Applied modified form of the StdButtonSize patch.

Tested on GTK2, MSW and Mac.
  Adapted various generic dialogs to stretch the
    button sizer so that the buttons don't end
    up centered but right aligned.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31198 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/sizer.h

@@ -18,6 +18,7 @@
 
 #include "wx/defs.h"
 
+#include "wx/button.h"
 #include "wx/window.h"
 #include "wx/frame.h"
 #include "wx/dialog.h"
@@ -641,6 +642,48 @@ private:
 
 #endif // wxUSE_STATBOX
 
+class WXDLLEXPORT wxStdDialogButtonSizer: public wxBoxSizer
+{
+public:
+    wxStdDialogButtonSizer();
+    // Constructor just creates a new wxBoxSizer, not much else.
+    // Box sizer orientation is automatically determined here:
+    // vertical for PDAs, horizontal for everything else?
+
+    void AddButton(wxButton *button);
+    // Checks button ID against system IDs and sets one of the pointers below
+    // to this button.
+    // Does not do any sizer-related things here.
+
+    // Question: what to do for non-supported button IDs? assert?
+
+    void Finalise();
+    // All platform-specific code here, checks which buttons exist and add
+    // them to the sizer accordingly.
+    // Note - one potential hack on Mac we could use here,
+    // if m_buttonAffirmative is wxID_SAVE then ensure wxID_SAVE
+    // is set to _("Save") and m_buttonNegative is set to _("Don't Save")
+    // I wouldn't add any other hacks like that into here,
+    // but this one I can see being useful.
+    
+    wxButton *GetAffirmativeButton() const { return m_buttonAffirmative; }
+    wxButton *GetApplyButton() const { return m_buttonApply; }
+    wxButton *GetNegativeButton() const { return m_buttonNegative; }
+    wxButton *GetCancelButton() const { return m_buttonCancel; }
+    wxButton *GetHelpButton() const { return m_buttonHelp; }
+
+protected:
+    wxButton *m_buttonAffirmative;
+    // wxID_OK, wxID_YES, wxID_SAVE go here
+    wxButton *m_buttonApply;
+    wxButton *m_buttonNegative; // wxID_NO
+    wxButton *m_buttonCancel;
+    wxButton *m_buttonHelp;
+    
+private:
+    DECLARE_CLASS(wxStdDialogButtonSizer)
+    //DECLARE_NO_COPY_CLASS(wxStdDialogButtonSizer)
+};
 
 #if WXWIN_COMPATIBILITY_2_4
 // NB: wxBookCtrlSizer and wxNotebookSizer are deprecated, they