DndSource (Property)

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

In french: DndSource

For certain field types, WINDEV and WEBDEV offer a manage drag-and-drop operations automatically: simply check the corresponding option in the "Detail" tab of the field description. A control can be defined as source or target of a drag-and-drop operation.

Automatic Drag and Drop is available:

for Edit, List Box, ListView and TreeView controls.
The automatic Drag and Drop mode is also available for tokens in a "Text token" Edit control.
for Upload, Static, Button, Link, Image, formatted text, List Box and Combo Box controls.

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

The DndSource property determines how a control behaves in a drag-and-drop operation (Edit control, List Box, ListView, Looper, TreeView, etc.). This control will be set as the source object of the drag-and-drop operation.

Example

// -- Initialisation du champ LISTE_Source
// LISTE_Source n'est pas cible
LISTE_Source.DndSource = dndInactive

// -- Initialisation du champ LISTE_Cible
LISTE_Cible.DndCible = dndProgram
DnDEvent("Lâcher", "LISTE_Cible", dndDrop)
DnDEvent("Survol", "LISTE_Cible", 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 Drag-and-drop operations are handled 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 Drag-and-drop operations are handled 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.
The automatic Drag and Drop mode is also available for tokens in a "Text token" Edit control.

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.

An automation "Drag and Drop" is available for the following fields:

Upload control,
Static Text 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.

Limitation

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