# Interface ICefDragHandler

Description
Hierarchy
Methods

## Unit

uCEFInterfaces

## Declaration

`type ICefDragHandler = interface(ICefBaseRefCounted)`

## Description

Implement this interface to handle events related to dragging. The functions of this interface will be called on the UI thread.

UNKNOWN

<see href="https://bitbucket.org/chromiumembedded/cef/src/master/include/capi/cef_drag_handler_capi.h">CEF source file: /include/capi/cef_drag_handler_capi.h (cef_drag_handler_t))

## Hierarchy

- IInterface
- ICefBaseRefCounted
- ICefDragHandler

## Overview

### Methods

Public | `function OnDragEnter(const browser: ICefBrowser; const dragData: ICefDragData; mask: TCefDragOperations): Boolean;`
Public | `procedure OnDraggableRegionsChanged(const browser: ICefBrowser; const frame: ICefFrame; regionsCount: NativeUInt; const regions: PCefDraggableRegionArray);`
Public | `procedure RemoveReferences;`

## Description

### Methods

Public | `function OnDragEnter(const browser: ICefBrowser; const dragData: ICefDragData; mask: TCefDragOperations): Boolean;`
Called when an external drag event enters the browser window. |dragData| contains the drag event data and |mask| represents the type of drag operation. Return false (0) for default drag handling behavior or true (1) to cancel the drag event. ###### Attributes GUID['{59A89579-5B18-489F-A25C-5CC25FF831FC}']

Public | `procedure OnDraggableRegionsChanged(const browser: ICefBrowser; const frame: ICefFrame; regionsCount: NativeUInt; const regions: PCefDraggableRegionArray);`
Called whenever draggable regions for the browser window change. These can be specified using the '-webkit-app-region: drag/no-drag' CSS-property. If draggable regions are never defined in a document this function will also never be called. If the last draggable region is removed from a document this function will be called with an NULL vector.

Public | `procedure RemoveReferences;`
Custom procedure to clear all references.

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