Views: Draw Textfield selected text in gray when top-level Widget loses focus.

ui/views/controls/textfield/textfield.h

Index: ui/views/controls/textfield/textfield.h
diff --git a/ui/views/controls/textfield/textfield.h b/ui/views/controls/textfield/textfield.h
index 44b37d2c19e070e2892219a432fe0fe45205e17c..ceba307835fe7d819012df1b0245a1f231443480 100644
--- a/ui/views/controls/textfield/textfield.h
+++ b/ui/views/controls/textfield/textfield.h
@@ -29,6 +29,7 @@
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/textfield/textfield_model.h"
 #include "ui/views/drag_controller.h"
+#include "ui/views/focus/focus_manager.h"
 #include "ui/views/selection_controller.h"
 #include "ui/views/selection_controller_delegate.h"
 #include "ui/views/view.h"
@@ -45,6 +46,7 @@ class VIEWS_EXPORT Textfield : public View,
                                public TextfieldModel::Delegate,
                                public ContextMenuController,
                                public DragController,
+                               public FocusChangeListener,
                                public WordLookupClient,
                                public SelectionControllerDelegate,
                                public ui::TouchEditable,
@@ -140,6 +142,10 @@ class VIEWS_EXPORT Textfield : public View,
   void SetSelectionBackgroundColor(SkColor color);
   void UseDefaultSelectionBackgroundColor();
 
+  // Gets the selection background color for use when the Textfield was the last
+  // to be focused in a widget.
+  SkColor GetUnfocusedSelectionBackgroundColor() const;
+
   // Set drop shadows underneath the text.
   void SetShadows(const gfx::ShadowValues& shadows);
 
@@ -243,6 +249,9 @@ class VIEWS_EXPORT Textfield : public View,
   bool GetNeedsNotificationWhenVisibleBoundsChange() const override;
   void OnVisibleBoundsChanged() override;
   void OnEnabledChanged() override;
+  void ViewHierarchyChanged(
+      const ViewHierarchyChangedDetails& details) override;
+  void NativeViewHierarchyChanged() override;
   void OnPaint(gfx::Canvas* canvas) override;
   void OnFocus() override;
   void OnBlur() override;
@@ -266,6 +275,10 @@ class VIEWS_EXPORT Textfield : public View,
                            const gfx::Point& press_pt,
                            const gfx::Point& p) override;
 
+  // FocusChangeListener overrides:
+  void OnWillChangeFocus(View* focused_before, View* focused_now) override;
+  void OnDidChangeFocus(View* focused_before, View* focused_now) override;
+
   // WordLookupClient overrides:
   bool GetDecoratedWordAtPoint(const gfx::Point& point,
                                gfx::DecoratedText* decorated_word,
@@ -363,6 +376,10 @@ class VIEWS_EXPORT Textfield : public View,
   bool PasteSelectionClipboard() override;
   void UpdateSelectionClipboard() override;
 
+  // Adds or removes this Textfield as a FocusChangeListener based on
+  // |add_as_listener|.
+  void AddOrRemoveAsFocusChangeListener(bool add_as_listener);

[tapted, 2016/11/02 03:45:06]

It's generally nice to have a `bool` argument read unambiguously even if you
don't know the name of the argument. E.g. I'd suggest

ObserveWidgetFocusChanges(true)


OWNERS might have other ideas though :/

[Patti Lor, 2016/11/07 05:34:27]

Done.

+
   // Handles a request to change the value of this text field from software
   // using an accessibility API (typically automation software, screen readers
   // don't normally use this). If |clear_first| is true, this replaces all text
@@ -472,6 +489,12 @@ class VIEWS_EXPORT Textfield : public View,
   SkColor selection_text_color_;
   SkColor selection_background_color_;
 
+  // In cases where the Widget is deleted before the Textfield, there is no
+  // longer a way to retrieve the FocusManager. It's still needed to remove this
+  // Textfield as an observer, so keep a reference to the FocusManager this
+  // Textfield is listening to, if any.
+  FocusManager* focus_manager_;
+
   // Text to display when empty.
   base::string16 placeholder_text_;