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{
Here we define some commands that can be reused throughout a application.
Command actions are kept separate from the UI code (Forms).
}
unit commands;
{$mode objfpc}{$H+}
interface
uses
gfx_command_intf,
gui_memo;
type
// non reference counted interface
TNullInterfacedObject = class(TObject)
protected
function QueryInterface(const IID: TGUID; out Obj): longint; stdcall;
function _AddRef: longint; stdcall;
function _Release: longint; stdcall;
end;
TAddCommand = class(TInterfacedObject, ICommand)
private
FMemo: TfpgMemo;
public
constructor Create(AMemo: TfpgMemo); reintroduce;
procedure Execute;
end;
TExitCommand = class(TInterfacedObject, ICommand)
public
procedure Execute;
end;
implementation
uses
fpgfx, SysUtils;
{ TNullInterfacedObject }
function TNullInterfacedObject.QueryInterface(const IID: TGUID; out Obj): longint; stdcall;
begin
if GetInterface(IID, Obj) then
Result := 0
else
result := integer(e_nointerface);
end;
function TNullInterfacedObject._AddRef: longint; stdcall;
begin
Result := -1;
end;
function TNullInterfacedObject._Release: longint; stdcall;
begin
Result := -1;
end;
{ TAddCommand }
constructor TAddCommand.Create(AMemo: TfpgMemo);
begin
inherited Create;
FMemo := AMemo;
end;
procedure TAddCommand.Execute;
begin
Writeln('>> TAddComand.Execute');
FMemo.Lines.Add('Hello ' + IntToStr(Random(500)));
FMemo.Invalidate;
end;
{ TExitCommand }
procedure TExitCommand.Execute;
begin
Writeln('>> TExitComand.Execute');
fpgApplication.Terminated := True;
end;
end.
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