From 46a96af3df414dac429f00968538b76f15909011 Mon Sep 17 00:00:00 2001
From: Lendemor <thomas.brandeho@gmail.com>
Date: Fri, 5 Jan 2018 18:34:23 +0100
Subject: [PATCH] added wrapper for combo and listbox : can be used with
 std::vector<std::string>

---
 src/imgui.cpp | 23 +++++++++++++++++++++++
 src/imgui.h   |  4 ++++
 2 files changed, 27 insertions(+)

diff --git a/src/imgui.cpp b/src/imgui.cpp
index ff4617b..6f25662 100644
--- a/src/imgui.cpp
+++ b/src/imgui.cpp
@@ -1843,6 +1843,15 @@ ImGuiID ImGuiWindow::GetIDNoKeepAlive(const char* str, const char* str_end)
 // Internal API exposed in imgui_internal.h
 //-----------------------------------------------------------------------------
 
+//used by listbox/combo wrapper for compatibility with std::vector
+static auto vector_getter = [](void* vec, int idx, const char** out_text)
+{
+    auto& vector = *static_cast<std::vector<std::string>*>(vec);
+    if (idx < 0 || idx >= static_cast<int>(vector.size())) { return false; }
+    *out_text = vector.at(idx).c_str();
+    return true;
+};
+
 static void SetCurrentWindow(ImGuiWindow* window)
 {
     ImGuiContext& g = *GImGui;
@@ -8433,6 +8442,13 @@ static bool Items_SingleStringGetter(void* data, int idx, const char** out_text)
     return true;
 }
 
+// Combo box helper allowing to pass a vector of std::string.
+bool ImGui::Combo(const char* label, int* current_item, std::vector<std::string>& items)
+{
+    if (items.empty()) { return false; }
+    return Combo(label, current_item, vector_getter, static_cast<void*>(&items), items.size());
+}
+
 // Combo box helper allowing to pass an array of strings.
 bool ImGui::Combo(const char* label, int* current_item, const char* const* items, int items_count, int height_in_items)
 {
@@ -8711,6 +8727,12 @@ void ImGui::ListBoxFooter()
     EndGroup();
 }
 
+bool ImGui::ListBox(const char* label, int* current_item, std::vector<std::string>& items)
+{
+    if (items.empty()) { return false; }
+    return ListBox(label, current_item, vector_getter, static_cast<void*>(&items), items.size());
+}
+
 bool ImGui::ListBox(const char* label, int* current_item, const char* const* items, int items_count, int height_items)
 {
     const bool value_changed = ListBox(label, current_item, Items_ArrayGetter, (void*)items, items_count, height_items);
@@ -9855,3 +9877,4 @@ void ImGui::ShowMetricsWindow(bool* p_open)
 #endif
 
 //-----------------------------------------------------------------------------
+
diff --git a/src/imgui.h b/src/imgui.h
index bf68717..44f7770 100644
--- a/src/imgui.h
+++ b/src/imgui.h
@@ -15,6 +15,8 @@
 #include <stdarg.h>         // va_list
 #include <stddef.h>         // ptrdiff_t, NULL
 #include <string.h>         // memset, memmove, memcpy, strlen, strchr, strcpy, strcmp
+#include <vector>
+#include <string>
 
 #define IMGUI_VERSION       "1.50 WIP"
 
@@ -265,6 +267,7 @@ namespace ImGui
     IMGUI_API bool          CheckboxFlags(const char* label, unsigned int* flags, unsigned int flags_value);
     IMGUI_API bool          RadioButton(const char* label, bool active);
     IMGUI_API bool          RadioButton(const char* label, int* v, int v_button);
+    IMGUI_API bool          Combo(const char* label, int* current_item, std::vector<std::string>& items);
     IMGUI_API bool          Combo(const char* label, int* current_item, const char* const* items, int items_count, int height_in_items = -1);
     IMGUI_API bool          Combo(const char* label, int* current_item, const char* items_separated_by_zeros, int height_in_items = -1);      // separate items with \0, end item-list with \0\0
     IMGUI_API bool          Combo(const char* label, int* current_item, bool (*items_getter)(void* data, int idx, const char** out_text), void* data, int items_count, int height_in_items = -1);
@@ -339,6 +342,7 @@ namespace ImGui
     // Widgets: Selectable / Lists
     IMGUI_API bool          Selectable(const char* label, bool selected = false, ImGuiSelectableFlags flags = 0, const ImVec2& size = ImVec2(0,0));  // size.x==0.0: use remaining width, size.x>0.0: specify width. size.y==0.0: use label height, size.y>0.0: specify height
     IMGUI_API bool          Selectable(const char* label, bool* p_selected, ImGuiSelectableFlags flags = 0, const ImVec2& size = ImVec2(0,0));
+    IMGUI_API bool          ListBox(const char* label, int* current_item, std::vector<std::string>& items);
     IMGUI_API bool          ListBox(const char* label, int* current_item, const char* const* items, int items_count, int height_in_items = -1);
     IMGUI_API bool          ListBox(const char* label, int* current_item, bool (*items_getter)(void* data, int idx, const char** out_text), void* data, int items_count, int height_in_items = -1);
     IMGUI_API bool          ListBoxHeader(const char* label, const ImVec2& size = ImVec2(0,0)); // use if you want to reimplement ListBox() will custom data or interactions. make sure to call ListBoxFooter() afterwards.