unit1.pas

罗小平<<delphi精要>>一书源码

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Contnrs;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    ListBox1: TListBox;
    ListBox2: TListBox;
    ListBox3: TListBox;
    ListBox4: TListBox;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Button5: TButton;
    Button6: TButton;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
  private
    ObjectList: TObjectList;
    ComponentList: TComponentList;
    ObjectStack: TObjectStack;
    ObjectQueue: TObjectQueue;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  ObjectList := TObjectList.Create(False);
  ComponentList := TComponentList.Create(False);
  ObjectStack := TObjectStack.Create;
  ObjectQueue := TObjectQueue.Create;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  ObjectList.Free;
  ComponentList.Free;
  ObjectStack.Free;
  ObjectQueue.Free;
end;

procedure TForm1.Button5Click(Sender: TObject);
var
  C: Integer;
begin
  for C := 0 to ControlCount-1 do
  begin
    ObjectList.Add(Controls[C]);
    ComponentList.Add(Controls[C]);
    ObjectStack.Push(Controls[C]);
    ObjectQueue.Push(Controls[C]);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  C: Integer;
begin
  ListBox1.Items.Clear;
  for C := 0 to ObjectList.Count-1 do
    ListBox1.Items.Add(TControl(ObjectList.Items[C]).Name);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  C: Integer;
begin
  ListBox2.Items.Clear;
  for C := 0 to ComponentList.Count-1 do
    ListBox2.Items.Add(ComponentList.Items[C].Name);
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  C: Integer;
begin
  ListBox3.Items.Clear;
  for C := 0 to ObjectStack.Count-1 do
    ListBox3.Items.Add(TControl(ObjectStack.Pop).Name);
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  C: Integer;
begin
  ListBox4.Items.Clear;
  for C := 0 to ObjectQueue.Count-1 do
    ListBox4.Items.Add(TControl(ObjectQueue.Pop).Name);
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
  Button5.Free;
end;

end.