MATLAB Answers

How do I implement Drag and Drop functionality in MATLAB?

167 views (last 30 days)
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
  2 Comments
Abhishek Pandey
Abhishek Pandey on 6 Jun 2016
Hi Mariana,
If you still need help with this, I would recommend contacting MathWorks Technical Support.
- Abhishek

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!