From 71aba8333cc915afff9e740c944f7fa7247abacb Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Thu, 18 Sep 2003 23:48:22 +0000
Subject: [PATCH] fix text scrolling in GTK2 (patch 703988)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23697 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/changes.txt      |  8 ++++++--
 src/gtk/textctrl.cpp  | 22 ++++++++++++++++------
 src/gtk1/textctrl.cpp | 22 ++++++++++++++++------
 3 files changed, 38 insertions(+), 14 deletions(-)

diff --git a/docs/changes.txt b/docs/changes.txt
index 837f6e31a3..3d4c73fac8 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -47,13 +47,17 @@ Base:
 
 - wxDateTime::ParseDateTime() implemented (Linus McCabe)
 
+All (GUI):
+
+- added wxListCtrl::GetViewRect()
+
 wxMSW:
 
 - fixed wxTE_*WRAP styles handling
 
-All (GUI):
+wxGTK:
 
-- added wxListCtrl::GetViewRect()
+- fixes to wxTextCtrl scrolling under GTK2 (Nerijus Baliunas)
 
 
 2.5.0
diff --git a/src/gtk/textctrl.cpp b/src/gtk/textctrl.cpp
index 7ae4bda8cb..fda2c96595 100644
--- a/src/gtk/textctrl.cpp
+++ b/src/gtk/textctrl.cpp
@@ -587,10 +587,13 @@ void wxTextCtrl::WriteText( const wxString &text )
         // TODO: Call whatever is needed to delete the selection.
         wxGtkTextInsert( m_text, text_buffer, m_defaultStyle, buffer );
 
-        // Scroll to cursor.
-        GtkTextIter iter;
-        gtk_text_buffer_get_iter_at_mark( text_buffer, &iter,  gtk_text_buffer_get_insert( text_buffer ) );
-        gtk_text_view_scroll_to_iter( GTK_TEXT_VIEW(m_text), &iter, 0.0, FALSE, 0.0, 1.0 );
+        GtkAdjustment *adj = gtk_scrolled_window_get_vadjustment( GTK_SCROLLED_WINDOW(m_widget) );
+        // Scroll to cursor, but only if scrollbar thumb is at the very bottom
+        if ( adj->value == adj->upper - adj->page_size )
+        {
+            gtk_text_view_scroll_to_mark( GTK_TEXT_VIEW(m_text),
+                    gtk_text_buffer_get_insert( text_buffer ), 0.0, FALSE, 0.0, 1.0 );
+        }
 #else // GTK 1.x
         // After cursor movements, gtk_text_get_point() is wrong by one.
         gtk_text_set_point( GTK_TEXT(m_text), GET_EDITABLE_POS(m_text) );
@@ -1005,9 +1008,16 @@ void wxTextCtrl::SetSelection( long from, long to )
 
 void wxTextCtrl::ShowPosition( long pos )
 {
-#ifndef __WXGTK20__
     if (m_windowStyle & wxTE_MULTILINE)
     {
+#ifdef __WXGTK20__
+        GtkTextBuffer *buf = gtk_text_view_get_buffer( GTK_TEXT_VIEW(m_text) );
+        GtkTextIter iter;
+        gtk_text_buffer_get_start_iter( buf, &iter );
+        gtk_text_iter_set_offset( &iter, pos );
+        GtkTextMark *mark = gtk_text_buffer_create_mark( buf, NULL, &iter, TRUE );
+        gtk_text_view_scroll_to_mark( GTK_TEXT_VIEW(m_text), mark, 0.0, FALSE, 0.0, 0.0 );
+#else // GTK 1.x
         GtkAdjustment *vp = GTK_TEXT(m_text)->vadj;
         float totalLines =  (float) GetNumberOfLines();
         long posX;
@@ -1016,8 +1026,8 @@ void wxTextCtrl::ShowPosition( long pos )
         float posLine = (float) posY;
         float p = (posLine/totalLines)*(vp->upper - vp->lower) + vp->lower;
         gtk_adjustment_set_value(GTK_TEXT(m_text)->vadj, p);
+#endif // GTK 1.x/2.x
     }
-#endif
 }
 
 long wxTextCtrl::GetInsertionPoint() const
diff --git a/src/gtk1/textctrl.cpp b/src/gtk1/textctrl.cpp
index 7ae4bda8cb..fda2c96595 100644
--- a/src/gtk1/textctrl.cpp
+++ b/src/gtk1/textctrl.cpp
@@ -587,10 +587,13 @@ void wxTextCtrl::WriteText( const wxString &text )
         // TODO: Call whatever is needed to delete the selection.
         wxGtkTextInsert( m_text, text_buffer, m_defaultStyle, buffer );
 
-        // Scroll to cursor.
-        GtkTextIter iter;
-        gtk_text_buffer_get_iter_at_mark( text_buffer, &iter,  gtk_text_buffer_get_insert( text_buffer ) );
-        gtk_text_view_scroll_to_iter( GTK_TEXT_VIEW(m_text), &iter, 0.0, FALSE, 0.0, 1.0 );
+        GtkAdjustment *adj = gtk_scrolled_window_get_vadjustment( GTK_SCROLLED_WINDOW(m_widget) );
+        // Scroll to cursor, but only if scrollbar thumb is at the very bottom
+        if ( adj->value == adj->upper - adj->page_size )
+        {
+            gtk_text_view_scroll_to_mark( GTK_TEXT_VIEW(m_text),
+                    gtk_text_buffer_get_insert( text_buffer ), 0.0, FALSE, 0.0, 1.0 );
+        }
 #else // GTK 1.x
         // After cursor movements, gtk_text_get_point() is wrong by one.
         gtk_text_set_point( GTK_TEXT(m_text), GET_EDITABLE_POS(m_text) );
@@ -1005,9 +1008,16 @@ void wxTextCtrl::SetSelection( long from, long to )
 
 void wxTextCtrl::ShowPosition( long pos )
 {
-#ifndef __WXGTK20__
     if (m_windowStyle & wxTE_MULTILINE)
     {
+#ifdef __WXGTK20__
+        GtkTextBuffer *buf = gtk_text_view_get_buffer( GTK_TEXT_VIEW(m_text) );
+        GtkTextIter iter;
+        gtk_text_buffer_get_start_iter( buf, &iter );
+        gtk_text_iter_set_offset( &iter, pos );
+        GtkTextMark *mark = gtk_text_buffer_create_mark( buf, NULL, &iter, TRUE );
+        gtk_text_view_scroll_to_mark( GTK_TEXT_VIEW(m_text), mark, 0.0, FALSE, 0.0, 0.0 );
+#else // GTK 1.x
         GtkAdjustment *vp = GTK_TEXT(m_text)->vadj;
         float totalLines =  (float) GetNumberOfLines();
         long posX;
@@ -1016,8 +1026,8 @@ void wxTextCtrl::ShowPosition( long pos )
         float posLine = (float) posY;
         float p = (posLine/totalLines)*(vp->upper - vp->lower) + vp->lower;
         gtk_adjustment_set_value(GTK_TEXT(m_text)->vadj, p);
+#endif // GTK 1.x/2.x
     }
-#endif
 }
 
 long wxTextCtrl::GetInsertionPoint() const
-- 
2.45.2