Regarding the GUI update to change the slider values.

Question

Paramjit Yadav 2024-7-24，17:22

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https://ww2.mathworks.cn/matlabcentral/answers/2139941-regarding-the-gui-update-to-change-the-slider-values

评论： Voss 2024-7-26，13:59

采纳的回答： Voss

grating.png

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

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Answer 1

Voss 2024-7-24，18:10

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https://ww2.mathworks.cn/matlabcentral/answers/2139941-regarding-the-gui-update-to-change-the-slider-values#answer_1490076

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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

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Paramjit Yadav 2024-7-25，9:31

在 MATLAB Online 中打开

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 2024-7-25，14:56

在 MATLAB Online 中打开

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