%! % Date: Thu, 30 Mar 89 11:44:54 EST % To: NeWS-makers@brillig.umd.edu % Subject: controlwindow without circularities % From: dennis!dennis@boulder.colorado.edu % % This is newer version of the ControlWindow that I posted % some months ago. The main difference is that it % has all of the circular references removed (I hope). % It requires the PlaneWindow that I also (re-)posted % very recently (i.e., today). % ================================================== systemdict /PlaneWindow known not { (planewindow.ps) run } if systemdict /Item known not { (NeWS/liteitem.ps) run } if %-------------------------------------------------- % Create a version of the PlaneWindow which has two panels at the bottom. % One is for displaying messages, and the other is for accepting % a line of text input by the user. % Several methods in the msgwindow class % are provided to write to the display area: % 1. "string DisplayString" % The DisplayString method clears the display panel % and prints the string in the panel. % 2. "format argarray DisplayFormat" % The DisplayFormat method clears the display panel, % formats the argarray using format string % and prints the result in the panel. % % Access to the reader panel is a bit more complicated: % 1. "string SetPrompt" % The SetPrompt method sets the prompt to be displayed % on the reader panel. % 2. "string SetInput" % The SetInput method sets the initial value of text % on the reader panel. % 3. "GetInput => string" % The GetInput method gets the current string contents % on the reader panel. % % Notification is handled in the following fashion. % The user invokes the following method to specify how he is to be notified % when the user hits in the reader panel. % 4. "[arg1 arg2 ... /operator client] SetReaderNotifier" % When return is hit in the reader panel, effectively the following occurs % arg0 arg1 ... /operator client send. % Note that this may occur asynchronously, which means that % the user might edit the reader panel, do a bunch of other stuff % and then later hit return. systemdict begin /ControlWindow PlaneWindow dictbegin /Display null def % Will be a msgitem /Reader null def % Will be a textitem /MsgWinEventMgr null def /ReaderAction null def dictend classbegin % Class Constants % Approximate constant for figuring out the placement of % the control elements (reader,display,scrollbar) /VerticalMeasure currentfont fontheight def % needs to be constant % Number of Vertical Measures used by the panels in Bottom Border % See /MoveFrameControls below. /VerticalCount 8 def % Fudge factor for sizing the borderbottom (if needed) /BBFudge 0 def /BorderLeft {/BorderRight super send} def /BorderBottom { VerticalMeasure VerticalCount mul /BorderBottom super send add BBFudge add round } def /DefaultPrompt (Input: ) def /destroy { % - => - (destroy frame control canvases/items) % break all outstanding cycles {removefocus /ReaderClient null store} Reader send /ReaderAction null store /Display null store /Reader null store MsgWinEventMgr dup null ne {killprocess} if /MsgWinEventMgr null store /destroy super send } def /CreateFrameControls { % - => - (Create frame control canvases/items) /CreateFrameControls super send () (Messages) /Right nullproc FrameCanvas /new MessageItem send /Display exch store {/EraseToUpdate true store} Display send {/ItemFrame 1 store} Display send (Input: ) () /Right {} FrameCanvas /new LineTextItem send /Reader exch store self { /ReaderClient exch def % (connect to parent window) /NotifyUser {/ReaderHandler ReaderClient send} store /ItemFrame 1 store % (to pretty up reader panel) } Reader send } def /CreateFrameInterests { % - => - (Create frame control interests) /CreateFrameInterests super send /MsgWinEventMgr [Reader] forkitems store } def /MoveFrameControls { % - => - ([Re]set frame control shapes) /MoveFrameControls super send 10 dict begin % track height used by each control as it is placed % order (and size) from bottom to top is : % margin 1/2 * VerticalMeasure % reader 3 * VerticalMeasure % margin 1/2 * VerticalMeasure % display 3 * VerticalMeasure % margin 1 * VerticalMeasure % hscrollbar 18 % Total should be less than the Border bottom defined at % beginning of this class /CurrentBottom VerticalMeasure 2 div def /Width ClientWidth 2 add def % same for everybody /X BorderLeft 1 sub def % same for everybody % Adjust label and object position Reader InitItemPosition % form x y w h for reader X CurrentBottom Width VerticalMeasure 3 mul /reshape Reader send /OldDisplayY /LabelY Reader send store /CurrentBottom CurrentBottom /ItemHeight Reader send add VerticalMeasure 2 div add % inter control spacing store % Adjust label and object position Display InitItemPosition % form x y w h for Display X CurrentBottom Width VerticalMeasure 3 mul /reshape Display send /OldDisplayY /LabelY Reader send store /CurrentBottom CurrentBottom /ItemHeight Reader send add VerticalMeasure add % inter control spacing store % now move the horizontal bar to correct location BorderLeft 1 sub CurrentBottom FrameWidth BorderRight sub BorderLeft sub 2 add /BorderBottom super send /reshape HScrollbar send /CurrentBottom CurrentBottom /ItemHeight Reader send add VerticalMeasure 2 div add % inter control spacing store end } def /PaintFrameControls { % - => - (Paint frame control areas) gsave /PaintFrameControls super send [Display Reader] { dup InitItemPosition {location ItemWidth ItemHeight reshape paint} exch send pause } forall grestore } def /InitItemPosition { % Display/Reader => - {/LabelY 0 store /ObjectY 0 store /ObjectX 0 store /LabelX 0 store} exch send } def /SetPrompt { % readerprompt => - Reader InitItemPosition { /ItemLabel exch store paint location ItemWidth ItemHeight reshape paint } Reader send } def /SetInput { % string => - Reader InitItemPosition { dup /ItemObject exch store dup /ItemValue exch store 21 inserttext % send ^U to clear line inserttext % insert string } Reader send } def /GetInput { % - => string /ItemValue Reader send % (reader contents) dup length string copy % return a copy of the string } def /DisplayString { % string => - (displays string in the display panel) /printstring Display send } def /DisplayFormat { % format argarray => - (formats args and displays in the display panel) /printf Display send } def /SetReaderNotifier { % [ ar0...argn /operator target] SetReaderNotifier => - /ReaderAction exch store } def /ReaderHandler{ % - => - ReaderAction null ne { ReaderAction % [args operator target] /ReaderAction null store % clear ReaderAction data aload pop send % reset reader's prompt and input after the action is performed DefaultPrompt SetPrompt () SetInput % [action] } if } def classend def % ControlWindow pause % -------------------------------------------------- % The above code needs some utilities to repair deficiencies % in other NeWS classes % define a subclass of LiteText that has a some deficiencies removed /MyLiteText LiteText [] classbegin % Original LINEKILL is will not work unless textstr and % textbuf are in synchronization. /LINEKILL { 0 0 moveto TextBuf false charpath TextFill setcolor fill TextColor setcolor /Left 0 def /Right 0 def } def /reshape { % x0 y0 reshape => - /TextY exch store /TextX exch store gsave TextCanvas setcanvas TextX TextY translate % TextFont setfont BeginTextEvent EndTextEvent grestore } def classend def % MyLiteText % Define a textitem that only notifies at the end of a line % LiteItems and Litetext are very poorly designed, so % some bugfixes: % 1. the current version of textitem (re)creates its % Litetext object on every reshape. This is wrong, it should % only do it once: corrected here. % 2. if the prompt is changed, the lite text item % does not properly reshape, and caret does not move % to correct position. /LineTextItem TextItem [] classbegin % define the characters that signal end of line /IsEOL { % char => boolean [10 13 27] % \n \r \e { % char char 1 index eq {pop true exit} if } forall dup true ne {pop false} if } def /inserttext { % str/char -> - TextBegin dup type /stringtype eq { {/inserttext self send} forall } { % char dup /inserttext ItemText send IsEOL {SetTextValue NotifyUser} if } ifelse TextEnd } def /reshape { % x y w h /ItemHeight exch def /ItemWidth exch def LabelSize /LabelHeight exch def /LabelWidth exch def ItemValue ItemFont ThingSize /ObjectHeight exch def /ObjectWidth exch def AdjustItemSize /ObjectWidth ItemWidth 2 ItemBorder mul sub def ObjectLoc /Right eq ObjectLoc /Left eq or { /ObjectWidth ObjectWidth LabelWidth sub ItemGap sub def } if CalcObj&LabelXY /ItemBaseline ObjectY ItemFont fontdescent add def % need to skip over the /reshape code of normal TextItem % ItemWidth ItemHeight /reshape LabeledItem supersend % Breaks in xnews! ItemWidth ItemHeight labeleditemreshape ItemFont setfont % this is so the text caret will be right! ItemText null eq { TextBegin /ItemText ItemCanvas ObjectX ItemBaseline ItemValue /new MyLiteText send store TextEnd } { ObjectX ItemBaseline /reshape ItemText send } ifelse } def /labeleditemreshape {/reshape load} LabeledItem send def classend def % LineTextItem pause end % systemdict