You can put it inside a ContainerGadget. It's not perfect - the colour is still lighter than the scrollbars, but it's not white, at least. SetGadgetColor() only seems to affect the left and top edges of that space for some reason.
Code: Select all
OpenWindow(0, 30, 30, 500, 400, "Demo1", #PB_Window_SystemMenu | #PB_Window_MinimizeGadget)
SetWindowColor(0, 0)
ContainerGadget(0, 120, 60, 300, 100)
EditorGadget(1, 0, 0, 300, 100)
CloseGadgetList()
SetGadgetText(1, "Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow" + #CRLF$ + #CRLF$ +#CRLF$ +#CRLF$ +#CRLF$ )
SetGadgetColor(0, #PB_Gadget_BackColor, RGB(0, 0, 0))
SetGadgetColor(1, #PB_Gadget_BackColor,  $323232)
SetGadgetColor(1, #PB_Gadget_FrontColor, $F2F2F2)
SetWindowTheme_(GadgetID(1), "DarkMode_Explorer", 0)
Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow 
Here's a way using a callback. I'm not sure if I've done it all right - somebody more knowledgable with the Windows API might know, but it seems to work.
Code: Select all
EnableExplicit
Global proc
Procedure EditorCallback(hWnd, uMsg, wParam, lParam) 
  Select uMsg
    Case #WM_PAINT
      Define rc.Rect, hDC, hBrush, scrollX, scrollY
      CallWindowProc_(proc, hWnd, uMsg, wParam, lParam) 
      hDC = GetDC_(hWnd)
      GetClientRect_(hWnd, @rc)
      scrollX = GetSystemMetrics_(#SM_CXHSCROLL)
      scrollY = GetSystemMetrics_(#SM_CXVSCROLL)
      rc\left = rc\right
      rc\top = rc\bottom
      rc\right + scrollX
      rc\bottom + scrollY
      hBrush = CreateSolidBrush_(RGB(0, 0, 0))
      FillRect_(hDC, rc, hBrush)
      SetBkMode_(hDC, #TRANSPARENT)
      DeleteObject_(hBrush)
      ReleaseDC_(hWnd, hDC)
      ProcedureReturn 0 
  EndSelect 
  ProcedureReturn CallWindowProc_(proc, hWnd, uMsg, wParam, lParam) 
EndProcedure
OpenWindow(0, 30, 30, 500, 400, "Demo1", #PB_Window_SystemMenu | #PB_Window_MinimizeGadget)
SetWindowColor(0, 0)
EditorGadget(1, 120, 60, 300, 100)
SetGadgetText(1, "Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow" + #CRLF$ + #CRLF$ +#CRLF$ +#CRLF$ +#CRLF$ )
SetGadgetColor(1, #PB_Gadget_BackColor,  $323232)
SetGadgetColor(1, #PB_Gadget_FrontColor, $F2F2F2)
SetWindowTheme_(GadgetID(1), "DarkMode_Explorer", 0)
proc = SetWindowLong_(GadgetID(1), #GWL_WNDPROC, @EditorCallback()) 
Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow