ACursorSelectable.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/.
 */
 
//
// Created by alex2 on 30.11.2020.
//
 
#pragma once
 
 
#include <AUI/Common/AString.h>
#include <glm/glm.hpp>
#include <AUI/Font/AFontStyle.h>
#include <AUI/Render/ATextLayoutHelper.h>
#include <AUI/Render/RenderHints.h>
#include <AUI/Platform/AInput.h>
#include <AUI/View/AView.h>
 
class API_AUI_VIEWS ACursorSelectable {
public:
   virtual ~ACursorSelectable();
 
   struct Selection
   {
       unsigned begin;
       unsigned end;
 
       [[nodiscard]]
       bool operator==(const Selection& rhs) const noexcept = default;
 
       [[nodiscard]]
       bool operator!=(const Selection& rhs) const noexcept = default;
 
       [[nodiscard]]
       bool empty() const noexcept {
           return begin == end;
       }
   };

   [[nodiscard]] virtual const AString& getText() const = 0;

   [[nodiscard]] virtual size_t length() const = 0;
   [[nodiscard]] AString selectedText() const
   {
       if (!hasSelection())
           return {};
       auto t = getText();
       return {t.begin() + selection().begin, t.begin() + selection().end };
   }

   [[nodiscard]] Selection selection() const;

   [[nodiscard]] bool hasSelection() const;

   [[nodiscard]] virtual unsigned cursorIndexByPos(glm::ivec2 pos) = 0;
 
   [[nodiscard]] virtual glm::ivec2 getPosByIndex(size_t index) = 0;

   [[nodiscard]] virtual glm::ivec2 getCursorPosition() = 0;
 

   void selectAll();

   void clearSelection();
 
   void setSelection(int cursorIndex) {
       mCursorIndex = cursorIndex;
       mCursorSelection.reset();
       onSelectionChanged();
   }
 
   void setSelection(Selection selection) {
       mCursorIndex = selection.begin;
       mCursorSelection = selection.end;
       onSelectionChanged();
   }
 
protected:
   unsigned mCursorIndex = 0;
   AOptional<unsigned> mCursorSelection;
 
   virtual bool isLButtonPressed() = 0;
   virtual AString getDisplayText() = 0;
   virtual void cursorSelectableRedraw() = 0;
   virtual void onSelectionChanged() = 0;
 
 
   void handleMouseDoubleClicked(const APointerPressedEvent& event);
   void handleMousePressed(const APointerPressedEvent& event);
   void handleMouseReleased(const APointerReleasedEvent& event);
   void handleMouseMove(const glm::ivec2& pos);
 
   template<aui::invocable Callback>
   void drawSelectionBeforeAndAfter(IRenderer& render, std::span<ARect<int>> rects, Callback&& drawText) {
       if (rects.empty()) {
           drawText();
           return;
       }
 
       auto drawRects = [&] {
           for (auto r : rects) {
               render.rectangle(ASolidBrush{}, r.p1, r.size());
           }
       };
       {
           RenderHints::PushColor c(render);
           render.setColor(AColor(1.f) - AColor(0x0078d700u));
           drawRects();
       }
 
       drawText();
 
       render.setBlending(Blending::INVERSE_DST);
       AUI_DEFER { render.setBlending(Blending::NORMAL); };
       drawRects();
   }
 
private:
   bool mIgnoreSelection = false;
 
};
 
inline std::ostream& operator<<(std::ostream& o, const ACursorSelectable::Selection& e) noexcept{
   o << "Selection";
   if (e.empty()) {
       o << "{" << e.begin << "}";
   } else {
       o << "[" << e.begin << ";" << e.end << ")";
   }
   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.