"Next Button" and "command window" in App Designer

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I am very new to Matlab App designer and have two questions. I appreciate any help.
  1. I have a series of images located in a folder. I would like to show them one at a time and then go to the next one by pressing the "Next" button. How can I program the "Next" button?
  2. I would like to see the values of variables in AppDesigner code. I know it's doable via debug mode and placing a break point at the line in which that variable is. But I don't see the values by hovering the mouse (although this feature is active in normal Matlab mode). Also, I don't really know where is the command window for App designer mode? I think it's not the same as Matlab command window because when I put variable's name there, it's undefined.
Thank you for any help
  4 Comments
Vaishnavi
Vaishnavi on 19 May 2021
Edited: Vaishnavi on 19 May 2021
I have recently started learning app designer.
I have similar question.
I want to design an app. I has 3 buttons load next and previous.
Load button will load 1st image from folder which contains many images and next and previous button will load next or previous image to image which is already in image component.
Mohammad Sami
Mohammad Sami on 20 May 2021
You can adapt the below code. Add a new function load previous as follows. You can then link it to your button callbacks.
function load_previous_image(app)
idx = app.currentidx - 1;
if idx == 0
idx = 1;
end
app.load_image_at_index(idx);
end

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Accepted Answer

Mohammad Sami
Mohammad Sami on 7 Apr 2020
Edited: Mohammad Sami on 7 Apr 2020
Make an app and add two properties. Filelist and currentidx and a placeholder for image in the app.
Make a function called load next image. Set it as the callback for your next button.
On startup load the filelist and display the first image.
properties (Access = private)
currentidx = 1; %set to 1 initially
Filelist = {};
end
function load_next_image(app)
idx = mod(app.currentidx + 1,length(app.Filelist));
if idx == 0
idx = 1;
end
app.load_image_at_index(idx);
end
function load_image_at_index(app,j)
app.currentidx = j;
impath = app.Filelist{j};
app.Image.ImageSource = impath;
end
% add a startup function by clicking AppInputArguments button in code view
function startupFcn(app,varargin)
% app.Filelist = {'C:\test\test.png'}; % assign your list
app.load_image_at_index(1);
end
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