ui/views/window/custom_frame_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 "ui/views/window/custom_frame_view.h"
   6
   7 #include <algorithm>
   8 #include <vector>
   9
  10 #include "base/strings/utf_string_conversions.h"
  11 #include "grit/ui_resources.h"
  12 #include "grit/ui_strings.h"
  13 #include "ui/base/hit_test.h"
  14 #include "ui/base/l10n/l10n_util.h"
  15 #include "ui/base/resource/resource_bundle.h"
  16 #include "ui/gfx/canvas.h"
  17 #include "ui/gfx/font.h"
  18 #include "ui/gfx/image/image.h"
  19 #include "ui/gfx/path.h"
  20 #include "ui/gfx/rect.h"
  21 #include "ui/views/color_constants.h"
  22 #include "ui/views/controls/button/image_button.h"
  23 #include "ui/views/views_delegate.h"
  24 #include "ui/views/widget/native_widget_private.h"
  25 #include "ui/views/widget/widget.h"
  26 #include "ui/views/widget/widget_delegate.h"
  27 #include "ui/views/window/client_view.h"
  28 #include "ui/views/window/frame_background.h"
  29 #include "ui/views/window/window_button_order_provider.h"
  30 #include "ui/views/window/window_resources.h"
  31 #include "ui/views/window/window_shape.h"
  32
  33 namespace views {
  34
  35 namespace {
  36
  37 // The frame border is only visible in restored mode and is hardcoded to 4 px on
  38 // each side regardless of the system window border size.
  39 const int kFrameBorderThickness = 4;
  40 // In the window corners, the resize areas don't actually expand bigger, but the
  41 // 16 px at the end of each edge triggers diagonal resizing.
  42 const int kResizeAreaCornerSize = 16;
  43 // The titlebar never shrinks too short to show the caption button plus some
  44 // padding below it.
  45 const int kCaptionButtonHeightWithPadding = 19;
  46 // The titlebar has a 2 px 3D edge along the top and bottom.
  47 const int kTitlebarTopAndBottomEdgeThickness = 2;
  48 // The icon is inset 2 px from the left frame border.
  49 const int kIconLeftSpacing = 2;
  50 // The icon never shrinks below 16 px on a side.
  51 const int kIconMinimumSize = 16;
  52 // The space between the window icon and the title text.
  53 const int kTitleIconOffsetX = 4;
  54 // The space between the title text and the caption buttons.
  55 const int kTitleCaptionSpacing = 5;
  56
  57 #if defined(OS_CHROMEOS)
  58 // Chrome OS uses a dark gray.
  59 const SkColor kDefaultColorFrame = SkColorSetRGB(109, 109, 109);
  60 const SkColor kDefaultColorFrameInactive = SkColorSetRGB(176, 176, 176);
  61 #else
  62 // Windows and Linux use a blue.
  63 const SkColor kDefaultColorFrame = SkColorSetRGB(66, 116, 201);
  64 const SkColor kDefaultColorFrameInactive = SkColorSetRGB(161, 182, 228);
  65 #endif
  66
  67 const gfx::FontList& GetTitleFontList() {
  68   static const gfx::FontList title_font_list =
  69       internal::NativeWidgetPrivate::GetWindowTitleFontList();
  70   return title_font_list;
  71 }
  72
  73 void LayoutButton(ImageButton* button, const gfx::Rect& bounds) {
  74   button->SetVisible(true);
  75   button->SetImageAlignment(ImageButton::ALIGN_LEFT,
  76                             ImageButton::ALIGN_BOTTOM);
  77   button->SetBoundsRect(bounds);
  78 }
  79
  80 }  // namespace
  81
  82 ///////////////////////////////////////////////////////////////////////////////
  83 // CustomFrameView, public:
  84
  85 CustomFrameView::CustomFrameView()
  86     : frame_(NULL),
  87       window_icon_(NULL),
  88       minimize_button_(NULL),
  89       maximize_button_(NULL),
  90       restore_button_(NULL),
  91       close_button_(NULL),
  92       should_show_maximize_button_(false),
  93       frame_background_(new FrameBackground()),
  94       minimum_title_bar_x_(0),
  95       maximum_title_bar_x_(-1) {
  96 }
  97
  98 CustomFrameView::~CustomFrameView() {
  99 }
 100
 101 void CustomFrameView::Init(Widget* frame) {
 102   frame_ = frame;
 103
 104   close_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_CLOSE,
 105       IDR_CLOSE, IDR_CLOSE_H, IDR_CLOSE_P);
 106   minimize_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_MINIMIZE,
 107       IDR_MINIMIZE, IDR_MINIMIZE_H, IDR_MINIMIZE_P);
 108   maximize_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_MAXIMIZE,
 109       IDR_MAXIMIZE, IDR_MAXIMIZE_H, IDR_MAXIMIZE_P);
 110   restore_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_RESTORE,
 111       IDR_RESTORE, IDR_RESTORE_H, IDR_RESTORE_P);
 112
 113   should_show_maximize_button_ = frame_->widget_delegate()->CanMaximize();
 114
 115   if (frame_->widget_delegate()->ShouldShowWindowIcon()) {
 116     window_icon_ = new ImageButton(this);
 117     AddChildView(window_icon_);
 118   }
 119 }
 120
 121 ///////////////////////////////////////////////////////////////////////////////
 122 // CustomFrameView, NonClientFrameView implementation:
 123
 124 gfx::Rect CustomFrameView::GetBoundsForClientView() const {
 125   return client_view_bounds_;
 126 }
 127
 128 gfx::Rect CustomFrameView::GetWindowBoundsForClientBounds(
 129     const gfx::Rect& client_bounds) const {
 130   int top_height = NonClientTopBorderHeight();
 131   int border_thickness = NonClientBorderThickness();
 132   return gfx::Rect(client_bounds.x() - border_thickness,
 133                    client_bounds.y() - top_height,
 134                    client_bounds.width() + (2 * border_thickness),
 135                    client_bounds.height() + top_height + border_thickness);
 136 }
 137
 138 int CustomFrameView::NonClientHitTest(const gfx::Point& point) {
 139   // Sanity check.
 140   if (!bounds().Contains(point))
 141     return HTNOWHERE;
 142
 143   int frame_component = frame_->client_view()->NonClientHitTest(point);
 144
 145   // See if we're in the sysmenu region.  (We check the ClientView first to be
 146   // consistent with OpaqueBrowserFrameView; it's not really necessary here.)
 147   gfx::Rect sysmenu_rect(IconBounds());
 148   // In maximized mode we extend the rect to the screen corner to take advantage
 149   // of Fitts' Law.
 150   if (frame_->IsMaximized())
 151     sysmenu_rect.SetRect(0, 0, sysmenu_rect.right(), sysmenu_rect.bottom());
 152   sysmenu_rect.set_x(GetMirroredXForRect(sysmenu_rect));
 153   if (sysmenu_rect.Contains(point))
 154     return (frame_component == HTCLIENT) ? HTCLIENT : HTSYSMENU;
 155
 156   if (frame_component != HTNOWHERE)
 157     return frame_component;
 158
 159   // Then see if the point is within any of the window controls.
 160   if (close_button_->GetMirroredBounds().Contains(point))
 161     return HTCLOSE;
 162   if (restore_button_->GetMirroredBounds().Contains(point))
 163     return HTMAXBUTTON;
 164   if (maximize_button_->GetMirroredBounds().Contains(point))
 165     return HTMAXBUTTON;
 166   if (minimize_button_->GetMirroredBounds().Contains(point))
 167     return HTMINBUTTON;
 168   if (window_icon_ && window_icon_->GetMirroredBounds().Contains(point))
 169     return HTSYSMENU;
 170
 171   int window_component = GetHTComponentForFrame(point, FrameBorderThickness(),
 172       NonClientBorderThickness(), kResizeAreaCornerSize, kResizeAreaCornerSize,
 173       frame_->widget_delegate()->CanResize());
 174   // Fall back to the caption if no other component matches.
 175   return (window_component == HTNOWHERE) ? HTCAPTION : window_component;
 176 }
 177
 178 void CustomFrameView::GetWindowMask(const gfx::Size& size,
 179                                     gfx::Path* window_mask) {
 180   DCHECK(window_mask);
 181   if (frame_->IsMaximized() || !ShouldShowTitleBarAndBorder())
 182     return;
 183
 184   GetDefaultWindowMask(size, window_mask);
 185 }
 186
 187 void CustomFrameView::ResetWindowControls() {
 188   restore_button_->SetState(CustomButton::STATE_NORMAL);
 189   minimize_button_->SetState(CustomButton::STATE_NORMAL);
 190   maximize_button_->SetState(CustomButton::STATE_NORMAL);
 191   // The close button isn't affected by this constraint.
 192 }
 193
 194 void CustomFrameView::UpdateWindowIcon() {
 195   if (window_icon_)
 196     window_icon_->SchedulePaint();
 197 }
 198
 199 void CustomFrameView::UpdateWindowTitle() {
 200   if (frame_->widget_delegate()->ShouldShowWindowTitle())
 201     SchedulePaintInRect(title_bounds_);
 202 }
 203
 204 ///////////////////////////////////////////////////////////////////////////////
 205 // CustomFrameView, View overrides:
 206
 207 void CustomFrameView::OnPaint(gfx::Canvas* canvas) {
 208   if (!ShouldShowTitleBarAndBorder())
 209     return;
 210
 211   if (frame_->IsMaximized())
 212     PaintMaximizedFrameBorder(canvas);
 213   else
 214     PaintRestoredFrameBorder(canvas);
 215   PaintTitleBar(canvas);
 216   if (ShouldShowClientEdge())
 217     PaintRestoredClientEdge(canvas);
 218 }
 219
 220 void CustomFrameView::Layout() {
 221   if (ShouldShowTitleBarAndBorder()) {
 222     LayoutWindowControls();
 223     LayoutTitleBar();
 224   }
 225
 226   LayoutClientView();
 227 }
 228
 229 gfx::Size CustomFrameView::GetPreferredSize() const {
 230   return frame_->non_client_view()->GetWindowBoundsForClientBounds(
 231       gfx::Rect(frame_->client_view()->GetPreferredSize())).size();
 232 }
 233
 234 gfx::Size CustomFrameView::GetMinimumSize() const {
 235   return frame_->non_client_view()->GetWindowBoundsForClientBounds(
 236       gfx::Rect(frame_->client_view()->GetMinimumSize())).size();
 237 }
 238
 239 gfx::Size CustomFrameView::GetMaximumSize() const {
 240   gfx::Size max_size = frame_->client_view()->GetMaximumSize();
 241   gfx::Size converted_size =
 242       frame_->non_client_view()->GetWindowBoundsForClientBounds(
 243           gfx::Rect(max_size)).size();
 244   return gfx::Size(max_size.width() == 0 ? 0 : converted_size.width(),
 245                    max_size.height() == 0 ? 0 : converted_size.height());
 246 }
 247
 248 ///////////////////////////////////////////////////////////////////////////////
 249 // CustomFrameView, ButtonListener implementation:
 250
 251 void CustomFrameView::ButtonPressed(Button* sender, const ui::Event& event) {
 252   if (sender == close_button_)
 253     frame_->Close();
 254   else if (sender == minimize_button_)
 255     frame_->Minimize();
 256   else if (sender == maximize_button_)
 257     frame_->Maximize();
 258   else if (sender == restore_button_)
 259     frame_->Restore();
 260 }
 261
 262 ///////////////////////////////////////////////////////////////////////////////
 263 // CustomFrameView, private:
 264
 265 int CustomFrameView::FrameBorderThickness() const {
 266   return frame_->IsMaximized() ? 0 : kFrameBorderThickness;
 267 }
 268
 269 int CustomFrameView::NonClientBorderThickness() const {
 270   // In maximized mode, we don't show a client edge.
 271   return FrameBorderThickness() +
 272       (ShouldShowClientEdge() ? kClientEdgeThickness : 0);
 273 }
 274
 275 int CustomFrameView::NonClientTopBorderHeight() const {
 276   return std::max(FrameBorderThickness() + IconSize(),
 277                   CaptionButtonY() + kCaptionButtonHeightWithPadding) +
 278       TitlebarBottomThickness();
 279 }
 280
 281 int CustomFrameView::CaptionButtonY() const {
 282   // Maximized buttons start at window top so that even if their images aren't
 283   // drawn flush with the screen edge, they still obey Fitts' Law.
 284 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 285   return FrameBorderThickness();
 286 #else
 287   return frame_->IsMaximized() ? FrameBorderThickness() : kFrameShadowThickness;
 288 #endif
 289 }
 290
 291 int CustomFrameView::TitlebarBottomThickness() const {
 292   return kTitlebarTopAndBottomEdgeThickness +
 293       (ShouldShowClientEdge() ? kClientEdgeThickness : 0);
 294 }
 295
 296 int CustomFrameView::IconSize() const {
 297 #if defined(OS_WIN)
 298   // This metric scales up if either the titlebar height or the titlebar font
 299   // size are increased.
 300   return GetSystemMetrics(SM_CYSMICON);
 301 #else
 302   return std::max(GetTitleFontList().GetHeight(), kIconMinimumSize);
 303 #endif
 304 }
 305
 306 gfx::Rect CustomFrameView::IconBounds() const {
 307   int size = IconSize();
 308   int frame_thickness = FrameBorderThickness();
 309   // Our frame border has a different "3D look" than Windows'.  Theirs has a
 310   // more complex gradient on the top that they push their icon/title below;
 311   // then the maximized window cuts this off and the icon/title are centered
 312   // in the remaining space.  Because the apparent shape of our border is
 313   // simpler, using the same positioning makes things look slightly uncentered
 314   // with restored windows, so when the window is restored, instead of
 315   // calculating the remaining space from below the frame border, we calculate
 316   // from below the 3D edge.
 317   int unavailable_px_at_top = frame_->IsMaximized() ?
 318       frame_thickness : kTitlebarTopAndBottomEdgeThickness;
 319   // When the icon is shorter than the minimum space we reserve for the caption
 320   // button, we vertically center it.  We want to bias rounding to put extra
 321   // space above the icon, since the 3D edge (+ client edge, for restored
 322   // windows) below looks (to the eye) more like additional space than does the
 323   // 3D edge (or nothing at all, for maximized windows) above; hence the +1.
 324   int y = unavailable_px_at_top + (NonClientTopBorderHeight() -
 325       unavailable_px_at_top - size - TitlebarBottomThickness() + 1) / 2;
 326   return gfx::Rect(frame_thickness + kIconLeftSpacing + minimum_title_bar_x_,
 327                    y, size, size);
 328 }
 329
 330 bool CustomFrameView::ShouldShowTitleBarAndBorder() const {
 331   if (frame_->IsFullscreen())
 332     return false;
 333
 334   if (ViewsDelegate::views_delegate) {
 335     return !ViewsDelegate::views_delegate->WindowManagerProvidesTitleBar(
 336                 frame_->IsMaximized());
 337   }
 338
 339   return true;
 340 }
 341
 342 bool CustomFrameView::ShouldShowClientEdge() const {
 343   return !frame_->IsMaximized() && ShouldShowTitleBarAndBorder();
 344 }
 345
 346 void CustomFrameView::PaintRestoredFrameBorder(gfx::Canvas* canvas) {
 347   frame_background_->set_frame_color(GetFrameColor());
 348   const gfx::ImageSkia* frame_image = GetFrameImage();
 349   frame_background_->set_theme_image(frame_image);
 350   frame_background_->set_top_area_height(frame_image->height());
 351
 352   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 353
 354   frame_background_->SetCornerImages(
 355       rb.GetImageNamed(IDR_WINDOW_TOP_LEFT_CORNER).ToImageSkia(),
 356       rb.GetImageNamed(IDR_WINDOW_TOP_RIGHT_CORNER).ToImageSkia(),
 357       rb.GetImageNamed(IDR_WINDOW_BOTTOM_LEFT_CORNER).ToImageSkia(),
 358       rb.GetImageNamed(IDR_WINDOW_BOTTOM_RIGHT_CORNER).ToImageSkia());
 359   frame_background_->SetSideImages(
 360       rb.GetImageNamed(IDR_WINDOW_LEFT_SIDE).ToImageSkia(),
 361       rb.GetImageNamed(IDR_WINDOW_TOP_CENTER).ToImageSkia(),
 362       rb.GetImageNamed(IDR_WINDOW_RIGHT_SIDE).ToImageSkia(),
 363       rb.GetImageNamed(IDR_WINDOW_BOTTOM_CENTER).ToImageSkia());
 364
 365   frame_background_->PaintRestored(canvas, this);
 366 }
 367
 368 void CustomFrameView::PaintMaximizedFrameBorder(gfx::Canvas* canvas) {
 369   const gfx::ImageSkia* frame_image = GetFrameImage();
 370   frame_background_->set_theme_image(frame_image);
 371   frame_background_->set_top_area_height(frame_image->height());
 372   frame_background_->PaintMaximized(canvas, this);
 373
 374   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 375
 376   // TODO(jamescook): Migrate this into FrameBackground.
 377   // The bottom of the titlebar actually comes from the top of the Client Edge
 378   // graphic, with the actual client edge clipped off the bottom.
 379   const gfx::ImageSkia* titlebar_bottom = rb.GetImageNamed(
 380       IDR_APP_TOP_CENTER).ToImageSkia();
 381   int edge_height = titlebar_bottom->height() -
 382       (ShouldShowClientEdge() ? kClientEdgeThickness : 0);
 383   canvas->TileImageInt(*titlebar_bottom, 0,
 384       frame_->client_view()->y() - edge_height, width(), edge_height);
 385 }
 386
 387 void CustomFrameView::PaintTitleBar(gfx::Canvas* canvas) {
 388   WidgetDelegate* delegate = frame_->widget_delegate();
 389
 390   // It seems like in some conditions we can be asked to paint after the window
 391   // that contains us is WM_DESTROYed. At this point, our delegate is NULL. The
 392   // correct long term fix may be to shut down the RootView in WM_DESTROY.
 393   if (!delegate || !delegate->ShouldShowWindowTitle())
 394     return;
 395
 396   gfx::Rect rect = title_bounds_;
 397   rect.set_x(GetMirroredXForRect(title_bounds_));
 398   canvas->DrawStringRect(delegate->GetWindowTitle(), GetTitleFontList(),
 399                          SK_ColorWHITE, rect);
 400 }
 401
 402 void CustomFrameView::PaintRestoredClientEdge(gfx::Canvas* canvas) {
 403   gfx::Rect client_area_bounds = frame_->client_view()->bounds();
 404   int client_area_top = client_area_bounds.y();
 405
 406   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 407
 408   // Top: left, center, right sides.
 409   const gfx::ImageSkia* top_left = rb.GetImageSkiaNamed(IDR_APP_TOP_LEFT);
 410   const gfx::ImageSkia* top_center = rb.GetImageSkiaNamed(IDR_APP_TOP_CENTER);
 411   const gfx::ImageSkia* top_right = rb.GetImageSkiaNamed(IDR_APP_TOP_RIGHT);
 412   int top_edge_y = client_area_top - top_center->height();
 413   canvas->DrawImageInt(*top_left,
 414                        client_area_bounds.x() - top_left->width(),
 415                        top_edge_y);
 416   canvas->TileImageInt(*top_center,
 417                        client_area_bounds.x(),
 418                        top_edge_y,
 419                        client_area_bounds.width(),
 420                        top_center->height());
 421   canvas->DrawImageInt(*top_right, client_area_bounds.right(), top_edge_y);
 422
 423   // Right side.
 424   const gfx::ImageSkia* right = rb.GetImageSkiaNamed(IDR_CONTENT_RIGHT_SIDE);
 425   int client_area_bottom =
 426       std::max(client_area_top, client_area_bounds.bottom());
 427   int client_area_height = client_area_bottom - client_area_top;
 428   canvas->TileImageInt(*right,
 429                        client_area_bounds.right(),
 430                        client_area_top,
 431                        right->width(),
 432                        client_area_height);
 433
 434   // Bottom: left, center, right sides.
 435   const gfx::ImageSkia* bottom_left =
 436       rb.GetImageSkiaNamed(IDR_CONTENT_BOTTOM_LEFT_CORNER);
 437   const gfx::ImageSkia* bottom_center =
 438       rb.GetImageSkiaNamed(IDR_CONTENT_BOTTOM_CENTER);
 439   const gfx::ImageSkia* bottom_right =
 440       rb.GetImageSkiaNamed(IDR_CONTENT_BOTTOM_RIGHT_CORNER);
 441
 442   canvas->DrawImageInt(*bottom_left,
 443                        client_area_bounds.x() - bottom_left->width(),
 444                        client_area_bottom);
 445
 446   canvas->TileImageInt(*bottom_center,
 447                        client_area_bounds.x(),
 448                        client_area_bottom,
 449                        client_area_bounds.width(),
 450                        bottom_right->height());
 451
 452   canvas->DrawImageInt(*bottom_right,
 453                        client_area_bounds.right(),
 454                        client_area_bottom);
 455   // Left side.
 456   const gfx::ImageSkia* left = rb.GetImageSkiaNamed(IDR_CONTENT_LEFT_SIDE);
 457   canvas->TileImageInt(*left,
 458                        client_area_bounds.x() - left->width(),
 459                        client_area_top,
 460                        left->width(),
 461                        client_area_height);
 462
 463   // Draw the color to fill in the edges.
 464   canvas->FillRect(gfx::Rect(client_area_bounds.x() - 1,
 465                              client_area_top - 1,
 466                              client_area_bounds.width() + 1,
 467                              client_area_bottom - client_area_top + 1),
 468                    kClientEdgeColor);
 469 }
 470
 471 SkColor CustomFrameView::GetFrameColor() const {
 472   return frame_->IsActive() ? kDefaultColorFrame : kDefaultColorFrameInactive;
 473 }
 474
 475 const gfx::ImageSkia* CustomFrameView::GetFrameImage() const {
 476   return ui::ResourceBundle::GetSharedInstance().GetImageNamed(
 477       frame_->IsActive() ? IDR_FRAME : IDR_FRAME_INACTIVE).ToImageSkia();
 478 }
 479
 480 void CustomFrameView::LayoutWindowControls() {
 481   minimum_title_bar_x_ = 0;
 482   maximum_title_bar_x_ = width();
 483
 484   if (bounds().IsEmpty())
 485     return;
 486
 487   int caption_y = CaptionButtonY();
 488   bool is_maximized = frame_->IsMaximized();
 489   // There should always be the same number of non-shadow pixels visible to the
 490   // side of the caption buttons.  In maximized mode we extend the edge button
 491   // to the screen corner to obey Fitts' Law.
 492   int extra_width = is_maximized ?
 493       (kFrameBorderThickness - kFrameShadowThickness) : 0;
 494   int next_button_x = FrameBorderThickness();
 495
 496   bool is_restored = !is_maximized && !frame_->IsMinimized();
 497   ImageButton* invisible_button = is_restored ? restore_button_
 498                                               : maximize_button_;
 499   invisible_button->SetVisible(false);
 500
 501   WindowButtonOrderProvider* button_order =
 502       WindowButtonOrderProvider::GetInstance();
 503   const std::vector<views::FrameButton>& leading_buttons =
 504       button_order->leading_buttons();
 505   const std::vector<views::FrameButton>& trailing_buttons =
 506       button_order->trailing_buttons();
 507
 508   ImageButton* button = NULL;
 509   for (std::vector<views::FrameButton>::const_iterator it =
 510            leading_buttons.begin(); it != leading_buttons.end(); ++it) {
 511     button = GetImageButton(*it);
 512     if (!button)
 513       continue;
 514     gfx::Rect target_bounds(gfx::Point(next_button_x, caption_y),
 515                             button->GetPreferredSize());
 516     if (it == leading_buttons.begin())
 517       target_bounds.set_width(target_bounds.width() + extra_width);
 518     LayoutButton(button, target_bounds);
 519     next_button_x += button->width();
 520     minimum_title_bar_x_ = std::min(width(), next_button_x);
 521   }
 522
 523   // Trailing buttions are laid out in a RTL fashion
 524   next_button_x = width() - FrameBorderThickness();
 525   for (std::vector<views::FrameButton>::const_reverse_iterator it =
 526            trailing_buttons.rbegin(); it != trailing_buttons.rend(); ++it) {
 527     button = GetImageButton(*it);
 528     if (!button)
 529       continue;
 530     gfx::Rect target_bounds(gfx::Point(next_button_x, caption_y),
 531                             button->GetPreferredSize());
 532     if (it == trailing_buttons.rbegin())
 533       target_bounds.set_width(target_bounds.width() + extra_width);
 534     target_bounds.Offset(-target_bounds.width(), 0);
 535     LayoutButton(button, target_bounds);
 536     next_button_x = button->x();
 537     maximum_title_bar_x_ = std::max(minimum_title_bar_x_, next_button_x);
 538   }
 539 }
 540
 541 void CustomFrameView::LayoutTitleBar() {
 542   DCHECK_GE(maximum_title_bar_x_, 0);
 543   // The window title position is calculated based on the icon position, even
 544   // when there is no icon.
 545   gfx::Rect icon_bounds(IconBounds());
 546   bool show_window_icon = window_icon_ != NULL;
 547   if (show_window_icon)
 548     window_icon_->SetBoundsRect(icon_bounds);
 549
 550   if (!frame_->widget_delegate()->ShouldShowWindowTitle())
 551     return;
 552
 553   // The offset between the window left edge and the title text.
 554   int title_x = show_window_icon ? icon_bounds.right() + kTitleIconOffsetX
 555                                  : icon_bounds.x();
 556   int title_height = GetTitleFontList().GetHeight();
 557   // We bias the title position so that when the difference between the icon and
 558   // title heights is odd, the extra pixel of the title is above the vertical
 559   // midline rather than below.  This compensates for how the icon is already
 560   // biased downwards (see IconBounds()) and helps prevent descenders on the
 561   // title from overlapping the 3D edge at the bottom of the titlebar.
 562   title_bounds_.SetRect(title_x,
 563       icon_bounds.y() + ((icon_bounds.height() - title_height - 1) / 2),
 564       std::max(0, maximum_title_bar_x_ - kTitleCaptionSpacing -
 565       title_x), title_height);
 566 }
 567
 568 void CustomFrameView::LayoutClientView() {
 569   if (!ShouldShowTitleBarAndBorder()) {
 570     client_view_bounds_ = bounds();
 571     return;
 572   }
 573
 574   int top_height = NonClientTopBorderHeight();
 575   int border_thickness = NonClientBorderThickness();
 576   client_view_bounds_.SetRect(border_thickness, top_height,
 577       std::max(0, width() - (2 * border_thickness)),
 578       std::max(0, height() - top_height - border_thickness));
 579 }
 580
 581 ImageButton* CustomFrameView::InitWindowCaptionButton(
 582     int accessibility_string_id,
 583     int normal_image_id,
 584     int hot_image_id,
 585     int pushed_image_id) {
 586   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 587   ImageButton* button = new ImageButton(this);
 588   button->SetAccessibleName(l10n_util::GetStringUTF16(accessibility_string_id));
 589   button->SetImage(CustomButton::STATE_NORMAL,
 590                    rb.GetImageNamed(normal_image_id).ToImageSkia());
 591   button->SetImage(CustomButton::STATE_HOVERED,
 592                    rb.GetImageNamed(hot_image_id).ToImageSkia());
 593   button->SetImage(CustomButton::STATE_PRESSED,
 594                    rb.GetImageNamed(pushed_image_id).ToImageSkia());
 595   AddChildView(button);
 596   return button;
 597 }
 598
 599 ImageButton* CustomFrameView::GetImageButton(views::FrameButton frame_button) {
 600   ImageButton* button = NULL;
 601   switch (frame_button) {
 602     case views::FRAME_BUTTON_MINIMIZE: {
 603       button = minimize_button_;
 604       break;
 605     }
 606     case views::FRAME_BUTTON_MAXIMIZE: {
 607       bool is_restored = !frame_->IsMaximized() && !frame_->IsMinimized();
 608       button = is_restored ? maximize_button_ : restore_button_;
 609       if (!should_show_maximize_button_) {
 610         // If we should not show the maximize/restore button, then we return
 611         // NULL as we don't want this button to become visible and to be laid
 612         // out.
 613         button->SetVisible(false);
 614         return NULL;
 615       }
 616       break;
 617     }
 618     case views::FRAME_BUTTON_CLOSE: {
 619       button = close_button_;
 620       break;
 621     }
 622   }
 623   return button;
 624 }
 625
 626 }  // namespace views