/////////////////////////////////////////////////////////////////////////////
// Name:        src/gtk/textctrl.cpp
// Purpose:
// Author:      Robert Roebling
// Copyright:   (c) 1998 Robert Roebling, Vadim Zeitlin, 2005 Mart Raudsepp
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#if wxUSE_TEXTCTRL

#include "wx/textctrl.h"

#ifndef WX_PRECOMP
    #include "wx/intl.h"
    #include "wx/log.h"
    #include "wx/utils.h"
    #include "wx/settings.h"
    #include "wx/math.h"
#endif

#include "wx/scopeguard.h"
#include "wx/strconv.h"
#include "wx/fontutil.h"        // for wxNativeFontInfo (GetNativeFontInfo())

#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>

#include "wx/gtk/private.h"
#include "wx/gtk/private/gtk3-compat.h"
#include "wx/gtk/private/threads.h"

#if wxUSE_SPELLCHECK && defined(__WXGTK3__)
extern "C" {
#include <gspell-1/gspell/gspell.h>
}
#endif // wxUSE_SPELLCHECK && __WXGTK3__

// ----------------------------------------------------------------------------
// helpers
// ----------------------------------------------------------------------------

extern "C" {
static void wxGtkOnRemoveTag(GtkTextBuffer *buffer,
                             GtkTextTag *tag,
                             GtkTextIter * WXUNUSED(start),
                             GtkTextIter * WXUNUSED(end),
                             char *prefix)
{
    wxGlibPtr<gchar> name;
    g_object_get (tag, "name", name.Out(), nullptr);

    if (!name || strncmp(name, prefix, strlen(prefix)))
        // anonymous tag or not starting with prefix - don't remove
        g_signal_stop_emission_by_name (buffer, "remove_tag");
}
}

// remove all tags starting with the given prefix from the start..end range
static void
wxGtkTextRemoveTagsWithPrefix(GtkTextBuffer *text_buffer,
                              const char *prefix,
                              GtkTextIter *start,
                              GtkTextIter *end)
{
    gulong remove_handler_id = g_signal_connect
                               (
                                text_buffer,
                                "remove_tag",
                                G_CALLBACK(wxGtkOnRemoveTag),
                                const_cast<void*>(static_cast<const void*>(prefix))
                               );
    gtk_text_buffer_remove_all_tags(text_buffer, start, end);
    g_signal_handler_disconnect(text_buffer, remove_handler_id);
}

static void wxGtkTextApplyTagsFromAttr(GtkWidget *text,
                                       GtkTextBuffer *text_buffer,
                                       const wxTextAttr& attr,
                                       GtkTextIter *start,
                                       GtkTextIter *end)
{
    static gchar buf[1024];
    GtkTextTag *tag;

    if (attr.HasFont())
    {
        wxGtkTextRemoveTagsWithPrefix(text_buffer, "WXFONT", start, end);

        wxFont font(attr.GetFont());

        PangoFontDescription *font_description = font.GetNativeFontInfo()->description;
        wxGtkString font_string(pango_font_description_to_string(font_description));
        g_snprintf(buf, sizeof(buf), "WXFONT %s", font_string.c_str());
        tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                         buf );
        if (!tag)
            tag = gtk_text_buffer_create_tag( text_buffer, buf,
                                              "font-desc", font_description,
                                              nullptr );
        gtk_text_buffer_apply_tag (text_buffer, tag, start, end);

        if (font.GetUnderlined())
        {
            g_snprintf(buf, sizeof(buf), "WXFONTUNDERLINE");
            tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                             buf );
            if (!tag)
                tag = gtk_text_buffer_create_tag( text_buffer, buf,
                                                  "underline-set", TRUE,
                                                  "underline", PANGO_UNDERLINE_SINGLE,
                                                  nullptr );
            gtk_text_buffer_apply_tag (text_buffer, tag, start, end);
        }
        if ( font.GetStrikethrough() )
        {
            g_snprintf(buf, sizeof(buf), "WXFONTSTRIKETHROUGH");
            tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                             buf );
            if (!tag)
                tag = gtk_text_buffer_create_tag( text_buffer, buf,
                                                  "strikethrough-set", TRUE,
                                                  "strikethrough", TRUE,
                                                  nullptr );
            gtk_text_buffer_apply_tag (text_buffer, tag, start, end);
        }
    }

    if ( attr.HasFontUnderlined() )
    {
        PangoUnderline pangoUnderlineStyle = PANGO_UNDERLINE_NONE;
        switch ( attr.GetUnderlineType() )
        {
            case wxTEXT_ATTR_UNDERLINE_SOLID:
                pangoUnderlineStyle = PANGO_UNDERLINE_SINGLE;
                break;
            case wxTEXT_ATTR_UNDERLINE_DOUBLE:
                pangoUnderlineStyle = PANGO_UNDERLINE_DOUBLE;
                break;
            case wxTEXT_ATTR_UNDERLINE_SPECIAL:
                pangoUnderlineStyle = PANGO_UNDERLINE_ERROR;
                break;
            default:
                pangoUnderlineStyle = PANGO_UNDERLINE_NONE;
                break;
        }

        g_snprintf(buf, sizeof(buf), "WXFONTUNDERLINESTYLE %u",
                                     (unsigned)pangoUnderlineStyle);
        tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                         buf );
        if (!tag)
            tag = gtk_text_buffer_create_tag( text_buffer, buf,
                                              "underline-set", TRUE,
                                              "underline", pangoUnderlineStyle,
                                              nullptr );
        gtk_text_buffer_apply_tag (text_buffer, tag, start, end);

#ifdef __WXGTK3__
        if ( wx_is_at_least_gtk3(16) )
        {
            wxColour colour = attr.GetUnderlineColour();
            if ( colour.IsOk() )
            {
                g_snprintf(buf, sizeof(buf), "WXFONTUNDERLINECOLOUR %u %u %u %u",
                           colour.Red(), colour.Green(), colour.Blue(), colour.Alpha());
                tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                                 buf );
                if (!tag)
                    tag = gtk_text_buffer_create_tag( text_buffer, buf,
                                                      "underline-rgba-set", TRUE,
                                                      "underline-rgba", static_cast<const GdkRGBA*>(colour),
                                                      nullptr );
                gtk_text_buffer_apply_tag (text_buffer, tag, start, end);
            }
        }
#endif
    }

    if (attr.HasTextColour())
    {
        wxGtkTextRemoveTagsWithPrefix(text_buffer, "WXFORECOLOR", start, end);

        const GdkColor *colFg = attr.GetTextColour().GetColor();
        g_snprintf(buf, sizeof(buf), "WXFORECOLOR %d %d %d",
                   colFg->red, colFg->green, colFg->blue);
        tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                         buf );
        if (!tag)
            tag = gtk_text_buffer_create_tag( text_buffer, buf,
                                              "foreground-gdk", colFg, nullptr );
        gtk_text_buffer_apply_tag (text_buffer, tag, start, end);
    }

    if (attr.HasBackgroundColour())
    {
        wxGtkTextRemoveTagsWithPrefix(text_buffer, "WXBACKCOLOR", start, end);

        const GdkColor *colBg = attr.GetBackgroundColour().GetColor();
        g_snprintf(buf, sizeof(buf), "WXBACKCOLOR %d %d %d",
                   colBg->red, colBg->green, colBg->blue);
        tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                         buf );
        if (!tag)
            tag = gtk_text_buffer_create_tag( text_buffer, buf,
                                              "background-gdk", colBg, nullptr );
        gtk_text_buffer_apply_tag (text_buffer, tag, start, end);
    }

    if (attr.HasAlignment())
    {
        GtkTextIter para_start, para_end = *end;
        gtk_text_buffer_get_iter_at_line( text_buffer,
                                          &para_start,
                                          gtk_text_iter_get_line(start) );
        gtk_text_iter_forward_line(&para_end);

        wxGtkTextRemoveTagsWithPrefix(text_buffer, "WXALIGNMENT", &para_start, &para_end);

        GtkJustification align;
        switch (attr.GetAlignment())
        {
            case wxTEXT_ALIGNMENT_RIGHT:
                align = GTK_JUSTIFY_RIGHT;
                break;
            case wxTEXT_ALIGNMENT_CENTER:
                align = GTK_JUSTIFY_CENTER;
                break;
            case wxTEXT_ALIGNMENT_JUSTIFIED:
#ifdef __WXGTK3__
                align = GTK_JUSTIFY_FILL;
                break;
#elif GTK_CHECK_VERSION(2,11,0)
// gtk+ doesn't support justify before gtk+-2.11.0 with pango-1.17 being available
// (but if new enough pango isn't available it's a mere gtk warning)
                if (wx_is_at_least_gtk2(11))
                {
                    align = GTK_JUSTIFY_FILL;
                    break;
                }
                wxFALLTHROUGH;
#endif
            default:
                align = GTK_JUSTIFY_LEFT;
                break;
        }

        g_snprintf(buf, sizeof(buf), "WXALIGNMENT %d", align);
        tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                         buf );
        if (!tag)
            tag = gtk_text_buffer_create_tag( text_buffer, buf,
                                              "justification", align, nullptr );
        gtk_text_buffer_apply_tag( text_buffer, tag, &para_start, &para_end );
    }

    if (attr.HasLeftIndent())
    {
        // Indentation attribute

        // Clear old indentation tags
        GtkTextIter para_start, para_end = *end;
        gtk_text_buffer_get_iter_at_line( text_buffer,
                                          &para_start,
                                          gtk_text_iter_get_line(start) );
        gtk_text_iter_forward_line(&para_end);

        wxGtkTextRemoveTagsWithPrefix(text_buffer, "WXINDENT", &para_start, &para_end);

        // Convert indent from 1/10th of a mm into pixels
#ifdef __WXGTK4__
        GdkMonitor* monitor = gdk_display_get_monitor_at_window(
            gtk_widget_get_display(text), gtk_widget_get_window(text));
        GdkRectangle rect;
        gdk_monitor_get_geometry(monitor, &rect);
        float factor = float(rect.width) / gdk_monitor_get_width_mm(monitor);
#else
        wxGCC_WARNING_SUPPRESS(deprecated-declarations)
        float factor =
            (float)gdk_screen_get_width(gtk_widget_get_screen(text)) /
                      gdk_screen_get_width_mm(gtk_widget_get_screen(text)) / 10;
        wxGCC_WARNING_RESTORE()
#endif

        const int indent = (int)(factor * attr.GetLeftIndent());
        const int subIndent = (int)(factor * attr.GetLeftSubIndent());

        gint gindent;
        gint gsubindent;

        if (subIndent >= 0)
        {
            gindent = indent;
            gsubindent = -subIndent;
        }
        else
        {
            gindent = -subIndent;
            gsubindent = indent;
        }

        g_snprintf(buf, sizeof(buf), "WXINDENT %d %d", gindent, gsubindent);
        tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                        buf );
        if (!tag)
            tag = gtk_text_buffer_create_tag( text_buffer, buf,
                                              "left-margin", gindent, "indent", gsubindent, nullptr );
        gtk_text_buffer_apply_tag (text_buffer, tag, &para_start, &para_end);
    }

    if (attr.HasTabs())
    {
        // Set tab stops

        // Clear old tabs
        GtkTextIter para_start, para_end = *end;
        gtk_text_buffer_get_iter_at_line( text_buffer,
                                          &para_start,
                                          gtk_text_iter_get_line(start) );
        gtk_text_iter_forward_line(&para_end);

        wxGtkTextRemoveTagsWithPrefix(text_buffer, "WXTABS", &para_start, &para_end);

        const wxArrayInt& tabs = attr.GetTabs();

        wxString tagname = wxT("WXTABS");
        g_snprintf(buf, sizeof(buf), "WXTABS");
        for (size_t i = 0; i < tabs.GetCount(); i++)
            tagname += wxString::Format(wxT(" %d"), tabs[i]);

        const wxWX2MBbuf buftag = tagname.utf8_str();

        tag = gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table( text_buffer ),
                                        buftag );
        if (!tag)
        {
            // Factor to convert from 1/10th of a mm into pixels
#ifdef __WXGTK4__
            GdkMonitor* monitor = gdk_display_get_monitor_at_window(
                gtk_widget_get_display(text), gtk_widget_get_window(text));
            GdkRectangle rect;
            gdk_monitor_get_geometry(monitor, &rect);
            float factor = float(rect.width) / gdk_monitor_get_width_mm(monitor);
#else
            wxGCC_WARNING_SUPPRESS(deprecated-declarations)
            float factor =
                (float)gdk_screen_get_width(gtk_widget_get_screen(text)) /
                          gdk_screen_get_width_mm(gtk_widget_get_screen(text)) / 10;
            wxGCC_WARNING_RESTORE()
#endif
            PangoTabArray* tabArray = pango_tab_array_new(tabs.GetCount(), TRUE);
            for (size_t i = 0; i < tabs.GetCount(); i++)
                pango_tab_array_set_tab(tabArray, i, PANGO_TAB_LEFT, (gint)(tabs[i] * factor));
            tag = gtk_text_buffer_create_tag( text_buffer, buftag,
                                              "tabs", tabArray, nullptr );
            pango_tab_array_free(tabArray);
        }
        gtk_text_buffer_apply_tag (text_buffer, tag, &para_start, &para_end);
    }
}

// Implementation of wxTE_AUTO_URL for wxGTK2 by Mart Raudsepp,

extern "C" {
static void
au_apply_tag_callback(GtkTextBuffer *buffer,
                      GtkTextTag *tag,
                      GtkTextIter * WXUNUSED(start),
                      GtkTextIter * WXUNUSED(end),
                      gpointer WXUNUSED(textctrl))
{
    if(tag == gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "wxUrl"))
        g_signal_stop_emission_by_name (buffer, "apply_tag");
}
}

// Check if the style contains wxTE_PROCESS_TAB and update the given
// GtkTextView accordingly.
static void wxGtkSetAcceptsTab(GtkWidget* text, long style)
{
    gtk_text_view_set_accepts_tab(GTK_TEXT_VIEW(text),
                                  (style & wxTE_PROCESS_TAB) != 0);
}

//-----------------------------------------------------------------------------
//  GtkTextCharPredicates for gtk_text_iter_*_find_char
//-----------------------------------------------------------------------------

extern "C" {
static gboolean
pred_whitespace(gunichar ch, gpointer WXUNUSED(user_data))
{
    return g_unichar_isspace(ch);
}
}

extern "C" {
static gboolean
pred_non_whitespace (gunichar ch, gpointer WXUNUSED(user_data))
{
    return !g_unichar_isspace(ch);
}
}

extern "C" {
static gboolean
pred_nonpunct (gunichar ch, gpointer WXUNUSED(user_data))
{
    return !g_unichar_ispunct(ch);
}
}

extern "C" {
static gboolean
pred_nonpunct_or_slash (gunichar ch, gpointer WXUNUSED(user_data))
{
    return !g_unichar_ispunct(ch) || ch == '/';
}
}

//-----------------------------------------------------------------------------
//  Check for links between s and e and correct tags as necessary
//-----------------------------------------------------------------------------

// This function should be made match better while being efficient at one point.
// Most probably with a row of regular expressions.
extern "C" {
static void
au_check_word( GtkTextIter *s, GtkTextIter *e )
{
    static const char *const URIPrefixes[] =
    {
        "http://",
        "ftp://",
        "www.",
        "ftp.",
        "mailto://",
        "https://",
        "file://",
        "nntp://",
        "news://",
        "telnet://",
        "mms://",
        "gopher://",
        "prospero://",
        "wais://",
    };

    GtkTextIter start = *s, end = *e;
    GtkTextBuffer *buffer = gtk_text_iter_get_buffer(s);

    // Get our special link tag
    GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "wxUrl");

    // Get rid of punctuation from beginning and end.
    // Might want to move this to au_check_range if an improved link checking doesn't
    // use some intelligent punctuation checking itself (beware of undesired iter modifications).
    if(g_unichar_ispunct( gtk_text_iter_get_char( &start ) ) )
        gtk_text_iter_forward_find_char( &start, pred_nonpunct, nullptr, e );

    gtk_text_iter_backward_find_char( &end, pred_nonpunct_or_slash, nullptr, &start );
    gtk_text_iter_forward_char(&end);

    wxGtkString text(gtk_text_iter_get_text( &start, &end ));
    size_t len = strlen(text);
    size_t n;

    for( n = 0; n < WXSIZEOF(URIPrefixes); ++n )
    {
        size_t prefix_len;
        prefix_len = strlen(URIPrefixes[n]);
        if((len > prefix_len) && !wxStrnicmp(text, URIPrefixes[n], prefix_len))
            break;
    }

    if(n < WXSIZEOF(URIPrefixes))
    {
        gulong signal_id = g_signal_handler_find (buffer,
                                                  (GSignalMatchType) (G_SIGNAL_MATCH_FUNC),
                                                  0, 0, nullptr,
                                                  (gpointer)au_apply_tag_callback, nullptr);

        g_signal_handler_block (buffer, signal_id);
        gtk_text_buffer_apply_tag(buffer, tag, &start, &end);
        g_signal_handler_unblock (buffer, signal_id);
    }
}
}

extern "C" {
static void
au_check_range(GtkTextIter *s,
               GtkTextIter *range_end)
{
    GtkTextIter range_start = *s;
    GtkTextIter word_end;
    GtkTextBuffer *buffer = gtk_text_iter_get_buffer(s);
    GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "wxUrl");

    gtk_text_buffer_remove_tag(buffer, tag, s, range_end);

    if(g_unichar_isspace(gtk_text_iter_get_char(&range_start)))
        gtk_text_iter_forward_find_char(&range_start, pred_non_whitespace, nullptr, range_end);

    while(!gtk_text_iter_equal(&range_start, range_end))
    {
        word_end = range_start;
        gtk_text_iter_forward_find_char(&word_end, pred_whitespace, nullptr, range_end);

        // Now we should have a word delimited by range_start and word_end, correct link tags
        au_check_word(&range_start, &word_end);

        range_start = word_end;
        gtk_text_iter_forward_find_char(&range_start, pred_non_whitespace, nullptr, range_end);
    }
}
}

//-----------------------------------------------------------------------------
//  "insert-text" for GtkTextBuffer
//-----------------------------------------------------------------------------

extern "C" {

// Normal version used for detecting IME input and generating appropriate
// events for it.
static void
wx_insert_text_callback(GtkTextBuffer* buffer,
                        GtkTextIter* WXUNUSED(end),
                        gchar *text,
                        gint WXUNUSED(len),
                        wxTextCtrl *win)
{
    if ( win->GTKOnInsertText(text) )
    {
        // If we already handled the new text insertion, don't do it again.
        g_signal_stop_emission_by_name (buffer, "insert_text");
    }
}


// And an "after" version used for detecting URLs in the text, applying custom
// styles and enforcing max length limit.
static void
au_insert_text_callback(GtkTextBuffer *buffer,
                        GtkTextIter *end,
                        gchar *text,
                        gint len,
                        wxTextCtrl *win)
{
    GtkTextIter start = *end;
    gtk_text_iter_backward_chars(&start, g_utf8_strlen(text, len));

    if ( !win->GetDefaultStyle().IsDefault() )
    {
        wxGtkTextApplyTagsFromAttr(win->GetHandle(), buffer, win->GetDefaultStyle(),
                                   &start, end);
    }

    const auto maxlen = win->GTKGetMaxLength();
    if ( maxlen > 0 )
    {
        const auto count = gtk_text_buffer_get_char_count( buffer );
        if ( count > maxlen )
        {
            // Trim the extraneous characters.
            int toTrim = count - maxlen;
            GtkTextIter offset;
            gtk_text_buffer_get_iter_at_offset(
                buffer,
                &offset,
                gtk_text_iter_get_offset( end ) - toTrim
            );
            gtk_text_buffer_delete( buffer, &offset, end );

            // And notify the application about hitting the limit.
            win->IgnoreNextTextUpdate();
            win->SendMaxLenEvent();
        }
    }

    if ( !len || !(win->GetWindowStyleFlag() & wxTE_AUTO_URL) )
        return;

    GtkTextIter line_start = start;
    GtkTextIter line_end = *end;
    GtkTextIter words_start = start;
    GtkTextIter words_end = *end;

    gtk_text_iter_set_line(&line_start, gtk_text_iter_get_line(&start));
    gtk_text_iter_forward_to_line_end(&line_end);
    gtk_text_iter_backward_find_char(&words_start, pred_whitespace, nullptr, &line_start);
    gtk_text_iter_forward_find_char(&words_end, pred_whitespace, nullptr, &line_end);

    au_check_range(&words_start, &words_end);
}
}

//-----------------------------------------------------------------------------
//  "delete-range" for GtkTextBuffer
//-----------------------------------------------------------------------------

extern "C" {
static void
au_delete_range_callback(GtkTextBuffer * WXUNUSED(buffer),
                         GtkTextIter *start,
                         GtkTextIter *end,
                         wxTextCtrl *win)
{
    if( !(win->GetWindowStyleFlag() & wxTE_AUTO_URL) )
        return;

    GtkTextIter line_start = *start, line_end = *end;

    gtk_text_iter_set_line(&line_start, gtk_text_iter_get_line(start));
    gtk_text_iter_forward_to_line_end(&line_end);
    gtk_text_iter_backward_find_char(start, pred_whitespace, nullptr, &line_start);
    gtk_text_iter_forward_find_char(end, pred_whitespace, nullptr, &line_end);

    au_check_range(start, end);
}
}

//-----------------------------------------------------------------------------
//  "populate_popup" from text control and "unmap" from its poup menu
//-----------------------------------------------------------------------------

extern "C" {
static void
gtk_textctrl_popup_unmap( GtkMenu *WXUNUSED(menu), wxTextCtrl* win )
{
    win->GTKEnableFocusOutEvent();
}
}

extern "C" {
static void
gtk_textctrl_populate_popup( GtkEntry *WXUNUSED(entry), GtkMenu *menu, wxTextCtrl *win )
{
    win->GTKDisableFocusOutEvent();

    g_signal_connect (menu, "unmap", G_CALLBACK (gtk_textctrl_popup_unmap), win );
}
}

//-----------------------------------------------------------------------------
//  "mark_set"
//-----------------------------------------------------------------------------

extern "C" {
static void mark_set(GtkTextBuffer*, GtkTextIter*, GtkTextMark* mark, GSList** markList)
{
    if (gtk_text_mark_get_name(mark) == nullptr)
        *markList = g_slist_prepend(*markList, g_object_ref(mark));
}
}

#ifdef __WXGTK3__
//-----------------------------------------------------------------------------
//  "state_flags_changed"
//-----------------------------------------------------------------------------
extern "C" {
static void state_flags_changed(GtkWidget*, GtkStateFlags, wxTextCtrl* win)
{
    // restore non-default cursor, if any
    win->GTKApplyCursor();
}
}
#endif // __WXGTK3__

//-----------------------------------------------------------------------------
//  wxTextCtrl
//-----------------------------------------------------------------------------

wxBEGIN_EVENT_TABLE(wxTextCtrl, wxTextCtrlBase)
    EVT_CHAR(wxTextCtrl::OnChar)

    EVT_MENU(wxID_CUT, wxTextCtrl::OnCut)
    EVT_MENU(wxID_COPY, wxTextCtrl::OnCopy)
    EVT_MENU(wxID_PASTE, wxTextCtrl::OnPaste)
    EVT_MENU(wxID_UNDO, wxTextCtrl::OnUndo)
    EVT_MENU(wxID_REDO, wxTextCtrl::OnRedo)

    EVT_UPDATE_UI(wxID_CUT, wxTextCtrl::OnUpdateCut)
    EVT_UPDATE_UI(wxID_COPY, wxTextCtrl::OnUpdateCopy)
    EVT_UPDATE_UI(wxID_PASTE, wxTextCtrl::OnUpdatePaste)
    EVT_UPDATE_UI(wxID_UNDO, wxTextCtrl::OnUpdateUndo)
    EVT_UPDATE_UI(wxID_REDO, wxTextCtrl::OnUpdateRedo)

    // wxTE_AUTO_URL wxTextUrl support. Currently only creates
    // wxTextUrlEvent in the same cases as wxMSW, more can be added here.
    EVT_MOTION      (wxTextCtrl::OnUrlMouseEvent)
    EVT_LEFT_DOWN   (wxTextCtrl::OnUrlMouseEvent)
    EVT_LEFT_UP     (wxTextCtrl::OnUrlMouseEvent)
    EVT_LEFT_DCLICK (wxTextCtrl::OnUrlMouseEvent)
    EVT_RIGHT_DOWN  (wxTextCtrl::OnUrlMouseEvent)
    EVT_RIGHT_UP    (wxTextCtrl::OnUrlMouseEvent)
    EVT_RIGHT_DCLICK(wxTextCtrl::OnUrlMouseEvent)
wxEND_EVENT_TABLE()

void wxTextCtrl::Init()
{
    m_dontMarkDirty =
    m_modified = false;

    m_countUpdatesToIgnore = 0;

    SetUpdateFont(false);

    m_text = nullptr;
    m_buffer = nullptr;
    m_showPositionDefer = nullptr;
    m_anonymousMarkList = nullptr;
    m_afterLayoutId = 0;
}

wxTextCtrl::~wxTextCtrl()
{
    if (m_text)
        GTKDisconnect(m_text);
    if (m_buffer)
        GTKDisconnect(m_buffer);

    // this is also done by wxWindowGTK dtor, but has to be done here so our
    // DoThaw() override is called
    while (IsFrozen())
        Thaw();

    if (m_anonymousMarkList)
        g_slist_free_full(m_anonymousMarkList, g_object_unref);
    if (m_afterLayoutId)
        g_source_remove(m_afterLayoutId);
}

wxTextCtrl::wxTextCtrl( wxWindow *parent,
                        wxWindowID id,
                        const wxString &value,
                        const wxPoint &pos,
                        const wxSize &size,
                        long style,
                        const wxValidator& validator,
                        const wxString &name )
{
    Init();

    Create( parent, id, value, pos, size, style, validator, name );
}

bool wxTextCtrl::Create( wxWindow *parent,
                         wxWindowID id,
                         const wxString &value,
                         const wxPoint &pos,
                         const wxSize &size,
                         long style,
                         const wxValidator& validator,
                         const wxString &name )
{
    if (!PreCreation( parent, pos, size ) ||
        !CreateBase( parent, id, pos, size, style, validator, name ))
    {
        wxFAIL_MSG( wxT("wxTextCtrl creation failed") );
        return false;
    }

    bool multi_line = (style & wxTE_MULTILINE) != 0;

    if (multi_line)
    {
        m_buffer = gtk_text_buffer_new(nullptr);
        gulong sig_id = g_signal_connect(m_buffer, "mark_set", G_CALLBACK(mark_set), &m_anonymousMarkList);
        // Create view
        m_text = gtk_text_view_new_with_buffer(m_buffer);
        GTKConnectFreezeWidget(m_text);
        // gtk_text_view_set_buffer adds its own reference
        g_object_unref(m_buffer);
        g_signal_handler_disconnect(m_buffer, sig_id);

        // 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( nullptr, nullptr );
        gtk_scrolled_window_set_policy( GTK_SCROLLED_WINDOW( m_widget ),
                                        GTK_POLICY_AUTOMATIC,
                                        style & wxTE_NO_VSCROLL
                                            ? GTK_POLICY_NEVER
                                            : GTK_POLICY_AUTOMATIC );
        // for ScrollLines/Pages
        m_scrollBar[1] = GTK_RANGE(gtk_scrolled_window_get_vscrollbar(GTK_SCROLLED_WINDOW(m_widget)));

        // Insert view into scrolled window
        gtk_container_add( GTK_CONTAINER(m_widget), m_text );

        GTKSetWrapMode();

        GTKScrolledWindowSetBorder(m_widget, style);

        gtk_widget_add_events( GTK_WIDGET(m_text), GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK );

        gtk_widget_set_can_focus(m_widget, FALSE);
    }
    else
    {
        // a single-line text control: no need for scrollbars
        m_widget =
        m_text = gtk_entry_new();

        // Set a minimal width for preferred size to avoid GTK3 debug warnings
        // about size allocations smaller than preferred size
        gtk_entry_set_width_chars((GtkEntry*)m_text, 1);

        // work around probable bug in GTK+ 2.18 when calling WriteText on a
        // new, empty control, see https://github.com/wxWidgets/wxWidgets/issues/11409
        gtk_entry_get_text((GtkEntry*)m_text);

        if (style & wxNO_BORDER)
            gtk_entry_set_has_frame((GtkEntry*)m_text, FALSE);
    }
    g_object_ref(m_widget);

    m_parent->DoAddChild( this );

    m_focusWidget = m_text;

    PostCreation(size);

    if (multi_line)
    {
        gtk_widget_show(m_text);
    }

    // We want to be notified about text changes.
    GTKConnectChangedSignal();

    // Catch to disable focus out handling
    g_signal_connect (m_text, "populate_popup",
                      G_CALLBACK (gtk_textctrl_populate_popup),
                      this);

    if (!value.empty())
    {
        ChangeValue(value);

        // The call to SetInitialSize() from inside PostCreation() didn't take
        // the value into account because it hadn't been set yet when it was
        // called (and setting it earlier wouldn't have been correct either,
        // as the appropriate size depends on the presence of the borders,
        // which are configured in PostCreation()), so recompute the initial
        // size again now that we have set it.
        SetInitialSize(size);
    }

    if (style & wxTE_PASSWORD)
        GTKSetVisibility();

    if (style & wxTE_READONLY)
        GTKSetEditable();

    // left justification (alignment) is the default anyhow
    if ( style & (wxTE_RIGHT | wxTE_CENTRE) )
        GTKSetJustification();

    if (multi_line)
    {
        wxGtkSetAcceptsTab(m_text, style);

        // Handle URLs on multi-line controls with wxTE_AUTO_URL style
        if (style & wxTE_AUTO_URL)
        {
            GtkTextIter start, end;

            // We create our wxUrl tag here for slight efficiency gain - we
            // don't have to check for the tag existence in callbacks,
            // hereby it's guaranteed to exist.
            gtk_text_buffer_create_tag(m_buffer, "wxUrl",
                                       "foreground", "blue",
                                       "underline", PANGO_UNDERLINE_SINGLE,
                                       nullptr);

            g_signal_connect_after (m_buffer, "delete_range",
                                    G_CALLBACK (au_delete_range_callback), this);

            // Block all wxUrl tag applying unless we do it ourselves, in which case we
            // block this callback temporarily. This takes care of gtk+ internal
            // gtk_text_buffer_insert_range* calls that would copy our URL tag otherwise,
            // which is undesired because only a part of the URL might be copied.
            // The insert-text signal emitted inside it will take care of newly formed
            // or wholly copied URLs.
            g_signal_connect (m_buffer, "apply_tag",
                              G_CALLBACK (au_apply_tag_callback), nullptr);

            // Check for URLs in the initial string passed to Create
            gtk_text_buffer_get_start_iter(m_buffer, &start);
            gtk_text_buffer_get_end_iter(m_buffer, &end);
            au_check_range(&start, &end);
        }

        // Also connect a normal (not "after") signal handler for checking for
        // the IME-generated input.
        g_signal_connect(m_buffer, "insert_text",
                         G_CALLBACK(wx_insert_text_callback), this);

        // Needed for wxTE_AUTO_URL, applying custom styles and max length
        // limit support.
        g_signal_connect_after(m_buffer, "insert_text",
                               G_CALLBACK(au_insert_text_callback), this);
    }
    else // single line
    {
        // do the right thing with Enter presses depending on whether we have
        // wxTE_PROCESS_ENTER or not
        GTKSetActivatesDefault();

        GTKConnectInsertTextSignal(GTK_ENTRY(m_text));
    }

    GTKConnectClipboardSignals(m_text);

#ifdef __WXGTK3__
    g_signal_connect(m_text, "state_flags_changed", G_CALLBACK(state_flags_changed), this);
#endif

    return true;
}

GtkEditable *wxTextCtrl::GetEditable() const
{
    wxCHECK_MSG( IsSingleLine(), nullptr, "shouldn't be called for multiline" );

    return GTK_EDITABLE(m_text);
}

void wxTextCtrl::SetMaxLength(unsigned long length)
{
    if ( IsMultiLine() )
    {
        m_maxlen = length;
    }
    else
    {
        wxTextEntry::SetMaxLength( length );
    }
}

GtkEntry *wxTextCtrl::GetEntry() const
{
    if (GTK_IS_ENTRY(m_text))
        return (GtkEntry*)m_text;

    return nullptr;
}

int wxTextCtrl::GTKIMFilterKeypress(GdkEventKey* event) const
{
    if (IsSingleLine())
        return GTKEntryIMFilterKeypress(event);

    // When not calling GTKEntryIMFilterKeypress(), we need to notify the code
    // in wxTextEntry about the key presses explicitly.
    GTKEntryOnKeypress(m_text);

    int result = false;
#if GTK_CHECK_VERSION(2, 22, 0)
    if (wx_is_at_least_gtk2(22))
    {
        result = gtk_text_view_im_context_filter_keypress(GTK_TEXT_VIEW(m_text), event);
    }
#else // GTK+ < 2.22
    wxUnusedVar(event);
#endif // GTK+ 2.22+

    return result;
}

// ----------------------------------------------------------------------------
// flags handling
// ----------------------------------------------------------------------------

void wxTextCtrl::GTKSetEditable()
{
    gboolean editable = !HasFlag(wxTE_READONLY);
    if ( IsSingleLine() )
        gtk_editable_set_editable(GTK_EDITABLE(m_text), editable);
    else
        gtk_text_view_set_editable(GTK_TEXT_VIEW(m_text), editable);
}

void wxTextCtrl::GTKSetVisibility()
{
    wxCHECK_RET( IsSingleLine(),
                 "wxTE_PASSWORD is for single line text controls only" );

    gtk_entry_set_visibility(GTK_ENTRY(m_text), !HasFlag(wxTE_PASSWORD));
}

void wxTextCtrl::GTKSetActivatesDefault()
{
    wxCHECK_RET( IsSingleLine(),
                 "wxTE_PROCESS_ENTER is for single line text controls only" );

    gtk_entry_set_activates_default(GTK_ENTRY(m_text),
                                    !HasFlag(wxTE_PROCESS_ENTER));
}

void wxTextCtrl::GTKSetWrapMode()
{
    // no wrapping in single line controls
    if ( !IsMultiLine() )
        return;

    // translate wx wrapping style to GTK+
    GtkWrapMode wrap;
    if ( HasFlag( wxTE_DONTWRAP ) )
        wrap = GTK_WRAP_NONE;
    else if ( HasFlag( wxTE_CHARWRAP ) )
        wrap = GTK_WRAP_CHAR;
    else if ( HasFlag( wxTE_WORDWRAP ) )
        wrap = GTK_WRAP_WORD;
    else // HasFlag(wxTE_BESTWRAP) always true as wxTE_BESTWRAP == 0
        wrap = GTK_WRAP_WORD_CHAR;

    gtk_text_view_set_wrap_mode( GTK_TEXT_VIEW( m_text ), wrap );
}

void wxTextCtrl::GTKSetJustification()
{
    if ( IsMultiLine() )
    {
        GtkJustification just;
        if ( HasFlag(wxTE_RIGHT) )
            just = GTK_JUSTIFY_RIGHT;
        else if ( HasFlag(wxTE_CENTRE) )
            just = GTK_JUSTIFY_CENTER;
        else // wxTE_LEFT == 0
            just = GTK_JUSTIFY_LEFT;

        gtk_text_view_set_justification(GTK_TEXT_VIEW(m_text), just);
    }
    else // single line
    {
        gfloat align;
        if ( HasFlag(wxTE_RIGHT) )
            align = 1.0;
        else if ( HasFlag(wxTE_CENTRE) )
            align = 0.5;
        else // single line
            align = 0.0;

        gtk_entry_set_alignment(GTK_ENTRY(m_text), align);
    }
}

#if wxUSE_SPELLCHECK && defined(__WXGTK3__)

bool wxTextCtrl::EnableProofCheck(const wxTextProofOptions& options)
{
    if ( IsMultiLine() )
    {
        GtkTextView *textview = GTK_TEXT_VIEW(m_text);
        wxCHECK_MSG( textview, false, wxS("wxTextCtrl is not a GtkTextView") );

        GspellTextView *spell = gspell_text_view_get_from_gtk_text_view (textview);
        if ( !spell )
            return false;

        gspell_text_view_basic_setup(spell);
        gspell_text_view_set_inline_spell_checking(spell, options.IsSpellCheckEnabled());
        gspell_text_view_set_enable_language_menu(spell, options.IsSpellCheckEnabled());
    }
    else
    {
        GtkEntry *entry = GTK_ENTRY(m_text);
        wxCHECK_MSG( entry, false, wxS("wxTextCtrl is not a GtkEntry") );

        GspellEntry *spell = gspell_entry_get_from_gtk_entry(entry);
        if ( !spell )
            return false;

        gspell_entry_basic_setup(spell);
        gspell_entry_set_inline_spell_checking(spell, options.IsSpellCheckEnabled());
    }

    return GetProofCheckOptions().IsSpellCheckEnabled() == options.IsSpellCheckEnabled();
}

wxTextProofOptions wxTextCtrl::GetProofCheckOptions() const
{
    wxTextProofOptions opts = wxTextProofOptions::Disable();

    if ( IsMultiLine() )
    {
        GtkTextView *textview = GTK_TEXT_VIEW(m_text);

        if ( textview )
        {
            GspellTextView *spell = gspell_text_view_get_from_gtk_text_view (textview);
            if ( spell && gspell_text_view_get_inline_spell_checking(spell) )
                opts.SpellCheck();
        }
    }

    else
    {
        GtkEntry *entry = GTK_ENTRY(m_text);

        if ( entry )
        {
            GspellEntry *spell = gspell_entry_get_from_gtk_entry(entry);
            if ( spell && gspell_entry_get_inline_spell_checking(spell) )
                opts.SpellCheck();
        }
    }

    return opts;
}

#endif // wxUSE_SPELLCHECK && __WXGTK3__

void wxTextCtrl::SetWindowStyleFlag(long style)
{
    long styleOld = GetWindowStyleFlag();

    wxTextCtrlBase::SetWindowStyleFlag(style);

    if ( (style & wxTE_READONLY) != (styleOld & wxTE_READONLY) )
        GTKSetEditable();

    if ( (style & wxTE_PASSWORD) != (styleOld & wxTE_PASSWORD) )
        GTKSetVisibility();

    if ( (style & wxTE_PROCESS_ENTER) != (styleOld & wxTE_PROCESS_ENTER) )
        GTKSetActivatesDefault();

    if ( IsMultiLine() )
    {
        wxGtkSetAcceptsTab(m_text, style);
    }
    //else: there doesn't seem to be any way to do it for entries and while we
    //      could emulate wxTE_PROCESS_TAB for them by handling Tab key events
    //      explicitly, it doesn't seem to be worth doing it, this style is
    //      pretty useless with single-line controls.

    static const long flagsWrap = wxTE_WORDWRAP | wxTE_CHARWRAP | wxTE_DONTWRAP;
    if ( (style & flagsWrap) != (styleOld & flagsWrap) )
        GTKSetWrapMode();

    static const long flagsAlign = wxTE_LEFT | wxTE_CENTRE | wxTE_RIGHT;
    if ( (style & flagsAlign) != (styleOld & flagsAlign) )
        GTKSetJustification();
}

// ----------------------------------------------------------------------------
// control value
// ----------------------------------------------------------------------------

wxString wxTextCtrl::GetValue() const
{
    wxCHECK_MSG( m_text != nullptr, wxEmptyString, wxT("invalid text ctrl") );

    return wxTextEntry::GetValue();
}

wxString wxTextCtrl::DoGetValue() const
{
    if ( IsMultiLine() )
    {
        GtkTextIter start;
        gtk_text_buffer_get_start_iter( m_buffer, &start );
        GtkTextIter end;
        gtk_text_buffer_get_end_iter( m_buffer, &end );
        wxGtkString text(gtk_text_buffer_get_text(m_buffer, &start, &end, true));

        return wxString::FromUTF8Unchecked(text);
    }
    else // single line
    {
        return wxTextEntry::DoGetValue();
    }
}

wxFontEncoding wxTextCtrl::GetTextEncoding() const
{
    // GTK+ uses UTF-8 internally, we need to convert to it but from which
    // encoding?

    // first check the default text style (we intentionally don't check the
    // style for the current position as it doesn't make sense for SetValue())
    const wxTextAttr& style = GetDefaultStyle();
    wxFontEncoding enc = style.HasFontEncoding() ? style.GetFontEncoding()
                                         : wxFONTENCODING_SYSTEM;

    // fall back to the controls font if no style
    if ( enc == wxFONTENCODING_SYSTEM && m_hasFont )
        enc = GetFont().GetEncoding();

    return enc;
}

bool wxTextCtrl::IsEmpty() const
{
    if ( IsMultiLine() )
        return gtk_text_buffer_get_char_count(m_buffer) == 0;

    return wxTextEntry::IsEmpty();
}

extern "C" {
static void adjustmentChanged(GtkAdjustment* adj, GtkTextMark** mark)
{
    if (*mark)
    {
        const double value = gtk_adjustment_get_value(adj);
        const double upper = gtk_adjustment_get_upper(adj);
        const double page_size = gtk_adjustment_get_page_size(adj);
        if (value < upper - page_size)
        {
            GtkTextIter iter;
            GtkTextBuffer* buffer = gtk_text_mark_get_buffer(*mark);
            gtk_text_buffer_get_iter_at_mark(buffer, &iter, *mark);
            if (gtk_text_iter_is_end(&iter))
            {
                // Keep position at bottom as scrollbar is updated during layout
                gtk_adjustment_set_value(adj, upper - page_size);
            }
        }
    }
}
}

void wxTextCtrl::GTKAfterLayout()
{
    g_signal_handlers_disconnect_by_func(
        gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(m_widget)),
        (void*)adjustmentChanged, &m_showPositionDefer);
    m_afterLayoutId = 0;
    if (m_showPositionDefer && !IsFrozen())
    {
        gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(m_text), m_showPositionDefer);
        m_showPositionDefer = nullptr;
    }
}

extern "C" {
static gboolean afterLayout(void* data)
{
    wxGDKThreadsLock threadsLock;

    wxTextCtrl* win = static_cast<wxTextCtrl*>(data);
    win->GTKAfterLayout();

    return false;
}
}

void wxTextCtrl::WriteText( const wxString &text )
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    // Disable max length check, it shouldn't prevent the program itself from
    // making the text as long as it wants.
    const auto maxlenOrig = m_maxlen;
    m_maxlen = 0;
    wxON_BLOCK_EXIT_SET( m_maxlen, maxlenOrig );

    if ( text.empty() )
    {
        // We don't need to actually do anything, but we still need to generate
        // an event expected from this call.
        SendTextUpdatedEvent(this);
        return;
    }

    // we're changing the text programmatically
    DontMarkDirtyOnNextChange();
    // make sure marking is re-enabled even if events are suppressed
    wxON_BLOCK_EXIT_SET(m_dontMarkDirty, false);

    // Inserting new text into the control below will emit insert-text signal
    // which assumes that if m_imKeyEvent is set, it is called in response to
    // this key press -- which is not the case here (but m_imKeyEvent might
    // still be set e.g. because we're called from a menu event handler
    // triggered by a keyboard accelerator), so reset m_imKeyEvent temporarily.
    GdkEventKey* const imKeyEvent_save = m_imKeyEvent;
    m_imKeyEvent = nullptr;
    wxON_BLOCK_EXIT_SET(m_imKeyEvent, imKeyEvent_save);

    if ( !IsMultiLine() )
    {
        wxTextEntry::WriteText(text);
        return;
    }

    const wxScopedCharBuffer buffer(text.utf8_str());

    // First remove the selection if there is one
    gtk_text_buffer_delete_selection(m_buffer, false, true);

    // Insert the text
    GtkTextMark* insertMark = gtk_text_buffer_get_insert(m_buffer);
    GtkTextIter iter;
    gtk_text_buffer_get_iter_at_mark(m_buffer, &iter, insertMark);

    const bool insertIsEnd = gtk_text_iter_is_end(&iter) != 0;

    gtk_text_buffer_insert( m_buffer, &iter, buffer, buffer.length() );

    GtkAdjustment* adj = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(m_widget));

    // Scroll to cursor, if it is at the end and scrollbar thumb is at the bottom
    if (insertIsEnd)
    {
        const double value = gtk_adjustment_get_value(adj);
        const double upper = gtk_adjustment_get_upper(adj);
        const double page_size = gtk_adjustment_get_page_size(adj);
        if (wxIsSameDouble(value, upper - page_size))
        {
            if (!IsFrozen())
                gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(m_text), insertMark);

            // GtkTextView's incremental background layout makes scrolling
            // to end unreliable until the layout has been completed
            m_showPositionDefer = insertMark;
        }
    }
    if (m_afterLayoutId == 0)
    {
        g_signal_connect(adj, "changed", G_CALLBACK(adjustmentChanged), &m_showPositionDefer);
        m_afterLayoutId =
            g_idle_add_full(GTK_TEXT_VIEW_PRIORITY_VALIDATE + 1, afterLayout, this, nullptr);
    }
}

wxString wxTextCtrl::GetLineText( long lineNo ) const
{
    wxString result;
    if ( IsMultiLine() )
    {
        GtkTextIter line;
        gtk_text_buffer_get_iter_at_line(m_buffer,&line,lineNo);

        GtkTextIter end = line;
        // avoid skipping to the next line end if this one is empty
        if ( !gtk_text_iter_ends_line(&line) )
            gtk_text_iter_forward_to_line_end(&end);

        wxGtkString text(gtk_text_buffer_get_text(m_buffer, &line, &end, true));
        result = wxString::FromUTF8Unchecked(text);
    }
    else
    {
        if (lineNo == 0)
            result = GetValue();
    }
    return result;
}

void wxTextCtrl::OnDropFiles( wxDropFilesEvent &WXUNUSED(event) )
{
  /* If you implement this, don't forget to update the documentation!
   * (file docs/latex/wx/text.tex) */
    wxFAIL_MSG( wxT("wxTextCtrl::OnDropFiles not implemented") );
}

bool wxTextCtrl::PositionToXY(long pos, long *x, long *y ) const
{
    if ( IsMultiLine() )
    {
        GtkTextIter iter;

        if (pos > GetLastPosition())
            return false;

        gtk_text_buffer_get_iter_at_offset(m_buffer, &iter, pos);

        if ( y )
            *y = gtk_text_iter_get_line(&iter);
        if ( x )
            *x = gtk_text_iter_get_line_offset(&iter);
    }
    else // single line control
    {
        if (pos <= GTKGetEntryTextLength(GTK_ENTRY(m_text)))
        {
            if ( y )
                *y = 0;
            if ( x )
                *x = pos;
        }
        else
        {
            // index out of bounds
            return false;
        }
    }

    return true;
}

long wxTextCtrl::XYToPosition(long x, long y ) const
{
    if ( IsSingleLine() )
    {
        if ( y != 0 || x > GTKGetEntryTextLength(GTK_ENTRY(m_text)) )
            return -1;

        return x;
    }

    const gint numLines = gtk_text_buffer_get_line_count (m_buffer);

    GtkTextIter iter;
    if (y >= numLines)
        return -1;

    gtk_text_buffer_get_iter_at_line(m_buffer, &iter, y);

    const gint lineLength = gtk_text_iter_get_chars_in_line (&iter);
    if (x > lineLength)
    {
        // This coordinate is always invalid.
        return -1;
    }

    if (x == lineLength)
    {
        // In this case the coordinate is considered to be valid by wx if this
        // is the last line, as it corresponds to the last position beyond the
        // last character of the text, and invalid otherwise.
        if (y != numLines - 1)
            return -1;
    }

    return gtk_text_iter_get_offset(&iter) + x;
}

int wxTextCtrl::GetLineLength(long lineNo) const
{
    if ( IsMultiLine() )
    {
        int last_line = gtk_text_buffer_get_line_count( m_buffer ) - 1;
        if (lineNo > last_line)
            return -1;

        GtkTextIter iter;
        gtk_text_buffer_get_iter_at_line(m_buffer, &iter, lineNo);
        // get_chars_in_line return includes paragraph delimiters, so need to subtract 1 IF it is not the last line
        return gtk_text_iter_get_chars_in_line(&iter) - ((lineNo == last_line) ? 0 : 1);
    }
    else
    {
        wxString str = GetLineText (lineNo);
        return (int) str.length();
    }
}

wxPoint wxTextCtrl::DoPositionToCoords(long pos) const
{
    if ( !IsMultiLine() )
    {
        // Single line text entry (GtkTextEntry) doesn't have support for
        // getting the coordinates for the given offset. Perhaps we could
        // find them ourselves by using GetTextExtent() but for now just leave
        // it unimplemented, this function is more useful for multiline
        // controls anyhow.
        return wxDefaultPosition;
    }

    // Window coordinates for the given position is calculated by getting
    // the buffer coordinates and converting them to window coordinates.
    GtkTextView *textview = GTK_TEXT_VIEW(m_text);

    GtkTextIter iter;
    gtk_text_buffer_get_iter_at_offset(m_buffer, &iter, pos);

    GdkRectangle bufferCoords;
    gtk_text_view_get_iter_location(textview, &iter, &bufferCoords);

    gint winCoordX = 0,
         winCoordY = 0;
    gtk_text_view_buffer_to_window_coords(textview, GTK_TEXT_WINDOW_WIDGET,
                                          bufferCoords.x, bufferCoords.y,
                                          &winCoordX, &winCoordY);

    return wxPoint(winCoordX, winCoordY);
}

int wxTextCtrl::GetNumberOfLines() const
{
    if ( IsMultiLine() )
    {
        return gtk_text_buffer_get_line_count( m_buffer );
    }
    else // single line
    {
        return 1;
    }
}

void wxTextCtrl::SetInsertionPoint( long pos )
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    if ( IsMultiLine() )
    {
        GtkTextIter iter;
        gtk_text_buffer_get_iter_at_offset( m_buffer, &iter, pos );
        gtk_text_buffer_place_cursor( m_buffer, &iter );
        GtkTextMark* mark = gtk_text_buffer_get_insert(m_buffer);
        if (IsFrozen())
            // defer until Thaw, text view is not using m_buffer now
            m_showPositionDefer = mark;
        else
        {
            gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(m_text), mark);
            if (m_afterLayoutId)
                m_showPositionDefer = mark;
        }
    }
    else // single line
    {
        wxTextEntry::SetInsertionPoint(pos);
    }
}

void wxTextCtrl::SetEditable( bool editable )
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    if ( IsMultiLine() )
    {
        gtk_text_view_set_editable( GTK_TEXT_VIEW(m_text), editable );
    }
    else // single line
    {
        wxTextEntry::SetEditable(editable);
    }
}

void wxTextCtrl::DoEnable(bool enable)
{
    if ( !m_text )
        return;

    wxTextCtrlBase::DoEnable(enable);

    gtk_widget_set_sensitive( m_text, enable );
}

void wxTextCtrl::MarkDirty()
{
    m_modified = true;
}

void wxTextCtrl::DiscardEdits()
{
    m_modified = false;
}

void wxTextCtrl::GTKOnTextChanged()
{
    if ( IgnoreTextUpdate() )
        return;

    if ( MarkDirtyOnChange() )
        MarkDirty();

    SendTextUpdatedEvent();
}

// ----------------------------------------------------------------------------
// event handling
// ----------------------------------------------------------------------------

bool wxTextCtrl::IgnoreTextUpdate()
{
    if ( m_countUpdatesToIgnore > 0 )
    {
        m_countUpdatesToIgnore--;

        return true;
    }

    return false;
}

bool wxTextCtrl::MarkDirtyOnChange()
{
    if ( m_dontMarkDirty )
    {
        m_dontMarkDirty = false;

        return false;
    }

    return true;
}

void wxTextCtrl::SetSelection( long from, long to )
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    if ( IsMultiLine() )
    {
        if (from == -1 && to == -1)
        {
            from = 0;
            to = GetValue().length();
        }

        GtkTextIter fromi, toi;
        gtk_text_buffer_get_iter_at_offset( m_buffer, &fromi, from );
        gtk_text_buffer_get_iter_at_offset( m_buffer, &toi, to );

        gtk_text_buffer_select_range( m_buffer, &fromi, &toi );
    }
    else // single line
    {
        wxTextEntry::SetSelection(from, to);
    }
}

void wxTextCtrl::ShowPosition( long pos )
{
    if (IsMultiLine())
    {
        GtkTextIter iter;
        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_showPositionDefer = mark;
        else
        {
            gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(m_text), mark);
            if (m_afterLayoutId)
                m_showPositionDefer = mark;
        }
    }
    else // single line
    {   // This function not only shows character at required position
        // but also places the cursor at this position.
        gtk_editable_set_position(GTK_EDITABLE(m_text), pos);
    }
}

wxTextCtrlHitTestResult
wxTextCtrl::HitTest(const wxPoint& pt, long *pos) const
{
    if ( !IsMultiLine() )
    {
        // These variables will contain the position inside PangoLayout.
        int x = pt.x,
            y = pt.y;

        // Get the offsets of PangoLayout inside the control.
        //
        // Note that contrary to what GTK+ documentation implies, the
        // horizontal offset already accounts for scrolling, i.e. it will be
        // negative if text is scrolled.
        gint ofsX = 0,
             ofsY = 0;
        gtk_entry_get_layout_offsets(GTK_ENTRY(m_text), &ofsX, &ofsY);

        x -= ofsX;
        y -= ofsY;

        // And scale the coordinates for Pango.
        x *= PANGO_SCALE;
        y *= PANGO_SCALE;

        PangoLayout* const layout = gtk_entry_get_layout(GTK_ENTRY(m_text));

        int idx = -1,
            ofs = 0;
        if ( !pango_layout_xy_to_index(layout, x, y, &idx, &ofs) )
        {
            // Try to guess why did it fail.
            if ( x < 0 || y < 0 )
            {
                if ( pos )
                    *pos = 0;

                return wxTE_HT_BEFORE;
            }
            else
            {
                if ( pos )
                    *pos = wxTextEntry::GetLastPosition();

                return wxTE_HT_BEYOND;
            }
        }

        if ( pos )
            *pos = idx;

        return wxTE_HT_ON_TEXT;
    }

    int x, y;
    gtk_text_view_window_to_buffer_coords
    (
        GTK_TEXT_VIEW(m_text),
        GTK_TEXT_WINDOW_TEXT,
        pt.x, pt.y,
        &x, &y
    );

    GtkTextIter iter;
    gtk_text_view_get_iter_at_location(GTK_TEXT_VIEW(m_text), &iter, x, y);
    if ( pos )
        *pos = gtk_text_iter_get_offset(&iter);

    return wxTE_HT_ON_TEXT;
}

long wxTextCtrl::GetInsertionPoint() const
{
    wxCHECK_MSG( m_text != nullptr, 0, wxT("invalid text ctrl") );

    if ( IsMultiLine() )
    {
        // There is no direct accessor for the cursor, but
        // internally, the cursor is the "mark" called
        // "insert" in the text view's btree structure.

        GtkTextMark *mark = gtk_text_buffer_get_insert( m_buffer );
        GtkTextIter cursor;
        gtk_text_buffer_get_iter_at_mark( m_buffer, &cursor, mark );

        return gtk_text_iter_get_offset( &cursor );
    }
    else
    {
        return wxTextEntry::GetInsertionPoint();
    }
}

wxTextPos wxTextCtrl::GetLastPosition() const
{
    wxCHECK_MSG( m_text != nullptr, 0, wxT("invalid text ctrl") );

    int pos = 0;

    if ( IsMultiLine() )
    {
        GtkTextIter end;
        gtk_text_buffer_get_end_iter( m_buffer, &end );

        pos = gtk_text_iter_get_offset( &end );
    }
    else // single line
    {
        pos = wxTextEntry::GetLastPosition();
    }

    return (long)pos;
}

void wxTextCtrl::Remove( long from, long to )
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    if ( IsMultiLine() )
    {
        GtkTextIter fromi, toi;
        gtk_text_buffer_get_iter_at_offset( m_buffer, &fromi, from );
        gtk_text_buffer_get_iter_at_offset( m_buffer, &toi, to );

        gtk_text_buffer_delete( m_buffer, &fromi, &toi );
    }
    else // single line
    {
        wxTextEntry::Remove(from, to);
    }
}

void wxTextCtrl::Cut()
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    if ( IsMultiLine() )
        g_signal_emit_by_name (m_text, "cut-clipboard");
    else
        wxTextEntry::Cut();
}

void wxTextCtrl::Copy()
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    if ( IsMultiLine() )
        g_signal_emit_by_name (m_text, "copy-clipboard");
    else
        wxTextEntry::Copy();
}

void wxTextCtrl::Paste()
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    if ( IsMultiLine() )
        g_signal_emit_by_name (m_text, "paste-clipboard");
    else
        wxTextEntry::Paste();
}

// If the return values from and to are the same, there is no
// selection.
void wxTextCtrl::GetSelection(long* fromOut, long* toOut) const
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    if ( !IsMultiLine() )
    {
        wxTextEntry::GetSelection(fromOut, toOut);
        return;
    }

    gint from, to;

    GtkTextIter ifrom, ito;
    if ( gtk_text_buffer_get_selection_bounds(m_buffer, &ifrom, &ito) )
    {
        from = gtk_text_iter_get_offset(&ifrom);
        to = gtk_text_iter_get_offset(&ito);

        if ( from > to )
        {
            // exchange them to be compatible with wxMSW
            gint tmp = from;
            from = to;
            to = tmp;
        }
    }
    else // no selection
    {
        from =
        to = GetInsertionPoint();
    }

    if ( fromOut )
        *fromOut = from;
    if ( toOut )
        *toOut = to;
}


bool wxTextCtrl::IsEditable() const
{
    wxCHECK_MSG( m_text != nullptr, false, wxT("invalid text ctrl") );

    if ( IsMultiLine() )
    {
        return gtk_text_view_get_editable(GTK_TEXT_VIEW(m_text)) != 0;
    }
    else
    {
        return wxTextEntry::IsEditable();
    }
}

bool wxTextCtrl::IsModified() const
{
    return m_modified;
}

void wxTextCtrl::OnChar( wxKeyEvent &key_event )
{
    wxCHECK_RET( m_text != nullptr, wxT("invalid text ctrl") );

    if ( key_event.GetKeyCode() == WXK_RETURN )
    {
        if ( HasFlag(wxTE_PROCESS_ENTER) )
        {
            wxCommandEvent event(wxEVT_TEXT_ENTER, m_windowId);
            event.SetEventObject(this);
            event.SetString(GetValue());
            if ( HandleWindowEvent(event) )
                return;

            // We disable built-in default button activation when
            // wxTE_PROCESS_ENTER is used, but we still should activate it
            // if the event wasn't handled, so do it from here.
            if ( ClickDefaultButtonIfPossible() )
                return;
        }
    }

    key_event.Skip();
}

GtkWidget* wxTextCtrl::GetConnectWidget() const
{
    return GTK_WIDGET(m_text);
}

GdkWindow *wxTextCtrl::GTKGetWindow(wxArrayGdkWindows& WXUNUSED(windows)) const
{
    if ( IsMultiLine() )
    {
        return gtk_text_view_get_window(GTK_TEXT_VIEW(m_text),
                                        GTK_TEXT_WINDOW_TEXT );
    }
    else
    {
#ifdef __WXGTK3__
        return GTKFindWindow(m_text);
#else
        return gtk_entry_get_text_window(GTK_ENTRY(m_text));
#endif
    }
}

// the font will change for subsequent text insertiongs
bool wxTextCtrl::SetFont( const wxFont &font )
{
    wxCHECK_MSG( m_text != nullptr, false, wxT("invalid text ctrl") );

    if ( !wxTextCtrlBase::SetFont(font) )
    {
        // font didn't change, nothing to do
        return false;
    }

    if ( IsMultiLine() )
    {
        SetUpdateFont(true);

        m_defaultStyle.SetFont(font);

        ChangeFontGlobally();
    }

    return true;
}

void wxTextCtrl::ChangeFontGlobally()
{
    // this method is very inefficient and hence should be called as rarely as
    // possible!
    //
    // TODO: it can be implemented much more efficiently for GTK2
    wxASSERT_MSG( IsMultiLine(),
                  wxT("shouldn't be called for single line controls") );

    wxString value = GetValue();
    if ( !value.empty() )
    {
        SetUpdateFont(false);

        Clear();
        AppendText(value);
    }
}

bool wxTextCtrl::SetForegroundColour(const wxColour& colour)
{
    if ( !wxControl::SetForegroundColour(colour) )
        return false;

    // update default fg colour too
    m_defaultStyle.SetTextColour(colour);

    return true;
}

bool wxTextCtrl::SetBackgroundColour( const wxColour &colour )
{
    wxCHECK_MSG( m_text != nullptr, false, wxT("invalid text ctrl") );

    if ( !wxControl::SetBackgroundColour( colour ) )
        return false;

    if (!m_backgroundColour.IsOk())
        return false;

    // change active background color too
    m_defaultStyle.SetBackgroundColour( colour );

    return true;
}

bool wxTextCtrl::SetStyle( long start, long end, const wxTextAttr& style )
{
    if ( IsMultiLine() )
    {
        if ( style.IsDefault() )
        {
            // nothing to do
            return true;
        }

        gint l = gtk_text_buffer_get_char_count( m_buffer );

        wxCHECK_MSG( start >= 0 && end <= l, false,
                     wxT("invalid range in wxTextCtrl::SetStyle") );

        GtkTextIter starti, endi;
        gtk_text_buffer_get_iter_at_offset( m_buffer, &starti, start );
        gtk_text_buffer_get_iter_at_offset( m_buffer, &endi, end );

        wxGtkTextApplyTagsFromAttr( m_widget, m_buffer, style, &starti, &endi );

        return true;
    }
    //else: single line text controls don't support styles

    return false;
}

bool wxTextCtrl::GetStyle(long position, wxTextAttr& style)
{
    if ( !IsMultiLine() )
    {
        // no styles for GtkEntry
        return false;
    }

    gint l = gtk_text_buffer_get_char_count( m_buffer );

    wxCHECK_MSG( position >= 0 && position <= l, false,
                 wxT("invalid range in wxTextCtrl::GetStyle") );

    GtkTextIter positioni;
    gtk_text_buffer_get_iter_at_offset(m_buffer, &positioni, position);

    // Obtain a copy of the default attributes
    GtkTextAttributes * const
        pattr = gtk_text_view_get_default_attributes(GTK_TEXT_VIEW(m_text));
    wxON_BLOCK_EXIT1(gtk_text_attributes_unref, pattr);

    // And query GTK for the attributes at the given position using it as base
    if ( !gtk_text_iter_get_attributes(&positioni, pattr) )
    {
        style = m_defaultStyle;
    }
    else // have custom attributes
    {
#ifdef __WXGTK3__
        if (GdkRGBA* rgba = pattr->appearance.rgba[0])
            style.SetBackgroundColour(*rgba);
        if (GdkRGBA* rgba = pattr->appearance.rgba[1])
            style.SetTextColour(*rgba);
#else
        style.SetBackgroundColour(pattr->appearance.bg_color);
        style.SetTextColour(pattr->appearance.fg_color);
#endif

        const wxGtkString
            pangoFontString(pango_font_description_to_string(pattr->font));

        wxFont font;
        if ( font.SetNativeFontInfo(wxString(pangoFontString)) )
            style.SetFont(font);

        wxTextAttrUnderlineType underlineType = wxTEXT_ATTR_UNDERLINE_NONE;
        switch ( pattr->appearance.underline )
        {
            case PANGO_UNDERLINE_SINGLE:
                underlineType = wxTEXT_ATTR_UNDERLINE_SOLID;
                break;
            case PANGO_UNDERLINE_DOUBLE:
                underlineType = wxTEXT_ATTR_UNDERLINE_DOUBLE;
                break;
            case PANGO_UNDERLINE_ERROR:
                underlineType = wxTEXT_ATTR_UNDERLINE_SPECIAL;
                break;
            default:
                underlineType = wxTEXT_ATTR_UNDERLINE_NONE;
                break;
        }

        wxColour underlineColour = wxNullColour;
#ifdef __WXGTK3__
        if ( wx_is_at_least_gtk3(16) )
        {
            GSList* tags = gtk_text_iter_get_tags(&positioni);
            for ( GSList* tagp = tags; tagp != nullptr; tagp = tagp->next )
            {
                GtkTextTag* tag = static_cast<GtkTextTag*>(tagp->data);
                gboolean underlineSet = FALSE;
                g_object_get(tag, "underline-rgba-set", &underlineSet, nullptr);
                if ( underlineSet )
                {
                    GdkRGBA* gdkColour = nullptr;
                    g_object_get(tag, "underline-rgba", &gdkColour, nullptr);
                    if ( gdkColour )
                        underlineColour = wxColour(*gdkColour);
                    gdk_rgba_free(gdkColour);
                    break;
                }
            }
            if ( tags )
                g_slist_free(tags);
        }
#endif

        if ( underlineType != wxTEXT_ATTR_UNDERLINE_NONE )
            style.SetFontUnderlined(underlineType, underlineColour);

        if ( pattr->appearance.strikethrough )
            style.SetFontStrikethrough(true);

        // TODO: set alignment, tabs and indents
    }

    return true;
}

#ifdef __WXGTK3__
bool wxTextCtrl::GTKSetPangoMarkup(const wxString& str)
{
    wxCHECK_MSG(IsMultiLine(), false,
                "Pango markup only supported in multiline controls");

#if GTK_CHECK_VERSION(3,16,0)
    if (gtk_check_version(3,16,0) == nullptr)
    {
        // multiple events may get fired while editing text, so block those
        {
            EventsSuppressor noevents(this);
            // clear current content
            GtkTextIter start, end;
            gtk_text_buffer_get_bounds(m_buffer, &start, &end);
            gtk_text_buffer_delete(m_buffer, &start, &end);

            gtk_text_buffer_insert_markup(m_buffer, &start, str.utf8_str(), -1);
        }
        SendTextUpdatedEvent(GetEditableWindow());

        return true;
    }
#endif // GTK 3.16

    return false;
}
wxTextSearchResult wxTextCtrl::SearchText(const wxTextSearch& search) const
{
    if ( !IsMultiLine() )
    {
        return wxTextSearchResult{};
    }

    int flags = GTK_TEXT_SEARCH_TEXT_ONLY;
    if ( !search.m_matchCase )
        flags |= GTK_TEXT_SEARCH_CASE_INSENSITIVE;

    // get the beginning and end of text buffer
    GtkTextIter textStart, textEnd;
    gtk_text_buffer_get_start_iter(m_buffer, &textStart);
    gtk_text_buffer_get_end_iter(m_buffer, &textEnd);

    const bool forward = search.m_direction == wxTextSearch::Direction::Down;

    // start search at the start or at the end depending on the direction
    GtkTextIter searchStart = forward ? textStart : textEnd;

    // but user-provided position overrides the default starting position
    if ( search.m_startingPosition != -1 )
    {
        gtk_text_buffer_get_iter_at_offset(m_buffer, &searchStart,
                                           static_cast<gint>(search.m_startingPosition));
    }

    // the match results
    GtkTextIter selectionStart, selectionEnd;

    const auto searchFunc = forward ? gtk_text_iter_forward_search
                                    : gtk_text_iter_backward_search;
    for ( ;; )
    {
        if ( !searchFunc
              (
                &searchStart,
                search.m_searchValue.utf8_str(),
                static_cast<GtkTextSearchFlags>(flags),
                &selectionStart,
                &selectionEnd,
                nullptr // no limit
              ) )
        {
            // If we haven't found anything at all, we're done.
            return wxTextSearchResult{};
        }

        // But if we did find something, we may need to check whether it was
        // a whole word.
        if ( !search.m_wholeWord )
            break;

        // Check if this is a whole-word match.
        if ( gtk_text_iter_starts_word(&selectionStart) &&
                gtk_text_iter_ends_word(&selectionEnd) )
            break;

        // Not a whole-word match, keep searching for the next match, maybe it
        // will be a whole-word one.
        searchStart = selectionEnd;
    }

    return wxTextSearchResult{ gtk_text_iter_get_offset(&selectionStart),
                               gtk_text_iter_get_offset(&selectionEnd) };
}

#endif // __WXGTK3__

void wxTextCtrl::DoApplyWidgetStyle(GtkRcStyle *style)
{
    GTKApplyStyle(m_text, style);
}

void wxTextCtrl::OnCut(wxCommandEvent& WXUNUSED(event))
{
    Cut();
}

void wxTextCtrl::OnCopy(wxCommandEvent& WXUNUSED(event))
{
    Copy();
}

void wxTextCtrl::OnPaste(wxCommandEvent& WXUNUSED(event))
{
    Paste();
}

void wxTextCtrl::OnUndo(wxCommandEvent& WXUNUSED(event))
{
    Undo();
}

void wxTextCtrl::OnRedo(wxCommandEvent& WXUNUSED(event))
{
    Redo();
}

void wxTextCtrl::OnUpdateCut(wxUpdateUIEvent& event)
{
    event.Enable( CanCut() );
}

void wxTextCtrl::OnUpdateCopy(wxUpdateUIEvent& event)
{
    event.Enable( CanCopy() );
}

void wxTextCtrl::OnUpdatePaste(wxUpdateUIEvent& event)
{
    event.Enable( CanPaste() );
}

void wxTextCtrl::OnUpdateUndo(wxUpdateUIEvent& event)
{
    event.Enable( CanUndo() );
}

void wxTextCtrl::OnUpdateRedo(wxUpdateUIEvent& event)
{
    event.Enable( CanRedo() );
}

wxSize wxTextCtrl::DoGetBestSize() const
{
    return DoGetSizeFromTextSize(80);
}

wxSize wxTextCtrl::DoGetSizeFromTextSize(int xlen, int ylen) const
{
    wxASSERT_MSG( m_widget, wxS("GetSizeFromTextSize called before creation") );

    int cHeight = GetCharHeight();
    wxSize tsize(xlen, cHeight);

    if ( IsSingleLine() )
    {
        // Default height
        tsize.y = GTKGetPreferredSize(m_widget).y;

        // Add padding + border size
        tsize.x += GTKGetEntryMargins(GetEntry()).x;
    }

    //multiline
    else
    {
        // height
        if ( ylen <= 0 )
            tsize.y = 1 + cHeight * wxMax(wxMin(GetNumberOfLines(), 10), 2);

        GtkRequisition req;
        gtk_widget_get_preferred_size(m_widget, &req, nullptr);
        tsize.IncTo(wxSize(req.width, req.height));
    }

    // We should always use at least the specified height if it's valid.
    if ( ylen > tsize.y )
        tsize.y = ylen;

    return tsize;
}


// ----------------------------------------------------------------------------
// freeze/thaw
// ----------------------------------------------------------------------------

void wxTextCtrl::DoFreeze()
{
    wxCHECK_RET(m_text != nullptr, wxT("invalid text ctrl"));

    GTKFreezeWidget(m_text);
    if (m_widget != m_text)
        GTKFreezeWidget(m_widget);

    if ( HasFlag(wxTE_MULTILINE) )
    {
        // removing buffer dramatically speeds up insertion:
        g_object_ref(m_buffer);
        GtkTextBuffer* buf_new = gtk_text_buffer_new(nullptr);
        gtk_text_view_set_buffer(GTK_TEXT_VIEW(m_text), buf_new);
        // gtk_text_view_set_buffer adds its own reference
        g_object_unref(buf_new);
        // These marks should be deleted when the buffer is changed,
        // but they are not (in GTK+ up to at least 3.0.1).
        // Otherwise these anonymous marks start to build up in the buffer,
        // and Freeze takes longer and longer each time it is called.
        if (m_anonymousMarkList)
        {
            for (GSList* item = m_anonymousMarkList; item; item = item->next)
            {
                GtkTextMark* mark = static_cast<GtkTextMark*>(item->data);
                if (GTK_IS_TEXT_MARK(mark) && !gtk_text_mark_get_deleted(mark))
                    gtk_text_buffer_delete_mark(m_buffer, mark);
            }
            g_slist_free_full(m_anonymousMarkList, g_object_unref);
            m_anonymousMarkList = nullptr;
        }
    }
}

void wxTextCtrl::DoThaw()
{
    if ( HasFlag(wxTE_MULTILINE) )
    {
        // reattach buffer:
        gulong sig_id = g_signal_connect(m_buffer, "mark_set", G_CALLBACK(mark_set), &m_anonymousMarkList);
        gtk_text_view_set_buffer(GTK_TEXT_VIEW(m_text), m_buffer);
        g_object_unref(m_buffer);
        g_signal_handler_disconnect(m_buffer, sig_id);

        if (m_showPositionDefer)
        {
            gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(m_text), m_showPositionDefer);
            if (m_afterLayoutId == 0)
                m_showPositionDefer = nullptr;
        }
    }

    GTKThawWidget(m_text);
    if (m_widget != m_text)
        GTKThawWidget(m_widget);
}

// ----------------------------------------------------------------------------
// wxTextUrlEvent passing if style & wxTE_AUTO_URL
// ----------------------------------------------------------------------------

// FIXME: when dragging on a link the sample gets an "Unknown event".
// This might be an excessive event from us or a buggy wxMouseEvent::Moving() or
// a buggy sample, or something else
void wxTextCtrl::OnUrlMouseEvent(wxMouseEvent& event)
{
    event.Skip();
    if( !HasFlag(wxTE_AUTO_URL) )
        return;

    gint x, y;
    GtkTextIter start, end;
    GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(m_buffer),
                                                "wxUrl");

    gtk_text_view_window_to_buffer_coords(GTK_TEXT_VIEW(m_text), GTK_TEXT_WINDOW_WIDGET,
                                          event.GetX(), event.GetY(), &x, &y);

    gtk_text_view_get_iter_at_location(GTK_TEXT_VIEW(m_text), &end, x, y);
    if (!gtk_text_iter_has_tag(&end, tag))
    {
        SetCursor(wxCursor());
        return;
    }

    SetCursor(wxCursor(wxCURSOR_HAND));

    start = end;
    if (!gtk_text_iter_starts_tag(&start, tag))
        gtk_text_iter_backward_to_tag_toggle(&start, tag);
    if(!gtk_text_iter_ends_tag(&end, tag))
        gtk_text_iter_forward_to_tag_toggle(&end, tag);

    // Native context menu is probably not desired on an URL.
    // Consider making this dependent on ProcessEvent(wxTextUrlEvent) return value
    if(event.GetEventType() == wxEVT_RIGHT_DOWN)
        event.Skip(false);

    wxTextUrlEvent url_event(m_windowId, event,
                             gtk_text_iter_get_offset(&start),
                             gtk_text_iter_get_offset(&end));

    InitCommandEvent(url_event);
    // Is that a good idea? Seems not (pleasure with gtk_text_view_start_selection_drag)
    //event.Skip(!HandleWindowEvent(url_event));
    HandleWindowEvent(url_event);
}

bool wxTextCtrl::GTKProcessEvent(wxEvent& event) const
{
    bool rc = wxTextCtrlBase::GTKProcessEvent(event);

    // GtkTextView starts a drag operation when left mouse button is pressed
    // and ends it when it is released and if it doesn't get the release event
    // the next click on a control results in an assertion failure inside
    // gtk_text_view_start_selection_drag() which simply *kills* the program
    // without anything we can do about it, so always let GTK+ have this event
    return rc && (IsSingleLine() || event.GetEventType() != wxEVT_LEFT_UP);
}

// static
wxVisualAttributes
wxTextCtrl::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
{
    return GetDefaultAttributesFromGTKWidget(gtk_entry_new(), true);
}

#endif // wxUSE_TEXTCTRL
