zoom_widget 0.1.3

Flutter Android iOS web

Widget to zoom on a canvas of modifiable size that a child widget can hold.

Flutter zoom widget #

With this widget you can create a customizable canvas in which you can zoom in flutter.

It is possible to customize virtually all the canvases of the canvas such as color, background color, acitvate and deactivate scrolls, change the color of scrolls, modify the sensitivity of the zoom, the initial zoom enters other aspects found in the construction of the Zoom class.

Installation #

Add to pubspec.yaml:

dependencies:
zoom_widget: ^0.1.3

How to use #

You only need to create an instance of the Zoom class in the child of your Scaffold or within the widget of your choice, within the child attribute, put the widget that you want to zoom in and the width and height of the canvas where it will be made zoom.

Import #

import 'package:zoom_widget/zoom_widget.dart';

Simple example #

Zoom(
    width: 1800,
    height: 1800,
    child: Center(
        child: Text("Happy zoom!!"),
    )
);

Callbacks #

It is possible to obtain the x and y position of our canvas with respect to the scrolls and and the zoom and scale of our canvas using two simple callbacks in our Zoom instance.

Zoom(
    width: 1800,
    height: 1800,
    onPositionUpdate: (Offset position){

        print(position);

    },
    onScaleUpdate: (double scale,double zoom){

        print("$scale  $zoom");

    },
    child: Center(
        child: Text("Happy zoom!!"),
    )
);

Customize properties #

Customizing the properties you can get amazing results.

  • width double.
  • height double.
  • backgroundColor Color.
  • canvasColor Color.
  • onPositionUpdate() Callaback.
  • onScaleUpdate() Callaback.
  • scrollWeight double.
  • opacityScrollBars double 0.0-1.0.
  • colorScrollBars Color.
  • centerOnScale bool.
  • initZoom double 0.0-1.0.
  • enableScroll bool.
  • zoomSensibility double.
  • doubleTapZoom bool.

Customized properties example #

Zoom(
    width: 1800,
    height: 1800,
    canvasColor: Colors.grey,
    backgroundColor: Colors.orange,
    colorScrollBars: Colors.purple,
    opacityScrollBars: 0.9,
    scrollWeight: 10.0,
    centerOnScale: true,
    enableScroll: true,
    doubleTapZoom: true,
    zoomSensibility: 2.3,
    initZoom: 0.0,
    onPositionUpdate: (position){
        setState(() {
            x=position.dx;
            y=position.dy;
        });
    },
    onScaleUpdate: (scale,zoom){
        setState(() {
            _zoom=zoom;
        });
    },
    child: Center(
        child: Text("x:${x.toStringAsFixed(2)} y:${y.toStringAsFixed(2)} zoom:${_zoom.toStringAsFixed(2)}",style: TextStyle(color: Colors.deepPurple,fontSize: 50),),
    ),
);

Examples #

Mobile #

In the example/mobile folder you will find the example ready to run with Flutter using the commands.

flutter pub get
flutter run

Desktop #

In the example/desktop folder you will find the example ready to run with Hover.

Hover - Run Flutter apps on the desktop with hot-reload

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Widget to zoom on a canvas of modifiable size that a child widget can hold.

Homepage

Documentation

API reference

Uploader

semakers@gmail.com

License

MIT (LICENSE)

Dependencies

flutter

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