---
name: "XmDropSiteRegister"
section: "3"
platform: "linux"
package: "openmotif"
version: "2.3.8-4"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/XmDropSiteRegister"
---

# XmDropSiteRegister(3)

A Drag and Drop function that identifies a drop site and assigns resources that specify its behavior

## NAME

**XmDropSiteRegister** — A Drag and Drop function that identifies a drop site and assigns resources that specify its behavior

## SYNOPSIS

```
#include <Xm/DragDrop.h>
void XmDropSiteRegister(
Widget widget,
ArgList arglist,
Cardinal argcount);
```

## DESCRIPTION

**XmDropSiteRegister** identifies the specified widget or gadget as a drop site and sets resource values that define the drop site's behavior. The routine assigns default values to any resources that are not specified in the argument list. The toolkit generates a warning message if a drop site is registered with **XmNdropSiteActivity** set to **XmDROP\_SITE\_ACTIVE** and the **XmNdropProc** resource is NULL.

If the drop site is a descendant of a widget that is registered as a drop site, the **XmNdropSiteType** resource of the ancestor drop site must be specified as **XmDROP\_SITE\_COMPOSITE**. The ancestor must be registered before the descendant. The drop site is stacked above all other sibling drop sites already registered.

- *widget*

  Specifies the ID of the widget to be registered.

- *arglist*

  Specifies the argument list.

- *argcount*

  Specifies the number of attribute/value pairs in the argument list (*arglist*).

For a complete definition of DropSite and its associated resources, see [**XmDropSite**(3)](/XmDropSite/3.md).

## RELATED

[**XmDisplay**(3)](/XmDisplay/3.md), [**XmDropSite**(3)](/XmDropSite/3.md), [**XmDropSiteEndUpdate**(3)](/XmDropSiteEndUpdate/3.md), [**XmDropSiteStartUpdate**(3)](/XmDropSiteStartUpdate/3.md), [**XmDropSiteUpdate**(3)](/XmDropSiteUpdate/3.md), [**XmDropSiteUnregister**(3)](/XmDropSiteUnregister/3.md), and [**XmScreen**(3)](/XmScreen/3.md).