allow windows which are placed inside wxStaticBoxes to be built as children of the wxStaticBox itself rather than forcing users to build them as siblings of the static box (closes #9859)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60335 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -284,6 +284,11 @@ Deprecated methods and their replacements
   documented TryBefore/After() methods if you used to override these ones.
 - wxGetMultipleChoices() is deprecated, use wxGetSelectedChoices() which has
   the same signature but returns -1 and not 0 if the dialog was cancelled.
+- building the windows which are placed inside wxStaticBoxes as siblings of the
+  wxStaticBox is still allowed but it's deprecated as it gives some problems
+  on some ports (e.g. wxGTK).
+  You should now create windows placed inside a wxStaticBox as children of
+  the static box itself.
 
 Major new features in this release
 ----------------------------------

include/wx/gtk/statbox.h

@@ -44,6 +44,8 @@ public:
 
     virtual void GetBordersForSizer(int *borderTop, int *borderOther) const;
 
+    virtual void AddChild( wxWindowBase *child );
+
 protected:
     virtual bool GTKWidgetNeedsMnemonic() const;
     virtual void GTKWidgetDoSetMnemonic(GtkWidget* w);

interface/wx/sizer.h

@@ -1643,6 +1643,19 @@ public:
     itself as a convenience. In any case, the sizer owns the wxStaticBox control
     and will delete it in the wxStaticBoxSizer destructor.
     
+    Note that since wxWidgets 2.9.0 you are encouraged to build the windows which are
+    placed inside wxStaticBoxes as children of the wxStaticBox itself:
+    @code
+        ...
+        wxStaticBoxSizer *sz = new wxStaticBoxSizer(wxVERTICAL, parentWindow, "StaticBox");
+        sz->Add(new wxStaticText(sz->GetStaticBox(), "This window is a child of the staticbox"));
+        ...
+    @endcode
+    
+    Creating the windows which are placed inside wxStaticBoxes as siblings of the
+    wxStaticBox is still allowed but it's deprecated as it gives some problems
+    (e.g. relative to tooltips) on some ports.
+
     @library{wxcore}
     @category{winlayout}
 

interface/wx/statbox.h

@@ -12,18 +12,22 @@
     A static box is a rectangle drawn around other windows to denote
     a logical grouping of items.
 
-    Please note that a static box should @b not be used as the parent for the
-    controls it contains, instead they should be @b siblings of each other.
-    Although using a static box as a parent might work in some ports of wxWidgets,
-    it would result in a crash under, for example, wxGTK, and thus it's explicitely
-    disallowed (an assertion will fail if you try to add children to a wxStaticBox).
+    Note that since wxWidgets 2.9.0 you are encouraged to build the windows which are
+    placed inside wxStaticBoxes as children of the wxStaticBox itself:
+    @code
+        ...
+        wxStaticBox *stbox = new wxStaticBox(parentWindow, wxID_ANY, "StaticBox");
 
-    Also, please note that because of this, the order in which you create new
-    controls is important. Create your wxStaticBox control @b before any
-    siblings that are to appear inside the wxStaticBox in order to preserve the
-    correct Z-order of controls.
+        new wxStaticText(stbox, "This window is a child of the staticbox");
+        ...
+    @endcode
     
-    You may want to use wxStaticBoxSizer instead of wxStaticBox to avoid this problem.
+    Creating the windows which are placed inside wxStaticBoxes as siblings of the
+    wxStaticBox is still allowed but it's deprecated as it gives some problems
+    (e.g. relative to tooltips) on some ports.
+    
+    Also note that there is a specialized wxSizer class (wxStaticBoxSizer) which can
+    be used as an easier way to pack items into a static box.
 
     @library{wxcore}
     @category{ctrl}

src/common/wincmn.cpp

@@ -217,17 +217,6 @@ bool wxWindowBase::CreateBase(wxWindowBase *parent,
                               const wxValidator& wxVALIDATOR_PARAM(validator),
                               const wxString& name)
 {
-#if wxUSE_STATBOX
-    // wxGTK doesn't allow to create controls with static box as the parent so
-    // this will result in a crash when the program is ported to wxGTK so warn
-    // the user about it
-
-    // if you get this assert, the correct solution is to create the controls
-    // as siblings of the static box
-    wxASSERT_MSG( !parent || !wxDynamicCast(parent, wxStaticBox),
-                  _T("wxStaticBox can't be used as a window parent!") );
-#endif // wxUSE_STATBOX
-
     // ids are limited to 16 bits under MSW so if you care about portability,
     // it's not a good idea to use ids out of this range (and negative ids are
     // reserved for wxWidgets own usage)

src/gtk/statbox.cpp

@@ -13,6 +13,7 @@
 #if wxUSE_STATBOX
 
 #include "wx/statbox.h"
+#include "wx/gtk/private/win_gtk.h"     // for wxPizza
 
 #include <gtk/gtk.h>
 
@@ -31,7 +32,9 @@ static void size_allocate(GtkWidget* widget, GtkAllocation* alloc, void*)
     GtkWidget* label_widget = gtk_frame_get_label_widget(GTK_FRAME(widget));
     int w = alloc->width -
         2 * widget->style->xthickness - 2 * LABEL_PAD - 2 * LABEL_SIDE_PAD;
-    if (w < 0) w = 0;
+    if (w < 0) 
+        w = 0;
+
     if (label_widget->allocation.width > w)
     {
         GtkAllocation alloc2 = label_widget->allocation;
@@ -79,6 +82,7 @@ bool wxStaticBox::Create( wxWindow *parent,
 
     m_widget = GTKCreateFrame(label);
     g_object_ref(m_widget);
+
     // only base SetLabel needs to be called after GTKCreateFrame
     wxControl::SetLabel(label);
 
@@ -97,14 +101,27 @@ bool wxStaticBox::Create( wxWindow *parent,
 
     if (gtk_check_version(2, 12, 0))
     {
-        // for clipping label as GTK >= 2.12 does
-        g_signal_connect(m_widget, "size_allocate",
-            G_CALLBACK(size_allocate), NULL);
+        // we connect this signal to perform label-clipping as GTK >= 2.12 does
+        g_signal_connect(m_widget, "size_allocate", G_CALLBACK(size_allocate), NULL);
     }
 
     return true;
 }
 
+void wxStaticBox::AddChild( wxWindowBase *child )
+{
+    if (!m_wxwindow)
+    {
+        // make this window a container of other wxWindows by instancing a wxPizza
+        // and packing it into the GtkFrame:
+        m_wxwindow = wxPizza::New( 0, this );
+        gtk_widget_show( m_wxwindow );
+        gtk_container_add( GTK_CONTAINER (m_widget), m_wxwindow );
+    }
+
+    wxWindow::AddChild( child );
+}
+
 void wxStaticBox::SetLabel( const wxString& label )
 {
     wxCHECK_RET( m_widget != NULL, wxT("invalid staticbox") );