ControlPrimitives.h

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#pragma once
 
#include <imgui.h>
 
#include <cstdint>
#include <string>
#include <vector>
 
namespace eve::ui::controls {
 
enum class ControlEdit : uint8_t { Unchanged = 0, Changed };
 
inline ControlEdit button(const char *label, float width = 0.f, float height = 0.f) {
    const bool changed = (width > 0.f || height > 0.f) ? ImGui::Button(label, ImVec2(width, height))
                                                       : ImGui::Button(label);
    return changed ? ControlEdit::Changed : ControlEdit::Unchanged;
}
 
inline ControlEdit checkbox(const char *label, bool &value) {
    return ImGui::Checkbox(label, &value) ? ControlEdit::Changed : ControlEdit::Unchanged;
}
 
inline ControlEdit slider(const char *label, float &value, float minimum, float maximum,
                          const char *format = "%.3f") {
    return ImGui::SliderFloat(label, &value, minimum, maximum, format) ? ControlEdit::Changed
                                                                       : ControlEdit::Unchanged;
}
 
inline ControlEdit combo(const char *label, int &selected,
                         const std::vector<const char *> &items) {
    const bool changed = !items.empty() &&
                         ImGui::Combo(label, &selected, items.data(),
                                      static_cast<int>(items.size()));
    return changed ? ControlEdit::Changed : ControlEdit::Unchanged;
}
 
namespace detail {
inline int resizeInput(ImGuiInputTextCallbackData *data) {
    if (data->EventFlag != ImGuiInputTextFlags_CallbackResize) return 0;
    auto *value = static_cast<std::string *>(data->UserData);
    value->resize(static_cast<size_t>(data->BufTextLen));
    data->Buf = value->data();
    return 0;
}
}  // namespace detail
 
inline ControlEdit inputText(const char *label, std::string &value, bool multiline = false,
                             ImVec2 multilineSize = ImVec2(0.f, 96.f)) {
    if (value.capacity() == 0) value.reserve(64);
    const ImGuiInputTextFlags flags = ImGuiInputTextFlags_CallbackResize;
    const bool changed = multiline
                             ? ImGui::InputTextMultiline(label, value.data(), value.capacity() + 1,
                                                         multilineSize, flags, detail::resizeInput,
                                                         &value)
                             : ImGui::InputText(label, value.data(), value.capacity() + 1, flags,
                                                detail::resizeInput, &value);
    value.resize(std::char_traits<char>::length(value.c_str()));
    return changed ? ControlEdit::Changed : ControlEdit::Unchanged;
}
 
inline ControlEdit inputTextWithHint(const char *label, const char *hint, std::string &value) {
    if (value.capacity() == 0) value.reserve(64);
    const bool changed = ImGui::InputTextWithHint(
        label, hint, value.data(), value.capacity() + 1, ImGuiInputTextFlags_CallbackResize,
        detail::resizeInput, &value);
    value.resize(std::char_traits<char>::length(value.c_str()));
    return changed ? ControlEdit::Changed : ControlEdit::Unchanged;
}
 
}  // namespace eve::ui::controls