guide

App SDK API

Use this page to move from the App Framework concepts to exact MATLAB contracts. These links stay within the Framework reading path; each function page provides syntax, inputs, outputs, options, errors, and related APIs.

Start With The Core Contract

Definition declares an App.
layout assembles the semantic workbench.
Snapshot presents derived visible state.
CallbackContext exposes runtime capabilities to callbacks.

Browse By Capability

Capability	API entry point
Layout and controls	App SDK layout API
View snapshots	App SDK view API
Typed events	App SDK event API
Projects and sources	App SDK project API
Results	App SDK result API
Managed interactions	App SDK interaction API
Plot mechanics	App SDK plot API
Diagnostics and dialogs	App SDK diagnostic API and dialog API

Complete App SDK API

Open a function for exact MATLAB syntax, arguments, outputs, behavior, and source.

labkit.app.layout

Function	Purpose
`labkit.app.layout.button`	Add a push button with one explicit pressed callback.
`labkit.app.layout.dataTable`	Add a tabular data display with optional editing and selection.
`labkit.app.layout.field`	Add a text, numeric, choice, or logical input field.
`labkit.app.layout.fileList`	Add file selection and portable-source controls.
`labkit.app.layout.group`	Arrange related child elements without a titled boundary.
`labkit.app.layout.logPanel`	Add a text display for App log messages.
`labkit.app.layout.plotArea`	Add one or more axes rendered by an App-owned renderer.
`labkit.app.layout.rangeField`	Add an input for a numeric lower and upper bound.
`labkit.app.layout.section`	Arrange related child elements under a visible title.
`labkit.app.layout.slider`	Add a bounded numeric slider.
`labkit.app.layout.statusPanel`	Add a text display for current App status.
`labkit.app.layout.tab`	Add a named tab containing related child elements.
`labkit.app.layout.workbench`	Assemble controls and a central workspace into the root layout.
`labkit.app.layout.workspace`	Define the App's central working area and optional pages.

labkit.app.view

Function	Purpose
`labkit.app.view.Snapshot`	Build one immutable complete visible-state snapshot.

labkit.app.event

Function	Purpose
`labkit.app.event.IntervalScroll`	Describe one normalized interval scroll gesture.
`labkit.app.event.ListSelection`	Describe selected file or list item identities.
`labkit.app.event.TableCellEdit`	Describe one validated table-cell edit signal.
`labkit.app.event.TableCellSelection`	Describe selected cells in a semantic data table.

labkit.app.interaction

Function	Purpose
`labkit.app.interaction.anchorPath`	Declare an editable open or closed path on one plot axis.
`labkit.app.interaction.interpolateAnchorPath`	Build a visible path through image anchor points.
`labkit.app.interaction.interval`	Declare an editable one-dimensional plot interval.
`labkit.app.interaction.pairedAnchors`	Declare matching editable points across plot axes.
`labkit.app.interaction.pointSlots`	Declare a fixed set of editable labeled point positions.
`labkit.app.interaction.rectangle`	Declare an editable rectangular plot region.
`labkit.app.interaction.regionSelection`	Declare a transient click-or-drag region gesture.
`labkit.app.interaction.scaleBarGeometry`	Compute serializable image scale-bar overlay geometry.
`labkit.app.interaction.scaleCalibration`	Convert a known image distance into pixels per unit.
`labkit.app.interaction.scaleReference`	Declare an editable two-point scale reference.

labkit.app.plot

Function	Purpose
`labkit.app.plot.clampPointToAxes`	Keep data coordinates inside the visible axes box.
`labkit.app.plot.clearAxes`	Prepare an axes for an app-owned redraw.
`labkit.app.plot.enablePopout`	Add a standalone-figure action to an axes context menu.
`labkit.app.plot.fitAxesToGraphics`	Fit axes limits to finite plotted X/Y data.
`labkit.app.plot.fitCanvasToSource`	Fit a preview axes into a fixed-aspect pixel frame.
`labkit.app.plot.offsetPointByAxesFraction`	Move data coordinates by normalized axes fractions.
`labkit.app.plot.showMessage`	Show a centered empty-state message in an axes.

labkit.app.project

Function	Purpose
`labkit.app.project.Schema`	Declare one durable App project contract.
`labkit.app.project.emptySourceRecords`	Create an empty portable source collection.
`labkit.app.project.sourceRecord`	Create a portable source value during project migration.

labkit.app.result

Function	Purpose
`labkit.app.result.File`	Declare one validated result-package output.
`labkit.app.result.Package`	Declare one App-owned result manifest request.

labkit.app.dialog

Function	Purpose
`labkit.app.dialog.Choice`	Represent a typed dialog choice or cancellation.

labkit.app.diagnostic

Function	Purpose
`labkit.app.diagnostic.Artifact`	Describe one anonymous diagnostic-sample artifact.
`labkit.app.diagnostic.Options`	Configure one App SDK diagnostic session.
`labkit.app.diagnostic.SampleContext`	Provide bounded folders for anonymous debug samples.
`labkit.app.diagnostic.SamplePack`	Describe one typed anonymous App reproduction scenario.

Change history

2026-07-21 - Callback-safe native layout synchronizationfix | compatible
2026-07-21 - Cross-platform validation exits cleanly after settled plot fittingfix | compatible
2026-07-21 - App SDK supports equal-data-unit plot fittingfix | compatible
2026-07-20 - Figure Studio preserves common graphics and styles semantic categoriesfeat | compatible
2026-07-20 - App tools and presentation controls become more deliberatefeat | compatible
2026-07-20 - App actions require explanatory hover helpfeat | compatible
2026-07-19 - App SDK explicit contract replaces the retired UI runtimerefactor | breaking