File/dir dialog styles and other changes (patch 1488371):

- check invalid combinations of styles in wxFileDialogBase::Create()
- use wxFD_XXX naming convention for wxFileDialog styles
- replaces wxDD_NEW_DIR_BUTTON with wxDD_DIR_MUST_EXIST
- removes #ifdef __WXGTK24__ / #endif blocks from wxGTK code
- removes wxFileDialogBase::Get/SetStyle and wxFileDialogBase::m_fileName
- renames wxDirDialogGTK to wxDirDialog


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39402 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/dirdlgg.cpp

@@ -109,7 +109,7 @@ bool wxGenericDirDialog::Create(wxWindow* parent,
     wxMenu *dirMenu = new wxMenu;
     dirMenu->Append(ID_GO_HOME, _("Home"));
 
-    if (style & wxDD_NEW_DIR_BUTTON)
+    if (!HasFlag(wxDD_DIR_MUST_EXIST))
     {
         dirMenu->Append(ID_NEW, _("New directory"));
     }
@@ -133,7 +133,7 @@ bool wxGenericDirDialog::Create(wxWindow* parent,
 
     // I'm not convinced we need a New button, and we tend to get annoying
     // accidental-editing with label editing enabled.
-    if (style & wxDD_NEW_DIR_BUTTON)
+    if (!HasFlag(wxDD_DIR_MUST_EXIST))
     {
         wxBitmapButton* newButton =
             new wxBitmapButton(this, ID_NEW,
@@ -158,7 +158,7 @@ bool wxGenericDirDialog::Create(wxWindow* parent,
     long dirStyle = wxDIRCTRL_DIR_ONLY | wxDEFAULT_CONTROL_BORDER;
 
 #ifdef __WXMSW__
-    if (style & wxDD_NEW_DIR_BUTTON)
+    if (!HasFlag(wxDD_DIR_MUST_EXIST))
     {
         // Only under Windows do we need the wxTR_EDIT_LABEL tree control style
         // before we can call EditLabel (required for "New directory")