I faced a similar problem in the past. Assigning a 'WindowButtonDownFcn' callback to a 'uifigure' in App Designer overrides the default mouse button behaviour across the entire app window. This can interfere with built-in interactive tools like zooming and panning.
In MATLAB 2021b, the zoom interaction mode takes control of mouse event handling and suppresses 'WindowButtonDownFcn' functionality. If you want to support both your custom behaviour and the default zoom/pan functionality, you’ll need to add logic within your callback to distinguish between user interactions and decide when to execute your custom code versus letting the default behaviour proceed.
There is a possible workaround to remove the warning: “Setting the ‘WindowButtonDownFcn’ property is not permitted while this mode is active.” You can turn off any active mode before setting the callbacks for their mode. Here is a code snippet demonstrating this workaround:
function startupFcn(app, mainapp)
% setup most of the figure contents
VisualizationStartup(app, mainapp);
zoom(app.plot_tt, 'off');
% setup the function called upon click in figure
app.UIFigure.WindowButtonDownFcn = createCallbackFcn(app, @VisualizationClickOnPlot, true);
% enable zoom on plot_tt axes
zoom(app.plot_tt, 'on');
end
I hope it solves your query.
