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ue4guide

Great Overview Doc: The Slate UI Framework https://de45xmedrsdbp.cloudfront.net/Resources/files/slateTutorials_westcoast-1963123470.pdf

  • Immediate mode with rare use of coarse-grained cache invalidation (e.g. Blueprint graph editor caches layout of all the nodes but as soon as there's a change, it rebuilds everything)

  • 2 pass approach:

  • 1st Pass Bottom Up: Determine each widget's size using CacheDesiredSize & ComputeDesiredSize

  • 2nd Pass Top Down: Layout

  • 3 widget types

    • Leaf: No children e.g. STextBox

    • Compound: Fixed number of children/slots e.g. Sbutton

    • Panel: Dynamic number of children e.g. SverticalPanel

  • SWidget Components

    • ComputeDesiredSize()

    • ArrangeChildren()

    • OnPaint()

    • EventHandlers

  • SLATE_ARGUMENT similar to SLATE_ATTRIBUTE, except it can only contain value