Extension of Duceland Designer

Duceland Designer can extent by DLLs. The DLL project may there are follow Export functoins :

DLLEXPORT
void WINAPI SetFunctions(GlobalEnvVariant *env);
It call InitEnvVariant() function in ShareData.cpp.To set structure GlobalEnvVariant.

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DLLEXPORT
bool WINAPI BuildinInitLib(TForm *owner);
To do initial global variants of this library.

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DLLEXPORT
void WINAPI BuildinReleaseLib();
To do release global variants of this library.

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DLLEXPORT
int WINAPI BuildinGetUmlElementCount();
Return the count of this library supported.

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DLLEXPORT
LElement * WINAPI BuildinGetUmlElement(int index);
Return global element supported int this library by index

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DLLEXPORT
LElement * WINAPI BuildinGetUmlElementByName(char *name);
Return global element supported int this library by ClassName.

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DLLEXPORT
bool WINAPI BuildinDestroyUmlElement(LElement *theObject);
Destroy the element if that supported int this library, and return true. Otherwise, return NULL.

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DLLEXPORT
LElement * WINAPI BuildinCreateUmlElement(int index,TForm *owner);
Create a element supported int this library by index, and return it.

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DLLEXPORT
LElement * WINAPI BuildinCreateUmlElementByName(char *name,TForm *owner,char *Address);
Create a element supported int this library by ClassName of element, and return it.

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Define Element

To define Element, inherit LElement class, and overide the virtual member functions of it. These are the important function :

void Paint(LCanvas *canvas);//override it, to change the element shape.

void Rebuild(); //override it, to recalculate member data when other relative element changes.

void ShowProperty(TForm *form);//When user double click the element, show a property dialog.

void PropertyOK(bool bClosed);//When user click OK button on property dialog. Here would be restore property values.