Lattice/Lattice.Core.Docking/Models/DockGroup.cs

using Lattice.Core.Docking.Abstractions;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace Lattice.Core.Docking.Models;

public class DockGroup : IDockElement, INotifyPropertyChanged
{
    private IDockElement _first;
    private IDockElement _second;
    private SplitDirection _orientation;
    private double _splitRatio = 0.5;
    private IDockElement? _parent;
    private double _width;
    private double _height;

    public event PropertyChangedEventHandler? PropertyChanged;

    public DockGroup(IDockElement first, IDockElement second, SplitDirection orientation)
    {
        First = first ?? throw new ArgumentNullException(nameof(first));
        Second = second ?? throw new ArgumentNullException(nameof(second));
        Orientation = orientation;
    }

    public string Id { get; } = Guid.NewGuid().ToString();

    public IDockElement? Parent
    {
        get => _parent;
        set
        {
            if (_parent != value)
            {
                _parent = value;
                OnPropertyChanged();
            }
        }
    }

    public IDockElement First
    {
        get => _first;
        set
        {
            if (_first != value)
            {
                _first = value ?? throw new ArgumentNullException(nameof(value));
                _first.Parent = this;
                OnPropertyChanged();
            }
        }
    }

    public IDockElement Second
    {
        get => _second;
        set
        {
            if (_second != value)
            {
                _second = value ?? throw new ArgumentNullException(nameof(value));
                _second.Parent = this;
                OnPropertyChanged();
            }
        }
    }

    public SplitDirection Orientation
    {
        get => _orientation;
        set
        {
            if (_orientation != value)
            {
                _orientation = value;
                OnPropertyChanged();
            }
        }
    }

    public double SplitRatio
    {
        get => _splitRatio;
        set
        {
            if (Math.Abs(_splitRatio - value) > 0.001)
            {
                _splitRatio = value;
                OnPropertyChanged();
            }
        }
    }

    public double Width
    {
        get => _width;
        set
        {
            if (Math.Abs(_width - value) > 0.001)
            {
                _width = value;
                OnPropertyChanged();
            }
        }
    }

    public double Height
    {
        get => _height;
        set
        {
            if (Math.Abs(_height - value) > 0.001)
            {
                _height = value;
                OnPropertyChanged();
            }
        }
    }

    public double MinWidth => Orientation == SplitDirection.Horizontal
        ? First.MinWidth + Second.MinWidth
        : Math.Max(First.MinWidth, Second.MinWidth);

    public double MinHeight => Orientation == SplitDirection.Vertical
        ? First.MinHeight + Second.MinHeight
        : Math.Max(First.MinHeight, Second.MinHeight);

    protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}