How do I implement Drag and Drop functionality in MATLAB?

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I would like to be able to drag and drop a graphic object (Eg : TEXTBOX) across a figure window.

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 12 Apr 2019
Edited: MathWorks Support Team on 12 Apr 2019
In Image Processing Toolbox, there are some functions which provides draggable object such as imrect and impoly etc.
For details, please refer the following documentation:
Also, this feature can be implemented using a combination of the Figure Properties and the graphic object properties. The figure properties to be used are:
WindowButtonUpFcn
WindowButtonMotionFcn
CurrentPoint
The property of the graphic object to be used is:
ButtonDownFcn
The following example implements drag and drop functionality for a text box that is displayed on a Figure Window. This example function is also attached as a MATLAB-file:
function drag_drop
dragging = [];
orPos = [];
f = figure('WindowButtonUpFcn',@dropObject,'units','normalized','WindowButtonMotionFcn',@moveObject);
a = annotation('textbox','position',[0.2 0.2 0.2 0.2],'String','Hello','ButtonDownFcn',@dragObject);
function dragObject(hObject,eventdata)
dragging = hObject;
orPos = get(gcf,'CurrentPoint');
end
function dropObject(hObject,eventdata)
if ~isempty(dragging)
newPos = get(gcf,'CurrentPoint');
posDiff = newPos - orPos;
set(dragging,'Position',get(dragging,'Position') + [posDiff(1:2) 0 0]);
dragging = [];
end
end
function moveObject(hObject,eventdata)
if ~isempty(dragging)
newPos = get(gcf,'CurrentPoint');
posDiff = newPos - orPos;
orPos = newPos;
set(dragging,'Position',get(dragging,'Position') + [posDiff(1:2) 0 0]);
end
end
end

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