MATLAB: How to add a graphics object callback subfunction to a GUI MATLAB program using GUIDE in MATLAB

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I want to add a graphics object callback subfunction, such as 'ButtonDownFcn', to my GUI MATLAB program using GUIDE.

Best Answer

Graphics objects can have additional callback routines like ButtonDownFcn, CreateFcn, and DeleteFcn, which are executed with the appropriate user action.

Figures can also have the following callbacks:

CloseRequestFcn

KeyPressFcn

ResizeFcn

WindowButtonDownFcn

WindowButtonMotionFcn

WindowButtonUpFcn

To add a callback subfunction to the MATLAB program:

1. Click the right mouse button while the object is selected to display the Layout Editor context menu

2. Select View Callbacks

3. Select the desired callback from the context menu

GUIDE then adds the subfunction stub to the MATLAB program file for the GUI.

For more information on this, visit the following documentation page on our web site:

 <http://www.mathworks.com/access/helpdesk/help/techdoc/creating_guis/f10-1005070.html#f10-999362>

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MATLAB: How to make a push button respond to clicking with the right mouse button

There are two properties which can be used in conjunction to accomplish this.

One is the button's 'ButtonDownFcn' callback function. This callback function executes when pressing a mouse button on or near a UICONTROL object -- including when pressing the right mouse button.

The other property is the figure's 'SelectionType' property. This property indicates which kind of click was registered in the figure window -- including clicks on controls within the figure.

Putting these two together, you can define a 'ButtonDownFcn' callback for a push button which checks the figure's 'SelectionType' property to detect a right-click. An example is shown below. (In that example, the ANCESTOR function is used to get the figure's handle. If this is being done in a GUIDE-created GUI, this is unnecessary as the 'handles' structure already provides access to the figure's handle.)

function test
      uicontrol('Style', 'pushbutton', ...
                'ButtonDownFcn', @myCallback);
end
function myCallback(src, evt)
      figHandle = ancestor(src, 'figure');
      clickType = get(figHandle, 'SelectionType');
      if strcmp(clickType, 'alt')
          disp('right click action goes here!');
      end
end

MATLAB: Drag and drop graphics

Mathworks has provided technical solution 1-4DNMFD which gives code for dragging and dropping on a single figure. It works by using the figure ButtonDownFcn, WindowButtonUpFcn, and WindowButtonMotionFcn . The Motion function is used to detect the CurrentPoint and move the object to there.

Best Answer

Related Solutions

MATLAB: How to make a push button respond to clicking with the right mouse button

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