linux: Use gtk-cursor-blink from GtkSettings to set the caret blink interval

chrome/common/gtk_util.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/gtk_util.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdkx.h>
 
 #include <cstdarg>
@@ skipping 443 matching lines @@
   GtkWidget* content_alignment = gtk_alignment_new(0.0, 0.5, 1.0, 1.0);
   gtk_alignment_set_padding(GTK_ALIGNMENT(content_alignment), 0, 0,
                             gtk_util::kGroupIndent, 0);
   gtk_container_add(GTK_CONTAINER(content_alignment), content);
   return content_alignment;
 }
 
 void UpdateGtkFontSettings(RendererPreferences* prefs) {
   DCHECK(prefs);
 
+  // From http://library.gnome.org/devel/gtk/unstable/GtkSettings.html, this is
+  // the default value for gtk-cursor-blink-time.
+  static const gint kGtkDefaultCursorBlinkTime = 1200;
+
+  gint cursor_blink_time = kGtkDefaultCursorBlinkTime;
+  gboolean cursor_blink = TRUE;
   gint antialias = 0;
   gint hinting = 0;
   gchar* hint_style = NULL;
   gchar* rgba_style = NULL;
   g_object_get(gtk_settings_get_default(),
+               "gtk-cursor-blink-time", &cursor_blink_time,
+               "gtk-cursor-blink", &cursor_blink,
                "gtk-xft-antialias", &antialias,
                "gtk-xft-hinting", &hinting,
                "gtk-xft-hintstyle", &hint_style,
                "gtk-xft-rgba", &rgba_style,
                NULL);
 
   // Set some reasonable defaults.
   prefs->should_antialias_text = true;
   prefs->hinting = RENDERER_PREFERENCES_HINTING_SYSTEM_DEFAULT;
   prefs->subpixel_rendering =
       RENDERER_PREFERENCES_SUBPIXEL_RENDERING_SYSTEM_DEFAULT;
 
+  if (cursor_blink) {
+    // Dividing by 2*1000ms follows the WebKit GTK port and makes the blink
+    // frequency appear similar to the omnibox.  Without this the blink is too
+    // slow.
+    prefs->caret_blink_interval = cursor_blink_time / 2000.;
+  } else {
+    prefs->caret_blink_interval = 0;
+  }
+
   // g_object_get() doesn't tell us whether the properties were present or not,
   // but if they aren't (because gnome-settings-daemon isn't running), we'll get
   // NULL values for the strings.
   if (hint_style && rgba_style) {
     prefs->should_antialias_text = antialias;
 
     if (hinting == 0 || strcmp(hint_style, "hintnone") == 0) {
       prefs->hinting = RENDERER_PREFERENCES_HINTING_NONE;
     } else if (strcmp(hint_style, "hintslight") == 0) {
       prefs->hinting = RENDERER_PREFERENCES_HINTING_SLIGHT;
@@ skipping 195 matching lines @@
   g_signal_connect(container, "expose-event",
                    G_CALLBACK(PaintNoBackground), NULL);
 }
 
 void WrapLabelAtAllocationHack(GtkWidget* label) {
   g_signal_connect(label, "size-allocate",
                    G_CALLBACK(OnLabelAllocate), NULL);
 }
 
 }  // namespace gtk_util