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...implement a filter mechanism for a stringgrid?
Autor: Schatzl Reinhard
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Tip Rating (8):  
     


// Filter Liste zum sichern des Gridinhalt
// save the original content
var
  
FilterList : TStringList;

// Filter setzen
// set the filter
procedure TForm1.SetFilter(ACol:Integer;Exp:String);
var
  
I,Counter:Integer;
begin
  
FilterList:=TStringList.Create;
  With Grid do
  begin
    
//Filterliste mit Gridinhalt füllen
    
For I := FixedRows To RowCount - 1 Do
      
FilterList.Add(Rows[I].Text);

    //Grid filtern
    
Counter:=FixedRows;
    For I := FixedRows To RowCount - 1 Do
    Begin
      If 
Cells[ACol,I] <> Exp Then
      Begin
         
Rows[I].Clear;
      end
      Else
      begin
         If 
Counter <> I Then
         Begin
           
Rows[Counter].Assign(Rows[I]);
           Rows[I].Clear;
         End;
         Inc(Counter);
      End;
    End;
    RowCount:=Counter;
  End;
end;

// Gridinhalt wiederherstellen
// restore the original content
procedure TForm1.RestoreFilter;
var
  
I:Integer;
begin
  With 
Grid do
  begin
    
RowCount:=FixedRows+FilterList.Count;
    For I:=0 To FilterList.Count - 1 Do
        
Rows[FixedRows+I].Text := FilterList.Strings[I];
  End;
  FilterList.Free;
end;


//Example
procedure TForm1.BtnSetFilterClick(Sender: TObject);
begin
  
//Grid nach Zellinhalt der markierten Zelle filtern
  
SetFilter(Grid.Col,Grid.Cells[Grid.Col,Grid.Row]);
end;

procedure TForm1.BtnRestoreFilterClick(Sender: TObject);
begin
  
RestoreFilter;
end;

 

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