VerticalLayout.h

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/* Copyright (c) 2021 Skyward Experimental Rocketry
 * Author: Luca Erbetta
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
 
#pragma once
 
#include "View.h"
 
namespace Boardcore
{
 
class VerticalLayout : public View
{
public:
    VerticalLayout(short int spacing = 0) : View(), spacing(spacing) {}
 
    void addView(View* view, float weight)
    {
        if (weight < 0)
            weight = 0;
        childs.push_back({weight, view});
        weigthSum += weight;
 
        // Recalculated child bounds
        updateChildBounds();
 
        // Redraw
        invalidate();
    }
 
    void setBounds(Bounds bounds) override
    {
        View::setBounds(bounds);
 
        updateChildBounds();
    }
 
    void draw(mxgui::DrawingContext& dc) override
    {
        View::draw(dc);
 
        for (auto view : childs)
            view.drawable->draw(dc);
    }
 
    virtual std::vector<View*> getChilds() override
    {
        std::vector<View*> out;
        out.reserve(childs.size());
        for (auto v : childs)
            out.push_back(v.drawable);
        return out;
    }
 
private:
    void updateChildBounds()
    {
        if (weigthSum > 0)
        {
            short int avalHeight =
                getBounds().size.height - (childs.size() - 1) * spacing;
 
            short int y = 0;
 
            for (auto view : childs)
            {
                Bounds viewBounds{{0, y}, {getBounds().size.width, 0}};
 
                viewBounds.size.height =
                    avalHeight / weigthSum * view.vertWeight;
                viewBounds.pos += getBounds().pos;
 
                view.drawable->setBounds(viewBounds);
 
                y += viewBounds.size.height + spacing;
            }
        }
    }
 
    struct Child
    {
        float vertWeight;
        View* drawable;
    };
 
    float weigthSum = 0;
    short int spacing;
    std::vector<Child> childs;
};
 
}  // namespace Boardcore