AScrollAreaViewport.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2024 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 "AViewContainer.h"
#include "AScrollbar.h"
#include "glm/fwd.hpp"
 
 
class API_AUI_VIEWS AScrollAreaViewport: public AViewContainerBase {
public:
    AScrollAreaViewport();
    ~AScrollAreaViewport() override;
 
    void setContents(_<AView> content);
 
    [[nodiscard]]
    const _<AView>& contents() const noexcept {
        return mContents;
    }
 
    void applyGeometryToChildren() override;
  
    void setScroll(glm::uvec2 scroll) {
        if (mScroll == scroll) [[unlikely]] {
            return;
        }
        mScroll = scroll;
        updateContentsScroll();
    }
 
    void setScrollX(unsigned scroll) {
        if (mScroll.x == scroll) [[unlikely]] {
            return;
        }
        mScroll.x = scroll;
        updateContentsScroll();
    }
 
    void setScrollY(unsigned scroll) {
        if (mScroll.y == scroll) [[unlikely]] {
            return;
        }
        mScroll.y = scroll;
        updateContentsScroll();
    }
 
    [[nodiscard]]
    glm::uvec2 scroll() const noexcept {
        return mScroll;
    }
 
private:
    class Inner;
    _<Inner> mInner;
    _<AView> mContents;
 
    glm::uvec2 mScroll = {0, 0};
 
    void updateContentsScroll();
};