taxesform.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 TaxesForm;

interface

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

type
  TfrmTaxes = class(TForm)
    Panel1: TPanel;
    MainMenu1: TMainMenu;
    tblTax: TTable;
    dsTax: TDataSource;
    DBGrid1: TDBGrid;
    mnuFile: TMenuItem;
    mnuView: TMenuItem;
    mnuHelp: TMenuItem;
    mnuRefresh: TMenuItem;
    mnuTaxesHelp: TMenuItem;
    mnuPrint: TMenuItem;
    N2: TMenuItem;
    mnuExit: TMenuItem;
    Bevel1: TBevel;
    btnNew: TSpeedButton;
    btnEdit: TSpeedButton;
    btnDelete: TSpeedButton;
    mnuRecords: TMenuItem;
    mnuNew: TMenuItem;
    mnuEdit: TMenuItem;
    mnuDelete: TMenuItem;
    PopupMenu1: TPopupMenu;
    popNew: TMenuItem;
    popEdit: TMenuItem;
    popDelete: TMenuItem;
    tblTaxTaxID: TAutoIncField;
    tblTaxTaxName: TStringField;
    tblTaxRate: TFloatField;
    tblTaxTaxCode: TStringField;
    tblTaxTaxDescription: TStringField;
    tblCustomer: TTable;
    tblCustomerTax1ID: TIntegerField;
    tblCustomerTax2ID: TIntegerField;
    tblARInv: TTable;
    tblARInvTax1ID: TIntegerField;
    tblARInvTax2ID: TIntegerField;
    procedure mnuRefreshClick(Sender: TObject);
    procedure tblTaxBeforeDelete(DataSet: TDataSet);
    procedure FormCreate(Sender: TObject);
    procedure Panel1DblClick(Sender: TObject);
    procedure DBGrid1KeyPress(Sender: TObject; var Key: Char);
    procedure FormShow(Sender: TObject);
    procedure mnuNewClick(Sender: TObject);
    procedure mnuEditClick(Sender: TObject);
    procedure mnuDeleteClick(Sender: TObject);
    procedure mnuExitClick(Sender: TObject);
    procedure FormResize(Sender: TObject);
    procedure mnuPrintClick(Sender: TObject);
    procedure mnuTaxesHelpClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  frmTaxes: TfrmTaxes;

implementation

uses BS1Form, TaxForm, TaxesReport;

var
  intClientHeight, intClientWidth: Integer;
  OldWindowState: TWindowState;

{$R *.DFM}

procedure TfrmTaxes.mnuRefreshClick(Sender: TObject);
begin
  tblTax.refresh;
end;

procedure TfrmTaxes.tblTaxBeforeDelete(DataSet: TDataSet);
begin
  if MessageDlg('Delete ' + '''' + tblTaxTaxName.AsString + '''' + '?',mtConfirmation,mbOKCancel,0) <> mrOK then raise(EAbort.create(''));   //Silent Exception: "abort;" replaced by "raise etc" since abort conflicts with BDE (required by DbiSaveChanges).

  tblCustomer.Active := true;
  if tblCustomer.Locate('Tax1ID', tblTaxTaxID.value, []) = true then raise(Exception.Create('Unable to delete tax ' + '''' + tblTaxTaxName.AsString + '''' + '...' + #13 + 'Customer(s) exist for this tax'));
  if tblCustomer.Locate('Tax2ID', tblTaxTaxID.value, []) = true then raise(Exception.Create('Unable to delete tax ' + '''' + tblTaxTaxName.AsString + '''' + '...' + #13 + 'Customer(s) exist for this tax'));

  tblARInv.Active := true;
  if tblARInv.Locate('Tax1ID', tblTaxTaxID.value, []) = true then raise(Exception.Create('Unable to delete tax ' + '''' + tblTaxTaxName.AsString + '''' + '...' + #13 + 'Invoice(s) exist for this tax'));
  if tblARInv.Locate('Tax2ID', tblTaxTaxID.value, []) = true then raise(Exception.Create('Unable to delete tax ' + '''' + tblTaxTaxName.AsString + '''' + '...' + #13 + 'Invoice(s) exist for this tax'));
end;

procedure TfrmTaxes.FormCreate(Sender: TObject);
var
  x: integer;
begin
  tblTax.DatabaseName := strDatabaseName;
  tblCustomer.DatabaseName := strDatabaseName;
  tblARInv.DatabaseName := strDatabaseName;
  tblTax.Active := true;
  //tblCustomer.Active := true;   ...pospone until required (delete).
  //tblARInv.Active := true;   ...pospone until required (delete).

  if FontFactor <> 1 then begin   //If using large fonts, resize grid columns.
    intClientWidth := Trunc(20*FontFactor) + DBGrid1.Columns.Count - 1;   //Scrollbar + grid lines.
    for x := 0 to DBGrid1.Columns.Count - 1 do begin
      DBGrid1.Columns[x].width := Trunc(DBGrid1.Columns[x].width*FontFactor);
      intClientWidth := intClientWidth + DBGrid1.Columns[x].width;
    end;
    ClientWidth := intClientWidth;
  end;  
  intClientHeight := ClientHeight;   //Store form size.
  intClientWidth := ClientWidth;
end;

procedure TfrmTaxes.Panel1DblClick(Sender: TObject);
begin
  ClientHeight := intClientHeight;   //Resize form.
  ClientWidth := intClientWidth;
end;

procedure TfrmTaxes.DBGrid1KeyPress(Sender: TObject; var Key: Char);
begin
  if key = #13 then begin
    mnuEditClick(Sender);
    Key := #0;   //Cancel Enter key.
  end;
end;

procedure TfrmTaxes.FormShow(Sender: TObject);
begin
  DBGrid1.setfocus;
  tblTax.First;   //Reset grid to start at 1st record.
end;

procedure TfrmTaxes.mnuNewClick(Sender: TObject);
begin
  screen.cursor := crHourglass;
  application.createform (TfrmTax,frmTax);
  frmTax.tblTax.Insert;
  frmTax.Show;
  screen.cursor := crDefault;
end;

procedure TfrmTaxes.mnuEditClick(Sender: TObject);
begin
  screen.cursor := crHourglass;
  application.createform (TfrmTax,frmTax);
  frmTax.tblTax.Locate('TaxID', tblTaxTaxID.value, []);
  frmTax.Show;
  screen.cursor := crDefault;
end;

procedure TfrmTaxes.mnuDeleteClick(Sender: TObject);
begin
  tblTax.delete;
  DbiSaveChanges(tblTax.handle);
end;

procedure TfrmTaxes.mnuExitClick(Sender: TObject);
begin
  Close;
end;

procedure TfrmTaxes.FormResize(Sender: TObject);
var
  Bookmark: TBookmark;
begin
  if (WindowState <> OldWindowState)   //Prevent grid resize bugs.
  and (WindowState <> wsMinimized)
  and (OldWindowState <> wsMinimized)
  then begin
    screen.cursor := crHourglass;
    Bookmark := tblTax.GetBookmark;
    tblTax.First;
    tblTax.refresh;
    try tblTax.GotoBookmark(Bookmark); except; end;
    tblTax.FreeBookmark(BookMark);
    screen.cursor := crDefault;
  end;
  OldWindowState := WindowState;
end;

procedure TfrmTaxes.mnuPrintClick(Sender: TObject);
begin
  screen.cursor := crHourglass;
  application.createform (TrptTaxes,rptTaxes);
  screen.cursor := crDefault;
  rptTaxes.QuickReport.Preview;
end;

procedure TfrmTaxes.mnuTaxesHelpClick(Sender: TObject);
begin
  Application.HelpContext(270);
end;

end.