select boxes to manipulate

hw3d/App.cpp

@@ -110,8 +110,39 @@ void App::DoFrame()
 	// imgui windows to control camera and light
 	cam.SpawnControlWindow();
 	light.SpawnControlWindow();
-	// imgui window to adjust box instance parameters
-	boxes.front()->SpawnControlWindow( 69,wnd.Gfx() );
+	// imgui window to open box windows
+	if( ImGui::Begin( "Boxes" ) )
+	{
+		using namespace std::string_literals;
+		const auto preview = comboBoxIndex ? std::to_string( *comboBoxIndex ) : "Choose a box..."s;
+		if( ImGui::BeginCombo( "Box Number",preview.c_str() ) )
+		{
+			for( int i = 0; i < boxes.size(); i++ )
+			{
+				const bool selected = *comboBoxIndex == i;
+				if( ImGui::Selectable( std::to_string( i ).c_str(),selected ) )
+				{
+					comboBoxIndex = i;
+				}
+				if( selected )
+				{
+					ImGui::SetItemDefaultFocus();
+				}
+			}
+			ImGui::EndCombo();
+		}
+		if( ImGui::Button( "Spawn Control Window" ) && comboBoxIndex )
+		{
+			boxControlIds.insert( *comboBoxIndex );
+			comboBoxIndex.reset();
+		}
+	}
+	ImGui::End();
+	// imgui box attribute control windows
+	for( auto id : boxControlIds )
+	{
+		boxes[id]->SpawnControlWindow( id,wnd.Gfx() );
+	}
 
 	// present
 	wnd.Gfx().EndFrame();

hw3d/App.h

@@ -4,6 +4,7 @@
 #include "ImguiManager.h"
 #include "Camera.h"
 #include "PointLight.h"
+#include <set>
 
 class App
 {
@@ -24,4 +25,6 @@ private:
 	Camera cam;
 	PointLight light;
 	static constexpr size_t nDrawables = 180;
+	std::optional<int> comboBoxIndex;
+	std::set<int> boxControlIds;
 };
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