# 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:
```yaml
dependencies:
zoom_widget: ^2.0.0
```
## 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
```dart
import 'package:zoom_widget/zoom_widget.dart';
```
### Simple examples
Center flutter logo using all space of view port:
```dart
Zoom(
initTotalZoomOut: true,
child: Center(
child: FlutterLogo(
size: 1000,
),
),
);
```
Center text with max width and max height:
```dart
Zoom(
maxZoomWidth: 1800,
maxZoomHeight: 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.
```dart
Zoom(
maxZoomWidth: 1800,
maxZoomHeight: 1800,
onTap: (){
print("Widget clicked");
},
onPositionUpdate: (Offset position){
print(position);
},
onScaleUpdate: (double scale,double zoom){
print("$scale $zoom");
},
child: Center(
child: Text("Happy zoom!!"),
)
);
```
### Customize properties
Customizing the properties you can get amazing results.
- width (Depreceted) **double**.
- height (Depreceted) **double**.
- maxZoomWidth **double**.
- maxZoomHeight **double**.
- backgroundColor **Color**.
- canvasColor **Color**.
- onPositionUpdate() **Callaback**.
- onScaleUpdate() **Callaback**.
- onTap() **Callaback**.
- scrollWeight **double**.
- opacityScrollBars **double 0.0-1.0**.
- colorScrollBars **Color**.
- centerOnScale **bool**.
- initZoom (Depreceted) **double**.
- initPosition **Offset**.
- initScale **double**
- enableScroll **bool**.
- zoomSensibility **double**.
- doubleTapZoom **bool**.
- transformationController **TransformationController**.
- radiusScrollBars **double**.
- doubleTapScaleChange **double**.
- doubleTapAnimDuration **Duration**.
- initTotalZoomOut **bool**.
### Customized properties example
```dart
Zoom(
maxZoomWidth: 1800,
maxZoomHeight: 1800,
canvasColor: Colors.grey,
backgroundColor: Colors.orange,
colorScrollBars: Colors.purple,
opacityScrollBars: 0.9,
scrollWeight: 10.0,
centerOnScale: true,
enableScroll: true,
doubleTapZoom: true,
zoomSensibility: 0.05,
onTap: (){
print("Widget clicked");
}
onPositionUpdate: (position){
setState(() {
x=position.dx;
y=position.dy;
});
},
onScaleUpdate: (scale,zoom){
setState(() {
_zoom=zoom;
});
},
child: Center(
child: Text("x:${x.toStringAsFixed(2)} y:${y.toStringAsFixed(2)} zoom:${_zoom.toStringAsFixed(2)}",style: TextStyle(color: Colors.deepPurple,fontSize: 50),),
),
);
```
### Complex example
It can be used for more complex things like an image gallery.
**All examples of gifs are inside the example**