ListBoxTop property not updating displayed listbox line

Question

Matthew Lang 2012-4-16

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35649-listboxtop-property-not-updating-displayed-listbox-line

I've seen several other users in the past that had issues w/ listboxes & viewing the bottom-most data. Usually the answers include using the 'ListBoxTop' property, which should be the correct answer. But I don't find any code snippets that actually work (and I don't want to put my hands into the java guts w/ undocumented properties unless absolutely necessary). So, here's the gauntlet once and for all...why doesn't this code display the bottom line of the listbox?

function ListboxTester_01
fh = figure('MenuBar','none',...
  'NumberTitle','off',...
  'Position',[200 200 170 100],...
  'Name','ListboxTester');
cwh = uicontrol(fh,...
  'Style','edit',...
  'Max',4,...
  'Position',[10 40 150 50],...
  'HorizontalAlignment','left',...
  'SelectionHighlight','of',...
  'HitTest','off');
uicontrol(fh,...
  'Style','pushbutton',...
  'String','test',...
  'Position',[10 10 150 20],...
  'Callback',@testbutton_callback);
ii=1;
  function testbutton_callback(~,~)
      inputstring = sprintf('Testing%d',ii);
      cwhstring = get(cwh,'String');
      newtext = cell(length(cwhstring)+1,1);
      newtext(1:end-1) = cwhstring;
      newtext(end) = {inputstring};
      set(cwh,'String',newtext);
      set(cwh,'ListBoxTop',numel(newtext),'Value',numel(newtext));
      drawnow;
      ii = ii+1;
  end
end