src/chrome/browser/ui/views/infobars/infobar_view.cc

   1 // Copyright (c) 2012 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 "chrome/browser/ui/views/infobars/infobar_view.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/strings/utf_string_conversions.h"
  11 #include "chrome/browser/ui/views/infobars/infobar_background.h"
  12 #include "components/infobars/core/infobar_delegate.h"
  13 #include "grit/generated_resources.h"
  14 #include "grit/theme_resources.h"
  15 #include "grit/ui_resources.h"
  16 #include "third_party/skia/include/effects/SkGradientShader.h"
  17 #include "ui/accessibility/ax_view_state.h"
  18 #include "ui/base/l10n/l10n_util.h"
  19 #include "ui/base/resource/resource_bundle.h"
  20 #include "ui/gfx/canvas.h"
  21 #include "ui/gfx/image/image.h"
  22 #include "ui/views/controls/button/image_button.h"
  23 #include "ui/views/controls/button/label_button.h"
  24 #include "ui/views/controls/button/label_button_border.h"
  25 #include "ui/views/controls/button/menu_button.h"
  26 #include "ui/views/controls/image_view.h"
  27 #include "ui/views/controls/label.h"
  28 #include "ui/views/controls/link.h"
  29 #include "ui/views/controls/menu/menu_runner.h"
  30 #include "ui/views/layout/layout_constants.h"
  31 #include "ui/views/widget/widget.h"
  32 #include "ui/views/window/non_client_view.h"
  33
  34
  35 // Helpers --------------------------------------------------------------------
  36
  37 namespace {
  38
  39 const int kEdgeItemPadding = views::kRelatedControlHorizontalSpacing;
  40 const int kIconToLabelSpacing = views::kRelatedControlHorizontalSpacing;
  41 const int kBeforeCloseButtonSpacing = views::kUnrelatedControlHorizontalSpacing;
  42
  43 bool SortLabelsByDecreasingWidth(views::Label* label_1, views::Label* label_2) {
  44   return label_1->GetPreferredSize().width() >
  45       label_2->GetPreferredSize().width();
  46 }
  47
  48 }  // namespace
  49
  50
  51 // InfoBar --------------------------------------------------------------------
  52
  53 // static
  54 const int infobars::InfoBar::kSeparatorLineHeight =
  55     views::NonClientFrameView::kClientEdgeThickness;
  56 const int infobars::InfoBar::kDefaultArrowTargetHeight = 9;
  57 const int infobars::InfoBar::kMaximumArrowTargetHeight = 24;
  58 const int infobars::InfoBar::kDefaultArrowTargetHalfWidth =
  59     kDefaultArrowTargetHeight;
  60 const int infobars::InfoBar::kMaximumArrowTargetHalfWidth = 14;
  61 const int infobars::InfoBar::kDefaultBarTargetHeight = 36;
  62
  63 // InfoBarView ----------------------------------------------------------------
  64
  65 // static
  66 const int InfoBarView::kButtonButtonSpacing = views::kRelatedButtonHSpacing;
  67 const int InfoBarView::kEndOfLabelSpacing = views::kItemLabelSpacing;
  68
  69 InfoBarView::InfoBarView(scoped_ptr<infobars::InfoBarDelegate> delegate)
  70     : infobars::InfoBar(delegate.Pass()),
  71       views::ExternalFocusTracker(this, NULL),
  72       icon_(NULL),
  73       close_button_(NULL) {
  74   set_owned_by_client();  // InfoBar deletes itself at the appropriate time.
  75   set_background(
  76       new InfoBarBackground(infobars::InfoBar::delegate()->GetInfoBarType()));
  77 }
  78
  79 InfoBarView::~InfoBarView() {
  80   // We should have closed any open menus in PlatformSpecificHide(), then
  81   // subclasses' RunMenu() functions should have prevented opening any new ones
  82   // once we became unowned.
  83   DCHECK(!menu_runner_.get());
  84 }
  85
  86 views::Label* InfoBarView::CreateLabel(const base::string16& text) const {
  87   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  88   views::Label* label = new views::Label(
  89       text, rb.GetFontList(ui::ResourceBundle::MediumFont));
  90   label->SizeToPreferredSize();
  91   label->SetBackgroundColor(background()->get_color());
  92   label->SetEnabledColor(SK_ColorBLACK);
  93   label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
  94   return label;
  95 }
  96
  97 views::Link* InfoBarView::CreateLink(const base::string16& text,
  98                                      views::LinkListener* listener) const {
  99   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 100   views::Link* link = new views::Link(text);
 101   link->SetFontList(rb.GetFontList(ui::ResourceBundle::MediumFont));
 102   link->SizeToPreferredSize();
 103   link->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 104   link->set_listener(listener);
 105   link->SetBackgroundColor(background()->get_color());
 106   return link;
 107 }
 108
 109 // static
 110 views::LabelButton* InfoBarView::CreateLabelButton(
 111     views::ButtonListener* listener,
 112     const base::string16& text) {
 113   scoped_ptr<views::LabelButtonBorder> label_button_border(
 114       new views::LabelButtonBorder(views::Button::STYLE_TEXTBUTTON));
 115   const int kNormalImageSet[] = IMAGE_GRID(IDR_INFOBARBUTTON_NORMAL);
 116   label_button_border->SetPainter(
 117       false, views::Button::STATE_NORMAL,
 118       views::Painter::CreateImageGridPainter(kNormalImageSet));
 119   const int kHoveredImageSet[] = IMAGE_GRID(IDR_INFOBARBUTTON_HOVER);
 120   label_button_border->SetPainter(
 121       false, views::Button::STATE_HOVERED,
 122       views::Painter::CreateImageGridPainter(kHoveredImageSet));
 123   const int kPressedImageSet[] = IMAGE_GRID(IDR_INFOBARBUTTON_PRESSED);
 124   label_button_border->SetPainter(
 125       false, views::Button::STATE_PRESSED,
 126       views::Painter::CreateImageGridPainter(kPressedImageSet));
 127
 128   views::LabelButton* label_button = new views::LabelButton(listener, text);
 129   label_button->SetBorder(label_button_border.PassAs<views::Border>());
 130   label_button->set_animate_on_state_change(false);
 131   label_button->SetTextColor(views::Button::STATE_NORMAL, SK_ColorBLACK);
 132   label_button->SetTextColor(views::Button::STATE_HOVERED, SK_ColorBLACK);
 133   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 134   label_button->SetFontList(rb.GetFontList(ui::ResourceBundle::MediumFont));
 135   label_button->SizeToPreferredSize();
 136   label_button->SetFocusable(true);
 137   return label_button;
 138 }
 139
 140 // static
 141 void InfoBarView::AssignWidths(Labels* labels, int available_width) {
 142   std::sort(labels->begin(), labels->end(), SortLabelsByDecreasingWidth);
 143   AssignWidthsSorted(labels, available_width);
 144 }
 145
 146 void InfoBarView::Layout() {
 147   // Calculate the fill and stroke paths.  We do this here, rather than in
 148   // PlatformSpecificRecalculateHeight(), because this is also reached when our
 149   // width is changed, which affects both paths.
 150   stroke_path_.rewind();
 151   fill_path_.rewind();
 152   const infobars::InfoBarContainer::Delegate* delegate = container_delegate();
 153   if (delegate) {
 154     static_cast<InfoBarBackground*>(background())->set_separator_color(
 155         delegate->GetInfoBarSeparatorColor());
 156     int arrow_x;
 157     SkScalar arrow_fill_height =
 158         SkIntToScalar(std::max(arrow_height() - kSeparatorLineHeight, 0));
 159     SkScalar arrow_fill_half_width = SkIntToScalar(arrow_half_width());
 160     SkScalar separator_height = SkIntToScalar(kSeparatorLineHeight);
 161     if (delegate->DrawInfoBarArrows(&arrow_x) && arrow_fill_height) {
 162       // Skia pixel centers are at the half-values, so the arrow is horizontally
 163       // centered at |arrow_x| + 0.5.  Vertically, the stroke path is the center
 164       // of the separator, while the fill path is a closed path that extends up
 165       // through the entire height of the separator and down to the bottom of
 166       // the arrow where it joins the bar.
 167       stroke_path_.moveTo(
 168           SkIntToScalar(arrow_x) + SK_ScalarHalf - arrow_fill_half_width,
 169           SkIntToScalar(arrow_height()) - (separator_height * SK_ScalarHalf));
 170       stroke_path_.rLineTo(arrow_fill_half_width, -arrow_fill_height);
 171       stroke_path_.rLineTo(arrow_fill_half_width, arrow_fill_height);
 172
 173       fill_path_ = stroke_path_;
 174       // Move the top of the fill path up to the top of the separator and then
 175       // extend it down all the way through.
 176       fill_path_.offset(0, -separator_height * SK_ScalarHalf);
 177       // This 0.01 hack prevents the fill from filling more pixels on the right
 178       // edge of the arrow than on the left.
 179       const SkScalar epsilon = 0.01f;
 180       fill_path_.rLineTo(-epsilon, 0);
 181       fill_path_.rLineTo(0, separator_height);
 182       fill_path_.rLineTo(epsilon - (arrow_fill_half_width * 2), 0);
 183       fill_path_.close();
 184     }
 185   }
 186   if (bar_height()) {
 187     fill_path_.addRect(0.0, SkIntToScalar(arrow_height()),
 188         SkIntToScalar(width()), SkIntToScalar(height() - kSeparatorLineHeight));
 189   }
 190
 191   int start_x = kEdgeItemPadding;
 192   if (icon_ != NULL) {
 193     icon_->SetPosition(gfx::Point(start_x, OffsetY(icon_)));
 194     start_x = icon_->bounds().right() + kIconToLabelSpacing;
 195   }
 196
 197   int content_minimum_width = ContentMinimumWidth();
 198   close_button_->SetPosition(gfx::Point(
 199       std::max(
 200           start_x + content_minimum_width +
 201               ((content_minimum_width > 0) ? kBeforeCloseButtonSpacing : 0),
 202           width() - kEdgeItemPadding - close_button_->width()),
 203       OffsetY(close_button_)));
 204 }
 205
 206 void InfoBarView::ViewHierarchyChanged(
 207     const ViewHierarchyChangedDetails& details) {
 208   View::ViewHierarchyChanged(details);
 209
 210   if (details.is_add && (details.child == this) && (close_button_ == NULL)) {
 211     gfx::Image image = delegate()->GetIcon();
 212     if (!image.IsEmpty()) {
 213       icon_ = new views::ImageView;
 214       icon_->SetImage(image.ToImageSkia());
 215       icon_->SizeToPreferredSize();
 216       AddChildView(icon_);
 217     }
 218
 219     close_button_ = new views::ImageButton(this);
 220     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 221     close_button_->SetImage(views::CustomButton::STATE_NORMAL,
 222                             rb.GetImageNamed(IDR_CLOSE_1).ToImageSkia());
 223     close_button_->SetImage(views::CustomButton::STATE_HOVERED,
 224                             rb.GetImageNamed(IDR_CLOSE_1_H).ToImageSkia());
 225     close_button_->SetImage(views::CustomButton::STATE_PRESSED,
 226                             rb.GetImageNamed(IDR_CLOSE_1_P).ToImageSkia());
 227     close_button_->SizeToPreferredSize();
 228     close_button_->SetAccessibleName(
 229         l10n_util::GetStringUTF16(IDS_ACCNAME_CLOSE));
 230     close_button_->SetFocusable(true);
 231     AddChildView(close_button_);
 232   } else if ((close_button_ != NULL) && (details.parent == this) &&
 233       (details.child != close_button_) && (close_button_->parent() == this) &&
 234       (child_at(child_count() - 1) != close_button_)) {
 235     // For accessibility, ensure the close button is the last child view.
 236     RemoveChildView(close_button_);
 237     AddChildView(close_button_);
 238   }
 239
 240   // Ensure the infobar is tall enough to display its contents.
 241   const int kMinimumVerticalPadding = 6;
 242   int height = kDefaultBarTargetHeight;
 243   for (int i = 0; i < child_count(); ++i) {
 244     const int child_height = child_at(i)->height();
 245     height = std::max(height, child_height + kMinimumVerticalPadding);
 246   }
 247   SetBarTargetHeight(height);
 248 }
 249
 250 void InfoBarView::PaintChildren(gfx::Canvas* canvas,
 251                                 const views::CullSet& cull_set) {
 252   canvas->Save();
 253
 254   // TODO(scr): This really should be the |fill_path_|, but the clipPath seems
 255   // broken on non-Windows platforms (crbug.com/75154). For now, just clip to
 256   // the bar bounds.
 257   //
 258   // canvas->sk_canvas()->clipPath(fill_path_);
 259   DCHECK_EQ(total_height(), height())
 260       << "Infobar piecewise heights do not match overall height";
 261   canvas->ClipRect(gfx::Rect(0, arrow_height(), width(), bar_height()));
 262   views::View::PaintChildren(canvas, cull_set);
 263   canvas->Restore();
 264 }
 265
 266 void InfoBarView::ButtonPressed(views::Button* sender,
 267                                 const ui::Event& event) {
 268   if (!owner())
 269     return;  // We're closing; don't call anything, it might access the owner.
 270   if (sender == close_button_) {
 271     delegate()->InfoBarDismissed();
 272     RemoveSelf();
 273   }
 274 }
 275
 276 int InfoBarView::ContentMinimumWidth() const {
 277   return 0;
 278 }
 279
 280 int InfoBarView::StartX() const {
 281   // Ensure we don't return a value greater than EndX(), so children can safely
 282   // set something's width to "EndX() - StartX()" without risking that being
 283   // negative.
 284   return std::min(EndX(), (icon_ != NULL) ?
 285       (icon_->bounds().right() + kIconToLabelSpacing) : kEdgeItemPadding);
 286 }
 287
 288 int InfoBarView::EndX() const {
 289   return close_button_->x() - kBeforeCloseButtonSpacing;
 290 }
 291
 292 int InfoBarView::OffsetY(views::View* view) const {
 293   return arrow_height() +
 294       std::max((bar_target_height() - view->height()) / 2, 0) -
 295       (bar_target_height() - bar_height());
 296 }
 297
 298 const infobars::InfoBarContainer::Delegate* InfoBarView::container_delegate()
 299     const {
 300   const infobars::InfoBarContainer* infobar_container = container();
 301   return infobar_container ? infobar_container->delegate() : NULL;
 302 }
 303
 304 void InfoBarView::RunMenuAt(ui::MenuModel* menu_model,
 305                             views::MenuButton* button,
 306                             views::MenuAnchorPosition anchor) {
 307   DCHECK(owner());  // We'd better not open any menus while we're closing.
 308   gfx::Point screen_point;
 309   views::View::ConvertPointToScreen(button, &screen_point);
 310   menu_runner_.reset(
 311       new views::MenuRunner(menu_model, views::MenuRunner::HAS_MNEMONICS));
 312   // Ignore the result since we don't need to handle a deleted menu specially.
 313   ignore_result(menu_runner_->RunMenuAt(GetWidget(),
 314                                         button,
 315                                         gfx::Rect(screen_point, button->size()),
 316                                         anchor,
 317                                         ui::MENU_SOURCE_NONE));
 318 }
 319
 320 // static
 321 void InfoBarView::AssignWidthsSorted(Labels* labels, int available_width) {
 322   if (labels->empty())
 323     return;
 324   gfx::Size back_label_size(labels->back()->GetPreferredSize());
 325   back_label_size.set_width(
 326       std::min(back_label_size.width(),
 327                available_width / static_cast<int>(labels->size())));
 328   labels->back()->SetSize(back_label_size);
 329   labels->pop_back();
 330   AssignWidthsSorted(labels, available_width - back_label_size.width());
 331 }
 332
 333 void InfoBarView::PlatformSpecificShow(bool animate) {
 334   // If we gain focus, we want to restore it to the previously-focused element
 335   // when we're hidden. So when we're in a Widget, create a focus tracker so
 336   // that if we gain focus we'll know what the previously-focused element was.
 337   SetFocusManager(GetFocusManager());
 338
 339   NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 340 }
 341
 342 void InfoBarView::PlatformSpecificHide(bool animate) {
 343   // Cancel any menus we may have open.  It doesn't make sense to leave them
 344   // open while we're hidden, and if we're going to become unowned, we can't
 345   // allow the user to choose any options and potentially call functions that
 346   // try to access the owner.
 347   menu_runner_.reset();
 348
 349   // It's possible to be called twice (once with |animate| true and once with it
 350   // false); in this case the second SetFocusManager() call will silently no-op.
 351   SetFocusManager(NULL);
 352
 353   if (!animate)
 354     return;
 355
 356   // Do not restore focus (and active state with it) if some other top-level
 357   // window became active.
 358   views::Widget* widget = GetWidget();
 359   if (!widget || widget->IsActive())
 360     FocusLastFocusedExternalView();
 361 }
 362
 363 void InfoBarView::PlatformSpecificOnHeightsRecalculated() {
 364   // Ensure that notifying our container of our size change will result in a
 365   // re-layout.
 366   InvalidateLayout();
 367 }
 368
 369 void InfoBarView::GetAccessibleState(ui::AXViewState* state) {
 370   state->name = l10n_util::GetStringUTF16(
 371       (delegate()->GetInfoBarType() ==
 372        infobars::InfoBarDelegate::WARNING_TYPE) ?
 373           IDS_ACCNAME_INFOBAR_WARNING : IDS_ACCNAME_INFOBAR_PAGE_ACTION);
 374   state->role = ui::AX_ROLE_ALERT;
 375   state->keyboard_shortcut = base::ASCIIToUTF16("Alt+Shift+A");
 376 }
 377
 378 gfx::Size InfoBarView::GetPreferredSize() const {
 379   return gfx::Size(
 380       kEdgeItemPadding + (icon_ ? (icon_->width() + kIconToLabelSpacing) : 0) +
 381           ContentMinimumWidth() + kBeforeCloseButtonSpacing +
 382           close_button_->width() + kEdgeItemPadding,
 383       total_height());
 384 }
 385
 386 void InfoBarView::OnWillChangeFocus(View* focused_before, View* focused_now) {
 387   views::ExternalFocusTracker::OnWillChangeFocus(focused_before, focused_now);
 388
 389   // This will trigger some screen readers to read the entire contents of this
 390   // infobar.
 391   if (focused_before && focused_now && !Contains(focused_before) &&
 392       Contains(focused_now)) {
 393     NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 394   }
 395 }