Added ShowFontSelector(), ShowStyleSelector(). (#707)

imgui.h

@@ -133,10 +133,12 @@ namespace ImGui
     IMGUI_API void          EndFrame();                                 // ends the ImGui frame. automatically called by Render(), so most likely don't need to ever call that yourself directly. If you don't need to render you may call EndFrame() but you'll have wasted CPU already. If you don't need to render, better to not create any imgui windows instead!
     IMGUI_API void          Shutdown();
 
-    // Demo/Debug/Info
+    // Demo, Debug, Informations
     IMGUI_API void          ShowTestWindow(bool* p_open = NULL);        // create demo/test window. demonstrate most ImGui features. call this to learn about the library! try to make it always available in your application!
     IMGUI_API void          ShowMetricsWindow(bool* p_open = NULL);     // create metrics window. display ImGui internals: draw commands (with individual draw calls and vertices), window list, basic internal state, etc.
     IMGUI_API void          ShowStyleEditor(ImGuiStyle* ref = NULL);    // add style editor block (not a window). you can pass in a reference ImGuiStyle structure to compare to, revert to and save to (else it uses the default style)
+    IMGUI_API bool          ShowStyleSelector(const char* label);
+    IMGUI_API void          ShowFontSelector(const char* label);
     IMGUI_API void          ShowUserGuide();                            // add basic help/info block (not a window): how to manipulate ImGui as a end-user (mouse/keyboard controls).
 
     // Window

imgui_demo.cpp

@@ -1903,6 +1903,41 @@ void ImGui::ShowTestWindow(bool* p_open)
     ImGui::End();
 }
 
+bool ImGui::ShowStyleSelector(const char* label)
+{
+    static int style_idx = 0;
+    if (ImGui::Combo(label, &style_idx, "Classic\0Dark\0Light\0"))
+    {
+        switch (style_idx)
+        {
+        case 0: ImGui::StyleColorsClassic(); break;
+        case 1: ImGui::StyleColorsDark(); break;
+        case 2: ImGui::StyleColorsLight(); break;
+        }
+        return true;
+    }
+    return false;
+}
+
+void ImGui::ShowFontSelector(const char* label)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    ImFont* font_current = ImGui::GetFont();
+    if (ImGui::BeginCombo(label, font_current->GetDebugName()))
+    {
+        for (int n = 0; n < io.Fonts->Fonts.Size; n++)
+            if (ImGui::Selectable(io.Fonts->Fonts[n]->GetDebugName(), io.Fonts->Fonts[n] == font_current))
+                io.FontDefault = io.Fonts->Fonts[n];
+        ImGui::EndCombo();
+    }
+    ImGui::SameLine(); 
+    ShowHelpMarker(
+        "- Load additional fonts with io.Fonts->AddFontFromFileTTF().\n"
+        "- The font atlas is built when calling io.Fonts->GetTexDataAsXXXX() or io.Fonts->Build().\n"
+        "- Read FAQ and documentation in extra_fonts/ for more details.\n"
+        "- If you need to add/remove fonts at runtime (e.g. for DPI change), do it before calling NewFrame().");
+}
+
 void ImGui::ShowStyleEditor(ImGuiStyle* ref)
 {
     // You can pass in a reference ImGuiStyle structure to compare to, revert to and save to (else it compares to an internally stored reference)
@@ -1919,18 +1954,9 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
 
     ImGui::PushItemWidth(ImGui::GetWindowWidth() * 0.50f);
 
-    // Default Styles Selector
+    if (ImGui::ShowStyleSelector("Colors##Selector"))
-    static int style_idx = 0;
-    if (ImGui::Combo("Colors##Selector", &style_idx, "Classic\0Dark\0Light\0"))
-    {
-        switch (style_idx)
-        {
-        case 0: ImGui::StyleColorsClassic(); break;
-        case 1: ImGui::StyleColorsDark(); break;
-        case 2: ImGui::StyleColorsLight(); break;
-        }
         ref_saved_style = style;
-    }
+    ImGui::ShowFontSelector("Fonts##Selector");
 
     // Simplified Settings
     if (ImGui::SliderFloat("FrameRounding", &style.FrameRounding, 0.0f, 12.0f, "%.0f")) 
@@ -2050,7 +2076,6 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
     }
 
     bool fonts_opened = ImGui::TreeNode("Fonts", "Fonts (%d)", ImGui::GetIO().Fonts->Fonts.Size);
-    ImGui::SameLine(); ShowHelpMarker("Tip: Load fonts with io.Fonts->AddFontFromFileTTF()\nbefore calling io.Fonts->GetTex* functions.");
     if (fonts_opened)
     {
         ImFontAtlas* atlas = ImGui::GetIO().Fonts;