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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "ui/views/controls/textfield/textfield_model.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "base/stl_util.h" | |
| 11 #include "ui/base/clipboard/clipboard.h" | |
| 12 #include "ui/base/clipboard/scoped_clipboard_writer.h" | |
| 13 #include "ui/gfx/range/range.h" | |
| 14 #include "ui/gfx/utf16_indexing.h" | |
| 15 | |
| 16 namespace views { | |
| 17 | |
| 18 namespace internal { | |
| 19 | |
| 20 // Edit holds state information to undo/redo editing changes. Editing operations | |
| 21 // are merged when possible, like when characters are typed in sequence. Calling | |
| 22 // Commit() marks an edit as an independent operation that shouldn't be merged. | |
| 23 class Edit { | |
| 24 public: | |
| 25 enum Type { | |
| 26 INSERT_EDIT, | |
| 27 DELETE_EDIT, | |
| 28 REPLACE_EDIT, | |
| 29 }; | |
| 30 | |
| 31 virtual ~Edit() {} | |
| 32 | |
| 33 // Revert the change made by this edit in |model|. | |
| 34 void Undo(TextfieldModel* model) { | |
| 35 model->ModifyText(new_text_start_, new_text_end(), | |
| 36 old_text_, old_text_start_, | |
| 37 old_cursor_pos_); | |
| 38 } | |
| 39 | |
| 40 // Apply the change of this edit to the |model|. | |
| 41 void Redo(TextfieldModel* model) { | |
| 42 model->ModifyText(old_text_start_, old_text_end(), | |
| 43 new_text_, new_text_start_, | |
| 44 new_cursor_pos_); | |
| 45 } | |
| 46 | |
| 47 // Try to merge the |edit| into this edit and returns true on success. The | |
| 48 // merged edit will be deleted after redo and should not be reused. | |
| 49 bool Merge(const Edit* edit) { | |
| 50 // Don't merge if previous edit is DELETE. This happens when a | |
| 51 // user deletes characters then hits return. In this case, the | |
| 52 // delete should be treated as separate edit that can be undone | |
| 53 // and should not be merged with the replace edit. | |
| 54 if (type_ != DELETE_EDIT && edit->force_merge()) { | |
| 55 MergeReplace(edit); | |
| 56 return true; | |
| 57 } | |
| 58 return mergeable() && edit->mergeable() && DoMerge(edit); | |
| 59 } | |
| 60 | |
| 61 // Commits the edit and marks as un-mergeable. | |
| 62 void Commit() { merge_type_ = DO_NOT_MERGE; } | |
| 63 | |
| 64 private: | |
| 65 friend class InsertEdit; | |
| 66 friend class ReplaceEdit; | |
| 67 friend class DeleteEdit; | |
| 68 | |
| 69 Edit(Type type, | |
| 70 MergeType merge_type, | |
| 71 size_t old_cursor_pos, | |
| 72 const base::string16& old_text, | |
| 73 size_t old_text_start, | |
| 74 bool delete_backward, | |
| 75 size_t new_cursor_pos, | |
| 76 const base::string16& new_text, | |
| 77 size_t new_text_start) | |
| 78 : type_(type), | |
| 79 merge_type_(merge_type), | |
| 80 old_cursor_pos_(old_cursor_pos), | |
| 81 old_text_(old_text), | |
| 82 old_text_start_(old_text_start), | |
| 83 delete_backward_(delete_backward), | |
| 84 new_cursor_pos_(new_cursor_pos), | |
| 85 new_text_(new_text), | |
| 86 new_text_start_(new_text_start) { | |
| 87 } | |
| 88 | |
| 89 // Each type of edit provides its own specific merge implementation. | |
| 90 virtual bool DoMerge(const Edit* edit) = 0; | |
| 91 | |
| 92 Type type() const { return type_; } | |
| 93 | |
| 94 // Can this edit be merged? | |
| 95 bool mergeable() const { return merge_type_ == MERGEABLE; } | |
| 96 | |
| 97 // Should this edit be forcibly merged with the previous edit? | |
| 98 bool force_merge() const { return merge_type_ == FORCE_MERGE; } | |
| 99 | |
| 100 // Returns the end index of the |old_text_|. | |
| 101 size_t old_text_end() const { return old_text_start_ + old_text_.length(); } | |
| 102 | |
| 103 // Returns the end index of the |new_text_|. | |
| 104 size_t new_text_end() const { return new_text_start_ + new_text_.length(); } | |
| 105 | |
| 106 // Merge the replace edit into the current edit. This handles the special case | |
| 107 // where an omnibox autocomplete string is set after a new character is typed. | |
| 108 void MergeReplace(const Edit* edit) { | |
| 109 CHECK_EQ(REPLACE_EDIT, edit->type_); | |
| 110 CHECK_EQ(0U, edit->old_text_start_); | |
| 111 CHECK_EQ(0U, edit->new_text_start_); | |
| 112 base::string16 old_text = edit->old_text_; | |
| 113 old_text.erase(new_text_start_, new_text_.length()); | |
| 114 old_text.insert(old_text_start_, old_text_); | |
| 115 // SetText() replaces entire text. Set |old_text_| to the entire | |
| 116 // replaced text with |this| edit undone. | |
| 117 old_text_ = old_text; | |
| 118 old_text_start_ = edit->old_text_start_; | |
| 119 delete_backward_ = false; | |
| 120 | |
| 121 new_text_ = edit->new_text_; | |
| 122 new_text_start_ = edit->new_text_start_; | |
| 123 merge_type_ = DO_NOT_MERGE; | |
| 124 } | |
| 125 | |
| 126 Type type_; | |
| 127 | |
| 128 // True if the edit can be marged. | |
| 129 MergeType merge_type_; | |
| 130 // Old cursor position. | |
| 131 size_t old_cursor_pos_; | |
| 132 // Deleted text by this edit. | |
| 133 base::string16 old_text_; | |
| 134 // The index of |old_text_|. | |
| 135 size_t old_text_start_; | |
| 136 // True if the deletion is made backward. | |
| 137 bool delete_backward_; | |
| 138 // New cursor position. | |
| 139 size_t new_cursor_pos_; | |
| 140 // Added text. | |
| 141 base::string16 new_text_; | |
| 142 // The index of |new_text_| | |
| 143 size_t new_text_start_; | |
| 144 | |
| 145 DISALLOW_COPY_AND_ASSIGN(Edit); | |
| 146 }; | |
| 147 | |
| 148 class InsertEdit : public Edit { | |
| 149 public: | |
| 150 InsertEdit(bool mergeable, const base::string16& new_text, size_t at) | |
| 151 : Edit(INSERT_EDIT, | |
| 152 mergeable ? MERGEABLE : DO_NOT_MERGE, | |
| 153 at /* old cursor */, | |
| 154 base::string16(), | |
| 155 at, | |
| 156 false /* N/A */, | |
| 157 at + new_text.length() /* new cursor */, | |
| 158 new_text, | |
| 159 at) { | |
| 160 } | |
| 161 | |
| 162 // Edit implementation. | |
| 163 virtual bool DoMerge(const Edit* edit) override { | |
| 164 if (edit->type() != INSERT_EDIT || new_text_end() != edit->new_text_start_) | |
| 165 return false; | |
| 166 // If continuous edit, merge it. | |
| 167 // TODO(oshima): gtk splits edits between whitespace. Find out what | |
| 168 // we want to here and implement if necessary. | |
| 169 new_text_ += edit->new_text_; | |
| 170 new_cursor_pos_ = edit->new_cursor_pos_; | |
| 171 return true; | |
| 172 } | |
| 173 }; | |
| 174 | |
| 175 class ReplaceEdit : public Edit { | |
| 176 public: | |
| 177 ReplaceEdit(MergeType merge_type, | |
| 178 const base::string16& old_text, | |
| 179 size_t old_cursor_pos, | |
| 180 size_t old_text_start, | |
| 181 bool backward, | |
| 182 size_t new_cursor_pos, | |
| 183 const base::string16& new_text, | |
| 184 size_t new_text_start) | |
| 185 : Edit(REPLACE_EDIT, merge_type, | |
| 186 old_cursor_pos, | |
| 187 old_text, | |
| 188 old_text_start, | |
| 189 backward, | |
| 190 new_cursor_pos, | |
| 191 new_text, | |
| 192 new_text_start) { | |
| 193 } | |
| 194 | |
| 195 // Edit implementation. | |
| 196 virtual bool DoMerge(const Edit* edit) override { | |
| 197 if (edit->type() == DELETE_EDIT || | |
| 198 new_text_end() != edit->old_text_start_ || | |
| 199 edit->old_text_start_ != edit->new_text_start_) | |
| 200 return false; | |
| 201 old_text_ += edit->old_text_; | |
| 202 new_text_ += edit->new_text_; | |
| 203 new_cursor_pos_ = edit->new_cursor_pos_; | |
| 204 return true; | |
| 205 } | |
| 206 }; | |
| 207 | |
| 208 class DeleteEdit : public Edit { | |
| 209 public: | |
| 210 DeleteEdit(bool mergeable, | |
| 211 const base::string16& text, | |
| 212 size_t text_start, | |
| 213 bool backward) | |
| 214 : Edit(DELETE_EDIT, | |
| 215 mergeable ? MERGEABLE : DO_NOT_MERGE, | |
| 216 (backward ? text_start + text.length() : text_start), | |
| 217 text, | |
| 218 text_start, | |
| 219 backward, | |
| 220 text_start, | |
| 221 base::string16(), | |
| 222 text_start) { | |
| 223 } | |
| 224 | |
| 225 // Edit implementation. | |
| 226 virtual bool DoMerge(const Edit* edit) override { | |
| 227 if (edit->type() != DELETE_EDIT) | |
| 228 return false; | |
| 229 | |
| 230 if (delete_backward_) { | |
| 231 // backspace can be merged only with backspace at the same position. | |
| 232 if (!edit->delete_backward_ || old_text_start_ != edit->old_text_end()) | |
| 233 return false; | |
| 234 old_text_start_ = edit->old_text_start_; | |
| 235 old_text_ = edit->old_text_ + old_text_; | |
| 236 new_cursor_pos_ = edit->new_cursor_pos_; | |
| 237 } else { | |
| 238 // delete can be merged only with delete at the same position. | |
| 239 if (edit->delete_backward_ || old_text_start_ != edit->old_text_start_) | |
| 240 return false; | |
| 241 old_text_ += edit->old_text_; | |
| 242 } | |
| 243 return true; | |
| 244 } | |
| 245 }; | |
| 246 | |
| 247 } // namespace internal | |
| 248 | |
| 249 namespace { | |
| 250 | |
| 251 // Returns the first segment that is visually emphasized. Usually it's used for | |
| 252 // representing the target clause (on Windows). Returns an invalid range if | |
| 253 // there is no such a range. | |
| 254 gfx::Range GetFirstEmphasizedRange(const ui::CompositionText& composition) { | |
| 255 for (size_t i = 0; i < composition.underlines.size(); ++i) { | |
| 256 const ui::CompositionUnderline& underline = composition.underlines[i]; | |
| 257 if (underline.thick) | |
| 258 return gfx::Range(underline.start_offset, underline.end_offset); | |
| 259 } | |
| 260 return gfx::Range::InvalidRange(); | |
| 261 } | |
| 262 | |
| 263 } // namespace | |
| 264 | |
| 265 using internal::Edit; | |
| 266 using internal::DeleteEdit; | |
| 267 using internal::InsertEdit; | |
| 268 using internal::ReplaceEdit; | |
| 269 using internal::MergeType; | |
| 270 using internal::DO_NOT_MERGE; | |
| 271 using internal::FORCE_MERGE; | |
| 272 using internal::MERGEABLE; | |
| 273 | |
| 274 ///////////////////////////////////////////////////////////////// | |
| 275 // TextfieldModel: public | |
| 276 | |
| 277 TextfieldModel::Delegate::~Delegate() {} | |
| 278 | |
| 279 TextfieldModel::TextfieldModel(Delegate* delegate) | |
| 280 : delegate_(delegate), | |
| 281 render_text_(gfx::RenderText::CreateInstance()), | |
| 282 current_edit_(edit_history_.end()) { | |
| 283 } | |
| 284 | |
| 285 TextfieldModel::~TextfieldModel() { | |
| 286 ClearEditHistory(); | |
| 287 ClearComposition(); | |
| 288 } | |
| 289 | |
| 290 bool TextfieldModel::SetText(const base::string16& new_text) { | |
| 291 bool changed = false; | |
| 292 if (HasCompositionText()) { | |
| 293 ConfirmCompositionText(); | |
| 294 changed = true; | |
| 295 } | |
| 296 if (text() != new_text) { | |
| 297 if (changed) // No need to remember composition. | |
| 298 Undo(); | |
| 299 size_t old_cursor = GetCursorPosition(); | |
| 300 // SetText moves the cursor to the end. | |
| 301 size_t new_cursor = new_text.length(); | |
| 302 SelectAll(false); | |
| 303 // If there is a composition text, don't merge with previous edit. | |
| 304 // Otherwise, force merge the edits. | |
| 305 ExecuteAndRecordReplace(changed ? DO_NOT_MERGE : FORCE_MERGE, | |
| 306 old_cursor, new_cursor, new_text, 0U); | |
| 307 render_text_->SetCursorPosition(new_cursor); | |
| 308 } | |
| 309 ClearSelection(); | |
| 310 return changed; | |
| 311 } | |
| 312 | |
| 313 void TextfieldModel::Append(const base::string16& new_text) { | |
| 314 if (HasCompositionText()) | |
| 315 ConfirmCompositionText(); | |
| 316 size_t save = GetCursorPosition(); | |
| 317 MoveCursor(gfx::LINE_BREAK, | |
| 318 render_text_->GetVisualDirectionOfLogicalEnd(), | |
| 319 false); | |
| 320 InsertText(new_text); | |
| 321 render_text_->SetCursorPosition(save); | |
| 322 ClearSelection(); | |
| 323 } | |
| 324 | |
| 325 bool TextfieldModel::Delete() { | |
| 326 if (HasCompositionText()) { | |
| 327 // No undo/redo for composition text. | |
| 328 CancelCompositionText(); | |
| 329 return true; | |
| 330 } | |
| 331 if (HasSelection()) { | |
| 332 DeleteSelection(); | |
| 333 return true; | |
| 334 } | |
| 335 if (text().length() > GetCursorPosition()) { | |
| 336 size_t cursor_position = GetCursorPosition(); | |
| 337 size_t next_grapheme_index = render_text_->IndexOfAdjacentGrapheme( | |
| 338 cursor_position, gfx::CURSOR_FORWARD); | |
| 339 ExecuteAndRecordDelete(gfx::Range(cursor_position, next_grapheme_index), | |
| 340 true); | |
| 341 return true; | |
| 342 } | |
| 343 return false; | |
| 344 } | |
| 345 | |
| 346 bool TextfieldModel::Backspace() { | |
| 347 if (HasCompositionText()) { | |
| 348 // No undo/redo for composition text. | |
| 349 CancelCompositionText(); | |
| 350 return true; | |
| 351 } | |
| 352 if (HasSelection()) { | |
| 353 DeleteSelection(); | |
| 354 return true; | |
| 355 } | |
| 356 size_t cursor_position = GetCursorPosition(); | |
| 357 if (cursor_position > 0) { | |
| 358 // Delete one code point, which may be two UTF-16 words. | |
| 359 size_t previous_char = gfx::UTF16OffsetToIndex(text(), cursor_position, -1); | |
| 360 ExecuteAndRecordDelete(gfx::Range(cursor_position, previous_char), true); | |
| 361 return true; | |
| 362 } | |
| 363 return false; | |
| 364 } | |
| 365 | |
| 366 size_t TextfieldModel::GetCursorPosition() const { | |
| 367 return render_text_->cursor_position(); | |
| 368 } | |
| 369 | |
| 370 void TextfieldModel::MoveCursor(gfx::BreakType break_type, | |
| 371 gfx::VisualCursorDirection direction, | |
| 372 bool select) { | |
| 373 if (HasCompositionText()) | |
| 374 ConfirmCompositionText(); | |
| 375 render_text_->MoveCursor(break_type, direction, select); | |
| 376 } | |
| 377 | |
| 378 bool TextfieldModel::MoveCursorTo(const gfx::SelectionModel& cursor) { | |
| 379 if (HasCompositionText()) { | |
| 380 ConfirmCompositionText(); | |
| 381 // ConfirmCompositionText() updates cursor position. Need to reflect it in | |
| 382 // the SelectionModel parameter of MoveCursorTo(). | |
| 383 gfx::Range range(render_text_->selection().start(), cursor.caret_pos()); | |
| 384 if (!range.is_empty()) | |
| 385 return render_text_->SelectRange(range); | |
| 386 return render_text_->MoveCursorTo( | |
| 387 gfx::SelectionModel(cursor.caret_pos(), cursor.caret_affinity())); | |
| 388 } | |
| 389 return render_text_->MoveCursorTo(cursor); | |
| 390 } | |
| 391 | |
| 392 bool TextfieldModel::MoveCursorTo(const gfx::Point& point, bool select) { | |
| 393 if (HasCompositionText()) | |
| 394 ConfirmCompositionText(); | |
| 395 gfx::SelectionModel cursor = render_text_->FindCursorPosition(point); | |
| 396 if (select) | |
| 397 cursor.set_selection_start(render_text_->selection().start()); | |
| 398 return render_text_->MoveCursorTo(cursor); | |
| 399 } | |
| 400 | |
| 401 base::string16 TextfieldModel::GetSelectedText() const { | |
| 402 return text().substr(render_text_->selection().GetMin(), | |
| 403 render_text_->selection().length()); | |
| 404 } | |
| 405 | |
| 406 void TextfieldModel::SelectRange(const gfx::Range& range) { | |
| 407 if (HasCompositionText()) | |
| 408 ConfirmCompositionText(); | |
| 409 render_text_->SelectRange(range); | |
| 410 } | |
| 411 | |
| 412 void TextfieldModel::SelectSelectionModel(const gfx::SelectionModel& sel) { | |
| 413 if (HasCompositionText()) | |
| 414 ConfirmCompositionText(); | |
| 415 render_text_->MoveCursorTo(sel); | |
| 416 } | |
| 417 | |
| 418 void TextfieldModel::SelectAll(bool reversed) { | |
| 419 if (HasCompositionText()) | |
| 420 ConfirmCompositionText(); | |
| 421 render_text_->SelectAll(reversed); | |
| 422 } | |
| 423 | |
| 424 void TextfieldModel::SelectWord() { | |
| 425 if (HasCompositionText()) | |
| 426 ConfirmCompositionText(); | |
| 427 render_text_->SelectWord(); | |
| 428 } | |
| 429 | |
| 430 void TextfieldModel::ClearSelection() { | |
| 431 if (HasCompositionText()) | |
| 432 ConfirmCompositionText(); | |
| 433 render_text_->ClearSelection(); | |
| 434 } | |
| 435 | |
| 436 bool TextfieldModel::CanUndo() { | |
| 437 return edit_history_.size() && current_edit_ != edit_history_.end(); | |
| 438 } | |
| 439 | |
| 440 bool TextfieldModel::CanRedo() { | |
| 441 if (!edit_history_.size()) | |
| 442 return false; | |
| 443 // There is no redo iff the current edit is the last element in the history. | |
| 444 EditHistory::iterator iter = current_edit_; | |
| 445 return iter == edit_history_.end() || // at the top. | |
| 446 ++iter != edit_history_.end(); | |
| 447 } | |
| 448 | |
| 449 bool TextfieldModel::Undo() { | |
| 450 if (!CanUndo()) | |
| 451 return false; | |
| 452 DCHECK(!HasCompositionText()); | |
| 453 if (HasCompositionText()) | |
| 454 CancelCompositionText(); | |
| 455 | |
| 456 base::string16 old = text(); | |
| 457 size_t old_cursor = GetCursorPosition(); | |
| 458 (*current_edit_)->Commit(); | |
| 459 (*current_edit_)->Undo(this); | |
| 460 | |
| 461 if (current_edit_ == edit_history_.begin()) | |
| 462 current_edit_ = edit_history_.end(); | |
| 463 else | |
| 464 current_edit_--; | |
| 465 return old != text() || old_cursor != GetCursorPosition(); | |
| 466 } | |
| 467 | |
| 468 bool TextfieldModel::Redo() { | |
| 469 if (!CanRedo()) | |
| 470 return false; | |
| 471 DCHECK(!HasCompositionText()); | |
| 472 if (HasCompositionText()) | |
| 473 CancelCompositionText(); | |
| 474 | |
| 475 if (current_edit_ == edit_history_.end()) | |
| 476 current_edit_ = edit_history_.begin(); | |
| 477 else | |
| 478 current_edit_ ++; | |
| 479 base::string16 old = text(); | |
| 480 size_t old_cursor = GetCursorPosition(); | |
| 481 (*current_edit_)->Redo(this); | |
| 482 return old != text() || old_cursor != GetCursorPosition(); | |
| 483 } | |
| 484 | |
| 485 bool TextfieldModel::Cut() { | |
| 486 if (!HasCompositionText() && HasSelection() && !render_text_->obscured()) { | |
| 487 ui::ScopedClipboardWriter( | |
| 488 ui::CLIPBOARD_TYPE_COPY_PASTE).WriteText(GetSelectedText()); | |
| 489 // A trick to let undo/redo handle cursor correctly. | |
| 490 // Undoing CUT moves the cursor to the end of the change rather | |
| 491 // than beginning, unlike Delete/Backspace. | |
| 492 // TODO(oshima): Change Delete/Backspace to use DeleteSelection, | |
| 493 // update DeleteEdit and remove this trick. | |
| 494 const gfx::Range& selection = render_text_->selection(); | |
| 495 render_text_->SelectRange(gfx::Range(selection.end(), selection.start())); | |
| 496 DeleteSelection(); | |
| 497 return true; | |
| 498 } | |
| 499 return false; | |
| 500 } | |
| 501 | |
| 502 bool TextfieldModel::Copy() { | |
| 503 if (!HasCompositionText() && HasSelection() && !render_text_->obscured()) { | |
| 504 ui::ScopedClipboardWriter( | |
| 505 ui::CLIPBOARD_TYPE_COPY_PASTE).WriteText(GetSelectedText()); | |
| 506 return true; | |
| 507 } | |
| 508 return false; | |
| 509 } | |
| 510 | |
| 511 bool TextfieldModel::Paste() { | |
| 512 base::string16 result; | |
| 513 ui::Clipboard::GetForCurrentThread()->ReadText(ui::CLIPBOARD_TYPE_COPY_PASTE, | |
| 514 &result); | |
| 515 if (result.empty()) | |
| 516 return false; | |
| 517 | |
| 518 InsertTextInternal(result, false); | |
| 519 return true; | |
| 520 } | |
| 521 | |
| 522 bool TextfieldModel::HasSelection() const { | |
| 523 return !render_text_->selection().is_empty(); | |
| 524 } | |
| 525 | |
| 526 void TextfieldModel::DeleteSelection() { | |
| 527 DCHECK(!HasCompositionText()); | |
| 528 DCHECK(HasSelection()); | |
| 529 ExecuteAndRecordDelete(render_text_->selection(), false); | |
| 530 } | |
| 531 | |
| 532 void TextfieldModel::DeleteSelectionAndInsertTextAt( | |
| 533 const base::string16& new_text, | |
| 534 size_t position) { | |
| 535 if (HasCompositionText()) | |
| 536 CancelCompositionText(); | |
| 537 ExecuteAndRecordReplace(DO_NOT_MERGE, | |
| 538 GetCursorPosition(), | |
| 539 position + new_text.length(), | |
| 540 new_text, | |
| 541 position); | |
| 542 } | |
| 543 | |
| 544 base::string16 TextfieldModel::GetTextFromRange(const gfx::Range& range) const { | |
| 545 if (range.IsValid() && range.GetMin() < text().length()) | |
| 546 return text().substr(range.GetMin(), range.length()); | |
| 547 return base::string16(); | |
| 548 } | |
| 549 | |
| 550 void TextfieldModel::GetTextRange(gfx::Range* range) const { | |
| 551 *range = gfx::Range(0, text().length()); | |
| 552 } | |
| 553 | |
| 554 void TextfieldModel::SetCompositionText( | |
| 555 const ui::CompositionText& composition) { | |
| 556 if (HasCompositionText()) | |
| 557 CancelCompositionText(); | |
| 558 else if (HasSelection()) | |
| 559 DeleteSelection(); | |
| 560 | |
| 561 if (composition.text.empty()) | |
| 562 return; | |
| 563 | |
| 564 size_t cursor = GetCursorPosition(); | |
| 565 base::string16 new_text = text(); | |
| 566 render_text_->SetText(new_text.insert(cursor, composition.text)); | |
| 567 gfx::Range range(cursor, cursor + composition.text.length()); | |
| 568 render_text_->SetCompositionRange(range); | |
| 569 gfx::Range emphasized_range = GetFirstEmphasizedRange(composition); | |
| 570 if (emphasized_range.IsValid()) { | |
| 571 // This is a workaround due to the lack of support in RenderText to draw | |
| 572 // a thick underline. In a composition returned from an IME, the segment | |
| 573 // emphasized by a thick underline usually represents the target clause. | |
| 574 // Because the target clause is more important than the actual selection | |
| 575 // range (or caret position) in the composition here we use a selection-like | |
| 576 // marker instead to show this range. | |
| 577 // TODO(yukawa, msw): Support thick underlines and remove this workaround. | |
| 578 render_text_->SelectRange(gfx::Range( | |
| 579 cursor + emphasized_range.GetMin(), | |
| 580 cursor + emphasized_range.GetMax())); | |
| 581 } else if (!composition.selection.is_empty()) { | |
| 582 render_text_->SelectRange(gfx::Range( | |
| 583 cursor + composition.selection.GetMin(), | |
| 584 cursor + composition.selection.GetMax())); | |
| 585 } else { | |
| 586 render_text_->SetCursorPosition(cursor + composition.selection.end()); | |
| 587 } | |
| 588 } | |
| 589 | |
| 590 void TextfieldModel::ConfirmCompositionText() { | |
| 591 DCHECK(HasCompositionText()); | |
| 592 gfx::Range range = render_text_->GetCompositionRange(); | |
| 593 base::string16 composition = text().substr(range.start(), range.length()); | |
| 594 // TODO(oshima): current behavior on ChromeOS is a bit weird and not | |
| 595 // sure exactly how this should work. Find out and fix if necessary. | |
| 596 AddOrMergeEditHistory(new InsertEdit(false, composition, range.start())); | |
| 597 render_text_->SetCursorPosition(range.end()); | |
| 598 ClearComposition(); | |
| 599 if (delegate_) | |
| 600 delegate_->OnCompositionTextConfirmedOrCleared(); | |
| 601 } | |
| 602 | |
| 603 void TextfieldModel::CancelCompositionText() { | |
| 604 DCHECK(HasCompositionText()); | |
| 605 gfx::Range range = render_text_->GetCompositionRange(); | |
| 606 ClearComposition(); | |
| 607 base::string16 new_text = text(); | |
| 608 render_text_->SetText(new_text.erase(range.start(), range.length())); | |
| 609 render_text_->SetCursorPosition(range.start()); | |
| 610 if (delegate_) | |
| 611 delegate_->OnCompositionTextConfirmedOrCleared(); | |
| 612 } | |
| 613 | |
| 614 void TextfieldModel::ClearComposition() { | |
| 615 render_text_->SetCompositionRange(gfx::Range::InvalidRange()); | |
| 616 } | |
| 617 | |
| 618 void TextfieldModel::GetCompositionTextRange(gfx::Range* range) const { | |
| 619 *range = gfx::Range(render_text_->GetCompositionRange()); | |
| 620 } | |
| 621 | |
| 622 bool TextfieldModel::HasCompositionText() const { | |
| 623 return !render_text_->GetCompositionRange().is_empty(); | |
| 624 } | |
| 625 | |
| 626 void TextfieldModel::ClearEditHistory() { | |
| 627 STLDeleteElements(&edit_history_); | |
| 628 current_edit_ = edit_history_.end(); | |
| 629 } | |
| 630 | |
| 631 ///////////////////////////////////////////////////////////////// | |
| 632 // TextfieldModel: private | |
| 633 | |
| 634 void TextfieldModel::InsertTextInternal(const base::string16& new_text, | |
| 635 bool mergeable) { | |
| 636 if (HasCompositionText()) { | |
| 637 CancelCompositionText(); | |
| 638 ExecuteAndRecordInsert(new_text, mergeable); | |
| 639 } else if (HasSelection()) { | |
| 640 ExecuteAndRecordReplaceSelection(mergeable ? MERGEABLE : DO_NOT_MERGE, | |
| 641 new_text); | |
| 642 } else { | |
| 643 ExecuteAndRecordInsert(new_text, mergeable); | |
| 644 } | |
| 645 } | |
| 646 | |
| 647 void TextfieldModel::ReplaceTextInternal(const base::string16& new_text, | |
| 648 bool mergeable) { | |
| 649 if (HasCompositionText()) { | |
| 650 CancelCompositionText(); | |
| 651 } else if (!HasSelection()) { | |
| 652 size_t cursor = GetCursorPosition(); | |
| 653 const gfx::SelectionModel& model = render_text_->selection_model(); | |
| 654 // When there is no selection, the default is to replace the next grapheme | |
| 655 // with |new_text|. So, need to find the index of next grapheme first. | |
| 656 size_t next = | |
| 657 render_text_->IndexOfAdjacentGrapheme(cursor, gfx::CURSOR_FORWARD); | |
| 658 if (next == model.caret_pos()) | |
| 659 render_text_->MoveCursorTo(model); | |
| 660 else | |
| 661 render_text_->SelectRange(gfx::Range(next, model.caret_pos())); | |
| 662 } | |
| 663 // Edit history is recorded in InsertText. | |
| 664 InsertTextInternal(new_text, mergeable); | |
| 665 } | |
| 666 | |
| 667 void TextfieldModel::ClearRedoHistory() { | |
| 668 if (edit_history_.begin() == edit_history_.end()) | |
| 669 return; | |
| 670 if (current_edit_ == edit_history_.end()) { | |
| 671 ClearEditHistory(); | |
| 672 return; | |
| 673 } | |
| 674 EditHistory::iterator delete_start = current_edit_; | |
| 675 delete_start++; | |
| 676 STLDeleteContainerPointers(delete_start, edit_history_.end()); | |
| 677 edit_history_.erase(delete_start, edit_history_.end()); | |
| 678 } | |
| 679 | |
| 680 void TextfieldModel::ExecuteAndRecordDelete(gfx::Range range, bool mergeable) { | |
| 681 size_t old_text_start = range.GetMin(); | |
| 682 const base::string16 old_text = text().substr(old_text_start, range.length()); | |
| 683 bool backward = range.is_reversed(); | |
| 684 Edit* edit = new DeleteEdit(mergeable, old_text, old_text_start, backward); | |
| 685 bool delete_edit = AddOrMergeEditHistory(edit); | |
| 686 edit->Redo(this); | |
| 687 if (delete_edit) | |
| 688 delete edit; | |
| 689 } | |
| 690 | |
| 691 void TextfieldModel::ExecuteAndRecordReplaceSelection( | |
| 692 MergeType merge_type, | |
| 693 const base::string16& new_text) { | |
| 694 size_t new_text_start = render_text_->selection().GetMin(); | |
| 695 size_t new_cursor_pos = new_text_start + new_text.length(); | |
| 696 ExecuteAndRecordReplace(merge_type, | |
| 697 GetCursorPosition(), | |
| 698 new_cursor_pos, | |
| 699 new_text, | |
| 700 new_text_start); | |
| 701 } | |
| 702 | |
| 703 void TextfieldModel::ExecuteAndRecordReplace(MergeType merge_type, | |
| 704 size_t old_cursor_pos, | |
| 705 size_t new_cursor_pos, | |
| 706 const base::string16& new_text, | |
| 707 size_t new_text_start) { | |
| 708 size_t old_text_start = render_text_->selection().GetMin(); | |
| 709 bool backward = render_text_->selection().is_reversed(); | |
| 710 Edit* edit = new ReplaceEdit(merge_type, | |
| 711 GetSelectedText(), | |
| 712 old_cursor_pos, | |
| 713 old_text_start, | |
| 714 backward, | |
| 715 new_cursor_pos, | |
| 716 new_text, | |
| 717 new_text_start); | |
| 718 bool delete_edit = AddOrMergeEditHistory(edit); | |
| 719 edit->Redo(this); | |
| 720 if (delete_edit) | |
| 721 delete edit; | |
| 722 } | |
| 723 | |
| 724 void TextfieldModel::ExecuteAndRecordInsert(const base::string16& new_text, | |
| 725 bool mergeable) { | |
| 726 Edit* edit = new InsertEdit(mergeable, new_text, GetCursorPosition()); | |
| 727 bool delete_edit = AddOrMergeEditHistory(edit); | |
| 728 edit->Redo(this); | |
| 729 if (delete_edit) | |
| 730 delete edit; | |
| 731 } | |
| 732 | |
| 733 bool TextfieldModel::AddOrMergeEditHistory(Edit* edit) { | |
| 734 ClearRedoHistory(); | |
| 735 | |
| 736 if (current_edit_ != edit_history_.end() && (*current_edit_)->Merge(edit)) { | |
| 737 // If a current edit exists and has been merged with a new edit, don't add | |
| 738 // to the history, and return true to delete |edit| after redo. | |
| 739 return true; | |
| 740 } | |
| 741 edit_history_.push_back(edit); | |
| 742 if (current_edit_ == edit_history_.end()) { | |
| 743 // If there is no redoable edit, this is the 1st edit because RedoHistory | |
| 744 // has been already deleted. | |
| 745 DCHECK_EQ(1u, edit_history_.size()); | |
| 746 current_edit_ = edit_history_.begin(); | |
| 747 } else { | |
| 748 current_edit_++; | |
| 749 } | |
| 750 return false; | |
| 751 } | |
| 752 | |
| 753 void TextfieldModel::ModifyText(size_t delete_from, | |
| 754 size_t delete_to, | |
| 755 const base::string16& new_text, | |
| 756 size_t new_text_insert_at, | |
| 757 size_t new_cursor_pos) { | |
| 758 DCHECK_LE(delete_from, delete_to); | |
| 759 base::string16 old_text = text(); | |
| 760 ClearComposition(); | |
| 761 if (delete_from != delete_to) | |
| 762 render_text_->SetText(old_text.erase(delete_from, delete_to - delete_from)); | |
| 763 if (!new_text.empty()) | |
| 764 render_text_->SetText(old_text.insert(new_text_insert_at, new_text)); | |
| 765 render_text_->SetCursorPosition(new_cursor_pos); | |
| 766 // TODO(oshima): Select text that was just undone, like Mac (but not GTK). | |
| 767 } | |
| 768 | |
| 769 } // namespace views | |
| OLD | NEW |
|---|
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