views::Textfield: Implement yank editing command.

ui/views/controls/textfield/textfield.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.h"
 
 #include <string>
 #include <utility>
 
 #include "base/trace_event/trace_event.h"
@@ skipping 1470 matching lines @@
     case ui::TextEditCommand::CUT:
       return editable && readable && model_->HasSelection();
     case ui::TextEditCommand::COPY:
       return readable && model_->HasSelection();
     case ui::TextEditCommand::PASTE:
       ui::Clipboard::GetForCurrentThread()->ReadText(
           ui::CLIPBOARD_TYPE_COPY_PASTE, &result);
       return editable && !result.empty();
     case ui::TextEditCommand::SELECT_ALL:
       return !text().empty();
+    case ui::TextEditCommand::YANK:
+      return editable;
     case ui::TextEditCommand::MOVE_DOWN:
     case ui::TextEditCommand::MOVE_DOWN_AND_MODIFY_SELECTION:
     case ui::TextEditCommand::MOVE_PAGE_DOWN:
     case ui::TextEditCommand::MOVE_PAGE_DOWN_AND_MODIFY_SELECTION:
     case ui::TextEditCommand::MOVE_PAGE_UP:
     case ui::TextEditCommand::MOVE_PAGE_UP_AND_MODIFY_SELECTION:
     case ui::TextEditCommand::MOVE_UP:
     case ui::TextEditCommand::MOVE_UP_AND_MODIFY_SELECTION:
     case ui::TextEditCommand::INSERT_TEXT:
     case ui::TextEditCommand::SET_MARK:
@@ skipping 30 matching lines @@
 base::string16 Textfield::GetSelectionClipboardText() const {
   base::string16 selection_clipboard_text;
   ui::Clipboard::GetForCurrentThread()->ReadText(
       ui::CLIPBOARD_TYPE_SELECTION, &selection_clipboard_text);
   return selection_clipboard_text;
 }
 
 void Textfield::ExecuteTextEditCommand(ui::TextEditCommand command) {
   DestroyTouchSelection();
 
+  bool add_to_kill_buffer = false;
+
   // Some codepaths may bypass GetCommandForKeyEvent, so any selection-dependent
   // modifications of the command should happen here.
-  if (HasSelection()) {
-    switch (command) {
-      case ui::TextEditCommand::DELETE_TO_BEGINNING_OF_LINE:
-      case ui::TextEditCommand::DELETE_TO_BEGINNING_OF_PARAGRAPH:
-      case ui::TextEditCommand::DELETE_TO_END_OF_LINE:
-      case ui::TextEditCommand::DELETE_TO_END_OF_PARAGRAPH:
-      case ui::TextEditCommand::DELETE_WORD_BACKWARD:
-      case ui::TextEditCommand::DELETE_WORD_FORWARD:
+  switch (command) {
+    case ui::TextEditCommand::DELETE_TO_BEGINNING_OF_LINE:
+    case ui::TextEditCommand::DELETE_TO_BEGINNING_OF_PARAGRAPH:
+    case ui::TextEditCommand::DELETE_TO_END_OF_LINE:
+    case ui::TextEditCommand::DELETE_TO_END_OF_PARAGRAPH:
+      add_to_kill_buffer = true;

[karandeepb, 2016/07/01 05:49:16]

Interestingly Command+X(Cut) also adds text to the kill buffer. However I can't
find this documented anywhere and also Blink does not do this.

+    // Fall through.
+    case ui::TextEditCommand::DELETE_WORD_BACKWARD:
+    case ui::TextEditCommand::DELETE_WORD_FORWARD:
+      if (HasSelection())
         command = ui::TextEditCommand::DELETE_FORWARD;
-        break;
-      default:
-        break;
-    }
+      break;
+    default:
+      break;
   }
 
   // We only execute the commands enabled in Textfield::IsTextEditCommandEnabled
   // below. Hence don't do a virtual IsTextEditCommandEnabled call.
   if (!Textfield::IsTextEditCommandEnabled(command))
     return;
 
   bool text_changed = false;
   bool cursor_changed = false;
   bool rtl = GetTextDirection() == base::i18n::RIGHT_TO_LEFT;
   gfx::VisualCursorDirection begin = rtl ? gfx::CURSOR_RIGHT : gfx::CURSOR_LEFT;
   gfx::VisualCursorDirection end = rtl ? gfx::CURSOR_LEFT : gfx::CURSOR_RIGHT;
   gfx::SelectionModel selection_model = GetSelectionModel();
 
   OnBeforeUserAction();
   switch (command) {
     case ui::TextEditCommand::DELETE_BACKWARD:
-      text_changed = cursor_changed = model_->Backspace();
+      text_changed = cursor_changed = model_->Backspace(add_to_kill_buffer);
       break;
     case ui::TextEditCommand::DELETE_FORWARD:
-      text_changed = cursor_changed = model_->Delete();
+      text_changed = cursor_changed = model_->Delete(add_to_kill_buffer);
       break;
     case ui::TextEditCommand::DELETE_TO_BEGINNING_OF_LINE:
     case ui::TextEditCommand::DELETE_TO_BEGINNING_OF_PARAGRAPH:
       model_->MoveCursor(gfx::LINE_BREAK, begin, true);
-      text_changed = cursor_changed = model_->Backspace();
+      text_changed = cursor_changed = model_->Backspace(add_to_kill_buffer);
       break;
     case ui::TextEditCommand::DELETE_TO_END_OF_LINE:
     case ui::TextEditCommand::DELETE_TO_END_OF_PARAGRAPH:
       model_->MoveCursor(gfx::LINE_BREAK, end, true);
-      text_changed = cursor_changed = model_->Delete();
+      text_changed = cursor_changed = model_->Delete(add_to_kill_buffer);
       break;
     case ui::TextEditCommand::DELETE_WORD_BACKWARD:
       model_->MoveCursor(gfx::WORD_BREAK, begin, true);
-      text_changed = cursor_changed = model_->Backspace();
+      text_changed = cursor_changed = model_->Backspace(add_to_kill_buffer);
       break;
     case ui::TextEditCommand::DELETE_WORD_FORWARD:
       model_->MoveCursor(gfx::WORD_BREAK, end, true);
-      text_changed = cursor_changed = model_->Delete();
+      text_changed = cursor_changed = model_->Delete(add_to_kill_buffer);
       break;
     case ui::TextEditCommand::MOVE_BACKWARD:
       model_->MoveCursor(gfx::CHARACTER_BREAK, begin, false);
       break;
     case ui::TextEditCommand::MOVE_BACKWARD_AND_MODIFY_SELECTION:
       model_->MoveCursor(gfx::CHARACTER_BREAK, begin, true);
       break;
     case ui::TextEditCommand::MOVE_FORWARD:
       model_->MoveCursor(gfx::CHARACTER_BREAK, end, false);
       break;
@@ skipping 69 matching lines @@
       break;
     case ui::TextEditCommand::COPY:
       Copy();
       break;
     case ui::TextEditCommand::PASTE:
       text_changed = cursor_changed = Paste();
       break;
     case ui::TextEditCommand::SELECT_ALL:
       SelectAll(false);
       break;
+    case ui::TextEditCommand::YANK:
+      text_changed = cursor_changed = model_->Yank();
+      break;
     case ui::TextEditCommand::MOVE_DOWN:
     case ui::TextEditCommand::MOVE_DOWN_AND_MODIFY_SELECTION:
     case ui::TextEditCommand::MOVE_PAGE_DOWN:
     case ui::TextEditCommand::MOVE_PAGE_DOWN_AND_MODIFY_SELECTION:
     case ui::TextEditCommand::MOVE_PAGE_UP:
     case ui::TextEditCommand::MOVE_PAGE_UP_AND_MODIFY_SELECTION:
     case ui::TextEditCommand::MOVE_UP:
     case ui::TextEditCommand::MOVE_UP_AND_MODIFY_SELECTION:
     case ui::TextEditCommand::INSERT_TEXT:
     case ui::TextEditCommand::SET_MARK:
@@ skipping 266 matching lines @@
     RequestFocus();
   model_->MoveCursorTo(mouse);
   if (!selection_clipboard_text.empty()) {
     model_->InsertText(selection_clipboard_text);
     UpdateAfterChange(true, true);
   }
   OnAfterUserAction();
 }
 
 }  // namespace views