From aeaabd028f7f627c4fe06f32330800aa0c30facc Mon Sep 17 00:00:00 2001
From: Sven Augustin <sven.augustin@psi.ch>
Date: Fri, 27 Jan 2023 18:50:34 +0100
Subject: [PATCH] connect tooltip display with xy coords to plot mouse-over
 event

---
 grum/mdi/mdisubplot.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/grum/mdi/mdisubplot.py b/grum/mdi/mdisubplot.py
index 57ca35d..53bc67e 100644
--- a/grum/mdi/mdisubplot.py
+++ b/grum/mdi/mdisubplot.py
@@ -10,6 +10,18 @@ class MDISubPlotBase(MDISubWindow):
         self.pw = pw = pg.PlotWidget()
         self.setWidget(pw)
 
+        # connect to plot mouse-over event
+        pw.scene().sigMouseMoved.connect(self.on_hover)
+
+
+    def on_hover(self, event):
+        coord = self.pw.plotItem.vb.mapSceneToView(event)
+        x = coord.x()
+        y = coord.y()
+        x = round(x, 3)
+        y = round(y, 3)
+        self.setToolTip(f"x = {x}\ny = {y}")
+
 
 
 class MDISubPlot(MDISubPlotBase):