May add a listener to ButtonDownFcn/ButtonUpFcn ? I tried various events but only got errors like:

Event 'ButtonDownFcn' is not defined for class
'matlab.ui.control.UIControl'.

I have some performance issues when using the addlistener in addition to WindowButtonMotionFcn:

function temp
   F = figure();
   set(F,'WindowButtonMotionFcn',@Cursor);
   H = uicontrol(F,'Style','slider');
   addlistener(H, 'Value', 'PostSet',@getSliderValue);
end
function getSliderValue(hObj,event)
   get(event.AffectedObject,'Value')
end
function Cursor(hObj,event)
   disp('move')
end

Is there a way to suppress the WindowButtonMotionFcn of the figure during the continuous slider callback? I tried using the WindowButtonDownFcn/WindowButtonUpFcn to remove/add the WindowButtonMotionFcn, but WindowButtonDownFcn nor ButtonDownFcn is called when the slider property ‘Enable’ is set ‘on’. Using ‘inactive’ first would a require a second click to tell Matlab to drag the slider…

function temp
   F = figure();
   set(F,'WindowButtonMotionFcn',@Cursor);
   set(F,'WindowButtonDownFcn',@ButtonDown);
   set(F,'WindowButtonUpFcn',@ButtonUp);
   H = uicontrol(F,'Style','slider');
   addlistener(H, 'Value', 'PostSet',@getSliderValue);
end
function getSliderValue(hObj,event)
   get(event.AffectedObject,'Value')
end
function Cursor(hObj,event)
   disp('move')
end
function ButtonDown(hObj,event)
   set(gcf,'WindowButtonMotionFcn',[]);
end
function ButtonUp(hObj,event)
   set(gcf,'WindowButtonMotionFcn',@Cursor);
end

Thanks, Felix

Thanks Seif – I clarified the post text accordingly.

hProp = findprop(hSlider,'Value');
hListener = addlistener(hSlider,hProp,'PostSet',@myCbFcn);
setappdata(hSlider,'sliderListener',hListener);

Cordially.

kind regards

@Daniel – this is one of the reasons that I use try/catch rather than if/else

Yes! Fewh, my code will still works with some changes.

Actually, my code was written defensively, checking explicitly that ‘ContinuousValueChange’ is in the list of events in a handle… the result is that the code refuses to create the listener to an apparently non available-event.

Thanks for pointing me to your list of events in HG2: it is the only source of information I can use to harness events!

… I really wonder why TMW has hidden these events: I don’t see any advantage, and it makes life much harder…

@Daniel – the ContinuousValueChange event still exists. It is simply hidden, but should be fully functional:

addlistener(hSlider, 'ContinuousValueChange', @(h,e)disp('Changing!'))

Other hidden events of sliders include: Action, KeyPress, KeyRelease, LocationChanged, SizeChanged, ButtonDown, Reset

Additional information: http://undocumentedmatlab.com/blog/undocumented-hg2-graphics-events

That’s a pity, I had many code based in this approach, which is know perfectly useless :-/

@Amindo – perhaps ScrollPlot on the File Exchange will help you. If not, then contact me offline (by email) for a a consulting proposal.