LINK
LINK [id]
{
[Common flags]
[ACCEPT idlist;]
[REFUSE idlist;]
}
Represents
BaseLink
objects in a container. Rendered as a link box (
LinkBoxGui
) to which the user can drag objects.
Provides a smart link to node objects. Specify what kinds of nodes are accepted and/or refused for this field with
ACCEPT
and/or
REFUSE
.
Further specify what objects are accepted by listening for MSG_DESCRIPTION_CHECKDRAGANDDROP in NodeData::Message() and returning true of false depending on the DescriptionCheckDragAndDrop data:
SplineRailObject::Message( GeListNode *node, Int32 type, void *data) { ... if (type== MSG_DESCRIPTION_CHECKDRAGANDDROP ) { DescriptionCheckDragAndDrop *dcu = static_cast< DescriptionCheckDragAndDrop * > (data); switch (dcu->id[0].id) { case SPLINERAILOBJECT_SPLINE1 : case SPLINERAILOBJECT_SPLINE2 : case SPLINERAILOBJECT_SPLINE3 : case SPLINERAILOBJECT_SPLINE4 : dcu->result = dcu->element->GetInfo() & OBJECT_SPLINE; return true ; } } }In a dialog listen for MSG_DESCRIPTION_CHECKDRAGANDDROP instead in GeDialog::Message() with the following message container IDs:
| Container ID | 类型 | 描述 |
|---|---|---|
| LINKBOX_ACCEPT_MESSAGE_TYPE | Int32 | The type of the item dragged in the link box. |
| LINKBOX_ACCEPT_MESSAGE_ELEMENT | void* | A pointer ( BaseList2D* ) to the dragged object. |
| LINKBOX_ACCEPT_MESSAGE_ACCEPT | void* | A pointer to a boolean value. Set this value to true to accept the object. |
| LINKBOX_ACCEPT_MESSAGE_CONTROL_ID | Int32 | The ID of the control that sent the message. |
| ACCEPT idlist; | The node types to accept, separated with semi-colons. |
| REFUSE idlist; | The node types to refuse, separated with semi-colons. |