helpwindow.m

信号实验常用的simulink模型和mfile,可直接在matlan下运行。

function helpwindow(topic,pagetitle,helptitle,varargin)
%HELPWIN On-line help, separate window for navigation.
%   HELPWIN TOPIC opens a help window and displays the help text for the
%   given TOPIC.  Links are created to functions referenced in the 'See Also'
%   line of the help text.
%
%   HELPWIN(HELP_STR,TITLE) displays the string HELP_STR in the help
%   window.  HELP_STR may be passed in as a string with each line separated
%   by carriage returns, a column vector cell array of strings with each cell
%   (row) representing a line or as a string matrix with each row representing
%   a line.  The optional string TITLE will appear in the title edit box.
%
%   HELPWIN({TITLE1 HELP_STR1;TITLE2 HELP_STR2;...},PAGE) displays one page
%   of multi-page help text.  The multi-page help text is passed in as a
%   cell array of strings or cells containing TITLE and HELP_STR pairs.
%   Each row of the multi-page help text cell array (dimensioned number of
%   pages by 2) consists of a title string paired with a string, cell array
%   or string matrix of help text.  The second argument PAGE is a string 
%   which must match one of the TITLE entries in the multi-page help text.
%   The matching TITLE represents the page that is to be displayed first.
%   If no second argument is given, the first page is displayed.
%
%   A third argument may be passed to HELPWIN which is a string that becomes
%   the title of the help window figure.
%
%   Additional arguments, after the window title, will be interpreted as
%   Handle Graphics parameter-value pairs to be applied to the text displayed
%   in the help window.
%
%   Examples.
%             helpwin plot
%             helpwin('Help String','title')
%             helpwin(['Help text for' sprintf('\n') 'my m-file.'],'title')
%             helpwin({'Help String for';'my m-file'},'title')
%             helpwin(str,'Topic 2','My Title')
%               where,
%               str =  { 'Topic 1' 'Help string for Topic 1';
%                        'Topic 2' 'Help string for Topic 2';
%                        'Topic 3' 'Help string for Topic 3' }
%
%   See also DOC, DOCOPT, HELP, WEB.

%   Copyright (c) 1984-98 by The MathWorks, Inc.
%   $Revision: 1.30 $

% If no arguments are given, load up the Home help page.
if nargin==0
   topic = 'HelpwinHome';
end

% Switchyard on 'topic'.  It is either a command or a help entry.
if iscell(topic), 
   cmd = char(topic(1,1));
else
   cmd = char(topic(1,:));
end

switch cmd

%-----------------------------------------------------------------------
case 'HelpwinPage'
   % This case is used to link a page to others pages in the text entry.
   TopicPop = gcbo;
   val = get(TopicPop,'value');
   if val~=1
      refstr = get(TopicPop,'string');
      ref = deblank(refstr{val});
      topic = get(TopicPop,'userdata');
      helpwindow(topic,ref);
   end

%-----------------------------------------------------------------------
case 'HelpwinSeealso'
   % This case is used to link a page to others referenced in the
   % See Also text.
   SeeAlsoPop = gcbo;
   val = get(SeeAlsoPop,'value');
   if val~=1
      set(SeeAlsoPop,'value',1);
      refstr = get(SeeAlsoPop,'string');
      ref = deblank(refstr{val});
      if length(ref) >= 5
         if strcmp(ref(1:5),'More ')
            ind = max(findstr(ref,' help'));
            if ~isempty(ind)
               doc(ref(6:ind-1));
            end
         else
            helpwindow(ref);
         end
      else
         helpwindow(ref);
      end
   end
   
%-----------------------------------------------------------------------
case 'HelpwinBack'
   % This case is used to go back one page in the stack.
   BackBtn = gcbo;
   fig = gcbf;
   fud = get(fig,'UserData');
   pgtitle = get(findobj(fig,'tag','CurHelpEdit'),'string');
   if pgtitle(1) == ' ', pgtitle(1) = []; end  % remove first char if space
   match = max(strmatch(pgtitle,{fud.pagetitle},'exact'));
   ref = fud(match+1);
   set(BackBtn,'UserData',1);  % set flag to indicate Back call
   helpwindow(ref.topic,ref.pagetitle,ref.helptitle);
   
%-----------------------------------------------------------------------
case 'HelpwinForward'
   % This case is used to go forward one page in the stack.
   fig = gcbf;
   BackBtn = findobj(fig,'Tag','BackBtn');
   fud = get(fig,'UserData');
   pgtitle = get(findobj(fig,'tag','CurHelpEdit'),'string');
   if pgtitle(1) == ' ', pgtitle(1) = []; end  % remove first char if space
   match = min(strmatch(pgtitle,{fud.pagetitle},'exact'));
   ref = fud(match-1);
   set(BackBtn,'UserData',1);  % set flag to indicate Back/Forw call to
   helpwindow(ref.topic,ref.pagetitle,ref.helptitle);
   
%-----------------------------------------------------------------------
case 'HelpwinHome'
   % This case is used to go to the Home help screen.
   str = help;
   helpwindow({str},'MATLAB Help Topics');
   
%-----------------------------------------------------------------------
case 'HelpwinOpen'
   % This case is used to open another link from a double-click in
   % the list box.

   % Determine whether this is a double click.
   fig = gcbf;
   if strcmp(get(fig,'SelectionType'),'open')
      ListBox = findobj(fig,'Tag','ListBox');
      SeeAlsoPop = findobj(fig,'tag','SeeAlsoPop');

      ln = get(ListBox,'value');
      helpstr = get(ListBox,'string');      

      % Find the function link index or the See Also index.
      hstr = helpstr';
      hstr = lower(hstr(:)');
      cols = size(helpstr,2);
      seealso = floor((findstr('see also',hstr)/cols) + 1);
      dash = floor((findstr(' - ',hstr)/cols) + 1);

      % If there is a 'See Also', follow the 'See also' index
      if ~isempty(seealso)
         if ln == seealso
            % Determine which item in the list is a the first in the 
            % 'See also' text list.
            poplist = get(SeeAlsoPop,'string');
            if length(poplist{2}) >= 5
               if strcmp(poplist{2}(1:5),'More ')
                  val = 3;
               else
                  val = 2;
               end
            else
               val = 2;
            end         
            helpwindow(poplist{val});  % gets first reference in 'See also' list.
            
         end
      end

      % If there are dashes follow the function link.
      if ~isempty(dash)
         if any(ln == dash)
            loc = min(findstr('-',helpstr(ln,:)));
            ref = deblank(helpstr(ln,1:loc-1));
            ind = min(find(isletter(ref)));
            ref = ref(ind:end);
            % Process a 'Readme' tag.
            if strcmp(ref,'Readme')
               CurHelpEdit = findobj(fig,'Tag','CurHelpEdit');
               pre = deblank(get(CurHelpEdit,'string'));
               if (pre(1)==' '), pre(1) = []; end
               helpwindow([pre filesep ref]);
            % Else, just follow the link.   
            else
               helpwindow(ref);
            end
         end
      end

   end

%-----------------------------------------------------------------------
case 'HelpwinHelpDesk'
   % This case is used to link HTML-based documentaion.
   doc;   
   
%-----------------------------------------------------------------------
case 'HelpwinMoreHelp'
   % This case is used to link HTML-based documentaion.
   nexttopic = get(findobj(gcbf,'tag','CurHelpEdit'),'string');
   if nexttopic(1) == ' ', nexttopic(1) = []; end  % remove first char if space
   doc(nexttopic);

%-----------------------------------------------------------------------
case 'HelpwinResize'
   % This case is used to reset the position of the buttons and the
   % frames is the helpwin figure is resized.

   % Get the new figure position in points.
   fig = gcbf;
   pos = get(fig,'Position');
   figwidth = pos(3);

   % Get all of the necessary handles.
   ListBox = findobj(fig,'tag','ListBox');
   CurHelpEdit = findobj(fig,'tag','CurHelpEdit');
   SeeAlsoPop = findobj(fig,'tag','SeeAlsoPop');
   HomeBtn = findobj(fig,'tag','HomeBtn');
   BackBtn = findobj(fig,'tag','BackBtn');
   ForwardBtn = findobj(fig,'tag','ForwardBtn');
   HelpDeskBtn = findobj(fig,'tag','HelpDeskBtn');
   HelpBtn = findobj(fig,'tag','HelpBtn');
   CloseBtn = findobj(fig,'tag','CloseBtn');
   
   % Set the top frame and buttons to their correct positions.
   wid = 170; wid2 = 60; spc = 8;
   ht = 21;   frmht = 54;
   [fname,fsize,bdr] = goodfonts(computer);

   set(CurHelpEdit,'Position',[spc pos(4)-frmht+ht+8 2*wid2+spc ht]);
   set(SeeAlsoPop,'Position',[2*wid2+3*spc pos(4)-frmht+ht+8 2*wid2+spc ht]);
   set(HomeBtn,'Position',[2*wid2+3*spc pos(4)-frmht+4 wid2 ht]);
   set(BackBtn,'Position',[spc pos(4)-frmht+4 wid2 ht]);
   set(ForwardBtn,'Position',[wid2+2*spc pos(4)-frmht+4 wid2 ht]);
   set(HelpDeskBtn,'Position',[figwidth-2*(wid2+spc) pos(4)-frmht+ht+8 2*wid2+spc ht]);
   set(HelpBtn,'Position',[figwidth-2*(wid2+spc) pos(4)-frmht+4 wid2 ht]);
   set(CloseBtn,'Position',[figwidth-(wid2+spc) pos(4)-frmht+4 wid2 ht]);
   
   % Set the list box to fill the rest of the figure.
   set(ListBox,'Position',[bdr 0 pos(3) pos(4)-frmht]);
      
%-----------------------------------------------------------------------
otherwise

   % Try to find the figure.  Note the awkward spelling of the tag to prevent
   % others from accidentally grabing this hidden figure.
   fig = findobj(allchild(0),'tag','MiniHelPFigurE');
   CR = sprintf('\n');

   % Determine if the input consists of a cell array or paged help text.
   topic_is_cell = iscell(topic);
   multi_page_text = topic_is_cell & (size(topic,2) > 1);
   
   % Strip off the first character if it is a space.  The space is inserted
   % on purpose for better display in the edit box.
   if ~topic_is_cell & size(topic,1) == 1 & topic(1)==' ' , topic(1) = []; end

   % Create the figure if it doesn't exist.
   if isempty(fig),
      % Params.
      wid = 170; wid2 = 60; spc = 8;
      ht = 21;   frmht = 54;

      % Get a good font and figure size for this platform.
      [fname,fsize,bdr] = goodfonts(computer);
      
      % Create the figure.
      fig = figure( ...
         'Visible','off', ...
         'HandleVisibility','off', ...
         'MenuBar','none', ...
         'Name','MATLAB Help Window', ...
         'Color',get(0,'defaultuicontrolbackgroundcolor'), ...
         'NumberTitle','off', ...
         'IntegerHandle','off', ...
         'Units','Points', ...
         'ResizeFcn','helpwindow(''HelpwinResize'')', ...
         'Tag','MiniHelPFigurE');
      
      % Test the chosen font to get the best figure width.
      str = ['01234567890123456789012345678901234567890123456789012345678901234567890123456789'];
      t = uicontrol('Parent',fig, ...
         'Units','points', ...
         'FontName',fname, ...
         'FontSize',fsize, ...
         'String',str);
      figwidth = get(t,'extent');
      figwidth = figwidth(3);
      delete(t);
      pos = get(fig,'position');  % Gets default figure position in points.
      bdr = bdr * get(0,'ScreenPixelsPerInch') / 72;  % Convert Pixels to Points.
      figpos = [(2*pos(1) + pos(3) - figwidth)/2 pos(2) figwidth pos(4)] + ...
               [-bdr 0 bdr 0];
      
      % Set the best figure position.
      set(fig,'Position',figpos);
      
      % Create the rest of the UIs.
      ListBox = uicontrol('Parent',fig, ...
         'BackgroundColor',[1 1 1], ...
         'CallBack','helpwindow(''HelpwinOpen'');', ...
         'FontName',fname, ...
         'FontSize',fsize, ...
         'Max',2, ...
         'Units','Points', ...
         'Position',[bdr 0 figwidth pos(4)-frmht], ...
         'String',' ', ...
         'Style','listbox', ...
         'Tag','ListBox', ...
         'Value',[]);
      CurHelpEdit = uicontrol('Parent',fig, ...
         'BackgroundColor',[1 1 1], ...
         'Units','Points', ...
         'Position',[spc pos(4)-frmht+ht+8 2*wid2+spc ht], ...
         'Style','edit', ...
         'HorizontalAlignment','left', ...
         'Tag','CurHelpEdit', ...
         'Callback','helpwindow(get(gcbo,''string''));');
      SeeAlsoPop = uicontrol('Parent',fig, ...
         'BackgroundColor',[1 1 1], ...
         'CallBack','helpwindow(''HelpwinSeealso'');', ...
         'Min',1, ...
         'Units','Points', ...
         'Position',[2*wid2+3*spc pos(4)-frmht+ht+8 2*wid2+spc ht], ...
         'String','See also', ...
         'Style','popupmenu', ...