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arrange.md

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Pipeline

Tapin Order

  • applyRounding
  • validateFinalRect
  • validateVisibility
  • checkNeedArrange
  • ensureMeasured (*)
  • invalidateFuture
  • calcStretched
  • prepareOverride
  • doOverride
    • Assign arrangedSize based on compilation of child arrangedSize.
  • completeOverride
  • calcFlip
  • calcVisualOffset
  • buildLayoutClip
  • buildLayoutXform
  • buildRenderSize

Legacy

_DoArrangeWithError

  • Set last to LayoutSlot
  • If no visual parent, set last to viewport
    • If layout container
      • If top level and attached, set viewport to PreviousConstraint fall back to surface size
    • Else set viewport to ActualSize
    • Move viewport by Canvas.Left and Canvas.Top
  • If last, [#_Arrange]
  • Else InvalidateArrange on visual parent

_Arrange

  • If UseLayoutRounding, round finalRect
  • Sanity checks
    • Validate finalRect is not negative/NaN/infinite
    • If Collapsed, set LayoutSlot to finalRect, skip out
    • If does not have dirty arrange and LayoutSlot equals null or finalRect: skip out
  • Prepare
    • If IsContainer and no PreviousConstraint: set PreviousConstraint to [#_Measure] with size from finalRect
    • Clear LayoutClip
  • Invalidate
    • UpdateTransform
    • UpdateProjection
    • UpdateBounds
  • Framework Coercion
    • Shrink finalRect by Margin as childRect
    • Coerce size from childRect to stretched
    • Coerce size from blank size to framework
    • If stretched horizontally/vertically set framework to max of framework/stretched
    • Set offer to max of HiddenDesire and framework
    • Set LayoutSlot to finalRect
  • [#ArrangeOverride] -> response
  • Post Arrange Coercion
    • If stretched horizontally/vertically, set response to max of framework/response
    • Set LayoutXform to translate(childRect top-left)
    • If flip horizontal (FlowDirection), flip LayoutXform based on offer Width
  • Clear dirty flags
  • Set VisualOffset to childRect top-left
  • Copy RenderSize (old) to oldSize
  • If UseLayoutRounding, round response
  • Set RenderSize to response
  • Set constrainedResponse to min of response and coerced response
  • If no visual parent or visual parent is Canvas and not IsLayoutContainer: clear RenderSize, skip out
  • If not top level, adjust VisualOffset based on childRect, constrainedResponse, HorizontalAlignment, and VerticalAlignment
  • If UseLayoutRounding, round VisualOffset
  • Build LayoutXform based on VisualOffset and flipHoriz
  • Build LayoutClip
    • Set layoutClip to childRect
    • Set layoutClip top-left to min of childRect top-left and visualOffset top-left (x,y can't be negative)
    • If UseLayoutRounding, round layoutClip
    • Set frect to coerced size infinity,infinity with 0,0 top-left
    • Set LayoutClip to intersection of layoutClip and frect
  • If oldSize not equal to response and no LastRenderSize, set LastRenderSize to oldSize and propagate DirtySizeHint

ArrangeOverride

  • Control-specific layout
  • Falls into children [#_Arrange]