How to autoscroll slider in this case using pushbutton?

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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?

Accepted Answer

Geoff Hayes
Geoff Hayes on 9 Jun 2022
@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).

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