"Next Button" and "command window" in App Designer
显示 更早的评论
I am very new to Matlab App designer and have two questions. I appreciate any help.
- 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?
- 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 个评论
Mohammad Sami
2020-4-7
In debug mode, you should be able to access the variables in the "function workspace" from the command window as any other code in debug mode.
WhiteFlower
2020-4-7
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
2021-5-20
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
采纳的回答
Mohammad Sami
2020-4-7
编辑：Mohammad Sami
2020-4-7
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
8 个评论
WhiteFlower
2020-4-7
Tommy
2020-4-7
This first bit:
properties (Access = private)
currentidx = 1; %set to 1 initially
Filelist = {};
end
should not be within any other function. There should already be a section labeled 'properties' in your code, near the top, underneath the classdef, similar to this:
classdef app1 < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
end
Add the first bit underneath this section:
classdef app1 < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
end
properties (Access = private)
currentidx = 1; %set to 1 initially
Filelist = {};
end
Now app, an instance of your app, contains the properties currentidx and Filelist, and you can access them anywhere that you can access app by using app.currentidx or app.Filelist.
The second bit:
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
should replace your NextButtonPushed function. Rename it to NextButtonPushed if you want.
The fourth bit:
function startupFcn(app,varargin)
% app.Filelist = {'C:\test\test.png'}; % assign your list
app.load_image_at_index(1);
end
is just a function that gets called whenever the app starts. The above code will automatically load the first image. For instructions on how to add the startupFcn, see here.
WhiteFlower
2020-4-8
Mohammad Sami
2020-4-9
Thanks Tommy for adding detailed explanation.
WhiteFlower
2020-4-13
Mohammad Sami
2020-4-14
uiimage component was added in R2019a
WhiteFlower
2020-4-14
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Develop Apps Using App Designer 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
