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**DROPID(** //signature// [, //signature//] **)**

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| **DROPID** | Specifies a control that can serve as a drag-and-drop target. |
| //signature// | A string constant containing an identifier used to indicate valid drag hosts. A single DROPID may contain up to 16 //signatures//. Any //signature// that begins with a tilde (~) indicates that the information can also be dropped from an external (Clarion) program.The RTL has support for two predefined signatures to accept drag-and-drop data from\\ external programs:**'~TEXT'** can be used to accept text dropped from an external program such as MS Word.\\ **'~FILE'**  can be used to accept a comma-delimited list of filenames dragged from the Windows File Explorer.** The **~TEXT** signature is supported on XP/Vista/Win7/Win8.Your program must either have no manifest, or have a manifest with the privilege level set to "asInvoker" to allow dragging from Explorer in Windows 8. |

The **DROPID** attribute (PROP:DROPID, an array) specifies a control that can serve as a drag-and-drop target. DROPID works in conjunction with the DRAGID attribute. The DROPID //signature// strings (up to 16) define validation keys to match against the //signature// parameters of the host control's DRAGID. This provides control over where successful drag-and-drop operations are allowed.

A drag-and-drop operation occurs when the user drags information from a control with the DRAGID attribute to a control with the DROPID attribute. For a successful drag-and-drop operation, both controls must have at least one identical //signature// string in their respective DRAGID and DROPID attributes.

**Example:**

**WinOne WINDOW,AT(0,0,160,400)**

**        !Allows drags, but not drops:**

**        LIST,AT(120,0,20,20),USE(?List1),FROM(Que1),DRAGID('FromList1')**

**        !Allows drops from List1 or the Windows File Manager, but no drags:**

**        LIST,AT(120,120,20,20),USE(?List2),FROM(Que2),DROPID('FromList1','~FILE')**

**       END**

** CODE**

** OPEN(WinOne)**

** !Drag and Drop Ids can also be assigned at runtime**

** ?List2{PROP:DropID,1) = 'FromList1'**

** ?List1{PROP:DragID,1) = 'FromList1'**

** !*************************************************

** ACCEPT**

**  CASE EVENT()**

**  OF EVENT:Drag        !When a drag event is attempted**

**   IF DRAGID()         !check for success**

**    SETDROPID(Que1)    !and setup info to pass**

**   END**

**  OF EVENT:Drop        !When drop event is successful**

**   Que2 = DROPID()     !get dropped info**

**   ADD(Que2)           !and add it to the queue**

**  END**

** END**

**See Also:**

[[dragid  set drag and drop host signatures .htm|DRAGID]]