Regarding the GUI update to change the slider values.

Dear Friends Hello,

I have a querry I request to please help.

I have created a GUI where the values is gratting is selected from the 'select_gratting' as shownin attached figure. I want to change the slider limits based on gratting selected. For example currently it shows - 30 to 550 for 1200 gratting values, but when 2400 gratting selected I want slider limit to change and show 30 to 250 without closing the GUI.

I request to please help, how can I do this.

Thanking you,

Kind regards

Answer 1

[Voss]

Assuming app.dropdown is your dropdown component and app.slider is your slider component:

if app.dropdown.ValueIndex == 1
    app.slider.Limits = [30 550];
else
    app.slider.Limits = [30 250];
end

[Paramjit Yadav]

Dear @Voss

Thank you so much for replying.

I did not develope GUI using app, but used normal matlab commands. I used as follows-

Can you please suggets what should I do in it. Here, obj.wavelength_limits is slider limits.

obj.gratting = uidropdown(allgrid,"Items",["1200/mm","2400/mm"],'FontSize', fontgr,"ValueChangedFcn", @grating_Call);
obj.gratting.Layout.Row = 1;
obj.gratting.Layout.Column = [3];



function grating_Call(src,event)
if strcmp(obj.gratting.Value, '1200/mm')
    obj.wavelength_limits = [30,550];
    
else strcmp(obj.gratting.Value, '2400/mm')
    obj.wavelength_limits = [30,250];
end
end

[Voss]

I assume that obj.wavelength is the slider component.

obj.gratting = uidropdown(allgrid,"Items",["1200/mm","2400/mm"],'FontSize', fontgr,"ValueChangedFcn", {@grating_Call,obj});
obj.gratting.Layout.Row = 1;
obj.gratting.Layout.Column = [3];



function grating_Call(src,event,obj)
if strcmp(src.Value,'1200/mm')
    obj.wavelength.Limits = [30,550];
else
    obj.wavelength.Limits = [30,250];
end
end

[Paramjit Yadav]

Dear @Voss

I tried using the code u provided but it didnot work. Regarding the slider how I created it I have attached. code for slider created and its calling function. I request to please help by giving it a look and help me to correct. I will be very thankfull to you.

Kind regards

obj.wavelength_limits = [30,550];
%% slider
fontgr = 17;
obj.UI.slider_1 = uislider(allgrid, "Limits", obj.wavelength_limits, 'Value', obj.approach_wl, "ValueChangedFcn", @approach_wlCall,  'FontSize', fontgr);
obj.UI.slider_1.Layout.Row = 3;
obj.UI.slider_1.Layout.Column = [1,5];
%obj.UI.slider_1.FontSize = fontgr;

%% editfield
fontgr = 18;
obj.UI.approach_wl = uieditfield(allgrid,'numeric', "Limits", obj.wavelength_limits, 'Value', obj.approach_wl, "ValueDisplayFormat", "%.3f nm", 'FontSize', fontgr, "ValueChangedFcn", @approach_wlCall);
obj.UI.approach_wl.Layout.Row = 2;
obj.UI.approach_wl.Layout.Column = 3;

function approach_wlCall(src,event)
    obj.approach_wl = event.Value;
end



%% dropdown
obj.gratting = uidropdown(allgrid,"Items",["1200/mm","2400/mm"],'FontSize', fontgr,"ValueChangedFcn", @grating_Call);
obj.gratting.Layout.Row = 1;
obj.gratting.Layout.Column = [3];
function grating_Call(src,event)
if strcmp(obj.gratting.Value, '1200/mm')
    obj.wavelength_limits = [30,550];
    
else strcmp(obj.gratting.Value, '2400/mm')
    obj.wavelength_limits = [30,250];
end
end

[Voss]

If you want to store things in the obj structure and have them update in component callbacks, the easiest way to do that is to have the callbacks be nested inside a main function, as in the following example:

function GUI()

f = uifigure();
allgrid = uigridlayout(f);

obj.approach_wl = 100;

obj.wavelength_limits = [30,550];

%% slider
fontgr = 17;
obj.UI.slider_1 = uislider(allgrid, "Limits", obj.wavelength_limits, 'Value', obj.approach_wl, "ValueChangedFcn", @approach_wlCall,  'FontSize', fontgr);
obj.UI.slider_1.Layout.Row = 3;
obj.UI.slider_1.Layout.Column = [1,5];
%obj.UI.slider_1.FontSize = fontgr;

%% editfield
fontgr = 18;
obj.UI.approach_wl = uieditfield(allgrid,'numeric', "Limits", obj.wavelength_limits, 'Value', obj.approach_wl, "ValueDisplayFormat", "%.3f nm", 'FontSize', fontgr, "ValueChangedFcn", @approach_wlCall);
obj.UI.approach_wl.Layout.Row = 2;
obj.UI.approach_wl.Layout.Column = 3;

%% dropdown
obj.gratting = uidropdown(allgrid,"Items",["1200/mm","2400/mm"],'FontSize', fontgr,"ValueChangedFcn", @grating_Call);
obj.gratting.Layout.Row = 1;
obj.gratting.Layout.Column = [3];


function approach_wlCall(src,event)
    obj.approach_wl = event.Value;
end


function grating_Call(src,event)
if strcmp(obj.gratting.Value, '1200/mm')
    obj.wavelength_limits = [30,550];
else
    obj.wavelength_limits = [30,250];
end
obj.UI.slider_1.Limits = obj.wavelength_limits;
end

end

[Paramjit Yadav]

Dear @Voss

Thank you so much for help. It worked. Cheers.

Kind regards

[Voss]

You're welcome!