chrome/browser/ui/window_sizer/window_sizer.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 "chrome/browser/ui/window_sizer/window_sizer.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/compiler_specific.h"
   9 #include "base/prefs/pref_service.h"
  10 #include "chrome/browser/browser_process.h"
  11 #include "chrome/browser/profiles/profile.h"
  12 #include "chrome/browser/ui/browser.h"
  13 #include "chrome/browser/ui/browser_list.h"
  14 #include "chrome/browser/ui/browser_window.h"
  15 #include "chrome/browser/ui/browser_window_state.h"
  16 #include "chrome/browser/ui/host_desktop.h"
  17 #include "chrome/common/chrome_switches.h"
  18 #include "chrome/common/pref_names.h"
  19 #include "ui/gfx/screen.h"
  20
  21 #if defined(USE_ASH)
  22 #include "ash/shell.h"
  23 #include "ash/wm/window_positioner.h"
  24 #include "chrome/browser/ui/ash/ash_init.h"
  25 #endif
  26
  27 namespace {
  28
  29 // Minimum height of the visible part of a window.
  30 const int kMinVisibleHeight = 30;
  31 // Minimum width of the visible part of a window.
  32 const int kMinVisibleWidth = 30;
  33
  34 ///////////////////////////////////////////////////////////////////////////////
  35 // An implementation of WindowSizer::StateProvider that gets the last active
  36 // and persistent state from the browser window and the user's profile.
  37 class DefaultStateProvider : public WindowSizer::StateProvider {
  38  public:
  39   DefaultStateProvider(const std::string& app_name, const Browser* browser)
  40       : app_name_(app_name), browser_(browser) {
  41   }
  42
  43   // Overridden from WindowSizer::StateProvider:
  44   virtual bool GetPersistentState(
  45       gfx::Rect* bounds,
  46       gfx::Rect* work_area,
  47       ui::WindowShowState* show_state) const OVERRIDE {
  48     DCHECK(bounds);
  49     DCHECK(show_state);
  50
  51     if (!browser_ || !browser_->profile()->GetPrefs())
  52       return false;
  53
  54     std::string window_name(chrome::GetWindowPlacementKey(browser_));
  55     const base::DictionaryValue* wp_pref =
  56         browser_->profile()->GetPrefs()->GetDictionary(window_name.c_str());
  57     int top = 0, left = 0, bottom = 0, right = 0;
  58     bool maximized = false;
  59     bool has_prefs = wp_pref &&
  60                      wp_pref->GetInteger("top", &top) &&
  61                      wp_pref->GetInteger("left", &left) &&
  62                      wp_pref->GetInteger("bottom", &bottom) &&
  63                      wp_pref->GetInteger("right", &right) &&
  64                      wp_pref->GetBoolean("maximized", &maximized);
  65     bounds->SetRect(left, top, std::max(0, right - left),
  66                     std::max(0, bottom - top));
  67
  68     int work_area_top = 0;
  69     int work_area_left = 0;
  70     int work_area_bottom = 0;
  71     int work_area_right = 0;
  72     if (wp_pref) {
  73       wp_pref->GetInteger("work_area_top", &work_area_top);
  74       wp_pref->GetInteger("work_area_left", &work_area_left);
  75       wp_pref->GetInteger("work_area_bottom", &work_area_bottom);
  76       wp_pref->GetInteger("work_area_right", &work_area_right);
  77       if (*show_state == ui::SHOW_STATE_DEFAULT && maximized)
  78         *show_state = ui::SHOW_STATE_MAXIMIZED;
  79     }
  80     work_area->SetRect(work_area_left, work_area_top,
  81                       std::max(0, work_area_right - work_area_left),
  82                       std::max(0, work_area_bottom - work_area_top));
  83
  84     return has_prefs;
  85   }
  86
  87   virtual bool GetLastActiveWindowState(
  88       gfx::Rect* bounds,
  89       ui::WindowShowState* show_state) const OVERRIDE {
  90     DCHECK(show_state);
  91     // Applications are always restored with the same position.
  92     if (!app_name_.empty())
  93       return false;
  94
  95     // If a reference browser is set, use its window. Otherwise find last
  96     // active. Panels are never used as reference browsers as panels are
  97     // specially positioned.
  98     BrowserWindow* window = NULL;
  99     // Window may be null if browser is just starting up.
 100     if (browser_ && browser_->window()) {
 101       window = browser_->window();
 102     } else {
 103       // This code is only ran on the native desktop (on the ash
 104       // desktop, GetTabbedBrowserBoundsAsh should take over below
 105       // before this is reached).  TODO(gab): This code should go in a
 106       // native desktop specific window sizer as part of fixing
 107       // crbug.com/175812.
 108       const BrowserList* native_browser_list =
 109           BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE);
 110       for (BrowserList::const_reverse_iterator it =
 111                native_browser_list->begin_last_active();
 112            it != native_browser_list->end_last_active(); ++it) {
 113         Browser* last_active = *it;
 114         if (last_active && last_active->is_type_tabbed()) {
 115           window = last_active->window();
 116           DCHECK(window);
 117           break;
 118         }
 119       }
 120     }
 121
 122     if (window) {
 123       *bounds = window->GetRestoredBounds();
 124       if (*show_state == ui::SHOW_STATE_DEFAULT && window->IsMaximized())
 125         *show_state = ui::SHOW_STATE_MAXIMIZED;
 126       return true;
 127     }
 128
 129     return false;
 130   }
 131
 132  private:
 133   std::string app_name_;
 134
 135   // If set, is used as the reference browser for GetLastActiveWindowState.
 136   const Browser* browser_;
 137   DISALLOW_COPY_AND_ASSIGN(DefaultStateProvider);
 138 };
 139
 140 class DefaultTargetDisplayProvider : public WindowSizer::TargetDisplayProvider {
 141  public:
 142   DefaultTargetDisplayProvider() {}
 143   virtual ~DefaultTargetDisplayProvider() {}
 144
 145   virtual gfx::Display GetTargetDisplay(
 146       const gfx::Screen* screen,
 147       const gfx::Rect& bounds) const OVERRIDE {
 148 #if defined(USE_ASH)
 149     // Use the target display on ash.
 150     if (chrome::ShouldOpenAshOnStartup()) {
 151       aura::Window* target = ash::Shell::GetTargetRootWindow();
 152       return screen->GetDisplayNearestWindow(target);
 153     }
 154 #endif
 155     // Find the size of the work area of the monitor that intersects the bounds
 156     // of the anchor window.
 157     return screen->GetDisplayMatching(bounds);
 158   }
 159
 160  private:
 161   DISALLOW_COPY_AND_ASSIGN(DefaultTargetDisplayProvider);
 162 };
 163
 164 }  // namespace
 165
 166 ///////////////////////////////////////////////////////////////////////////////
 167 // WindowSizer, public:
 168
 169 WindowSizer::WindowSizer(
 170     scoped_ptr<StateProvider> state_provider,
 171     scoped_ptr<TargetDisplayProvider> target_display_provider,
 172     const Browser* browser)
 173     : state_provider_(state_provider.Pass()),
 174       target_display_provider_(target_display_provider.Pass()),
 175       // TODO(scottmg): NativeScreen is wrong. http://crbug.com/133312
 176       screen_(gfx::Screen::GetNativeScreen()),
 177       browser_(browser) {
 178 }
 179
 180 WindowSizer::WindowSizer(
 181     scoped_ptr<StateProvider> state_provider,
 182     scoped_ptr<TargetDisplayProvider> target_display_provider,
 183     gfx::Screen* screen,
 184     const Browser* browser)
 185     : state_provider_(state_provider.Pass()),
 186       target_display_provider_(target_display_provider.Pass()),
 187       screen_(screen),
 188       browser_(browser) {
 189   DCHECK(screen_);
 190 }
 191
 192 WindowSizer::~WindowSizer() {
 193 }
 194
 195 // static
 196 void WindowSizer::GetBrowserWindowBoundsAndShowState(
 197     const std::string& app_name,
 198     const gfx::Rect& specified_bounds,
 199     const Browser* browser,
 200     gfx::Rect* window_bounds,
 201     ui::WindowShowState* show_state) {
 202   scoped_ptr<StateProvider> state_provider(
 203       new DefaultStateProvider(app_name, browser));
 204   scoped_ptr<TargetDisplayProvider> target_display_provider(
 205       new DefaultTargetDisplayProvider);
 206   const WindowSizer sizer(state_provider.Pass(),
 207                           target_display_provider.Pass(),
 208                           browser);
 209   sizer.DetermineWindowBoundsAndShowState(specified_bounds,
 210                                           window_bounds,
 211                                           show_state);
 212 }
 213
 214 ///////////////////////////////////////////////////////////////////////////////
 215 // WindowSizer, private:
 216
 217 void WindowSizer::DetermineWindowBoundsAndShowState(
 218     const gfx::Rect& specified_bounds,
 219     gfx::Rect* bounds,
 220     ui::WindowShowState* show_state) const {
 221   DCHECK(bounds);
 222   DCHECK(show_state);
 223   // Pre-populate the window state with our default.
 224   *show_state = GetWindowDefaultShowState();
 225   *bounds = specified_bounds;
 226   if (bounds->IsEmpty()) {
 227 #if defined(USE_ASH)
 228     // See if ash should decide the window placement.
 229     if (IsTabbedBrowserInAsh()) {
 230       GetTabbedBrowserBoundsAsh(bounds, show_state);
 231       return;
 232     } else if (browser_ && browser_->host_desktop_type() ==
 233                chrome::HOST_DESKTOP_TYPE_ASH) {
 234       // In ash, saved show state takes precidence.  If you have a
 235       // question or an issue, please contact oshima@chromium.org.
 236       GetSavedWindowBounds(bounds, show_state);
 237     }
 238 #endif
 239     // See if there's last active window's placement information.
 240     if (GetLastActiveWindowBounds(bounds, show_state))
 241       return;
 242     // See if there's saved placement information.
 243     if (GetSavedWindowBounds(bounds, show_state))
 244       return;
 245     // No saved placement, figure out some sensible default size based on
 246     // the user's screen size.
 247     GetDefaultWindowBounds(GetTargetDisplay(gfx::Rect()), bounds);
 248   } else {
 249 #if defined(USE_ASH)
 250     // In case of a popup with an 'unspecified' location in ash, we are
 251     // looking for a good screen location. We are interpreting (0,0) as an
 252     // unspecified location.
 253     if (IsPopupBrowserInAsh() && bounds->origin().IsOrigin()) {
 254       *bounds = ash::Shell::GetInstance()->window_positioner()->
 255           GetPopupPosition(*bounds);
 256       return;
 257     }
 258 #endif
 259     // In case that there was a bound given we need to make sure that it is
 260     // visible and fits on the screen.
 261     // Find the size of the work area of the monitor that intersects the bounds
 262     // of the anchor window. Note: AdjustBoundsToBeVisibleOnMonitorContaining
 263     // does not exactly what we want: It makes only sure that "a minimal part"
 264     // is visible on the screen.
 265     gfx::Rect work_area = screen_->GetDisplayMatching(*bounds).work_area();
 266     // Resize so that it fits.
 267     bounds->AdjustToFit(work_area);
 268   }
 269 }
 270
 271 bool WindowSizer::GetLastActiveWindowBounds(
 272     gfx::Rect* bounds,
 273     ui::WindowShowState* show_state) const {
 274   DCHECK(bounds);
 275   DCHECK(show_state);
 276   if (!state_provider_.get() ||
 277       !state_provider_->GetLastActiveWindowState(bounds, show_state))
 278     return false;
 279   gfx::Rect last_window_bounds = *bounds;
 280   bounds->Offset(kWindowTilePixels, kWindowTilePixels);
 281   AdjustBoundsToBeVisibleOnDisplay(screen_->GetDisplayMatching(*bounds),
 282                                    gfx::Rect(),
 283                                    bounds);
 284   return true;
 285 }
 286
 287 bool WindowSizer::GetSavedWindowBounds(gfx::Rect* bounds,
 288                                        ui::WindowShowState* show_state) const {
 289   DCHECK(bounds);
 290   DCHECK(show_state);
 291   gfx::Rect saved_work_area;
 292   if (!state_provider_.get() ||
 293       !state_provider_->GetPersistentState(bounds,
 294                                            &saved_work_area,
 295                                            show_state))
 296     return false;
 297   AdjustBoundsToBeVisibleOnDisplay(GetTargetDisplay(*bounds),
 298                                    saved_work_area,
 299                                    bounds);
 300   return true;
 301 }
 302
 303 void WindowSizer::GetDefaultWindowBounds(const gfx::Display& display,
 304                                          gfx::Rect* default_bounds) const {
 305   DCHECK(default_bounds);
 306 #if defined(USE_ASH)
 307   // TODO(beng): insufficient but currently necessary. http://crbug.com/133312
 308   if (chrome::ShouldOpenAshOnStartup()) {
 309     *default_bounds = ash::WindowPositioner::GetDefaultWindowBounds(display);
 310     return;
 311   }
 312 #endif
 313   gfx::Rect work_area = display.work_area();
 314
 315   // The default size is either some reasonably wide width, or if the work
 316   // area is narrower, then the work area width less some aesthetic padding.
 317   int default_width = std::min(work_area.width() - 2 * kWindowTilePixels, 1050);
 318   int default_height = work_area.height() - 2 * kWindowTilePixels;
 319
 320   // For wider aspect ratio displays at higher resolutions, we might size the
 321   // window narrower to allow two windows to easily be placed side-by-side.
 322   gfx::Rect screen_size = screen_->GetPrimaryDisplay().bounds();
 323   double width_to_height =
 324     static_cast<double>(screen_size.width()) / screen_size.height();
 325
 326   // The least wide a screen can be to qualify for the halving described above.
 327   static const int kMinScreenWidthForWindowHalving = 1600;
 328   // We assume 16:9/10 is a fairly standard indicator of a wide aspect ratio
 329   // computer display.
 330   if (((width_to_height * 10) >= 16) &&
 331       work_area.width() > kMinScreenWidthForWindowHalving) {
 332     // Halve the work area, subtracting aesthetic padding on either side.
 333     // The padding is set so that two windows, side by side have
 334     // kWindowTilePixels between screen edge and each other.
 335     default_width = static_cast<int>(work_area.width() / 2. -
 336         1.5 * kWindowTilePixels);
 337   }
 338   default_bounds->SetRect(kWindowTilePixels + work_area.x(),
 339                           kWindowTilePixels + work_area.y(),
 340                           default_width, default_height);
 341 }
 342
 343 void WindowSizer::AdjustBoundsToBeVisibleOnDisplay(
 344     const gfx::Display& display,
 345     const gfx::Rect& saved_work_area,
 346     gfx::Rect* bounds) const {
 347   DCHECK(bounds);
 348
 349   // If |bounds| is empty, reset to the default size.
 350   if (bounds->IsEmpty()) {
 351     gfx::Rect default_bounds;
 352     GetDefaultWindowBounds(display, &default_bounds);
 353     if (bounds->height() <= 0)
 354       bounds->set_height(default_bounds.height());
 355     if (bounds->width() <= 0)
 356       bounds->set_width(default_bounds.width());
 357   }
 358
 359   // Ensure the minimum height and width.
 360   bounds->set_height(std::max(kMinVisibleHeight, bounds->height()));
 361   bounds->set_width(std::max(kMinVisibleWidth, bounds->width()));
 362
 363   gfx::Rect work_area = display.work_area();
 364   // Ensure that the title bar is not above the work area.
 365   if (bounds->y() < work_area.y())
 366     bounds->set_y(work_area.y());
 367
 368   // Reposition and resize the bounds if the saved_work_area is different from
 369   // the current work area and the current work area doesn't completely contain
 370   // the bounds.
 371   if (!saved_work_area.IsEmpty() &&
 372       saved_work_area != work_area &&
 373       !work_area.Contains(*bounds)) {
 374     bounds->set_width(std::min(bounds->width(), work_area.width()));
 375     bounds->set_height(std::min(bounds->height(), work_area.height()));
 376     bounds->set_x(
 377         std::max(work_area.x(),
 378                  std::min(bounds->x(), work_area.right() - bounds->width())));
 379     bounds->set_y(
 380         std::max(work_area.y(),
 381                  std::min(bounds->y(), work_area.bottom() - bounds->height())));
 382   }
 383
 384 #if defined(OS_MACOSX)
 385   // Limit the maximum height.  On the Mac the sizer is on the
 386   // bottom-right of the window, and a window cannot be moved "up"
 387   // past the menubar.  If the window is too tall you'll never be able
 388   // to shrink it again.  Windows does not have this limitation
 389   // (e.g. can be resized from the top).
 390   bounds->set_height(std::min(work_area.height(), bounds->height()));
 391
 392   // On mac, we want to be aggressive about repositioning windows that are
 393   // partially offscreen.  If the window is partially offscreen horizontally,
 394   // move it to be flush with the left edge of the work area.
 395   if (bounds->x() < work_area.x() || bounds->right() > work_area.right())
 396     bounds->set_x(work_area.x());
 397
 398   // If the window is partially offscreen vertically, move it to be flush with
 399   // the top of the work area.
 400   if (bounds->y() < work_area.y() || bounds->bottom() > work_area.bottom())
 401     bounds->set_y(work_area.y());
 402 #else
 403   // On non-Mac platforms, we are less aggressive about repositioning.  Simply
 404   // ensure that at least kMinVisibleWidth * kMinVisibleHeight is visible.
 405   const int min_y = work_area.y() + kMinVisibleHeight - bounds->height();
 406   const int min_x = work_area.x() + kMinVisibleWidth - bounds->width();
 407   const int max_y = work_area.bottom() - kMinVisibleHeight;
 408   const int max_x = work_area.right() - kMinVisibleWidth;
 409   bounds->set_y(std::max(min_y, std::min(max_y, bounds->y())));
 410   bounds->set_x(std::max(min_x, std::min(max_x, bounds->x())));
 411 #endif  // defined(OS_MACOSX)
 412 }
 413
 414 gfx::Display WindowSizer::GetTargetDisplay(const gfx::Rect& bounds) const {
 415   return target_display_provider_->GetTargetDisplay(screen_, bounds);
 416 }
 417
 418 ui::WindowShowState WindowSizer::GetWindowDefaultShowState() const {
 419   if (!browser_)
 420     return ui::SHOW_STATE_DEFAULT;
 421
 422   // Only tabbed browsers use the command line or preference state, with the
 423   // exception of devtools.
 424   bool show_state = !browser_->is_type_tabbed() && !browser_->is_devtools();
 425
 426 #if defined(USE_AURA)
 427   // We use the apps save state on aura.
 428   show_state &= !browser_->is_app();
 429 #endif
 430
 431   if (show_state)
 432     return browser_->initial_show_state();
 433
 434   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kStartMaximized))
 435     return ui::SHOW_STATE_MAXIMIZED;
 436
 437   if (browser_->initial_show_state() != ui::SHOW_STATE_DEFAULT)
 438     return browser_->initial_show_state();
 439
 440   // Otherwise we use the default which can be overridden later on.
 441   return ui::SHOW_STATE_DEFAULT;
 442 }
 443
 444 #if defined(USE_ASH)
 445 bool WindowSizer::IsTabbedBrowserInAsh() const {
 446   return browser_ &&
 447       browser_->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_ASH &&
 448       browser_->is_type_tabbed();
 449 }
 450
 451 bool WindowSizer::IsPopupBrowserInAsh() const {
 452   return browser_ &&
 453       browser_->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_ASH &&
 454       browser_->is_type_popup();
 455 }
 456 #endif