Create dedicated stylesheet for Atlas

This is meant as a central place to tweak layout per platform.

Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>

source/tools/atlas/AtlasUI/ScenarioEditor/SectionLayout.cpp

@@ -28,6 +28,7 @@
 #include "tools/atlas/AtlasUI/ScenarioEditor/Sections/Object/Object.h"
 #include "tools/atlas/AtlasUI/ScenarioEditor/Sections/Player/Player.h"
 #include "tools/atlas/AtlasUI/ScenarioEditor/Sections/Terrain/Terrain.h"
+#include "tools/atlas/AtlasUI/ScenarioEditor/StyleSheet.h"
 
 #include <cstddef>
 #include <utility>
@@ -309,10 +310,10 @@ void SectionLayout::Build(ScenarioEditor& scenarioEditor)
 
 	#undef ADD_SIDEBAR
 
-	m_VertSplitter->SetDefaultSashPosition(-BOTTOMBAR_SIZE);
+	m_VertSplitter->SetDefaultSashPosition(-Atlas::Style::BOTTOMBAR_DEFAULT_SIZE);
 	m_VertSplitter->Initialize(m_Canvas);
 
-	m_HorizSplitter->SetDefaultSashPosition(SIDEBAR_SIZE);
+	m_HorizSplitter->SetDefaultSashPosition(Atlas::Style::SIDEBAR_DEFAULT_SIZE);
 	m_HorizSplitter->SplitVertically(m_SidebarBook, m_VertSplitter);
 }
 

source/tools/atlas/AtlasUI/ScenarioEditor/SectionLayout.h

@@ -27,18 +27,6 @@ class SnapSplitterWindow;
 class wxString;
 class wxWindow;
 
-// Some platform dependent sizes
-#if defined(__WXGTK__)
-	#define SIDEBAR_SIZE 285
-	#define BOTTOMBAR_SIZE 200
-#elif defined(__WXOSX__) || defined(__WXMAC__)
-	#define SIDEBAR_SIZE 285
-	#define BOTTOMBAR_SIZE 210
-#else	// __MSW__
-	#define SIDEBAR_SIZE 235
-	#define BOTTOMBAR_SIZE 180
-#endif
-
 class SectionLayout
 {
 public:

source/tools/atlas/AtlasUI/ScenarioEditor/StyleSheet.h

@@ -0,0 +1,39 @@
+/* Copyright (C) 2026 Wildfire Games.
+ * This file is part of 0 A.D.
+ *
+ * 0 A.D. is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 0 A.D. is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef INCLUDED_ATLAS_STYLESHEET
+#define INCLUDED_ATLAS_STYLESHEET
+
+namespace Atlas::Style
+{
+
+// Platform specific values
+
+#if defined(__WXGTK__)
+constexpr int BOTTOMBAR_DEFAULT_SIZE = 200;
+constexpr int SIDEBAR_DEFAULT_SIZE = 285;
+#elif defined(__WXOSX__) || defined(__WXMAC__)
+constexpr int BOTTOMBAR_DEFAULT_SIZE = 210;
+constexpr int SIDEBAR_DEFAULT_SIZE = 285;
+#else	// __MSW__
+constexpr int BOTTOMBAR_DEFAULT_SIZE = 180;
+constexpr int SIDEBAR_DEFAULT_SIZE = 235;
+#endif
+
+} // namespace Atlas::Style
+
+#endif // INCLUDED_ATLAS_STYLESHEET