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Exposure Widget

中文

This is a widget that can automatically monitor whether the child widget is exposed.

When the child widget is found in the window viewport, it begin detecting.

When stay time exceeds the exposure time condition (default is 0.5s) and the exposure area is greater than the visibility fraction condition (default 50%),It will trigger the exposure callback and record the Key value in a queue (the default is to store up to 100 keys).

When encounter the same key in the queue, it won't detect.

install

Add this to your package's pubspec.yaml file.

dependencies:
  exposure: ^1.0.3

usage

ExposureDetector({
    key: Key('exposure'),  // Custom Key
    child: childWidget, //Child Widget
    exposure: callBack // Exposure Callback
});

Examples

Scroll List Exposure

scroll Exposure

Animate Exposure

animateExposure

Dialog Exposure

dialogExposure

Configuration

  • ExposureDetectorController.instance.setFilterList：Function (default 100) Set key queue
  • ExposureDetectorController.instance.exposureTime：Int (default 500) Set exposure time condition (ms)
  • ExposureDetectorController.instance.exposureFraction：Double (default 0.5) Set visibility fraction condition
  • ExposureDetectorController.instance.updateInterval：Duration (default Duration(milliseconds: 200))Set delay detection time