How to have slider gui only return after button push?

Hi all! I created a function to create a interactive dual slide image thresholder based on an upper and lower grayscale limit. I want the upper and lower limits to return to the .m file after a pushbutton is pushed. Right now its just returing the default values, and not waiting for the pushbutton to work. Any ideas for how I can get it to wait for the user to define when to return the values of interest?

function [x, y, buttonPush] = slideThresh(photo)
sThresh = photo;
FigH = figure('Position', [ 0 0 700 800 ]);
axes1 = axes('Position', [.125 0 .75 .75]);
imshow(sThresh, 'Parent', axes1);
leaveMe = uicontrol('style', 'pushbutton', 'string', 'Done', 'CallBack', @buttonPushed);
% leaveMe.Callback = @buttonPushed;
% x     = linspace(0, 255, 255000);

annotation('textbox', [.423 .75 .1 .1], 'String', 'Upper Threshold', 'FitBoxToText', 'on')
annotation('textbox', [.423 .625 .1 .1], 'String', 'Lower Threshold', 'FitBoxToText', 'on')
TextH = uicontrol('style','text',...
    'position',[325 625 40 15]);
SliderH = uicontrol('style','slider','Value', 255, 'position',[50 600 600 20],...
    'min', 0, 'max', 255);
TextD = uicontrol('style','text',...
    'position',[325 525 40 15]);
SliderD = uicontrol('style','slider','Value', 0, 'position',[50 500 600 20],...
    'min', 0, 'max', 255);
addlistener(SliderH, 'Value', 'PostSet', @callbackfn);
addlistener(SliderD, 'Value', 'PostSet', @callbackfn1);
movegui(FigH, 'center')
num1 = 255;
num2 = 0;

buttonPush = 0;

    function callbackfn(source, eventdata)
        num1          = get(eventdata.AffectedObject, 'Value');
        TextH.String = num2str(num1);
        sNew  = (sThresh < num1) & (sThresh > num2);
        imshow(sNew, 'Parent', axes1);
    end
    
    function callbackfn1(source,eventdata)
        num2          = get(eventdata.AffectedObject, 'Value');
        TextD.String = num2str(num2);
        sNew  = (sThresh < num1) & (sThresh > num2);
        imshow(sNew, 'Parent', axes1);
    end

    function buttonPushed(source, event)
        buttonPush = 1; 
    end


x = get(SliderH, 'Value');
y = get(SliderD, 'Value');


end

[Adam]

doc uiwait 

should do the job, either with a paired

doc uiresume

or you may just be able to give the figure handle to the uiwait call and that will be enough so long as you explicitly call delete on the figure in your pushbutton callback.

[Adam Danz]

"How to have slider gui only return after button push?"

Instead of using a slider callback function, just use the pushbutton callback function that references the current slider value.

[Adam]

I think the initial problem is that the function simply runs to completion, creating the UI and returning its output arguments without any opportunity in the middle of that for the user to actually use the GUI.

Though I agree that, having solved that issue, it is not generally useful to have a slider callback constantly updating some variable that isn't used until you press some other button.

Using the slider callback only makes sense when you are actually doing something in response to the slider, such as updating a plot or some other UI element.