root/chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.cc

DEFINITIONS

1. UsingNativeTheme
2. GetImageSkiaNamed
3. GetColor
4. GetDisplayProperty
5. ShouldUseNativeFrame
6. HasCustomImage
7. GetRawData
8. did_gdi_clear_
9. GetSystemMenu
10. AsDesktopWindowTreeHost
11. GetMinimizeButtonOffset
12. UsesNativeSystemMenu
13. GetInitialShowState
14. GetClientAreaInsets
15. HandleCreate
16. HandleFrameChanged
17. PreHandleMSG
18. PostHandleMSG
19. IsUsingCustomFrame
20. ShouldUseNativeFrame
21. FrameTypeChanged
22. UpdateDWMFrame
23. GetDWMFrameMargins
24. CreateBrowserDesktopWindowTreeHost

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.h"

#include <dwmapi.h>

#include "chrome/browser/lifetime/application_lifetime.h"
#include "chrome/browser/themes/theme_service.h"
#include "chrome/browser/themes/theme_service_factory.h"
#include "chrome/browser/ui/views/frame/browser_frame.h"
#include "chrome/browser/ui/views/frame/browser_frame_common_win.h"
#include "chrome/browser/ui/views/frame/browser_view.h"
#include "chrome/browser/ui/views/frame/browser_window_property_manager_win.h"
#include "chrome/browser/ui/views/frame/system_menu_insertion_delegate_win.h"
#include "chrome/browser/ui/views/tabs/tab_strip.h"
#include "chrome/browser/ui/views/theme_image_mapper.h"
#include "grit/theme_resources.h"
#include "ui/base/theme_provider.h"
#include "ui/gfx/win/dpi.h"
#include "ui/views/controls/menu/native_menu_win.h"

#pragma comment(lib, "dwmapi.lib")

namespace {

const int kClientEdgeThickness = 3;
// We need to offset the DWMFrame into the toolbar so that the blackness
// doesn't show up on our rounded corners.
const int kDWMFrameTopOffset = 3;

// DesktopThemeProvider maps resource ids using MapThemeImage(). This is
// necessary for BrowserDesktopWindowTreeHostWin so that it uses the windows
// theme images rather than the ash theme images.
class DesktopThemeProvider : public ui::ThemeProvider {
 public:
  explicit DesktopThemeProvider(ui::ThemeProvider* delegate)
      : delegate_(delegate) {
  }

  virtual bool UsingNativeTheme() const OVERRIDE {
    return delegate_->UsingNativeTheme();
  }
  virtual gfx::ImageSkia* GetImageSkiaNamed(int id) const OVERRIDE {
    return delegate_->GetImageSkiaNamed(
        chrome::MapThemeImage(chrome::HOST_DESKTOP_TYPE_NATIVE, id));
  }
  virtual SkColor GetColor(int id) const OVERRIDE {
    return delegate_->GetColor(id);
  }
  virtual int GetDisplayProperty(int id) const OVERRIDE {
    return delegate_->GetDisplayProperty(id);
  }
  virtual bool ShouldUseNativeFrame() const OVERRIDE {
    return delegate_->ShouldUseNativeFrame();
  }
  virtual bool HasCustomImage(int id) const OVERRIDE {
    return delegate_->HasCustomImage(
        chrome::MapThemeImage(chrome::HOST_DESKTOP_TYPE_NATIVE, id));

  }
  virtual base::RefCountedMemory* GetRawData(
      int id,
      ui::ScaleFactor scale_factor) const OVERRIDE {
    return delegate_->GetRawData(id, scale_factor);
  }

 private:
  ui::ThemeProvider* delegate_;

  DISALLOW_COPY_AND_ASSIGN(DesktopThemeProvider);
};

}  // namespace

////////////////////////////////////////////////////////////////////////////////
// BrowserDesktopWindowTreeHostWin, public:

BrowserDesktopWindowTreeHostWin::BrowserDesktopWindowTreeHostWin(
    views::internal::NativeWidgetDelegate* native_widget_delegate,
    views::DesktopNativeWidgetAura* desktop_native_widget_aura,
    BrowserView* browser_view,
    BrowserFrame* browser_frame)
    : DesktopWindowTreeHostWin(native_widget_delegate,
                               desktop_native_widget_aura),
      browser_view_(browser_view),
      browser_frame_(browser_frame),
      did_gdi_clear_(false) {
  scoped_ptr<ui::ThemeProvider> theme_provider(
      new DesktopThemeProvider(ThemeServiceFactory::GetForProfile(
                                   browser_view->browser()->profile())));
  browser_frame->SetThemeProvider(theme_provider.Pass());
}

BrowserDesktopWindowTreeHostWin::~BrowserDesktopWindowTreeHostWin() {
}

views::NativeMenuWin* BrowserDesktopWindowTreeHostWin::GetSystemMenu() {
  if (!system_menu_.get()) {
    SystemMenuInsertionDelegateWin insertion_delegate;
    system_menu_.reset(
        new views::NativeMenuWin(browser_frame_->GetSystemMenuModel(),
                                 GetHWND()));
    system_menu_->Rebuild(&insertion_delegate);
  }
  return system_menu_.get();
}

////////////////////////////////////////////////////////////////////////////////
// BrowserDesktopWindowTreeHostWin, BrowserDesktopWindowTreeHost implementation:

views::DesktopWindowTreeHost*
    BrowserDesktopWindowTreeHostWin::AsDesktopWindowTreeHost() {
  return this;
}

int BrowserDesktopWindowTreeHostWin::GetMinimizeButtonOffset() const {
  return minimize_button_metrics_.GetMinimizeButtonOffsetX();
}

bool BrowserDesktopWindowTreeHostWin::UsesNativeSystemMenu() const {
  return true;
}

////////////////////////////////////////////////////////////////////////////////
// BrowserDesktopWindowTreeHostWin, views::DesktopWindowTreeHostWin overrides:

int BrowserDesktopWindowTreeHostWin::GetInitialShowState() const {
  STARTUPINFO si = {0};
  si.cb = sizeof(si);
  si.dwFlags = STARTF_USESHOWWINDOW;
  GetStartupInfo(&si);
  return si.wShowWindow;
}

bool BrowserDesktopWindowTreeHostWin::GetClientAreaInsets(
    gfx::Insets* insets) const {
  // Use the default client insets for an opaque frame or a glass popup/app
  // frame.
  if (!GetWidget()->ShouldUseNativeFrame() ||
      !browser_view_->IsBrowserTypeNormal()) {
    return false;
  }

  int border_thickness = GetSystemMetrics(SM_CXSIZEFRAME);
  // In fullscreen mode, we have no frame. In restored mode, we draw our own
  // client edge over part of the default frame.
  if (GetWidget()->IsFullscreen())
    border_thickness = 0;
  else if (!IsMaximized())
    border_thickness -= kClientEdgeThickness;
  insets->Set(0, border_thickness, border_thickness, border_thickness);
  return true;
}

void BrowserDesktopWindowTreeHostWin::HandleCreate() {
  DesktopWindowTreeHostWin::HandleCreate();
  browser_window_property_manager_ =
      BrowserWindowPropertyManager::CreateBrowserWindowPropertyManager(
          browser_view_);
  if (browser_window_property_manager_)
    browser_window_property_manager_->UpdateWindowProperties(GetHWND());
}

void BrowserDesktopWindowTreeHostWin::HandleFrameChanged() {
  // Reinitialize the status bubble, since it needs to be initialized
  // differently depending on whether or not DWM composition is enabled
  browser_view_->InitStatusBubble();

  // We need to update the glass region on or off before the base class adjusts
  // the window region.
  UpdateDWMFrame();
  DesktopWindowTreeHostWin::HandleFrameChanged();
}

bool BrowserDesktopWindowTreeHostWin::PreHandleMSG(UINT message,
                                                   WPARAM w_param,
                                                   LPARAM l_param,
                                                   LRESULT* result) {
  switch (message) {
    case WM_ACTIVATE:
      if (LOWORD(w_param) != WA_INACTIVE)
        minimize_button_metrics_.OnHWNDActivated();
      return false;
    case WM_ENDSESSION:
      chrome::SessionEnding();
      return true;
    case WM_INITMENUPOPUP:
      GetSystemMenu()->UpdateStates();
      return true;
  }
  return DesktopWindowTreeHostWin::PreHandleMSG(
      message, w_param, l_param, result);
}

void BrowserDesktopWindowTreeHostWin::PostHandleMSG(UINT message,
                                                    WPARAM w_param,
                                                    LPARAM l_param) {
  switch (message) {
  case WM_CREATE:
    minimize_button_metrics_.Init(GetHWND());
    break;
  case WM_WINDOWPOSCHANGED: {
    UpdateDWMFrame();

    // Windows lies to us about the position of the minimize button before a
    // window is visible.  We use this position to place the OTR avatar in RTL
    // mode, so when the window is shown, we need to re-layout and schedule a
    // paint for the non-client frame view so that the icon top has the correct
    // position when the window becomes visible.  This fixes bugs where the icon
    // appears to overlay the minimize button.
    // Note that we will call Layout every time SetWindowPos is called with
    // SWP_SHOWWINDOW, however callers typically are careful about not
    // specifying this flag unless necessary to avoid flicker.
    // This may be invoked during creation on XP and before the non_client_view
    // has been created.
    WINDOWPOS* window_pos = reinterpret_cast<WINDOWPOS*>(l_param);
    if (window_pos->flags & SWP_SHOWWINDOW && GetWidget()->non_client_view()) {
      GetWidget()->non_client_view()->Layout();
      GetWidget()->non_client_view()->SchedulePaint();
    }
    break;
  }
  case WM_ERASEBKGND:
    if (!did_gdi_clear_ && DesktopWindowTreeHostWin::ShouldUseNativeFrame()) {
      // This is necessary to avoid white flashing in the titlebar area around
      // the minimize/maximize/close buttons.
      HDC dc = GetDC(GetHWND());
      MARGINS margins = GetDWMFrameMargins();
      RECT client_rect;
      GetClientRect(GetHWND(), &client_rect);
      HBRUSH brush = CreateSolidBrush(0);
      RECT rect = { 0, 0, client_rect.right, margins.cyTopHeight };
      FillRect(dc, &rect, brush);
      DeleteObject(brush);
      ReleaseDC(GetHWND(), dc);
      did_gdi_clear_ = true;
    }
    break;
  }
}


bool BrowserDesktopWindowTreeHostWin::IsUsingCustomFrame() const {
  // We don't theme popup or app windows, so regardless of whether or not a
  // theme is active for normal browser windows, we don't want to use the custom
  // frame for popups/apps.
  if (!browser_view_->IsBrowserTypeNormal() &&
      !DesktopWindowTreeHostWin::IsUsingCustomFrame()) {
    return false;
  }

  // Otherwise, we use the native frame when we're told we should by the theme
  // provider (e.g. no custom theme is active).
  return !GetWidget()->GetThemeProvider()->ShouldUseNativeFrame();
}

bool BrowserDesktopWindowTreeHostWin::ShouldUseNativeFrame() const {
  if (!views::DesktopWindowTreeHostWin::ShouldUseNativeFrame())
    return false;
  // This function can get called when the Browser window is closed i.e. in the
  // context of the BrowserView destructor.
  if (!browser_view_->browser())
    return false;
  return chrome::ShouldUseNativeFrame(browser_view_,
                                      GetWidget()->GetThemeProvider());
}

void BrowserDesktopWindowTreeHostWin::FrameTypeChanged() {
  views::DesktopWindowTreeHostWin::FrameTypeChanged();
  did_gdi_clear_ = false;
}

////////////////////////////////////////////////////////////////////////////////
// BrowserDesktopWindowTreeHostWin, private:

void BrowserDesktopWindowTreeHostWin::UpdateDWMFrame() {
  // For "normal" windows on Aero, we always need to reset the glass area
  // correctly, even if we're not currently showing the native frame (e.g.
  // because a theme is showing), so we explicitly check for that case rather
  // than checking browser_frame_->ShouldUseNativeFrame() here.  Using that here
  // would mean we wouldn't reset the glass area to zero when moving from the
  // native frame to an opaque frame, leading to graphical glitches behind the
  // opaque frame.  Instead, we use that function below to tell us whether the
  // frame is currently native or opaque.
  if (!GetWidget()->client_view() || !browser_view_->IsBrowserTypeNormal() ||
      !DesktopWindowTreeHostWin::ShouldUseNativeFrame())
    return;

  MARGINS margins = GetDWMFrameMargins();

  DwmExtendFrameIntoClientArea(GetHWND(), &margins);
}

MARGINS BrowserDesktopWindowTreeHostWin::GetDWMFrameMargins() const {
  MARGINS margins = { 0 };

  // If the opaque frame is visible, we use the default (zero) margins.
  // Otherwise, we need to figure out how to extend the glass in.
  if (GetWidget()->ShouldUseNativeFrame()) {
    // In fullscreen mode, we don't extend glass into the client area at all,
    // because the GDI-drawn text in the web content composited over it will
    // become semi-transparent over any glass area.
    if (!IsMaximized() && !GetWidget()->IsFullscreen()) {
      margins.cxLeftWidth = kClientEdgeThickness + 1;
      margins.cxRightWidth = kClientEdgeThickness + 1;
      margins.cyBottomHeight = kClientEdgeThickness + 1;
      margins.cyTopHeight = kClientEdgeThickness + 1;
    }
    // In maximized mode, we only have a titlebar strip of glass, no side/bottom
    // borders.
    if (!browser_view_->IsFullscreen()) {
      gfx::Rect tabstrip_bounds(
          browser_frame_->GetBoundsForTabStrip(browser_view_->tabstrip()));
      tabstrip_bounds = gfx::win::DIPToScreenRect(tabstrip_bounds);
      margins.cyTopHeight = tabstrip_bounds.bottom() + kDWMFrameTopOffset;
    }
  }
  return margins;
}

////////////////////////////////////////////////////////////////////////////////
// BrowserDesktopWindowTreeHost, public:

// static
BrowserDesktopWindowTreeHost*
    BrowserDesktopWindowTreeHost::CreateBrowserDesktopWindowTreeHost(
        views::internal::NativeWidgetDelegate* native_widget_delegate,
        views::DesktopNativeWidgetAura* desktop_native_widget_aura,
        BrowserView* browser_view,
        BrowserFrame* browser_frame) {
  return new BrowserDesktopWindowTreeHostWin(native_widget_delegate,
                                             desktop_native_widget_aura,
                                             browser_view,
                                             browser_frame);
}