MATLAB: How to create a listbox with a scrollbar starting at the bottom of the listbox, when using GUIDE in MATLAB

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How do I create a listbox with a scrollbar starting point at the bottom of a listbox, when using GUIDE in MATLAB?

I have a listbox in my GUI, and I would like the starting point of the scrollbar to be at the bottom of the list when the GUI is activated.

Best Answer

One way to have the scroll bar begin at the bottom of the Listbox is to set the 'Value' property of the Listbox to the number of elements in the list through the Property Inspector. The Property Inspector is a separate user interface that can be found as one of the menu items when right-clicking on the Listbox when designing the GUI. For example, if you have 6 elements choices in a list, setting the 'Value' property of the Listbox to '6' displays the starting point of the scroll bar at the bottom of the Listbox.

An alternative way to set the position of the scroll bar is to use the commands set(handles.listbox1,'Value',x) or set(handles.listbox1,'ListboxTop',x) in the Callback function, where x is the index of the last list item in the Listbox. For example,

set(handles.listbox1,'String',data); %populate the list with data

index = size(get(handles.listbox1,'string'), 1); %get how many items are in the list box

set(handles.listbox1,'ListboxTop',index); %set the index of last item to be the index of the top-most string displayed in list box.

set(handles.listbox1,'Value',index);

When setting the 'Value' parameter, the last element in the list gets highlighted. On the other hand, setting the 'ListboxTop' parameter does not highlight the last element in the Listbox.

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MATLAB: GUI listbox

strings = get(hObject, 'string');
curval = get(hObject, 'value');
if iscell(strings)
  curstring = strings{curval};
else
  curstring = strings(curval, :);  %char array
end

Whether the string parameter is a cell array of strings, or a char array, depends on exactly how the listbox was initialized. If it was initialized to a single string that did not have any '|' characters, or initialized to a char array, then a char array will be the result, but if it was initialized to a cell array of strings, or to a single string that had on or more '|' characters, then a cell array will be the result.

MATLAB: How to reset toggle buttons with a push button

push buttton callback:

set(handles.togglebutton1,'value',0);
set(handles.togglebutton2,'value',0);

Best Answer

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