How do I set the string of an edit text using a slider and vise versa?

My current code for the edit text is:

set(handles.edit1, 'String', num2str(get(handles.slider1, 'Value')));

What I need the slider to do is display the value of the slider and also have the edit text be able to set the slider.

Answer 1

[Geoff Hayes]

Giann - in order to display the slider value in the edit text widget, you will need a callback. For sliders, a continuous value change listener can be used to handle this callback. Assuming that you are using GUIDE, in the opening function of your GUI, do the following

 function yourGuiName_OpeningFcn(hObject, eventdata, handles, varargin)

 % Choose default command line output for untitled
 handles.output = hObject;

 % create the listener for the slider
 handles.sliderListener = addlistener(handles.slider1,'ContinuousValueChange', ...
                                      @(hObject, event) slider1ContValCallback(...
                                        hObject, eventdata, handles));

 % default the edit text to the min slider value
 set(handles.edit1, 'String', num2str(get(handles.slider1,'Min')));

 set(handles.edit1, 'String', num2str(0));

 % update handles structure
 guidata(hObject, handles);

All we are doing is setting up the continuous value change callback for the slider, and setting the listener object as a field value within the handles structure. guidata then saves the updated handles structure. We also initialize the edit text value to be the minimum slider value.

Now we define the slider1ContValCallback callback using your code from above

 function slider1ContValCallback(hObject, eventdata, handles)

 set(handles.edit1, 'String', num2str(get(handles.slider1, 'Value')));

That part is easy. More challenging is going in the other direction. Look at the KeyPressFcn callback for the edit text widget, and start from there.

[Giann Geocadin]

So after some testing, I have four that the line of code I had updates the text, but only after I hit enter within the box. Is there any way that I could have it continuously update?

[Geoff Hayes]

What code have you written to update from the edit box to the slider? Have you added sufficient logic to handle non-numerical data and numerical data that falls outside of the min and max values for the slider?

[Kiran Reddy]

_what you said i understood, but how to get that updated value of the edit text without using editcallback( i mean to ask without clicking in the box how to update the value to work space when your using only the slider control to update the value of in the edit text)and viceverse _this is because when you want give this output either of them to the input in other function

[Geoff Hayes]

Kiran - I'm not all that clear on your question. If you update the edit text box with a string value as

 set(handles.edit1, 'String', num2str(get(handles.slider1, 'Value')));

then in any other callback you can get that numeric value using get as

 str2num(char(get(handles.edit1, 'String')));

[Kiran Reddy]

</matlabcentral/answers/uploaded_files/39681/mathworks.jpg> sorry for not being clear about my question see the image this my gui slider is one which updates the value in the text . this the code

function edit1_Callback(hObject, eventdata, handles)
set(handles.slider1, 'Value', str2num(get(handles.edit1, 'String')))
% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)

set(handles.edit1, 'String', get(hObject,'Value'));

i need updated information from either of the callbacks to transfer to some other function where i can do desired analysis(like Run result callback) ...for example as show in figure i need the update value in figure temperature edit text (the value can be directly enter into edit box which initates edit callback or by moving slider which initiated slider call back) ,,,i used setappdata function to transfer the data to other function this means i need use to two setappdata commands(diferent handles) which are acquired by getappadata in other function if do so i will create two duplicate values which is not desirable ..

finally what am trying to say ....i need to transfer the updated value in the edit text to someother function (updated value can done either directly entering the value or by using slider ....if use get function to get from edit box then it will transfer only data which is directly entire in the edit box by edit callback and not the value by using slider ...if i use get function in slider it will not transfer the data which is directly entered in the box.)

[Geoff Hayes]

Discussion continued at http://www.mathworks.com/matlabcentral/answers/252632-matlab-gui-sider-with-edit-text.

@Kiran - please don't post the same question in separate threads.

Answer 2

[Joakim Magnusson]

If you want the edit box to update while the slider is being moved you should do as Geoff said. The solution is more simple if it's enough that the edit box updates when the slider is released. Then you could just do the following:

In the callback for the edit box, just write: set(handles.slider, 'Value', str2num(get(handles.editTextBox, 'String')));

In the sliders callback write: set(handles.editTextBox, 'String', get(hObject,'Value'));