Added native wxInfoBar implementation for wxGTK.

Straightforward implementation of wxInfoBar using GtkInfoBar widget available
in GTK+ 2.18.

Some side effects of this change:

- Rename wxInfoBar version in wx/generic/infobar.h to wxInfoBarGeneric and
  define wxInfoBar in wx/infobar.h.
- Also change default value of flags argument to ShowMessage() to
  wxICON_INFORMATION from wxICON_NONE as the default colour for wxICON_NONE
  messages is surprisingly ugly in GTK native version.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62276 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/infobar.cpp

@@ -0,0 +1,150 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        src/gtk/infobar.cpp
+// Purpose:     wxInfoBar implementation for GTK
+// Author:      Vadim Zeitlin
+// Created:     2009-09-27
+// RCS-ID:      $Id: wxhead.cpp,v 1.10 2009-06-29 10:23:04 zeitlin Exp $
+// Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// for compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#include "wx/infobar.h"
+
+#if wxUSE_INFOBAR && defined(wxHAS_NATIVE_INFOBAR)
+
+#ifndef WX_PRECOMP
+#endif // WX_PRECOMP
+
+#include "wx/gtk/private.h"
+#include "wx/gtk/private/messagetype.h"
+
+// ----------------------------------------------------------------------------
+// local functions
+// ----------------------------------------------------------------------------
+
+namespace
+{
+
+inline bool UseNative()
+{
+    // native GtkInfoBar widget is only available in GTK+ 2.18 and later
+    return gtk_check_version(2, 18, 0) == 0;
+}
+
+} // anonymous namespace
+
+extern "C"
+{
+
+static void wxgtk_infobar_response(GtkInfoBar * WXUNUSED(infobar),
+                                   gint btnid,
+                                   wxInfoBar *win)
+{
+    win->GTKResponse(btnid);
+}
+
+static void wxgtk_infobar_close(GtkInfoBar * WXUNUSED(infobar),
+                                wxInfoBar *win)
+{
+    win->GTKResponse(wxID_CANCEL);
+}
+
+} // extern "C" section with GTK+ callbacks
+
+// ============================================================================
+// wxInfoBar implementation
+// ============================================================================
+
+bool wxInfoBar::Create(wxWindow *parent, wxWindowID winid)
+{
+    if ( !UseNative() )
+        return wxInfoBarGeneric::Create(parent, winid);
+
+    // this control is created initially hidden
+    Hide();
+    if ( !CreateBase(parent, winid) )
+        return false;
+
+    // create the info bar widget itself
+    m_widget = gtk_info_bar_new();
+    wxCHECK_MSG( m_widget, false, "failed to create GtkInfoBar" );
+    g_object_ref(m_widget);
+
+    // also create a label which will be used to show our message
+    m_label = gtk_label_new("");
+    gtk_widget_show(m_label);
+
+    GtkWidget * const
+        contentArea = gtk_info_bar_get_content_area(GTK_INFO_BAR(m_widget));
+    wxCHECK_MSG( contentArea, false, "failed to get GtkInfoBar content area" );
+    gtk_container_add(GTK_CONTAINER(contentArea), m_label);
+
+    // finish creation and connect to all the signals we're interested in
+    m_parent->DoAddChild(this);
+
+    PostCreation(wxDefaultSize);
+
+    GTKConnectWidget("response", G_CALLBACK(wxgtk_infobar_response));
+    GTKConnectWidget("close", G_CALLBACK(wxgtk_infobar_close));
+
+    return false;
+}
+
+void wxInfoBar::ShowMessage(const wxString& msg, int flags)
+{
+    if ( !UseNative() )
+    {
+        wxInfoBarGeneric::ShowMessage(msg, flags);
+        return;
+    }
+
+    GtkMessageType type;
+    if ( wxGTKImpl::ConvertMessageTypeFromWX(flags, &type) )
+        gtk_info_bar_set_message_type(GTK_INFO_BAR(m_widget), type);
+    gtk_label_set_text(GTK_LABEL(m_label), wxGTK_CONV(msg));
+
+    if ( !IsShown() )
+        Show();
+
+    UpdateParent();
+}
+
+void wxInfoBar::GTKResponse(int WXUNUSED(btnid))
+{
+    Hide();
+
+    UpdateParent();
+}
+
+void wxInfoBar::AddButton(wxWindowID btnid, const wxString& label)
+{
+    if ( !UseNative() )
+    {
+        wxInfoBarGeneric::AddButton(btnid, label);
+        return;
+    }
+
+    gtk_info_bar_add_button
+    (
+        GTK_INFO_BAR(m_widget),
+        label.empty() ? GTKConvertMnemonics(wxGetStockGtkID(btnid)) : label,
+        btnid
+    );
+}
+
+#endif // wxUSE_INFOBAR