Implement tooltips for the Go/Stop button in Linux.

chrome/browser/gtk/go_button_gtk.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/browser/gtk/go_button_gtk.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "chrome/app/chrome_dll_resource.h"
 #include "chrome/browser/browser.h"
+#include "chrome/browser/gtk/location_bar_view_gtk.h"
+#include "chrome/common/l10n_util.h"
+#include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 
-GoButtonGtk::GoButtonGtk(Browser* browser)
-    : browser_(browser),
+GoButtonGtk::GoButtonGtk(LocationBarViewGtk* location_bar, Browser* browser)
+    : location_bar_(location_bar),
+      browser_(browser),
       button_delay_(0),
       stop_timer_(this),
       intended_mode_(MODE_GO),
       visible_mode_(MODE_GO),
       state_(BS_NORMAL),
       go_(IDR_GO, IDR_GO_P, IDR_GO_H, 0),
       stop_(IDR_STOP, IDR_STOP_P, IDR_STOP_H, 0),
       widget_(gtk_button_new()) {
   gtk_widget_set_size_request(widget_.get(),
                               gdk_pixbuf_get_width(go_.pixbufs(0)),
                               gdk_pixbuf_get_height(go_.pixbufs(0)));
 
   gtk_widget_set_app_paintable(widget_.get(), TRUE);
   // We effectively double-buffer by virtue of having only one image...
   gtk_widget_set_double_buffered(widget_.get(), FALSE);
 
   g_signal_connect(G_OBJECT(widget_.get()), "expose-event",
                    G_CALLBACK(OnExpose), this);
   g_signal_connect(G_OBJECT(widget_.get()), "enter",
                    G_CALLBACK(OnEnter), this);
   g_signal_connect(G_OBJECT(widget_.get()), "leave",
                    G_CALLBACK(OnLeave), this);
   g_signal_connect(G_OBJECT(widget_.get()), "clicked",
                    G_CALLBACK(OnClicked), this);
   GTK_WIDGET_UNSET_FLAGS(widget_.get(), GTK_CAN_FOCUS);
 
-  // TODO(willchan): Implement tooltips.
-  gtk_widget_set_tooltip_text(widget_.get(), "Implement toggleable tooltips");
+  SetTooltip();
 }
 
 GoButtonGtk::~GoButtonGtk() {
   widget_.Destroy();
 }
 
 void GoButtonGtk::ChangeMode(Mode mode) {
   if (mode != visible_mode_) {
     gtk_widget_queue_draw(widget_.get());
+    visible_mode_ = mode;
+    SetTooltip();
   }
   stop_timer_.RevokeAll();
   intended_mode_ = mode;
-  visible_mode_ = mode;
 }
 
 void GoButtonGtk::ScheduleChangeMode(Mode mode) {
   if (mode == MODE_STOP) {
     // If we still have a timer running, we can't yet change to a stop sign,
     // so we'll queue up the change for when the timer expires or for when
     // the mouse exits the button.
     if (!stop_timer_.empty() && state() == BS_HOT) {
       intended_mode_ = MODE_STOP;
     } else {
@@ skipping 82 matching lines @@
     // to MODE_STOP here as we want to wait for the browser to tell
     // us that it has started loading (and this may occur only after
     // some delay).
     MessageLoop::current()->PostDelayedTask(FROM_HERE,
                                             button->CreateButtonTimerTask(),
                                             button->button_delay_);
   }
 
   return TRUE;
 }
+
+void GoButtonGtk::SetTooltip() {
+  if (visible_mode_ == MODE_GO) {
+    // |location_bar_| can be NULL in tests.
+    std::wstring current_text(
+        location_bar_ ?  location_bar_->location_entry()->GetText() :
+        L"");
+    if (l10n_util::GetTextDirection() == l10n_util::RIGHT_TO_LEFT) {
+      l10n_util::WrapStringWithLTRFormatting(&current_text);
+    }
+
+    // TODO(pkasting): http://b/868940 Use the right strings at the right
+    // times by asking the autocomplete system what to do.  Don't hardcode
+    // "Google" as the search provider name.
+    gtk_widget_set_tooltip_text(
+        widget_.get(),
+        true ? l10n_util::GetStringFUTF8(
+            IDS_TOOLTIP_GO_SITE, WideToUTF16(current_text)).c_str() :
+        l10n_util::GetStringFUTF8(IDS_TOOLTIP_GO_SEARCH, UTF8ToUTF16("Google"),
+                                  WideToUTF16(current_text)).c_str());
+  } else {
+    gtk_widget_set_tooltip_text(
+        widget_.get(), l10n_util::GetStringUTF8(IDS_TOOLTIP_STOP).c_str());
+  }
+}