更新Matlab gui的所有组件（使用指南创建）

Question

My Matlab GUI is a form with many text fields that are initially populated using the same data struct. Each text field has a callback and a create function, where the text field is assigned the value of the given struct. However, at some later point I would like to repopulate the form using a different struct, as an event triggered by pressing a push button. The code looks approximately like:

h = MyFigure;
global mystruct

mystruct = somevalues;

handles = guidata(h);

set( handles.textfield1, 'String', mystruct.value1 )
...
set( handles.textfieldN, 'String', mystruct.valueN )

However, if I could make Matlab call all these callbacks recursively (like a "validate tree" function), I wouldn't have to call "set" for each text field. I have tried refresh(h) and drawnow(), with no luck.

Now my question is whether or not there is such a function built into the matlab guide framework?

Answer 1

When you set a property of a handle like set(h,'String',str) , the value of str is copied. It is not a reference to that variable that can be updated automatically. Your best bet is to make a subroutine called updateText or something like that, put all of the set statements in it, and call it when needed.

Calling guidata(hObject, handles); is only for updating the GUI with modifications to handles . You may need this elsewhere, but for the job of updating properties of certain handle graphics objects, it is not really used.

---

One possibility is to create a timer to update the text fields on a regular basis. In your GUI's opening function, create a timer that defines an update function to run periodically:

T = timer('Period',1,'StartDelay',0.5,'TimerFcn', ...
          {@updateTextBoxes,handles},'ExecutionMode','FixedRate');
start(T)

The update function would look like:

function updateTextBoxes(hTimerObj, timerEvent, handles)
global mystruct
% get mystruct data however you do it...
% maybe also get handles via handles=guidata(hTimerObj); instead of input
set( handles.textfield1, 'String', mystruct.value1 )
...
set( handles.textfieldN, 'String', mystruct.valueN )

EDIT : Do NOT forget to delete the timer ( delete(T) ) or stop it before you quit the GUI or do clear T , otherwise it will just keep running and you will have to quit MATLAB... No, I did not just do this myself!

Answer 2

You need to update the handles structure with this :

% Update handles structure
guidata(hObject, handles);