From 5a3ef19432acb30174a8b7eb5c8c56e568fb8a3a Mon Sep 17 00:00:00 2001
From: Paul Cornett <paulcor@bullseye.com>
Date: Sat, 9 Dec 2006 06:21:15 +0000
Subject: [PATCH] fix for SetPosition/SetInsertionPoint when called during
 Freeze

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43870 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 include/wx/gtk/textctrl.h | 16 +++++++------
 src/gtk/textctrl.cpp      | 50 ++++++++++++++++++++++++---------------
 2 files changed, 40 insertions(+), 26 deletions(-)

diff --git a/include/wx/gtk/textctrl.h b/include/wx/gtk/textctrl.h
index 1cb6cf64bd..510cdbd91e 100644
--- a/include/wx/gtk/textctrl.h
+++ b/include/wx/gtk/textctrl.h
@@ -8,8 +8,10 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifndef __GTKTEXTCTRLH__
-#define __GTKTEXTCTRLH__
+#ifndef _WX_GTK_TEXTCTRL_H_
+#define _WX_GTK_TEXTCTRL_H_
+
+typedef struct _GtkTextMark GtkTextMark;
 
 //-----------------------------------------------------------------------------
 // wxTextCtrl
@@ -176,7 +178,7 @@ public:
     GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);
 
     // has the control been frozen by Freeze()?
-    bool IsFrozen() const { return m_frozenness > 0; }
+    bool IsFrozen() const { return m_freezeCount > 0; }
 
 protected:
     virtual wxSize DoGetBestSize() const;
@@ -219,11 +221,12 @@ private:
     int         m_countUpdatesToIgnore;
 
     // Our text buffer. Convenient, and holds the buffer while using
-    // a dummy one when m_frozenness > 0
+    // a dummy one when frozen
     GtkTextBuffer *m_buffer;
 
     // number of calls to Freeze() minus number of calls to Thaw()
-    unsigned int m_frozenness;
+    unsigned m_freezeCount;
+    GtkTextMark* m_showPositionOnThaw;
 
     // For wxTE_AUTO_URL
     void OnUrlMouseEvent(wxMouseEvent&);
@@ -234,5 +237,4 @@ private:
     DECLARE_DYNAMIC_CLASS(wxTextCtrl)
 };
 
-#endif // __GTKTEXTCTRLH__
-
+#endif // _WX_GTK_TEXTCTRL_H_
diff --git a/src/gtk/textctrl.cpp b/src/gtk/textctrl.cpp
index 40c89ee562..05256cb4f8 100644
--- a/src/gtk/textctrl.cpp
+++ b/src/gtk/textctrl.cpp
@@ -647,7 +647,8 @@ void wxTextCtrl::Init()
     SetUpdateFont(false);
 
     m_text = NULL;
-    m_frozenness = 0;
+    m_freezeCount = 0;
+    m_showPositionOnThaw = NULL;
     m_gdkHandCursor = NULL;
     m_gdkXTermCursor = NULL;
 }
@@ -702,6 +703,11 @@ bool wxTextCtrl::Create( wxWindow *parent,
 
         m_buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(m_text) );
 
+        // create "ShowPosition" marker
+        GtkTextIter iter;
+        gtk_text_buffer_get_start_iter(m_buffer, &iter);
+        gtk_text_buffer_create_mark(m_buffer, "ShowPosition", &iter, true);
+
         // create scrolled window
         m_widget = gtk_scrolled_window_new( NULL, NULL );
         gtk_scrolled_window_set_policy( GTK_SCROLLED_WINDOW( m_widget ),
@@ -1225,15 +1231,12 @@ void wxTextCtrl::SetInsertionPoint( long pos )
         GtkTextIter iter;
         gtk_text_buffer_get_iter_at_offset( m_buffer, &iter, pos );
         gtk_text_buffer_place_cursor( m_buffer, &iter );
-        if (!IsFrozen())
-        {
-            // won't work when frozen, text view is not using m_buffer then
-            gtk_text_view_scroll_mark_onscreen
-            (
-                GTK_TEXT_VIEW(m_text),
-                gtk_text_buffer_get_insert( m_buffer )
-            );
-        }
+        GtkTextMark* mark = gtk_text_buffer_get_insert(m_buffer);
+        if (IsFrozen())
+            // defer until Thaw, text view is not using m_buffer now
+            m_showPositionOnThaw = mark;
+        else
+            gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(m_text), mark);
     }
     else
     {
@@ -1405,14 +1408,17 @@ void wxTextCtrl::SetSelection( long from, long to )
 
 void wxTextCtrl::ShowPosition( long pos )
 {
-    // won't work when frozen, text view is not using m_buffer then
-    if (IsMultiLine() && !IsFrozen())
+    if (IsMultiLine())
     {
         GtkTextIter iter;
-        gtk_text_buffer_get_start_iter( m_buffer, &iter );
-        gtk_text_iter_set_offset( &iter, pos );
-        GtkTextMark *mark = gtk_text_buffer_create_mark( m_buffer, NULL, &iter, TRUE );
-        gtk_text_view_scroll_to_mark( GTK_TEXT_VIEW(m_text), mark, 0.0, FALSE, 0.0, 0.0 );
+        gtk_text_buffer_get_iter_at_offset(m_buffer, &iter, int(pos));
+        GtkTextMark* mark = gtk_text_buffer_get_mark(m_buffer, "ShowPosition");
+        gtk_text_buffer_move_mark(m_buffer, mark, &iter);
+        if (IsFrozen())
+            // defer until Thaw, text view is not using m_buffer now
+            m_showPositionOnThaw = mark;
+        else
+            gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(m_text), mark);
     }
 }
 
@@ -1879,7 +1885,7 @@ void wxTextCtrl::Freeze()
 
     if ( HasFlag(wxTE_MULTILINE) )
     {
-        if (m_frozenness++ == 0)
+        if (m_freezeCount++ == 0)
         {
             // freeze textview updates and remove buffer
             g_signal_connect (m_text, "expose_event",
@@ -1907,9 +1913,9 @@ void wxTextCtrl::Thaw()
 {
     if ( HasFlag(wxTE_MULTILINE) )
     {
-        wxCHECK_RET(m_frozenness != 0, _T("Thaw() without matching Freeze()"));
+        wxCHECK_RET(m_freezeCount != 0, _T("Thaw() without matching Freeze()"));
 
-        if (--m_frozenness == 0)
+        if (--m_freezeCount == 0)
         {
             // Reattach buffer and thaw textview updates
             gtk_text_view_set_buffer(GTK_TEXT_VIEW(m_text), m_buffer);
@@ -1919,6 +1925,12 @@ void wxTextCtrl::Thaw()
                     (gpointer) gtk_text_exposed_callback, this);
             g_signal_handlers_disconnect_by_func (m_text,
                     (gpointer) gtk_text_exposed_callback, this);
+            if (m_showPositionOnThaw != NULL)
+            {
+                gtk_text_view_scroll_mark_onscreen(
+                    GTK_TEXT_VIEW(m_text), m_showPositionOnThaw);
+                m_showPositionOnThaw = NULL;
+            }
         }
     }
 }
-- 
2.45.2