ash/ime/candidate_view.cc

   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 "ash/ime/candidate_view.h"
   6
   7 #include "ash/ime/candidate_window_constants.h"
   8 #include "base/strings/utf_string_conversions.h"
   9 #include "ui/base/ime/candidate_window.h"
  10 #include "ui/gfx/color_utils.h"
  11 #include "ui/native_theme/native_theme.h"
  12 #include "ui/views/background.h"
  13 #include "ui/views/border.h"
  14 #include "ui/views/controls/label.h"
  15 #include "ui/views/widget/widget.h"
  16
  17 namespace ash {
  18 namespace ime {
  19
  20 namespace {
  21
  22 // VerticalCandidateLabel is used for rendering candidate text in
  23 // the vertical candidate window.
  24 class VerticalCandidateLabel : public views::Label {
  25  public:
  26   VerticalCandidateLabel() {}
  27
  28  private:
  29   virtual ~VerticalCandidateLabel() {}
  30
  31   // Returns the preferred size, but guarantees that the width has at
  32   // least kMinCandidateLabelWidth pixels.
  33   virtual gfx::Size GetPreferredSize() OVERRIDE {
  34     gfx::Size size = Label::GetPreferredSize();
  35     size.SetToMax(gfx::Size(kMinCandidateLabelWidth, 0));
  36     size.SetToMin(gfx::Size(kMaxCandidateLabelWidth, size.height()));
  37     return size;
  38   }
  39
  40   DISALLOW_COPY_AND_ASSIGN(VerticalCandidateLabel);
  41 };
  42
  43 // Creates the shortcut label, and returns it (never returns NULL).
  44 // The label text is not set in this function.
  45 views::Label* CreateShortcutLabel(
  46     ui::CandidateWindow::Orientation orientation,
  47     const ui::NativeTheme& theme) {
  48   // Create the shortcut label. The label will be owned by
  49   // |wrapped_shortcut_label|, hence it's deleted when
  50   // |wrapped_shortcut_label| is deleted.
  51   views::Label* shortcut_label = new views::Label;
  52
  53   if (orientation == ui::CandidateWindow::VERTICAL) {
  54     shortcut_label->SetFontList(
  55         shortcut_label->font_list().DeriveFontListWithSizeDeltaAndStyle(
  56             kFontSizeDelta, gfx::Font::BOLD));
  57   } else {
  58     shortcut_label->SetFontList(
  59         shortcut_label->font_list().DeriveFontListWithSizeDelta(
  60             kFontSizeDelta));
  61   }
  62   // TODO(satorux): Maybe we need to use language specific fonts for
  63   // candidate_label, like Chinese font for Chinese input method?
  64   shortcut_label->SetEnabledColor(theme.GetSystemColor(
  65       ui::NativeTheme::kColorId_LabelEnabledColor));
  66   shortcut_label->SetDisabledColor(theme.GetSystemColor(
  67       ui::NativeTheme::kColorId_LabelDisabledColor));
  68
  69   // Setup paddings.
  70   const gfx::Insets kVerticalShortcutLabelInsets(1, 6, 1, 6);
  71   const gfx::Insets kHorizontalShortcutLabelInsets(1, 3, 1, 0);
  72   const gfx::Insets insets =
  73       (orientation == ui::CandidateWindow::VERTICAL ?
  74        kVerticalShortcutLabelInsets :
  75        kHorizontalShortcutLabelInsets);
  76   shortcut_label->set_border(views::Border::CreateEmptyBorder(
  77       insets.top(), insets.left(), insets.bottom(), insets.right()));
  78
  79   // Add decoration based on the orientation.
  80   if (orientation == ui::CandidateWindow::VERTICAL) {
  81     // Set the background color.
  82     SkColor blackish = color_utils::AlphaBlend(
  83         SK_ColorBLACK,
  84         theme.GetSystemColor(ui::NativeTheme::kColorId_WindowBackground),
  85         0x40);
  86     SkColor transparent_blakish = color_utils::AlphaBlend(
  87         SK_ColorTRANSPARENT, blackish, 0xE0);
  88     shortcut_label->set_background(
  89         views::Background::CreateSolidBackground(transparent_blakish));
  90   }
  91
  92   return shortcut_label;
  93 }
  94
  95 // Creates the candidate label, and returns it (never returns NULL).
  96 // The label text is not set in this function.
  97 views::Label* CreateCandidateLabel(
  98     ui::CandidateWindow::Orientation orientation) {
  99   views::Label* candidate_label = NULL;
 100
 101   // Create the candidate label. The label will be added to |this| as a
 102   // child view, hence it's deleted when |this| is deleted.
 103   if (orientation == ui::CandidateWindow::VERTICAL) {
 104     candidate_label = new VerticalCandidateLabel;
 105   } else {
 106     candidate_label = new views::Label;
 107   }
 108
 109   // Change the font size.
 110   candidate_label->SetFontList(
 111       candidate_label->font_list().DeriveFontListWithSizeDelta(kFontSizeDelta));
 112   candidate_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 113
 114   return candidate_label;
 115 }
 116
 117 // Creates the annotation label, and return it (never returns NULL).
 118 // The label text is not set in this function.
 119 views::Label* CreateAnnotationLabel(
 120     ui::CandidateWindow::Orientation orientation,
 121     const ui::NativeTheme& theme) {
 122   // Create the annotation label.
 123   views::Label* annotation_label = new views::Label;
 124
 125   // Change the font size and color.
 126   annotation_label->SetFontList(
 127       annotation_label->font_list().DeriveFontListWithSizeDelta(
 128           kFontSizeDelta));
 129   annotation_label->SetEnabledColor(theme.GetSystemColor(
 130       ui::NativeTheme::kColorId_LabelDisabledColor));
 131   annotation_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 132
 133   return annotation_label;
 134 }
 135
 136 }  // namespace
 137
 138 CandidateView::CandidateView(
 139     views::ButtonListener* listener,
 140     ui::CandidateWindow::Orientation orientation)
 141     : views::CustomButton(listener),
 142       orientation_(orientation),
 143       shortcut_label_(NULL),
 144       candidate_label_(NULL),
 145       annotation_label_(NULL),
 146       infolist_icon_(NULL) {
 147   set_border(views::Border::CreateEmptyBorder(1, 1, 1, 1));
 148
 149   const ui::NativeTheme& theme = *GetNativeTheme();
 150   shortcut_label_ = CreateShortcutLabel(orientation, theme);
 151   candidate_label_ = CreateCandidateLabel(orientation);
 152   annotation_label_ = CreateAnnotationLabel(orientation, theme);
 153
 154   AddChildView(shortcut_label_);
 155   AddChildView(candidate_label_);
 156   AddChildView(annotation_label_);
 157
 158   if (orientation == ui::CandidateWindow::VERTICAL) {
 159     infolist_icon_ = new views::View;
 160     infolist_icon_->set_background(
 161         views::Background::CreateSolidBackground(theme.GetSystemColor(
 162             ui::NativeTheme::kColorId_FocusedBorderColor)));
 163     AddChildView(infolist_icon_);
 164   }
 165 }
 166
 167 void CandidateView::GetPreferredWidths(int* shortcut_width,
 168                                        int* candidate_width) {
 169   *shortcut_width = shortcut_label_->GetPreferredSize().width();
 170   *candidate_width = candidate_label_->GetPreferredSize().width();
 171 }
 172
 173 void CandidateView::SetWidths(int shortcut_width, int candidate_width) {
 174   shortcut_width_ = shortcut_width;
 175   shortcut_label_->SetVisible(shortcut_width_ != 0);
 176   candidate_width_ = candidate_width;
 177 }
 178
 179 void CandidateView::SetEntry(const ui::CandidateWindow::Entry& entry) {
 180   std::string label = entry.label;
 181   if (!label.empty() && orientation_ != ui::CandidateWindow::VERTICAL)
 182     label += '.';
 183   shortcut_label_->SetText(base::UTF8ToUTF16(label));
 184   candidate_label_->SetText(base::UTF8ToUTF16(entry.value));
 185   annotation_label_->SetText(base::UTF8ToUTF16(entry.annotation));
 186 }
 187
 188 void CandidateView::SetInfolistIcon(bool enable) {
 189   if (infolist_icon_)
 190     infolist_icon_->SetVisible(enable);
 191   SchedulePaint();
 192 }
 193
 194 void CandidateView::StateChanged() {
 195   shortcut_label_->SetEnabled(state() != STATE_DISABLED);
 196   if (state() == STATE_PRESSED) {
 197     ui::NativeTheme* theme = GetNativeTheme();
 198     set_background(
 199         views::Background::CreateSolidBackground(theme->GetSystemColor(
 200             ui::NativeTheme::kColorId_TextfieldSelectionBackgroundFocused)));
 201     set_border(views::Border::CreateSolidBorder(
 202         1, theme->GetSystemColor(
 203             ui::NativeTheme::kColorId_FocusedBorderColor)));
 204
 205     // Cancel currently focused one.
 206     for (int i = 0; i < parent()->child_count(); ++i) {
 207       CandidateView* view =
 208           static_cast<CandidateView*>((parent()->child_at(i)));
 209       if (view != this && view->state() == STATE_PRESSED)
 210         view->SetState(STATE_NORMAL);
 211     }
 212   } else {
 213     set_background(NULL);
 214     set_border(views::Border::CreateEmptyBorder(1, 1, 1, 1));
 215   }
 216 }
 217
 218 bool CandidateView::OnMouseDragged(const ui::MouseEvent& event) {
 219   if (!HitTestPoint(event.location())) {
 220     // Moves the drag target to the sibling view.
 221     gfx::Point location_in_widget(event.location());
 222     ConvertPointToWidget(this, &location_in_widget);
 223     for (int i = 0; i < parent()->child_count(); ++i) {
 224       views::View* sibling = parent()->child_at(i);
 225       if (sibling == this)
 226         continue;
 227       gfx::Point location_in_sibling(location_in_widget);
 228       ConvertPointFromWidget(sibling, &location_in_sibling);
 229       if (sibling->HitTestPoint(location_in_sibling)) {
 230         GetWidget()->GetRootView()->SetMouseHandler(sibling);
 231         return sibling->OnMouseDragged(event);
 232       }
 233     }
 234
 235     return false;
 236   }
 237
 238   return views::CustomButton::OnMouseDragged(event);
 239 }
 240
 241 void CandidateView::Layout() {
 242   const int padding_width =
 243       orientation_ == ui::CandidateWindow::VERTICAL ? 4 : 6;
 244   int x = 0;
 245   shortcut_label_->SetBounds(x, 0, shortcut_width_, height());
 246   if (shortcut_width_ > 0)
 247     x += shortcut_width_ + padding_width;
 248   candidate_label_->SetBounds(x, 0, candidate_width_, height());
 249   x += candidate_width_ + padding_width;
 250
 251   int right = bounds().right();
 252   if (infolist_icon_ && infolist_icon_->visible()) {
 253     infolist_icon_->SetBounds(
 254         right - kInfolistIndicatorIconWidth - kInfolistIndicatorIconPadding,
 255         kInfolistIndicatorIconPadding,
 256         kInfolistIndicatorIconWidth,
 257         height() - kInfolistIndicatorIconPadding * 2);
 258     right -= kInfolistIndicatorIconWidth + kInfolistIndicatorIconPadding * 2;
 259   }
 260   annotation_label_->SetBounds(x, 0, right - x, height());
 261 }
 262
 263 gfx::Size CandidateView::GetPreferredSize() {
 264   const int padding_width =
 265       orientation_ == ui::CandidateWindow::VERTICAL ? 4 : 6;
 266   gfx::Size size;
 267   if (shortcut_label_->visible()) {
 268     size = shortcut_label_->GetPreferredSize();
 269     size.SetToMax(gfx::Size(shortcut_width_, 0));
 270     size.Enlarge(padding_width, 0);
 271   }
 272   gfx::Size candidate_size = candidate_label_->GetPreferredSize();
 273   candidate_size.SetToMax(gfx::Size(candidate_width_, 0));
 274   size.Enlarge(candidate_size.width() + padding_width, 0);
 275   size.SetToMax(candidate_size);
 276   if (annotation_label_->visible()) {
 277     gfx::Size annotation_size = annotation_label_->GetPreferredSize();
 278     size.Enlarge(annotation_size.width() + padding_width, 0);
 279     size.SetToMax(annotation_size);
 280   }
 281
 282   // Reserves the margin for infolist_icon even if it's not visible.
 283   size.Enlarge(
 284       kInfolistIndicatorIconWidth + kInfolistIndicatorIconPadding * 2, 0);
 285   return size;
 286 }
 287
 288 }  // namespace ime
 289 }  // namespace ash