MATLAB: Does uiimage prevent underlying uifigure mouse button callbacks to trigger

appdesignercallbacksMATLABuiaxesuifigureuiimage

Hello there,

I am using MATLAB R2019b.

Contrary to uiaxes, it seems that uiimage will prevent any mouse button callbacks (WindowButtonDownFcn, WindowButtonUpFcn and WindowButtonMotionFcn) of the parent figure to trigger.

Example:

Below in my application, I have a superposition of an uifigure (grey array), uiaxes (white area) and uiiimage (map). When I click on the grey or white areas, the WindowButton callbacks are correctly triggered. This is not the case when I click on the map. This annoys me for my current application !! 🙂

Note that WindowScrollWHeelFcn is correctly triggered when scrolling on the uiimage object.

I suppose this comes from the fact that uiimage objects are also listening for clicks to trigger their own callback (ImageClickedFcn), contrary to UIaxes objects which do not have any callback properties. I have tried not defining any ImageClickedFcn and unchecking the interruptible property of the uiimage without success.

I suppose there is no workaround? This is sad because uiimage was quite the solution to the problems I had in my current application when using uiaxes … 😉

Nevermind and thanks for your help !

Best Answer

I found a workaround with mlapptools : https://undocumentedmatlab.com/blog/matlab-callbacks-for-uifigure-javascript-events.

I hope that uiimage will get more callbacks in the future to propose more possible interactions ! :)

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Hi,

Folllowing is the code and app design

classdef app1 < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure  matlab.ui.Figure
        UIAxes    matlab.ui.control.UIAxes
        UIAxes2   matlab.ui.control.UIAxes
        Button    matlab.ui.control.Button
    end
    
    properties (Access = public)
        cam;
    end
    
    % Callbacks that handle component events
    methods (Access = private)
        % Code that executes after component creation
        function startupFcn(app)
            app.UIAxes2.Visible = 'off';
            evalin("base", 'clear cam');
            app.cam = webcam;
            frame = snapshot(app.cam);
            im = image(app.UIAxes, zeros(size(frame), 'uint8'));
            axis(app.UIAxes, 'image');
            preview(app.cam, im);
        end
        % Button pushed function: Button
        function ButtonPushed(app, event)
            img = snapshot(app.cam);
            image(app.UIAxes2, img);
            app.UIAxes2.Visible = 'off';
        end
    end
    % Component initialization
    methods (Access = private)
        % Create UIFigure and components

        function createComponents(app)
            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'UI Figure';
            % Create UIAxes
            app.UIAxes = uiaxes(app.UIFigure);
            title(app.UIAxes, 'Title')
            xlabel(app.UIAxes, 'X')
            ylabel(app.UIAxes, 'Y')
            app.UIAxes.Position = [26 270 300 185];
            % Create UIAxes2
            app.UIAxes2 = uiaxes(app.UIFigure);
            title(app.UIAxes2, 'Title')
            xlabel(app.UIAxes2, 'X')
            ylabel(app.UIAxes2, 'Y')
            app.UIAxes2.Position = [25 43 300 185];
            % Create Button
            app.Button = uibutton(app.UIFigure, 'push');
            app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
            app.Button.Position = [447 249 100 22];
            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
    % App creation and deletion
    methods (Access = public)
        % Construct app
        function app = app1
            % Create UIFigure and components
            createComponents(app)
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            % Execute the startup function
            runStartupFcn(app, @startupFcn)
            if nargout == 0
                clear app
            end
        end
        % Code that executes before app deletion
        function delete(app)
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

Error you are facing instantiates that the code is not able to access the camera object at that instant.

Hope it helps!!

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