MATLAB: Make UIAxes invisible/visible when stacked in App desginer..

app designerappdesignerguiinvisiblelayeredstackstackeduiaxesuistackvisible

I'm using App designer to desing an app.. I have a couple of UIAxes stacked above each other, and am trying to set ones I want to see to being visible and the others to not visible, using:

app.UIAxes.Visible = 'off';

Which works fine, but the UIAxes below remains hidden! For example if I have two axes overlapping only partially, and make the one 'on top' invisible, the one 'on top' goes, but the portion on the other axes which was hidden, remains hidden!!

Frustating problem, any solutions would be great!

Best Answer

Update: Starting in Matlab r2020b, change the stack order of UI components in App Designer using the reorder tool (see release notes).

----------------------------------------------------------------------------------------

Unfortunately uistack() is not functional with UIFigures (prior to r2020b). Here's a function you could embed in your app that will put an object on top of the UI stack. Add the function by opening the app in app designer, go to code view, select functions, and add the function by pressing the green "+" under the Code Browser. Then call the function any time an object needs to be moved to top. Unfortunately the app image will flicker during the restack as the objects are redrawn.

function uistackTop(~, appfig, obj)
% Place the UI object 'obj' on top of stack in the UIfigure 'appfig'
    
appHandles = appfig.Children;       % list all handles in app
hIdx = find(appHandles==obj);       % find index of obj in appHandles
% Create new index order of app handles
newOrder = [hIdx,setdiff(1:numel(appHandles),hIdx)]; 
% assign new stack order to app
appfig.Children = appHandles(newOrder);

Example:

appfig = app.myAppFig;  % Handle to your App figure
obj = app.UIAxes2;      % handle to the object that goes on top
uistackTop(app, appfig, obj)

Also see this answer for a function that moves a UI object to the bottom of the stack.

Related Solutions

MATLAB: Tool tip bug in App Designer

Hi,

The concerned teams have been informed of this issue in tooltips. They might be looking into it for the upcoming releases.

Hope this helps!

MATLAB: App Designer: How to use a camera in different Callbacks

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!!

Best Answer

Related Solutions

MATLAB: Tool tip bug in App Designer

MATLAB: App Designer: How to use a camera in different Callbacks

Related Question