Added wxFilePickerCtrl::SetInitialDirectory().

This method allows to configure the initial directory to be shown when
browsing for files in an initially empty wxFileDirPickerCtrl.

It is also available for wxDirPickerCtrl but is less useful there.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70043 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/filepickerg.h

@@ -58,6 +58,8 @@ public:     // overridable
 
     virtual wxEventType GetEventType() const = 0;
 
+    virtual void SetInitialDirectory(const wxString& dir);
+
 public:
 
     bool Create(wxWindow *parent, wxWindowID id,
@@ -82,6 +84,9 @@ protected:
     // just doesn't make sense to use picker styles for wxButton anyhow
     long m_pickerStyle;
 
+    // Initial directory set by SetInitialDirectory() call or empty.
+    wxString m_initialDir;
+
 private:
     // common part of all ctors
     void Init() { m_pickerStyle = -1; }
@@ -140,16 +145,7 @@ public:     // overridable
         return filedlgstyle;
     }
 
-    virtual wxDialog *CreateDialog()
-    {
-        wxFileDialog *p = new wxFileDialog(GetDialogParent(), m_message,
-                                    wxEmptyString, wxEmptyString,
-                                    m_wildcard, GetDialogStyle());
-
-        // this sets both the default folder and the default file of the dialog
-        p->SetPath(m_path);
-        return p;
-    }
+    virtual wxDialog *CreateDialog();
 
     wxEventType GetEventType() const
         { return wxEVT_COMMAND_FILEPICKER_CHANGED; }
@@ -160,6 +156,10 @@ protected:
     void UpdatePathFromDialog(wxDialog *p)
         { m_path = wxStaticCast(p, wxFileDialog)->GetPath(); }
 
+    // Set the initial directory for the dialog but without overriding the
+    // directory of the currently selected file, if any.
+    void DoSetInitialDirectory(wxFileDialog* dialog, const wxString& dir);
+
 private:
     DECLARE_DYNAMIC_CLASS(wxGenericFileButton)
 };
@@ -204,11 +204,7 @@ public:     // overridable
         return dirdlgstyle;
     }
 
-    virtual wxDialog *CreateDialog()
-    {
-        return new wxDirDialog(GetDialogParent(), m_message, m_path,
-                                   GetDialogStyle());
-    }
+    virtual wxDialog *CreateDialog();
 
     wxEventType GetEventType() const
         { return wxEVT_COMMAND_DIRPICKER_CHANGED; }