helpwindow.m

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

         'HorizontalAlignment','left', ...
         'Tag','SeeAlsoPop', ...
         'Value',1);
      HomeBtn = uicontrol('Parent',fig, ...
         'CallBack','helpwindow(''HelpwinHome'');', ...
         'Units','Points', ...
         'Position',[2*wid2+3*spc pos(4)-frmht+4 wid2 ht], ...
         'String','Home', ...
         'Tag','HomeBtn');
      BackBtn = uicontrol('Parent',fig, ...
         'CallBack','helpwindow(''HelpwinBack'');', ...
         'Units','Points', ...
         'Position',[spc pos(4)-frmht+4 wid2 ht], ...
         'String','Back', ...
         'UserData',0, ...
         'Tag','BackBtn');
      ForwardBtn = uicontrol('Parent',fig, ...
         'CallBack','helpwindow(''HelpwinForward'');', ...
         'Units','Points', ...
         'Position',[wid2+2*spc pos(4)-frmht+4 wid2 ht], ...
         'String','Forward', ...
         'Tag','ForwardBtn');
      HelpDeskBtn = uicontrol('Parent',fig, ...
         'Units','Points', ...
         'Position',[figwidth-2*(wid2+spc) pos(4)-frmht+ht+8 2*wid2+spc ht], ...
         'Style','Pushbutton', ...
         'HorizontalAlignment','center', ...
         'String','Go to Help Desk', ...
         'Tag','HelpDeskBtn', ...
         'Callback','helpwindow(''HelpwinHelpDesk'');');
      HelpBtn = uicontrol('Parent',fig, ...
         'CallBack','helpwindow(''helpinfo'');', ...
         'Units','Points', ...
         'Position',[figwidth-2*(wid2+spc) pos(4)-frmht+4 wid2 ht], ...
         'String','Tips', ...
         'Tag','HelpBtn');
      CloseBtn = uicontrol('Parent',fig, ...
         'CallBack','set(gcbf,''visible'',''off'')', ...
         'Units','Points', ...
         'Position',[figwidth-(wid2+spc) pos(4)-frmht+4 wid2 ht], ...
         'String','Close', ...
         'Tag','CloseBtn');
      
      % Set 'Busy Action, Queue' and 'Interruptible, Off' on all objects.
      set(findobj(fig),'BusyAction','queue','Interruptible','off');

   else
      figure(fig);
      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');      

   end
   
   % Turn on figure visiblity.
   set(fig,'visible','on');

   % Create Page popup if not necessary and non-existent.  Otherwise, simply
   % load up the help string with the help text for the requested topic.
   if multi_page_text
      % Get the help text for the requested topic from the cell array.
      if nargin < 2
         pagetitle = topic{1,1};
      elseif isempty(pagetitle)
         pagetitle = topic{1,1};
      end
      ind = strmatch(pagetitle,topic(:,1),'exact');
      if isempty(ind), ind = 1; end

      helpstr = char(topic{ind,2});
      slash_n = find(helpstr==CR);
      if slash_n
         % Replace pipes with '!' for display if necessary,
         % replace the carriage returns in the help string with pipes
         % so that the list box can correctly interpret them.
         % Add one extra line to top of display.  
         helpstr(find(helpstr == '|')) = '!';
         helpstr(slash_n) = '|';
         helpstr = ['|' helpstr];
      else
         % Add one extra line to top of display.  
         helpstr = str2mat('',helpstr);
      end

      % Set the popup string.
      ref = [{'Topics'}; topic(:,1)];
      if length(ref) < 2
         set(SeeAlsoPop,'string',ref,...
             'enable','off');
      else
         set(SeeAlsoPop,'string',ref, ...
             'callback','helpwindow(''HelpwinPage'');', ...
             'enable','on',...
             'value',1,...
             'userdata',topic);
      end

      % Set the current topic.
      pgtitle = topic{ind,1};
      
   elseif (iscell(topic) | any(find(topic==32)) | ...
           size(topic,1) > 1 | any(find(topic==CR)))
      helpstr = char(topic);
      slash_n = find(helpstr==CR);
      if slash_n
         % Replace pipes with '!' for display if necessary,
         % replace the carriage returns in the help string with pipes
         % so that the list box can correctly interpret them.
         % Add one extra line to top of display.  
         helpstr(find(helpstr == '|')) = '!';
         helpstr(slash_n) = '|';
         helpstr = ['|' helpstr];
      else
         % Add one extra line to top of display.  
         helpstr = str2mat('',helpstr);
      end

      if nargin < 2
         pgtitle = 'MATLAB Help';
      else
         if isempty(pagetitle)
            pgtitle = 'MATLAB Help';
         else
            pgtitle = pagetitle;
         end
      end
      
   else
      % Get the help text for the requested topic.
      helpstr = help(topic);
      slash_n = 1;
      pgtitle = topic;

      % Error handling.  If topic not found, send an error message to the window.
      if isempty(helpstr)
         helpstr = [CR ' Topic ''' pgtitle ''' was not found.'];
      end

      % Replace pipes with '!' for display if necessary,
      % replace the carriage returns in the help string with pipes
      % so that the list box can correctly interpret them.
      % Add one extra line to top of display.  
      helpstr(find(helpstr == '|')) = '!';
      helpstr(find(helpstr==CR)) = '|';
      helpstr = ['|' helpstr];
         
   end
      
   % Store the arguments in the userdata of the figure.  This is a stack
   % which enables the Back button to work for the last few selections.
   fud = get(fig,'UserData');
   curArg = struct('topic',{[]},'pagetitle',{[]},'helptitle',{[]});
   curArg.topic = topic;
   curArg.pagetitle = pgtitle;
   if nargin >= 3
      curArg.helptitle = helptitle;
   end
   if isempty(fud)
      fud = curArg;  % protects for first time through code.
   else
      backflag = get(BackBtn,'UserData');  % flag to indicate that Back/Forw button was
      if backflag == 0                     % pressed.
         str = get(CurHelpEdit,'string');
         if str(1) == ' ', str(1) = []; end;  % remove first char is space
         match = strmatch(str,{fud.pagetitle},'exact');
         if ~isempty(match)
            fud(1:match-1) = [];     % eliminate the items 'above' the selected items
         end
         fud = [curArg fud];
         if length(fud) >= 7         % limits stack to 6 elements
            fud(7) = [];             % or 5 Back button presses
         end
      else
         set(BackBtn,'UserData',0);  % clear backflag
      end
   end
   set(fig,'UserData',fud);

   % Check to see whether the Back and Forward buttons should be disabled.
   match = strmatch(pgtitle,{fud.pagetitle},'exact');
   if max(match) == length(fud)
      set(BackBtn,'enable','off');
   else
      set(BackBtn,'enable','on');
   end
   if min(match) == 1
      set(ForwardBtn,'enable','off');
   else
      set(ForwardBtn,'enable','on');
   end
   
   % Replace all tabs with single spaces.
   helpstr(find(helpstr==9)) = ' ';
   
   % Set the listbox string to the help string and set the topic name in the
   % edit box.
   set(CurHelpEdit,'string',[' ' pgtitle]);  % extra space for better display.
   set(ListBox,'value',[],'string',helpstr,'ListBoxTop',1);
   
   if any(slash_n) & ~multi_page_text
      % Set up the string for the See Also pop-up
      cnt=1;
      ref={'See also'};
      if ~(any(find(pgtitle==filesep)) | ...
           any(find(pgtitle=='/')) | ...
           any(find(pgtitle(2:end)==' ')))
         ref = {'See also' ['More ' pgtitle ' help (HTML)']};
         cnt = cnt + 1;
      end
      
      % Enable links to the related topics found after the 'See Also'.
      seealso=max(findstr(helpstr,'See also'));  % Finds LAST 'See Also'.
      overind = max(findstr(helpstr,'| Overloaded methods'));
      if ~isempty(seealso)
         p=seealso+8;
         lmask=[zeros(1,p-1) isletter(helpstr(p:end))];
         umask=helpstr==upper(helpstr);
         undmask=helpstr=='_';
         nmask = [zeros(1,p-1) ...
               ((helpstr(p:end) >= '0') & (helpstr(p:end) <= '9'))];
         rmask=lmask&umask | undmask | nmask;
         ln=length(helpstr);
         if ~isempty(overind), ln=overind-1; end
         while 1
            q=p;
            while ~rmask(p) & p<ln
               p=p+1;
            end
            q=p+1;
            if q>=ln, break; end
            while rmask(q)
               q=q+1;
            end
            cnt=cnt+1;
            if q>p+1,  % Protects against single letter references.
               ref{cnt}=lower(helpstr(p:q-1));
            end
            p=q;
         end
      end
   
      % Enable link to overloaded methods.
      if ~isempty(overind)
         ln = length(helpstr);
         eol = find(helpstr(overind+1:ln)=='|');
         p = findstr(helpstr(overind:ln),'help ');
         for i=1:length(p)
            cnt = cnt + 1;
            ref{cnt} = helpstr(overind+p(i)+4:overind+eol(i+1)-1);
         end
         
      end
   
      % Set the See Also popup values.
      set(SeeAlsoPop,'value',1);
      if size(ref,2) < 2
         set(SeeAlsoPop,'string',ref,...
             'enable','off');
      else
         set(SeeAlsoPop,'string',ref, ...
             'callback','helpwindow(''HelpwinSeealso'');', ...
             'enable','on');
      end

   elseif ~multi_page_text 
      set(SeeAlsoPop,'string',{'See also'},...
          'enable','off');

   end   

   % Set the figure title if supplied.
   if nargin >= 3
      if isempty(helptitle)
         set(fig,'Name','MATLAB Help Window');
      else
         set(fig,'Name',helptitle);
      end
   else
      set(fig,'Name','MATLAB Help Window');
   end

   % Set any HG properties that were passed in.
   if ~isempty(varargin)
      narg = length(varargin);
      set(ListBox,varargin(1:2:narg),varargin(2:2:narg))
   end

end

% Done.

%-----------------Function GOODFONTS-----------------
function [fname,fsize,listboxbdr] = goodfonts(computer)
%       Returns a good font for a list box on this platform
%       and return the resulting figure width for an 80 column
%       display.

% fname - string
% fsize - points
% listboxbdr - pixels for frame

switch computer

case 'PCWIN'
   fname = 'Courier';
   fsize = 10;
   listboxbdr = 0;

case 'MAC2'
   fname = 'Monaco';
   fsize = 9;
   listboxbdr = 3;

otherwise
   fname = 'Courier';
   fsize = 10;
   listboxbdr = 0;

end