The application developer must ensure that the actions are executed - that the data is actually moved or copied. When the user drops the object, the onDrop event of the target is triggered. A view element or its entries can be dropped onto a target object, if a DropTargetInfo is defined for the target object (see below), and at least one target and source tags match. Otherwise the mouse pointer displays a prohibitive sign. If the user moves the mouse pointer over a UI element on which the user can drop the object, this is displayed either as a box with a dotted line border (for example, MatrixLayout), as a row inserted between other rows (for example, Table), or it is is highlighted (for example, table rows). While the user holds down the mouse button, a "ghost" image appears on the screen (a copy of the dragged objects), which follows the movement of the mouse cursor. Public partial class Form1 : user drags a UI element, for example, an Image, a row from a Table, a node of a Tree, or entries in an ItemListBox by holding down the mouse button. Specifies the name of the DragDropEvents component that you can use to subscribe to drag events (see below). You can override this setting in a DragEnter event handler. If this setting is set to false, the DragOver and consequent events do not raise. Set this property to false if you want the control to only be a source of drag operations. Specifies whether users are allowed to drop data items on the control. Set this property to false if you want the control to only be a target of drag operations. Specifies whether users are allowed to drag data items from the control. You can customize the indicator in a DragOver event handler. Specifies whether to show where data items will be inserted. Specifies whether a preview of dragged element(s) is displayed during the operation. Specifies the control/view to which the Behavior is attached. In the Behavior editor’s Properties section, you can specify the following options. It is assumed that you use the standard drag-and-drop engine in this case.ĭo not confuse the Control.AllowDrop property with the Behavior’s AllowDrop property. The attached Drag-and-Drop Behavior is disabled if the Control.AllowDrop property is set to true. The Target property is set to a control on the form that supports Behavior.
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