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From: Danny Milosavljevic <dannym@friendly-machines.com>
Date: 2026-02-13
Subject: Fix compatibility with matplotlib 3.6+
Matplotlib 3.6 removed the `message` Qt signal from NavigationToolbar2QT.
The old API was:
message = QtCore.Signal(str)
def set_message(self, s):
self.message.emit(s)
self.locLabel.setText(s)
The new API just updates the label directly with no signal:
def set_message(self, s):
self.locLabel.setText(s)
Matplotlib provides no replacement signal. The only way to intercept
toolbar messages is to override the set_message method.
This patch replaces the signal connection with a method override that
forwards messages to the status bar.
--- a/src/mslice/plotting/plot_window/plot_window.py
+++ b/src/mslice/plotting/plot_window/plot_window.py
@@ -274,7 +274,18 @@ class PlotWindow(QtWidgets.QMainWindow):
def create_status_bar(self):
self.statusbar = QtWidgets.QStatusBar(self)
- self.stock_toolbar.message.connect(self.statusbar.showMessage)
+ # Matplotlib 3.6 removed the `message` Qt signal from
+ # NavigationToolbar2QT. The old code was:
+ #
+ # self.stock_toolbar.message.connect(self.statusbar.showMessage)
+ #
+ # Since matplotlib provides no replacement signal, we override
+ # set_message to forward messages to the status bar.
+ original_set_message = self.stock_toolbar.set_message
+ def set_message_forwarding_to_statusbar(s):
+ original_set_message(s)
+ self.statusbar.showMessage(s)
+ self.stock_toolbar.set_message = set_message_forwarding_to_statusbar
self.setStatusBar(self.statusbar)
def flag_as_kept(self):
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