GUI Examples #5: Explore simple string manipulation and user notification
function [] = GUI_5() % Demonstrate how to use a pushbutton to delete bits of string and how to % let the user know that their actions are futile. After the string is % deleted completely, the user is informed that there is nothing left to % delete if the delete button is pressed again. A color change accompanies % this announcement. % % Suggested exercise: Add a counter to S that starts incrementing when the % warning is given. If the user clicks again, close the GUI. % % % Author: Matt Fig % Date: 7/15/2009 S.fh = figure('units','pixels',... 'position',[300 300 300 100],... 'menubar','none',... 'name','GUI_5',... 'numbertitle','off',... 'resize','off'); S.pb = uicontrol('style','push',... 'unit','pix',... 'position',[20 10 260 30],... 'string','Deleter'); S.tx = uicontrol('style','text',... 'unit','pix',... 'position',[20 50 260 30],... 'fontsize',16,... 'string','DeleteMe'); set(S.pb,'callback',{@pb_call,S}) % Set the callback for pushbutton. function [] = pb_call(varargin) % Callback for the pushbutton. S = varargin{3}; % Get the structure. T = get(S.tx,'string'); % Get the current string. if isempty(T) set(S.pb,'backgroundcolor',[1 .5 .5],'string','Nothing to Delete!') else set(S.tx,'str',T(1:end-1)); % Delete the last character in string. end
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