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Run a function erverytime a new Datatip is selected (Callbacks for datatips)

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Philipp Schulz
Philipp Schulz on 17 Jun 2021
Commented: Adam Danz on 24 Jun 2021
Hello Matlab Community,
I would highly appreciate your help. I have the folowing problem:
I am creating a GUI, which is able to work with Datatips interactivly.
My goal is to create a function that run everytime a new datatip is selected. I want to do many things with that function, for exampel saving the datatips to an array or showing the last selected datapoint in the label below.
I am basicially talking about a callback for datatipselected.
That's why I am looking for a simple way to solve this. A pseudo code for this would be:
datatipselected = listener('selectingdatatips')
set(datatipselected, @run)
function run
% run code
end
  4 Comments
Philipp Schulz
Philipp Schulz on 22 Jun 2021
This is what I tried to do after understanding your first answer. I created the variable dataTips in my property.
Then I was describing the variable app.dataTips in my startup Function as:
app.dataTips = findall(groot, 'type', 'datatip'); % groot, axes handle, figure handle, any graphic object
Now my problem is to define a callback function that runs after everytime the value app.dataTips changes. This way I have the chance to save the new datatip in the end of my array of all datatips. Do you know a way to create a function as such?
This would help me out a lot

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Answers (1)

Adam Danz
Adam Danz on 22 Jun 2021
You can set the UpdateFcn of datacursormode. The function will execute every time a datatip is added. You can do anything you want within that function but you'll either need to reconstruct the original datatip or add new lines to the datatip.
Here are two demos that use custom update functions; you can run them to see how they work.
Here are demos that use custom update function to add a row of data to the datatip
Here's an example of using a ButtonDownFcn to create a datatip (use this only in cases where the option above is not supported).
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