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unit elastictabstops;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, fpg_memo;
type
TMutableInteger = class(TObject)
public
Value: integer;
end;
TETLine = class(TObject)
public
StartPos: integer;
EndPos: integer;
NumTabs: integer;
constructor Create;
end;
TETTabstop = class(TObject)
public
TextWidthPix: integer;
WidestWidthPix: TMutableInteger;
StartPos: integer;
EndPos: integer;
EndsInTab: boolean;
constructor Create;
end;
TElasticTabstopsDocFilter = class(TObject)
private
FMemo: TfpgMemo;
FTabMultiples: integer;
FTabMinimum: integer;
FTabPadding: integer;
FMaxTabstops: integer;
protected
property Memo: TfpgMemo read FMemo;
function CalcTabWidth(TextWidthInTab: integer): integer;
public
constructor Create(AMemo: TfpgMemo);
procedure StretchTabstops;
property MaxTabstops: integer read FMaxTabstops write FMaxTabstops;
end;
implementation
{ TETLine }
constructor TETLine.Create;
begin
StartPos := 0;
EndPos := 0;
NumTabs := 0;
end;
{ TETTabstop }
constructor TETTabstop.Create;
begin
TextWidthPix := 0;
// WidestWidthPix := 0;
StartPos := 0;
EndPos := 0;
EndsInTab := False;
end;
{ TElasticTabstopsDocFilter }
function TElasticTabstopsDocFilter.CalcTabWidth(TextWidthInTab: integer): integer;
var
w: integer;
begin
w := ((TextWidthInTab div FTabMultiples) + 1) * FTabMultiples;
if w < FTabMinimum then
w := FTabMinimum;
Inc(w, FTabPadding);
Result := w;
end;
constructor TElasticTabstopsDocFilter.Create(AMemo: TfpgMemo);
begin
FMemo := AMemo;
// tabstops are at least 32 pixels plus 8 pixels of padding
FTabMultiples := 1; // must be greater than 0
FTabMinimum := 32;
FTabPadding := 8;
FMaxTabstops := 32; // tabs per line
end;
procedure TElasticTabstopsDocFilter.StretchTabstops;
var
linecount: integer;
lines: array of TETLine;
grid: array of array of TETTabstop;
l: integer;
t: integer;
c: integer;
lineStart: integer;
lineEnd: integer;
lineText: string;
tabs_on_line: integer;
textWidthInTab: integer;
theWidestWidthPix: TMutableInteger;
maxWidth: integer;
accTabStop: integer;
begin
linecount := FMemo.Lines.Count;
SetLength(lines, linecount);
SetLength(grid, linecount, FMaxTabstops);
// initialise array
for l := 0 to linecount - 1 do // for each line
begin
lines[l] := TETLine.Create;
for t := 0 to MaxTabstops - 1 do // for each column
grid[l, t] := TETTabstop.Create;
end;
// get width of text in cells
for l := 0 to linecount - 1 do // for each line
begin
{$Note What must these be??? }
lineStart := 0;
lineEnd := 0;
lines[l].StartPos := lineStart;
lines[l].EndPos := lineEnd;
lineText := FMemo.Lines[l];
tabs_on_line := 0;
textWidthInTab := 0;
for c := 1 to Length(lineText) do // for each char in current line
begin
if c = Length(lineText) then
begin
grid[l, tabs_on_line].EndsInTab := False;
grid[l, tabs_on_line].EndPos := lineStart + c;
textWidthInTab := 0;
end
else if lineText[c] = #9 then
begin
grid[l, tabs_on_line].EndsInTab := True;
grid[l, tabs_on_line].EndPos := lineStart + c;
grid[l, tabs_on_line].TextWidthPix := CalcTabWidth(textWidthInTab);
Inc(tabs_on_line, 1);
grid[l, tabs_on_line].StartPos := lineStart + c + 1;
Inc(lines[l].NumTabs, 1);
textWidthInTab := 0;
end
else
Inc(textWidthInTab, FMemo.Canvas.Font.TextWidth(lineText[c]));
end; { for c }
end; { for l }
// find columns blocks and stretch to fit the widest cell
for t := 0 to MaxTabstops - 1 do // for each column
begin
// All tabstops in column block point to same number. You change one, and
// they all change
theWidestWidthPix := TMutableInteger.Create; // reference
theWidestWidthPix.Value := 0;
maxWidth := 0;
for l := 0 to linecount - 1 do // for each line
begin
if grid[l, t].EndsInTab then
begin
grid[l, t].WidestWidthPix := theWidestWidthPix; // copy reference
if grid[l, t].TextWidthPix < maxWidth then
grid[l, t].TextWidthPix := maxWidth
else
begin
maxWidth := grid[l, t].TextWidthPix;
theWidestWidthPix.Value := maxWidth;
end;
end
else // end column block
begin
theWidestWidthPix := TMutableInteger.Create; // new reference
theWidestWidthPix.Value := 0;
maxWidth := 0;
end; { if/else }
end; { for l }
end;
// apply tabstop sizes to the text
for l := 0 to linecount - 1 do // for each line
begin
// accumulate tabstop widths
accTabStop := 0;
for t := 0 to lines[l].NumTabs - 1 do
begin
Inc(accTabStop, grid[l, t].WidestWidthPix.Value);
grid[l, t].TextWidthPix := accTabStop;
end;
// SetBlocksTabStops(grid[l], lines[l].NumTabs);
// Delete();
// FMemo.Lines[l];
// FMemo.Invalidate;
end;
end;
end.
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