How to wait for a button to be pressed?

Question

Oliver Lestrange 2020-8-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/583082-how-to-wait-for-a-button-to-be-pressed

回答： Image Analyst 2020-8-22

采纳的回答： Image Analyst

在 MATLAB Online 中打开

Hi,

I have the following code:

% --- Executes on button press in insertAntenna.
function insertAntenna_Callback(hObject, eventdata, handles)
% hObject    handle to insertAntenna (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Coloca a antena nas coordenadas seleccionadas pelo ginput %
handles  = guidata(hObject)
[x_gNB, y_gNB] = ginput(1);
handles.nAntena = handles.nAntena + 1
Antena_x = x_gNB;
Antena_y = y_gNB;
rectangle('Position', [(Antena_x - handles.Rwidth/2) (Antena_y - handles.Rheight/2)...
    handles.Rwidth handles.Rheight], 'FaceColor', 'r','LineStyle', 'none');
uiwait(waitfor(sectorAngle_Button_Callback(hObject, eventdata, handles)));    % Wait for the respective sector
handles.Antena(handles.nAntena).Antena_x = Antena_x;
handles.Antena(handles.nAntena).Antena_y = Antena_y;
handles.Antena(handles.nAntena).Info = handles.Antena(1).Info;
handles.Antena(handles.nAntena).Altura = handles.Antena_Altura;
handles.Antena(handles.nAntena).Direction = handles.AntenaDirection;
guidata(hObject, handles)
% --------------------------------------------------------------------------------------------------------------------------
% --- Executes on selection change in sectorAngle.
function sectorAngle_Callback(hObject, eventdata, handles)
% hObject    handle to sectorAngle (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hints: contents = cellstr(get(hObject,'String')) returns sectorAngle contents as cell array
%        contents{get(hObject,'Value')} returns selected item from sectorAngle
contents = cellstr(get(hObject,'String'))   % Options of popupmenu 
selected = contents{get(hObject,'Value')}   % Value selected by the user through popupmenu 
if strcmp(selected,'Sector1')
    handles.AntenaDirection = 300;
elseif strcmp(selected,'Sector2')
    handles.AntenaDirection = 180;
else 
    handles.AntenaDirection = 60;
end
guidata(hObject, handles)
% --------------------------------------------------------------------------------------------------------------------------
% --- Executes during object creation, after setting all properties.
function sectorAngle_CreateFcn(hObject, eventdata, handles)
% hObject    handle to sectorAngle (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called
% Hint: popupmenu controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end
s1 = 'Sector1';
s2 = 'Sector2';
s3 = 'Sector3';
sectors = char(s1, s2, s3);
set(hObject,'string',sectors)
% --------------------------------------------------------------------------------------------------------------------------
% --- Executes on button press in sectorAngle_Button.
function sectorAngle_Button_Callback(hObject, eventdata, handles)
% hObject    handle to sectorAngle_Button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

In the line

uiwait(waitfor(sectorAngle_Button_Callback(hObject, eventdata, handles)));    % Wait for the respective sector

I want to wait for the button sectorAngle be pressed in order to handles.AntenaDirection value.

What I am doing wrong?

Thanks!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2020-8-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/583082-how-to-wait-for-a-button-to-be-pressed#answer_483560

在 MATLAB Online 中打开

Don't put that code

s1 = 'Sector1';
s2 = 'Sector2';
s3 = 'Sector3';
sectors = char(s1, s2, s3);
set(hObject,'string',sectors)

into the CreateFcn. I never put anything it there. Just leave the createfcn function alone. Put it into the sectorAngle_Button_Callback callback or your OpeningFcn function.

And don't have the uiwait(waitfor()) line of code - it's not necessary since the button is already waiting for you to click it. If you still have trouble, attach both the .fig file and .m file.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Adam Danz 2020-8-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/583082-how-to-wait-for-a-button-to-be-pressed#answer_483500

在 MATLAB Online 中打开

Place this in the line where you want execution to pause

uiwait(handles.figure1) % use your figure handle

Then, from within the button's callback function, add the line,

uiresume(handles.figure1) % use your figure handle

5 个评论
显示 3更早的评论隐藏 3更早的评论

Adam Danz 2020-8-22

编辑：Adam Danz 2020-8-22

在 MATLAB Online 中打开

That's clearer.

What is the value of selected just before the conditional statements?

It may be the case that none of your conditions are met and if the initial value is 60, that value wouldn't change.

By the way, a switch/case block is sometimes a better way to organize discrete options than if/else statements.

if swtich(lower(selected))
case 'sector1' % lowercase
    handles.AntenaDirection = 300;
case 'sector2' % lowercase
    handles.AntenaDirection = 180;
otherwise
    handles.AntenaDirection = 60;
end

Oliver Lestrange 2020-8-22

编辑：Oliver Lestrange 2020-8-22

"What is the value of selected just before the conditional statements" - Is Sector1, Sector2 or Sector3, depending of which I selected in the pop-up menu, just like is supposed to.

Thanks for the switch/case suggestion.

请先登录，再进行评论。