DndSource (Property)

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Drag-and-drop operations managed automatically or set programmatically
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DndSource (Property)

In french: DndSource

Some controls of WINDEV and WEBDEV can manage drag-and-drop operations automatically: simply check the corresponding option in the "Details" tab of the control description. A control can be defined as source or target of a drag-and-drop operation.

Drag-and-drop operations are automatically available:

for Edit, List Box, ListView and TreeView controls.
for Upload, Static, Button, Link, Image, formatted text, List Box and Combo Box controls.

In a drag-and-drop operation set programmatically, the DndSource and DndTarget properties are used to define the Drag and Drop source and target controls.

The DndSource property is used to determine and change a control's drag and drop behavior (List, ListView, Looper, TreeView, etc.). This control will be defined as source for Drag and Drop, which means that Drag and Drop will be performed from this control.

Example

// -- Initialization of LIST_Source
// LIST_Source is not a target
LIST_Source.DndSource = dndInactive

// -- Initialization of LIST_Target
LIST_Target.DndTarget = dndProgram
DnDEvent("Drop", "LIST_Target", dndDrop)
DnDEvent("DragOver", "LIST_Target", dndDragOver)

Syntax

Finding out the behavior of a source control for Drag and Drop Hide the details

<Drag and Drop> = <Control used>.DndSource

<Drag and Drop>: Constant

Identifies the behavior of the source control for Drag and Drop:
dndAuto The drag-and-drop operation is managed automatically
dndInactive Drag and Drop is disabled for this control
dndProgram The developer sets the drag-and-drop operation programmatically

<Control used>: Control name

Name of the control to be used.

Modifying the behavior of a source control for Drag and Drop Hide the details

<Control used>.DndSource = <Drag and Drop>

<Control used>: Control name

Name of the control to be used.

<Drag and Drop>: Constant

Identifies the behavior of the source control for Drag and Drop.
dndAuto The drag-and-drop operation is managed automatically
dndInactive Drag and Drop is disabled for this control
dndProgram The developer sets the drag-and-drop operation programmatically

Remarks

Drag-and-drop operations managed automatically or set programmatically

Automatic drag-and-drop operations are available for Edit, List Box, ListView, TreeView and Table controls.

Drag-and-drop operations can be set programmatically for the following controls:

Edit control
List Box and ListView control
TreeView control
Table control
Image control
Bar Code control
Button control
Looper control
Chart control
TreeView Table control
Calendar control
Organizer control
Scheduler control

Only automatic drag-and-drop operations are available.

Automatic drag-and-drop operations are available for the following controls:

Upload control,
Static control,
Button control,
Link control,
Image control,
Formatted display control,
Edit control,
List Box control,
Combo Box control.

You can also programmatically set drag-and-drop operations on cells, supercontrols and control templates.

Limit

The DndSource property can only be used with the following controls:

Edit control,
List Box control,
ListView control,
TreeView control,
Looper control,
Image control,
Chart control,
Table control,
TreeView Table control,
Calendar control,
Organizer control,
Scheduler control,
Button control,
Rating control.

The DndSource property applies only to Edit, List Box and TreeView controls.

The DndSource property can only be used with the following controls:

Edit control,
Button control,
Static control,
Link control,
Image control,
Formatted display control,
List Box control,
Combo Box control,
Cell control,
Supercontrol,
Control template.
Rich Text Area control.