PureBasic Forums - English

Posted: **Thu May 04, 2017 6:26 am**

Good morning,

maybe its a stupid question, but how can I found out, whether a window is visible or not.

Visible = The user can see the window its not hidden or behind another window.

I would like to open another small alert window, if the User cant see the Main Window.

Thank you in advance for your help

Amnesty

Posted: **Thu May 04, 2017 9:49 am**

Something like this?

Windows only

Code: Select all

EnableExplicit

Procedure ForceWindowIntoForeground(hWnd)
  Protected currentThread, activeWindow, activeProcess, activeThread, windowProcess, windowThread, oldTimeout, newTimeout
  #LSFW_UNLOCK = 2 : #ASFW_ANY = -1
  currentThread = GetCurrentThreadId_();
  activeWindow = GetForegroundWindow_();
  activeThread = GetWindowThreadProcessId_(activeWindow, @activeProcess);
  windowThread = GetWindowThreadProcessId_(hWnd, @windowProcess);
  If currentThread <> activeThread
    AttachThreadInput_(currentThread, activeThread, #True)
  EndIf
  If windowThread <> currentThread
    AttachThreadInput_(windowThread, currentThread, #True)
  EndIf
  oldTimeout = 0
  newTimeout = 0
  SystemParametersInfo_(#SPI_GETFOREGROUNDLOCKTIMEOUT, 0, @oldTimeout, 0);
  SystemParametersInfo_(#SPI_SETFOREGROUNDLOCKTIMEOUT, 0, @newTimeout, 0);
  LockSetForegroundWindow_(#LSFW_UNLOCK);
  AllowSetForegroundWindow_(#ASFW_ANY);
  SetForegroundWindow_(hWnd);
  SystemParametersInfo_(#SPI_SETFOREGROUNDLOCKTIMEOUT, 0, @oldTimeout, 0);
  If currentThread <> activeThread
    AttachThreadInput_(currentThread, activeThread, #False)
  EndIf
  If windowThread <> currentThread
    AttachThreadInput_(windowThread, currentThread, #False)
  EndIf
EndProcedure

Procedure IsWindowPartiallyCovered(hWnd)
  Protected.RECT wRect, tmpRect
  GetWindowRect_(hWnd, wRect)
  Repeat
    hWnd = GetWindow_(hWnd, #GW_HWNDPREV)
    If IsWindowVisible_(hWnd) And GetWindowRect_(hWnd, tmpRect) And IntersectRect_(tmpRect, wRect, tmpRect)
      ProcedureReturn #True
    EndIf
  Until hWnd = 0
  ProcedureReturn #False
EndProcedure

OpenWindow(0, 0, 0, 320, 200, "", #WS_OVERLAPPEDWINDOW|#PB_Window_ScreenCentered)
AddWindowTimer(0, 0, 3000)

Repeat
  Define event = WaitWindowEvent()
  Select event
      
    Case #PB_Event_Timer
      Select EventTimer()
          
        Case 0
          If IsWindowPartiallyCovered(WindowID(0))
            ForceWindowIntoForeground(WindowID(0))
          EndIf
          
      EndSelect
  EndSelect
Until event = #PB_Event_CloseWindow

Posted: **Thu May 04, 2017 11:40 am**

Code: Select all

; Monitor system
; Marc56us - 2017/05/04
; Check every 5 sec if the windows is activated

OpenWindow(0, 0, 0, 500, 300, "Monitor", #PB_Window_SystemMenu | #PB_Window_ScreenCentered)
AddWindowTimer(0, 2, 5000)

Procedure CheckStillOnTop()
     If GetActiveWindow() = -1
          ; I don't know why, but SetActiveWindow(0) does not work here ?
          ; so i use an alternate solution:
          SetWindowState(0, #PB_Window_Minimize)
          SetWindowState(0, #PB_Window_Normal)
     EndIf
EndProcedure

BindEvent(#PB_Event_Timer, @CheckStillOnTop())

While WaitWindowEvent() <> #PB_Event_CloseWindow : Wend

Without SetWindowState(... bindEvent continue to think GetActiveWindow = -1 (why ?)

Posted: **Thu May 04, 2017 12:31 pm**

Work with windows created by PB

Code: Select all

OpenWindow(0, 0, 0, 320, 200, "", #PB_Window_SystemMenu|#PB_Window_ScreenCentered)
ButtonGadget(0,10,170,60,20,"TEST")
OpenWindow(1, 100, 100, 300, 200, "", #PB_Window_SystemMenu)
HideWindow(1,1)

Repeat
  Select WaitWindowEvent()
    Case #PB_Event_CloseWindow
      Quit = 1
      
    Case #PB_Event_Gadget
      Select EventGadget()         
        Case 0
          StickyWindow(1,1)
          StartDrawing(WindowOutput(1))
            Delay(50)
            color = Point(5,5)
            If color > 0
              Debug "Window #1 is visible"
            Else
              Debug "Window #1 is hidden"              
            EndIf
          StopDrawing()
          Delay(1000)
          HideWindow(1,0)
          StartDrawing(WindowOutput(1))
            Delay(50)
            color = Point(5,5)
            If color > 0
              Debug "Window #1 is visible"
            Else
              Debug "Window #1 is hidden"
            EndIf
          StopDrawing()          
      EndSelect
  EndSelect
Until Quit = 1

Posted: **Thu May 04, 2017 12:55 pm**

Servus!

The Hint from Chi works fine, thank you all.

Amnesty

Posted: **Wed Mar 02, 2022 1:06 pm**

Great tip, Chi! Can't believe I missed it 5 years ago.

Posted: **Wed Mar 02, 2022 3:14 pm**

Keep your window visible
Very simple just few lines of code

Code: Select all

OpenWindow(0, 100, 100, 300, 200, "", #PB_Window_SystemMenu|#PB_Window_ScreenCentered)
AddWindowTimer(0,125,5000)

Repeat
  Select WaitWindowEvent()
    Case #PB_Event_CloseWindow
      Quit = 1 
      
    Case #PB_Event_Timer
      If GetForegroundWindow_() <> WindowID(0)
        SendMessage_(#HWND_BROADCAST, #WM_SYSCOMMAND, #SC_HOTKEY, WindowID(0))
      EndIf           

  EndSelect
Until Quit = 1

PureBasic Forums - English

State: Window Visible or not (user can see the window)

State: Window Visible or not (user can see the window)

Re: State: Window Visible or not (user can see the window)

Re: State: Window Visible or not (user can see the window)

Re: State: Window Visible or not (user can see the window)

Re: State: Window Visible or not (user can see the window)

Re: State: Window Visible or not (user can see the window)

Re: State: Window Visible or not (user can see the window)