Cleanup CandidateWindowView.

chrome/browser/chromeos/input_method/candidate_window_view.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 "chrome/browser/chromeos/input_method/candidate_window_view.h"
 
 #include <string>
 
-#include "ash/shell.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/input_method/candidate_view.h"
 #include "chrome/browser/chromeos/input_method/candidate_window_constants.h"
-#include "chrome/browser/chromeos/input_method/hidable_area.h"
 #include "chromeos/ime/candidate_window.h"
 #include "ui/gfx/color_utils.h"
+#include "ui/gfx/screen.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
+#include "ui/views/bubble/bubble_frame_view.h"
 #include "ui/views/controls/label.h"
-#include "ui/views/layout/grid_layout.h"
-#include "ui/views/widget/widget.h"
+#include "ui/views/corewm/window_animations.h"
+#include "ui/views/layout/box_layout.h"
+#include "ui/views/layout/fill_layout.h"
 
 namespace chromeos {
 namespace input_method {
 
 namespace {
-// VerticalCandidateLabel is used for rendering candidate text in
-// the vertical candidate window.
-class VerticalCandidateLabel : public views::Label {
+
+class CandidateWindowBorder : public views::BubbleBorder {
  public:
-  VerticalCandidateLabel() {}
+  explicit CandidateWindowBorder(gfx::NativeView parent)
+      : views::BubbleBorder(views::BubbleBorder::TOP_CENTER,
+                            views::BubbleBorder::NO_SHADOW,
+                            SK_ColorTRANSPARENT),
+        parent_(parent),
+        offset_(0) {
+    set_paint_arrow(views::BubbleBorder::PAINT_NONE);
+  }
+  virtual ~CandidateWindowBorder() {}
+
+  void set_offset(int offset) { offset_ = offset; }
 
  private:
-  virtual ~VerticalCandidateLabel() {}
+  // Overridden from views::BubbleBorder:
+  virtual gfx::Rect GetBounds(const gfx::Rect& anchor_rect,
+                              const gfx::Size& content_size) const OVERRIDE {
+    gfx::Rect bounds(content_size);
+    bounds.set_origin(gfx::Point(
+        anchor_rect.x() - offset_,
+        is_arrow_on_top(arrow()) ?
+        anchor_rect.bottom() : anchor_rect.y() - content_size.height()));
 
-  // Returns the preferred size, but guarantees that the width has at
-  // least kMinCandidateLabelWidth pixels.
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
-    gfx::Size size = Label::GetPreferredSize();
-    // Hack. +2 is needed to prevent labels from getting elided like
-    // "abc..." in some cases. TODO(satorux): Figure out why it's
-    // necessary.
-    size.set_width(size.width() + 2);
-    if (size.width() < kMinCandidateLabelWidth) {
-      size.set_width(kMinCandidateLabelWidth);
-    }
-    if (size.width() > kMaxCandidateLabelWidth) {
-      size.set_width(kMaxCandidateLabelWidth);
-    }
-    return size;
+    // It cannot use the normal logic of arrow offset for horizontal offscreen,
+    // because the arrow must be in the content's edge. But CandidateWindow has
+    // to be visible even when |anchor_rect| is out of the screen.
+    gfx::Rect work_area = gfx::Screen::GetNativeScreen()->
+        GetDisplayNearestWindow(parent_).work_area();
+    if (bounds.right() > work_area.right())
+      bounds.set_x(work_area.right() - bounds.width());
+    if (bounds.x() < work_area.x())
+      bounds.set_x(work_area.x());
+
+    return bounds;
   }
 
-  DISALLOW_COPY_AND_ASSIGN(VerticalCandidateLabel);
-};
-
-// Wraps the given view with some padding, and returns it.
-views::View* WrapWithPadding(views::View* view, const gfx::Insets& insets) {
-  views::View* wrapper = new views::View;
-  // Use GridLayout to give some insets inside.
-  views::GridLayout* layout = new views::GridLayout(wrapper);
-  wrapper->SetLayoutManager(layout);  // |wrapper| owns |layout|.
-  layout->SetInsets(insets);
-
-  views::ColumnSet* column_set = layout->AddColumnSet(0);
-  column_set->AddColumn(
-      views::GridLayout::FILL, views::GridLayout::FILL,
-      1, views::GridLayout::USE_PREF, 0, 0);
-  layout->StartRow(0, 0);
-
-  // Add the view contents.
-  layout->AddView(view);  // |view| is owned by |wraper|, not |layout|.
-  return wrapper;
-}
-
-// Creates shortcut text from the given index and the orientation.
-base::string16 CreateShortcutText(size_t index,
-                            const CandidateWindow& candidate_window) {
-  if (index >= candidate_window.candidates().size())
-    return base::string16();
-  std::string shortcut_text = candidate_window.candidates()[index].label;
-  if (!shortcut_text.empty() &&
-      candidate_window.orientation() != CandidateWindow::VERTICAL)
-    shortcut_text += '.';
-  return base::UTF8ToUTF16(shortcut_text);
-}
-
-// Creates the shortcut label, and returns it (never returns NULL).
-// The label text is not set in this function.
-views::Label* CreateShortcutLabel(
-    CandidateWindow::Orientation orientation, const ui::NativeTheme& theme) {
-  // Create the shortcut label. The label will be owned by
-  // |wrapped_shortcut_label|, hence it's deleted when
-  // |wrapped_shortcut_label| is deleted.
-  views::Label* shortcut_label = new views::Label;
-
-  if (orientation == CandidateWindow::VERTICAL) {
-    shortcut_label->SetFontList(
-        shortcut_label->font_list().DeriveFontListWithSizeDeltaAndStyle(
-            kFontSizeDelta, gfx::Font::BOLD));
-  } else {
-    shortcut_label->SetFontList(
-        shortcut_label->font_list().DeriveFontListWithSizeDelta(
-            kFontSizeDelta));
-  }
-  // TODO(satorux): Maybe we need to use language specific fonts for
-  // candidate_label, like Chinese font for Chinese input method?
-  shortcut_label->SetEnabledColor(theme.GetSystemColor(
-      ui::NativeTheme::kColorId_LabelEnabledColor));
-  shortcut_label->SetDisabledColor(theme.GetSystemColor(
-      ui::NativeTheme::kColorId_LabelDisabledColor));
-
-  return shortcut_label;
-}
-
-// Wraps the shortcut label, then decorates wrapped shortcut label
-// and returns it (never returns NULL).
-// The label text is not set in this function.
-views::View* CreateWrappedShortcutLabel(
-    views::Label* shortcut_label,
-    CandidateWindow::Orientation orientation,
-    const ui::NativeTheme& theme) {
-  // Wrap it with padding.
-  const gfx::Insets kVerticalShortcutLabelInsets(1, 6, 1, 6);
-  const gfx::Insets kHorizontalShortcutLabelInsets(1, 3, 1, 0);
-  const gfx::Insets insets =
-      (orientation == CandidateWindow::VERTICAL ?
-       kVerticalShortcutLabelInsets :
-       kHorizontalShortcutLabelInsets);
-  views::View* wrapped_shortcut_label =
-      WrapWithPadding(shortcut_label, insets);
-
-  // Add decoration based on the orientation.
-  if (orientation == CandidateWindow::VERTICAL) {
-    // Set the background color.
-    SkColor blackish = color_utils::AlphaBlend(
-        SK_ColorBLACK,
-        theme.GetSystemColor(ui::NativeTheme::kColorId_WindowBackground),
-        0x40);
-    SkColor transparent_blakish = color_utils::AlphaBlend(
-        SK_ColorTRANSPARENT, blackish, 0xE0);
-    wrapped_shortcut_label->set_background(
-        views::Background::CreateSolidBackground(transparent_blakish));
-    shortcut_label->SetBackgroundColor(
-        wrapped_shortcut_label->background()->get_color());
+  virtual gfx::Insets GetInsets() const OVERRIDE {
+    return gfx::Insets();
   }
 
-  return wrapped_shortcut_label;
-}
+  gfx::NativeView parent_;
+  int offset_;
 
-// Creates the candidate label, and returns it (never returns NULL).
-// The label text is not set in this function.
-views::Label* CreateCandidateLabel(
-    CandidateWindow::Orientation orientation) {
-  views::Label* candidate_label = NULL;
-
-  // Create the candidate label. The label will be added to |this| as a
-  // child view, hence it's deleted when |this| is deleted.
-  if (orientation == CandidateWindow::VERTICAL) {
-    candidate_label = new VerticalCandidateLabel;
-  } else {
-    candidate_label = new views::Label;
-  }
-
-  // Change the font size.
-  candidate_label->SetFontList(
-      candidate_label->font_list().DeriveFontListWithSizeDelta(kFontSizeDelta));
-  candidate_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-
-  return candidate_label;
-}
-
-// Creates the annotation label, and return it (never returns NULL).
-// The label text is not set in this function.
-views::Label* CreateAnnotationLabel(
-    CandidateWindow::Orientation orientation, const ui::NativeTheme& theme) {
-  // Create the annotation label.
-  views::Label* annotation_label = new views::Label;
-
-  // Change the font size and color.
-  annotation_label->SetFontList(
-      annotation_label->font_list().DeriveFontListWithSizeDelta(
-          kFontSizeDelta));
-  annotation_label->SetEnabledColor(theme.GetSystemColor(
-      ui::NativeTheme::kColorId_LabelDisabledColor));
-  annotation_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
-
-  return annotation_label;
-}
-
-// Computes shortcut column size.
-gfx::Size ComputeShortcutColumnSize(
-    const CandidateWindow& candidate_window,
-    const ui::NativeTheme& theme) {
-  int shortcut_column_width = 0;
-  int shortcut_column_height = 0;
-  // Create the shortcut label. The label will be owned by
-  // |wrapped_shortcut_label|, hence it's deleted when
-  // |wrapped_shortcut_label| is deleted.
-  views::Label* shortcut_label = CreateShortcutLabel(
-      candidate_window.orientation(), theme);
-  scoped_ptr<views::View> wrapped_shortcut_label(
-      CreateWrappedShortcutLabel(shortcut_label,
-                                 candidate_window.orientation(),
-                                 theme));
-
-  // Compute the max width and height in shortcut labels.
-  // We'll create temporary shortcut labels, and choose the largest width and
-  // height.
-  for (size_t i = 0; i < candidate_window.page_size(); ++i) {
-    shortcut_label->SetText(CreateShortcutText(i, candidate_window));
-    gfx::Size text_size = wrapped_shortcut_label->GetPreferredSize();
-    shortcut_column_width = std::max(shortcut_column_width, text_size.width());
-    shortcut_column_height = std::max(shortcut_column_height,
-                                      text_size.height());
-  }
-
-  return gfx::Size(shortcut_column_width, shortcut_column_height);
-}
+  DISALLOW_COPY_AND_ASSIGN(CandidateWindowBorder);
+};
 
 // Computes the page index. For instance, if the page size is 9, and the
 // cursor is pointing to 13th candidate, the page index will be 1 (2nd
 // page, as the index is zero-origin). Returns -1 on error.
 int ComputePageIndex(const CandidateWindow& candidate_window) {
   if (candidate_window.page_size() > 0)
     return candidate_window.cursor_position() / candidate_window.page_size();
   return -1;
 }
 
-// Computes candidate column size.
-gfx::Size ComputeCandidateColumnSize(
-    const CandidateWindow& candidate_window) {
-  int candidate_column_width = 0;
-  int candidate_column_height = 0;
-  scoped_ptr<views::Label> candidate_label(
-      CreateCandidateLabel(candidate_window.orientation()));
-
-  // Compute the start index of |candidate_window_|.
-  const int current_page_index = ComputePageIndex(candidate_window);
-  if (current_page_index < 0)
-    return gfx::Size(0, 0);
-  const size_t start_from = current_page_index * candidate_window.page_size();
-
-  // Compute the max width and height in candidate labels.
-  // We'll create temporary candidate labels, and choose the largest width and
-  // height.
-  for (size_t i = 0;
-       i + start_from < candidate_window.candidates().size();
-       ++i) {
-    const size_t index = start_from + i;
-
-    candidate_label->SetText(
-        base::UTF8ToUTF16(candidate_window.candidates()[index].value));
-    gfx::Size text_size = candidate_label->GetPreferredSize();
-    candidate_column_width = std::max(candidate_column_width,
-                                      text_size.width());
-    candidate_column_height = std::max(candidate_column_height,
-                                       text_size.height());
-  }
-
-  return gfx::Size(candidate_column_width, candidate_column_height);
-}
-
-// Computes annotation column size.
-gfx::Size ComputeAnnotationColumnSize(
-    const CandidateWindow& candidate_window, const ui::NativeTheme& theme) {
-  int annotation_column_width = 0;
-  int annotation_column_height = 0;
-  scoped_ptr<views::Label> annotation_label(
-      CreateAnnotationLabel(candidate_window.orientation(), theme));
-
-  // Compute the start index of |candidate_window_|.
-  const int current_page_index = ComputePageIndex(candidate_window);
-  if (current_page_index < 0)
-    return gfx::Size(0, 0);
-  const size_t start_from = current_page_index * candidate_window.page_size();
-
-  // Compute max width and height in annotation labels.
-  // We'll create temporary annotation labels, and choose the largest width and
-  // height.
-  for (size_t i = 0;
-       i + start_from < candidate_window.candidates().size();
-       ++i) {
-    const size_t index = start_from + i;
-
-    annotation_label->SetText(
-        base::UTF8ToUTF16(candidate_window.candidates()[index].annotation));
-    gfx::Size text_size = annotation_label->GetPreferredSize();
-    annotation_column_width = std::max(annotation_column_width,
-                                       text_size.width());
-    annotation_column_height = std::max(annotation_column_height,
-                                        text_size.height());
-  }
-
-  return gfx::Size(annotation_column_width, annotation_column_height);
-}
-
 }  // namespace
 
-// InformationTextArea is a HidableArea having a single Label in it.
-class InformationTextArea : public HidableArea {
+class InformationTextArea : public views::View {
  public:
+  // InformationTextArea's border is drawn as a separator, it should appear
+  // at either top or bottom.
+  enum BorderPosition {
+    TOP,
+    BOTTOM
+  };
+
   // Specify the alignment and initialize the control.
-  InformationTextArea(gfx::HorizontalAlignment align, int minWidth)
-      : minWidth_(minWidth) {
+  InformationTextArea(gfx::HorizontalAlignment align, int min_width)
+      : min_width_(min_width) {
     label_ = new views::Label;
     label_->SetHorizontalAlignment(align);
+    label_->set_border(views::Border::CreateEmptyBorder(2, 2, 2, 4));
 
-    const gfx::Insets kInsets(2, 2, 2, 4);
-    views::View* contents = WrapWithPadding(label_, kInsets);
-    SetContents(contents);
-    contents->set_border(views::Border::CreateSolidBorder(
-        1,
-        GetNativeTheme()->GetSystemColor(
-            ui::NativeTheme::kColorId_MenuBorderColor)));
-    contents->set_background(views::Background::CreateSolidBackground(
+    SetLayoutManager(new views::FillLayout());
+    AddChildView(label_);
+    set_background(views::Background::CreateSolidBackground(
         color_utils::AlphaBlend(SK_ColorBLACK,
                                 GetNativeTheme()->GetSystemColor(
                                     ui::NativeTheme::kColorId_WindowBackground),
                                 0x10)));
-    label_->SetBackgroundColor(contents->background()->get_color());
   }
 
-  // Set the displayed text.
+  // Sets the text alignment.
+  void SetAlignment(gfx::HorizontalAlignment alignment) {
+    label_->SetHorizontalAlignment(alignment);
+  }
+
+  // Sets the displayed text.
   void SetText(const std::string& utf8_text) {
     label_->SetText(base::UTF8ToUTF16(utf8_text));
   }
 
+  // Sets the border thickness for top/bottom.
+  void SetBorder(BorderPosition position) {
+    set_border(views::Border::CreateSolidSidedBorder(
+        (position == TOP) ? 1 : 0, 0, (position == BOTTOM) ? 1 : 0, 0,
+        GetNativeTheme()->GetSystemColor(
+            ui::NativeTheme::kColorId_MenuBorderColor)));
+  }
+
  protected:
   virtual gfx::Size GetPreferredSize() OVERRIDE {
-    gfx::Size size = HidableArea::GetPreferredSize();
-    // Hack. +2 is needed as the same reason as in VerticalCandidateLabel
-    size.set_width(size.width() + 2);
-    if (size.width() < minWidth_) {
-      size.set_width(minWidth_);
-    }
+    gfx::Size size = views::View::GetPreferredSize();
+    size.SetToMax(gfx::Size(min_width_, 0));
     return size;
   }
 
  private:
   views::Label* label_;
-  int minWidth_;
+  int min_width_;
 
   DISALLOW_COPY_AND_ASSIGN(InformationTextArea);
 };
 
-CandidateView::CandidateView(
-    CandidateWindowView* parent_candidate_window,
-    int index_in_page,
-    CandidateWindow::Orientation orientation)
-    : index_in_page_(index_in_page),
-      orientation_(orientation),
-      parent_candidate_window_(parent_candidate_window),
-      shortcut_label_(NULL),
-      candidate_label_(NULL),
-      annotation_label_(NULL),
-      infolist_icon_(NULL),
-      infolist_icon_enabled_(false) {
-}
-
-void CandidateView::Init(int shortcut_column_width,
-                         int candidate_column_width,
-                         int annotation_column_width,
-                         int column_height) {
-  views::GridLayout* layout = new views::GridLayout(this);
-  SetLayoutManager(layout);  // |this| owns |layout|.
-
-  // Create Labels.
-  const ui::NativeTheme& theme = *GetNativeTheme();
-  shortcut_label_ = CreateShortcutLabel(orientation_, theme);
-  views::View* wrapped_shortcut_label =
-      CreateWrappedShortcutLabel(shortcut_label_, orientation_, theme);
-  candidate_label_ = CreateCandidateLabel(orientation_);
-  annotation_label_ = CreateAnnotationLabel(orientation_, theme);
-
-  // Initialize the column set with three columns.
-  views::ColumnSet* column_set = layout->AddColumnSet(0);
-
-  // If orientation is vertical, each column width is fixed.
-  // Otherwise the width is resizable.
-  const views::GridLayout::SizeType column_type =
-      orientation_ == CandidateWindow::VERTICAL ?
-          views::GridLayout::FIXED : views::GridLayout::USE_PREF;
-
-  const int padding_column_width =
-      orientation_ == CandidateWindow::VERTICAL ? 4 : 6;
-
-  // Set shortcut column type and width.
-  column_set->AddColumn(views::GridLayout::FILL, views::GridLayout::FILL,
-                        0, column_type, shortcut_column_width, 0);
-  column_set->AddPaddingColumn(0, padding_column_width);
-
-  // Set candidate column type and width.
-  column_set->AddColumn(views::GridLayout::FILL, views::GridLayout::FILL,
-                        1, views::GridLayout::USE_PREF, 0,
-                        orientation_ == CandidateWindow::VERTICAL ?
-                        candidate_column_width : 0);
-  column_set->AddPaddingColumn(0, padding_column_width);
-
-  // Set annotation column type and width.
-  column_set->AddColumn(views::GridLayout::FILL, views::GridLayout::FILL,
-                        0, column_type, annotation_column_width, 0);
-
-  if (orientation_ == CandidateWindow::VERTICAL) {
-    column_set->AddPaddingColumn(0, 1);
-    column_set->AddColumn(views::GridLayout::FILL, views::GridLayout::FILL, 0,
-                          views::GridLayout::FIXED, kInfolistIndicatorIconWidth,
-                          0);
-    column_set->AddPaddingColumn(0, 2);
-  } else {
-    column_set->AddPaddingColumn(0, padding_column_width);
-  }
-
-  // Add the shortcut label, the candidate label, and annotation label.
-  layout->StartRow(0, 0);
-  // |wrapped_shortcut_label|, |candidate_label_|, and |annotation_label_|
-  // will be owned by |this|.
-  layout->AddView(wrapped_shortcut_label,
-                  1,  // Column span.
-                  1,  // Row span.
-                  views::GridLayout::FILL,  // Horizontal alignment.
-                  views::GridLayout::FILL,  // Vertical alignment.
-                  -1,  // Preferred width, not specified.
-                  column_height);  // Preferred height.
-  layout->AddView(candidate_label_,
-                  1,  // Column span.
-                  1,  // Row span.
-                  views::GridLayout::FILL,  // Horizontal alignment.
-                  views::GridLayout::FILL,  // Vertical alignment.
-                  -1,  // Preferred width, not specified.
-                  column_height);  // Preferred height.
-  layout->AddView(annotation_label_,
-                  1,  // Column span.
-                  1,  // Row span.
-                  views::GridLayout::FILL,  // Horizontal alignment.
-                  views::GridLayout::FILL,  // Vertical alignemnt.
-                  -1,  // Preferred width, not specified.
-                  column_height);  // Preferred height.
-  if (orientation_ == CandidateWindow::VERTICAL) {
-    infolist_icon_ = new views::View;
-    views::View* infolist_icon_wrapper = new views::View;
-    views::GridLayout* infolist_icon_layout =
-        new views::GridLayout(infolist_icon_wrapper);
-    // |infolist_icon_layout| is owned by |infolist_icon_wrapper|.
-    infolist_icon_wrapper->SetLayoutManager(infolist_icon_layout);
-    infolist_icon_layout->AddColumnSet(0)->AddColumn(
-        views::GridLayout::FILL, views::GridLayout::FILL,
-        0, views::GridLayout::FIXED, kInfolistIndicatorIconWidth, 0);
-    infolist_icon_layout->AddPaddingRow(0, kInfolistIndicatorIconPadding);
-    infolist_icon_layout->StartRow(1.0, 0);  // infolist_icon_ is resizable.
-    // |infolist_icon_| is owned by |infolist_icon_wrapper|.
-    infolist_icon_layout->AddView(infolist_icon_);
-    infolist_icon_layout->AddPaddingRow(0, kInfolistIndicatorIconPadding);
-    // |infolist_icon_wrapper| is owned by |this|.
-    layout->AddView(infolist_icon_wrapper);
-  }
-  UpdateLabelBackgroundColors();
-}
-
-void CandidateView::SetCandidateText(const base::string16& text) {
-  candidate_label_->SetText(text);
-}
-
-void CandidateView::SetShortcutText(const base::string16& text) {
-  shortcut_label_->SetText(text);
-}
-
-void CandidateView::SetAnnotationText(const base::string16& text) {
-  annotation_label_->SetText(text);
-}
-
-void CandidateView::SetInfolistIcon(bool enable) {
-  if (!infolist_icon_ || (infolist_icon_enabled_ == enable))
-    return;
-  infolist_icon_enabled_ = enable;
-  infolist_icon_->set_background(
-      enable ?
-      views::Background::CreateSolidBackground(GetNativeTheme()->GetSystemColor(
-          ui::NativeTheme::kColorId_FocusedBorderColor)) :
-      NULL);
-  UpdateLabelBackgroundColors();
-  SchedulePaint();
-}
-
-void CandidateView::Select() {
-  set_background(
-      views::Background::CreateSolidBackground(GetNativeTheme()->GetSystemColor(
-          ui::NativeTheme::kColorId_TextfieldSelectionBackgroundFocused)));
-  set_border(views::Border::CreateSolidBorder(
-      1, GetNativeTheme()->GetSystemColor(
-          ui::NativeTheme::kColorId_FocusedBorderColor)));
-  UpdateLabelBackgroundColors();
-  // Need to call SchedulePaint() for background and border color changes.
-  SchedulePaint();
-}
-
-void CandidateView::Unselect() {
-  set_background(NULL);
-  set_border(NULL);
-  UpdateLabelBackgroundColors();
-  SchedulePaint();  // See comments at Select().
-}
-
-void CandidateView::SetRowEnabled(bool enabled) {
-  shortcut_label_->SetEnabled(enabled);
-}
-
-gfx::Point CandidateView::GetCandidateLabelPosition() const {
-  return candidate_label_->GetMirroredPosition();
-}
-
-bool CandidateView::OnMousePressed(const ui::MouseEvent& event) {
-  // TODO(kinaba): On Windows and MacOS, candidate windows typically commits a
-  // candidate at OnMouseReleased event. We have chosen OnMousePressed here for
-  // working around several obstacle rising from views implementation over GTK.
-  // See: http://crosbug.com/11423#c11. Since we have moved from GTK to Aura,
-  // the reasoning should have became obsolete. We might want to reconsider
-  // implementing mouse-up selection.
-  SelectCandidateAt(event.location());
-  return false;
-}
-
-void CandidateView::OnGestureEvent(ui::GestureEvent* event) {
-  if (event->type() == ui::ET_GESTURE_TAP) {
-    SelectCandidateAt(event->location());
-    event->SetHandled();
-    return;
-  }
-  View::OnGestureEvent(event);
-}
-
-void CandidateView::SelectCandidateAt(const gfx::Point& location) {
-  gfx::Point location_in_candidate_window = location;
-  views::View::ConvertPointToTarget(this, parent_candidate_window_,
-                                    &location_in_candidate_window);
-  parent_candidate_window_->OnCandidatePressed(location_in_candidate_window);
-  parent_candidate_window_->CommitCandidate();
-}
-
-void CandidateView::UpdateLabelBackgroundColors() {
-  SkColor color = background() ?
-      background()->get_color() :
-      GetNativeTheme()->GetSystemColor(
-          ui::NativeTheme::kColorId_WindowBackground);
-  if (orientation_ != CandidateWindow::VERTICAL)
-    shortcut_label_->SetBackgroundColor(color);
-  candidate_label_->SetBackgroundColor(color);
-  annotation_label_->SetBackgroundColor(color);
-}
-
-CandidateWindowView::CandidateWindowView(views::Widget* parent_frame)
+CandidateWindowView::CandidateWindowView(gfx::NativeView parent)
     : selected_candidate_index_in_page_(-1),
-      parent_frame_(parent_frame),
-      preedit_area_(NULL),
-      header_area_(NULL),
-      candidate_area_(NULL),
-      footer_area_(NULL),
-      previous_shortcut_column_size_(0, 0),
-      previous_candidate_column_size_(0, 0),
-      previous_annotation_column_size_(0, 0),
       should_show_at_composition_head_(false),
       should_show_upper_side_(false),
       was_candidate_window_open_(false) {
+  set_parent_window(parent);
+  set_margins(gfx::Insets());
+
+  // Set the background and the border of the view.
+  ui::NativeTheme* theme = GetNativeTheme();
+  set_background(
+      views::Background::CreateSolidBackground(theme->GetSystemColor(
+          ui::NativeTheme::kColorId_WindowBackground)));
+  set_border(views::Border::CreateSolidBorder(
+      1, theme->GetSystemColor(ui::NativeTheme::kColorId_MenuBorderColor)));
+
+  SetLayoutManager(new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));
+  auxiliary_text_ = new InformationTextArea(gfx::ALIGN_RIGHT, 0);
+  preedit_ = new InformationTextArea(gfx::ALIGN_LEFT, kMinPreeditAreaWidth);
+  candidate_area_ = new views::View;
+  auxiliary_text_->SetVisible(false);
+  preedit_->SetVisible(false);
+  candidate_area_->SetVisible(false);
+  preedit_->SetBorder(InformationTextArea::BOTTOM);
+  if (candidate_window_.orientation() == CandidateWindow::VERTICAL) {
+    AddChildView(preedit_);
+    AddChildView(candidate_area_);
+    AddChildView(auxiliary_text_);
+    auxiliary_text_->SetBorder(InformationTextArea::TOP);
+    candidate_area_->SetLayoutManager(new views::BoxLayout(
+        views::BoxLayout::kVertical, 0, 0, 0));
+  } else {
+    AddChildView(preedit_);
+    AddChildView(auxiliary_text_);
+    AddChildView(candidate_area_);
+    auxiliary_text_->SetAlignment(gfx::ALIGN_LEFT);
+    auxiliary_text_->SetBorder(InformationTextArea::BOTTOM);
+    candidate_area_->SetLayoutManager(new views::BoxLayout(
+        views::BoxLayout::kHorizontal, 0, 0, 0));
+  }
 }
 
 CandidateWindowView::~CandidateWindowView() {
 }
 
-void CandidateWindowView::Init() {
-  // Set the background and the border of the view.
-  set_background(
-      views::Background::CreateSolidBackground(GetNativeTheme()->GetSystemColor(
-          ui::NativeTheme::kColorId_WindowBackground)));
-  set_border(views::Border::CreateSolidBorder(
-      1, GetNativeTheme()->GetSystemColor(
-          ui::NativeTheme::kColorId_MenuBorderColor)));
+views::Widget* CandidateWindowView::InitWidget() {
+  views::Widget* widget = BubbleDelegateView::CreateBubble(this);
 
-  // Create areas.
-  preedit_area_ = new InformationTextArea(gfx::ALIGN_LEFT,
-                                          kMinPreeditAreaWidth);
-  header_area_ = new InformationTextArea(gfx::ALIGN_LEFT, 0);
-  candidate_area_ = new HidableArea;
-  candidate_area_->SetContents(new views::View);
-  footer_area_ = new InformationTextArea(gfx::ALIGN_RIGHT, 0);
+  views::corewm::SetWindowVisibilityAnimationType(
+      widget->GetNativeView(),
+      views::corewm::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE);
 
-  // Set the window layout of the view
-  views::GridLayout* layout = new views::GridLayout(this);
-  SetLayoutManager(layout);  // |this| owns |layout|.
-  views::ColumnSet* column_set = layout->AddColumnSet(0);
-  column_set->AddColumn(views::GridLayout::FILL, views::GridLayout::FILL,
-                        0, views::GridLayout::USE_PREF, 0, 0);
-
-  // Add the preedit area
-  layout->StartRow(0, 0);
-  layout->AddView(preedit_area_);  // |preedit_area_| is owned by |this|.
-
-  // Add the header area.
-  layout->StartRow(0, 0);
-  layout->AddView(header_area_);  // |header_area_| is owned by |this|.
-
-  // Add the candidate area.
-  layout->StartRow(0, 0);
-  layout->AddView(candidate_area_);  // |candidate_area_| is owned by |this|.
-
-  // Add the footer area.
-  layout->StartRow(0, 0);
-  layout->AddView(footer_area_);  // |footer_area_| is owned by |this|.
+  GetBubbleFrameView()->SetBubbleBorder(
+      new CandidateWindowBorder(parent_window()));
+  return widget;
 }
 
-void CandidateWindowView::HideAll() {
-  parent_frame_->Hide();
-  NotifyIfCandidateWindowOpenedOrClosed();
-}
-
-void CandidateWindowView::UpdateParentArea() {
-  if (candidate_area_->IsShown() ||
-      header_area_->IsShown() ||
-      footer_area_->IsShown() ||
-      preedit_area_->IsShown()) {
-    ResizeAndMoveParentFrame();
-    parent_frame_->Show();
+void CandidateWindowView::UpdateVisibility() {
+  if (candidate_area_->visible() || auxiliary_text_->visible() ||
+      preedit_->visible()) {
+    SizeToContents();
   } else {
-    parent_frame_->Hide();
+    GetWidget()->Close();
   }
-  NotifyIfCandidateWindowOpenedOrClosed();
 }
 
 void CandidateWindowView::HideLookupTable() {
-  candidate_area_->Hide();
-  header_area_->Hide();
-  footer_area_->Hide();
-  UpdateParentArea();
+  candidate_area_->SetVisible(false);
+  UpdateVisibility();
 }
 
 void CandidateWindowView::HidePreeditText() {
-  preedit_area_->Hide();
-  UpdateParentArea();
+  preedit_->SetVisible(false);
+  UpdateVisibility();
 }
 
 void CandidateWindowView::ShowPreeditText() {
-  preedit_area_->Show();
-  UpdateParentArea();
+  preedit_->SetVisible(true);
+  UpdateVisibility();
 }
 
 void CandidateWindowView::UpdatePreeditText(const std::string& utf8_text) {
-  preedit_area_->SetText(utf8_text);
+  preedit_->SetText(utf8_text);
 }
 
 void CandidateWindowView::ShowLookupTable() {
-  if (!candidate_area_->IsShown())
-    should_show_upper_side_ = false;
-  candidate_area_->Show();
-
-  // Show auxiliary text.
-  if (!candidate_window_.is_auxiliary_text_visible()) {
-    header_area_->Hide();
-    footer_area_->Hide();
-  } else if (candidate_window_.orientation() == CandidateWindow::HORIZONTAL) {
-    header_area_->Show();
-    footer_area_->Hide();
-  } else {
-    header_area_->Hide();
-    footer_area_->Show();
-  }
-
-  UpdateParentArea();
-}
-
-void CandidateWindowView::NotifyIfCandidateWindowOpenedOrClosed() {
-  bool is_open = IsCandidateWindowOpen();
-  if (!was_candidate_window_open_ && is_open) {
-    FOR_EACH_OBSERVER(Observer, observers_, OnCandidateWindowOpened());
-  } else if (was_candidate_window_open_ && !is_open) {
-    FOR_EACH_OBSERVER(Observer, observers_, OnCandidateWindowClosed());
-  }
-  was_candidate_window_open_ = is_open;
-}
-
-bool CandidateWindowView::ShouldUpdateCandidateViews(
-    const CandidateWindow& old_candidate_window,
-    const CandidateWindow& new_candidate_window) {
-  return !old_candidate_window.IsEqual(new_candidate_window);
+  candidate_area_->SetVisible(true);
+  auxiliary_text_->SetVisible(candidate_window_.is_auxiliary_text_visible());
+  UpdateVisibility();
 }
 
 void CandidateWindowView::UpdateCandidates(
     const CandidateWindow& new_candidate_window) {
-  const bool should_update = ShouldUpdateCandidateViews(candidate_window_,
-                                                        new_candidate_window);
   // Updating the candidate views is expensive. We'll skip this if possible.
-  if (should_update) {
+  if (!candidate_window_.IsEqual(new_candidate_window)) {
+    if (candidate_window_.orientation() != new_candidate_window.orientation()) {
+      // If the new layout is vertical, the aux text should appear at the
+      // bottom. If horizontal, it should appear between preedit and candidates.
+      if (new_candidate_window.orientation() == CandidateWindow::VERTICAL) {
+        ReorderChildView(auxiliary_text_, -1);
+        auxiliary_text_->SetAlignment(gfx::ALIGN_RIGHT);
+        auxiliary_text_->SetBorder(InformationTextArea::TOP);
+        candidate_area_->SetLayoutManager(new views::BoxLayout(
+            views::BoxLayout::kVertical, 0, 0, 0));
+      } else {
+        ReorderChildView(auxiliary_text_, 1);
+        auxiliary_text_->SetAlignment(gfx::ALIGN_LEFT);
+        auxiliary_text_->SetBorder(InformationTextArea::BOTTOM);
+        candidate_area_->SetLayoutManager(new views::BoxLayout(
+            views::BoxLayout::kHorizontal, 0, 0, 0));
+      }
+    }
+
     // Initialize candidate views if necessary.
     MaybeInitializeCandidateViews(new_candidate_window);
 
     should_show_at_composition_head_
         = new_candidate_window.show_window_at_composition();
     // Compute the index of the current page.
     const int current_page_index = ComputePageIndex(new_candidate_window);
-    if (current_page_index < 0) {
+    if (current_page_index < 0)
       return;
-    }
 
     // Update the candidates in the current page.
     const size_t start_from =
         current_page_index * new_candidate_window.page_size();
 
-    // In some cases, engines send empty shortcut labels. For instance,
-    // ibus-mozc sends empty labels when they show suggestions. In this
-    // case, we should not show shortcut labels.
-    bool no_shortcut_mode = true;
-    for (size_t i = 0; i < new_candidate_window.candidates().size(); ++i) {
-      if (!new_candidate_window.candidates()[i].label.empty()) {
-        no_shortcut_mode = false;
-        break;
-      }
-    }
-
+    int max_shortcut_width = 0;
+    int max_candidate_width = 0;
     for (size_t i = 0; i < candidate_views_.size(); ++i) {
       const size_t index_in_page = i;
       const size_t candidate_index = start_from + index_in_page;
       CandidateView* candidate_view = candidate_views_[index_in_page];
-      // Set the shortcut text.
-      if (no_shortcut_mode) {
-        candidate_view->SetShortcutText(base::string16());
-      } else {
-        // At this moment, we don't use labels sent from engines for UX
-        // reasons. First, we want to show shortcut labels in empty rows
-        // (ex. show 6, 7, 8, ... in empty rows when the number of
-        // candidates is 5). Second, we want to add a period after each
-        // shortcut label when the candidate window is horizontal.
-        candidate_view->SetShortcutText(
-            CreateShortcutText(i, new_candidate_window));
-      }
       // Set the candidate text.
-       if (candidate_index < new_candidate_window.candidates().size()) {
-         const CandidateWindow::Entry& entry =
-             new_candidate_window.candidates()[candidate_index];
-         candidate_view->SetCandidateText(base::UTF8ToUTF16(entry.value));
-         candidate_view->SetAnnotationText(base::UTF8ToUTF16(entry.annotation));
-         candidate_view->SetRowEnabled(true);
-         candidate_view->SetInfolistIcon(!entry.description_title.empty());
+      if (candidate_index < new_candidate_window.candidates().size()) {
+        const CandidateWindow::Entry& entry =
+            new_candidate_window.candidates()[candidate_index];
+        candidate_view->SetEntry(entry);
+        candidate_view->SetState(views::Button::STATE_NORMAL);
+        candidate_view->SetInfolistIcon(!entry.description_title.empty());
       } else {
         // Disable the empty row.
-        candidate_view->SetCandidateText(base::string16());
-        candidate_view->SetAnnotationText(base::string16());
-        candidate_view->SetRowEnabled(false);
+        candidate_view->SetEntry(CandidateWindow::Entry());
+        candidate_view->SetState(views::Button::STATE_DISABLED);
         candidate_view->SetInfolistIcon(false);
       }
+      if (new_candidate_window.orientation() == CandidateWindow::VERTICAL) {
+        int shortcut_width = 0;
+        int candidate_width = 0;
+        candidate_views_[i]->GetPreferredWidths(
+            &shortcut_width, &candidate_width);
+        max_shortcut_width = std::max(max_shortcut_width, shortcut_width);
+        max_candidate_width = std::max(max_candidate_width, candidate_width);
+      }
     }
+    if (new_candidate_window.orientation() == CandidateWindow::VERTICAL) {
+      for (size_t i = 0; i < candidate_views_.size(); ++i)
+        candidate_views_[i]->SetWidths(max_shortcut_width, max_candidate_width);
+    }
+
+    CandidateWindowBorder* border = static_cast<CandidateWindowBorder*>(
+        GetBubbleFrameView()->bubble_border());
+    if (new_candidate_window.orientation() == CandidateWindow::VERTICAL)
+      border->set_offset(max_shortcut_width);
+    else
+      border->set_offset(0);
   }
   // Update the current candidate window. We'll use candidate_window_ from here.
   // Note that SelectCandidateAt() uses candidate_window_.
   candidate_window_.CopyFrom(new_candidate_window);
 
   // Select the current candidate in the page.
   if (candidate_window_.is_cursor_visible()) {
     if (candidate_window_.page_size()) {
       const int current_candidate_in_page =
           candidate_window_.cursor_position() % candidate_window_.page_size();
       SelectCandidateAt(current_candidate_in_page);
     }
   } else {
     // Unselect the currently selected candidate.
     if (0 <= selected_candidate_index_in_page_ &&
         static_cast<size_t>(selected_candidate_index_in_page_) <
         candidate_views_.size()) {
-      candidate_views_[selected_candidate_index_in_page_]->Unselect();
+      candidate_views_[selected_candidate_index_in_page_]->SetState(
+          views::Button::STATE_NORMAL);
       selected_candidate_index_in_page_ = -1;
     }
   }
 
   // Updates auxiliary text
-  if (candidate_window_.is_auxiliary_text_visible()) {
-    header_area_->SetText(candidate_window_.auxiliary_text());
-    footer_area_->SetText(candidate_window_.auxiliary_text());
-  }
+  auxiliary_text_->SetVisible(candidate_window_.is_auxiliary_text_visible());
+  auxiliary_text_->SetText(candidate_window_.auxiliary_text());
+}
+
+void CandidateWindowView::SetCursorBounds(const gfx::Rect& cursor_bounds,
+                                          const gfx::Rect& composition_head) {
+  if (candidate_window_.show_window_at_composition())
+    SetAnchorRect(composition_head);
+  else
+    SetAnchorRect(cursor_bounds);
 }
 
 void CandidateWindowView::MaybeInitializeCandidateViews(
     const CandidateWindow& candidate_window) {
   const CandidateWindow::Orientation orientation =
       candidate_window.orientation();
-  const int page_size = candidate_window.page_size();
-  views::View* candidate_area_contents = candidate_area_->contents();
+  const size_t page_size = candidate_window.page_size();
 
-  // Current column width.
-  gfx::Size shortcut_column_size(0, 0);
-  gfx::Size candidate_column_size(0,0);
-  gfx::Size annotation_column_size(0, 0);
+  // Reset all candidate_views_ when orientation changes.
+  if (orientation != candidate_window_.orientation())
+    STLDeleteElements(&candidate_views_);
 
-  // If orientation is horizontal, don't need to compute width,
-  // because each label is left aligned.
-  if (orientation == CandidateWindow::VERTICAL) {
-    const ui::NativeTheme& theme = *GetNativeTheme();
-    shortcut_column_size = ComputeShortcutColumnSize(candidate_window, theme);
-    candidate_column_size = ComputeCandidateColumnSize(candidate_window);
-    annotation_column_size = ComputeAnnotationColumnSize(candidate_window,
-                                                         theme);
+  while (page_size < candidate_views_.size()) {
+    delete candidate_views_.back();
+    candidate_views_.pop_back();
   }
-
-  // If the requested number of views matches the number of current views, and
-  // previous and current column width are same, just reuse these.
-  //
-  // Note that the early exit logic is not only useful for improving
-  // performance, but also necessary for the horizontal candidate window
-  // to be redrawn properly. If we get rid of the logic, the horizontal
-  // candidate window won't get redrawn properly for some reason when
-  // there is no size change. You can test this by removing "return" here
-  // and type "ni" with Pinyin input method.
-  if (static_cast<int>(candidate_views_.size()) == page_size &&
-      candidate_window_.orientation() == orientation &&
-      previous_shortcut_column_size_ == shortcut_column_size &&
-      previous_candidate_column_size_ == candidate_column_size &&
-      previous_annotation_column_size_ == annotation_column_size) {
-    return;
+  while (page_size > candidate_views_.size()) {
+    CandidateView* new_candidate = new CandidateView(this, orientation);
+    candidate_area_->AddChildView(new_candidate);
+    candidate_views_.push_back(new_candidate);
   }
-
-  // Update the previous column widths.
-  previous_shortcut_column_size_ = shortcut_column_size;
-  previous_candidate_column_size_ = candidate_column_size;
-  previous_annotation_column_size_ = annotation_column_size;
-
-  // Clear the existing candidate_views if any.
-  for (size_t i = 0; i < candidate_views_.size(); ++i) {
-    candidate_area_contents->RemoveChildView(candidate_views_[i]);
-    // Delete the view after getting out the current message loop iteration.
-    base::MessageLoop::current()->DeleteSoon(FROM_HERE, candidate_views_[i]);
-  }
-  candidate_views_.clear();
-  selected_candidate_index_in_page_ = -1;  // Invalidates the index.
-
-  views::GridLayout* layout = new views::GridLayout(candidate_area_contents);
-  // |candidate_area_contents| owns |layout|.
-  candidate_area_contents->SetLayoutManager(layout);
-  // Initialize the column set.
-  views::ColumnSet* column_set = layout->AddColumnSet(0);
-  if (orientation == CandidateWindow::VERTICAL) {
-    column_set->AddColumn(views::GridLayout::FILL,
-                          views::GridLayout::FILL,
-                          1, views::GridLayout::USE_PREF, 0, 0);
-  } else {
-    for (int i = 0; i < page_size; ++i) {
-      column_set->AddColumn(views::GridLayout::FILL,
-                            views::GridLayout::FILL,
-                            0, views::GridLayout::USE_PREF, 0, 0);
-    }
-  }
-
-  // Set insets so the border of the selected candidate is drawn inside of
-  // the border of the main candidate window, but we don't have the inset
-  // at the top and the bottom as we have the borders of the header and
-  // footer areas.
-  const gfx::Insets kCandidateAreaInsets(0, 1, 0, 1);
-  layout->SetInsets(kCandidateAreaInsets.top(),
-                    kCandidateAreaInsets.left(),
-                    kCandidateAreaInsets.bottom(),
-                    kCandidateAreaInsets.right());
-
-  // Use maximum height for all rows in candidate area.
-  const int kColumnHeight = std::max(shortcut_column_size.height(),
-                                     std::max(candidate_column_size.height(),
-                                              annotation_column_size.height()));
-
-  // Add views to the candidate area.
-  if (orientation == CandidateWindow::HORIZONTAL) {
-    layout->StartRow(0, 0);
-  }
-
-  for (int i = 0; i < page_size; ++i) {
-    CandidateView* candidate_row = new CandidateView(this, i, orientation);
-    candidate_row->Init(shortcut_column_size.width(),
-                        candidate_column_size.width(),
-                        annotation_column_size.width(),
-                        kColumnHeight);
-    candidate_views_.push_back(candidate_row);
-    if (orientation == CandidateWindow::VERTICAL) {
-      layout->StartRow(0, 0);
-    }
-    // |candidate_row| will be owned by |candidate_area_contents|.
-    layout->AddView(candidate_row,
-                    1,  // Column span.
-                    1,  // Row span.
-                    // Horizontal alignment.
-                    orientation == CandidateWindow::VERTICAL ?
-                    views::GridLayout::FILL : views::GridLayout::CENTER,
-                    views::GridLayout::CENTER,  // Vertical alignment.
-                    -1,  // Preferred width, not specified.
-                    kColumnHeight);  // Preferred height.
-  }
-
-  // Compute views size in |layout|.
-  // If we don't call this function, GetHorizontalOffset() often
-  // returns invalid value (returns 0), then candidate window
-  // moves right from the correct position in ResizeAndMoveParentFrame().
-  // TODO(nhiroki): Figure out why it returns invalid value.
-  // It seems that the x-position of the candidate labels is not set.
-  layout->Layout(candidate_area_contents);
-}
-
-bool CandidateWindowView::IsCandidateWindowOpen() const {
-  return !should_show_at_composition_head_ &&
-      candidate_area_->visible() && candidate_area_->IsShown();
 }
 
 void CandidateWindowView::SelectCandidateAt(int index_in_page) {
   const int current_page_index = ComputePageIndex(candidate_window_);
   if (current_page_index < 0) {
     return;
   }
 
   const int cursor_absolute_index =
       candidate_window_.page_size() * current_page_index + index_in_page;
   // Ignore click on out of range views.
   if (cursor_absolute_index < 0 ||
       candidate_window_.candidates().size() <=
       static_cast<size_t>(cursor_absolute_index)) {
     return;
   }
 
-  // Unselect the currently selected candidate.
-  if (0 <= selected_candidate_index_in_page_ &&
-      static_cast<size_t>(selected_candidate_index_in_page_) <
-      candidate_views_.size()) {
-    candidate_views_[selected_candidate_index_in_page_]->Unselect();
-  }
   // Remember the currently selected candidate index in the current page.
   selected_candidate_index_in_page_ = index_in_page;
 
   // Select the candidate specified by index_in_page.
-  candidate_views_[index_in_page]->Select();
+  candidate_views_[index_in_page]->SetState(views::Button::STATE_PRESSED);
 
   // Update the cursor indexes in the model.
   candidate_window_.set_cursor_position(cursor_absolute_index);
 }
 
-void CandidateWindowView::OnCandidatePressed(
-    const gfx::Point& location) {
+void CandidateWindowView::ButtonPressed(views::Button* sender,
+                                        const ui::Event& event) {
   for (size_t i = 0; i < candidate_views_.size(); ++i) {
-    gfx::Point converted_location = location;
-    views::View::ConvertPointToTarget(this, candidate_views_[i],
-                                      &converted_location);
-    if (candidate_views_[i]->HitTestPoint(converted_location)) {
-      SelectCandidateAt(i);
-      break;
+    if (sender == candidate_views_[i]) {
+      FOR_EACH_OBSERVER(Observer, observers_, OnCandidateCommitted(i));
+      return;
     }
   }
 }
 
-void CandidateWindowView::CommitCandidate() {
-  if (!(0 <= selected_candidate_index_in_page_ &&
-        static_cast<size_t>(selected_candidate_index_in_page_) <
-        candidate_views_.size())) {
-    return;  // Out of range, do nothing.
-  }
-
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnCandidateCommitted(selected_candidate_index_in_page_));
-}
-
-void CandidateWindowView::ResizeAndMoveParentFrame() {
-  // If rendering operation comes from mozc-engine, uses mozc specific bounds,
-  // otherwise candidate window is shown under the cursor.
-  const int x = should_show_at_composition_head_?
-      composition_head_bounds_.x() : cursor_bounds_.x();
-  // To avoid candidate-window overlapping, uses maximum y-position of mozc
-  // specific bounds and cursor bounds, because mozc-engine does not
-  // consider about multi-line composition.
-  const int y = should_show_at_composition_head_?
-      std::max(composition_head_bounds_.y(), cursor_bounds_.y()) :
-      cursor_bounds_.y();
-  const int height = cursor_bounds_.height();
-  const int horizontal_offset = GetHorizontalOffset();
-
-  gfx::Rect old_bounds = parent_frame_->GetClientAreaBoundsInScreen();
-  gfx::Rect screen_bounds = ash::Shell::GetScreen()->GetDisplayMatching(
-      cursor_bounds_).work_area();
-  // The size.
-  gfx::Rect frame_bounds = old_bounds;
-  frame_bounds.set_size(GetPreferredSize());
-
-  // The default position.
-  frame_bounds.set_x(x + horizontal_offset);
-  frame_bounds.set_y(y + height);
-
-  // Handle overflow at the left and the top.
-  frame_bounds.set_x(std::max(frame_bounds.x(), screen_bounds.x()));
-  frame_bounds.set_y(std::max(frame_bounds.y(), screen_bounds.y()));
-
-  // Handle overflow at the right.
-  const int right_overflow = frame_bounds.right() - screen_bounds.right();
-  if (right_overflow > 0) {
-    frame_bounds.set_x(frame_bounds.x() - right_overflow);
-  }
-
-  // Handle overflow at the bottom.
-  const int bottom_overflow = frame_bounds.bottom() - screen_bounds.bottom();
-
-  // To avoid flickering window position, the candidate window should be shown
-  // on upper side of composition string if it was shown there.
-  if (should_show_upper_side_ || bottom_overflow > 0) {
-    frame_bounds.set_y(frame_bounds.y() - height - frame_bounds.height());
-    should_show_upper_side_ = true;
-  }
-
-  // TODO(nona): check top_overflow here.
-
-  // Move the window per the cursor bounds.
-  // SetBounds() is not cheap. Only call this when it is really changed.
-  if (frame_bounds != old_bounds)
-    parent_frame_->SetBounds(frame_bounds);
-}
-
-int CandidateWindowView::GetHorizontalOffset() {
-  // Compute the horizontal offset if the candidate window is vertical.
-  if (!candidate_views_.empty() &&
-      candidate_window_.orientation() == CandidateWindow::VERTICAL) {
-    return - candidate_views_[0]->GetCandidateLabelPosition().x();
-  }
-  return 0;
-}
-
-void CandidateWindowView::VisibilityChanged(View* starting_from,
-                                            bool is_visible) {
-  if (is_visible) {
-    // If the visibility of candidate window is changed,
-    // we should move the frame to the right position.
-    ResizeAndMoveParentFrame();
-  }
-}
-
-void CandidateWindowView::OnBoundsChanged(const gfx::Rect& previous_bounds) {
-  // If the bounds(size) of candidate window is changed,
-  // we should move the frame to the right position.
-  View::OnBoundsChanged(previous_bounds);
-  ResizeAndMoveParentFrame();
-}
-
 }  // namespace input_method
 }  // namespace chromeos