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/resources/grit/views_resources.h"
  24 #include "ui/views/views_delegate.h"
  25 #include "ui/views/widget/native_widget_private.h"
  26 #include "ui/views/widget/widget.h"
  27 #include "ui/views/widget/widget_delegate.h"
  28 #include "ui/views/window/client_view.h"
  29 #include "ui/views/window/frame_background.h"
  30 #include "ui/views/window/window_button_order_provider.h"
  31 #include "ui/views/window/window_resources.h"
  32 #include "ui/views/window/window_shape.h"
  33
  34 namespace views {
  35
  36 namespace {
  37
  38 // The frame border is only visible in restored mode and is hardcoded to 4 px on
  39 // each side regardless of the system window border size.
  40 const int kFrameBorderThickness = 4;
  41 // In the window corners, the resize areas don't actually expand bigger, but the
  42 // 16 px at the end of each edge triggers diagonal resizing.
  43 const int kResizeAreaCornerSize = 16;
  44 // The titlebar never shrinks too short to show the caption button plus some
  45 // padding below it.
  46 const int kCaptionButtonHeightWithPadding = 19;
  47 // The titlebar has a 2 px 3D edge along the top and bottom.
  48 const int kTitlebarTopAndBottomEdgeThickness = 2;
  49 // The icon is inset 2 px from the left frame border.
  50 const int kIconLeftSpacing = 2;
  51 // The space between the window icon and the title text.
  52 const int kTitleIconOffsetX = 4;
  53 // The space between the title text and the caption buttons.
  54 const int kTitleCaptionSpacing = 5;
  55
  56 #if !defined(OS_WIN)
  57 // The icon never shrinks below 16 px on a side.
  58 const int kIconMinimumSize = 16;
  59 #endif
  60
  61 #if defined(OS_CHROMEOS)
  62 // Chrome OS uses a dark gray.
  63 const SkColor kDefaultColorFrame = SkColorSetRGB(109, 109, 109);
  64 const SkColor kDefaultColorFrameInactive = SkColorSetRGB(176, 176, 176);
  65 #else
  66 // Windows and Linux use a blue.
  67 const SkColor kDefaultColorFrame = SkColorSetRGB(66, 116, 201);
  68 const SkColor kDefaultColorFrameInactive = SkColorSetRGB(161, 182, 228);
  69 #endif
  70
  71 const gfx::FontList& GetTitleFontList() {
  72   static const gfx::FontList title_font_list =
  73       internal::NativeWidgetPrivate::GetWindowTitleFontList();
  74   return title_font_list;
  75 }
  76
  77 void LayoutButton(ImageButton* button, const gfx::Rect& bounds) {
  78   button->SetVisible(true);
  79   button->SetImageAlignment(ImageButton::ALIGN_LEFT,
  80                             ImageButton::ALIGN_BOTTOM);
  81   button->SetBoundsRect(bounds);
  82 }
  83
  84 }  // namespace
  85
  86 ///////////////////////////////////////////////////////////////////////////////
  87 // CustomFrameView, public:
  88
  89 CustomFrameView::CustomFrameView()
  90     : frame_(NULL),
  91       window_icon_(NULL),
  92       minimize_button_(NULL),
  93       maximize_button_(NULL),
  94       restore_button_(NULL),
  95       close_button_(NULL),
  96       frame_background_(new FrameBackground()),
  97       minimum_title_bar_x_(0),
  98       maximum_title_bar_x_(-1) {
  99 }
 100
 101 CustomFrameView::~CustomFrameView() {
 102 }
 103
 104 void CustomFrameView::Init(Widget* frame) {
 105   frame_ = frame;
 106
 107   close_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_CLOSE,
 108       IDR_CLOSE, IDR_CLOSE_H, IDR_CLOSE_P);
 109   minimize_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_MINIMIZE,
 110       IDR_MINIMIZE, IDR_MINIMIZE_H, IDR_MINIMIZE_P);
 111   maximize_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_MAXIMIZE,
 112       IDR_MAXIMIZE, IDR_MAXIMIZE_H, IDR_MAXIMIZE_P);
 113   restore_button_ = InitWindowCaptionButton(IDS_APP_ACCNAME_RESTORE,
 114       IDR_RESTORE, IDR_RESTORE_H, IDR_RESTORE_P);
 115
 116   if (frame_->widget_delegate()->ShouldShowWindowIcon()) {
 117     window_icon_ = new ImageButton(this);
 118     AddChildView(window_icon_);
 119   }
 120 }
 121
 122 ///////////////////////////////////////////////////////////////////////////////
 123 // CustomFrameView, NonClientFrameView implementation:
 124
 125 gfx::Rect CustomFrameView::GetBoundsForClientView() const {
 126   return client_view_bounds_;
 127 }
 128
 129 gfx::Rect CustomFrameView::GetWindowBoundsForClientBounds(
 130     const gfx::Rect& client_bounds) const {
 131   int top_height = NonClientTopBorderHeight();
 132   int border_thickness = NonClientBorderThickness();
 133   return gfx::Rect(client_bounds.x() - border_thickness,
 134                    client_bounds.y() - top_height,
 135                    client_bounds.width() + (2 * border_thickness),
 136                    client_bounds.height() + top_height + border_thickness);
 137 }
 138
 139 int CustomFrameView::NonClientHitTest(const gfx::Point& point) {
 140   // Sanity check.
 141   if (!bounds().Contains(point))
 142     return HTNOWHERE;
 143
 144   int frame_component = frame_->client_view()->NonClientHitTest(point);
 145
 146   // See if we're in the sysmenu region.  (We check the ClientView first to be
 147   // consistent with OpaqueBrowserFrameView; it's not really necessary here.)
 148   gfx::Rect sysmenu_rect(IconBounds());
 149   // In maximized mode we extend the rect to the screen corner to take advantage
 150   // of Fitts' Law.
 151   if (frame_->IsMaximized())
 152     sysmenu_rect.SetRect(0, 0, sysmenu_rect.right(), sysmenu_rect.bottom());
 153   sysmenu_rect.set_x(GetMirroredXForRect(sysmenu_rect));
 154   if (sysmenu_rect.Contains(point))
 155     return (frame_component == HTCLIENT) ? HTCLIENT : HTSYSMENU;
 156
 157   if (frame_component != HTNOWHERE)
 158     return frame_component;
 159
 160   // Then see if the point is within any of the window controls.
 161   if (close_button_->GetMirroredBounds().Contains(point))
 162     return HTCLOSE;
 163   if (restore_button_->GetMirroredBounds().Contains(point))
 164     return HTMAXBUTTON;
 165   if (maximize_button_->GetMirroredBounds().Contains(point))
 166     return HTMAXBUTTON;
 167   if (minimize_button_->GetMirroredBounds().Contains(point))
 168     return HTMINBUTTON;
 169   if (window_icon_ && window_icon_->GetMirroredBounds().Contains(point))
 170     return HTSYSMENU;
 171
 172   int window_component = GetHTComponentForFrame(point, FrameBorderThickness(),
 173       NonClientBorderThickness(), kResizeAreaCornerSize, kResizeAreaCornerSize,
 174       frame_->widget_delegate()->CanResize());
 175   // Fall back to the caption if no other component matches.
 176   return (window_component == HTNOWHERE) ? HTCAPTION : window_component;
 177 }
 178
 179 void CustomFrameView::GetWindowMask(const gfx::Size& size,
 180                                     gfx::Path* window_mask) {
 181   DCHECK(window_mask);
 182   if (frame_->IsMaximized() || !ShouldShowTitleBarAndBorder())
 183     return;
 184
 185   GetDefaultWindowMask(size, window_mask);
 186 }
 187
 188 void CustomFrameView::ResetWindowControls() {
 189   restore_button_->SetState(CustomButton::STATE_NORMAL);
 190   minimize_button_->SetState(CustomButton::STATE_NORMAL);
 191   maximize_button_->SetState(CustomButton::STATE_NORMAL);
 192   // The close button isn't affected by this constraint.
 193 }
 194
 195 void CustomFrameView::UpdateWindowIcon() {
 196   if (window_icon_)
 197     window_icon_->SchedulePaint();
 198 }
 199
 200 void CustomFrameView::UpdateWindowTitle() {
 201   if (frame_->widget_delegate()->ShouldShowWindowTitle())
 202     SchedulePaintInRect(title_bounds_);
 203 }
 204
 205 void CustomFrameView::SizeConstraintsChanged() {
 206   ResetWindowControls();
 207   LayoutWindowControls();
 208 }
 209
 210 ///////////////////////////////////////////////////////////////////////////////
 211 // CustomFrameView, View overrides:
 212
 213 void CustomFrameView::OnPaint(gfx::Canvas* canvas) {
 214   if (!ShouldShowTitleBarAndBorder())
 215     return;
 216
 217   if (frame_->IsMaximized())
 218     PaintMaximizedFrameBorder(canvas);
 219   else
 220     PaintRestoredFrameBorder(canvas);
 221   PaintTitleBar(canvas);
 222   if (ShouldShowClientEdge())
 223     PaintRestoredClientEdge(canvas);
 224 }
 225
 226 void CustomFrameView::Layout() {
 227   if (ShouldShowTitleBarAndBorder()) {
 228     LayoutWindowControls();
 229     LayoutTitleBar();
 230   }
 231
 232   LayoutClientView();
 233 }
 234
 235 gfx::Size CustomFrameView::GetPreferredSize() const {
 236   return frame_->non_client_view()->GetWindowBoundsForClientBounds(
 237       gfx::Rect(frame_->client_view()->GetPreferredSize())).size();
 238 }
 239
 240 gfx::Size CustomFrameView::GetMinimumSize() const {
 241   return frame_->non_client_view()->GetWindowBoundsForClientBounds(
 242       gfx::Rect(frame_->client_view()->GetMinimumSize())).size();
 243 }
 244
 245 gfx::Size CustomFrameView::GetMaximumSize() const {
 246   gfx::Size max_size = frame_->client_view()->GetMaximumSize();
 247   gfx::Size converted_size =
 248       frame_->non_client_view()->GetWindowBoundsForClientBounds(
 249           gfx::Rect(max_size)).size();
 250   return gfx::Size(max_size.width() == 0 ? 0 : converted_size.width(),
 251                    max_size.height() == 0 ? 0 : converted_size.height());
 252 }
 253
 254 ///////////////////////////////////////////////////////////////////////////////
 255 // CustomFrameView, ButtonListener implementation:
 256
 257 void CustomFrameView::ButtonPressed(Button* sender, const ui::Event& event) {
 258   if (sender == close_button_)
 259     frame_->Close();
 260   else if (sender == minimize_button_)
 261     frame_->Minimize();
 262   else if (sender == maximize_button_)
 263     frame_->Maximize();
 264   else if (sender == restore_button_)
 265     frame_->Restore();
 266 }
 267
 268 ///////////////////////////////////////////////////////////////////////////////
 269 // CustomFrameView, private:
 270
 271 int CustomFrameView::FrameBorderThickness() const {
 272   return frame_->IsMaximized() ? 0 : kFrameBorderThickness;
 273 }
 274
 275 int CustomFrameView::NonClientBorderThickness() const {
 276   // In maximized mode, we don't show a client edge.
 277   return FrameBorderThickness() +
 278       (ShouldShowClientEdge() ? kClientEdgeThickness : 0);
 279 }
 280
 281 int CustomFrameView::NonClientTopBorderHeight() const {
 282   return std::max(FrameBorderThickness() + IconSize(),
 283                   CaptionButtonY() + kCaptionButtonHeightWithPadding) +
 284       TitlebarBottomThickness();
 285 }
 286
 287 int CustomFrameView::CaptionButtonY() const {
 288   // Maximized buttons start at window top so that even if their images aren't
 289   // drawn flush with the screen edge, they still obey Fitts' Law.
 290 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 291   return FrameBorderThickness();
 292 #else
 293   return frame_->IsMaximized() ? FrameBorderThickness() : kFrameShadowThickness;
 294 #endif
 295 }
 296
 297 int CustomFrameView::TitlebarBottomThickness() const {
 298   return kTitlebarTopAndBottomEdgeThickness +
 299       (ShouldShowClientEdge() ? kClientEdgeThickness : 0);
 300 }
 301
 302 int CustomFrameView::IconSize() const {
 303 #if defined(OS_WIN)
 304   // This metric scales up if either the titlebar height or the titlebar font
 305   // size are increased.
 306   return GetSystemMetrics(SM_CYSMICON);
 307 #else
 308   return std::max(GetTitleFontList().GetHeight(), kIconMinimumSize);
 309 #endif
 310 }
 311
 312 gfx::Rect CustomFrameView::IconBounds() const {
 313   int size = IconSize();
 314   int frame_thickness = FrameBorderThickness();
 315   // Our frame border has a different "3D look" than Windows'.  Theirs has a
 316   // more complex gradient on the top that they push their icon/title below;
 317   // then the maximized window cuts this off and the icon/title are centered
 318   // in the remaining space.  Because the apparent shape of our border is
 319   // simpler, using the same positioning makes things look slightly uncentered
 320   // with restored windows, so when the window is restored, instead of
 321   // calculating the remaining space from below the frame border, we calculate
 322   // from below the 3D edge.
 323   int unavailable_px_at_top = frame_->IsMaximized() ?
 324       frame_thickness : kTitlebarTopAndBottomEdgeThickness;
 325   // When the icon is shorter than the minimum space we reserve for the caption
 326   // button, we vertically center it.  We want to bias rounding to put extra
 327   // space above the icon, since the 3D edge (+ client edge, for restored
 328   // windows) below looks (to the eye) more like additional space than does the
 329   // 3D edge (or nothing at all, for maximized windows) above; hence the +1.
 330   int y = unavailable_px_at_top + (NonClientTopBorderHeight() -
 331       unavailable_px_at_top - size - TitlebarBottomThickness() + 1) / 2;
 332   return gfx::Rect(frame_thickness + kIconLeftSpacing + minimum_title_bar_x_,
 333                    y, size, size);
 334 }
 335
 336 bool CustomFrameView::ShouldShowTitleBarAndBorder() const {
 337   if (frame_->IsFullscreen())
 338     return false;
 339
 340   if (ViewsDelegate::GetInstance()) {
 341     return !ViewsDelegate::GetInstance()->WindowManagerProvidesTitleBar(
 342         frame_->IsMaximized());
 343   }
 344
 345   return true;
 346 }
 347
 348 bool CustomFrameView::ShouldShowClientEdge() const {
 349   return !frame_->IsMaximized() && ShouldShowTitleBarAndBorder();
 350 }
 351
 352 void CustomFrameView::PaintRestoredFrameBorder(gfx::Canvas* canvas) {
 353   frame_background_->set_frame_color(GetFrameColor());
 354   const gfx::ImageSkia* frame_image = GetFrameImage();
 355   frame_background_->set_theme_image(frame_image);
 356   frame_background_->set_top_area_height(frame_image->height());
 357
 358   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 359
 360   frame_background_->SetCornerImages(
 361       rb.GetImageNamed(IDR_WINDOW_TOP_LEFT_CORNER).ToImageSkia(),
 362       rb.GetImageNamed(IDR_WINDOW_TOP_RIGHT_CORNER).ToImageSkia(),
 363       rb.GetImageNamed(IDR_WINDOW_BOTTOM_LEFT_CORNER).ToImageSkia(),
 364       rb.GetImageNamed(IDR_WINDOW_BOTTOM_RIGHT_CORNER).ToImageSkia());
 365   frame_background_->SetSideImages(
 366       rb.GetImageNamed(IDR_WINDOW_LEFT_SIDE).ToImageSkia(),
 367       rb.GetImageNamed(IDR_WINDOW_TOP_CENTER).ToImageSkia(),
 368       rb.GetImageNamed(IDR_WINDOW_RIGHT_SIDE).ToImageSkia(),
 369       rb.GetImageNamed(IDR_WINDOW_BOTTOM_CENTER).ToImageSkia());
 370
 371   frame_background_->PaintRestored(canvas, this);
 372 }
 373
 374 void CustomFrameView::PaintMaximizedFrameBorder(gfx::Canvas* canvas) {
 375   const gfx::ImageSkia* frame_image = GetFrameImage();
 376   frame_background_->set_theme_image(frame_image);
 377   frame_background_->set_top_area_height(frame_image->height());
 378   frame_background_->PaintMaximized(canvas, this);
 379
 380   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 381
 382   // TODO(jamescook): Migrate this into FrameBackground.
 383   // The bottom of the titlebar actually comes from the top of the Client Edge
 384   // graphic, with the actual client edge clipped off the bottom.
 385   const gfx::ImageSkia* titlebar_bottom = rb.GetImageNamed(
 386       IDR_APP_TOP_CENTER).ToImageSkia();
 387   int edge_height = titlebar_bottom->height() -
 388       (ShouldShowClientEdge() ? kClientEdgeThickness : 0);
 389   canvas->TileImageInt(*titlebar_bottom, 0,
 390       frame_->client_view()->y() - edge_height, width(), edge_height);
 391 }
 392
 393 void CustomFrameView::PaintTitleBar(gfx::Canvas* canvas) {
 394   WidgetDelegate* delegate = frame_->widget_delegate();
 395
 396   // It seems like in some conditions we can be asked to paint after the window
 397   // that contains us is WM_DESTROYed. At this point, our delegate is NULL. The
 398   // correct long term fix may be to shut down the RootView in WM_DESTROY.
 399   if (!delegate || !delegate->ShouldShowWindowTitle())
 400     return;
 401
 402   gfx::Rect rect = title_bounds_;
 403   rect.set_x(GetMirroredXForRect(title_bounds_));
 404   canvas->DrawStringRect(delegate->GetWindowTitle(), GetTitleFontList(),
 405                          SK_ColorWHITE, rect);
 406 }
 407
 408 void CustomFrameView::PaintRestoredClientEdge(gfx::Canvas* canvas) {
 409   gfx::Rect client_area_bounds = frame_->client_view()->bounds();
 410   // The shadows have a 1 pixel gap on the inside, so draw them 1 pixel inwards.
 411   gfx::Rect shadowed_area_bounds = client_area_bounds;
 412   shadowed_area_bounds.Inset(gfx::Insets(1, 1, 1, 1));
 413   int shadowed_area_top = shadowed_area_bounds.y();
 414
 415   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 416
 417   // Top: left, center, right sides.
 418   const gfx::ImageSkia* top_left = rb.GetImageSkiaNamed(IDR_APP_TOP_LEFT);
 419   const gfx::ImageSkia* top_center = rb.GetImageSkiaNamed(IDR_APP_TOP_CENTER);
 420   const gfx::ImageSkia* top_right = rb.GetImageSkiaNamed(IDR_APP_TOP_RIGHT);
 421   int top_edge_y = shadowed_area_top - top_center->height();
 422   canvas->DrawImageInt(*top_left,
 423                        shadowed_area_bounds.x() - top_left->width(),
 424                        top_edge_y);
 425   canvas->TileImageInt(*top_center,
 426                        shadowed_area_bounds.x(),
 427                        top_edge_y,
 428                        shadowed_area_bounds.width(),
 429                        top_center->height());
 430   canvas->DrawImageInt(*top_right, shadowed_area_bounds.right(), top_edge_y);
 431
 432   // Right side.
 433   const gfx::ImageSkia* right = rb.GetImageSkiaNamed(IDR_CONTENT_RIGHT_SIDE);
 434   int shadowed_area_bottom =
 435       std::max(shadowed_area_top, shadowed_area_bounds.bottom());
 436   int shadowed_area_height = shadowed_area_bottom - shadowed_area_top;
 437   canvas->TileImageInt(*right,
 438                        shadowed_area_bounds.right(),
 439                        shadowed_area_top,
 440                        right->width(),
 441                        shadowed_area_height);
 442
 443   // Bottom: left, center, right sides.
 444   const gfx::ImageSkia* bottom_left =
 445       rb.GetImageSkiaNamed(IDR_CONTENT_BOTTOM_LEFT_CORNER);
 446   const gfx::ImageSkia* bottom_center =
 447       rb.GetImageSkiaNamed(IDR_CONTENT_BOTTOM_CENTER);
 448   const gfx::ImageSkia* bottom_right =
 449       rb.GetImageSkiaNamed(IDR_CONTENT_BOTTOM_RIGHT_CORNER);
 450
 451   canvas->DrawImageInt(*bottom_left,
 452                        shadowed_area_bounds.x() - bottom_left->width(),
 453                        shadowed_area_bottom);
 454
 455   canvas->TileImageInt(*bottom_center,
 456                        shadowed_area_bounds.x(),
 457                        shadowed_area_bottom,
 458                        shadowed_area_bounds.width(),
 459                        bottom_right->height());
 460
 461   canvas->DrawImageInt(*bottom_right,
 462                        shadowed_area_bounds.right(),
 463                        shadowed_area_bottom);
 464   // Left side.
 465   const gfx::ImageSkia* left = rb.GetImageSkiaNamed(IDR_CONTENT_LEFT_SIDE);
 466   canvas->TileImageInt(*left,
 467                        shadowed_area_bounds.x() - left->width(),
 468                        shadowed_area_top,
 469                        left->width(),
 470                        shadowed_area_height);
 471 }
 472
 473 SkColor CustomFrameView::GetFrameColor() const {
 474   return frame_->IsActive() ? kDefaultColorFrame : kDefaultColorFrameInactive;
 475 }
 476
 477 const gfx::ImageSkia* CustomFrameView::GetFrameImage() const {
 478   return ui::ResourceBundle::GetSharedInstance().GetImageNamed(
 479       frame_->IsActive() ? IDR_FRAME : IDR_FRAME_INACTIVE).ToImageSkia();
 480 }
 481
 482 void CustomFrameView::LayoutWindowControls() {
 483   minimum_title_bar_x_ = 0;
 484   maximum_title_bar_x_ = width();
 485
 486   if (bounds().IsEmpty())
 487     return;
 488
 489   int caption_y = CaptionButtonY();
 490   bool is_maximized = frame_->IsMaximized();
 491   // There should always be the same number of non-shadow pixels visible to the
 492   // side of the caption buttons.  In maximized mode we extend the edge button
 493   // to the screen corner to obey Fitts' Law.
 494   int extra_width = is_maximized ?
 495       (kFrameBorderThickness - kFrameShadowThickness) : 0;
 496   int next_button_x = FrameBorderThickness();
 497
 498   bool is_restored = !is_maximized && !frame_->IsMinimized();
 499   ImageButton* invisible_button = is_restored ? restore_button_
 500                                               : maximize_button_;
 501   invisible_button->SetVisible(false);
 502
 503   WindowButtonOrderProvider* button_order =
 504       WindowButtonOrderProvider::GetInstance();
 505   const std::vector<views::FrameButton>& leading_buttons =
 506       button_order->leading_buttons();
 507   const std::vector<views::FrameButton>& trailing_buttons =
 508       button_order->trailing_buttons();
 509
 510   ImageButton* button = NULL;
 511   for (std::vector<views::FrameButton>::const_iterator it =
 512            leading_buttons.begin(); it != leading_buttons.end(); ++it) {
 513     button = GetImageButton(*it);
 514     if (!button)
 515       continue;
 516     gfx::Rect target_bounds(gfx::Point(next_button_x, caption_y),
 517                             button->GetPreferredSize());
 518     if (it == leading_buttons.begin())
 519       target_bounds.set_width(target_bounds.width() + extra_width);
 520     LayoutButton(button, target_bounds);
 521     next_button_x += button->width();
 522     minimum_title_bar_x_ = std::min(width(), next_button_x);
 523   }
 524
 525   // Trailing buttions are laid out in a RTL fashion
 526   next_button_x = width() - FrameBorderThickness();
 527   for (std::vector<views::FrameButton>::const_reverse_iterator it =
 528            trailing_buttons.rbegin(); it != trailing_buttons.rend(); ++it) {
 529     button = GetImageButton(*it);
 530     if (!button)
 531       continue;
 532     gfx::Rect target_bounds(gfx::Point(next_button_x, caption_y),
 533                             button->GetPreferredSize());
 534     if (it == trailing_buttons.rbegin())
 535       target_bounds.set_width(target_bounds.width() + extra_width);
 536     target_bounds.Offset(-target_bounds.width(), 0);
 537     LayoutButton(button, target_bounds);
 538     next_button_x = button->x();
 539     maximum_title_bar_x_ = std::max(minimum_title_bar_x_, next_button_x);
 540   }
 541 }
 542
 543 void CustomFrameView::LayoutTitleBar() {
 544   DCHECK_GE(maximum_title_bar_x_, 0);
 545   // The window title position is calculated based on the icon position, even
 546   // when there is no icon.
 547   gfx::Rect icon_bounds(IconBounds());
 548   bool show_window_icon = window_icon_ != NULL;
 549   if (show_window_icon)
 550     window_icon_->SetBoundsRect(icon_bounds);
 551
 552   if (!frame_->widget_delegate()->ShouldShowWindowTitle())
 553     return;
 554
 555   // The offset between the window left edge and the title text.
 556   int title_x = show_window_icon ? icon_bounds.right() + kTitleIconOffsetX
 557                                  : icon_bounds.x();
 558   int title_height = GetTitleFontList().GetHeight();
 559   // We bias the title position so that when the difference between the icon and
 560   // title heights is odd, the extra pixel of the title is above the vertical
 561   // midline rather than below.  This compensates for how the icon is already
 562   // biased downwards (see IconBounds()) and helps prevent descenders on the
 563   // title from overlapping the 3D edge at the bottom of the titlebar.
 564   title_bounds_.SetRect(title_x,
 565       icon_bounds.y() + ((icon_bounds.height() - title_height - 1) / 2),
 566       std::max(0, maximum_title_bar_x_ - kTitleCaptionSpacing -
 567       title_x), title_height);
 568 }
 569
 570 void CustomFrameView::LayoutClientView() {
 571   if (!ShouldShowTitleBarAndBorder()) {
 572     client_view_bounds_ = bounds();
 573     return;
 574   }
 575
 576   int top_height = NonClientTopBorderHeight();
 577   int border_thickness = NonClientBorderThickness();
 578   client_view_bounds_.SetRect(border_thickness, top_height,
 579       std::max(0, width() - (2 * border_thickness)),
 580       std::max(0, height() - top_height - border_thickness));
 581 }
 582
 583 ImageButton* CustomFrameView::InitWindowCaptionButton(
 584     int accessibility_string_id,
 585     int normal_image_id,
 586     int hot_image_id,
 587     int pushed_image_id) {
 588   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 589   ImageButton* button = new ImageButton(this);
 590   button->SetAccessibleName(l10n_util::GetStringUTF16(accessibility_string_id));
 591   button->SetImage(CustomButton::STATE_NORMAL,
 592                    rb.GetImageNamed(normal_image_id).ToImageSkia());
 593   button->SetImage(CustomButton::STATE_HOVERED,
 594                    rb.GetImageNamed(hot_image_id).ToImageSkia());
 595   button->SetImage(CustomButton::STATE_PRESSED,
 596                    rb.GetImageNamed(pushed_image_id).ToImageSkia());
 597   AddChildView(button);
 598   return button;
 599 }
 600
 601 ImageButton* CustomFrameView::GetImageButton(views::FrameButton frame_button) {
 602   ImageButton* button = NULL;
 603   switch (frame_button) {
 604     case views::FRAME_BUTTON_MINIMIZE: {
 605       button = minimize_button_;
 606       // If we should not show the minimize button, then we return NULL as we
 607       // don't want this button to become visible and to be laid out.
 608       bool should_show = frame_->widget_delegate()->CanMinimize();
 609       button->SetVisible(should_show);
 610       if (!should_show)
 611         return NULL;
 612
 613       break;
 614     }
 615     case views::FRAME_BUTTON_MAXIMIZE: {
 616       bool is_restored = !frame_->IsMaximized() && !frame_->IsMinimized();
 617       button = is_restored ? maximize_button_ : restore_button_;
 618       // If we should not show the maximize/restore button, then we return
 619       // NULL as we don't want this button to become visible and to be laid
 620       // out.
 621       bool should_show = frame_->widget_delegate()->CanMaximize();
 622       button->SetVisible(should_show);
 623       if (!should_show)
 624         return NULL;
 625
 626       break;
 627     }
 628     case views::FRAME_BUTTON_CLOSE: {
 629       button = close_button_;
 630       break;
 631     }
 632   }
 633   return button;
 634 }
 635
 636 }  // namespace views