How to pass Buttondwn function output parameter

Question

Mathew Thomas 2017-7-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/350416-how-to-pass-buttondwn-function-output-parameter

编辑： Walter Roberson 2017-7-26

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Dear All,

How can I pass an output parameter for buttondownfcn?

set(handles.b,'ButtonDownFcn', {@displayMontage, handles});
function curwell = displayMontage(src, evt, handles)
curwell = get(gco,'position');
handles = updateVisCircleColor(curwell(1), curwell(2), 'red', handles);

I want to pass "curwell" back to the initial function call. How can this be done?

Thanks,

Mathew

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Answer 1

Walter Roberson 2017-7-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/350416-how-to-pass-buttondwn-function-output-parameter#answer_275683

编辑：Walter Roberson 2017-7-26

在 MATLAB Online 中打开

If by "initial function call" you mean the call

set(handles.b,'ButtonDownFcn', {@displayMontage, handles});

that configured the callback, then the answer is that you cannot do that: that function is probably no longer running, and MATLAB does not keep track of which function or which line of code configured a particular property.

However, you could do something like,

   set(handles.b, 'ButtonDownFcn', {@displayMontage, handles}, 'UserData', []);
   waitfor(handles.b, 'UserData')
   curwell = get(handles.b, 'UserData');
function displayMontage(src, evt, handles)
  curwell = get(gco,'position');
  handles = updateVisCircleColor(curwell(1), curwell(2), 'red', handles);
  set(src, 'UserData', curwell);