6 de abril de 2010

Menú desplegable en un CommandButton

Esta es una clase simple para mostrar un menú desplegable bajo un CommandButton. El menú se muestra al hacer click sobre el botón, o pulsando la barra espaciadora, F4 o ALT+DOWN sobre el mismo.

Espero les sea de utilidad
* Menú en commandbutton
WITH NEWOBJECT("xForm")
  .SHOW(1)
ENDWITH
RETURN

DEFINE CLASS xForm AS FORM
  ADD OBJECT cmdMenu1 AS xCommandButton WITH ;
    CAPTION = "Menu 1", TOP = 10, LEFT = 10,;
    MenuOptions = "Opcion 1 . \<1,Opcion 1 . \<2,Opcion 1 . \<3"

  ADD OBJECT cmdMenu2 AS xCommandButton WITH ;
    CAPTION = "Menu 2", TOP = 10, LEFT = 120,;
    MenuOptions = "Opcion 2 . \<1,Opcion 2 . \<2"

  ADD OBJECT cmdClose AS xCommandButton WITH ;
    CANCEL = .T., CAPTION = "Cerrar", TOP = 10, LEFT = 240

  PROCEDURE cmdClose.CLICK
    THISFORM.HIDE()
  ENDPROC
ENDDEFINE

DEFINE CLASS xCommandButton AS COMMANDBUTTON
  HEIGHT = 25

  MenuOptions = ""

  PROCEDURE MOUSEMOVE (nButton, nShift, nXCoord, nYCoord)
    IF nButton==1 AND ! EMPTY(THIS.MenuOptions)
      THIS.ShowPopupMenu()
      NODEFAULT
    ENDIF
  ENDPROC

  PROCEDURE KEYPRESS(nKeyCode, nShiftCtrlAlt)
    #DEFINE K_DOWN 160
    #DEFINE K_ALT 4
    #DEFINE K_F4 -3

    * WAIT WINDOW TRANSFORM(nKeyCode) + " " + TRANSFORM(nShiftCtrlAlt) NOWAIT

    DO CASE
      CASE nKeyCode==K_DOWN AND nShiftCtrlAlt==K_ALT
        NODEFAULT
        THIS.ShowPopupMenu()
      CASE nKeyCode==K_F4
        NODEFAULT
        THIS.ShowPopupMenu()
    ENDCASE
  ENDPROC

  PROCEDURE CLICK
    NODEFAULT
    THIS.ShowPopupMenu()
  ENDPROC

  * Armo y muestro el menú
  PROCEDURE ShowPopupMenu()
    LOCAL nOp, sOp, nY, nX, nRatio

    TRY
      RELEASE POPUP _Popup_Menu
    CATCH
    ENDTRY

    WITH THIS
      THISFORM.ADDPROPERTY("ActivePopupMenu", THIS)

      * Convierto de pixels a foxels
      nRatio = FONTMETRIC(1)
      nY = (.TOP + .HEIGHT) / nRatio

      nRatio = FONTMETRIC(6)
      nX = .LEFT / nRatio

      DEFINE POPUP _Popup_Menu FROM nY, nX SHORTCUT

      FOR nOp = 1 TO GETWORDCOUNT(.MenuOptions, ",")
        sOp = GETWORDNUM(.MenuOptions, nOp, ",")
        DEFINE BAR (nOp) OF _Popup_Menu PROMPT (sOp)
        sOp = TRANSFORM(nOp)
        ON SELECTION BAR (nOp) OF _Popup_Menu _SCREEN.ACTIVEFORM.ActivePopupMenu.AfterClick( &sOp )
      NEXT
    ENDWITH

    ACTIVATE POPUP _Popup_Menu
  ENDPROC

  * Borro el menú luego del click y llamo al handler
  PROCEDURE AfterClick(nOption)
    THISFORM.ActivePopupMenu = NULL
    * RELEASE POPUP _Popup_Menu
    THIS.OnMenu (nOption)
    THISFORM.REFRESH()
  ENDPROC

  PROCEDURE OnMenu (nOption)
    WAIT WINDOW "Seleccionó opcion " + TRANSFORM(nOption) + " del botón " + PROPER(THIS.NAME) NOWAIT
  ENDPROC
ENDDEFINE

Mario Lopez

No hay comentarios. :

Publicar un comentario