FreeWidget - ProGUI Reference Manual

Syntax

Success = FreeWidget(Widget)

Description

Removes the specified widget from its parent layout and frees all associated resources. The widget will no longer be visible or interactive, and its handle becomes invalid.

Parameters

Widget
The handle of the ProGUI widget to free.

Return Value

Returns #True if the widget was successfully marked for deletion, or #False if the handle was invalid.

Remarks

This function queues the widget for deletion. The actual removal from the layout and freeing of memory happens during the layout update cycle. If the widget had its own layout assigned (WidgetSetLayout()), that layout and all its contained widgets will also be freed recursively. The #PG_Event_Destroy event is dispatched to the widget just before its resources are released, allowing for custom cleanup.

Example

IncludeFile "ProGUI_PB.pbi"

StartProGUI()

Global WidgetToFree

; Event handler for button click
Procedure ButtonHandler(Widget, EventType, *EventData, *UserData)
  If EventType = #PG_Event_Action
    If WidgetToFree
      Debug "Freeing the widget..."
      FreeWidget(WidgetToFree)
      Debug "Widget marked for deletion."
      WidgetToFree = #Null ; Clear the global handle
    Else
      Debug "Widget already freed."
    EndIf
  EndIf
EndProcedure

; Event handler for the widget being freed
Procedure DestroyHandler(Widget, EventType, *EventData, *UserData)
  If EventType = #PG_Event_Destroy
    Debug "Widget Destroy event received!"
    ; Perform any cleanup related to this specific widget here
  EndIf
EndProcedure

MyWindow = CreateWindow(0, 0, 300, 200, "FreeWidget Example", #PG_Window_Default | #PG_Window_LayoutFlex) ; Create with a flex layout
LayoutFlexSetDirection(#Null, #PG_Flex_Direction_Column) ; Set the flex direction of the current layout
LayoutSetPadding(#Null, 10)

If MyWindow
  ; The widget we will free
  WidgetToFree = CreateWidget(0, 0, 200, 50)
  WidgetSetClass(WidgetToFree, "status-label") ; Assume skin exists
  WidgetSetMargin(WidgetToFree, 5)
  AddEventHandler(WidgetToFree, #PG_Event_Destroy, @DestroyHandler())
  ; Add drawing handler if needed

  ; A button to trigger freeing the widget
  FreeButton = CreateButton(0, 0, 100, 30, "Click to Free!")
  WidgetSetMargin(FreeButton, 5)
  AddEventHandler(FreeButton, #PG_Event_Action, @ButtonHandler())
  ; Add drawing handler if needed

  WindowShow(MyWindow, #True, #PG_WindowShow_ScreenCentered)

  Repeat
    Event = WaitWindowEvent()
  Until Event = #PB_Event_CloseWindow
EndIf

StopProGUI()

Supported OS

Windows, Linux