fdragndrop.class

Gambas is a graphical development environment based on a Basic interpreter, like Visual Basic. It us

' Gambas class file

PRIVATE $iKey AS Integer
PRIVATE CONST MIME_TYPE AS String = "text/x-gambas-dragndrop-example"

PUBLIC SUB imgIcon_MouseMove()

  IF Mouse.Left THEN
    Drag.Icon = LAST.Picture
    LAST.Drag(LAST.Picture.Image)
  ENDIF

END

' PUBLIC SUB TreeView1_Drag()
'
'   IF Drag.Type <> Drag.Image THEN STOP EVENT
'
' END

PUBLIC SUB TreeView1_DragMove()

  IF Drag.Type <> Drag.Image THEN STOP EVENT

END

PUBLIC SUB TreeView1_Drop()

  DIM sKey AS String

  WITH TreeView1

    IF NOT .Find(Drag.X, Drag.Y) THEN
      sKey = .Item.Key
    ENDIF

    INC $iKey
    .Add($iKey, "#" & $iKey, Drag.Data.Picture, sKey).EnsureVisible

  END WITH

END

PUBLIC SUB TreeView1_MouseMove()

  DIM hPict AS Picture

  IF NOT Mouse.Left THEN RETURN

  WITH TreeView1
    IF .Find(Mouse.X, Mouse.Y) THEN RETURN
    IF NOT .Key THEN RETURN

    hPict = NEW Picture(32 + 8 + .Font.Width(.Current.Text), 32, TRUE)
    Draw.Begin(hPict)
      Draw.Picture(.Current.Picture, 0, 0)
      Draw.Font = .Font
      Draw.Text(.Current.Text, 34, 0, hPict.Width, 32, Align.Left)
    Draw.End

    Drag.Icon = hPict
    .Drag(.Key, MIME_TYPE)
  END WITH

END

PUBLIC SUB imgHole_Drag()

  IF Drag.Type = Drag.Text THEN
    IF Drag.Format = MIME_TYPE THEN
      RETURN
    ENDIF
  ENDIF

  STOP EVENT

END

PUBLIC SUB imgHole_Drop()

  TreeView1.Remove(Drag.Data)

END

PUBLIC SUB Form_Open()

  ME.Center

END