.h b/source/Platform/Unix/X11Display.h
index 403aaaf..04ee0e9 100644
--- a/source/Platform/Unix/X11Display.h
+++ b/source/Platform/Unix/X11Display.h
@@ -38,6 +38,8 @@ public :
 
 	virtual void 	setVisible(bool visible);
 
+	virtual void 	setDecoration(unsigned decoration);
+
 	virtual void 	minimize();
 
 	virtual void 	maximize();