RenderText API Outline.

views/controls/textfield/textfield_views_model.h

 // 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.
 
 #ifndef VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 #define VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 #pragma once
 
 #include <list>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/base/ime/composition_text.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/render_text.h"
 
 namespace gfx {
+class Canvas;
 class Font;
+class RenderText;
+struct StyleRange;
 }  // namespace gfx
 
 namespace ui {
 class Range;
 }  // namespace ui
 
 namespace views {
 
-class TextStyle;
-typedef std::vector<TextStyle*> TextStyles;
-
 namespace internal {
 // Internal Edit class that keeps track of edits for undo/redo.
 class Edit;
 
-struct TextStyleRange;
-
 // C++ doesn't allow forward decl enum, so let's define here.
 enum MergeType {
   // The edit should not be merged with next edit. It still may
   // be merged with an edit with MERGE_WITH_PREVIOUS.
   DO_NOT_MERGE,
   // The edit can be merged with next edit when possible.
   MERGEABLE,
   // Does the edit have to be merged with previous edit?
   // This forces the merge even if the previous edit is marked
   // as DO_NOT_MERGE.
   MERGE_WITH_PREVIOUS,
 };
 
 }  // namespace internal
 
-typedef std::vector<internal::TextStyleRange*> TextStyleRanges;
-
 // A model that represents a text content for TextfieldViews.
 // It supports editing, selection and cursor manipulation.
 class TextfieldViewsModel {
  public:
 
   // Delegate interface implemented by the textfield view class to provided
   // additional functionalities required by the model.
   class Delegate {
    public:
     // Called when the current composition text is confirmed or cleared.
     virtual void OnCompositionTextConfirmedOrCleared() = 0;
 
    protected:
     virtual ~Delegate();
   };
 
   explicit TextfieldViewsModel(Delegate* delegate);
   virtual ~TextfieldViewsModel();
 
-  // Text fragment info. Used to draw selected text.
-  // We may replace this with TextAttribute class
-  // in the future to support multi-color text
-  // for omnibox.
-  struct TextFragment {
-    TextFragment(size_t start, size_t end, const views::TextStyle* s)
-        : range(start, end), style(s) {
-    }
-    // The start and end position of text fragment.
-    ui::Range range;
-    const TextStyle* style;
-  };
-  typedef std::vector<TextFragment> TextFragments;
-
-  // Gets the text element info.
-  void GetFragments(TextFragments* elements);
-
   void set_is_password(bool is_password) {
     is_password_ = is_password;
   }
-  const string16& text() const { return text_; }
 
   // Edit related methods.
 
-  // Sest the text. Returns true if the text has been modified.  The
+  const string16& GetText() const;
+  // Sets the text. Returns true if the text has been modified.  The
   // current composition text will be confirmed first.  Setting
   // the same text will not add edit history because it's not user
   // visible change nor user-initiated change. This allow a client
   // code to set the same text multiple times without worrying about
   // messing edit history.
   bool SetText(const string16& text);
 
+  gfx::RenderText* render_text() { return render_text_.get(); }
+
   // Inserts given |text| at the current cursor position.
   // The current composition text will be cleared.
   void InsertText(const string16& text) {
     InsertTextInternal(text, false);
   }
 
   // Inserts a character at the current cursor position.
   void InsertChar(char16 c) {
     InsertTextInternal(string16(&c, 1), true);
   }
@@ skipping 21 matching lines @@
 
   // Deletes the first character before the current cursor position (as if, the
   // the user has pressed backspace key in the textfield). Returns true if
   // the removal is successful.
   // If there is composition text, it'll be deleted instead.
   bool Backspace();
 
   // Cursor related methods.
 
   // Returns the current cursor position.
-  size_t cursor_pos() const { return cursor_pos_; }
+  size_t GetCursorPosition() const;
 
-  // Moves the cursor left by one position (as if, the user has pressed the left
-  // arrow key). If |select| is true, it updates the selection accordingly.
+  // Moves the cursor, see RenderText for additional details.
   // The current composition text will be confirmed.
-  void MoveCursorLeft(bool select);
-
-  // Moves the cursor right by one position (as if, the user has pressed the
-  // right arrow key). If |select| is true, it updates the selection
-  // accordingly.
-  // The current composition text will be confirmed.
-  void MoveCursorRight(bool select);
-
-  // Moves the cursor left by one word (word boundry is defined by space).
-  // If |select| is true, it updates the selection accordingly.
-  // The current composition text will be confirmed.
-  void MoveCursorToPreviousWord(bool select);
-
-  // Moves the cursor right by one word (word boundry is defined by space).
-  // If |select| is true, it updates the selection accordingly.
-  // The current composition text will be confirmed.
-  void MoveCursorToNextWord(bool select);
-
-  // Moves the cursor to start of the textfield contents.
-  // If |select| is true, it updates the selection accordingly.
-  // The current composition text will be confirmed.
-  void MoveCursorToHome(bool select);
-
-  // Moves the cursor to end of the textfield contents.
-  // If |select| is true, it updates the selection accordingly.
-  // The current composition text will be confirmed.
-  void MoveCursorToEnd(bool select);
+  void MoveCursorLeft(gfx::BreakType break_type, bool select);
+  void MoveCursorRight(gfx::BreakType break_type, bool select);
 
   // Moves the cursor to the specified |position|.
   // If |select| is true, it updates the selection accordingly.
   // The current composition text will be confirmed.
   bool MoveCursorTo(size_t position, bool select);
 
+  // Helper function to call MoveCursorTo on the TextfieldViewsModel.
+  bool MoveCursorTo(const gfx::Point& point, bool select);
+
   // Returns the bounds of selected text.
-  gfx::Rect GetSelectionBounds(const gfx::Font& font) const;
+  std::vector<gfx::Rect> GetSelectionBounds() const;
 
   // Selection related method
 
   // Returns the selected text.
   string16 GetSelectedText() const;
 
   void GetSelectedRange(ui::Range* range) const;
 
   // The current composition text will be confirmed. The
   // selection starts with the range's start position,
@@ skipping 20 matching lines @@
   bool CanRedo();
 
   // Undo edit. Returns true if undo changed the text.
   bool Undo();
 
   // Redo edit. Returns true if redo changed the text.
   bool Redo();
 
   // Returns visible text. If the field is password, it returns the
   // sequence of "*".
-  string16 GetVisibleText() const {
-    return GetVisibleText(0U, text_.length());
-  }
+  string16 GetVisibleText() const;
 
   // Cuts the currently selected text and puts it to clipboard. Returns true
   // if text has changed after cutting.
   bool Cut();
 
   // Copies the currently selected text and puts it to clipboard.
   void Copy();
 
   // Pastes text from the clipboard at current cursor position. Returns true
   // if text has changed after pasting.
@@ skipping 31 matching lines @@
 
   // Removes current composition text.
   void CancelCompositionText();
 
   // Retrieves the range of current composition text.
   void GetCompositionTextRange(ui::Range* range) const;
 
   // Returns true if there is composition text.
   bool HasCompositionText() const;
 
-  TextStyle* CreateTextStyle();
-
-  void ClearAllTextStyles();
-
  private:
   friend class NativeTextfieldViews;
   friend class NativeTextfieldViewsTest;
   friend class TextfieldViewsModelTest;
-  friend class TextStyle;
   friend class UndoRedo_BasicTest;
   friend class UndoRedo_CutCopyPasteTest;
   friend class UndoRedo_ReplaceTest;
   friend class internal::Edit;
 
   FRIEND_TEST_ALL_PREFIXES(TextfieldViewsModelTest, UndoRedo_BasicTest);
   FRIEND_TEST_ALL_PREFIXES(TextfieldViewsModelTest, UndoRedo_CutCopyPasteTest);
   FRIEND_TEST_ALL_PREFIXES(TextfieldViewsModelTest, UndoRedo_ReplaceTest);
-  FRIEND_TEST_ALL_PREFIXES(TextfieldViewsModelTest, TextStyleTest);
 
   // Returns the visible text given |start| and |end|.
   string16 GetVisibleText(size_t start, size_t end) const;
 
-  // Utility for SelectWord(). Checks whether position pos is at word boundary.
-  bool IsPositionAtWordSelectionBoundary(size_t pos);
-
-  // Returns the normalized cursor position that does not exceed the
-  // text length.
-  size_t GetSafePosition(size_t position) const;
-
   // Insert the given |text|. |mergeable| indicates if this insert
   // operation can be merged to previous edit in the edit history.
   void InsertTextInternal(const string16& text, bool mergeable);
 
   // Replace the current text with the given |text|. |mergeable|
   // indicates if this replace operation can be merged to previous
   // edit in the edit history.
   void ReplaceTextInternal(const string16& text, bool mergeable);
 
   // Clears all edit history.
@@ skipping 23 matching lines @@
   //    Note that the index is after deletion.
   // 3) Move the cursor to |new_cursor_pos|.
   void ModifyText(size_t delete_from,
                   size_t delete_to,
                   const string16& new_text,
                   size_t new_text_insert_at,
                   size_t new_cursor_pos);
 
   void ClearComposition();
 
-  void ApplyTextStyle(const TextStyle* style, const ui::Range& range);
-
-  static TextStyle* CreateUnderlineStyle();
-
   // Pointer to a TextfieldViewsModel::Delegate instance, should be provided by
   // the View object.
   Delegate* delegate_;
 
-  // The text in utf16 format.
-  string16 text_;
-
-  // Current cursor position.
-  size_t cursor_pos_;
-
-  // Selection range.
-  size_t selection_start_;
-
-  // Composition text range.
-  size_t composition_start_;
-  size_t composition_end_;
+  // The stylized text, cursor, selection, and the visual layout model.
+  scoped_ptr<gfx::RenderText> render_text_;
 
   // True if the text is the password.
   bool is_password_;
 
   typedef std::list<internal::Edit*> EditHistory;
   EditHistory edit_history_;
 
   // An iterator that points to the current edit that can be undone.
   // This iterator moves from the |end()|, meaining no edit to undo,
   // to the last element (one before |end()|), meaning no edit to redo.
   //  There is no edit to undo (== end()) when:
   // 1) in initial state. (nothing to undo)
   // 2) very 1st edit is undone.
   // 3) all edit history is removed.
   //  There is no edit to redo (== last element or no element) when:
   // 1) in initial state. (nothing to redo)
   // 2) new edit is added. (redo history is cleared)
   // 3) redone all undone edits.
   EditHistory::iterator current_edit_;
 
-  // This manages all styles objects.
-  TextStyles text_styles_;
-
-  // List of style ranges. Elements in the list never overlap each other.
-  // Elements are not sorted at the time of insertion, and gets sorted
-  // when it's painted (if necessary).
-  TextStyleRanges style_ranges_;
-  // True if the style_ranges_ needs to be sorted.
-  bool sort_style_ranges_;
-
-  // List of style ranges for composition text.
-  TextStyleRanges composition_style_ranges_;
-
   DISALLOW_COPY_AND_ASSIGN(TextfieldViewsModel);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_