Model, View and Controller for a Gap Buffer based one line text field in view...

views/controls/textfield/textfield_model.cc

+// Copyright (c) 2010 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 "views/controls/textfield/textfield_model.h"
+
+namespace views {
+
+TextfieldModel::TextfieldModel()
+    : text_(L""),
+      dirty_(true) {
+  this->buffer_.reset(new base::GapBuffer<wchar_t>(50));
+}
+
+TextfieldModel::TextfieldModel(const std::wstring& text)
+    : text_(L""),
+      dirty_(true) {
+  scoped_array<wchar_t> text_array;
+  text_array.reset(new wchar_t[text.length()]);
+  this->buffer_.reset(new base::GapBuffer<wchar_t>(text.data(), text.length()));
+}
+
+void TextfieldModel::Insert(wchar_t c) {
+  buffer_->InsertAtGapStart(c);
+  dirty_ = true;
+}
+
+wchar_t TextfieldModel::InsertDelete() {
+  dirty_ = true;
+  return buffer_->RemoveFromGapEnd();
+}
+
+wchar_t TextfieldModel::InsertBackspace() {
+  dirty_ = true;
+  return buffer_->RemoveFromGapStart();
+}
+
+int TextfieldModel::GetCurrentCursorPos() {
+  return buffer_->GetGapStart();
+}
+
+void TextfieldModel::MoveCursorLeft() {
+  buffer_->MoveGapLeft(1);
+}
+
+void TextfieldModel::MoveCursorRight() {
+  buffer_->MoveGapRight(1);
+}
+
+void TextfieldModel::MoveCursorToPreviousWord() {
+  buffer_->MoveGapLeft(1);
+  buffer_->MoveGapLeftTo(' ');
+}
+
+void TextfieldModel::MoveCursorToNextWord() {
+  buffer_->MoveGapRightTo(' ');
+}
+
+void TextfieldModel::MoveCursorToStart() {
+  buffer_->MoveGapLeft(buffer_->GetCurrentSize());
+}
+
+void TextfieldModel::MoveCursorToEnd() {
+  buffer_->MoveGapRight(buffer_->GetCurrentSize());
+}
+
+std::wstring TextfieldModel::text() {
+  if (dirty_) {
+    SyncText();
+    dirty_ = false;
+  }
+  return text_;
+}
+
+void TextfieldModel::SyncText() {
+  std::vector<wchar_t> contents;
+  buffer_->GetContents(&contents);
+  std::vector<wchar_t>::const_iterator iter;
+  text_ = L"";
+  for (iter = contents.begin(); iter != contents.end(); iter++) {
+    text_ += (*iter);
+  }
+}
+};