Integrate the new input method API for Views into Chromium.

views/controls/textfield/textfield_views_model.cc

 // Copyright (c) 2011 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_views_model.h"
 
 #include <algorithm>
 
 #include "base/i18n/break_iterator.h"
 #include "base/logging.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/gfx/font.h"
 #include "views/controls/textfield/textfield.h"
 #include "views/views_delegate.h"
 
 namespace views {
 
-TextfieldViewsModel::TextfieldViewsModel()
-    : cursor_pos_(0),
-      selection_begin_(0),
+TextfieldViewsModel::TextfieldViewsModel(Delegate* delegate)
+    : delegate_(delegate),
+      cursor_pos_(0),
+      selection_start_(0),
+      composition_start_(0),
+      composition_end_(0),
       is_password_(false) {
 }
 
 TextfieldViewsModel::~TextfieldViewsModel() {
 }
 
 void TextfieldViewsModel::GetFragments(TextFragments* fragments) const {
   DCHECK(fragments);
   fragments->clear();
-  if (HasSelection()) {
-    int begin = std::min(selection_begin_, cursor_pos_);
-    int end = std::max(selection_begin_, cursor_pos_);
-    if (begin != 0) {
-      fragments->push_back(TextFragment(0, begin, false));
+  if (HasComposition()) {
+    if (composition_start_)
+      fragments->push_back(TextFragment(0, composition_start_, false, false));
+
+    size_t selection_start = std::min(selection_start_, cursor_pos_);
+    size_t selection_end = std::max(selection_start_, cursor_pos_);
+    size_t last_end = composition_start_;
+    for (ui::CompositionUnderlines::const_iterator i =
+         composition_underlines_.begin();
+         i != composition_underlines_.end(); ++i) {
+      size_t fragment_start =
+          std::min(i->start_offset, i->end_offset) + composition_start_;
+      size_t fragment_end =
+          std::max(i->start_offset, i->end_offset) + composition_start_;
+
+      fragment_start = std::max(last_end, fragment_start);
+      fragment_end = std::min(fragment_end, composition_end_);
+
+      if (fragment_start >= fragment_end)
+        break;
+
+      // If there is no selection, then just add a text fragment with underline.
+      if (selection_start == selection_end) {
+        if (last_end < fragment_start) {
+          fragments->push_back(
+              TextFragment(last_end, fragment_start, false, false));
+        }
+        fragments->push_back(
+            TextFragment(fragment_start, fragment_end, false, true));
+        last_end = fragment_end;
+        continue;
+      }
+
+      size_t end = std::min(fragment_start, selection_start);
+      if (last_end < end)
+        fragments->push_back(TextFragment(last_end, end, false, false));
+
+      last_end = fragment_end;
+
+      if (selection_start < fragment_start) {
+        end = std::min(selection_end, fragment_start);
+        fragments->push_back(TextFragment(selection_start, end, true, false));
+        selection_start = end;
+      } else if (selection_start > fragment_start) {
+        end = std::min(selection_start, fragment_end);
+        fragments->push_back(TextFragment(fragment_start, end, false, true));
+        fragment_start = end;
+        if (fragment_start == fragment_end)
+          continue;
+      }
+
+      if (fragment_start < selection_end) {
+        DCHECK_EQ(selection_start, fragment_start);
+        end = std::min(fragment_end, selection_end);
+        fragments->push_back(TextFragment(fragment_start, end, true, true));
+        fragment_start = end;
+        selection_start = end;
+        if (fragment_start == fragment_end)
+          continue;
+      }
+
+      DCHECK_LT(fragment_start, fragment_end);
+      fragments->push_back(
+          TextFragment(fragment_start, fragment_end, false, true));
     }
-    fragments->push_back(TextFragment(begin, end, true));
-    int len = text_.length();
-    if (end != len) {
-      fragments->push_back(TextFragment(end, len, false));
+
+    if (last_end < composition_end_) {
+      if (selection_start < selection_end) {
+        DCHECK_LE(last_end, selection_start);
+        if (last_end < selection_start) {
+          fragments->push_back(
+              TextFragment(last_end, selection_start, false, false));
+        }
+        fragments->push_back(
+            TextFragment(selection_start, selection_end, true, false));
+        if (selection_end < composition_end_) {
+          fragments->push_back(
+              TextFragment(selection_end, composition_end_, false, false));
+        }
+      } else {
+        fragments->push_back(
+            TextFragment(last_end, composition_end_, false, false));
+      }
     }
+
+    size_t len = text_.length();
+    if (composition_end_ < len)
+      fragments->push_back(TextFragment(composition_end_, len, false, false));
+  } else if (HasSelection()) {
+    size_t start = std::min(selection_start_, cursor_pos_);
+    size_t end = std::max(selection_start_, cursor_pos_);
+    if (start)
+      fragments->push_back(TextFragment(0, start, false, false));
+    fragments->push_back(TextFragment(start, end, true, false));
+    size_t len = text_.length();
+    if (end != len)
+      fragments->push_back(TextFragment(end, len, false, false));
   } else {
-    fragments->push_back(TextFragment(0, text_.length(), false));
+    fragments->push_back(TextFragment(0, text_.length(), false, false));
   }
 }
 
 bool TextfieldViewsModel::SetText(const string16& text) {
-  bool changed = text_ != text;
-  if (changed) {
+  bool changed = false;
+  if (HasComposition()) {
+    ConfirmComposition();
+    changed = true;
+  }
+  if (text_ != text) {
     text_ = text;
     if (cursor_pos_ > text.length()) {
       cursor_pos_ = text.length();
     }
+    changed = true;
   }
   ClearSelection();
   return changed;
 }
 
-void TextfieldViewsModel::Insert(char16 c) {
-  if (HasSelection())
+void TextfieldViewsModel::InsertText(const string16& text) {
+  if (HasComposition())
+    ClearComposition();
+  else if (HasSelection())
     DeleteSelection();
-  text_.insert(cursor_pos_, 1, c);
-  cursor_pos_++;
+  text_.insert(cursor_pos_, text);
+  cursor_pos_ += text.size();
   ClearSelection();
 }
 
-void TextfieldViewsModel::Replace(char16 c) {
-  if (!HasSelection())
-    Delete();
-  Insert(c);
+void TextfieldViewsModel::ReplaceText(const string16& text) {
+  if (HasComposition())
+    ClearComposition();
+  else if (!HasSelection())
+    SelectRange(ui::Range(cursor_pos_, cursor_pos_ + text.length()));
+  InsertText(text);
 }
 
 void TextfieldViewsModel::Append(const string16& text) {
+  if (HasComposition())
+    ConfirmComposition();
   text_ += text;
 }
 
 bool TextfieldViewsModel::Delete() {
+  if (HasComposition()) {
+    ClearComposition();
+    return true;
+  }
   if (HasSelection()) {
     DeleteSelection();
     return true;
-  } else if (text_.length() > cursor_pos_) {
+  }
+  if (text_.length() > cursor_pos_) {
     text_.erase(cursor_pos_, 1);
     return true;
   }
   return false;
 }
 
 bool TextfieldViewsModel::Backspace() {
+  if (HasComposition()) {
+    ClearComposition();
+    return true;
+  }
   if (HasSelection()) {
     DeleteSelection();
     return true;
-  } else if (cursor_pos_ > 0) {
+  }
+  if (cursor_pos_ > 0) {
     cursor_pos_--;
     text_.erase(cursor_pos_, 1);
     ClearSelection();
     return true;
   }
   return false;
 }
 
 void TextfieldViewsModel::MoveCursorLeft(bool select) {
+  if (HasComposition())
+    ConfirmComposition();
   // TODO(oshima): support BIDI
   if (select) {
     if (cursor_pos_ > 0)
       cursor_pos_--;
   } else {
     if (HasSelection())
-      cursor_pos_ = std::min(cursor_pos_, selection_begin_);
+      cursor_pos_ = std::min(cursor_pos_, selection_start_);
     else if (cursor_pos_ > 0)
       cursor_pos_--;
     ClearSelection();
   }
 }
 
 void TextfieldViewsModel::MoveCursorRight(bool select) {
+  if (HasComposition())
+    ConfirmComposition();
   // TODO(oshima): support BIDI
   if (select) {
     cursor_pos_ = std::min(text_.length(),  cursor_pos_ + 1);
   } else {
     if  (HasSelection())
-      cursor_pos_ = std::max(cursor_pos_, selection_begin_);
+      cursor_pos_ = std::max(cursor_pos_, selection_start_);
     else
       cursor_pos_ = std::min(text_.length(),  cursor_pos_ + 1);
     ClearSelection();
   }
 }
 
 void TextfieldViewsModel::MoveCursorToPreviousWord(bool select) {
+  if (HasComposition())
+    ConfirmComposition();
   // Notes: We always iterate words from the begining.
   // This is probably fast enough for our usage, but we may
   // want to modify WordIterator so that it can start from the
   // middle of string and advance backwards.
   base::BreakIterator iter(&text_, base::BreakIterator::BREAK_WORD);
   bool success = iter.Init();
   DCHECK(success);
   if (!success)
     return;
   int last = 0;
@@ skipping 14 matching lines @@
       }
     }
   }
 
   cursor_pos_ = last;
   if (!select)
     ClearSelection();
 }
 
 void TextfieldViewsModel::MoveCursorToNextWord(bool select) {
+  if (HasComposition())
+    ConfirmComposition();
   base::BreakIterator iter(&text_, base::BreakIterator::BREAK_WORD);
   bool success = iter.Init();
   DCHECK(success);
   if (!success)
     return;
   size_t pos = 0;
   while (iter.Advance()) {
     pos = iter.pos();
     if (iter.IsWord() && pos > cursor_pos_) {
       break;
     }
   }
   cursor_pos_ = pos;
   if (!select)
     ClearSelection();
 }
 
-void TextfieldViewsModel::MoveCursorToStart(bool select) {
+void TextfieldViewsModel::MoveCursorToHome(bool select) {
+  if (HasComposition())
+    ConfirmComposition();
   cursor_pos_ = 0;
   if (!select)
     ClearSelection();
 }
 
 void TextfieldViewsModel::MoveCursorToEnd(bool select) {
+  if (HasComposition())
+    ConfirmComposition();
   cursor_pos_ = text_.length();
   if (!select)
     ClearSelection();
 }
 
 bool TextfieldViewsModel::MoveCursorTo(size_t pos, bool select) {
+  if (HasComposition())
+    ConfirmComposition();
   bool cursor_changed = false;
   if (cursor_pos_ != pos) {
     cursor_pos_ = pos;
     cursor_changed = true;
   }
   if (!select)
     ClearSelection();
   return cursor_changed;
 }
 
 gfx::Rect TextfieldViewsModel::GetCursorBounds(const gfx::Font& font) const {
   string16 text = GetVisibleText();
   int x = font.GetStringWidth(text.substr(0U, cursor_pos_));
   int h = font.GetHeight();
   DCHECK(x >= 0);
   if (text.length() == cursor_pos_) {
     return gfx::Rect(x, 0, 0, h);
   } else {
     int x_end = font.GetStringWidth(text.substr(0U, cursor_pos_ + 1U));
     return gfx::Rect(x, 0, x_end - x, h);
   }
 }
 
 string16 TextfieldViewsModel::GetSelectedText() const {
   return text_.substr(
-      std::min(cursor_pos_, selection_begin_),
-      std::abs(static_cast<long>(cursor_pos_ - selection_begin_)));
+      std::min(cursor_pos_, selection_start_),
+      std::abs(static_cast<long>(cursor_pos_ - selection_start_)));
 }
 
 void TextfieldViewsModel::GetSelectedRange(ui::Range* range) const {
-  *range = ui::Range(selection_begin_, cursor_pos_);
+  *range = ui::Range(selection_start_, cursor_pos_);
 }
 
 void TextfieldViewsModel::SelectRange(const ui::Range& range) {
-  selection_begin_ = GetSafePosition(range.start());
+  if (HasComposition())
+    ConfirmComposition();
+  selection_start_ = GetSafePosition(range.start());
   cursor_pos_ = GetSafePosition(range.end());
 }
 
 void TextfieldViewsModel::SelectAll() {
+  if (HasComposition())
+    ConfirmComposition();
   // SelectAll selects towards the end.
   cursor_pos_ = text_.length();
-  selection_begin_ = 0;
+  selection_start_ = 0;
 }
 
 void TextfieldViewsModel::SelectWord() {
-  // First we setup selection_begin_ and cursor_pos_. There are so many cases
+  if (HasComposition())
+    ConfirmComposition();
+  // First we setup selection_start_ and cursor_pos_. There are so many cases
   // because we try to emulate what select-word looks like in a gtk textfield.
   // See associated testcase for different cases.
   if (cursor_pos_ > 0 && cursor_pos_ < text_.length()) {
     if (isalnum(text_[cursor_pos_])) {
-      selection_begin_ = cursor_pos_;
+      selection_start_ = cursor_pos_;
       cursor_pos_++;
     } else
-      selection_begin_ = cursor_pos_ - 1;
+      selection_start_ = cursor_pos_ - 1;
   } else if (cursor_pos_ == 0) {
-    selection_begin_ = cursor_pos_;
+    selection_start_ = cursor_pos_;
     if (text_.length() > 0)
       cursor_pos_++;
   } else {
-    selection_begin_ = cursor_pos_ - 1;
+    selection_start_ = cursor_pos_ - 1;
   }
 
-  // Now we move selection_begin_ to beginning of selection. Selection boundary
+  // Now we move selection_start_ to beginning of selection. Selection boundary
   // is defined as the position where we have alpha-num character on one side
   // and non-alpha-num char on the other side.
-  for (; selection_begin_ > 0; selection_begin_--) {
-    if (IsPositionAtWordSelectionBoundary(selection_begin_))
+  for (; selection_start_ > 0; selection_start_--) {
+    if (IsPositionAtWordSelectionBoundary(selection_start_))
       break;
   }
 
   // Now we move cursor_pos_ to end of selection. Selection boundary
   // is defined as the position where we have alpha-num character on one side
   // and non-alpha-num char on the other side.
   for (; cursor_pos_ < text_.length(); cursor_pos_++) {
     if (IsPositionAtWordSelectionBoundary(cursor_pos_))
       break;
   }
 }
 
 void TextfieldViewsModel::ClearSelection() {
-  selection_begin_ = cursor_pos_;
+  if (HasComposition())
+    ConfirmComposition();
+  selection_start_ = cursor_pos_;
 }
 
 bool TextfieldViewsModel::Cut() {
-  if (HasSelection()) {
+  if (!HasComposition() && HasSelection()) {
     ui::ScopedClipboardWriter(views::ViewsDelegate::views_delegate
         ->GetClipboard()).WriteText(GetSelectedText());
     DeleteSelection();
     return true;
   }
   return false;
 }
 
 void TextfieldViewsModel::Copy() {
-  if (HasSelection()) {
+  if (!HasComposition() && HasSelection()) {
     ui::ScopedClipboardWriter(views::ViewsDelegate::views_delegate
         ->GetClipboard()).WriteText(GetSelectedText());
   }
 }
 
 bool TextfieldViewsModel::Paste() {
   string16 result;
   views::ViewsDelegate::views_delegate->GetClipboard()
       ->ReadText(ui::Clipboard::BUFFER_STANDARD, &result);
   if (!result.empty()) {
-    if (HasSelection())
+    if (HasComposition())
+      ConfirmComposition();
+    else if (HasSelection())
       DeleteSelection();
     text_.insert(cursor_pos_, result);
     cursor_pos_ += result.length();
     ClearSelection();
     return true;
   }
   return false;
 }
 
 bool TextfieldViewsModel::HasSelection() const {
-  return selection_begin_ != cursor_pos_;
+  return selection_start_ != cursor_pos_;
 }
 
 void TextfieldViewsModel::DeleteSelection() {
+  DCHECK(!HasComposition());
   DCHECK(HasSelection());
-  size_t n = std::abs(static_cast<long>(cursor_pos_ - selection_begin_));
-  size_t begin = std::min(cursor_pos_, selection_begin_);
+  size_t n = std::abs(static_cast<long>(cursor_pos_ - selection_start_));
+  size_t begin = std::min(cursor_pos_, selection_start_);
   text_.erase(begin, n);
   cursor_pos_ = begin;
   ClearSelection();
 }
 
+string16 TextfieldViewsModel::GetTextFromRange(const ui::Range& range) const {
+  if (range.IsValid() && range.GetMin() < text_.length())
+    return text_.substr(range.GetMin(), range.length());
+  return string16();
+}
+
+void TextfieldViewsModel::GetTextRange(ui::Range* range) const {
+  *range = ui::Range(0, text_.length());
+}
+
+void TextfieldViewsModel::SetComposition(const ui::Composition& composition) {
+  if (HasComposition())
+    ClearComposition();
+  else if (HasSelection())
+    DeleteSelection();
+
+  if (composition.text.empty())
+    return;
+
+  size_t length = composition.text.length();
+  text_.insert(cursor_pos_, composition.text);
+  composition_start_ = cursor_pos_;
+  composition_end_ = composition_start_ + length;
+  composition_underlines_ = composition.underlines;
+
+  if (composition.selection.IsValid()) {
+    selection_start_ =
+        std::min(composition_start_ + composition.selection.start(),
+                 composition_end_);
+    cursor_pos_ =
+        std::min(composition_start_ + composition.selection.end(),
+                 composition_end_);
+  } else {
+    cursor_pos_ = composition_end_;
+    ClearSelection();
+  }
+}
+
+void TextfieldViewsModel::ConfirmComposition() {
+  DCHECK(HasComposition());
+  cursor_pos_ = composition_end_;
+  composition_start_ = composition_end_ = string16::npos;
+  composition_underlines_.clear();
+  ClearSelection();
+  if (delegate_)
+    delegate_->OnCompositionConfirmedOrCleared();
+}
+
+void TextfieldViewsModel::ClearComposition() {
+  DCHECK(HasComposition());
+  text_.erase(composition_start_, composition_end_ - composition_start_);
+  cursor_pos_ = composition_start_;
+  composition_start_ = composition_end_ = string16::npos;
+  composition_underlines_.clear();
+  ClearSelection();
+  if (delegate_)
+    delegate_->OnCompositionConfirmedOrCleared();
+}
+
+void TextfieldViewsModel::GetCompositionRange(ui::Range* range) const {
+  if (HasComposition())
+    *range = ui::Range(composition_start_, composition_end_);
+  else
+    *range = ui::Range::InvalidRange();
+}
+
+bool TextfieldViewsModel::HasComposition() const {
+  return composition_start_ != composition_end_;
+}
+
 string16 TextfieldViewsModel::GetVisibleText(size_t begin, size_t end) const {
   DCHECK(end >= begin);
   if (is_password_) {
     return string16(end - begin, '*');
   }

[oshima, 2011/03/22 01:50:39]

can you eliminate {} while we're at it?

[James Su, 2011/03/22 08:41:14]

Done.

   return text_.substr(begin, end - begin);
 }
 
 bool TextfieldViewsModel::IsPositionAtWordSelectionBoundary(size_t pos) {
   return (isalnum(text_[pos - 1]) && !isalnum(text_[pos])) ||
       (!isalnum(text_[pos - 1]) && isalnum(text_[pos]));
 }
 
 size_t TextfieldViewsModel::GetSafePosition(size_t position) const {
   if (position > text_.length()) {
     return text_.length();
   }
   return position;
 }
 
 }  // namespace views