Display tooltips for gtk tabs that have elided titles.

BUG=none
TEST=Navigate to a URL with an elided title in the tab.  Hover the mouse over the tab.  A tooltip should appear with the full title.  Navigate to google.com and hover over the tab.  A tooltip should not appear (unless the tab is small enough).
Review URL: http://codereview.chromium.org/118161

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17507 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 16 insertions, 1 deletions

diff --git a/chrome/browser/gtk/tabs/tab_gtk.cc b/chrome/browser/gtk/tabs/tab_gtk.cc
index 55062dc..02b1b03 100644
--- a/chrome/browser/gtk/tabs/tab_gtk.cc
+++ b/chrome/browser/gtk/tabs/tab_gtk.cc
@@ -270,6 +270,20 @@ void TabGtk::CloseButtonClicked() {
   delegate_->CloseTab(this);
 }
 
+void TabGtk::UpdateData(TabContents* contents, bool loading_only) {
+  TabRendererGtk::UpdateData(contents, loading_only);
+  std::wstring title = GetTitle();
+  if (!title.empty()) {
+    // Only show the tooltip if the title is truncated.
+    gfx::Font font;
+    if (font.GetStringWidth(title) > title_bounds().width()) {
+      gtk_widget_set_tooltip_text(widget(), WideToUTF8(title).c_str());
+    } else {
+      gtk_widget_set_has_tooltip(widget(), FALSE);
+    }
+  }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // TabGtk, private:
 
diff --git a/chrome/browser/gtk/tabs/tab_gtk.h b/chrome/browser/gtk/tabs/tab_gtk.h
index 6e2296e..195d04c 100644
--- a/chrome/browser/gtk/tabs/tab_gtk.h
+++ b/chrome/browser/gtk/tabs/tab_gtk.h
@@ -81,6 +81,7 @@ class TabGtk : public TabRendererGtk {
   virtual bool IsVisible() const;
   virtual void SetVisible(bool visible) const;
   virtual void CloseButtonClicked();
+  virtual void UpdateData(TabContents* contents, bool loading_only);
 
   // The callback that is called for every gdk event.  We use it to inspect for
   // drag-motion events when the drag is outside of the source tab.
diff --git a/chrome/browser/gtk/tabs/tab_renderer_gtk.h b/chrome/browser/gtk/tabs/tab_renderer_gtk.h
index 2cff947..4f555a1 100644
--- a/chrome/browser/gtk/tabs/tab_renderer_gtk.h
+++ b/chrome/browser/gtk/tabs/tab_renderer_gtk.h
@@ -77,7 +77,7 @@ class TabRendererGtk : public AnimationDelegate {
   // TabContents. If only the loading state was updated, the loading_only flag
   // should be specified. If other things change, set this flag to false to
   // update everything.
-  void UpdateData(TabContents* contents, bool loading_only);
+  virtual void UpdateData(TabContents* contents, bool loading_only);
 
   // Updates the display to reflect the contents of this TabRenderer's model.
   void UpdateFromModel();