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ClipbrdController.pas
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ClipbrdController.pas
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unit ClipbrdController;
interface
uses
DemoInterfaces;
type
TClipboardController = class(TInterfacedObject, IClipboardController)
private
FProvider : IClipboardProvider;
protected
procedure SetProvider(const value: IClipboardProvider);
procedure UnsetProvider(const value : IClipboardProvider);
function CanCopy: Boolean;
function CanCut: Boolean;
function CanPaste: Boolean;
procedure Copy;
procedure Cut;
procedure Paste;
public
constructor Create;
destructor Destroy;override;
end;
function ClipboardController : IClipboardController;
implementation
{ TClipboardController }
function TClipboardController.CanCopy: Boolean;
begin
result := (FProvider <> nil) and FProvider.CanCopy;
end;
function TClipboardController.CanCut: Boolean;
begin
result := (FProvider <> nil) and FProvider.CanCut;
end;
function TClipboardController.CanPaste: Boolean;
begin
result := (FProvider <> nil) and FProvider.CanPaste;
end;
procedure TClipboardController.Copy;
begin
if FProvider <> nil then
FProvider.Copy;
end;
constructor TClipboardController.Create;
begin
FProvider := nil; //just for debugging, not strictly needed;
end;
procedure TClipboardController.Cut;
begin
if FProvider <> nil then
FProvider.Cut;
end;
destructor TClipboardController.Destroy;
begin
FProvider := nil; //just for debugging, not strictly needed;
inherited;
end;
procedure TClipboardController.Paste;
begin
if FProvider <> nil then
FProvider.Paste;
end;
procedure TClipboardController.SetProvider(const value: IClipboardProvider);
begin
FProvider := value;
end;
procedure TClipboardController.UnsetProvider(const value: IClipboardProvider);
begin
if FProvider = value then
FProvider := nil;
end;
var
_ClipboardController : IClipboardController;
function ClipboardController : IClipboardController;
begin
result := _ClipboardController;
end;
initialization
_ClipboardController := TClipboardController.Create;
finalization
_ClipboardController := nil;
end.