最近学习一下Unity3D原生UI的源码，基于代码版本Tag: 5.5.0f3。
本系列文章列表
分析以下几个主要的类：
- Graphic：图像绘制
- MaskableGraphic：图像与遮罩
- EventSystem：事件系统
- InputModule：输入模块
- BaseRaycaster：射线投射
- ExecuteEvents：事件执行
- Selectable：可交互对象
- LayoutGroup：自动布局
- BaseMeshEffect：网格特效
详解几个重要的UI组件：
其它：
期间自己编写的UI组件，已托管在GitHub：
概览
文件结构
两个文件夹UnityEngine.UI和UnityEditor.UI：
UnityEngine.UI：
存放UI各系统及组件的实现代码：
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97|____UnityEngine.UI
| |____EventSystem
| | |____EventData
| | | |____AxisEventData.cs
| | | |____BaseEventData.cs
| | | |____PointerEventData.cs
| | |____EventHandle.cs
| | |____EventInterfaces.cs
| | |____EventSystem.cs
| | |____EventTrigger.cs
| | |____EventTriggerType.cs
| | |____ExecuteEvents.cs
| | |____InputModules
| | | |____BaseInput.cs
| | | |____BaseInputModule.cs
| | | |____PointerInputModule.cs
| | | |____StandaloneInputModule.cs
| | | |____TouchInputModule.cs
| | |____MoveDirection.cs
| | |____RaycasterManager.cs
| | |____Raycasters
| | | |____BaseRaycaster.cs
| | | |____Physics2DRaycaster.cs
| | | |____PhysicsRaycaster.cs
| | |____RaycastResult.cs
| | |____UIBehaviour.cs
| |____UI
| | |____Animation
| | | |____CoroutineTween.cs
| | |____Core
| | | |____AnimationTriggers.cs
| | | |____Button.cs
| | | |____CanvasUpdateRegistry.cs
| | | |____ColorBlock.cs
| | | |____Culling
| | | | |____ClipperRegistry.cs
| | | | |____Clipping.cs
| | | | |____IClipRegion.cs
| | | | |____RectangularVertexClipper.cs
| | | |____DefaultControls.cs
| | | |____Dropdown.cs
| | | |____FontData.cs
| | | |____FontUpdateTracker.cs
| | | |____Graphic.cs
| | | |____GraphicRaycaster.cs
| | | |____GraphicRebuildTracker.cs
| | | |____GraphicRegistry.cs
| | | |____IGraphicEnabledDisabled.cs
| | | |____Image.cs
| | | |____IMask.cs
| | | |____IMaskable.cs
| | | |____InputField.cs
| | | |____Layout
| | | | |____AspectRatioFitter.cs
| | | | |____CanvasScaler.cs
| | | | |____ContentSizeFitter.cs
| | | | |____GridLayoutGroup.cs
| | | | |____HorizontalLayoutGroup.cs
| | | | |____HorizontalOrVerticalLayoutGroup.cs
| | | | |____ILayoutElement.cs
| | | | |____LayoutElement.cs
| | | | |____LayoutGroup.cs
| | | | |____LayoutRebuilder.cs
| | | | |____LayoutUtility.cs
| | | | |____VerticalLayoutGroup.cs
| | | |____Mask.cs
| | | |____MaskableGraphic.cs
| | | |____MaskUtilities.cs
| | | |____MaterialModifiers
| | | | |____IMaterialModifier.cs
| | | |____Misc.cs
| | | |____Navigation.cs
| | | |____RawImage.cs
| | | |____RectMask2D.cs
| | | |____Scrollbar.cs
| | | |____ScrollRect.cs
| | | |____Selectable.cs
| | | |____SetPropertyUtility.cs
| | | |____Slider.cs
| | | |____SpecializedCollections
| | | | |____IndexedSet.cs
| | | |____SpriteState.cs
| | | |____StencilMaterial.cs
| | | |____Text.cs
| | | |____Toggle.cs
| | | |____ToggleGroup.cs
| | | |____Utility
| | | | |____ListPool.cs
| | | | |____ObjectPool.cs
| | | | |____ReflectionMethodsCache.cs
| | | | |____VertexHelper.cs
| | | |____VertexModifiers
| | | | |____BaseMeshEffect.cs
| | | | |____IMeshModifier.cs
| | | | |____Outline.cs
| | | | |____PositionAsUV1.cs
| | | | |____Shadow.cs
UnityEditor.UI
各UI组件提供编辑器的支持：
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39|____UnityEditor.UI
| |____EventSystem
| | |____EventSystemEditor.cs
| | |____EventTriggerEditor.cs
| |____UI
| | |____AspectRatioFitterEditor.cs
| | |____AssemblyInfo.cs
| | |____ButtonEditor.cs
| | |____CanvasScalerEditor.cs
| | |____ContentSizeFitterEditor.cs
| | |____DropdownEditor.cs
| | |____GraphicEditor.cs
| | |____GridLayoutGroupEditor.cs
| | |____HorizontalOrVerticalLayoutGroupEditor.cs
| | |____ImageEditor.cs
| | |____InputFieldEditor.cs
| | |____InterceptedEventsPreview.cs
| | |____LayoutElementEditor.cs
| | |____LayoutPropertiesPreview.cs
| | |____MaskEditor.cs
| | |____MenuOptions.cs
| | |____PrefabLayoutRebuilder.cs
| | |____PropertyDrawers
| | | |____AnimationTriggersDrawer.cs
| | | |____ColorBlockDrawer.cs
| | | |____DropdownOptionListDrawer.cs
| | | |____FontDataDrawer.cs
| | | |____NavigationDrawer.cs
| | | |____SpriteStateDrawer.cs
| | |____RawImageEditor.cs
| | |____RectMask2DEditor.cs
| | |____ScrollbarEditor.cs
| | |____ScrollRectEditor.cs
| | |____SelectableEditor.cs
| | |____SelfControllerEditor.cs
| | |____SliderEditor.cs
| | |____SpriteDrawUtility.cs
| | |____TextEditor.cs
| | |____ToggleEditor.cs
主要的类和接口
类的关系图如下：
[ 点击这里看大图 ]
