APointerIndex.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
#include <compare>
#include <AUI/Platform/AInput.h>

class APointerIndex {
public:
   constexpr APointerIndex() noexcept: mValue(AInput::LBUTTON) {}
 
   static constexpr APointerIndex button(AInput::Key button) {
       assert((button == AInput::LBUTTON ||
               button == AInput::RBUTTON ||
               button == AInput::CBUTTON));
       return APointerIndex((int)button);
   }
 
   static constexpr APointerIndex finger(int fingerIndex) {
       return APointerIndex(fingerIndex + MAX_BUTTON_VALUE + 1);
   }
 

   [[nodiscard]]
   bool isButton() const noexcept {
       return mValue <= MAX_BUTTON_VALUE;
   }

   [[nodiscard]]
   bool isFinger() const noexcept {
       return mValue > MAX_BUTTON_VALUE;
   }

   AOptional<AInput::Key> button() const noexcept {
       if (!isButton()) {
           return std::nullopt;
       }
       return (AInput::Key)mValue;
   }

   AOptional<int> finger() const noexcept {
       if (!isFinger()) {
           return std::nullopt;
       }
       return mValue - MAX_BUTTON_VALUE - 1;
   }
 
   [[nodiscard]]
   auto operator<=>(const APointerIndex& rhs) const noexcept = default;
 
   [[nodiscard]]
   constexpr int rawValue() const noexcept {
       return mValue;
   }
 
private:
   int mValue;
   static constexpr int MAX_BUTTON_VALUE = AInput::RBUTTON;
 
   explicit constexpr APointerIndex(int value) : mValue(value) {}
};
 
 
inline std::ostream& operator<<(std::ostream& o, const APointerIndex& color) {
   o << "APointerIndex{";
   if (auto b = color.button()) {
       o << "button=";
       switch (*b) {
           case AInput::LBUTTON:
               o << "l";
               break;
           case AInput::RBUTTON:
               o << "r";
               break;
           case AInput::CBUTTON:
               o << "c";
               break;
           default:
               o << (int)*b;
               break;
       }
   } else if (auto b = color.finger()) {
       o << "finger=" << *b;
   }
   o << "}";
   return o;
}

© 2025 AUI Framework Contributors. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. All trademarks are property of their respective owners.