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(user.widgets.lmfit_dialog)=
LMFit Dialog
The `LMFitDialog` is a widget that is developed to be used together with the `Waveform` widget. The `Waveform` widget allows user to submit a fit request to BEC's [DAP server](https://bec.readthedocs.io/en/latest/developer/getting_started/architecture.html) choosing from a selection of [LMFit models](https://lmfit.github.io/lmfit-py/builtin_models.html#) to fit monitored data sources. The `LMFit Dialog` provides an interface to monitor these fits, including statistics and fit parameters in real time.
Within the `Waveform` widget, the dialog is accessible via the toolbar and will be automatically linked to the current waveform widget. For a more customised use, we can embed the `LMFit Dialog` in a larger GUI using the *BEC Designer*. In this case, one has to connect the `update_summary_tree` slot of the LMFit Dialog to the `dap_summary_update` signal of the Waveform widget to ensure its functionality.
## Key Features:
- **Fit Summary**: Display updates on LMFit DAP processes and fit statistics.
- **Fit Parameter**: Display current fit parameter.
- **`Waveform` Widget Integration**: Directly connect to `Waveform` widget to display fit statistics and parameters.
```{figure} /assets/widget_screenshots/lmfit_dialog.png
---
name: lmfit_dialog
---
LMFit Dialog
```
The `LMFit Dialog` widget can be connected to a `Waveform` widget to display fit statistics and parameters from the LMFit DAP process hooked up to the waveform widget. You can use the signal/slot editor from the BEC Designer to connect the `dap_summary_update` signal of the `Waveform` widget to the `update_summary_tree` slot of the LMFit Dialog.
```{figure} /assets/widget_screenshots/lmfit_dialog_connect.png
It is also possible to directly connect the `dap_summary_update` signal of the `Waveform` widget to the `update_summary_tree` slot of the LMFit Dialog in Python.
```python
waveform = Waveform(...)
lmfit_dialog = LMFitDialog(...)
waveform.dap_summary_update.connect(lmfit_dialog.update_summary_tree)
```