[Mac] Omnibox keyword, keyword hint, and search hint support....

chrome/browser/cocoa/location_bar_view_mac.mm

Index: chrome/browser/cocoa/location_bar_view_mac.mm
===================================================================
--- chrome/browser/cocoa/location_bar_view_mac.mm	(revision 23951)
+++ chrome/browser/cocoa/location_bar_view_mac.mm	(working copy)
@@ -4,18 +4,47 @@
 
 #import "chrome/browser/cocoa/location_bar_view_mac.h"
 
+#include "app/l10n_util.h"
+#include "app/resource_bundle.h"
 #include "base/string_util.h"
+#include "base/sys_string_conversions.h"
 #include "chrome/app/chrome_dll_resource.h"
 #include "chrome/browser/alternate_nav_url_fetcher.h"
 #import "chrome/browser/app_controller_mac.h"
 #import "chrome/browser/autocomplete/autocomplete_edit_view_mac.h"
+#import "chrome/browser/cocoa/autocomplete_text_field.h"
+#import "chrome/browser/cocoa/autocomplete_text_field_cell.h"
 #include "chrome/browser/cocoa/event_utils.h"
 #include "chrome/browser/command_updater.h"
+#include "chrome/browser/profile.h"
+#include "chrome/browser/search_engines/template_url.h"
+#include "chrome/browser/search_engines/template_url_model.h"
+#include "grit/generated_resources.h"
+#include "grit/theme_resources.h"
+#include "skia/ext/skia_utils_mac.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 // TODO(shess): This code is mostly copied from the gtk
 // implementation.  Make sure it's all appropriate and flesh it out.
 
+namespace {
+
+// Returns the short name for a keyword.
+// TODO(shess): Copied from views/location_bar_view.cc.  Try to share
+// it.
+std::wstring GetKeywordName(Profile* profile, const std::wstring& keyword) {
+// Make sure the TemplateURL still exists.
+// TODO(sky): Once LocationBarView adds a listener to the TemplateURLModel
+// to track changes to the model, this should become a DCHECK.
+  const TemplateURL* template_url =
+      profile->GetTemplateURLModel()->GetTemplateURLForKeyword(keyword);
+  if (template_url)
+    return template_url->AdjustedShortNameForLocaleDirection();
+  return std::wstring();
+}
+
+}  // namespace
+
 LocationBarViewMac::LocationBarViewMac(AutocompleteTextField* field,
                                        CommandUpdater* command_updater,
                                        ToolbarModel* toolbar_model,
@@ -23,7 +52,9 @@
   : edit_view_(new AutocompleteEditViewMac(this, toolbar_model, profile,
                                            command_updater, field)),
       command_updater_(command_updater),
+      field_(field),
       disposition_(CURRENT_TAB),
+      profile_(profile),
       transition_(PageTransition::TYPED) {
 }
 
@@ -114,8 +145,78 @@
   }
 }
 
+void LocationBarViewMac::OnChangedImpl(AutocompleteTextField* field,
+                                       const std::wstring& keyword,
+                                       const std::wstring& short_name,
+                                       const bool is_keyword_hint,
+                                       const bool show_search_hint,
+                                       NSImage* image) {
+  AutocompleteTextFieldCell* cell = [field autocompleteTextFieldCell];
+
+  if (!keyword.empty() && !is_keyword_hint) {
+    // Keyword search mode.  The text will be like "Search Engine:".
+    // "Engine" is a parameter to be replaced by text based on the
+    // keyword.
+
+    // TODO(shess): This needs to additionally support a minimized
+    // version, to be used when the string below is too long.
+    const std::wstring keyword_text(
+        l10n_util::GetStringF(IDS_OMNIBOX_KEYWORD_TEXT, short_name));
+    [cell setKeywordString:base::SysWideToNSString(keyword_text)];
+  } else if (!keyword.empty() && is_keyword_hint) {
+    // Keyword is a hint, like "Press [Tab] to search Engine".  [Tab]
+    // is a parameter to be replaced by an image.  "Engine" is a
+    // parameter to be replaced by text based on the keyword.
+    std::vector<size_t> content_param_offsets;
+    const std::wstring keyword_hint(
+        l10n_util::GetStringF(IDS_OMNIBOX_KEYWORD_HINT,
+                              std::wstring(), short_name,
+                              &content_param_offsets));
+
+    // Should always be 2 offsets, see the comment in
+    // location_bar_view.cc after IDS_OMNIBOX_KEYWORD_HINT fetch.
+    DCHECK_EQ(content_param_offsets.size(), 2U);
+
+    // Where to put the [TAB] image.
+    const size_t split(content_param_offsets.front());
+
+    NSString* prefix = base::SysWideToNSString(keyword_hint.substr(0, split));
+    NSString* suffix = base::SysWideToNSString(keyword_hint.substr(split));
+
+    [cell setKeywordHintPrefix:prefix image:image suffix:suffix];
+  } else if (show_search_hint) {
+    // Show a search hint right-justified in the field if there is no
+    // keyword.
+    const std::wstring hint(l10n_util::GetString(IDS_OMNIBOX_EMPTY_TEXT));
+    [cell setSearchHintString:base::SysWideToNSString(hint)];
+  } else {
+    // Nothing interesting to show, plain old text field.
+    [cell clearKeywordAndHint];
+  }
+
+  // The field needs to re-layout if the visible decoration changed.
+  [field resetFieldEditorFrameIfNeeded];
+}
+
 void LocationBarViewMac::OnChanged() {
-  // http://crbug.com/12285
+  // Unfortunately, the unit-test Profile doesn't have the right stuff
+  // setup to do what GetKeywordName() needs to do.  So do that out
+  // here where we have a Profile and pass it into OnChangedImpl().
+  const std::wstring keyword(edit_view_->model()->keyword());
+  std::wstring short_name;
+  if (!keyword.empty()) {
+    short_name = GetKeywordName(profile_, keyword);
+  }
+
+  // TODO(shess): Implementation exported to a static so that it can
+  // be unit tested without having to setup the entire object.  This
+  // makes me sad.  I should fix that.
+  OnChangedImpl(field_,
+                keyword,
+                short_name,
+                edit_view_->model()->is_keyword_hint(),
+                edit_view_->model()->show_search_hint(),
+                GetTabButtonImage());
 }
 
 void LocationBarViewMac::OnInputInProgress(bool in_progress) {
@@ -140,3 +241,14 @@
   NOTIMPLEMENTED();
   return -1;
 }
+
+NSImage* LocationBarViewMac::GetTabButtonImage() {
+  if (!tab_button_image_) {
+    SkBitmap* skiaBitmap = ResourceBundle::GetSharedInstance().
+        GetBitmapNamed(IDR_LOCATION_BAR_KEYWORD_HINT_TAB);
+    if (skiaBitmap) {
+      tab_button_image_.reset([gfx::SkBitmapToNSImage(*skiaBitmap) retain]);
+    }
+  }
+  return tab_button_image_;
+}