Method ShowStyleEditor

3rdparty/imgui/src/imgui_demo.cpp:8449–8788

We omit the ImGui:: prefix in this function, as we don't expect user to be copy and pasting this code.

// We omit the ImGui:: prefix in this function, as we don't expect user to be copy and pasting this code.
void ImGui::ShowStyleEditor(ImGuiStyle* ref)
{
    IMGUI_DEMO_MARKER("Tools/Style Editor");
    // You can pass in a reference ImGuiStyle structure to compare to, revert to and save to
    // (without a reference style pointer, we will use one compared locally as a reference)
    ImGuiStyle& style = GetStyle();
    static ImGuiStyle ref_saved_style;

    // Default to using internal storage as reference
    static bool init = true;
    if (init && ref == NULL)
        ref_saved_style = style;
    init = false;
    if (ref == NULL)
        ref = &ref_saved_style;

    // The logic behind dynamically changing 'max_border_size' is to not encourage people to increase border size too much: it'll likely reveal lots of subtle rendering artifacts and this isn't a priority right now.
    // Note that _MainScale is currently internal PLEASE DO NOT USE IN YOUR CODE.
    const float default_border_size = (float)(int)style._MainScale;
    const float max_border_size = IM_MAX(default_border_size, 2.0f);

    PushItemWidth(GetWindowWidth() * 0.50f);

    {
        // General
        SeparatorText("General");
        if ((GetIO().BackendFlags & ImGuiBackendFlags_RendererHasTextures) == 0)
        {
            BulletText("Warning: Font scaling will NOT be smooth, because\nImGuiBackendFlags_RendererHasTextures is not set!");
            BulletText("For instructions, see:");
            SameLine();
            TextLinkOpenURL("docs/BACKENDS.md", "https://github.com/ocornut/imgui/blob/master/docs/BACKENDS.md");
        }

        if (ShowStyleSelector("Colors##Selector"))
            ref_saved_style = style;
        ShowFontSelector("Fonts##Selector");
        if (DragFloat("FontSizeBase", &style.FontSizeBase, 0.20f, 5.0f, 100.0f, "%.0f"))
            style._NextFrameFontSizeBase = style.FontSizeBase; // FIXME: Temporary hack until we finish remaining work.
        SameLine(0.0f, 0.0f); Text(" (out %.2f)", GetFontSize());
        DragFloat("FontScaleMain", &style.FontScaleMain, 0.02f, 0.5f, 4.0f);
        //BeginDisabled(GetIO().ConfigDpiScaleFonts);
        DragFloat("FontScaleDpi", &style.FontScaleDpi, 0.02f, 0.5f, 4.0f);
        //SetItemTooltip("When io.ConfigDpiScaleFonts is set, this value is automatically overwritten.");
        //EndDisabled();

        // Simplified Settings (expose floating-pointer border sizes as boolean representing 0.0f or 1.0f)
        if (SliderFloat("FrameRounding", &style.FrameRounding, 0.0f, 12.0f, "%.0f"))
            style.GrabRounding = style.FrameRounding; // Make GrabRounding always the same value as FrameRounding
        { bool border = (style.WindowBorderSize > 0.0f); if (Checkbox("WindowBorder", &border)) { style.WindowBorderSize = border ? default_border_size : 0.0f; } }
        SameLine();
        { bool border = (style.FrameBorderSize > 0.0f);  if (Checkbox("FrameBorder", &border)) { style.FrameBorderSize = border ? default_border_size : 0.0f; } }
        SameLine();
        { bool border = (style.PopupBorderSize > 0.0f);  if (Checkbox("PopupBorder", &border)) { style.PopupBorderSize = border ? default_border_size : 0.0f; } }
    }

    // Save/Revert button
    if (Button("Save Ref"))