Hi Tianyu,
MATLAB does not offer a direct built-in function to inquire about the "queue state" of a “uifigure”, but as a workaround you can attach event listeners to specific events “MovingROI”, “ROIMoved” that can serve as markers for the start and end of significant operations.
You can refer the below code snippet which features a “uilamp” function that changes colour from green (idle) to red (busy) based on the ROI's movement, using event listeners to track the start and completion of this interaction:
f = uifigure('Position', [100, 100, 400, 400]);
a1 = uiaxes(f, 'Position', [100, 100, 200, 200]);
roi = drawrectangle(a1);
uil = uilamp(f, 'Position', [20, 20, 20, 20], 'Color', 'green'); % Start as 'idle'
% Listener for starting the move
addlistener(roi, 'MovingROI', @(src, evt) set(uil, 'Color', 'red')); % Busy
% Listener for move completion
addlistener(roi, 'ROIMoved', @(src, evt) set(uil, 'Color', 'green')); % Idle
You can refer the figures shown below:
To know more about “uilamp” function and event listeners, please refer to the documentations below:
- https://www.mathworks.com/help/matlab/ref/uilamp.html
- https://www.mathworks.com/help/matlab/matlab_oop/learning-to-use-events-and-listeners.html#bu6lzcw
Hope this helps!
