Can't control a GUI pushbutton by numeric keypad.

Hi,

I have a pushbutton added in my MATLAB GUI. I want it to be pressed when using a numeric keypad.

It works when using a keyboard, but I need it to work when using a numeric keypad.

Can anyone help?

function varargout = gui(varargin)
% GUI MATLAB code for gui.fig
%      GUI, by itself, creates a new GUI or raises the existing
%      singleton*.
%
%      H = GUI returns the handle to a new GUI or the handle to
%      the existing singleton*.
%
%      GUI('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in GUI.M with the given input arguments.
%
%      GUI('Property','Value',...) creates a new GUI or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before gui_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to gui_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help gui

% Last Modified by GUIDE v2.5 25-Feb-2019 22:11:28

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @gui_OpeningFcn, ...
                   'gui_OutputFcn',  @gui_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before gui is made visible.
function gui_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to gui (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes gui wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = gui_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;



% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
NET.addAssembly('System.Speech');
obj = System.Speech.Synthesis.SpeechSynthesizer;
obj.Volume = 100;
Speak(obj, 'ten');

% --- Executes on key press with focus on figure1 or any of its controls.
function figure1_WindowKeyPressFcn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  structure with the following fields (see MATLAB.UI.FIGURE)
%	Key: name of the key that was pressed, in lower case
%	Character: character interpretation of the key(s) that was pressed
%	Modifier: name(s) of the modifier key(s) (i.e., control, shift) pressed
% handles    structure with handles and user data (see GUIDATA)
keyPressed = eventdata.Key;
switch eventdata.Key
    case '1'
          pushbutton1_Callback(handles.pushbutton1,[],handles);
 end

Answer 1

[Rahul]

Hi @Chung Ning Wang,

In order to achieve the desired functionality of controlling a GUI Pushbutton with a numeric keypad keypress, consider usinhg a keyPressCallback function which is assigned to the 'KeyPressFcn' of the figure/GUI. Here is an example:

function myGui

    hFig = figure('Name', 'My GUI', 'NumberTitle', 'off', 'KeyPressFcn', @keyPressCallback);

    hButton = uicontrol('Style', 'pushbutton', 'String', 'Press Me',
                        'Callback', @buttonCallback);

    % Callback function for key press
    function keyPressCallback(~, event)
        % Check if the pressed key is from the numeric keypad
        if isnumeric(str2double(event.Key))
            buttonCallback(hButton, []);
        end
    end

    % Callback function for the pushbutton
    function buttonCallback(~, ~)
        disp('Button Pressed!');
    end
end

myGui

I used the following steps:

• Adding a 'keyPressCallback' as a 'KeyPressFcn' in the figure.
• Defining a button using 'uicontrol' with a 'Callback' function. This step enables a mouse click to also be registered as a valid click. User can remove this 'Callback' if only keypad click is required to be considered.
• 'keyPressCallback' registers the keypad input and checks if it is from a numeric keypad key, then further calls the 'buttonCallback'.

The following MATLAB Answers can be referred:

https://www.mathworks.com/matlabcentral/answers/12034-gui-button-with-keyboard-shortcut

https://www.mathworks.com/matlabcentral/answers/179574-how-can-we-control-push-button-in-matlab-gui-by-keyboard-instead-of-mouse-click

The following MathWorks documentations can be referred to know more:

'KeyPressFCN': https://www.mathworks.com/help/matlab/ref/matlab.ui.figure-properties.html#buiwuyk-1-KeyPressFcn

'uicontrol': https://www.mathworks.com/help/matlab/ref/uicontrol.html

'str2double': https://www.mathworks.com/help/matlab/ref/str2double.html

'isnumeric': https://www.mathworks.com/help/matlab/ref/isnumeric.html

Thanks.