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- { Turbo Pascal removable window system }
- { For further documentation see PC Tech Journal, February 1985. }
- { Requirements: IBM PC or close compatible. }
- { Screen must be in text mode, on page 1, }
- { either mono or color card. }
- { Call INITWIN before calling MKWIN or RMWIN. }
- const maxwin = 5; { maximum number of windows open at once }
-
- type imagetype = array [1..4096] of char;
- windimtype = record
- x1,y1,x2,y2: integer
- end;
- var
- win: { Global variable package }
- record
- dim: windimtype; { Current window dimensions }
- depth: integer;
- stack: array[1..maxwin] of
- record
- image: imagetype; { Saved screen image }
- dim: windimtype; { Saved window dimensions }
- x,y: integer { Saved cursor position }
- end
- end;
-
- crtmode: byte absolute $0040:$0049;
- crtwidth: byte absolute $0040:$004A;
- monobuffer: imagetype absolute $B000:$0000;
- colorbuffer: imagetype absolute $B800:$0000;
-
- procedure initwin;
- { Records initial window dimensions }
- begin
- with win.dim do
- begin x1:=1; y1:=1; x2:=crtwidth; y2:=25 end;
- win.depth:=0
- end;
-
- procedure boxwin(x1,y1,x2,y2:integer);
- { Draws a box, fills it with blanks, and makes it the current }
- { window. Dimensions given are for the box; actual window is }
- { one unit smaller in each direction. }
- { This routine can be used separately from the rest of the }
- { removable window package. }
- var x,y: integer;
- begin
- window(1,1,80,25);
-
- { Top }
- gotoxy(x1,y1);
- write(chr(213));
- for x:=x1+1 to x2-1 do write(chr(205));
- write(chr(184));
-
- { Sides }
- for y:=y1+1 to y2-1 do
- begin
- gotoxy(x1,y);
- write(chr(179), ' ':x2-x1-1, chr(179))
- end;
-
- { Bottom }
- gotoxy(x1,y2);
- write(chr(212));
- for x:=x1+1 to x2-1 do write(chr(205));
- write(chr(190));
-
- { Make it the current window }
- window(x1+1,y1+1,x2-1,y2-1);
- gotoxy(1,1)
- end;
-
- procedure mkwin(x1,y1,x2,y2:integer);
- { Create a removable window }
-
- begin
- { Increment stack pointer }
- with win do depth:=depth+1;
- if win.depth>maxwin then
- begin
- writeln(^G,' Windows nested too deep ');
- halt
- end;
-
- { Save contents of screen }
- if crtmode = 7 then
- win.stack[win.depth].image := monobuffer
- else
- win.stack[win.depth].image := colorbuffer;
-
- win.stack[win.depth].dim := win.dim;
- win.stack[win.depth].x := wherex;
- win.stack[win.depth].y := wherey;
-
- { Create the window }
- boxwin(x1,y1,x2,y2);
- win.dim.x1 := x1+1;
- win.dim.y1 := y1+1; { Allow for margins }
- win.dim.x2 := x2-1;
- win.dim.y2 := y2-1;
-
- end;
-
- procedure rmwin;
- { Remove the most recently created removable window }
- { Restore screen contents, window dimensions, and }
- { position of cursor. }
- begin
- if crtmode = 7 then
- monobuffer := win.stack[win.depth].image
- else
- colorbuffer := win.stack[win.depth].image;
- with win do
- begin
- dim := stack[depth].dim;
- window(dim.x1,dim.y1,dim.x2,dim.y2);
- gotoxy(stack[depth].x,stack[depth].y);
- depth := depth - 1
- end
- end;