GUI: how to call callback function from keyboard using 'windowkeypressfcn'?

Question

James Ang 2015-4-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/210241-gui-how-to-call-callback-function-from-keyboard-using-windowkeypressfcn

评论： James Ang 2015-4-19

采纳的回答： Geoff Hayes

在 MATLAB Online 中打开

Hi all,

I've pushbutton callback function as below:

function movefront_Callback(hObject, eventdata, handles)
handles.speed.String = num2str(str2double(handles.speed.String) +1);

And I would like to call this function from the keyboard, so I've this:

function figure1_WindowKeyPressFcn(hObject, eventdata, handles)
switch eventdata.Key
    case 'a'
        handles.speed.String = num2str(str2double(handles.speed.String) + 1);  
    case 'b'
        handles.speed.String = num2str(str2double(handles.speed.String) - 1);
end

The above code works but I called it directly from the handles structure. How do I call the callback function from the windowskeypress function?

e.g

switch eventdata.Key
      case 'a'
          @movefront_Callback(); %not working obviously

thanks in advance.

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Answer 1

Geoff Hayes 2015-4-18

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/210241-gui-how-to-call-callback-function-from-keyboard-using-windowkeypressfcn#answer_175778

在 MATLAB Online 中打开

James - all you need to do is to just call the callback directly and ensure that you pass the correct inputs. Since your callback signature is

function movefront_Callback(hObject, eventdata, handles)

then you need to pass the handle to the movefront control (this is hObject), the event data (which can be empty as it seems to be only valid for key presses and other events like that) and the handles structure. So your key press callback can become

 function figure1_WindowKeyPressFcn(hObject, eventdata, handles)
 switch eventdata.Key
    case 'a'
        movefront_Callback(handles.movefront, [], handles); 
    case 'b'
        moveback_Callback(handles.moveback, [], handles); 
 end