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{
*****************************************************************************
This file is part of LazUtils.
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
Author: Jesus Reyes
Abstract:
A dynamic 2-dimensional array of Pointers.
Used for TCustomGrid, TDrawGrid and TStringGrid.
}
unit DynamicArray;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
type
EArray=Class(Exception);
TOnNotifyItem = Procedure(Sender: TObject; Col,Row: integer; Var Item: Pointer) of Object;
TOnExchangeItem = procedure (Sender: TObject; Index, WithIndex: Integer) of Object;
TPointerPointerArray=Class
private
FCols: TFpList;
FOnDestroyItem: TOnNotifyItem;
FOnNewItem: TonNotifyItem;
function Getarr(Col, Row: Integer): Pointer;
procedure Setarr(Col, Row: Integer; const AValue: Pointer);
procedure ClearCol(L: TFpList; Col: Integer);
procedure Aumentar_Rows(col,Rows: Integer; L: TFpList);
procedure DestroyItem(Col,Row: Integer; P: Pointer);
public
constructor Create;
destructor Destroy; override;
procedure SetLength(Cols,Rows: Integer);
procedure DeleteColRow(IsColumn: Boolean; Index: Integer);
procedure MoveColRow(IsColumn:Boolean; FromIndex, ToIndex: Integer);
procedure ExchangeColRow(IsColumn:Boolean; Index, WithIndex: Integer);
procedure Clear;
Property Arr[Col,Row: Integer]: Pointer read GetArr write SetArr; default;
Property OnDestroyItem: TOnNotifyItem read FOnDestroyItem write FOnDestroyItem;
Property OnNewItem: TOnNotifyItem read FOnNewItem write FOnNewItem;
end;
implementation
{ TPointerPointerArray }
function TPointerPointerArray.Getarr(Col, Row: Integer): Pointer;
begin
// Checar dimensiones
Result := TFpList(FCols[Col])[Row];
end;
procedure TPointerPointerArray.Setarr(Col, Row: Integer; const AValue: Pointer);
begin
// Checar dimensiones
TFpList(FCols[Col])[Row] := AValue;
end;
procedure TPointerPointerArray.ClearCol(L: TFpList; Col: Integer);
var
j: Integer;
begin
if L<>nil then begin
for j:=0 to L.Count-1 do DestroyItem(Col,J, L[J]);
L.Clear;
end;
end;
procedure TPointerPointerArray.Clear;
var
i: Integer;
begin
{$Ifdef dbgMem}DebugLn('TArray.Clear');{$endif}
for i:=0 to FCols.Count-1 do begin
ClearCol(TFpList(FCols[i]), i);
TFpList(FCols[i]).Free;
end;
FCols.Clear;
end;
constructor TPointerPointerArray.Create;
begin
inherited Create;
FCols := TFpList.Create;
end;
destructor TPointerPointerArray.Destroy;
begin
{$Ifdef dbgMem}DebugLn('TArray.Destroy FCols.Count=',dbgs(FCols.Count));{$endif}
Clear;
FCols.free;
inherited Destroy;
end;
procedure TPointerPointerArray.Aumentar_Rows(col,rows: Integer; L: TFpList);
var
i,j: Integer;
P: Pointer;
begin
//DebugLn('TArray.Aumentar_Rows: Col=',Col,' Rows=',Rows);
i:=L.Count;
j:=Rows-L.Count;
while j>0 do begin
P:=nil;
if Assigned(OnNewItem) Then OnNewItem(Self, col, i, P);
L.Add(P);
dec(j);
inc(i);
end;
end;
procedure TPointerPointerArray.DestroyItem(Col, Row: Integer; P: Pointer);
begin
if (P<>nil)And Assigned(OnDestroyItem) then OnDestroyItem(Self, Col, Row, P);
end;
procedure TPointerPointerArray.SetLength(Cols, Rows: Integer);
var
i,j: integer;
L: TFpList;
//P: Pointer;
Begin
{$IfDef DbgMem}DebugLn('TArray.SetLength: Cols=',dbgs(Cols),' Rows=',dbgs(Rows));{$Endif}
//
// Ajustar columnas
//
if FCols.Count>Cols then begin
// Hay mas columnas de las que debe.
// Destruir las columnas innecesarias
for i:=Cols to fCols.Count-1 do begin
L:=TFpList(FCols[i]);
ClearCol(L, i);
FreeAndNil(L);
end;
end;
FCols.Count:=Cols;
//
// Ajustar Renglones
//
for i:=0 to fCols.Count-1 do begin
L:=TFpList(FCols[i]);
if L=nil then L:=TFpList.Create;
if L.Count>Rows then begin
for j:=Rows to L.Count-1 do DestroyItem(i,j,L[j]);
L.Count:=Rows;
end;
Aumentar_Rows(i, Rows, L);
FCols[i]:=L;
end;
end;
procedure TPointerPointerArray.DeleteColRow(IsColumn: Boolean; Index: Integer);
var
i: Integer;
L: TFpList;
begin
if IsColumn then begin
{$Ifdef dbgMem}DebugLn('TArray.DeleteColRow Col=',dbgs(Index));{$endif}
L:=TFpList(FCols[Index]);
If L<>nil then begin
ClearCol(L, Index);
FCols.Delete(Index);
L.Free;
end;
end else begin
{$Ifdef dbgMem}DebugLn('TArray.DeleteColRow Row=',dbgs(Index));{$endif}
for i:=0 to fCols.Count - 1 do begin
L:=TFpList(fcols[i]);
if L<>nil then begin
DestroyItem(i, Index, L[Index]);
L.Delete(Index);
end;
end;
end;
end;
procedure TPointerPointerArray.MoveColRow(IsColumn: Boolean; FromIndex, ToIndex: Integer);
var
i: Integer;
begin
If IsColumn then begin
FCols.Move(FromIndex, ToIndex);
end else begin
for i:=0 to FCols.Count-1 do
TFpList(Fcols[i]).Move(FromIndex,ToIndex);
end;
end;
procedure TPointerPointerArray.ExchangeColRow(IsColumn: Boolean; Index, WithIndex: Integer);
var
i: Integer;
begin
if IsColumn then begin
FCols.Exchange(Index, WithIndex);
end else begin
for i:=0 to FCols.Count-1 do
TFpList(FCols[i]).Exchange(Index, WithIndex);
end;
end;
end.
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