From b72f0dc6e8474a65c83f7e2c938fc6356b7b5f3a Mon Sep 17 00:00:00 2001
From: wyzula-jan <jan.wyzula@psi.ch>
Date: Wed, 26 Nov 2025 13:40:28 +0100
Subject: [PATCH] fix(curve): update dap curves if data are set manually

---
 bec_widgets/widgets/plots/waveform/curve.py | 1 +
 tests/unit_tests/test_waveform.py           | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/bec_widgets/widgets/plots/waveform/curve.py b/bec_widgets/widgets/plots/waveform/curve.py
index 6b9ba105..250a83e2 100644
--- a/bec_widgets/widgets/plots/waveform/curve.py
+++ b/bec_widgets/widgets/plots/waveform/curve.py
@@ -206,6 +206,7 @@ class Curve(BECConnector, pg.PlotDataItem):
         """
         if self.config.source in ["custom", "history"]:
             self.setData(x, y)
+            self.parent_item.request_dap_update.emit()
         else:
             raise ValueError(f"Source {self.config.source} do not allow custom data setting.")
 
diff --git a/tests/unit_tests/test_waveform.py b/tests/unit_tests/test_waveform.py
index 49a5524a..142b0e73 100644
--- a/tests/unit_tests/test_waveform.py
+++ b/tests/unit_tests/test_waveform.py
@@ -496,6 +496,13 @@ def test_add_dap_curve_custom_source(qtbot, mocked_client_with_dap):
     assert dap_curve.config.signal.dap == "GaussianModel"
 
 
+def test_curve_set_data_emits_dap_update(qtbot, mocked_client):
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    c = wf.plot(x=[1, 2, 3], y=[4, 5, 6], label="test_curve")
+    with qtbot.waitSignal(wf.request_dap_update):
+        c.set_data([7, 8, 9], [10, 11, 12])
+
+
 def test_plot_custom_curve_with_inline_dap(qtbot, mocked_client_with_dap):
     """
     Supplying the `dap` kwarg when plotting custom data should auto-create the fit curve.