Kenburns effect on flutter

Last update: Sep 22, 2022

Overview

KenBurns

The Ken Burns effect is a type of panning and zooming effect used in video production from still imagery.

Wrap your image with a KenBurns widget

Container(
      height: 300,
      child: KenBurns(
        child: Image.network("https://lemag.nikonclub.fr/wp-content/uploads/2017/07/08.jpg", fit: BoxFit.cover,),
      ),
),

Configuration

You can configure KenBurns Widget

KenBurns(
    minAnimationDuration : Duration(milliseconds: 3000),
    maxAnimationDuration : Duration(milliseconds: 10000),
    maxScale : 8,
    child: ...
  });

Multiple images

You can display multiple child in KenBurns with a CrossFade animation

Container(
    height: 300,
    child: KenBurns.multiple(
      childLoop: 3,
      children: [
        Image.network(
          "https://www.photo-paysage.com/?file=pic_download_link/picture&pid=3100",
          fit: BoxFit.cover,
        ),
        Image.network(
          "https://cdn.getyourguide.com/img/location_img-59-1969619245-148.jpg",
          fit: BoxFit.cover,
        ),
        Image.network(
          "https://www.theglobeandmail.com/resizer/vq3O7LI3hvsjTP2N0m9NwU4W3Eg=/1500x0/filters:quality(80)/arc-anglerfish-tgam-prod-tgam.s3.amazonaws.com/public/4ETF3GZR3NA3RDDW23XDRBKKCI",
          fit: BoxFit.cover,
        ),
      ],
    ),
),

Download

dependencies:
  kenburns: ^1.0.5

License

Copyright 2019 florent37, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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Comments

Images getting out from the view.

started showing white background while changing position. KenBurns.multiple( minAnimationDuration: Duration(milliseconds: 3000), maxAnimationDuration: Duration(milliseconds: 5000),

          maxScale: 1.5,
          children: [
            Image.asset(
              'assets/img/girl.png',
              fit: BoxFit.cover,
            ),
            Image.asset(
              'assets/img/SliderLogin2.png',
              fit: BoxFit.cover,
            ),
            Image.asset(
              'assets/img/SliderLogin3.png',
              fit: BoxFit.cover,
            ),
            Image.asset(
              'assets/img/SliderLogin4.png',
              fit: BoxFit.cover,
            ),
          ],
        ),

opened by Ajit121 3

_KenBurnsState didn't handle widget update

If parent/holder of KenBurns widget will change single to multiple or vise versa there will be some errors related with animation loops and missed handling of widget update.

single -> multiple:

#0      List.[] (dart:core-patch/growable_array.dart:177:60)
#1      _KenBurnsState._buildChild (package:kenburns/kenburns.dart:313:63)
#2      _KenBurnsState.build.<anonymous closure> (package:kenburns/kenburns.dart:296:20)

multiple -> single

NoSuchMethodError: The method '%' was called on null. Receiver: null Tried calling: %()
_KenBurnsState.fire (_KenBurnsState.java:259)

I fixed it in PR https://github.com/florent37/Flutter-KenBurns/pull/5.

opened by sanekyy 1

_KenBurnsState didn't handle widget update when number of children change

Number of children change from 6 to 3 and RangeError appear

I/flutter (12049): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (12049): The following RangeError was thrown building LayoutBuilder:
I/flutter (12049): RangeError (index): Invalid value: Not in inclusive range 0..2: 6
I/flutter (12049): 
I/flutter (12049): The relevant error-causing widget was:
I/flutter (12049):   LayoutBuilder
I/flutter (12049):   file:///Users/yuriy.dorofeev/.pub-cache/hosted/pub.dartlang.org/kenburns-1.0.4/lib/kenburns.dart:301:12
I/flutter (12049): 
I/flutter (12049): When the exception was thrown, this was the stack:
I/flutter (12049): #0      List.[] (dart:core-patch/growable_array.dart:177:60)
I/flutter (12049): #1      _KenBurnsState._buildChild (package:kenburns/kenburns.dart:330:35)

I fixed it in PR #6 .

opened by sanekyy 0

Owner

Florent CHAMPIGNY

GitHub https://pub.dev/packages/kenburns

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