Сохранение в файле и загрузка из файла формы с компонентами

Советы » Файлы » Сохранение в файле и загрузка из файла формы с компонентами

unit

Cref_f; interface

uses

SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls, Menus; type

CRefType = class

of

TControl; TForm1 = class

(TForm) MainMenu1: TMainMenu; File1: TMenuItem; Exit1: TMenuItem; N1: TMenuItem; SaveAs1: TMenuItem; Open1: TMenuItem; New1: TMenuItem; Help1: TMenuItem; About1: TMenuItem; Panel1: TPanel; RadioRadioButton: TRadioButton; ButtonRadioButton: TRadioButton; EditRadioButton: TRadioButton; OpenDialog1: TOpenDialog; SaveDialog1: TSaveDialog; SaveAs2: TMenuItem; N2: TMenuItem; SaveDialog2: TSaveDialog; MemoRadioButton: TRadioButton; procedure

RadioButtonRadioClick(Sender: TObject); procedure

RadioButtonButtonClick(Sender: TObject); procedure

RadioButtonEditClick(Sender: TObject); procedure

FormCreate(Sender: TObject); procedure

FormMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); procedure

New1Click(Sender: TObject); procedure

Open1Click(Sender: TObject); procedure

SaveAs1Click(Sender: TObject); procedure

About1Click(Sender: TObject); procedure

Exit1Click(Sender: TObject); procedure

SaveAs2Click(Sender: TObject); procedure

MemoRadioButtonClick(Sender: TObject); private

ClassRef: CRefType; Counter: Integer; end

; var

Form1: TForm1; implementation

{$R *.DFM} procedure

TForm1.RadioButtonRadioClick(Sender: TObject); begin

ClassRef := TRadioButton; end

; procedure

TForm1.RadioButtonButtonClick(Sender: TObject); begin

ClassRef := TButton; end

; procedure

TForm1.RadioButtonEditClick(Sender: TObject); begin

ClassRef := TEdit; end

; procedure

TForm1.FormCreate(Sender: TObject); begin

ClassRef := TRadioButton; Counter := 0; end

; procedure

TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); var

MyObj: TControl; MyName: String

; begin

{create an object using the current class reference} MyObj := ClassRef.Create (self); MyObj.Visible := False; MyObj.Parent := self; MyObj.Left := X; MyObj.Top := Y; Inc (Counter); {define the name using the class name, without the initial T, and the number of the Counter} MyName := ClassRef.ClassName + IntToStr (Counter); Delete (MyName, 1, 1); MyObj.Name := MyName; MyObj.Visible := True; end

; procedure

TForm1.New1Click(Sender: TObject); var

I: Integer; begin

{delete all existing components, except the panel} for

I := ControlCount - 1 downto

0 do

if

Controls[I].ClassName <> 'TPanel' then

Controls[I].Free; Counter := 0; end

; procedure

TForm1.Open1Click(Sender: TObject); var

S: TFileStream; New: TComponent; Reader1: TReader; // new line begin

if

OpenDialog1.Execute then

begin

{remove existing controls} New1Click (self); {open the stream} S := TFileStream.Create (OpenDialog1.FileName, fmOpenRead); try

while

S.Position < S.Size do

begin

{read a component and add it to the form} // old code: // New := S.ReadComponent (nil); // InsertControl (New as TControl); // new code: Reader1 := TReader.Create (S, 4096); try

Reader1.Parent := self; New := Reader1.ReadRootComponent (nil

); InsertComponent (New); finally

Reader1.Free; end

; Inc (Counter); end

; finally

S.Free; end

; end

; end

; procedure

TForm1.SaveAs1Click(Sender: TObject); var

S: TFileStream; I: Integer; begin

if

SaveDialog1.Execute then

begin

{open or create the stream file} S := TFileStream.Create (SaveDialog1.FileName, fmOpenWrite or

fmCreate); try

{save each component except the panel} for

I := 0 to

ControlCount - 1 do

if

Controls[I].ClassName <> 'TPanel' then

S.WriteComponent (Controls[I]); finally

S.Free; end

; end

; end

; procedure

TForm1.About1Click(Sender: TObject); begin

MessageDlg ('CREF2 Example: Save components to file' + Chr(13) + 'From "Mastering Delphi", by Marco Cantщ', mtInformation, [mbOk], 0); end

; procedure

TForm1.Exit1Click(Sender: TObject); begin

Close; end

; {save form file} procedure

TForm1.SaveAs2Click(Sender: TObject); begin

if

SaveDialog2.Execute then

WriteComponentResFile (SaveDialog2.Filename, self); end

; procedure

TForm1.MemoRadioButtonClick(Sender: TObject); begin

ClassRef := TMemo; end

; initialization

{register the classes of the components; this code is required by the stream loader} RegisterClasses ([TRadioButton, TEdit, TButton, TMemo]); end

.

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