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{
Simple components for testing the RTTI capabilities of codetools
}
unit Dsgn_BearControls;
{$mode ObjFPC}{$H+}
interface
uses
Classes, SysUtils;
type
{ TBearComponent }
TBearComponent = class(TComponent)
end;
TBearCaption = type string;
{ TBearControl }
TBearControl = class(TBearComponent)
private
FCaption: TBearCaption;
FControls: TFPList; // list of TBearControl
FHeight: integer;
FLeft: integer;
FParent: TBearControl;
FTop: integer;
FVisible: boolean;
FWidth: integer;
function GetControlCount: integer;
function GetControls(Index: integer): TBearControl;
procedure SetParent(const AValue: TBearControl);
procedure SetVisible(const AValue: boolean);
protected
procedure GetChildren(Proc: TGetChildProc; Root: TComponent); override;
procedure Notification(AComponent: TComponent; Operation: TOperation);
override;
procedure SetParentComponent(Value: TComponent); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function GetParentComponent: TComponent; override;
function IsParentOf(AControl: TBearControl): boolean;
function HasParent: Boolean; override;
property Caption: TBearCaption read FCaption write FCaption;
property ControlCount: integer read GetControlCount;
property Controls[Index: integer]: TBearControl read GetControls;
property Height: integer read FHeight write FHeight;
property Left: integer read FLeft write FLeft;
property Parent: TBearControl read FParent write SetParent;
property Top: integer read FTop write FTop;
property Visible: boolean read FVisible write SetVisible;
property Width: integer read FWidth write FWidth;
end;
{ TBearCustomForm }
TBearCustomForm = class(TBearControl)
end;
{ TBearForm }
TBearForm = class(TBearCustomForm)
published
property Caption;
property Height;
property Left;
property Top;
property Visible;
property Width;
end;
{ TBearCustomLabel }
TBearCustomLabel = class(TBearControl)
end;
{ TBearLabel }
TBearLabel = class(TBearCustomLabel)
published
property Caption;
property Height;
property Left;
property Top;
property Visible;
property Width;
end;
{ TBearCustomPanel }
TBearCustomPanel = class(TBearControl)
private
FBevelWidth: word;
public
property BevelWidth: word read FBevelWidth write FBevelWidth;
end;
{ TBearPanel }
TBearPanel = class(TBearCustomPanel)
published
property BevelWidth;
property Height;
property Left;
property Top;
property Visible;
property Width;
end;
implementation
{ TBearControl }
function TBearControl.GetControlCount: integer;
begin
Result:=FControls.Count;
end;
function TBearControl.GetControls(Index: integer): TBearControl;
begin
Result:=TBearControl(FControls[Index]);
end;
procedure TBearControl.SetParent(const AValue: TBearControl);
begin
if FParent=AValue then Exit;
if AValue=Self then
raise Exception.Create('TBearControl.SetParent Self');
if (AValue<>nil) and IsParentOf(AValue) then
raise Exception.Create('TBearControl.SetParent cycle');
if FParent<>nil then
FParent.FControls.Remove(Self);
FParent:=AValue;
if FParent<>nil then begin
FParent.FControls.Add(Self);
FreeNotification(FParent);
end;
end;
procedure TBearControl.SetVisible(const AValue: boolean);
begin
if FVisible=AValue then Exit;
FVisible:=AValue;
end;
procedure TBearControl.GetChildren(Proc: TGetChildProc; Root: TComponent);
var
I: Integer;
Control: TBearControl;
begin
for I := 0 to ControlCount-1 do
begin
Control := Controls[i];
if Control.Owner = Root then Proc(Control);
end;
end;
procedure TBearControl.SetParentComponent(Value: TComponent);
begin
if Value is TBearControl then
Parent:=TBearControl(Value);
end;
procedure TBearControl.Notification(AComponent: TComponent;
Operation: TOperation);
begin
inherited Notification(AComponent, Operation);
if Operation=opRemove then
begin
if AComponent=FParent then
FParent:=nil
else
FControls.Remove(AComponent);
end;
end;
constructor TBearControl.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FControls:=TFPList.Create;
end;
destructor TBearControl.Destroy;
begin
Parent:=nil;
FreeAndNil(FControls);
inherited Destroy;
end;
function TBearControl.GetParentComponent: TComponent;
begin
Result:=Parent;
end;
function TBearControl.IsParentOf(AControl: TBearControl): boolean;
begin
Result := False;
while Assigned(AControl) do
begin
AControl := AControl.Parent;
if Self = AControl then
Exit(True);
end;
end;
function TBearControl.HasParent: Boolean;
begin
Result:=Parent<>nil;
end;
end.
|
