added wxWindow::Freeze/Thaw(), implemented them for wxGTK::wxTextCtrl

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11176 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/textctrl.h

@@ -143,6 +143,11 @@ public:
 
     void SetModified() { m_modified = TRUE; }
 
+    // GTK+ textctrl is so dumb that you need to freeze/thaw it manually to
+    // avoid horrible flicker/scrolling back and forth
+    virtual void Freeze();
+    virtual void Thaw();
+
     // wxGTK-specific: called recursively by Enable,
     // to give widgets an oppprtunity to correct their colours after they
     // have been changed by Enable

include/wx/gtk1/textctrl.h

@@ -143,6 +143,11 @@ public:
 
     void SetModified() { m_modified = TRUE; }
 
+    // GTK+ textctrl is so dumb that you need to freeze/thaw it manually to
+    // avoid horrible flicker/scrolling back and forth
+    virtual void Freeze();
+    virtual void Thaw();
+
     // wxGTK-specific: called recursively by Enable,
     // to give widgets an oppprtunity to correct their colours after they
     // have been changed by Enable

include/wx/window.h

@@ -519,6 +519,12 @@ public:
         // clear the window entirely
     virtual void Clear() = 0;
 
+        // freeze the window: don't redraw it until it is thawed
+    virtual void Freeze() { }
+
+        // thaw the window: redraw it after it had been frozen
+    virtual void Thaw() { }
+
         // adjust DC for drawing on this window
     virtual void PrepareDC( wxDC & WXUNUSED(dc) ) { }