feat: 动画系统第五阶段（未验收）

2026-07-16 18:49:12 +08:00
parent 9b6d008263
commit 46602803dc
23 changed files with 2591 additions and 116 deletions
@@ -0,0 +1,163 @@
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace AibisDream.FrameAnimation.Editor
+{
+    internal sealed class FrameAnimationPreviewElement : VisualElement
+    {
+        private static Texture2D checkerTexture;
+        private readonly Image image;
+        private readonly Label emptyLabel;
+        private Sprite sprite;
+        private FrameAnimationPreviewZoomMode zoomMode = FrameAnimationPreviewZoomMode.Fit;
+        private float manualZoom = 1f;
+        private Vector2 pan;
+        private Vector2 dragStart;
+        private Vector2 panStart;
+        private bool dragging;
+
+        public FrameAnimationPreviewElement()
+        {
+            AddToClassList("fa-preview");
+            focusable = true;
+            image = new Image { scaleMode = ScaleMode.ScaleToFit, pickingMode = PickingMode.Ignore };
+            image.AddToClassList("fa-preview__image");
+            emptyLabel = new Label("Empty Frame") { pickingMode = PickingMode.Ignore };
+            emptyLabel.AddToClassList("fa-preview__empty");
+            Add(image);
+            Add(emptyLabel);
+            RegisterCallback<GeometryChangedEvent>(_ => UpdateImageLayout());
+            RegisterCallback<PointerDownEvent>(OnPointerDown);
+            RegisterCallback<PointerMoveEvent>(OnPointerMove);
+            RegisterCallback<PointerUpEvent>(OnPointerUp);
+            SetBackground(FrameAnimationPreviewBackground.Checkerboard);
+        }
+
+        public void SetDisplay(Sprite value, bool isEmpty, string emptyText = "Empty Frame")
+        {
+            sprite = value;
+            image.sprite = value;
+            image.style.display = value != null ? DisplayStyle.Flex : DisplayStyle.None;
+            emptyLabel.text = string.IsNullOrEmpty(emptyText) ? "Empty Frame" : emptyText;
+            emptyLabel.style.display = value == null || isEmpty ? DisplayStyle.Flex : DisplayStyle.None;
+            UpdateImageLayout();
+        }
+
+        public void SetBackground(FrameAnimationPreviewBackground background)
+        {
+            switch (background)
+            {
+                case FrameAnimationPreviewBackground.Dark:
+                    style.backgroundImage = StyleKeyword.None;
+                    style.backgroundColor = new StyleColor(new Color(0.08f, 0.08f, 0.08f));
+                    break;
+                case FrameAnimationPreviewBackground.Light:
+                    style.backgroundImage = StyleKeyword.None;
+                    style.backgroundColor = new StyleColor(new Color(0.72f, 0.72f, 0.72f));
+                    break;
+                default:
+                    style.backgroundImage = new StyleBackground(GetCheckerTexture());
+                    style.backgroundColor = StyleKeyword.Null;
+                    break;
+            }
+        }
+
+        public void SetZoom(FrameAnimationPreviewZoomMode mode, float value)
+        {
+            zoomMode = mode;
+            manualZoom = Mathf.Clamp(value, 0.25f, 8f);
+            if (mode == FrameAnimationPreviewZoomMode.Fit)
+            {
+                pan = Vector2.zero;
+            }
+            UpdateImageLayout();
+        }
+
+        private void UpdateImageLayout()
+        {
+            if (sprite == null || resolvedStyle.width <= 0f || resolvedStyle.height <= 0f)
+            {
+                return;
+            }
+            var sourceSize = sprite.rect.size;
+            if (sourceSize.x <= 0f || sourceSize.y <= 0f)
+            {
+                return;
+            }
+            var scale = zoomMode == FrameAnimationPreviewZoomMode.Fit
+                ? Mathf.Min(resolvedStyle.width / sourceSize.x, resolvedStyle.height / sourceSize.y)
+                : GetScale();
+            var size = sourceSize * Mathf.Max(0.0001f, scale);
+            image.style.width = size.x;
+            image.style.height = size.y;
+            image.style.left = (resolvedStyle.width - size.x) * 0.5f + pan.x;
+            image.style.top = (resolvedStyle.height - size.y) * 0.5f + pan.y;
+        }
+
+        private float GetScale()
+        {
+            return zoomMode switch
+            {
+                FrameAnimationPreviewZoomMode.One => 1f,
+                FrameAnimationPreviewZoomMode.Two => 2f,
+                FrameAnimationPreviewZoomMode.Three => 3f,
+                FrameAnimationPreviewZoomMode.Four => 4f,
+                FrameAnimationPreviewZoomMode.Eight => 8f,
+                FrameAnimationPreviewZoomMode.Manual => manualZoom,
+                _ => 1f
+            };
+        }
+
+        private void OnPointerDown(PointerDownEvent evt)
+        {
+            if (zoomMode == FrameAnimationPreviewZoomMode.Fit || evt.button != 0) return;
+            dragging = true;
+            dragStart = new Vector2(evt.position.x, evt.position.y);
+            panStart = pan;
+            this.CapturePointer(evt.pointerId);
+            evt.StopPropagation();
+        }
+
+        private void OnPointerMove(PointerMoveEvent evt)
+        {
+            if (!dragging || !this.HasPointerCapture(evt.pointerId)) return;
+            var position = new Vector2(evt.position.x, evt.position.y);
+            pan = panStart + position - dragStart;
+            UpdateImageLayout();
+            evt.StopPropagation();
+        }
+
+        private void OnPointerUp(PointerUpEvent evt)
+        {
+            if (!dragging || !this.HasPointerCapture(evt.pointerId)) return;
+            dragging = false;
+            this.ReleasePointer(evt.pointerId);
+            evt.StopPropagation();
+        }
+
+        private static Texture2D GetCheckerTexture()
+        {
+            if (checkerTexture != null) return checkerTexture;
+            const int textureSize = 128;
+            const int cellSize = 8;
+            checkerTexture = new Texture2D(textureSize, textureSize, TextureFormat.RGBA32, false)
+            {
+                name = "Frame Animation Preview Checker",
+                hideFlags = HideFlags.HideAndDontSave,
+                wrapMode = TextureWrapMode.Repeat,
+                filterMode = FilterMode.Point
+            };
+            var light = new Color32(106, 106, 106, 255);
+            var dark = new Color32(78, 78, 78, 255);
+            var pixels = new Color32[textureSize * textureSize];
+            for (var y = 0; y < textureSize; y++)
+            for (var x = 0; x < textureSize; x++)
+            {
+                pixels[y * textureSize + x] = ((x / cellSize) + (y / cellSize)) % 2 == 0 ? light : dark;
+            }
+            checkerTexture.SetPixels32(pixels);
+            checkerTexture.Apply(false, true);
+            return checkerTexture;
+        }
+    }
+}