Add preliminary festival handling

Glamourer/Gui/GenericPopupWindow.cs

@@ -0,0 +1,73 @@
+using System.Numerics;
+using Dalamud.Interface;
+using Dalamud.Interface.Windowing;
+using ImGuiNET;
+using OtterGui;
+using OtterGui.Raii;
+
+namespace Glamourer.Gui;
+
+public class GenericPopupWindow : Window
+{
+    private Configuration _config;
+    public  bool          OpenFestivalPopup { get; internal set; } = false;
+
+    public GenericPopupWindow(Configuration config)
+        : base("Glamourer Popups",
+            ImGuiWindowFlags.NoBringToFrontOnFocus
+          | ImGuiWindowFlags.NoDecoration
+          | ImGuiWindowFlags.NoInputs
+          | ImGuiWindowFlags.NoSavedSettings
+          | ImGuiWindowFlags.NoBackground
+          | ImGuiWindowFlags.NoMove
+          | ImGuiWindowFlags.NoNav
+          | ImGuiWindowFlags.NoTitleBar, true)
+    {
+        _config = config;
+        IsOpen  = true;
+    }
+
+    public override void Draw()
+    {
+        if (OpenFestivalPopup)
+        {
+            ImGui.OpenPopup("FestivalPopup");
+            OpenFestivalPopup = false;
+        }
+
+        DrawFestivalPopup();
+    }
+
+
+    private void DrawFestivalPopup()
+    {
+        var viewportSize = ImGui.GetWindowViewport().Size;
+        ImGui.SetNextWindowSize(new Vector2(viewportSize.X / 5, viewportSize.Y / 7));
+        ImGui.SetNextWindowPos(viewportSize / 2, ImGuiCond.Always, new Vector2(0.5f));
+        using var popup = ImRaii.Popup("FestivalPopup", ImGuiWindowFlags.Modal);
+        if (!popup)
+            return;
+
+        ImGuiUtil.TextWrapped(
+            "Glamourer has some festival-specific behaviour that is turned on by default. You can always turn this behaviour on or off in the general settings, and choose your current preference now.");
+
+        var buttonWidth = new Vector2(150 * ImGuiHelpers.GlobalScale, 0);
+        var yPos        = ImGui.GetWindowHeight() - 2 * ImGui.GetFrameHeight();
+        var xPos        = (ImGui.GetWindowWidth() - ImGui.GetStyle().ItemSpacing.X) / 2 - buttonWidth.X;
+        ImGui.SetCursorPos(new Vector2(xPos, yPos));
+        if (ImGui.Button("Let's Check It Out!", buttonWidth))
+        {
+            _config.DisableFestivals = 0;
+            _config.Save();
+            ImGui.CloseCurrentPopup();
+        }
+
+        ImGui.SameLine();
+        if (ImGui.Button("Not Right Now.", buttonWidth))
+        {
+            _config.DisableFestivals = 2;
+            _config.Save();
+            ImGui.CloseCurrentPopup();
+        }
+    }
+}