Add ImGui::Combo and ListBox utilities for tg::span

debugging/glow-extras/debugging/imgui-util.cc

@@ -3,6 +3,17 @@
 
 #include <imgui/imgui.h>
 
+namespace
+{
+bool span_getter(void* data, int i, const char** out)
+{
+    if (i < 0)
+        return false;
+    *out = static_cast<std::string*>(data)[unsigned(i)].c_str();
+    return true;
+};
+}
+
 void glow::debugging::applyGlowImguiTheme(bool darkMode)
 {
     ImGuiStyle& style = ImGui::GetStyle();
@@ -144,4 +155,18 @@ void glow::debugging::applyGlowImguiTheme(bool darkMode)
 #endif
 }
 
+bool glow::debugging::imgui::Combo(char const* label, int* currIndex, tg::span<std::string> values)
+{
+    if (values.empty())
+        return false;
+    return ::ImGui::Combo(label, currIndex, span_getter, values.data(), int(values.size()));
+}
+
+bool glow::debugging::imgui::ListBox(char const* label, int* currIndex, tg::span<std::string> values)
+{
+    if (values.empty())
+        return false;
+    return ::ImGui::ListBox(label, currIndex, span_getter, values.data(), int(values.size()));
+}
+
 #endif