Anyone know how to get the coordinates of a widget (x,y) during runtime?
Could we use GlobalKey?
If so, how do you assign a key to a widget and then access that key within a custom function or custom action?
Got the following start from ChatGPT:
In Flutter, you can obtain the position and size of a widget using the GlobalKey in combination with RenderBox. Here's a step-by-step guide:
1. Use GlobalKey: Create a GlobalKey for your widget. This will help you later retrieve the RenderBox (which contains the size and position information) of the widget.
2. Get the RenderBox: Once your widget is built and rendered, you can use the key to get the RenderBox of the widget.
3. Obtain the position: Using the RenderBox, you can obtain the position of the widget.
Here's a function that returns the Offset representing the top-left position of the widget:
```dart
import 'package:flutter/material.dart';
Offset getWidgetPosition(GlobalKey key) {
final RenderBox renderBox = key.currentContext?.findRenderObject() as RenderBox;
return renderBox.localToGlobal(Offset.zero); // top-left point of the widget
}
void main() {
final GlobalKey widgetKey = GlobalKey();
runApp(
MaterialApp(
home: Scaffold(
appBar: AppBar(title: Text('Widget Position')),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ElevatedButton(
key: widgetKey,
onPressed: () {
final position = getWidgetPosition(widgetKey);
print('Position: $position');
},
child: Text('Click me'),
),
],
),
),
),
),
);
}
```
In this example, we've created a button with a GlobalKey. When you press the button, it'll print its top-left position on the screen.
Remember that the returned Offset (x,y) is relative to the top-left corner of the screen. Adjustments may be necessary if you want relative positions to other widgets or contexts.
Note: Overusing GlobalKey can be costly in terms of performance. Make sure to use it only when necessary.