0028333: Draw Harness - whatis command hangs when selection is activated with no opened view

Added new method Draw_Window::IsMapped() for checked window state.
Draw_Window using XLib now does not exit application on closing window.
The method Draw_Viewer::Select() (called by whatis command)
has been corrected so as not to enter the loop if no views are initialized.

src/Draw/Draw_Viewer.cxx

@@ -941,12 +941,29 @@ Draw_Display Draw_Viewer::MakeDisplay (const Standard_Integer id) const
 //function : Select
 //purpose  :
 //=======================================================================
+
 void Draw_Viewer::Select (Standard_Integer& id, Standard_Integer& X, Standard_Integer& Y,
 			  Standard_Integer& Button, Standard_Boolean wait)
 {
   if (Draw_Batch) return;
+  id = X = Y = Button = 0;
+  Standard_Boolean hasView = Standard_False;
+  for (int aViewIter = 0; aViewIter < MAXVIEW; ++aViewIter)
+  {
+    if (myViews[aViewIter] != NULL
+     && myViews[aViewIter]->IsMapped())
+    {
+      hasView = Standard_True;
+      break;
+    }
+  }
+  if (!hasView)
+  {
+    std::cerr << "No selection is possible with no open views\n";
+    return;
+  }
   Flush();
-#if !defined(_WIN32) && !defined(__WIN32__) && (!defined(__APPLE__) || defined(MACOSX_USE_GLX))
+#if !defined(_WIN32) && (!defined(__APPLE__) || defined(MACOSX_USE_GLX))
   if (!wait) {
     if (id >=0 && id < MAXVIEW) {
       if (myViews[id]) myViews[id]->Wait(wait);

src/Draw/Draw_Window.cxx

@@ -371,6 +371,9 @@ void Draw_Window::Init(Standard_Integer X, Standard_Integer Y,
     // advise to the window manager to place it where I need
     XSetWMNormalHints(Draw_WindowDisplay,win,&myHints);
 
+    Atom aDeleteWindowAtom = Draw_DisplayConnection->GetAtom (Aspect_XA_DELETE_WINDOW);
+    XSetWMProtocols (Draw_WindowDisplay, win, &aDeleteWindowAtom, 1);
+
     if (Draw_VirtualWindows)
     {
       myUseBuffer = Standard_True;
@@ -567,6 +570,25 @@ Standard_Boolean Draw_Window::DefineColor(const Standard_Integer i, const char*
   return Standard_True;
 }
 
+//=======================================================================
+//function : IsMapped
+//purpose  :
+//=======================================================================
+bool Draw_Window::IsMapped() const
+{
+  if (Draw_VirtualWindows
+   || win == 0)
+  {
+    return false;
+  }
+
+  XFlush (Draw_WindowDisplay);
+  XWindowAttributes aWinAttr;
+  XGetWindowAttributes (Draw_WindowDisplay, win, &aWinAttr);
+  return aWinAttr.map_state == IsUnviewable
+      || aWinAttr.map_state == IsViewable;
+}
+
 //=======================================================================
 //function : DisplayWindow
 //purpose  :
@@ -793,9 +815,17 @@ void ProcessEvent(Draw_Window& win, XEvent& xev)
   XComposeStatus stat;
   char chainekey[10];
 
-
-  switch (xev.type) {
-
+  switch (xev.type)
+  {
+  case ClientMessage:
+  {
+    if (xev.xclient.data.l[0] == (int )Draw_DisplayConnection->GetAtom (Aspect_XA_DELETE_WINDOW))
+    {
+      // just hide the window
+      win.Hide();
+    }
+    return;
+  }
   case Expose :
     win.WExpose();
     break;
@@ -1372,6 +1402,11 @@ LRESULT APIENTRY DrawWindow::DrawProc(HWND hWnd, UINT wMsg, WPARAM wParam, LPARA
 
   switch (wMsg)
   {
+    case WM_CLOSE:
+    {
+      localObjet->Hide();
+      return 0; // do nothing - window destruction should be performed by application
+    }
     case WM_PAINT:
     {
       PAINTSTRUCT ps;
@@ -1679,6 +1714,22 @@ TCollection_AsciiString DrawWindow::GetTitle() const
   return TCollection_AsciiString (aTitleW);
 }
 
+//=======================================================================
+//function : IsMapped
+//purpose  :
+//=======================================================================
+bool Draw_Window::IsMapped() const
+{
+  if (Draw_VirtualWindows
+   || win == NULL)
+  {
+    return false;
+  }
+
+  LONG aWinStyle = GetWindowLongW (win, GWL_STYLE);
+  return (aWinStyle & WS_VISIBLE)  != 0
+      && (aWinStyle & WS_MINIMIZE) == 0;
+}
 
 /*--------------------------------------------------------*\
 |  DisplayWindow

src/Draw/Draw_Window.hxx

@@ -120,6 +120,8 @@ class Draw_Window
     void SetTitle (const TCollection_AsciiString& theTitle);
     TCollection_AsciiString GetTitle() const;
 
+    //! Return true if window is displayed on the screen.
+    bool IsMapped() const;
     void DisplayWindow();
     void Hide();
     void Destroy();
@@ -285,6 +287,8 @@ class Draw_Window
   void  SetTitle (const TCollection_AsciiString& theTitle);
   TCollection_AsciiString GetTitle() const;
 
+  //! Return true if window is displayed on the screen.
+  bool IsMapped() const;
   void DisplayWindow();
   void Hide();
   void Destroy();
@@ -448,6 +452,8 @@ public:
   __Draw_API TCollection_AsciiString GetTitle() const;
 
   //Affichage
+    //! Return true if window is displayed on the screen.
+    bool IsMapped() const;
   __Draw_API void DisplayWindow();
   __Draw_API void Hide();
   __Draw_API void Destroy();

src/Draw/Draw_Window_1.mm

@@ -327,6 +327,21 @@ Standard_Boolean Draw_Window::DefineColor (const Standard_Integer&, Standard_CSt
   return Standard_True; // unused
 }
 
+//=======================================================================
+//function : IsMapped
+//purpose  :
+//=======================================================================
+bool Draw_Window::IsMapped() const
+{
+  if (Draw_VirtualWindows
+   || myWindow == NULL)
+  {
+    return false;
+  }
+
+  return [myWindow isVisible];
+}
+
 //=======================================================================
 //function : DisplayWindow
 //purpose  :