function ButtonName=questdlg(Question,Title,Btn1,Btn2,Btn3,Default)
% QUESTDLG Question dialog box.
%  ButtonName=QUESTDLG(Question) creates a modal dialog box that
%  automatically wraps the cell array or string (vector or matrix)
%  Question to fit an appropriately sized window.  The name of the
%  button that is pressed is returned in ButtonName.  The Title of
%  the figure may be specified by adding a second string argument:
%
%    ButtonName=questdlg(Question, Title)
%
%  Question will be interpreted as a normal string.
%
%  QUESTDLG uses UIWAIT to suspend execution until the user responds.
%
%  The default set of buttons names for QUESTDLG are 'Yes','No' and
%  'Cancel'.  The default answer for the above calling syntax is 'Yes'.
%  This can be changed by adding a third argument which specifies the
%  default Button:
%
%    ButtonName=questdlg(Question, Title, 'No')
%
%  Up to 3 custom button names may be specified by entering
%  the button string name(s) as additional arguments to the function
%  call.  If custom button names are entered, the default button
%  must be specified by adding an extra argument, DEFAULT, and
%  setting DEFAULT to the same string name as the button you want
%  to use as the default button:
%
%    ButtonName=questdlg(Question, Title, Btn1, Btn2, DEFAULT);
%
%  where DEFAULT is set to Btn1.  This makes Btn1 the default answer.
%  If the DEFAULT string does not match any of the button string names,
%  a warning message is displayed.
%
%  To use TeX interpretation for the Question string, a data
%  structure must be used for the last argument, i.e.
%
%    ButtonName=questdlg(Question, Title, Btn1, Btn2, OPTIONS);
%
%  The OPTIONS structure must include the fields Default and Interpreter.
%  Interpreter may be 'none' or 'tex' and Default is the default button
%  name to be used.
%
%  If the dialog is closed without a valid selection, the return value
%  is empty.
%
%  Example:
%
%  ButtonName=questdlg('What is your favorite color?', ...
%                        'Color Question', ...
%                        'Red', 'Green', 'Blue', 'Green');
%  switch ButtonName,
%    case 'Red',
%     disp('Your favorite color is Red');
%    case 'Blue',
%     disp('Your favorite color is Blue.')
%     case 'Green',
%      disp('Your favorite color is Green.');
%  end % switch
%
%  See also DIALOG, ERRORDLG, HELPDLG, INPUTDLG, LISTDLG,
%    MSGBOX, WARNDLG, FIGURE, TEXTWRAP, UIWAIT, UIRESUME.
%  Copyright 1984-2010 The MathWorks, Inc.
%  $Revision: 5.55.4.17 $

  if nargin<1
    error('MATLAB:questdlg:TooFewArguments', 'Too few arguments for QUESTDLG');
  end

  Interpreter='none';
  Question=dialogCellstrHelper(Question);

  % General Information
  Black         =[0       0        0      ]/255;
  % LightGray   =[192     192      192    ]/255;
  % LightGray2  =[160     160      164    ]/255;
  % MediumGray  =[128     128      128    ]/255;
  % White       =[255     255      255    ]/255;

  % Nargin Check
  if nargout>1
    error('MATLAB:questdlg:WrongNumberOutputs', 'Wrong number of output arguments for QUESTDLG');
  end
  
  if nargin==1,Title=' ';end
  if nargin<=2, Default='Yes';end
  if nargin==3, Default=Btn1 ;end
  if nargin<=3, Btn1='Yes'; Btn2='No'; Btn3='Cancel';NumButtons=3;end
  if nargin==4, Default=Btn2;Btn2=[];Btn3=[];NumButtons=1;end
  if nargin==5, Default=Btn3;Btn3=[];NumButtons=2;end
  if nargin==6, NumButtons=3;end
  if nargin>6
    error('MATLAB:questdlg:TooManyInputs', 'Too many input arguments');NumButtons=3; %#ok
  end

  if isstruct(Default),
    Interpreter=Default.Interpreter;
    Default=Default.Default;
  end

  % Create QuestFig
  FigPos=get(0,'DefaultFigurePosition');
  FigPos(3)=267;
  FigPos(4)=70;
  FigPos=getnicedialoglocation(FigPos, get(0,'DefaultFigureUnits'));

  QuestFig=dialog(...
    'Visible'         ,'off', ...
    'Name'            ,Title, ...
    'Pointer'         ,'arrow', ...
    'Position'        ,FigPos, ...
    'KeyPressFcn'     ,@doFigureKeyPress, ...
    'IntegerHandle'   ,'off', ...
    'WindowStyle'     ,'normal', ...
    'HandleVisibility','callback', ...
    'CloseRequestFcn' ,@doDelete, ...
    'Tag'             ,Title ...
  );

  % Set Positions
  DefOffset  =10;
  IconWidth  =54;
  IconHeight =54;
  IconXOffset=DefOffset;
  IconYOffset=FigPos(4)-DefOffset-IconHeight;  %#ok
  IconCMap=[Black;get(QuestFig,'Color')];  %#ok
  DefBtnWidth =56;
  BtnHeight   =22;
  BtnYOffset=DefOffset;
  BtnWidth=DefBtnWidth;
  ExtControl=uicontrol(...
    QuestFig   , ...
    'Style'    ,'pushbutton', ...
    'String'   ,' '          ...
  );
  btnMargin=1.4;
  set(ExtControl,'String',Btn1);
  BtnExtent=get(ExtControl,'Extent');
  BtnWidth=max(BtnWidth,BtnExtent(3)+8);
  if NumButtons > 1
    set(ExtControl,'String',Btn2);
    BtnExtent=get(ExtControl,'Extent');
    BtnWidth=max(BtnWidth,BtnExtent(3)+8);
    if NumButtons > 2
      set(ExtControl,'String',Btn3);
      BtnExtent=get(ExtControl,'Extent');
      BtnWidth=max(BtnWidth,BtnExtent(3)*btnMargin);
    end
  end
  BtnHeight=max(BtnHeight,BtnExtent(4)*btnMargin);
  delete(ExtControl);
  MsgTxtXOffset=IconXOffset+IconWidth;
  FigPos(3)=max(FigPos(3),MsgTxtXOffset+NumButtons*(BtnWidth+2*DefOffset));
  set(QuestFig,'Position',FigPos);
  BtnXOffset=zeros(NumButtons,1);
  if NumButtons==1,
    BtnXOffset=(FigPos(3)-BtnWidth)/2;
  elseif NumButtons==2,
    BtnXOffset=[MsgTxtXOffset FigPos(3)-DefOffset-BtnWidth];
  elseif NumButtons==3,
    BtnXOffset=[MsgTxtXOffset 0 FigPos(3)-DefOffset-BtnWidth];
    BtnXOffset(2)=(BtnXOffset(1)+BtnXOffset(3))/2;
  end
  MsgTxtYOffset=DefOffset+BtnYOffset+BtnHeight;

  % Calculate current msg text width and height. If negative,
  % clamp it to 1 since its going to be recalculated/corrected later
  % based on the actual msg string
  MsgTxtWidth=max(1, FigPos(3)-DefOffset-MsgTxtXOffset-IconWidth);
  MsgTxtHeight=max(1, FigPos(4)-DefOffset-MsgTxtYOffset);
  MsgTxtForeClr=Black;
  MsgTxtBackClr=get(QuestFig,'Color');
  CBString='uiresume(gcbf)';
  DefaultValid=false;
  DefaultWasPressed=false;
  BtnHandle=cell(NumButtons, 1);
  DefaultButton=0;

  % Check to see if the Default string passed does match one of the
  % strings on the buttons in the dialog. If not, throw a warning.
  for i=1:NumButtons
    switch i
      case 1
        ButtonString=Btn1;
        ButtonTag='Btn1';
        if strcmp(ButtonString, Default)
          DefaultValid=true;
          DefaultButton=1;
        end
      case 2
        ButtonString=Btn2;
        ButtonTag='Btn2';
        if strcmp(ButtonString, Default)
          DefaultValid=true;
          DefaultButton=2;
        end
      case 3
        ButtonString=Btn3;
        ButtonTag='Btn3';
        if strcmp(ButtonString, Default)
          DefaultValid=true;
          DefaultButton=3;
        end
    end

    BtnHandle{i}=uicontrol(QuestFig, ...
      'Style'              ,'pushbutton', ...
      'Position'           ,[ BtnXOffset(1) BtnYOffset BtnWidth BtnHeight ], ...
      'KeyPressFcn'        ,@doControlKeyPress, ...
      'Callback'           ,CBString, ...
      'String'             ,ButtonString, ...
      'HorizontalAlignment','center', ...
      'Tag'                ,ButtonTag...
    );
  end

  if ~DefaultValid
    warnstate=warning('backtrace','off');
    warning('MATLAB:QUESTDLG:stringMismatch','Default string does not match any button string name.');
    warning(warnstate);
  end

  MsgHandle=uicontrol(QuestFig, ...
    'Style'              ,'text', ...
    'Position'           ,[MsgTxtXOffset MsgTxtYOffset 0.95*MsgTxtWidth MsgTxtHeight ], ...
    'String'             ,{' '}, ...
    'Tag'                ,'Question', ...
    'HorizontalAlignment','left', ...
    'FontWeight'         ,'bold', ...
    'BackgroundColor'    ,MsgTxtBackClr, ...
    'ForegroundColor'    ,MsgTxtForeClr ...
  );

  [WrapString,NewMsgTxtPos]=textwrap(MsgHandle,Question,75);
  % NumLines=size(WrapString,1);
  AxesHandle=axes('Parent',QuestFig,'Position',[0 0 1 1],'Visible','off');
  texthandle=text( ...  
    'Parent'              ,AxesHandle                      , ...
    'Units'               ,'pixels'                        , ...
    'Color'               ,get(BtnHandle{1},'ForegroundColor')   , ...
    'HorizontalAlignment' ,'left'                          , ...
    'FontName'            ,get(BtnHandle{1},'FontName')    , ...
    'FontSize'            ,get(BtnHandle{1},'FontSize')    , ...
    'VerticalAlignment'   ,'bottom'                        , ...
    'String'              ,WrapString                      , ...
    'Interpreter'         ,Interpreter                     , ...
    'Tag'                 ,'Question'                        ...
  );

  textExtent=get(texthandle, 'Extent');
  % (g357851)textExtent and extent from uicontrol are not the same. For window, extent from uicontrol is larger
  % than textExtent. But on Mac, it is reverse. Pick the max value.
  MsgTxtWidth=max([MsgTxtWidth NewMsgTxtPos(3)+2 textExtent(3)]);
  MsgTxtHeight=max([MsgTxtHeight NewMsgTxtPos(4)+2 textExtent(4)]);
  MsgTxtXOffset=IconXOffset+IconWidth+DefOffset;
  FigPos(3)=max(NumButtons*(BtnWidth+DefOffset)+DefOffset, ...
    MsgTxtXOffset+MsgTxtWidth+DefOffset);
  % Center Vertically around icon
  if IconHeight>MsgTxtHeight,
    IconYOffset=BtnYOffset+BtnHeight+DefOffset;
    MsgTxtYOffset=IconYOffset+(IconHeight-MsgTxtHeight)/2;
    FigPos(4)=IconYOffset+IconHeight+DefOffset;
  % Center around text
  else
    MsgTxtYOffset=BtnYOffset+BtnHeight+DefOffset;
    IconYOffset=MsgTxtYOffset+(MsgTxtHeight-IconHeight)/2;
    FigPos(4)=MsgTxtYOffset+MsgTxtHeight+DefOffset;
  end

  if NumButtons==1
    BtnXOffset=(FigPos(3)-BtnWidth)/2;
  elseif NumButtons==2
    BtnXOffset=[(FigPos(3)-DefOffset)/2-BtnWidth (FigPos(3)+DefOffset)/2];
  elseif NumButtons==3
    BtnXOffset(2)=(FigPos(3)-BtnWidth)/2;
    BtnXOffset=[BtnXOffset(2)-DefOffset-BtnWidth BtnXOffset(2) BtnXOffset(2)+BtnWidth+DefOffset];
  end

  set(QuestFig ,'Position',getnicedialoglocation(FigPos, get(QuestFig,'Units')));
  assert(iscell(BtnHandle));
  BtnPos=cellfun(@(bh)get(bh,'Position'), BtnHandle, 'UniformOutput', false);
  BtnPos=cat(1,BtnPos{:});
  BtnPos(:,1)=BtnXOffset;
  BtnPos=num2cell(BtnPos,2);
  assert(iscell(BtnPos));
  cellfun(@(bh,pos)set(bh, 'Position', pos), BtnHandle, BtnPos, 'UniformOutput', false);

  if DefaultValid
    setdefaultbutton(QuestFig, BtnHandle{DefaultButton});
  end

  delete(MsgHandle);
  set(texthandle, 'Position',[MsgTxtXOffset MsgTxtYOffset 0]);

  IconAxes=axes(...
    'Parent'      ,QuestFig              , ...
    'Units'       ,'Pixels'              , ...
    'Position'    ,[IconXOffset IconYOffset IconWidth IconHeight], ...
    'NextPlot'    ,'replace'             , ...
    'Tag'         ,'IconAxes'              ...
  );

  set(QuestFig ,'NextPlot','add');
  load dialogicons.mat questIconData questIconMap;
  IconData=questIconData;
  questIconMap(256,:)=get(QuestFig,'Color');
  IconCMap=questIconMap;
  Img=image('CData',IconData,'Parent',IconAxes);
  set(QuestFig, 'Colormap', IconCMap);
  set(IconAxes, ...
    'Visible','off'           , ...
    'YDir'   ,'reverse'       , ...
    'XLim'   ,get(Img,'XData'), ...
    'YLim'   ,get(Img,'YData')  ...
  );

  % Make sure we are on screen
  movegui(QuestFig)
  set(QuestFig ,'WindowStyle','modal','Visible','on');
  drawnow;

  if DefaultButton ~=0
    uicontrol(BtnHandle{DefaultButton});
  end

  if ishghandle(QuestFig)
    % Go into uiwait if the figure handle is still valid.
    % This is mostly the case during regular use.
    uiwait(QuestFig);
  end

  % Check handle validity again since we may be out of uiwait because the
  % figure was deleted.
  if ishghandle(QuestFig)
    if DefaultWasPressed
      ButtonName=Default;
    else
      ButtonName=get(get(QuestFig,'CurrentObject'),'String');
    end
    doDelete;
  else
    ButtonName='';
  end

  function doFigureKeyPress(obj, evd)  %#ok
    switch(evd.Key)
      case {'return','space'}
        if DefaultValid
          DefaultWasPressed=true;
          uiresume(gcbf);
        end
      case 'escape'
        doDelete
    end
  end

  function doControlKeyPress(obj, evd)  %#ok
    switch(evd.Key)
      case {'return'}
        if DefaultValid
          DefaultWasPressed=true;
          uiresume(gcbf);
        end
      case 'escape'
        doDelete
    end
  end

  function doDelete(varargin)
    delete(QuestFig);
  end
end