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

Question

Philipp Schulz 2021-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/858810-run-a-function-erverytime-a-new-datatip-is-selected-callbacks-for-datatips

评论： Adam Danz 2021-6-24

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

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Mario Malic 2021-6-18

See Interactivity sectíon https://ch.mathworks.com/help/matlab/ref/matlab.ui.figureappd-properties.html ButtonDownFcn probably should be the way to go. You should see examples with callbacks on uifigures/uiaxes first as it is not simple at first.

What do you mean by variable? I think you'll have to make your variable a property of the app so you can access it inside callback.

Philipp Schulz 2021-6-22

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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Answer 1

Adam Danz 2021-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/858810-run-a-function-erverytime-a-new-datatip-is-selected-callbacks-for-datatips#answer_730595

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).

ButtonDownFcn to datatip
ButtonDownFcn to pseudo-datatip that return values (go to method #5)

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Philipp Schulz 2021-6-24

Hello Adam,

thank you for this detailed answer. This helpeld me a lot solving my problem.

I have one more question. Once I enable datacursormode, my graph doesn't display datatips while hovering over them. This was working before activating datacursormode.

Is there a solution to it?

Adam Danz 2021-6-24

Perhaps these threads may be helpful:

Image in uiaxes

Data tips in app designer

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

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