Reintroduce password support to NativeTextfieldViews

ui/views/controls/textfield/textfield_views_model.cc

 // Copyright (c) 2012 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 "ui/views/controls/textfield/textfield_views_model.h"
 
 #include <algorithm>
 
 #include "base/i18n/break_iterator.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/utf_string_conversions.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
 #include "ui/base/range/range.h"
+#include "ui/base/text/utf16_indexing.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/render_text.h"
 #include "ui/views/controls/textfield/textfield.h"
 #include "ui/views/views_delegate.h"
 
 namespace views {
 
 namespace internal {
 
@@ skipping 328 matching lines @@
 bool TextfieldViewsModel::Backspace() {
   if (HasCompositionText()) {
     // No undo/redo for composition text.
     CancelCompositionText();
     return true;
   }
   if (HasSelection()) {
     DeleteSelection();
     return true;
   }
-  if (GetCursorPosition() > 0) {
-    size_t cursor_position = GetCursorPosition();
-    ExecuteAndRecordDelete(cursor_position, cursor_position - 1, true);
+  size_t cursor_position = GetCursorPosition();
+  if (cursor_position > 0) {
+    // Delete one code point, which may be two UTF-16 words.
+    size_t previous_char =
+        ui::UTF16OffsetToIndex(GetText(), cursor_position, -1);
+    ExecuteAndRecordDelete(cursor_position, previous_char, true);
     return true;
   }
   return false;
 }
 
 size_t TextfieldViewsModel::GetCursorPosition() const {
   return render_text_->GetCursorPosition();
 }
 
 void TextfieldViewsModel::MoveCursor(gfx::BreakType break_type,
@@ skipping 114 matching lines @@
     current_edit_ = edit_history_.begin();
   else
     current_edit_ ++;
   string16 old = GetText();
   size_t old_cursor = GetCursorPosition();
   (*current_edit_)->Redo(this);
   return old != GetText() || old_cursor != GetCursorPosition();
 }
 
 bool TextfieldViewsModel::Cut() {
-  if (!HasCompositionText() && HasSelection()) {
+  if (!HasCompositionText() && HasSelection() && !render_text_->is_obscured()) {
     ui::ScopedClipboardWriter(
         views::ViewsDelegate::views_delegate->GetClipboard(),
         ui::Clipboard::BUFFER_STANDARD).WriteText(GetSelectedText());
     // A trick to let undo/redo handle cursor correctly.
     // Undoing CUT moves the cursor to the end of the change rather
     // than beginning, unlike Delete/Backspace.
     // TODO(oshima): Change Delete/Backspace to use DeleteSelection,
     // update DeleteEdit and remove this trick.
     render_text_->SelectRange(ui::Range(render_text_->GetCursorPosition(),
                                         render_text_->GetSelectionStart()));
     DeleteSelection();
     return true;
   }
   return false;
 }
 
 bool TextfieldViewsModel::Copy() {
-  if (!HasCompositionText() && HasSelection()) {
+  if (!HasCompositionText() && HasSelection() && !render_text_->is_obscured()) {
     ui::ScopedClipboardWriter(
         views::ViewsDelegate::views_delegate->GetClipboard(),
         ui::Clipboard::BUFFER_STANDARD).WriteText(GetSelectedText());
     return true;
   }
   return false;
 }
 
 bool TextfieldViewsModel::Paste() {
   string16 result;
@@ skipping 246 matching lines @@
   if (delete_from != delete_to)
     render_text_->SetText(text.erase(delete_from, delete_to - delete_from));
   if (!new_text.empty())
     render_text_->SetText(text.insert(new_text_insert_at, new_text));
   render_text_->SetCursorPosition(new_cursor_pos);
   // TODO(oshima): mac selects the text that is just undone (but gtk doesn't).
   // This looks fine feature and we may want to do the same.
 }
 
 }  // namespace views