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      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/image/image.h"
     17 #include "ui/gfx/path.h"
     18 #include "ui/gfx/rect.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
    633