/// <summary>
/// Rebuilds the graphic geometry and its material on the PreRender cycle.
/// 重建图形及其材质 （处于 PreRender cycle）
/// </summary>
/// <param name="update">The current step of the rendering CanvasUpdate cycle.</param>
public virtual void Rebuild(CanvasUpdateStep update)
{
//如被剔除，则不重建
if (canvasRenderer.cull)
{
return;
}
switch (update)
{
case CanvasUpdateStep.PreRender:
if (m_VertsDirty)
{
//更新几何信息（顶点，网格）
UpdateGeometry();
m_VertsDirty = false;
}
if (m_MaterialDirty)
{
//更新图像信息（Mat，材质）
UpdateMaterial();
m_MaterialDirty = false;
}
break;
}
}
public void Rebuild(CanvasUpdateStep executing)
{
switch (executing)
{
case CanvasUpdateStep.Layout:
// It's unfortunate that we'll perform the same GetComponents querys for the tree 2 times,
// but each tree have to be fully iterated before going to the next action,
// so reusing the results would entail storing results in a Dictionary or similar,
// which is probably a bigger overhead than performing GetComponents multiple times.
PerformLayoutCalculation(m_ToRebuild, e => (e as ILayoutElement).CalculateLayoutInputHorizontal());
PerformLayoutControl(m_ToRebuild, e => (e as ILayoutController).SetLayoutHorizontal());
PerformLayoutCalculation(m_ToRebuild, e => (e as ILayoutElement).CalculateLayoutInputVertical());
PerformLayoutControl(m_ToRebuild, e => (e as ILayoutController).SetLayoutVertical());
break;
}
}
