fr_utils.pas

FreeReport 2.34 consists of the report engine, designer and previewer, with capabilities comparable

{*****************************************}
{                                         }
{             FastReport v2.3             }
{            Various routines             }
{                                         }
{  Copyright (c) 1998-99 by Tzyganenko A. }
{                                         }
{*****************************************}

unit FR_Utils;

interface

{$I FR.inc}

uses
  SysUtils, Windows, Messages, Classes, Graphics, Controls,
  FR_DBRel, Forms, StdCtrls, ClipBrd, Menus, FR_Class;


procedure frReadMemo(Stream: TStream; l: TStrings);
procedure frReadMemo22(Stream: TStream; l: TStrings);
procedure frWriteMemo(Stream: TStream; l: TStrings);
function frReadString(Stream: TStream): String;
function frReadString22(Stream: TStream): String;
procedure SaveToFR3Stream(Report: TfrReport; Stream: TStream);
function StrToXML(const s: String): String;
function frStreamToString(Stream: TStream): String;
{$IFDEF FREEREP2217READ}
function frReadString2217(Stream: TStream): String;
{$ENDIF}
procedure frWriteString(Stream: TStream; s: String);
procedure frEnableControls(c: Array of TControl; e: Boolean);
function frControlAtPos(Win: TWinControl; p: TPoint): TControl;
function frGetDataSet(ComplexName: String): TfrTDataSet;
procedure frGetDataSetAndField(ComplexName: String;
  var DataSet: TfrTDataSet; var Field: TfrTField);
function frGetFontStyle(Style: TFontStyles): Integer;
function frSetFontStyle(Style: Integer): TFontStyles;
function frFindComponent(Owner: TComponent; Name: String): TComponent;
procedure frGetComponents(Owner: TComponent; ClassRef: TClass;
  List: TStrings; Skip: TComponent);
function frGetWindowsVersion: String;



implementation

uses FR_DSet, Printers;


function frSetFontStyle(Style: Integer): TFontStyles;
begin
  Result := [];
  if (Style and $1) <> 0 then Result := Result + [fsItalic];
  if (Style and $2) <> 0 then Result := Result + [fsBold];
  if (Style and $4) <> 0 then Result := Result + [fsUnderLine];
end;

function frGetFontStyle(Style: TFontStyles): Integer;
begin
  Result := 0;
  if fsItalic in Style then Result := Result or $1;
  if fsBold in Style then Result := Result or $2;
  if fsUnderline in Style then Result := Result or $4;
end;

procedure RemoveQuotes(var s: String);
begin
  if (s[1] = '"') and (s[Length(s)] = '"') then
    s := Copy(s, 2, Length(s) - 2);
end;

procedure frReadMemo(Stream: TStream; l: TStrings);
var
  s: String;
  b: Byte;
  n: Word;
begin
  l.Clear;
  Stream.Read(n, 2);
  if n > 0 then
    repeat
      Stream.Read(n, 2);
      SetLength(s, n);
      Stream.Read(s[1], n);
      l.Add(s);
      Stream.Read(b, 1);
    until b = 0
  else
    Stream.Read(b, 1);
end;

procedure frWriteMemo(Stream: TStream; l: TStrings);
var
  s: String;
  i: Integer;
  n: Word;
  b: Byte;
begin
  n := l.Count;
  Stream.Write(n, 2);
  for i := 0 to l.Count - 1 do
  begin
    s := l[i];
    n := Length(s);
    Stream.Write(n, 2);
    Stream.Write(s[1], n);
    b := 13;
    if i <> l.Count - 1 then Stream.Write(b, 1);
  end;
  b := 0;
  Stream.Write(b, 1);
end;

function frReadString(Stream: TStream): String;
var
  s: String;
  n: Word;
  b: Byte;
begin
  Stream.Read(n, 2);
  SetLength(s, n);
  Stream.Read(s[1], n);
  Stream.Read(b, 1);
  Result := s;
end;

procedure frWriteString(Stream: TStream; s: String);
var
  b: Byte;
  n: Word;
begin
  n := Length(s);
  Stream.Write(n, 2);
  Stream.Write(s[1], n);
  b := 0;
  Stream.Write(b, 1);
end;

procedure frReadMemo22(Stream: TStream; l: TStrings);
var
  s: String;
  i: Integer;
  b: Byte;
begin
  SetLength(s, 4096);
  l.Clear;
  i := 1;
  repeat
    Stream.Read(b,1);
    if (b = 13) or (b = 0) then
    begin
      SetLength(s, i - 1);
      if not ((b = 0) and (i = 1)) then l.Add(s);
      SetLength(s, 4096);
      i := 1;
    end
    else if b <> 0 then
    begin
      s[i] := Chr(b);
      Inc(i);
      if i > 4096 then
        SetLength(s, Length(s) + 4096);
    end;
  until b = 0;
end;

function frReadString22(Stream: TStream): String;
var
  s: String;
  i: Integer;
  b: Byte;
begin
  SetLength(s, 4096);
  i := 1;
  repeat
    Stream.Read(b, 1);
    if b = 0 then
      SetLength(s, i - 1)
    else
    begin
      s[i] := Chr(b);
      Inc(i);
      if i > 4096 then
        SetLength(s, Length(s) + 4096);
    end;
  until b = 0;
  Result := s;
end;

{$IFDEF FREEREP2217READ}
function frReadString2217(Stream: TStream): String;
var
  I: Integer;
begin
  Stream.ReadBuffer(I, SizeOf(I));
  SetLength(Result, I);
  Stream.ReadBuffer(PChar(Result)^, I);
end;
{$ENDIF}

type
  THackWinControl = class(TWinControl)
  end;

procedure frEnableControls(c: Array of TControl; e: Boolean);
const
  Clr1: Array[Boolean] of TColor = (clGrayText,clWindowText);
  Clr2: Array[Boolean] of TColor = (clBtnFace,clWindow);
var
  i: Integer;
begin
  for i := Low(c) to High(c) do
    if c[i] is TLabel then
      with c[i] as TLabel do
      begin
        Font.Color := Clr1[e];
        Enabled := e;
      end
    else if c[i] is TWinControl then
      with THackWinControl(c[i]) do
      begin
        Color := Clr2[e];
        Enabled := e;
      end;
end;

function frControlAtPos(Win: TWinControl; p: TPoint): TControl;
var
  i: Integer;
  c: TControl;
  p1: TPoint;
begin
  Result := nil;
  with Win do
  begin
    for i := ControlCount - 1 downto 0 do
    begin
      c := Controls[i];
      if c.Visible and PtInRect(Rect(c.Left, c.Top, c.Left + c.Width, c.Top + c.Height), p) then
        if (c is TWinControl) and (csAcceptsControls in c.ControlStyle) and
           (TWinControl(c).ControlCount > 0) then
        begin
          p1 := p;
          Dec(p1.X, c.Left); Dec(p1.Y, c.Top);
          c := frControlAtPos(TWinControl(c), p1);
          if c <> nil then
          begin
            Result := c;
            Exit;
          end;
        end
        else
        begin
          Result := c;
          Exit;
        end;
    end;
  end;
end;

function frGetDataSet(ComplexName: String): TfrTDataSet;
begin
  Result := TfrTDataSet(frFindComponent(CurReport.Owner, ComplexName));
end;

procedure frGetDataSetAndField(ComplexName: String; var DataSet: TfrTDataSet;
  var Field: TfrTField);
var
  n: Integer;
  f: TComponent;
  s1, s2, s3: String;
begin
  Field := nil;
  f := CurReport.Owner;
  n := Pos('.', ComplexName);
  if n <> 0 then
  begin
    s1 := Copy(ComplexName, 1, n - 1);        // table name
    s2 := Copy(ComplexName, n + 1, 255);      // field name
    if Pos('.', s2) <> 0 then                 // module name present
    begin
      s3 := Copy(s2, Pos('.', s2) + 1, 255);
      s2 := Copy(s2, 1, Pos('.', s2) - 1);
      f := FindGlobalComponent(s1);
      if f <> nil then
      begin
        DataSet := TfrTDataSet(f.FindComponent(s2));
        RemoveQuotes(s3);
        if DataSet <> nil then
          Field := TfrTField(DataSet.FindField(s3));
      end;
    end
    else
    begin
      DataSet := TfrTDataSet(frFindComponent(f, s1));
      RemoveQuotes(s2);
      if DataSet <> nil then
        Field := TfrTField(DataSet.FindField(s2));
    end;
  end
  else if DataSet <> nil then
  begin
    RemoveQuotes(ComplexName);
    Field := TfrTField(DataSet.FindField(ComplexName));
  end;
end;

function frFindComponent(Owner: TComponent; Name: String): TComponent;
var
  n: Integer;
  s1, s2: String;
begin
  Result := nil;
  n := Pos('.', Name);
  try
    if n = 0 then
      Result := Owner.FindComponent(Name)
    else
    begin
      s1 := Copy(Name, 1, n - 1);        // module name
      s2 := Copy(Name, n + 1, 255);      // component name
      Owner := FindGlobalComponent(s1);
      if Owner <> nil then
        Result := Owner.FindComponent(s2);
    end;
  except
    on Exception do
      raise EClassNotFound.Create('悟耋蝰蜮箦