DP-CustomResolution/CustomResolution/Windows/ConfigWindow.cs

using Dalamud.Interface.Windowing;
using ImGuiNET;
using System;
using System.Numerics;

namespace CustomResolution.Windows;

public class ConfigWindow : Window, IDisposable
{
    private int[] _displayCurrentWH = new int[2];
    private int[] _displayCurrentWindowWH = new int[2];

    private bool _configIsEnabled;
    private bool _configIsScale;
    private float _configScale;
    private int[] _configWH = new int[2];
    private bool _configIsDXVKDWMHackEnabled;

    public ConfigWindow() : base(
        "CustomResolution",
        ImGuiWindowFlags.NoResize | ImGuiWindowFlags.NoCollapse | ImGuiWindowFlags.NoScrollbar |
        ImGuiWindowFlags.NoScrollWithMouse)
    {
        Size = new Vector2(430, 212);
        SizeCondition = ImGuiCond.Always;

        UpdateFromConfig();
    }

    public void Dispose() {
    }

    public void UpdateFromConfig()
    {
        var config = Service.Config;

        _configIsEnabled = config.IsEnabled;
        _configIsScale = config.IsScale;
        _configScale = config.Scale;
        _configWH[0] = (int) config.Width;
        _configWH[1] = (int) config.Height;
        _configIsDXVKDWMHackEnabled = config.IsDXVKDWMHackEnabled;
    }

    public void UpdateToConfig()
    {
        var config = Service.Config;

        config.IsEnabled = _configIsEnabled;
        config.IsScale = _configIsScale;
        config.Scale = _configScale;
        config.Width = (uint) _configWH[0];
        config.Height = (uint) _configWH[1];
        config.IsDXVKDWMHackEnabled = _configIsDXVKDWMHackEnabled;

        config.Save();
    }

    public override void Draw()
    {
        var plugin = Service.Plugin;
        var save = false;

        _displayCurrentWH[0] = (int) plugin.CurrentWidth;
        _displayCurrentWH[1] = (int) plugin.CurrentHeight;
        _displayCurrentWindowWH[0] = (int) plugin.CurrentWindowWidth;
        _displayCurrentWindowWH[1] = (int) plugin.CurrentWindowHeight;

        ImGui.BeginDisabled();
        ImGui.InputInt2("Current window size", ref _displayCurrentWindowWH[0]);
        ImGui.InputInt2("Current render size", ref _displayCurrentWH[0]);
        ImGui.EndDisabled();

        ImGui.Checkbox("Enabled", ref _configIsEnabled);

        if (!_configIsEnabled)
        {
            ImGui.BeginDisabled();
        }

        ImGui.Checkbox("Use scale", ref _configIsScale);

        if (_configIsScale)
        {
            if (ImGui.InputFloat("Scale", ref _configScale, 0.01f, 0.1f, "%.3f", ImGuiInputTextFlags.EnterReturnsTrue))
            {
                save = true;
            }
        }
        else
        {
            ImGui.InputInt2("Size in pixels", ref _configWH[0]);
        }

        if (!_configIsEnabled)
        {
            ImGui.EndDisabled();
        }

        ImGui.Checkbox("Apply borderless window workaround", ref _configIsDXVKDWMHackEnabled);
        if (ImGui.IsItemHovered())
        {
            ImGui.SetTooltip(@"Fixes DXVK borderless window acting like exclusive fullscreen.
In other words: Fixes black screen flashing when alt-tabbing.
This can *possibly* impact performance, depending on your Windows version and GPU.
Feel free to experiment with this toggle.

Works even with the scaling above disabled.

Not intended to be used with proper fullscreen.");
        }

        if (ImGui.Button("Save and apply"))
        {
            save = true;
        }

        if (save)
        {
            UpdateToConfig();
        }
    }
}