X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fdca68a6708f970cdff275d1dafc1622e23dc4f8..d53fc7c96d38775025b0714ddb6e98bd1cd6f111:/src/gtk/textctrl.cpp

diff --git a/src/gtk/textctrl.cpp b/src/gtk/textctrl.cpp
index fb8a8e6fce..6c37c6636a 100644
--- a/src/gtk/textctrl.cpp
+++ b/src/gtk/textctrl.cpp
@@ -21,6 +21,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <ctype.h>
+#include <math.h>               // for fabs
 
 #include "gdk/gdk.h"
 #include "gtk/gtk.h"
@@ -40,150 +41,105 @@ extern bool g_isIdle;
 extern bool       g_blockEventsOnDrag;
 extern wxCursor   g_globalCursor;
 
-//-----------------------------------------------------------------------------
-//  "changed"
-//-----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+// helpers
+// ----------------------------------------------------------------------------
 
-static void
-gtk_text_changed_callback( GtkWidget *WXUNUSED(widget), wxTextCtrl *win )
+static void wxGtkTextInsert(GtkWidget *text,
+                            const wxTextAttr& attr,
+                            const char *txt,
+                            size_t len)
 {
-    if (!win->m_hasVMT) return;
+    GdkFont *font = attr.HasFont() ? attr.GetFont().GetInternalFont()
+                                   : NULL;
 
-    if (g_isIdle)
-        wxapp_install_idle_handler();
+    GdkColor *colFg = attr.HasTextColour() ? attr.GetTextColour().GetColor()
+                                           : NULL;
 
-    win->SetModified();
-    win->UpdateFontIfNeeded();
+    GdkColor *colBg = attr.HasBackgroundColour()
+                        ? attr.GetBackgroundColour().GetColor()
+                        : NULL;
 
-    wxCommandEvent event( wxEVT_COMMAND_TEXT_UPDATED, win->GetId() );
-    event.SetString( win->GetValue() );
-    event.SetEventObject( win );
-    win->GetEventHandler()->ProcessEvent( event );
+    gtk_text_insert( GTK_TEXT(text), font, colFg, colBg, txt, len );
 }
 
-//-----------------------------------------------------------------------------
-// "changed" from vertical scrollbar
-//-----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+// "insert_text" for GtkEntry
+// ----------------------------------------------------------------------------
 
 static void
-gtk_scrollbar_changed_callback( GtkWidget *WXUNUSED(widget), wxTextCtrl *win )
+gtk_insert_text_callback(GtkEditable *editable,
+                         const gchar *new_text,
+                         gint new_text_length,
+                         gint *position,
+                         wxTextCtrl *win)
 {
-    if (!win->m_hasVMT) return;
-
     if (g_isIdle)
         wxapp_install_idle_handler();
 
-    win->CalculateScrollbar();
+    // we should only be called if we have a max len limit at all
+    GtkEntry *entry = GTK_ENTRY (editable);
+
+    wxCHECK_RET( entry->text_max_length, _T("shouldn't be called") );
+
+    // check that we don't overflow the max length limit
+    //
+    // FIXME: this doesn't work when we paste a string which is going to be
+    //        truncated
+    if ( entry->text_length == entry->text_max_length )
+    {
+        // we don't need to run the base class version at all
+        gtk_signal_emit_stop_by_name(GTK_OBJECT(editable), "insert_text");
+
+        // remember that the next changed signal is to be ignored to avoid
+        // generating a dummy wxEVT_COMMAND_TEXT_UPDATED event
+        win->IgnoreNextTextUpdate();
+
+        // and generate the correct one ourselves
+        wxCommandEvent event(wxEVT_COMMAND_TEXT_MAXLEN, win->GetId());
+        event.SetEventObject(win);
+        event.SetString(win->GetValue());
+        win->GetEventHandler()->ProcessEvent( event );
+    }
 }
 
 //-----------------------------------------------------------------------------
-// "focus_in_event"
+//  "changed"
 //-----------------------------------------------------------------------------
 
-wxWindow *FindFocusedChild(wxWindow *win);
-extern wxWindow  *g_focusWindow;
-extern bool       g_blockEventsOnDrag;
-// extern bool g_isIdle;
-
-static gint gtk_text_focus_in_callback( GtkWidget *widget, GdkEvent *WXUNUSED(event), wxWindow *win )
+static void
+gtk_text_changed_callback( GtkWidget *widget, wxTextCtrl *win )
 {
-    // Necessary?
-#if 0
-    if (g_isIdle)
-        wxapp_install_idle_handler();
-#endif
-    if (!win->m_hasVMT) return FALSE;
-    if (g_blockEventsOnDrag) return FALSE;
-
-    g_focusWindow = win;
+    if ( win->IgnoreTextUpdate() )
+        return;
 
-    wxPanel *panel = wxDynamicCast(win->GetParent(), wxPanel);
-    if (panel)
-    {
-        panel->SetLastFocus(win);
-    }
+    if (!win->m_hasVMT) return;
 
-#ifdef HAVE_XIM
-    if (win->m_ic)
-        gdk_im_begin(win->m_ic, win->m_wxwindow->window);
-#endif
+    if (g_isIdle)
+        wxapp_install_idle_handler();
 
-#if 0
-#ifdef wxUSE_CARET
-    // caret needs to be informed about focus change
-    wxCaret *caret = win->GetCaret();
-    if ( caret )
-    {
-        caret->OnSetFocus();
-    }
-#endif // wxUSE_CARET
-#endif
+    win->SetModified();
+    win->UpdateFontIfNeeded();
 
-    wxFocusEvent event( wxEVT_SET_FOCUS, win->GetId() );
+    wxCommandEvent event( wxEVT_COMMAND_TEXT_UPDATED, win->GetId() );
     event.SetEventObject( win );
-
-    if (win->GetEventHandler()->ProcessEvent( event ))
-    {
-        gtk_signal_emit_stop_by_name( GTK_OBJECT(widget), "focus_in_event" );
-        return TRUE;
-    }
-
-    return FALSE;
+    event.SetString( win->GetValue() );
+    win->GetEventHandler()->ProcessEvent( event );
 }
 
 //-----------------------------------------------------------------------------
-// "focus_out_event"
+// "changed" from vertical scrollbar
 //-----------------------------------------------------------------------------
 
-static gint gtk_text_focus_out_callback( GtkWidget *widget, GdkEvent *WXUNUSED(event), wxWindow *win )
+static void
+gtk_scrollbar_changed_callback( GtkWidget *WXUNUSED(widget), wxTextCtrl *win )
 {
-#if 0
+    if (!win->m_hasVMT) return;
+
     if (g_isIdle)
         wxapp_install_idle_handler();
-#endif
-
-    if (!win->m_hasVMT) return FALSE;
-    if (g_blockEventsOnDrag) return FALSE;
-
-#if 0
-    // if the focus goes out of our app alltogether, OnIdle() will send
-    // wxActivateEvent, otherwise gtk_window_focus_in_callback() will reset
-    // g_sendActivateEvent to -1
-    g_sendActivateEvent = 0;
-#endif
 
-    wxWindow *winFocus = FindFocusedChild(win);
-    if ( winFocus )
-        win = winFocus;
-
-    g_focusWindow = (wxWindow *)NULL;
-
-#ifdef HAVE_XIM
-    if (win->m_ic)
-        gdk_im_end();
-#endif
-
-#if 0
-#ifdef wxUSE_CARET
-    // caret needs to be informed about focus change
-    wxCaret *caret = win->GetCaret();
-    if ( caret )
-    {
-        caret->OnKillFocus();
-    }
-#endif // wxUSE_CARET
-#endif
-
-    wxFocusEvent event( wxEVT_KILL_FOCUS, win->GetId() );
-    event.SetEventObject( win );
-
-    if (win->GetEventHandler()->ProcessEvent( event ))
-    {
-        gtk_signal_emit_stop_by_name( GTK_OBJECT(widget), "focus_out_event" );
-        return TRUE;
-    }
-
-    return FALSE;
+    win->CalculateScrollbar();
 }
 
 //-----------------------------------------------------------------------------
@@ -210,6 +166,7 @@ END_EVENT_TABLE()
 
 void wxTextCtrl::Init()
 {
+    m_ignoreNextUpdate =
     m_modified = FALSE;
     m_updateFont = FALSE;
     m_text =
@@ -311,6 +268,8 @@ bool wxTextCtrl::Create( wxWindow *parent,
 
     m_parent->DoAddChild( this );
 
+    m_focusWidget = m_text;
+
     PostCreation();
 
     SetFont( parent->GetFont() );
@@ -331,20 +290,6 @@ bool wxTextCtrl::Create( wxWindow *parent,
     {
         gtk_signal_connect(GTK_OBJECT(GTK_TEXT(m_text)->vadj), "changed",
           (GtkSignalFunc) gtk_scrollbar_changed_callback, (gpointer) this );
-
-        gtk_signal_connect( GTK_OBJECT(GTK_TEXT(m_text)), "focus_in_event",
-              GTK_SIGNAL_FUNC(gtk_text_focus_in_callback), (gpointer)this );
-
-        gtk_signal_connect( GTK_OBJECT(GTK_TEXT(m_text)), "focus_out_event",
-			    GTK_SIGNAL_FUNC(gtk_text_focus_out_callback), (gpointer)this );
-    }
-    else
-    {
-        gtk_signal_connect( GTK_OBJECT(m_text), "focus_in_event",
-              GTK_SIGNAL_FUNC(gtk_text_focus_in_callback), (gpointer)this );
-
-        gtk_signal_connect( GTK_OBJECT(m_text), "focus_out_event",
-			    GTK_SIGNAL_FUNC(gtk_text_focus_out_callback), (gpointer)this );
     }
 
     if (!value.IsEmpty())
@@ -396,10 +341,15 @@ bool wxTextCtrl::Create( wxWindow *parent,
     /* we don't set a valid background colour, because the window
        manager should use a default one */
     m_backgroundColour = wxColour();
-    SetForegroundColour( parent->GetForegroundColour() );
+
+    wxColour colFg = parent->GetForegroundColour();
+    SetForegroundColour( colFg );
 
     m_cursor = wxCursor( wxCURSOR_IBEAM );
 
+    wxTextAttr attrDef( colFg, m_backgroundColour, parent->GetFont() );
+    SetDefaultStyle( attrDef );
+
     Show( TRUE );
 
     return TRUE;
@@ -481,114 +431,94 @@ void wxTextCtrl::WriteText( const wxString &text )
 {
     wxCHECK_RET( m_text != NULL, wxT("invalid text ctrl") );
 
-    if (text.IsEmpty()) return;
-
-    if (m_windowStyle & wxTE_MULTILINE)
-    {
-        /* this moves the cursor pos to behind the inserted text */
-        gint len = GTK_EDITABLE(m_text)->current_pos;
+    if ( text.empty() )
+        return;
 
 #if wxUSE_UNICODE
-        wxWX2MBbuf buf = text.mbc_str();
-        gtk_editable_insert_text( GTK_EDITABLE(m_text), buf, strlen(buf), &len );
+    wxWX2MBbuf buf = text.mbc_str();
+    const char *txt = buf;
+    size_t txtlen = strlen(buf);
 #else
-        gtk_editable_insert_text( GTK_EDITABLE(m_text), text, text.Length(), &len );
+    const char *txt = text;
+    size_t txtlen = text.length();
 #endif
 
-        /* bring editable's cursor uptodate. bug in GTK. */
+    if ( m_windowStyle & wxTE_MULTILINE )
+    {
+        // After cursor movements, gtk_text_get_point() is wrong by one.
+        gtk_text_set_point( GTK_TEXT(m_text), GTK_EDITABLE(m_text)->current_pos );
+
+        // if we have any special style, use it
+        if ( !m_defaultStyle.IsDefault() )
+        {
+            GetInsertionPoint();
+
+            wxGtkTextInsert(m_text, m_defaultStyle, txt, txtlen);
+        }
+        else // no style
+        {
+            gint len = GTK_EDITABLE(m_text)->current_pos;
+            gtk_editable_insert_text( GTK_EDITABLE(m_text), txt, txtlen, &len );
+        }
+
+        // Bring editable's cursor back uptodate.
         GTK_EDITABLE(m_text)->current_pos = gtk_text_get_point( GTK_TEXT(m_text) );
     }
-    else
+    else // single line
     {
-        /* this moves the cursor pos to behind the inserted text */
+        // This moves the cursor pos to behind the inserted text.
         gint len = GTK_EDITABLE(m_text)->current_pos;
-#if wxUSE_UNICODE
-        wxWX2MBbuf buf = text.mbc_str();
-        gtk_editable_insert_text( GTK_EDITABLE(m_text), buf, strlen(buf), &len );
-#else
-        gtk_editable_insert_text( GTK_EDITABLE(m_text), text, text.Length(), &len );
-#endif
+        gtk_editable_insert_text( GTK_EDITABLE(m_text), txt, txtlen, &len );
 
-        /* bring editable's cursor uptodate. bug in GTK. */
+        // Bring editable's cursor uptodate.
         GTK_EDITABLE(m_text)->current_pos += text.Len();
 
-        /* bring entry's cursor uptodate. bug in GTK. */
+        // Bring entry's cursor uptodate.
         gtk_entry_set_position( GTK_ENTRY(m_text), GTK_EDITABLE(m_text)->current_pos );
     }
+
+    m_modified = TRUE;
 }
 
 void wxTextCtrl::AppendText( const wxString &text )
 {
-    wxCHECK_RET( m_text != NULL, wxT("invalid text ctrl") );
-
-    if (text.IsEmpty()) return;
+    SetInsertionPointEnd();
+    WriteText( text );
+}
 
+wxString wxTextCtrl::GetLineText( long lineNo ) const
+{
     if (m_windowStyle & wxTE_MULTILINE)
     {
-        bool hasSpecialAttributes = m_font.Ok() ||
-    	                            m_foregroundColour.Ok();
-        if ( hasSpecialAttributes )
+        gint len = gtk_text_get_length( GTK_TEXT(m_text) );
+        char *text = gtk_editable_get_chars( GTK_EDITABLE(m_text), 0, len );
+
+        if (text)
         {
-             gtk_text_insert( GTK_TEXT(m_text),
-                              m_font.GetInternalFont(),
-                              m_foregroundColour.GetColor(),
-                              m_backgroundColour.Ok() ?
-			         m_backgroundColour.GetColor(): NULL,
-                              text.mbc_str(), text.length());
+            wxString buf(wxT(""));
+            long i;
+            int currentLine = 0;
+            for (i = 0; currentLine != lineNo && text[i]; i++ )
+                if (text[i] == '\n')
+            currentLine++;
+            // Now get the text
+            int j;
+            for (j = 0; text[i] && text[i] != '\n'; i++, j++ )
+                buf += text[i];
 
+            g_free( text );
+            return buf;
         }
         else
         {
-            /* we'll insert at the last position */
-            gint len = gtk_text_get_length( GTK_TEXT(m_text) );
-#if wxUSE_UNICODE
-            wxWX2MBbuf buf = text.mbc_str();
-            gtk_editable_insert_text( GTK_EDITABLE(m_text), buf, strlen(buf), &len );
-#else
-            gtk_editable_insert_text( GTK_EDITABLE(m_text), text, text.Length(), &len );
-#endif
+            return wxEmptyString;
         }
-
-        /* bring editable's cursor uptodate. bug in GTK. */
-        GTK_EDITABLE(m_text)->current_pos = gtk_text_get_point( GTK_TEXT(m_text) );
     }
     else
     {
-        gtk_entry_append_text( GTK_ENTRY(m_text), text.mbc_str() );
-    }
-}
-
-wxString wxTextCtrl::GetLineText( long lineNo ) const
-{
-  if (m_windowStyle & wxTE_MULTILINE)
-  {
-    gint len = gtk_text_get_length( GTK_TEXT(m_text) );
-    char *text = gtk_editable_get_chars( GTK_EDITABLE(m_text), 0, len );
-
-    if (text)
-    {
-        wxString buf(wxT(""));
-        long i;
-        int currentLine = 0;
-        for (i = 0; currentLine != lineNo && text[i]; i++ )
-          if (text[i] == '\n')
-            currentLine++;
-        // Now get the text
-        int j;
-        for (j = 0; text[i] && text[i] != '\n'; i++, j++ )
-            buf += text[i];
-
-        g_free( text );
-        return buf;
+        if (lineNo == 0) return GetValue();
+        return wxEmptyString;
     }
-    else
-      return wxEmptyString;
-  }
-  else
-  {
-    if (lineNo == 0) return GetValue();
-    return wxEmptyString;
-  }
 }
 
 void wxTextCtrl::OnDropFiles( wxDropFilesEvent &WXUNUSED(event) )
@@ -756,7 +686,7 @@ bool wxTextCtrl::Enable( bool enable )
     if (m_windowStyle & wxTE_MULTILINE)
     {
         gtk_text_set_editable( GTK_TEXT(m_text), enable );
-
+        OnParentEnable(enable);
     }
     else
     {
@@ -791,6 +721,61 @@ void wxTextCtrl::DiscardEdits()
     m_modified = FALSE;
 }
 
+// ----------------------------------------------------------------------------
+// max text length support
+// ----------------------------------------------------------------------------
+
+void wxTextCtrl::IgnoreNextTextUpdate()
+{
+    m_ignoreNextUpdate = TRUE;
+}
+
+bool wxTextCtrl::IgnoreTextUpdate()
+{
+    if ( m_ignoreNextUpdate )
+    {
+        m_ignoreNextUpdate = FALSE;
+
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+void wxTextCtrl::SetMaxLength(unsigned long len)
+{
+    if ( !HasFlag(wxTE_MULTILINE) )
+    {
+        gtk_entry_set_max_length(GTK_ENTRY(m_text), len);
+
+        // there is a bug in GTK+ 1.2.x: "changed" signal is emitted even if
+        // we had tried to enter more text than allowed by max text length and
+        // the text wasn't really changed
+        //
+        // to detect this and generate TEXT_MAXLEN event instead of
+        // TEXT_CHANGED one in this case we also catch "insert_text" signal
+        //
+        // when max len is set to 0 we disconnect our handler as it means that
+        // we shouldn't check anything any more
+        if ( len )
+        {
+            gtk_signal_connect( GTK_OBJECT(m_text),
+                                "insert_text",
+                                GTK_SIGNAL_FUNC(gtk_insert_text_callback),
+                                (gpointer)this);
+        }
+        else // no checking
+        {
+            gtk_signal_disconnect_by_func
+            (
+                GTK_OBJECT(m_text),
+                GTK_SIGNAL_FUNC(gtk_insert_text_callback),
+                (gpointer)this
+            );
+        }
+    }
+}
+
 void wxTextCtrl::SetSelection( long from, long to )
 {
     wxCHECK_RET( m_text != NULL, wxT("invalid text ctrl") );
@@ -889,27 +874,6 @@ void wxTextCtrl::Paste()
 #endif
 }
 
-bool wxTextCtrl::CanCopy() const
-{
-    // Can copy if there's a selection
-    long from, to;
-    GetSelection(& from, & to);
-    return (from != to) ;
-}
-
-bool wxTextCtrl::CanCut() const
-{
-    // Can cut if there's a selection
-    long from, to;
-    GetSelection(& from, & to);
-    return (from != to) && (IsEditable());
-}
-
-bool wxTextCtrl::CanPaste() const
-{
-    return IsEditable() ;
-}
-
 // Undo/redo
 void wxTextCtrl::Undo()
 {
@@ -1043,6 +1007,8 @@ bool wxTextCtrl::SetFont( const wxFont &font )
     {
         m_updateFont = TRUE;
 
+        m_defaultStyle.SetFont(font);
+
         ChangeFontGlobally();
     }
 
@@ -1059,10 +1025,10 @@ void wxTextCtrl::ChangeFontGlobally()
     wxString value = GetValue();
     if ( !value.IsEmpty() )
     {
+        m_updateFont = FALSE;
+
         Clear();
         AppendText(value);
-
-        m_updateFont = FALSE;
     }
 }
 
@@ -1072,24 +1038,28 @@ void wxTextCtrl::UpdateFontIfNeeded()
         ChangeFontGlobally();
 }
 
-bool wxTextCtrl::SetForegroundColour( const wxColour &WXUNUSED(colour) )
+bool wxTextCtrl::SetForegroundColour(const wxColour& colour)
 {
-    wxCHECK_MSG( m_text != NULL, FALSE, wxT("invalid text ctrl") );
+    if ( !wxControl::SetForegroundColour(colour) )
+        return FALSE;
 
-    // doesn't work
-    return FALSE;
+    // update default fg colour too
+    m_defaultStyle.SetTextColour(colour);
+
+    return TRUE;
 }
 
 bool wxTextCtrl::SetBackgroundColour( const wxColour &colour )
 {
     wxCHECK_MSG( m_text != NULL, FALSE, wxT("invalid text ctrl") );
 
-    wxControl::SetBackgroundColour( colour );
+    if ( !wxControl::SetBackgroundColour( colour ) )
+        return FALSE;
 
     if (!m_widget->window)
         return FALSE;
 
-    wxColour sysbg = wxSystemSettings::GetSystemColour( wxSYS_COLOUR_BTNFACE );
+    wxColour sysbg = wxSystemSettings::GetColour( wxSYS_COLOUR_BTNFACE );
     if (sysbg.Red() == colour.Red() &&
         sysbg.Green() == colour.Green() &&
         sysbg.Blue() == colour.Blue())
@@ -1110,9 +1080,66 @@ bool wxTextCtrl::SetBackgroundColour( const wxColour &colour )
         gdk_window_clear( window );
     }
 
+    // change active background color too
+    m_defaultStyle.SetBackgroundColour( colour );
+
     return TRUE;
 }
 
+bool wxTextCtrl::SetStyle( long start, long end, const wxTextAttr& style )
+{
+    /* VERY dirty way to do that - removes the required text and re-adds it
+       with styling (FIXME) */
+    if ( m_windowStyle & wxTE_MULTILINE )
+    {
+        if ( style.IsDefault() )
+        {
+            // nothing to do
+            return TRUE;
+        }
+
+        gint l = gtk_text_get_length( GTK_TEXT(m_text) );
+
+        wxCHECK_MSG( start >= 0 && end <= l, FALSE,
+                     _T("invalid range in wxTextCtrl::SetStyle") );
+
+        gint old_pos = gtk_editable_get_position( GTK_EDITABLE(m_text) );
+        char *text = gtk_editable_get_chars( GTK_EDITABLE(m_text), start, end );
+        wxString tmp(text,*wxConvCurrent);
+        g_free( text );
+
+        gtk_editable_delete_text( GTK_EDITABLE(m_text), start, end );
+        gtk_editable_set_position( GTK_EDITABLE(m_text), start );
+
+#if wxUSE_UNICODE
+        wxWX2MBbuf buf = tmp.mbc_str();
+        const char *txt = buf;
+        size_t txtlen = strlen(buf);
+#else
+        const char *txt = tmp;
+        size_t txtlen = tmp.length();
+#endif
+
+        // use the attributes from style which are set in it and fall back
+        // first to the default style and then to the text control default
+        // colours for the others
+        wxGtkTextInsert(m_text,
+                        wxTextAttr::Combine(style, m_defaultStyle, this),
+                        txt,
+                        txtlen);
+
+        /* does not seem to help under GTK+ 1.2 !!!
+        gtk_editable_set_position( GTK_EDITABLE(m_text), old_pos ); */
+        SetInsertionPoint( old_pos );
+        return TRUE;
+    }
+    else // singe line
+    {
+        // cannot do this for GTK+'s Entry widget
+        return FALSE;
+    }
+}
+
 void wxTextCtrl::ApplyWidgetStyle()
 {
     if (m_windowStyle & wxTE_MULTILINE)
@@ -1209,3 +1236,81 @@ wxSize wxTextCtrl::DoGetBestSize() const
     wxSize ret( wxControl::DoGetBestSize() );
     return wxSize(80, ret.y);
 }
+
+// ----------------------------------------------------------------------------
+// freeze/thaw
+// ----------------------------------------------------------------------------
+
+void wxTextCtrl::Freeze()
+{
+    if ( HasFlag(wxTE_MULTILINE) )
+    {
+        gtk_text_freeze(GTK_TEXT(m_text));
+    }
+}
+
+void wxTextCtrl::Thaw()
+{
+    if ( HasFlag(wxTE_MULTILINE) )
+    {
+        GTK_TEXT(m_text)->vadj->value = 0.0;
+
+        gtk_text_thaw(GTK_TEXT(m_text));
+    }
+}
+
+// ----------------------------------------------------------------------------
+// scrolling
+// ----------------------------------------------------------------------------
+
+GtkAdjustment *wxTextCtrl::GetVAdj() const
+{
+    return HasFlag(wxTE_MULTILINE) ? GTK_TEXT(m_text)->vadj : NULL;
+}
+
+bool wxTextCtrl::DoScroll(GtkAdjustment *adj, int diff)
+{
+    float value = adj->value + diff;
+
+    if ( value < 0 )
+        value = 0;
+
+    float upper = adj->upper - adj->page_size;
+    if ( value > upper )
+        value = upper;
+
+    // did we noticeably change the scroll position?
+    if ( fabs(adj->value - value) < 0.2 )
+    {
+        // well, this is what Robert does in wxScrollBar, so it must be good...
+        return FALSE;
+    }
+
+    adj->value = value;
+
+    gtk_signal_emit_by_name(GTK_OBJECT(adj), "value_changed");
+
+    return TRUE;
+}
+
+bool wxTextCtrl::ScrollLines(int lines)
+{
+    GtkAdjustment *adj = GetVAdj();
+    if ( !adj )
+        return FALSE;
+
+    // this is hardcoded to 10 in GTK+ 1.2 (great idea)
+    static const int KEY_SCROLL_PIXELS = 10;
+
+    return DoScroll(adj, lines*KEY_SCROLL_PIXELS);
+}
+
+bool wxTextCtrl::ScrollPages(int pages)
+{
+    GtkAdjustment *adj = GetVAdj();
+    if ( !adj )
+        return FALSE;
+
+    return DoScroll(adj, (int)ceil(pages*adj->page_increment));
+}
+