ASplitterHelper.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 <AUI/Util/ALayoutDirection.h>
#include <AUI/View/AView.h>
 
class ASplitterHelper {
   friend class ASplitter;
public:
   struct Item {
       _<AView> view;
       AOptional<int> overridedSize;
   };
 
   ASplitterHelper() = default;
   ASplitterHelper(ALayoutDirection direction) : mDirection(direction) {}
 
   void setDirection(ALayoutDirection direction) {
       mDirection = direction;
   }
 
   void beginDrag(const glm::ivec2& mousePos);
   bool mouseDrag(const glm::ivec2& mousePos);
   void endDrag() {
       mDraggingDividerIndex = -1;
   }
 
   [[nodiscard]]
   const AVector<Item>& items() const { return mItems; }
 
   void setItems(AVector<Item> items) {
       mItems = std::move(items);
   }
 
   void setItems(const AVector<_<AView>>& items) {
       mItems = items.map([](const _<AView>& view) { return Item { .view = view }; });
   }
 
   [[nodiscard]]
   bool isDragging() const {
       return mDraggingDividerIndex != -1;
   }
 
   bool isDraggingArea(glm::ivec2 position);

   int reclaimSpace(int space, size_t dividerIndex);

   int reclaimSpace(int space) {
       return reclaimSpace(space, mItems.size() - 1);
   }
 
private:
   ALayoutDirection mDirection; // will be initialized in the Builder
   size_t mDraggingDividerIndex = -1;
   int mDragOffset; // may be uninitialized
   AVector<Item> mItems;
 
   float getTotalOccupiedSizeOf(const _<AView>& view) {
       return mDirection == ALayoutDirection::VERTICAL ? view->getTotalOccupiedHeight() : view->getTotalOccupiedWidth();
   }
 
   template<typename T>
   [[nodiscard]]
   T& getAxisValue(glm::tvec2<T>& v) {
       return aui::layout_direction::getAxisValue(mDirection, v);
   }
 
   template<typename T>
   [[nodiscard]]
   T getAxisValue(const glm::tvec2<T>& v) {
       return aui::layout_direction::getAxisValue(mDirection, v);
   }
 
};
 
 

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