This package helps retrieve the current positioning coordinates of any widget in a widgets tree in your Flutter application.
Currently supported features
- Retrieve the full set of positioning coordinates of the desired widget at any time;
- Calculate the difference in positioning between two widgets and use it the way you need.
Getting widget's coordinates
RenderParametersManager object. You can set a special type for the widget's unique identifier or leave it
final renderManager = RenderParametersManager<dynamic>();
Wrap the desired widget in a
id parameter is the widget’s unique identifier.
RenderMetricsObject( id: "uniqueWidgetId", manager: renderManager, child: Container( ... ), ),
Get a bundle with the positioning coordinates of the wrapped widget.
RenderData data = renderManager.getRenderData("uniqueWidgetId");
Calculating the difference in positioning between two widgets
Wrap the widgets you want to compare in
RenderMetricsObjects. Specify two different
ids for each of them. Please note, that the
manager parameter of both widgets should contain the link to the same
RenderMetricsObject( id: "rowWidgetId", manager: renderManager, child: Row( ... ), ), RenderMetricsObject( id: "columnWidgetId", manager: renderManager, child: Column( ... ), ),
Specify two unique widget identifiers when using the
getDiffById() function and extract a bundle with the relative difference in positioning coordinates between the widgets.
ComparisonDiff diff = renderManager.getDiffById("rowWidgetId", "columnWidgetId");
What metrics can I get?
RenderData instance contains a complete set of properties that characterize any widget in a two-dimensional space.
All metrics positioning coordinates are global, meaning they are relative to the entire screen coordinate space.
RenderData also provides you an ability to get all widget keypoint XY-coordinates by calling one of special getters.
You can get the comparison relative results for each widget keypoint from the
An additional set of special getters can help you calculate the difference between two adjacent sides of two different widgets (e.g. right to left, top to bottom, etc.).
Add Render Metrics to your
dependencies: render_metrics: version
You can use both
dev versions of the package listed above in the badges bar.
All notable changes to this project will be documented in this file.
For issues, file directly in the main SurfGear repo.
If you would like to contribute to the package (e.g. by improving the documentation, solving a bug or adding a cool new feature), please review our contribution guide first and send us your pull request.
Your PRs are always welcome.
How to reach us
Please feel free to ask any questions about this package. Join our community chat on Telegram. We speak English and Russian.