Intro player

Scripts/UI/IntroScenePlayer.cs

@@ -0,0 +1,107 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Godot;
+using Godot.Collections;
+
+namespace Cirno.Scripts.UI;
+
+public partial class IntroScenePlayer : CanvasLayer
+{
+    [Export]
+    public Control PanelsHolder { get; private set; }
+    
+    [Export]
+    public Array<Texture2D> Images { get; private set; }
+
+    [Export]
+    public float TransitionTime = 5f;
+    
+    [Export]
+    public string NextSceneName { get; set; }
+    
+    private int _currentPanelIndex;
+    
+    private List<TextureRect> _panels = new ();
+    
+    public TextureRect CurrentPanel => _panels[_currentPanelIndex];
+
+    private double _timer = 0f;
+    
+    private bool _running = false;
+    
+    public override void _Ready()
+    {
+        _timer = 0;
+        _running = true;
+
+        foreach (var image in Images)
+        {
+            var panel = new TextureRect();
+            panel.Texture = image;
+            panel.ExpandMode = TextureRect.ExpandModeEnum.KeepSize;
+            panel.StretchMode = TextureRect.StretchModeEnum.KeepAspectCentered;
+            panel.Visible = false;
+            panel.SetModulate(new Color(panel.Modulate.R, panel.Modulate.G, panel.Modulate.B, 0f));
+            
+            PanelsHolder.CallDeferred("add_child", panel);
+            
+            _panels.Add(panel);
+        }
+        
+        var first = _panels.First();
+        first.Visible = true;
+        first.SetModulate(new Color(first.Modulate.R, first.Modulate.G, first.Modulate.B, 1f));
+        
+    }
+
+    public override void _Process(double delta)
+    {
+        if (!_running) return;
+        
+        _timer += delta;   
+
+        if (_timer >= TransitionTime)
+        {
+            _timer = 0;
+            _currentPanelIndex++;
+
+            if (_currentPanelIndex >= _panels.Count)
+            {
+                _running = false;
+                Finished();
+                return;
+            }
+
+            _running = false;
+            
+            _ = Transition();
+        }
+    }
+
+    private void Finished()
+    {
+        GetTree().ChangeSceneToFile(NextSceneName);
+    }
+
+    private async Task Transition()
+    {
+        TextureRect previousPanel = _panels[_currentPanelIndex-1];
+
+        CurrentPanel.Visible = true;
+        
+        var tween = GetTree().CreateTween();
+        tween.SetEase(Tween.EaseType.InOut);
+        tween.SetTrans(Tween.TransitionType.Linear);
+        tween.TweenProperty(previousPanel, "modulate:a", 0f, 1f);
+        
+        tween.TweenProperty(CurrentPanel, "modulate:a", 1f, 1f);
+        
+        await ToSignal(tween, "finished");
+
+        previousPanel.Visible = false;
+        
+        _running = true;
+    }
+}