ControlGUI/GUI/GUIUtils/GUIParagraph.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GUI.GUIUtils
{
    public class GUIParagraph : ISizeChangedListener
    {
        // 不要长期持有WinForm控件的引用（不要长期持有拥有非托管资源和/或拥有大量托管资源的对象，为了防止环状引用，在其销毁时立即释放(一代GC)）
        WeakReference<FlowLayoutPanel> reference;

        public TargetXY Target { get; set; } = TargetXY.X;

        public int SplitEdge { get; set; } = 10;

        public enum TargetXY { X, Y }

        public Action<Control, FlowLayoutPanel> FixedPaneReferenceFunc;

        public GUIParagraph(FlowLayoutPanel weak_ref)
        {
            reference = new WeakReference<FlowLayoutPanel>(weak_ref);
        }

        public void OnSizeChanged()
        {
            if (reference.TryGetTarget(out FlowLayoutPanel pane))
            {
                var selectVal = Target switch
                {
                    TargetXY.X => pane.Width,
                    TargetXY.Y => pane.Height,
                    _ => throw new ArgumentOutOfRangeException(nameof(Target)),
                };
                int selectSize = selectVal - SplitEdge * 2;
                selectSize /= pane.Controls.Count;
                for (int i = 0; i < pane.Controls.Count; i++)
                {
                    var control = pane.Controls[i];
                    switch (Target)
                    {
                        case TargetXY.X:
                            {
                                control.Size = new Size(selectSize, control.Size.Height);
                                control.Location = new Point(SplitEdge + i * (selectSize), control.Location.Y);
                            }
                            break;
                        case TargetXY.Y:
                            {
                                control.Size = new Size(control.Size.Width, selectSize);
                                control.Location = new Point(control.Location.X, SplitEdge + i * selectSize);
                            }
                            break;
                    }
                    FixedPaneReferenceFunc?.Invoke(control, pane);
                }
            }
        }
    }
}