TProgressBar.Max Property

Specifies the upper limit of the range of possible positions.

Pascal

property Max: Integer;

C++

__property int Max;

Description

Use Max along with the Min property to establish the range of possible positions a progress bar. When the process tracked by the progress bar is complete, the value of Position should equal Max.

C++ Examples:

Copy Code

/*
This example requires two ProgressBars, two labels and a
Memo.  The ProgressBar and the label captions are updated as
the mouse moves inside the Memo.
*/
void __fastcall TForm1::FormCreate(TObject *Sender)
{
  ProgressBar1->Min = 0;
  ProgressBar1->Max = Memo1->Width;
  ProgressBar2->Min = 0;
  ProgressBar1->Max = Memo1->Height;

}

void __fastcall TForm1::Memo1MouseMove(TObject *Sender, TShiftState Shift,
      int X, int Y)
{
  Label1->Caption = IntToStr(X);
  Label2->Caption = IntToStr(Y);
  ProgressBar1->Position = X;
  ProgressBar2->Position = Y;
}

Copy Code

/*
Reads through all records in the Customers table.
Updates the ProgressBar accordingly.
*/
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  ProgressBar1->Min = 0;
  ProgressBar1->Max = Customers->RecordCount;
  Customers->First();
  for (int i = ProgressBar1->Min; i <= ProgressBar1->Max; i++)
  {
    ProgressBar1->Position = i;
    Customers->Next();
    // do something with the current record
  }
}

void __fastcall TForm1::FormCreate(TObject *Sender)
{
  Customers = new TTable(Form1);
  Customers->Active = false; // The Table component must not be active
  Customers->DatabaseName = "DBDEMOS";
  Customers->TableType = ttParadox;
  Customers->TableName = "CustInfo";
  Customers->Active = False;
  if (Customers->Exists) // Don't overwrite an existing table
  {
    Customers->Close();
    Customers->DeleteTable();
  }
  // The Table component must not be active
  // First, describe the type of table and give
  // it a name
  // Next, describe the fields in the table
  Customers->FieldDefs->Clear();
  TFieldDef *pNewDef = Customers->FieldDefs->AddFieldDef();
  pNewDef->Name = "Field1";
  pNewDef->DataType = ftInteger;
  pNewDef->Required = true;
  pNewDef = Customers->FieldDefs->AddFieldDef();
  pNewDef->Name = "Field2";
  pNewDef->DataType = ftString;
  pNewDef->Size = 30;
  // Next, describe any indexes
  Customers->IndexDefs->Clear();
  /* the 1st index has no name because it is a Paradox primary key */
  Customers->IndexDefs->Add("","Field1", TIndexOptions() <<ixPrimary << ixUnique);
  Customers->IndexDefs->Add("Fld2Index","Field2", TIndexOptions() << ixCaseInsensitive);
  // Now that we have specified what we want, create the table
  Customers->CreateTable();
  Customers->Active = True;
  for (int i = 1; i <= 20; i++)
    Customers->AppendRecord(ARRAYOFCONST((i*111, i*222)));
  DS2->DataSet = Customers;
  DBGrid2->DataSource->DataSet = Customers;
  Customers->Active = True;
}

Delphi Examples:

Copy Code

{
This example requires two ProgressBars, two labels and a
Memo.  The ProgressBar and the label captions are updated as
the mouse moves inside the Memo.
}
procedure TForm1.FormCreate(Sender: TObject);
begin
  ProgressBar1.Min := 0;
  ProgressBar1.Max := Memo1.Width;
  ProgressBar2.Min := 0;
  ProgressBar1.Max := Memo1.Height;
end;

procedure TForm1.Memo1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
  Label1.Caption := InttoStr(X);
  Label2.Caption := InttoStr(Y);
  ProgressBar1.Position := X;
  ProgressBar2.Position := Y;
end;

Copy Code

{
Reads through all records in the Customers table.
Updates the ProgressBar accordingly.
}
procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
begin
  with ProgressBar1 do
  begin
    Min := 0;
    Max := Customers.RecordCount;
    Customers.First;
    for i := Min to Max do
    begin
      Position := i;
      Customers.Next;
      // do something with the current record
    end;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  i: Integer;
begin
  Customers:= TTable.Create(Form1);
  with Customers do
  begin
    DatabaseName := 'DBDEMOS';
    TableType := ttParadox;
    TableName := 'CustInfo';
    Active := False;
//  Overwrite any existing table
    if Customers.Exists then
    begin
      Customers.Close;
      Customers.DeleteTable;
    end;
    begin
      { The Table component must not be active }
      { First, describe the type of table and give }
      { it a name }
      { Next, describe the fields in the table }
      with FieldDefs do
      begin
        Clear;
        with AddFieldDef do
        begin
          Name := 'Field1';
          DataType := ftInteger;
          Required := True;
        end;
        with AddFieldDef do
        begin
          Name := 'Field2';
          DataType := ftString;
          Size := 30;
        end;
      end;
      { Next, describe any indexes }
      with IndexDefs do
      begin
        Clear;
        { The 1st index has no name because it is
        { a Paradox primary key }
        with AddIndexDef do
        begin
          Name := '';
          Fields := 'Field1';
          Options := [ixPrimary];
        end;
        with AddIndexDef do
        begin
          Name := 'Fld2Indx';
          Fields := 'Field2';
          Options := [ixCaseInsensitive];
        end;
      end;
      { Call the CreateTable method to create the table }
      CreateTable;
      Customers.Active:= True;
      for i := 1 to 100 do
        Customers.AppendRecord([i*111, i*222]);
    end;
  end;
  DS2.DataSet:= Customers;
  DBGrid2.DataSource.DataSet:= Customers;
  Customers.Active:= True;
end;