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unit gui_customgrid;
{$mode objfpc}{$H+}
{
TODO:
* Column text alignment needs to be implemented. Currently always Centre.
* AlternateColor for rows need to be implemented.
}
{.$Define DEBUG}
interface
uses
Classes,
SysUtils,
gfxbase,
fpgfx,
gui_basegrid;
type
// data object for grid columns
TfpgGridColumn = class(TObject)
private
FAlignment: TAlignment;
FTitle: string;
FWidth: integer;
public
constructor Create; virtual;
property Width: integer read FWidth write FWidth;
property Title: string read FTitle write FTitle;
property Alignment: TAlignment read FAlignment write FAlignment;
end;
TfpgCustomGrid = class(TfpgBaseGrid)
protected
FRowCount: integer;
FColumns: TList;
function GetColumns(AIndex: integer): TfpgGridColumn; virtual;
procedure DoDeleteColumn(ACol: integer); virtual;
procedure DoSetRowCount(AValue: integer); virtual;
function DoCreateColumnClass: TfpgGridColumn; virtual;
function GetColumnCount: integer; override;
procedure SetColumnCount(const AValue: integer); virtual;
function GetRowCount: integer; override;
procedure SetRowCount(const AValue: integer); virtual;
function GetColumnWidth(ACol: integer): integer; override;
procedure SetColumnWidth(ACol: integer; const AValue: integer); override;
function GetHeaderText(ACol: integer): string; override;
property RowCount: integer read GetRowCount write SetRowCount;
property ColumnCount: integer read GetColumnCount write SetColumnCount;
property Columns[AIndex: integer]: TfpgGridColumn read GetColumns;
// property AlternateColor: TColor read FAlternateColor write SetAlternateColor stored IsAltColorStored;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function AddColumn(ATitle: string; AWidth: integer): TfpgGridColumn; virtual;
end;
implementation
{ TfpgGridColumn }
constructor TfpgGridColumn.Create;
begin
Width := 64;
Title := '';
Alignment := taCenter;
end;
{ TfpgCustomGrid }
function TfpgCustomGrid.GetRowCount: integer;
begin
Result := FRowCount;
end;
function TfpgCustomGrid.GetColumns(AIndex: integer): TfpgGridColumn;
begin
if (AIndex < 0) or (AIndex > FColumns.Count-1) then
Result := nil
else
Result := TfpgGridColumn(FColumns[AIndex]);
end;
procedure TfpgCustomGrid.DoDeleteColumn(ACol: integer);
begin
TfpgGridColumn(FColumns.Items[ACol-1]).Free;
FColumns.Delete(ACol-1);
end;
procedure TfpgCustomGrid.DoSetRowCount(AValue: integer);
begin
// do nothing
end;
function TfpgCustomGrid.DoCreateColumnClass: TfpgGridColumn;
begin
Result := TfpgGridColumn.Create;
end;
function TfpgCustomGrid.GetColumnCount: integer;
begin
Result := FColumns.Count;
end;
procedure TfpgCustomGrid.SetColumnCount(const AValue: integer);
var
n: integer;
begin
n := FColumns.Count;
if (n = AValue) or (AValue < 0) then
Exit; //==>
if n < AValue then
begin
// adding columns
while n < AValue do
begin
AddColumn('', DefaultColWidth);
inc(n);
end;
end
else
begin
while n > AValue do
begin
DoDeleteColumn(n);
dec(n);
end;
end;
UpdateScrollBars;
RePaint;
end;
procedure TfpgCustomGrid.SetRowCount(const AValue: integer);
begin
if FRowCount = AValue then
Exit; //==>
FRowCount := AValue;
if FocusRow > FRowCount then
begin
FocusRow := FRowCount;
end;
DoSetRowCount(AValue); // could be implemented by descendants
RePaint;
end;
function TfpgCustomGrid.GetColumnWidth(ACol: integer): integer;
begin
if (ACol > 0) and (ACol <= ColumnCount) then
Result := TfpgGridColumn(FColumns[ACol-1]).Width
else
result := DefaultColWidth;
end;
procedure TfpgCustomGrid.SetColumnWidth(ACol: integer; const AValue: integer);
var
lCol: TfpgGridColumn;
begin
lCol := TfpgGridColumn(FColumns[ACol-1]);
if lCol.Width <> AValue then
begin
if AValue < 1 then
lCol.Width := 1
else
lCol.Width := AValue;
UpdateScrollBars;
Repaint;
end;
end;
function TfpgCustomGrid.GetHeaderText(ACol: integer): string;
begin
Result := TfpgGridColumn(FColumns[ACol-1]).Title;
end;
constructor TfpgCustomGrid.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FColumns := TList.Create;
ColumnCount := 5;
RowCount := 5;
end;
destructor TfpgCustomGrid.Destroy;
begin
while FColumns.Count > 0 do
begin
TfpgGridColumn(FColumns.Items[0]).Free;
FColumns.Delete(0);
end;
FColumns.Free;
inherited Destroy;
end;
function TfpgCustomGrid.AddColumn(ATitle: string; AWidth: integer): TfpgGridColumn;
begin
Result := DoCreateColumnClass;
Result.Title := ATitle;
Result.Width := AWidth;
FColumns.Add(Result);
UpdateScrollBars;
RePaint;
end;
end.
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