page_unit.pas

一系列DELPHI的控件如何使用的例子,例子有的比较简单,但是能详细的说明了控件的使用,对许多刚涉足DELPHI的朋友会很有帮助的

unit page_Unit;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, DBGrids, DB, DBTables, ComCtrls, ImgList, ExtCtrls;

type
  TForm1 = class(TForm)
    PageControl1: TPageControl;
    Panel1: TPanel;
    ImageList1: TImageList;
    TabSheet1: TTabSheet;
    TabSheet2: TTabSheet;
    TabSheet3: TTabSheet;
    TabSheet4: TTabSheet;
    Query1: TQuery;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    DBGrid2: TDBGrid;
    DBGrid3: TDBGrid;
    DBGrid4: TDBGrid;
    Table1: TTable;
    procedure FormCreate(Sender: TObject);
    procedure PageControl1Change(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
    PageControl1.TabIndex:=0;
    DBGrid1.DataSource:=DataSource1;
    with query1 do
      begin
      close;
      sql.Clear;
      sql.Add('select * from animals.dbf');
      open;
      end;
end;

procedure TForm1.PageControl1Change(Sender: TObject);
begin
    if PageControl1.TabIndex=0 then
    begin
    DBGrid1.DataSource:=DataSource1;
    with query1 do
      begin
      close;
      sql.Clear;
      sql.Add('select * from animals.dbf');
      open;
      end;
    end;
    if PageControl1.TabIndex=1 then
    begin
    DBGrid2.DataSource:=DataSource1;
    with query1 do
      begin
      close;
      sql.Clear;
      sql.Add('select * from biolife.db');
      open;
      end;
    end;
    if PageControl1.TabIndex=2 then
    begin
    DBGrid3.DataSource:=DataSource1;
    with query1 do
      begin
      close;
      sql.Clear;
      sql.Add('select * from customer.db');
      open;
      end;
    end;
    if PageControl1.TabIndex=3 then
    begin
    DBGrid4.DataSource:=DataSource1;
    with query1 do
      begin
      close;
      sql.Clear;
      sql.Add('select * from orders');
      open;
      end;
    end;
end;

end.