How to autoscroll slider in this case using pushbutton?

Example: (Here I am enclosing the another example. When we use slider it changes the images. I wanted to insert a button that can automatically move the slider.)

I have created GUI which has slider . When Slider moves manually it will show images from the folder. But now I wanted to add a pushbutton which can automate the slider function. Can you give some idea for this?

Answer 1

[Geoff Hayes]

@Swetha C - you may want to nest your code within a main function so that you don't have to use the @doc:guidata which may not be appropriate for your GUI (i.e. might not always work). This would mean your code becomes

%Load an example image
function untitled5
    a=imread('matlab.jpg');
    %Replicate 100 times
    database=repmat(a,1,1,100);
    N_images=size(database,3);
    %prepare figure and guidata struct
    h=struct;
    h.f=figure;
    h.ax=axes('Parent',h.f,...
        'Units','Normalized',...
        'Position',[0.1 0.1 0.6 0.8]);
    h.slider=uicontrol('Parent',h.f,...
        'Units','Normalized',...
        'Position',[0.8 0.1 0.1 0.8],...
        'Style','Slider',...
        'BackgroundColor',[1 1 1],...
        'Min',1,'Max',N_images,'Value',1,...
        'Callback',@sliderCallback);
    
    %store image database to the guidata struct as well
    h.database=database;

    %trigger a callback
    sliderCallback(h.slider)

    function sliderCallback(hObject,eventdata)
        count=round(get(hObject,'Value'));
        IM=h.database(:,:,1:count);
        IM=permute(IM,[1 2 4 3]);%montage needs the 3rd dim to be the color channel
        montage(IM,'Parent',h.ax);
    end
end

Within the above you would add the code to create the button and add its callback

    h.button=uicontrol('Parent',h.f,...
        'Units','Normalized',...
        'Position',[0.8 0.1 0.1 0.1],...
        'Style','pushbutton',...
        'BackgroundColor',[1 1 1],...
        'String', 'Next image', ...
        'Callback',@buttonCallback);

    function buttonCallback(hObject,eventdata)
        % get the current slider value
        sliderValue = get(h.slider, 'Value');
        % if slider value is less than the maximum, then we can increment
        if sliderValue < (get(h.slider, 'Max') - get(h.slider, 'Min'))
            % update the slider
            set(h.slider, 'Value', sliderValue + 1);
            drawnow;
            % call the slider callback
            sliderCallback(h.slider, []);
        end
    end

You would have similar code to go in the other direction (i.e. previous image).