X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c1ef87c33d21f834a55f106324d5a6de4b9600cb..ea412ac4eb9f19e3c28dfa32aa9099a81ac7c74c:/src/gtk/settings.cpp

diff --git a/src/gtk/settings.cpp b/src/gtk/settings.cpp
index ec65276d9c..7de06c56e3 100644
--- a/src/gtk/settings.cpp
+++ b/src/gtk/settings.cpp
@@ -1,365 +1,439 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        gtk/settings.cpp
+// Name:        src/gtk/settings.cpp
 // Purpose:
 // Author:      Robert Roebling
+// Modified by: Mart Raudsepp (GetMetric)
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "settings.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #include "wx/settings.h"
-#include "wx/debug.h"
-#include "wx/module.h"
-#include "wx/cmndata.h"
-#include "wx/fontutil.h"
-
-#include <gdk/gdk.h>
-#include <gdk/gdkprivate.h>
-#include <gtk/gtk.h>
-
-#define SHIFT (8*(sizeof(short int)-sizeof(char)))
-
-// ----------------------------------------------------------------------------
-// wxSystemSettingsModule
-// ----------------------------------------------------------------------------
 
-class wxSystemSettingsModule : public wxModule
-{
-public:
-    virtual bool OnInit() { ms_instance = this; return TRUE; }
-    virtual void OnExit() { ms_instance = NULL; }
-
-    static wxSystemSettingsModule *ms_instance;
-
-    wxColour m_colBtnFace,
-             m_colBtnShadow,
-             m_colBtnHighlight,
-             m_colHighlight,
-             m_colHighlightText,
-             m_colListBox,
-             m_colBtnText;
-
-    wxFont m_fontSystem;
+#ifndef WX_PRECOMP
+    #include "wx/cmndata.h"
+    #include "wx/toplevel.h"
+#endif
 
-private:
-    DECLARE_DYNAMIC_CLASS(wxSystemSettingsModule)
-};
+#include "wx/fontutil.h"
+#include "wx/fontenum.h"
 
-IMPLEMENT_DYNAMIC_CLASS(wxSystemSettingsModule, wxModule)
+#include <gtk/gtk.h>
+#include "wx/gtk/private/win_gtk.h"
 
-wxSystemSettingsModule *wxSystemSettingsModule::ms_instance = NULL;
+bool wxGetFrameExtents(GdkWindow* window, int* left, int* right, int* top, int* bottom);
 
 // ----------------------------------------------------------------------------
 // wxSystemSettings implementation
 // ----------------------------------------------------------------------------
 
-// kind of widget to use in GetColourFromGTKWidget
-enum wxGtkWidgetType
-{
-    wxGTK_BUTTON,
-    wxGTK_LIST
-};
+static wxFont gs_fontSystem;
 
-// the colour we need
-enum wxGtkColourType
-{
-    wxGTK_FG,
-    wxGTK_BG,
-    wxGTK_BASE
-};
-
-// wxSystemSettings::GetColour() helper: get the colours from a GTK+
-// widget style, return true if we did get them, false to use defaults
-static bool GetColourFromGTKWidget(int& red, int& green, int& blue,
-                                   wxGtkWidgetType type = wxGTK_BUTTON,
-                                   GtkStateType state = GTK_STATE_NORMAL,
-                                   wxGtkColourType colour = wxGTK_BG)
+static GtkContainer* ContainerWidget()
 {
-    GtkWidget *widget;
-    switch ( type )
+    static GtkContainer* s_widget;
+    if (s_widget == NULL)
     {
-        default:
-            wxFAIL_MSG( _T("unexpected GTK widget type") );
-            // fall through
-
-        case wxGTK_BUTTON:
-            widget = gtk_button_new();
-            break;
-
-        case wxGTK_LIST:
-            widget = gtk_list_new();
+        s_widget = GTK_CONTAINER(gtk_fixed_new());
+        GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+        gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(s_widget));
     }
+    return s_widget;
+}
 
-    GtkStyle *def = gtk_rc_get_style( widget );
-    if ( !def )
-        def = gtk_widget_get_default_style();
+extern "C" {
+static void style_set(GtkWidget*, GtkStyle*, void*)
+{
+    gs_fontSystem = wxNullFont;
+}
+}
 
-    bool ok;
-    if ( def )
+static const GtkStyle* ButtonStyle()
+{
+    static GtkWidget* s_widget;
+    if (s_widget == NULL)
     {
-        GdkColor *col;
-        switch ( colour )
-        {
-            default:
-                wxFAIL_MSG( _T("unexpected GTK colour type") );
-                // fall through
-
-            case wxGTK_FG:
-                col = def->fg;
-                break;
-
-            case wxGTK_BG:
-                col = def->bg;
-                break;
-
-            case wxGTK_BASE:
-                col = def->base;
-                break;
-        }
+        s_widget = gtk_button_new();
+        gtk_container_add(ContainerWidget(), s_widget);
+        gtk_widget_ensure_style(s_widget);
+        g_signal_connect(s_widget, "style_set", G_CALLBACK(style_set), NULL);
+    }
+    return s_widget->style;
+}
 
-        red = col[state].red;
-        green = col[state].green;
-        blue = col[state].blue;
+static const GtkStyle* ListStyle()
+{
+    static GtkWidget* s_widget;
+    if (s_widget == NULL)
+    {
+        s_widget = gtk_tree_view_new_with_model(
+            GTK_TREE_MODEL(gtk_list_store_new(1, G_TYPE_INT)));
+        gtk_container_add(ContainerWidget(), s_widget);
+        gtk_widget_ensure_style(s_widget);
+    }
+    return s_widget->style;
+}
 
-        ok = TRUE;
+static const GtkStyle* TextCtrlStyle()
+{
+    static GtkWidget* s_widget;
+    if (s_widget == NULL)
+    {
+        s_widget = gtk_text_view_new();
+        gtk_container_add(ContainerWidget(), s_widget);
+        gtk_widget_ensure_style(s_widget);
     }
-    else
+    return s_widget->style;
+}
+
+static const GtkStyle* MenuItemStyle()
+{
+    static GtkWidget* s_widget;
+    if (s_widget == NULL)
     {
-        ok = FALSE;
+        s_widget = gtk_menu_item_new();
+        gtk_container_add(ContainerWidget(), s_widget);
+        gtk_widget_ensure_style(s_widget);
     }
+    return s_widget->style;
+}
 
-    gtk_widget_destroy( widget );
+static const GtkStyle* MenuBarStyle()
+{
+    static GtkWidget* s_widget;
+    if (s_widget == NULL)
+    {
+        s_widget = gtk_menu_bar_new();
+        gtk_container_add(ContainerWidget(), s_widget);
+        gtk_widget_ensure_style(s_widget);
+    }
+    return s_widget->style;
+}
 
-    return ok;
+static const GtkStyle* ToolTipStyle()
+{
+    static GtkWidget* s_widget;
+    if (s_widget == NULL)
+    {
+        s_widget = gtk_window_new(GTK_WINDOW_POPUP);
+        const char* name = "gtk-tooltip";
+        if (gtk_check_version(2, 11, 0))
+            name = "gtk-tooltips";
+        gtk_widget_set_name(s_widget, name);
+        gtk_widget_ensure_style(s_widget);
+    }
+    return s_widget->style;
 }
 
 wxColour wxSystemSettingsNative::GetColour( wxSystemColour index )
 {
+    wxColor color;
     switch (index)
     {
         case wxSYS_COLOUR_SCROLLBAR:
         case wxSYS_COLOUR_BACKGROUND:
-        case wxSYS_COLOUR_ACTIVECAPTION:
+        //case wxSYS_COLOUR_DESKTOP:
         case wxSYS_COLOUR_INACTIVECAPTION:
         case wxSYS_COLOUR_MENU:
         case wxSYS_COLOUR_WINDOWFRAME:
         case wxSYS_COLOUR_ACTIVEBORDER:
         case wxSYS_COLOUR_INACTIVEBORDER:
         case wxSYS_COLOUR_BTNFACE:
-        case wxSYS_COLOUR_MENUBAR:
+        //case wxSYS_COLOUR_3DFACE:
         case wxSYS_COLOUR_3DLIGHT:
-            if (!wxSystemSettingsModule::ms_instance->m_colBtnFace.Ok())
-            {
-                int red, green, blue;
-                if ( !GetColourFromGTKWidget(red, green, blue) )
-                {
-                    red =
-                    green = 0;
-                    blue = 0x9c40;
-                }
-
-                wxSystemSettingsModule::ms_instance->m_colBtnFace = wxColour( red   >> SHIFT,
-                                                   green >> SHIFT,
-                                                   blue  >> SHIFT );
-            }
-            return wxSystemSettingsModule::ms_instance->m_colBtnFace;
+            color = wxColor(ButtonStyle()->bg[GTK_STATE_NORMAL]);
+            break;
 
         case wxSYS_COLOUR_WINDOW:
-            return *wxWHITE;
+            color = wxColor(TextCtrlStyle()->base[GTK_STATE_NORMAL]);
+            break;
+
+        case wxSYS_COLOUR_MENUBAR:
+            color = wxColor(MenuBarStyle()->bg[GTK_STATE_NORMAL]);
+            break;
 
         case wxSYS_COLOUR_3DDKSHADOW:
-            return *wxBLACK;
+            color = *wxBLACK;
+            break;
 
         case wxSYS_COLOUR_GRAYTEXT:
         case wxSYS_COLOUR_BTNSHADOW:
         //case wxSYS_COLOUR_3DSHADOW:
-            if (!wxSystemSettingsModule::ms_instance->m_colBtnShadow.Ok())
             {
                 wxColour faceColour(GetColour(wxSYS_COLOUR_3DFACE));
-                wxSystemSettingsModule::ms_instance->m_colBtnShadow =
-                   wxColour((unsigned char) (faceColour.Red() * 0.666),
-                            (unsigned char) (faceColour.Green() * 0.666),
-                            (unsigned char) (faceColour.Blue() * 0.666));
+                color =
+                   wxColour((unsigned char) (faceColour.Red() * 2 / 3),
+                            (unsigned char) (faceColour.Green() * 2 / 3),
+                            (unsigned char) (faceColour.Blue() * 2 / 3));
             }
+            break;
 
-            return wxSystemSettingsModule::ms_instance->m_colBtnShadow;
-
-        case wxSYS_COLOUR_3DHIGHLIGHT:
-        //case wxSYS_COLOUR_BTNHIGHLIGHT:
-            return * wxWHITE;
+        case wxSYS_COLOUR_BTNHIGHLIGHT:
+        //case wxSYS_COLOUR_BTNHILIGHT:
+        //case wxSYS_COLOUR_3DHIGHLIGHT:
+        //case wxSYS_COLOUR_3DHILIGHT:
+            color = *wxWHITE;
+            break;
 
         case wxSYS_COLOUR_HIGHLIGHT:
-            if (!wxSystemSettingsModule::ms_instance->m_colHighlight.Ok())
-            {
-                int red, green, blue;
-                if ( !GetColourFromGTKWidget(red, green, blue,
-                                             wxGTK_BUTTON,
-                                             GTK_STATE_SELECTED) )
-                {
-                    red =
-                    green = 0;
-                    blue = 0x9c40;
-                }
-
-                wxSystemSettingsModule::ms_instance->m_colHighlight = wxColour( red   >> SHIFT,
-                                                        green >> SHIFT,
-                                                        blue  >> SHIFT );
-            }
-            return wxSystemSettingsModule::ms_instance->m_colHighlight;
+            color = wxColor(ButtonStyle()->bg[GTK_STATE_SELECTED]);
+            break;
 
         case wxSYS_COLOUR_LISTBOX:
-            if (!wxSystemSettingsModule::ms_instance->m_colListBox.Ok())
-            {
-                int red, green, blue;
-                if ( GetColourFromGTKWidget(red, green, blue,
-                                            wxGTK_LIST,
-                                            GTK_STATE_NORMAL,
-                                            wxGTK_BASE) )
-                {
-                    wxSystemSettingsModule::ms_instance->m_colListBox = wxColour( red   >> SHIFT,
-                                                          green >> SHIFT,
-                                                          blue  >> SHIFT );
-                }
-                else
-                {
-                    wxSystemSettingsModule::ms_instance->m_colListBox = wxColour(*wxWHITE);
-                }
-            }
-            return wxSystemSettingsModule::ms_instance->m_colListBox;
+            color = wxColor(ListStyle()->base[GTK_STATE_NORMAL]);
+            break;
+
+        case wxSYS_COLOUR_LISTBOXTEXT:
+            color = wxColor(ListStyle()->text[GTK_STATE_NORMAL]);
+            break;
 
         case wxSYS_COLOUR_MENUTEXT:
         case wxSYS_COLOUR_WINDOWTEXT:
         case wxSYS_COLOUR_CAPTIONTEXT:
         case wxSYS_COLOUR_INACTIVECAPTIONTEXT:
         case wxSYS_COLOUR_BTNTEXT:
-        case wxSYS_COLOUR_INFOTEXT:
-            if (!wxSystemSettingsModule::ms_instance->m_colBtnText.Ok())
-            {
-                int red, green, blue;
-                if ( !GetColourFromGTKWidget(red, green, blue,
-                                             wxGTK_BUTTON,
-                                             GTK_STATE_NORMAL,
-                                             wxGTK_FG) )
-                {
-                    red =
-                    green =
-                    blue = 0;
-                }
-
-                wxSystemSettingsModule::ms_instance->m_colBtnText = wxColour( red   >> SHIFT,
-                                                      green >> SHIFT,
-                                                      blue  >> SHIFT );
-            }
-            return wxSystemSettingsModule::ms_instance->m_colBtnText;
+            color = wxColor(ButtonStyle()->fg[GTK_STATE_NORMAL]);
+            break;
 
-            // this (as well as wxSYS_COLOUR_INFOTEXT above) is used for
-            // tooltip windows - Robert, please change this code to use the
-            // real GTK tooltips when/if you can (TODO)
         case wxSYS_COLOUR_INFOBK:
-            return wxColour(255, 255, 225);
+            color = wxColor(ToolTipStyle()->bg[GTK_STATE_NORMAL]);
+            break;
+
+        case wxSYS_COLOUR_INFOTEXT:
+            color = wxColor(ToolTipStyle()->fg[GTK_STATE_NORMAL]);
+            break;
 
         case wxSYS_COLOUR_HIGHLIGHTTEXT:
-            if (!wxSystemSettingsModule::ms_instance->m_colHighlightText.Ok())
-            {
-                wxColour hclr = GetColour(wxSYS_COLOUR_HIGHLIGHT);
-                if (hclr.Red() > 200 && hclr.Green() > 200 && hclr.Blue() > 200)
-                    wxSystemSettingsModule::ms_instance->m_colHighlightText = wxColour(*wxBLACK);
-                else
-                    wxSystemSettingsModule::ms_instance->m_colHighlightText = wxColour(*wxWHITE);
-            }
-            return wxSystemSettingsModule::ms_instance->m_colHighlightText;
+            color = wxColor(ButtonStyle()->fg[GTK_STATE_SELECTED]);
+            break;
 
         case wxSYS_COLOUR_APPWORKSPACE:
-            return *wxWHITE;    // ?
+            color = *wxWHITE;    // ?
+            break;
+
+        case wxSYS_COLOUR_ACTIVECAPTION:
+        case wxSYS_COLOUR_MENUHILIGHT:
+            color = wxColor(MenuItemStyle()->bg[GTK_STATE_SELECTED]);
+            break;
 
         case wxSYS_COLOUR_HOTLIGHT:
         case wxSYS_COLOUR_GRADIENTACTIVECAPTION:
         case wxSYS_COLOUR_GRADIENTINACTIVECAPTION:
-        case wxSYS_COLOUR_MENUHILIGHT:
             // TODO
-            return *wxBLACK;
+            color = *wxBLACK;
+            break;
 
         case wxSYS_COLOUR_MAX:
         default:
-            wxFAIL_MSG( _T("unknown system colour index") );
-  }
+            wxFAIL_MSG( wxT("unknown system colour index") );
+            color = *wxWHITE;
+            break;
+    }
 
-  return *wxWHITE;
+    wxASSERT(color.IsOk());
+    return color;
 }
 
 wxFont wxSystemSettingsNative::GetFont( wxSystemFont index )
 {
+    wxFont font;
     switch (index)
     {
         case wxSYS_OEM_FIXED_FONT:
         case wxSYS_ANSI_FIXED_FONT:
         case wxSYS_SYSTEM_FIXED_FONT:
-        {
-            return *wxNORMAL_FONT;
-        }
+            font = *wxNORMAL_FONT;
+            break;
+
         case wxSYS_ANSI_VAR_FONT:
         case wxSYS_SYSTEM_FONT:
         case wxSYS_DEVICE_DEFAULT_FONT:
         case wxSYS_DEFAULT_GUI_FONT:
-        {
-            if (!wxSystemSettingsModule::ms_instance->m_fontSystem.Ok())
+            if (!gs_fontSystem.Ok())
             {
-#ifdef __WXGTK20__
-                GtkWidget *widget = gtk_button_new();
-                GtkStyle *def = gtk_rc_get_style( widget );
-                if ( !def || !def->font_desc )
-                    def = gtk_widget_get_default_style();  
-                if ( def && def->font_desc )
-                {  
-                    wxNativeFontInfo info;  
-                    info.description = def->font_desc;  
-                    wxSystemSettingsModule::ms_instance->m_fontSystem = wxFont(info);  
-                }  
-                else  
-                {  
-                    const gchar *font_name =
-                        _gtk_rc_context_get_default_font_name(gtk_settings_get_default());
-                    wxSystemSettingsModule::ms_instance->m_fontSystem = wxFont(wxString::FromAscii(font_name));
-                }  
-                gtk_widget_destroy( widget );
-#else
-                wxSystemSettingsModule::ms_instance->m_fontSystem = wxFont( 12, wxSWISS, wxNORMAL, wxNORMAL );
-#endif
+                wxNativeFontInfo info;
+                info.description = ButtonStyle()->font_desc;
+                gs_fontSystem = wxFont(info);
+
+                // (try to) heal the default font (on some common systems e.g. Ubuntu
+                // it's "Sans Serif" but the real font is called "Sans"):
+                if (!wxFontEnumerator::IsValidFacename(gs_fontSystem.GetFaceName()) &&
+                    gs_fontSystem.GetFaceName() == "Sans Serif")
+                    gs_fontSystem.SetFaceName("Sans");
+
+                info.description = NULL;
             }
-            return wxSystemSettingsModule::ms_instance->m_fontSystem;
-        }
+            font = gs_fontSystem;
+            break;
 
         default:
-            return wxNullFont;
+            break;
     }
+
+    wxASSERT(font.IsOk() && wxFontEnumerator::IsValidFacename(font.GetFaceName()));
+
+    return font;
+}
+
+// helper: return the GtkSettings either for the screen the current window is
+// on or for the default screen if window is NULL
+static GtkSettings *GetSettingsForWindowScreen(GdkWindow *window)
+{
+    return window ? gtk_settings_get_for_screen(gdk_drawable_get_screen(window))
+                  : gtk_settings_get_default();
 }
 
-int wxSystemSettingsNative::GetMetric( wxSystemMetric index )
+static int GetBorderWidth(wxSystemMetric index, wxWindow* win)
 {
+    if (win->m_wxwindow)
+    {
+        wxPizza* pizza = WX_PIZZA(win->m_wxwindow);
+        int x, y;
+        pizza->get_border_widths(x, y);
+        switch (index)
+        {
+            case wxSYS_BORDER_X:
+            case wxSYS_EDGE_X:
+            case wxSYS_FRAMESIZE_X:
+                return x;
+            default:
+                return y;
+        }
+    }
+    return -1;
+}
+
+int wxSystemSettingsNative::GetMetric( wxSystemMetric index, wxWindow* win )
+{
+    GdkWindow *window = NULL;
+    if(win && GTK_WIDGET_REALIZED(win->GetHandle()))
+        window = win->GetHandle()->window;
+
     switch (index)
     {
-        case wxSYS_SCREEN_X:   return gdk_screen_width();
-        case wxSYS_SCREEN_Y:   return gdk_screen_height();
-        case wxSYS_HSCROLL_Y:  return 15;
-        case wxSYS_VSCROLL_X:  return 15;
-
-        // VZ: is there any way to get the cursor size with GDK?
-        case wxSYS_CURSOR_X:   return 16;
-        case wxSYS_CURSOR_Y:   return 16;
-        // MBN: ditto for icons
-        case wxSYS_ICON_X:     return 32;
-        case wxSYS_ICON_Y:     return 32;
-        default:               
-            wxFAIL_MSG( wxT("wxSystemSettings::GetMetric not fully implemented") );
+        case wxSYS_BORDER_X:
+        case wxSYS_BORDER_Y:
+        case wxSYS_EDGE_X:
+        case wxSYS_EDGE_Y:
+        case wxSYS_FRAMESIZE_X:
+        case wxSYS_FRAMESIZE_Y:
+            if (win)
+            {
+                wxTopLevelWindow *tlw = wxDynamicCast(win, wxTopLevelWindow);
+                if (!tlw)
+                    return GetBorderWidth(index, win);
+                else if (window)
+                {
+                    // Get the frame extents from the windowmanager.
+                    // In most cases the top extent is the titlebar, so we use the bottom extent
+                    // for the heights.
+                    int right, bottom;
+                    if (wxGetFrameExtents(window, NULL, &right, NULL, &bottom))
+                    {
+                        switch (index)
+                        {
+                            case wxSYS_BORDER_X:
+                            case wxSYS_EDGE_X:
+                            case wxSYS_FRAMESIZE_X:
+                                return right; // width of right extent
+                            default:
+                                return bottom; // height of bottom extent
+                        }
+                    }
+                }
+            }
+
+            return -1; // no window specified
+
+        case wxSYS_CURSOR_X:
+        case wxSYS_CURSOR_Y:
+                return gdk_display_get_default_cursor_size(
+                            window ? gdk_drawable_get_display(window)
+                                   : gdk_display_get_default());
+
+        case wxSYS_DCLICK_X:
+        case wxSYS_DCLICK_Y:
+            gint dclick_distance;
+            g_object_get(GetSettingsForWindowScreen(window),
+                            "gtk-double-click-distance", &dclick_distance, NULL);
+
+            return dclick_distance * 2;
+
+        case wxSYS_DCLICK_MSEC:
+            gint dclick;
+            g_object_get(GetSettingsForWindowScreen(window),
+                            "gtk-double-click-time", &dclick, NULL);
+            return dclick;
+
+        case wxSYS_DRAG_X:
+        case wxSYS_DRAG_Y:
+            gint drag_threshold;
+            g_object_get(GetSettingsForWindowScreen(window),
+                            "gtk-dnd-drag-threshold", &drag_threshold, NULL);
+
+            // The correct thing here would be to double the value
+            // since that is what the API wants. But the values
+            // are much bigger under GNOME than under Windows and
+            // just seem to much in many cases to be useful.
+            // drag_threshold *= 2;
+
+            return drag_threshold;
+
+        case wxSYS_ICON_X:
+        case wxSYS_ICON_Y:
+            return 32;
+
+        case wxSYS_SCREEN_X:
+            if (window)
+                return gdk_screen_get_width(gdk_drawable_get_screen(window));
+            else
+                return gdk_screen_width();
+
+        case wxSYS_SCREEN_Y:
+            if (window)
+                return gdk_screen_get_height(gdk_drawable_get_screen(window));
+            else
+                return gdk_screen_height();
+
+        case wxSYS_HSCROLL_Y:
+        case wxSYS_VSCROLL_X:
+            return 15;
+
+        case wxSYS_CAPTION_Y:
+            if (!window)
+                // No realized window specified, and no implementation for that case yet.
+                return -1;
+
+            wxASSERT_MSG( wxDynamicCast(win, wxTopLevelWindow),
+                          wxT("Asking for caption height of a non toplevel window") );
+
+            // Get the height of the top windowmanager border.
+            // This is the titlebar in most cases. The titlebar might be elsewhere, and
+            // we could check which is the thickest wm border to decide on which side the
+            // titlebar is, but this might lead to interesting behaviours in used code.
+            // Reconsider when we have a way to report to the user on which side it is.
+            {
+                int top;
+                if (wxGetFrameExtents(window, NULL, NULL, &top, NULL))
+                {
+                    return top; // top frame extent
+                }
+            }
+
+            // Try a default approach without a window pointer, if possible
+            // ...
+
+            return -1;
+
+        case wxSYS_PENWINDOWS_PRESENT:
+            // No MS Windows for Pen computing extension available in X11 based gtk+.
             return 0;
+
+        default:
+            return -1;   // metric is unknown
     }
 }
 
@@ -367,13 +441,13 @@ bool wxSystemSettingsNative::HasFeature(wxSystemFeature index)
 {
     switch (index)
     {
-        case wxSYS_CAN_ICONIZE_FRAME: 
-            return FALSE; 
-            break;
+        case wxSYS_CAN_ICONIZE_FRAME:
+            return false;
+
         case wxSYS_CAN_DRAW_FRAME_DECORATIONS:
-            return TRUE; 
-            break;
+            return true;
+
         default:
-            return FALSE;
+            return false;
     }
 }