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PythonAction.pas
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180 lines (159 loc) · 4.46 KB
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unit PythonAction;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ActnList, PythonEngine;
type
TPythonAction = class(TAction)
private
fRegisteredMethods: TList;
fPythonModule: TPythonModule;
fClearname: string;
fRegistername: string;
fUnregistername: string;
procedure ClearMethods;
protected
function PythonClear(pself, args: PPyObject): PPyObject; cdecl;
function PythonRegister(pself, args: PPyObject): PPyObject; cdecl;
function PythonUnregister(pself, args: PPyObject): PPyObject; cdecl;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function HandlesTarget(Target: TObject): Boolean; override;
function Execute: Boolean; override;
procedure UpdateTarget(Target: TObject); override;
procedure InitializeAction;
property RegisteredMethods: TList read fRegisteredMethods;
published
property PythonModule: TPythonModule read fPythonModule write fPythonModule;
end;
procedure Register;
implementation
procedure Register;
begin
RegisterActions('Python', [TPythonAction], TComponent);
end;
{ TPythonAction }
procedure TPythonAction.ClearMethods;
var
i: integer;
begin
if PythonOK then
with GetPythonEngine, RegisteredMethods do
begin
for i:=0 to Count-1 do
Py_XDECREF(PPyObject(Items[i]));
Clear;
end;
end;
constructor TPythonAction.Create(AOwner: TComponent);
begin
inherited;
fRegisteredMethods := TList.Create;
end;
destructor TPythonAction.Destroy;
begin
ClearMethods;
fRegisteredMethods.Free;
inherited;
end;
function TPythonAction.Execute: Boolean;
var
i: integer;
func: PPyObject;
begin
Result := inherited Execute;
with GetPythonEngine, RegisteredMethods do
begin
i:=0;
while i < Count do
begin
func := Items[i];
// The function could be deleted by reimport of the Python module
// or other reasons!
try
EvalFunctionNoArgs(func);
Inc(i);
except
Py_XDECREF(func);
Delete(i);
end;
end;
end;
end;
function TPythonAction.HandlesTarget(Target: TObject): Boolean;
begin
Result := True;
end;
procedure TPythonAction.InitializeAction;
var
docString: string;
begin
if not (csDesigning in ComponentState) and Assigned(PythonModule) then
begin
fClearname := 'Clear' + Name;
docString := 'Claer all events of "' + Owner.Name + '.' + Name + '" action';
PythonModule.AddDelphiMethod(PChar(fClearname), PythonClear, PChar(docString));
fRegistername := 'Register' + Name;
docString := 'Register an event againt the "' + Owner.Name + '.' + Name + '" action';
PythonModule.AddDelphiMethod(PChar(fRegistername), PythonRegister, PChar(docString));
fUnregistername := 'Unregister' + Name;
docString := 'Unregister an event againt the "' + Owner.Name + '.' + Name + '" action';
PythonModule.AddDelphiMethod(PChar(fUnregistername), PythonUnregister, PChar(docString));
end;
end;
function TPythonAction.PythonClear(pself, args: PPyObject): PPyObject;
begin
ClearMethods;
with GetPythonEngine, RegisteredMethods do
begin
Result := PyInt_FromLong(Count);
end;
end;
function TPythonAction.PythonRegister(pself, args: PPyObject): PPyObject;
var
func: PPyObject;
s: string;
begin
Result := nil;
with GetPythonEngine do
if (PyArg_ParseTuple( args, 'O',@func) = 0) or
( not PyFunction_Check(func)) then
begin
s := fRegistername + '(function)';
PyErr_SetString(PyExc_TypeError^,PChar(s));
end
else
with RegisteredMethods do
begin
Py_XINCREF(func);
Add(func);
Result := PyInt_FromLong(Count);
end;
end;
function TPythonAction.PythonUnregister(pself, args: PPyObject): PPyObject;
var
func: PPyObject;
s: string;
begin
Result := nil;
with GetPythonEngine do
if (PyArg_ParseTuple( args, 'O',@func) = 0) or
(RegisteredMethods.IndexOf(func) = -1) then
begin
s := fUnregistername + '(function)';
PyErr_SetString(PyExc_TypeError^,PChar(s));
end
else
with RegisteredMethods do
begin
Py_XDECREF(func);
Remove(func);
Result := PyInt_FromLong(Count);
end;
end;
procedure TPythonAction.UpdateTarget(Target: TObject);
begin
Enabled := (RegisteredMethods.Count > 0) or Assigned(OnExecute);
end;
end.