From b2abd5304973f0dee977a3a43ca5aa772163c301 Mon Sep 17 00:00:00 2001
From: codereader <greebo@angua.at>
Date: Mon, 20 Apr 2020 13:03:03 +0200
Subject: [PATCH] #5176: Let DR remember the shader in ShaderClipboard after
 closing, it's saved in each map's root node properties

---
 .../shaderclipboard/ShaderClipboard.cpp       | 35 +++++++++++++++++--
 1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/radiant/selection/shaderclipboard/ShaderClipboard.cpp b/radiant/selection/shaderclipboard/ShaderClipboard.cpp
index e07ff91651..be43d2e192 100644
--- a/radiant/selection/shaderclipboard/ShaderClipboard.cpp
+++ b/radiant/selection/shaderclipboard/ShaderClipboard.cpp
@@ -1,6 +1,7 @@
 #include "ShaderClipboard.h"
 
 #include "i18n.h"
+#include "imap.h"
 #include "iselectiontest.h"
 #include "iscenegraph.h"
 #include "iuimanager.h"
@@ -15,6 +16,11 @@
 namespace selection 
 {
 
+namespace
+{
+	const char* const LAST_USED_MATERIAL_KEY = "LastShaderClipboardMaterial";
+}
+
 ShaderClipboard::ShaderClipboard() :
 	_updatesDisabled(false)
 {
@@ -165,11 +171,36 @@ sigc::signal<void> ShaderClipboard::signal_sourceChanged() const
 
 void ShaderClipboard::onMapEvent(IMap::MapEvent ev)
 {
-	if (ev == IMap::MapUnloading || ev == IMap::MapLoaded)
+	switch (ev)
 	{
+	case IMap::MapUnloading:
 		// Clear the shaderclipboard, the references are most probably invalid now
 		clear();
-	}
+		break;
+
+	case IMap::MapSaving:
+		// Write the current value to the map properties on save
+		if (!_source.empty() && GlobalMapModule().getRoot())
+		{
+			GlobalMapModule().getRoot()->setProperty(LAST_USED_MATERIAL_KEY, _source.getShader());
+		}
+		break;
+
+	case IMap::MapLoaded:
+		// Try to load the last used material name from the properties
+		if (GlobalMapModule().getRoot())
+		{
+			auto shader = GlobalMapModule().getRoot()->getProperty(LAST_USED_MATERIAL_KEY);
+			
+			if (!shader.empty())
+			{
+				setSource(shader);
+				break;
+			}
+		}
+		clear();
+		break;
+	};
 }
 
 } // namespace selection