OpenEdge Development:<br />Progress 4GL Reference DELETE WIDGET-POOL statement

DELETE WIDGET-POOL [ `pool-name` ] [ NO-ERROR ]

The name of a defined dynamic widget pool. If you omit pool-name, the statement deletes the unnamed pool most recently created in the current or a calling procedure.

Suppresses error messages if the specified widget pool does not exist. You can then test for the ERROR condition to verify that the widget pool does not exist.

The following example creates a named widget pool and lets you add buttons to it. When you choose Delete Buttons, the widget pool is deleted. (Therefore all the buttons in the pool are also deleted.) Similarly, when you choose Quit to exit the procedure the widget pool is also deleted. Because the pool is persistent, it remains allocated for the rest of your session if you do not delete it.

r-widpl.p
DEFINE VARIABLE wh AS WIDGET-HANDLE. DEFINE BUTTON b_create LABEL "Create Button". DEFINE BUTTON b_del LABEL "Delete Buttons". DEFINE BUTTON b_quit LABEL "Quit" TRIGGERS: ON CHOOSE DO: IF VALID-HANDLE(wh) THEN DELETE WIDGET-POOL "new-buttons". QUIT. END. END. DEFINE FRAME butt-frame b_create b_del b_quit WITH ROW SCREEN-LINES - 2. DEFINE FRAME new-buttons WITH SIZE 76 BY 11 CENTERED ROW 2 TITLE "New Buttons". ON CHOOSE OF b_create IN FRAME butt-frame DO: STATUS INPUT "Press RETURN to select a new button". IF wh = ? OR NOT VALID-HANDLE(wh) THEN CREATE WIDGET-POOL "new-buttons" PERSISTENT. CREATE BUTTON wh IN WIDGET-POOL "new-buttons" ASSIGN FRAME = FRAME new-buttons:HANDLE ROW = RANDOM(2, 9) COLUMN = RANDOM(2, 58) LABEL = "BUTTON " + STRING(etime) SENSITIVE = TRUE VISIBLE = TRUE MOVABLE = TRUE TRIGGERS: ON CHOOSE PERSISTENT RUN dispmsg. END. END. ON CHOOSE OF b_del IN FRAME butt-frame DO: IF VALID-HANDLE(wh) THEN DELETE WIDGET-POOL "new-buttons". STATUS INPUT. END.ENABLE b_create b_del b_quit WITH FRAME butt-frame. WAIT-FOR CHOOSE OF b_quit IN FRAME butt-frame. PROCEDURE dispmsg: MESSAGE "You chose button " SELF:LABEL. END.

r-widpl.p

DEFINE VARIABLE wh AS WIDGET-HANDLE.
DEFINE BUTTON b_create LABEL "Create Button".
DEFINE BUTTON b_del    LABEL "Delete Buttons".
DEFINE BUTTON b_quit LABEL "Quit"
  TRIGGERS:
    ON CHOOSE
    DO:
      IF VALID-HANDLE(wh) THEN DELETE WIDGET-POOL "new-buttons".
      QUIT.
    END.
  END.
  
DEFINE FRAME butt-frame
  b_create b_del b_quit
  WITH ROW SCREEN-LINES - 2.
DEFINE FRAME new-buttons
  WITH SIZE 76 BY 11 CENTERED ROW 2 TITLE "New Buttons".

ON CHOOSE OF b_create IN FRAME butt-frame
DO:
  STATUS INPUT "Press RETURN to select a new button".
  IF wh = ? OR NOT VALID-HANDLE(wh) THEN
    CREATE WIDGET-POOL "new-buttons" PERSISTENT.
  CREATE BUTTON wh IN WIDGET-POOL "new-buttons"
    ASSIGN FRAME = FRAME new-buttons:HANDLE
      ROW = RANDOM(2, 9)
      COLUMN = RANDOM(2, 58)
      LABEL = "BUTTON " + STRING(etime)
      SENSITIVE = TRUE
      VISIBLE = TRUE
      MOVABLE = TRUE
      TRIGGERS:
        ON CHOOSE PERSISTENT RUN dispmsg.
      END.
END.
ON CHOOSE OF b_del IN FRAME butt-frame
DO:
  IF VALID-HANDLE(wh) THEN DELETE WIDGET-POOL "new-buttons".
  STATUS INPUT. 
END.ENABLE b_create b_del b_quit WITH FRAME butt-frame.
WAIT-FOR CHOOSE OF b_quit IN FRAME butt-frame.

PROCEDURE dispmsg:
  MESSAGE "You chose button " SELF:LABEL.
END.

Notes

When you delete a widget pool, all widgets in that pool are automatically deleted.

If you do not delete a non-persistent widget pool, it is deleted when the procedure that created it ends. If you do not delete a persistent widget pool, it is deleted when the session ends.

All named widget pools are globally scoped. While a named widget pool is allocated, any procedure within the same process can access that widget pool. If you try to delete a named widget pool that does not exist, Progress raises the ERROR condition.

DELETE WIDGET-POOL statement

Syntax

Notes

See also