Title: Writing TPanelForm
Question: Making TPanel designable likewise TForm & TDataModule...
Answer:
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unit PanelForm;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ExtCtrls, ComCtrls;
type
TPanelForm = class(TPanel)
private
FOnCreate: TNotifyEvent;
FOnDestroy: TNotifyEvent;
protected
procedure GetChildren(Proc: TGetChildProc; Root: TComponent); override;
public
constructor Create(AOwner: TComponent); override;
constructor CreateNew(AOwner: TComponent);
destructor Destroy; override;
published
property OnCreate: TNotifyEvent read FOnCreate write FOnCreate;
property OnDestroy: TNotifyEvent read FOnDestroy write FOnDestroy;
end;
implementation
uses
Consts;
procedure TPanelForm.GetChildren(Proc: TGetChildProc; Root: TComponent);
var
I: Integer;
OwnedComponent: TComponent;
begin
inherited GetChildren(Proc, Root);
if Root = Self then
for I := 0 to ComponentCount - 1 do
begin
OwnedComponent := Components[I];
if not OwnedComponent.HasParent then Proc(OwnedComponent);
end;
end;
constructor TPanelForm.Create(AOwner: TComponent);
begin
CreateNew(AOwner);
if (ClassType TPanelForm) {and not (csDesigning in ComponentState)} then
if not InitInheritedComponent(Self, TPanelForm) then
raise EResNotFound.CreateFmt(SResNotFound, [ClassName]);
try
if Assigned(FOnCreate) then FOnCreate(Self);
except
Application.HandleException(Self);
end;
end;
constructor TPanelForm.CreateNew(AOwner: TComponent);
begin
inherited Create(AOwner);
end;
destructor TPanelForm.Destroy;
begin
if Assigned(FOnDestroy)
then FOnDestroy(Self);
inherited;
end;
end.
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unit xFormsReg;
interface
procedure Register;
implementation
uses
DsgnIntf, Classes, PanelForm;
procedure Register;
begin
RegisterCustomModule(TPanelForm, nil);
RegisterClass(TPanelForm);
end;
end.
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package xForms;
requires
vcl40;
contains
PanelForm,
xFormsReg;
end.
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There is no standard way to create such panel forms. Just create new form, change its ancestor from TForm to TPanelForm and press Alt+F12 two times.
Good luck !