A dart/flutter API that allows you to pop up a content widget in a flutter overlay. This is the callout.

Point stuff out: Animated Callouts for Flutter #

Whether you want popup windows, callouts that popint to a target widget, or toast popups, this API does it all.

Being able have your callout to point to a target widget is very potent tool for helping your the users understand and navigate your app. A callout overlay’s pointing line can follow its target widget (by assigning the target a GlobalKey).

• pop up a callout widget that points to a target widget
  (positioning using 2 values: initialCalloutAlignment & initialTargetAlignment)

• pop up a callout widget that has no target, but can be positioned on the screen
  (positioned using an absolute screen coord: initialCalloutPos)

• pop up a callout widget as a Toast, positioned by an alignment value named gravity

• make it easy to allow dragging and resizing of callouts

• allow callouts to optionally follow scroll

• allow configuration of all aspects of callouts

• make configuration serializable (json)

The intro page leads to 4 demo pages

Callout points out target widgets, and is draggable and can follow scroll

A barrier can be configured behind the callout, with a cutout for the target.

The callout pointer can be configured, as well as a line label, and many other options.

The callouts api can also be used to pop up toast from multiple directions .

Quick Start #

To use this api, replace your use of MaterialApp with FlutterCalloutsApp, which actually creates a MaterialApp itself..

The flutter_callouts package defines many classes, the most important of which are the following…

• FlutterCalloutsApp - wraps your app.

• Global object fca - you access the api using this global object (which is an instance of FlutterCalloutMixins).

You create a callout at runtime by calling the following method:

  fca.showOverlay(
        calloutConfig: ...,
        calloutContent: ...,
        targetGkF: ...,
      );

• Serializable property classes and enums used to configure callouts:

  • AlignmentEnum
  • ArrowTypeEnum
  • ColorModel
  • DecorationShapeEnum
  • OffsetModel
  • UpTo6Colors - models a gradient

• CalloutConfigModel - the serializable callout configuration object. Its constructor takes many args, most of which, hopefully, are aptly named to not require explanation:

CalloutConfigModel({
  required this.cId,		// each callout has a unique id  
  this.callerGK,
  this.movedOrResizedNotifier,
  This.gravity,			// used for Toasts
  // "required" forces developer to consider scrolling
  required this.scrollControllerName,
  this.followScroll \= true,
  this.forceMeasure \= false,
  this.initialCalloutW,
  this.initialCalloutH,
  this.minWidth,
  this.minHeight,
  this.fillColor,
  this.decorationShape \= DecorationShapeEnum.rectangle,
  this.starPoints,		// used if callout shape is a star  
  this.circleShape \= false,
  this.noBorder \= false,
  this.borderColor,
  this.borderRadius \= 0,
  this.borderThickness \= 0,
  this.contentTranslateX,	// can offset the callout widget  
  this.contentTranslateY,
  this.targetTranslateX,	// can offset the target widget  
  this.targetTranslateY,
  this.arrowType \= ArrowTypeEnum.THIN,
  this.arrowColor,
  this.lengthDeltaPc \= 0.95,	// arrow length  
  this.animate \= false,	// animate the pointing line  
  this.toDelta,			// offset pointing line start  
  this.fromDelta,		// offset pointing line end  
  this.lineLabel,
  this.barrier,
  this.showCloseButton \= false,
  this.closeButtonPos \= const Offset(10, 10),
  this.onCloseButtonPressF,
  this.closeButtonColor \= Colors.red,
  this.initialTargetAlignment,	// used when pointing to a target widget  
  this.initialCalloutAlignment,	// used when pointing to a target widget  
  this.initialCalloutPos,	// used when no target widget to point to  
  this.frameTarget \= false,
  this.scaleTarget \= 1.0,
  this.elevation \= 0,		// callout elevation  
  this.dragHandleHeight,
  this.draggable \= true,
  this.canToggleDraggable \= false,
  this.onDragF,
  this.onDragEndedF,
  this.onDragStartedF,
  this.skipOnScreenCheck \= false,
  this.resizeableH \= false,
  this.resizeableV \= false,
  this.onResizeF,
  this.draggableColor,
  this.showGotitButton \= false,
  this.gotitAxis,
  this.onGotitPressedF,
  this.showcpi \= false,
  this.onlyOnce,		// only show this callout once  
  this.containsTextField \= false,
  this.alwaysReCalcSize \= false,
  this.ignoreCalloutResult \= false,
  this.finalSeparation,	// on initial display, animates to this separation  
  this.onDismissedF,		// callback when callout dismissed  
  this.onTickedF,
  this.onHiddenF,
  this.onAcceptedF
})

API documentation #

To learn more about the API, visit https://biancashouse.com/flutter_callouts_doc

Callout Designer #

While this package makes it easy to configure your callouts in dart, we also publish another package, flutter_content, (built on this package) that enables users to create and configure callouts visually, and have their configuration and content stored as json in their firestore database.

To learn more, please visit the flutter_content on pub.flutter-io.cn