custypeform.pas

功能全面的商业财会系统源码,清晰,很有参考价值.扩展性强.

unit CusTypeForm;

interface

uses Windows, Messages, SysUtils, Classes, Graphics, Forms, Dialogs, Controls, StdCtrls,
  Buttons, ComCtrls, ExtCtrls, Mask, DBCtrls, DB, DBTables, Menus, BDE;

type
  TfrmCusType = class(TForm)
    Panel1: TPanel;
    dsCusType: TDataSource;
    Panel3: TPanel;
    Panel2: TPanel;
    Panel4: TPanel;
    btnOK: TButton;
    btnCancel: TButton;
    PageControl1: TPageControl;
    TabSheet1: TTabSheet;
    Label1: TLabel;
    editTypeName: TDBEdit;
    tblCusType: TTable;
    tblCusTypeCustomerTypeID: TAutoIncField;
    tblCusTypeTypeName: TStringField;
    qryLastID: TQuery;
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure dsCusTypeDataChange(Sender: TObject; Field: TField);
    procedure FormShow(Sender: TObject);
    procedure Panel2DblClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormKeyPress(Sender: TObject; var Key: Char);
    procedure dsCusTypeUpdateData(Sender: TObject);
    procedure btnOKClick(Sender: TObject);
    procedure btnCancelClick(Sender: TObject);
    procedure tblCusTypeBeforePost(DataSet: TDataSet);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  frmCusType: TfrmCusType;

implementation

uses CusTypesForm, BS1Form;

var
  intClientHeight, intClientWidth: Integer;

{$R *.DFM}

procedure TfrmCusType.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  if tblCusType.State in [dsInsert, dsEdit] then btnOKClick(sender);
  Action := caFree;
end;

procedure TfrmCusType.dsCusTypeDataChange(Sender: TObject;
  Field: TField);
begin
  if (tblCusTypeCustomerTypeID.AsVariant = null) and (tblCusTypeTypeName.Value = '') then self.Caption := 'New Customer Type'
  else self.Caption := tblCusTypeTypeName.value;
end;

procedure TfrmCusType.FormShow(Sender: TObject);
begin
  PageControl1.ActivePage := Tabsheet1;
  editTypeName.setfocus;
end;

procedure TfrmCusType.Panel2DblClick(Sender: TObject);
begin
  ClientHeight := intClientHeight;   //Resize form.
  ClientWidth := intClientWidth;
end;

procedure TfrmCusType.FormCreate(Sender: TObject);
begin
  tblCusType.DatabaseName := strDatabaseName;
  qryLastID.DatabaseName := strDatabaseName;
  tblCusType.Active := true;

  if FontFactor <> 1 then begin   //If using large fonts, resize form.
    ClientHeight := Trunc(ClientHeight*FontFactor);
    ClientWidth := Trunc(ClientWidth*FontFactor);
    PageControl1.TabWidth := Trunc(PageControl1.TabWidth*FontFactor);
  end;  
  intClientHeight := ClientHeight;   //Store form size.
  intClientWidth := ClientWidth;
end;

procedure TfrmCusType.FormKeyPress(Sender: TObject; var Key: Char);
begin
  if key = #13 then begin   //Enter key: advance to next control.
    if (ActiveControl.ClassType <> TDBMemo) and (ActiveControl.ClassType <> TDBLookupCombobox) then begin
      Key := #0;
      Perform(WM_NEXTDLGCTL, 0, 0);
    end else if (ActiveControl.ClassType = TDBLookupComboBox) and (TDBLookupComboBox(ActiveControl).ListVisible = false) then begin
      Key := #0;
      Perform(WM_NEXTDLGCTL, 0, 0);
    end;
  end;
end;

procedure TfrmCusType.dsCusTypeUpdateData(Sender: TObject);
begin
  if tblCusTypeTypeName.AsString = '' then begin
    with editTypeName do begin Show; SetFocus; end;
    raise(exception.create('Field ' + '''Type Name''' + ' must have a value'));
  end;
end;

procedure TfrmCusType.btnOKClick(Sender: TObject);
begin
  if tblCusType.State in [dsInsert, dsEdit] then begin
    try tblCusType.post; DbiSaveChanges(tblCusType.handle);
    except
      on E: EDBEngineError do
        if E.Errors[E.ErrorCount - 1].ErrorCode = 9729 then begin   //Key violation (key already exists).
          with editTypeName do begin Show; SetFocus; end;
          raise(exception.create('Customer Type already exists'));
        end else raise;
    end;
    try
      frmCusTypes.tblCusType.refresh;
      frmCusTypes.tblCusType.Locate('CustomerTypeID', tblCusTypeCustomerTypeID.AsInteger, []);
      frmCusTypes.DBGrid1.Setfocus;
    except; end;
  end;
  Close;
end;

procedure TfrmCusType.btnCancelClick(Sender: TObject);
begin
  tblCusType.cancel;
  Close;
end;

procedure TfrmCusType.tblCusTypeBeforePost(DataSet: TDataSet);
begin
  if tblCusType.state = dsInsert then begin
    qryLastID.close;
    qryLastID.open;
    with qryLastID.Fields[0] do
      if IsNull then tblCusTypeCustomerTypeID.value := 1
      else tblCusTypeCustomerTypeID.value := AsInteger + 1;
  end;
end;

end.