protected override void OnCanvasHierarchyChanged()
{
// Use m_Cavas so we dont auto call CacheCanvas
Canvas currentCanvas = m_Canvas;
// Clear the cached canvas. Will be fetched below if active.
m_Canvas = null;
if (!IsActive())
{
return;
}
CacheCanvas();
if (currentCanvas != m_Canvas)
{
BrandoUIGraphicRegistry.UnregisterGraphicForCanvas(currentCanvas, this);
// Only register if we are active and enabled as OnCanvasHierarchyChanged can get called
// during object destruction and we dont want to register ourself and then become null.
if (IsActive())
{
}
BrandoUIGraphicRegistry.RegisterGraphicForCanvas(canvas, this);
}
}
/// <summary>
/// 父物体改变
/// </summary>
protected override void OnTransformParentChanged()
{
base.OnTransformParentChanged();
m_Canvas = null;
if (!IsActive())
{
return;
}
CacheCanvas();
BrandoUIGraphicRegistry.RegisterGraphicForCanvas(canvas, this);
SetAllDirty();
}
/// <summary>
/// Mark the Graphic and the canvas as having been changed.
/// </summary>
protected override void OnEnable()
{
base.OnEnable();
CacheCanvas();
BrandoUIGraphicRegistry.RegisterGraphicForCanvas(canvas, this); //注册至 Canvas
#if UNITY_EDITOR
BrandoGraphicRebuildTracker.TrackGraphic(this);
#endif
if (s_WhiteTexture == null)
{
s_WhiteTexture = Texture2D.whiteTexture;
}
SetAllDirty(); //设置为脏，等待渲染
}
/// <summary>
/// Clear references.
/// </summary>
protected override void OnDisable()
{
#if UNITY_EDITOR
BrandoGraphicRebuildTracker.UnTrackGraphic(this);
#endif
//从 Canvas 中注销
BrandoUIGraphicRegistry.UnregisterGraphicForCanvas(canvas, this);
BrandoCanvasUpdateRegistry.UnRegisterCanvasElementForRebuild(this);
if (canvasRenderer != null)
{
canvasRenderer.Clear();
}
LayoutRebuilder.MarkLayoutForRebuild(rectTransform);
base.OnDisable();
}
/// <summary>
/// 父物体改变前
/// </summary>
protected override void OnBeforeTransformParentChanged()
{
BrandoUIGraphicRegistry.UnregisterGraphicForCanvas(canvas, this);
LayoutRebuilder.MarkLayoutForRebuild(rectTransform);
}
