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 "ui/base/hit_test.h"
  12 #include "ui/base/l10n/l10n_util.h"
  13 #include "ui/base/resource/resource_bundle.h"
  14 #include "ui/gfx/canvas.h"
  15 #include "ui/gfx/font.h"
  16 #include "ui/gfx/geometry/rect.h"
  17 #include "ui/gfx/image/image.h"
  18 #include "ui/gfx/path.h"
  19 #include "ui/resources/grit/ui_resources.h"
  20 #include "ui/strings/grit/ui_strings.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       frame_background_(new FrameBackground()),
  93       minimum_title_bar_x_(0),
  94       maximum_title_bar_x_(-1) {
  95 }
  96
  97 CustomFrameView::~CustomFrameView() {
  98 }
  99
 100 void CustomFrameView::Init(Widget* frame) {
 101   frame_ = frame;
 102
 103   close_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_CLOSE,
 104       IDR_CLOSE, IDR_CLOSE_H, IDR_CLOSE_P);
 105   minimize_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_MINIMIZE,
 106       IDR_MINIMIZE, IDR_MINIMIZE_H, IDR_MINIMIZE_P);
 107   maximize_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_MAXIMIZE,
 108       IDR_MAXIMIZE, IDR_MAXIMIZE_H, IDR_MAXIMIZE_P);
 109   restore_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_RESTORE,
 110       IDR_RESTORE, IDR_RESTORE_H, IDR_RESTORE_P);
 111
 112   if (frame_->widget_delegate()->ShouldShowWindowIcon()) {
 113     window_icon_ = new ImageButton(this);
 114     AddChildView(window_icon_);
 115   }
 116 }
 117
 118 ///////////////////////////////////////////////////////////////////////////////
 119 // CustomFrameView, NonClientFrameView implementation:
 120
 121 gfx::Rect CustomFrameView::GetBoundsForClientView() const {
 122   return client_view_bounds_;
 123 }
 124
 125 gfx::Rect CustomFrameView::GetWindowBoundsForClientBounds(
 126     const gfx::Rect& client_bounds) const {
 127   int top_height = NonClientTopBorderHeight();
 128   int border_thickness = NonClientBorderThickness();
 129   return gfx::Rect(client_bounds.x() - border_thickness,
 130                    client_bounds.y() - top_height,
 131                    client_bounds.width() + (2 * border_thickness),
 132                    client_bounds.height() + top_height + border_thickness);
 133 }
 134
 135 int CustomFrameView::NonClientHitTest(const gfx::Point& point) {
 136   // Sanity check.
 137   if (!bounds().Contains(point))
 138     return HTNOWHERE;
 139
 140   int frame_component = frame_->client_view()->NonClientHitTest(point);
 141
 142   // See if we're in the sysmenu region.  (We check the ClientView first to be
 143   // consistent with OpaqueBrowserFrameView; it's not really necessary here.)
 144   gfx::Rect sysmenu_rect(IconBounds());
 145   // In maximized mode we extend the rect to the screen corner to take advantage
 146   // of Fitts' Law.
 147   if (frame_->IsMaximized())
 148     sysmenu_rect.SetRect(0, 0, sysmenu_rect.right(), sysmenu_rect.bottom());
 149   sysmenu_rect.set_x(GetMirroredXForRect(sysmenu_rect));
 150   if (sysmenu_rect.Contains(point))
 151     return (frame_component == HTCLIENT) ? HTCLIENT : HTSYSMENU;
 152
 153   if (frame_component != HTNOWHERE)
 154     return frame_component;
 155
 156   // Then see if the point is within any of the window controls.
 157   if (close_button_->GetMirroredBounds().Contains(point))
 158     return HTCLOSE;
 159   if (restore_button_->GetMirroredBounds().Contains(point))
 160     return HTMAXBUTTON;
 161   if (maximize_button_->GetMirroredBounds().Contains(point))
 162     return HTMAXBUTTON;
 163   if (minimize_button_->GetMirroredBounds().Contains(point))
 164     return HTMINBUTTON;
 165   if (window_icon_ && window_icon_->GetMirroredBounds().Contains(point))
 166     return HTSYSMENU;
 167
 168   int window_component = GetHTComponentForFrame(point, FrameBorderThickness(),
 169       NonClientBorderThickness(), kResizeAreaCornerSize, kResizeAreaCornerSize,
 170       frame_->widget_delegate()->CanResize());
 171   // Fall back to the caption if no other component matches.
 172   return (window_component == HTNOWHERE) ? HTCAPTION : window_component;
 173 }
 174
 175 void CustomFrameView::GetWindowMask(const gfx::Size& size,
 176                                     gfx::Path* window_mask) {
 177   DCHECK(window_mask);
 178   if (frame_->IsMaximized() || !ShouldShowTitleBarAndBorder())
 179     return;
 180
 181   GetDefaultWindowMask(size, window_mask);
 182 }
 183
 184 void CustomFrameView::ResetWindowControls() {
 185   restore_button_->SetState(CustomButton::STATE_NORMAL);
 186   minimize_button_->SetState(CustomButton::STATE_NORMAL);
 187   maximize_button_->SetState(CustomButton::STATE_NORMAL);
 188   // The close button isn't affected by this constraint.
 189 }
 190
 191 void CustomFrameView::UpdateWindowIcon() {
 192   if (window_icon_)
 193     window_icon_->SchedulePaint();
 194 }
 195
 196 void CustomFrameView::UpdateWindowTitle() {
 197   if (frame_->widget_delegate()->ShouldShowWindowTitle())
 198     SchedulePaintInRect(title_bounds_);
 199 }
 200
 201 void CustomFrameView::SizeConstraintsChanged() {
 202   ResetWindowControls();
 203   LayoutWindowControls();
 204 }
 205
 206 ///////////////////////////////////////////////////////////////////////////////
 207 // CustomFrameView, View overrides:
 208
 209 void CustomFrameView::OnPaint(gfx::Canvas* canvas) {
 210   if (!ShouldShowTitleBarAndBorder())
 211     return;
 212
 213   if (frame_->IsMaximized())
 214     PaintMaximizedFrameBorder(canvas);
 215   else
 216     PaintRestoredFrameBorder(canvas);
 217   PaintTitleBar(canvas);
 218   if (ShouldShowClientEdge())
 219     PaintRestoredClientEdge(canvas);
 220 }
 221
 222 void CustomFrameView::Layout() {
 223   if (ShouldShowTitleBarAndBorder()) {
 224     LayoutWindowControls();
 225     LayoutTitleBar();
 226   }
 227
 228   LayoutClientView();
 229 }
 230
 231 gfx::Size CustomFrameView::GetPreferredSize() const {
 232   return frame_->non_client_view()->GetWindowBoundsForClientBounds(
 233       gfx::Rect(frame_->client_view()->GetPreferredSize())).size();
 234 }
 235
 236 gfx::Size CustomFrameView::GetMinimumSize() const {
 237   return frame_->non_client_view()->GetWindowBoundsForClientBounds(
 238       gfx::Rect(frame_->client_view()->GetMinimumSize())).size();
 239 }
 240
 241 gfx::Size CustomFrameView::GetMaximumSize() const {
 242   gfx::Size max_size = frame_->client_view()->GetMaximumSize();
 243   gfx::Size converted_size =
 244       frame_->non_client_view()->GetWindowBoundsForClientBounds(
 245           gfx::Rect(max_size)).size();
 246   return gfx::Size(max_size.width() == 0 ? 0 : converted_size.width(),
 247                    max_size.height() == 0 ? 0 : converted_size.height());
 248 }
 249
 250 ///////////////////////////////////////////////////////////////////////////////
 251 // CustomFrameView, ButtonListener implementation:
 252
 253 void CustomFrameView::ButtonPressed(Button* sender, const ui::Event& event) {
 254   if (sender == close_button_)
 255     frame_->Close();
 256   else if (sender == minimize_button_)
 257     frame_->Minimize();
 258   else if (sender == maximize_button_)
 259     frame_->Maximize();
 260   else if (sender == restore_button_)
 261     frame_->Restore();
 262 }
 263
 264 ///////////////////////////////////////////////////////////////////////////////
 265 // CustomFrameView, private:
 266
 267 int CustomFrameView::FrameBorderThickness() const {
 268   return frame_->IsMaximized() ? 0 : kFrameBorderThickness;
 269 }
 270
 271 int CustomFrameView::NonClientBorderThickness() const {
 272   // In maximized mode, we don't show a client edge.
 273   return FrameBorderThickness() +
 274       (ShouldShowClientEdge() ? kClientEdgeThickness : 0);
 275 }
 276
 277 int CustomFrameView::NonClientTopBorderHeight() const {
 278   return std::max(FrameBorderThickness() + IconSize(),
 279                   CaptionButtonY() + kCaptionButtonHeightWithPadding) +
 280       TitlebarBottomThickness();
 281 }
 282
 283 int CustomFrameView::CaptionButtonY() const {
 284   // Maximized buttons start at window top so that even if their images aren't
 285   // drawn flush with the screen edge, they still obey Fitts' Law.
 286 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 287   return FrameBorderThickness();
 288 #else
 289   return frame_->IsMaximized() ? FrameBorderThickness() : kFrameShadowThickness;
 290 #endif
 291 }
 292
 293 int CustomFrameView::TitlebarBottomThickness() const {
 294   return kTitlebarTopAndBottomEdgeThickness +
 295       (ShouldShowClientEdge() ? kClientEdgeThickness : 0);
 296 }
 297
 298 int CustomFrameView::IconSize() const {
 299 #if defined(OS_WIN)
 300   // This metric scales up if either the titlebar height or the titlebar font
 301   // size are increased.
 302   return GetSystemMetrics(SM_CYSMICON);
 303 #else
 304   return std::max(GetTitleFontList().GetHeight(), kIconMinimumSize);
 305 #endif
 306 }
 307
 308 gfx::Rect CustomFrameView::IconBounds() const {
 309   int size = IconSize();
 310   int frame_thickness = FrameBorderThickness();
 311   // Our frame border has a different "3D look" than Windows'.  Theirs has a
 312   // more complex gradient on the top that they push their icon/title below;
 313   // then the maximized window cuts this off and the icon/title are centered
 314   // in the remaining space.  Because the apparent shape of our border is
 315   // simpler, using the same positioning makes things look slightly uncentered
 316   // with restored windows, so when the window is restored, instead of
 317   // calculating the remaining space from below the frame border, we calculate
 318   // from below the 3D edge.
 319   int unavailable_px_at_top = frame_->IsMaximized() ?
 320       frame_thickness : kTitlebarTopAndBottomEdgeThickness;
 321   // When the icon is shorter than the minimum space we reserve for the caption
 322   // button, we vertically center it.  We want to bias rounding to put extra
 323   // space above the icon, since the 3D edge (+ client edge, for restored
 324   // windows) below looks (to the eye) more like additional space than does the
 325   // 3D edge (or nothing at all, for maximized windows) above; hence the +1.
 326   int y = unavailable_px_at_top + (NonClientTopBorderHeight() -
 327       unavailable_px_at_top - size - TitlebarBottomThickness() + 1) / 2;
 328   return gfx::Rect(frame_thickness + kIconLeftSpacing + minimum_title_bar_x_,
 329                    y, size, size);
 330 }
 331
 332 bool CustomFrameView::ShouldShowTitleBarAndBorder() const {
 333   if (frame_->IsFullscreen())
 334     return false;
 335
 336   if (ViewsDelegate::views_delegate) {
 337     return !ViewsDelegate::views_delegate->WindowManagerProvidesTitleBar(
 338                 frame_->IsMaximized());
 339   }
 340
 341   return true;
 342 }
 343
 344 bool CustomFrameView::ShouldShowClientEdge() const {
 345   return !frame_->IsMaximized() && ShouldShowTitleBarAndBorder();
 346 }
 347
 348 void CustomFrameView::PaintRestoredFrameBorder(gfx::Canvas* canvas) {
 349   frame_background_->set_frame_color(GetFrameColor());
 350   const gfx::ImageSkia* frame_image = GetFrameImage();
 351   frame_background_->set_theme_image(frame_image);
 352   frame_background_->set_top_area_height(frame_image->height());
 353
 354   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 355
 356   frame_background_->SetCornerImages(
 357       rb.GetImageNamed(IDR_WINDOW_TOP_LEFT_CORNER).ToImageSkia(),
 358       rb.GetImageNamed(IDR_WINDOW_TOP_RIGHT_CORNER).ToImageSkia(),
 359       rb.GetImageNamed(IDR_WINDOW_BOTTOM_LEFT_CORNER).ToImageSkia(),
 360       rb.GetImageNamed(IDR_WINDOW_BOTTOM_RIGHT_CORNER).ToImageSkia());
 361   frame_background_->SetSideImages(
 362       rb.GetImageNamed(IDR_WINDOW_LEFT_SIDE).ToImageSkia(),
 363       rb.GetImageNamed(IDR_WINDOW_TOP_CENTER).ToImageSkia(),
 364       rb.GetImageNamed(IDR_WINDOW_RIGHT_SIDE).ToImageSkia(),
 365       rb.GetImageNamed(IDR_WINDOW_BOTTOM_CENTER).ToImageSkia());
 366
 367   frame_background_->PaintRestored(canvas, this);
 368 }
 369
 370 void CustomFrameView::PaintMaximizedFrameBorder(gfx::Canvas* canvas) {
 371   const gfx::ImageSkia* frame_image = GetFrameImage();
 372   frame_background_->set_theme_image(frame_image);
 373   frame_background_->set_top_area_height(frame_image->height());
 374   frame_background_->PaintMaximized(canvas, this);
 375
 376   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 377
 378   // TODO(jamescook): Migrate this into FrameBackground.
 379   // The bottom of the titlebar actually comes from the top of the Client Edge
 380   // graphic, with the actual client edge clipped off the bottom.
 381   const gfx::ImageSkia* titlebar_bottom = rb.GetImageNamed(
 382       IDR_APP_TOP_CENTER).ToImageSkia();
 383   int edge_height = titlebar_bottom->height() -
 384       (ShouldShowClientEdge() ? kClientEdgeThickness : 0);
 385   canvas->TileImageInt(*titlebar_bottom, 0,
 386       frame_->client_view()->y() - edge_height, width(), edge_height);
 387 }
 388
 389 void CustomFrameView::PaintTitleBar(gfx::Canvas* canvas) {
 390   WidgetDelegate* delegate = frame_->widget_delegate();
 391
 392   // It seems like in some conditions we can be asked to paint after the window
 393   // that contains us is WM_DESTROYed. At this point, our delegate is NULL. The
 394   // correct long term fix may be to shut down the RootView in WM_DESTROY.
 395   if (!delegate || !delegate->ShouldShowWindowTitle())
 396     return;
 397
 398   gfx::Rect rect = title_bounds_;
 399   rect.set_x(GetMirroredXForRect(title_bounds_));
 400   canvas->DrawStringRect(delegate->GetWindowTitle(), GetTitleFontList(),
 401                          SK_ColorWHITE, rect);
 402 }
 403
 404 void CustomFrameView::PaintRestoredClientEdge(gfx::Canvas* canvas) {
 405   gfx::Rect client_area_bounds = frame_->client_view()->bounds();
 406   // The shadows have a 1 pixel gap on the inside, so draw them 1 pixel inwards.
 407   gfx::Rect shadowed_area_bounds = client_area_bounds;
 408   shadowed_area_bounds.Inset(gfx::Insets(1, 1, 1, 1));
 409   int shadowed_area_top = shadowed_area_bounds.y();
 410
 411   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 412
 413   // Top: left, center, right sides.
 414   const gfx::ImageSkia* top_left = rb.GetImageSkiaNamed(IDR_APP_TOP_LEFT);
 415   const gfx::ImageSkia* top_center = rb.GetImageSkiaNamed(IDR_APP_TOP_CENTER);
 416   const gfx::ImageSkia* top_right = rb.GetImageSkiaNamed(IDR_APP_TOP_RIGHT);
 417   int top_edge_y = shadowed_area_top - top_center->height();
 418   canvas->DrawImageInt(*top_left,
 419                        shadowed_area_bounds.x() - top_left->width(),
 420                        top_edge_y);
 421   canvas->TileImageInt(*top_center,
 422                        shadowed_area_bounds.x(),
 423                        top_edge_y,
 424                        shadowed_area_bounds.width(),
 425                        top_center->height());
 426   canvas->DrawImageInt(*top_right, shadowed_area_bounds.right(), top_edge_y);
 427
 428   // Right side.
 429   const gfx::ImageSkia* right = rb.GetImageSkiaNamed(IDR_CONTENT_RIGHT_SIDE);
 430   int shadowed_area_bottom =
 431       std::max(shadowed_area_top, shadowed_area_bounds.bottom());
 432   int shadowed_area_height = shadowed_area_bottom - shadowed_area_top;
 433   canvas->TileImageInt(*right,
 434                        shadowed_area_bounds.right(),
 435                        shadowed_area_top,
 436                        right->width(),
 437                        shadowed_area_height);
 438
 439   // Bottom: left, center, right sides.
 440   const gfx::ImageSkia* bottom_left =
 441       rb.GetImageSkiaNamed(IDR_CONTENT_BOTTOM_LEFT_CORNER);
 442   const gfx::ImageSkia* bottom_center =
 443       rb.GetImageSkiaNamed(IDR_CONTENT_BOTTOM_CENTER);
 444   const gfx::ImageSkia* bottom_right =
 445       rb.GetImageSkiaNamed(IDR_CONTENT_BOTTOM_RIGHT_CORNER);
 446
 447   canvas->DrawImageInt(*bottom_left,
 448                        shadowed_area_bounds.x() - bottom_left->width(),
 449                        shadowed_area_bottom);
 450
 451   canvas->TileImageInt(*bottom_center,
 452                        shadowed_area_bounds.x(),
 453                        shadowed_area_bottom,
 454                        shadowed_area_bounds.width(),
 455                        bottom_right->height());
 456
 457   canvas->DrawImageInt(*bottom_right,
 458                        shadowed_area_bounds.right(),
 459                        shadowed_area_bottom);
 460   // Left side.
 461   const gfx::ImageSkia* left = rb.GetImageSkiaNamed(IDR_CONTENT_LEFT_SIDE);
 462   canvas->TileImageInt(*left,
 463                        shadowed_area_bounds.x() - left->width(),
 464                        shadowed_area_top,
 465                        left->width(),
 466                        shadowed_area_height);
 467 }
 468
 469 SkColor CustomFrameView::GetFrameColor() const {
 470   return frame_->IsActive() ? kDefaultColorFrame : kDefaultColorFrameInactive;
 471 }
 472
 473 const gfx::ImageSkia* CustomFrameView::GetFrameImage() const {
 474   return ui::ResourceBundle::GetSharedInstance().GetImageNamed(
 475       frame_->IsActive() ? IDR_FRAME : IDR_FRAME_INACTIVE).ToImageSkia();
 476 }
 477
 478 void CustomFrameView::LayoutWindowControls() {
 479   minimum_title_bar_x_ = 0;
 480   maximum_title_bar_x_ = width();
 481
 482   if (bounds().IsEmpty())
 483     return;
 484
 485   int caption_y = CaptionButtonY();
 486   bool is_maximized = frame_->IsMaximized();
 487   // There should always be the same number of non-shadow pixels visible to the
 488   // side of the caption buttons.  In maximized mode we extend the edge button
 489   // to the screen corner to obey Fitts' Law.
 490   int extra_width = is_maximized ?
 491       (kFrameBorderThickness - kFrameShadowThickness) : 0;
 492   int next_button_x = FrameBorderThickness();
 493
 494   bool is_restored = !is_maximized && !frame_->IsMinimized();
 495   ImageButton* invisible_button = is_restored ? restore_button_
 496                                               : maximize_button_;
 497   invisible_button->SetVisible(false);
 498
 499   WindowButtonOrderProvider* button_order =
 500       WindowButtonOrderProvider::GetInstance();
 501   const std::vector<views::FrameButton>& leading_buttons =
 502       button_order->leading_buttons();
 503   const std::vector<views::FrameButton>& trailing_buttons =
 504       button_order->trailing_buttons();
 505
 506   ImageButton* button = NULL;
 507   for (std::vector<views::FrameButton>::const_iterator it =
 508            leading_buttons.begin(); it != leading_buttons.end(); ++it) {
 509     button = GetImageButton(*it);
 510     if (!button)
 511       continue;
 512     gfx::Rect target_bounds(gfx::Point(next_button_x, caption_y),
 513                             button->GetPreferredSize());
 514     if (it == leading_buttons.begin())
 515       target_bounds.set_width(target_bounds.width() + extra_width);
 516     LayoutButton(button, target_bounds);
 517     next_button_x += button->width();
 518     minimum_title_bar_x_ = std::min(width(), next_button_x);
 519   }
 520
 521   // Trailing buttions are laid out in a RTL fashion
 522   next_button_x = width() - FrameBorderThickness();
 523   for (std::vector<views::FrameButton>::const_reverse_iterator it =
 524            trailing_buttons.rbegin(); it != trailing_buttons.rend(); ++it) {
 525     button = GetImageButton(*it);
 526     if (!button)
 527       continue;
 528     gfx::Rect target_bounds(gfx::Point(next_button_x, caption_y),
 529                             button->GetPreferredSize());
 530     if (it == trailing_buttons.rbegin())
 531       target_bounds.set_width(target_bounds.width() + extra_width);
 532     target_bounds.Offset(-target_bounds.width(), 0);
 533     LayoutButton(button, target_bounds);
 534     next_button_x = button->x();
 535     maximum_title_bar_x_ = std::max(minimum_title_bar_x_, next_button_x);
 536   }
 537 }
 538
 539 void CustomFrameView::LayoutTitleBar() {
 540   DCHECK_GE(maximum_title_bar_x_, 0);
 541   // The window title position is calculated based on the icon position, even
 542   // when there is no icon.
 543   gfx::Rect icon_bounds(IconBounds());
 544   bool show_window_icon = window_icon_ != NULL;
 545   if (show_window_icon)
 546     window_icon_->SetBoundsRect(icon_bounds);
 547
 548   if (!frame_->widget_delegate()->ShouldShowWindowTitle())
 549     return;
 550
 551   // The offset between the window left edge and the title text.
 552   int title_x = show_window_icon ? icon_bounds.right() + kTitleIconOffsetX
 553                                  : icon_bounds.x();
 554   int title_height = GetTitleFontList().GetHeight();
 555   // We bias the title position so that when the difference between the icon and
 556   // title heights is odd, the extra pixel of the title is above the vertical
 557   // midline rather than below.  This compensates for how the icon is already
 558   // biased downwards (see IconBounds()) and helps prevent descenders on the
 559   // title from overlapping the 3D edge at the bottom of the titlebar.
 560   title_bounds_.SetRect(title_x,
 561       icon_bounds.y() + ((icon_bounds.height() - title_height - 1) / 2),
 562       std::max(0, maximum_title_bar_x_ - kTitleCaptionSpacing -
 563       title_x), title_height);
 564 }
 565
 566 void CustomFrameView::LayoutClientView() {
 567   if (!ShouldShowTitleBarAndBorder()) {
 568     client_view_bounds_ = bounds();
 569     return;
 570   }
 571
 572   int top_height = NonClientTopBorderHeight();
 573   int border_thickness = NonClientBorderThickness();
 574   client_view_bounds_.SetRect(border_thickness, top_height,
 575       std::max(0, width() - (2 * border_thickness)),
 576       std::max(0, height() - top_height - border_thickness));
 577 }
 578
 579 ImageButton* CustomFrameView::InitWindowCaptionButton(
 580     int accessibility_string_id,
 581     int normal_image_id,
 582     int hot_image_id,
 583     int pushed_image_id) {
 584   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 585   ImageButton* button = new ImageButton(this);
 586   button->SetAccessibleName(l10n_util::GetStringUTF16(accessibility_string_id));
 587   button->SetImage(CustomButton::STATE_NORMAL,
 588                    rb.GetImageNamed(normal_image_id).ToImageSkia());
 589   button->SetImage(CustomButton::STATE_HOVERED,
 590                    rb.GetImageNamed(hot_image_id).ToImageSkia());
 591   button->SetImage(CustomButton::STATE_PRESSED,
 592                    rb.GetImageNamed(pushed_image_id).ToImageSkia());
 593   AddChildView(button);
 594   return button;
 595 }
 596
 597 ImageButton* CustomFrameView::GetImageButton(views::FrameButton frame_button) {
 598   ImageButton* button = NULL;
 599   switch (frame_button) {
 600     case views::FRAME_BUTTON_MINIMIZE: {
 601       button = minimize_button_;
 602       // If we should not show the minimize button, then we return NULL as we
 603       // don't want this button to become visible and to be laid out.
 604       bool should_show = frame_->widget_delegate()->CanMinimize();
 605       button->SetVisible(should_show);
 606       if (!should_show)
 607         return NULL;
 608
 609       break;
 610     }
 611     case views::FRAME_BUTTON_MAXIMIZE: {
 612       bool is_restored = !frame_->IsMaximized() && !frame_->IsMinimized();
 613       button = is_restored ? maximize_button_ : restore_button_;
 614       // If we should not show the maximize/restore button, then we return
 615       // NULL as we don't want this button to become visible and to be laid
 616       // out.
 617       bool should_show = frame_->widget_delegate()->CanMaximize();
 618       button->SetVisible(should_show);
 619       if (!should_show)
 620         return NULL;
 621
 622       break;
 623     }
 624     case views::FRAME_BUTTON_CLOSE: {
 625       button = close_button_;
 626       break;
 627     }
 628   }
 629   return button;
 630 }
 631
 632 }  // namespace views