Applications can initiate custom drag-and-drop operations

Objo desktop applications can receive drag-and-drop content through the existing Control.DragEnter, DragOver, DragExit, and Drop events, but application code cannot currently start a drag operation of its own.

Add a source-side DragItem class so a control can package text and application-defined string data during a mouse drag and begin a native cross-platform drag-and-drop operation. Existing target controls should receive the content through DragData.

A typical workflow should be concise:

Sub Card_MouseDrag(x As Double, y As Double)
    Var item As New DragItem(Me)
    item.Text = "Card 42"
    item.SetData("dev.objo.card-id", "42")
    item.Drag()
End Sub

The receiving control can accept the drop through the existing events and inspect either the standard text or the named application data.