src/ash/wm/window_resizer.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 "ash/wm/window_resizer.h"
   6
   7 #include "ash/screen_ash.h"
   8 #include "ash/shell.h"
   9 #include "ash/shell_window_ids.h"
  10 #include "ash/wm/coordinate_conversion.h"
  11 #include "ash/wm/dock/docked_window_layout_manager.h"
  12 #include "ash/wm/window_state.h"
  13 #include "ash/wm/window_util.h"
  14 #include "ui/aura/client/aura_constants.h"
  15 #include "ui/aura/root_window.h"
  16 #include "ui/aura/window.h"
  17 #include "ui/aura/window_delegate.h"
  18 #include "ui/base/hit_test.h"
  19 #include "ui/base/ui_base_types.h"
  20 #include "ui/compositor/scoped_layer_animation_settings.h"
  21 #include "ui/gfx/display.h"
  22 #include "ui/gfx/screen.h"
  23
  24 namespace ash {
  25
  26 namespace {
  27
  28 int GetPositionChangeDirectionForWindowComponent(int window_component) {
  29   int pos_change_direction = WindowResizer::kBoundsChangeDirection_None;
  30   switch (window_component) {
  31     case HTTOPLEFT:
  32     case HTBOTTOMRIGHT:
  33     case HTGROWBOX:
  34     case HTCAPTION:
  35       pos_change_direction |=
  36           WindowResizer::kBoundsChangeDirection_Horizontal |
  37           WindowResizer::kBoundsChangeDirection_Vertical;
  38       break;
  39     case HTTOP:
  40     case HTTOPRIGHT:
  41     case HTBOTTOM:
  42       pos_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
  43       break;
  44     case HTBOTTOMLEFT:
  45     case HTRIGHT:
  46     case HTLEFT:
  47       pos_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
  48       break;
  49     default:
  50       break;
  51   }
  52   return pos_change_direction;
  53 }
  54
  55 int GetSizeChangeDirectionForWindowComponent(int window_component) {
  56   int size_change_direction = WindowResizer::kBoundsChangeDirection_None;
  57   switch (window_component) {
  58     case HTTOPLEFT:
  59     case HTTOPRIGHT:
  60     case HTBOTTOMLEFT:
  61     case HTBOTTOMRIGHT:
  62     case HTGROWBOX:
  63     case HTCAPTION:
  64       size_change_direction |=
  65           WindowResizer::kBoundsChangeDirection_Horizontal |
  66           WindowResizer::kBoundsChangeDirection_Vertical;
  67       break;
  68     case HTTOP:
  69     case HTBOTTOM:
  70       size_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
  71       break;
  72     case HTRIGHT:
  73     case HTLEFT:
  74       size_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
  75       break;
  76     default:
  77       break;
  78   }
  79   return size_change_direction;
  80 }
  81
  82 // Returns true for resize components along the right edge, where a drag in
  83 // positive x will make the window larger.
  84 bool IsRightEdge(int window_component) {
  85   return window_component == HTTOPRIGHT ||
  86       window_component == HTRIGHT ||
  87       window_component == HTBOTTOMRIGHT ||
  88       window_component == HTGROWBOX;
  89 }
  90
  91 }  // namespace
  92
  93 // static
  94 const int WindowResizer::kBoundsChange_None = 0;
  95 // static
  96 const int WindowResizer::kBoundsChange_Repositions = 1;
  97 // static
  98 const int WindowResizer::kBoundsChange_Resizes = 2;
  99
 100 // static
 101 const int WindowResizer::kBoundsChangeDirection_None = 0;
 102 // static
 103 const int WindowResizer::kBoundsChangeDirection_Horizontal = 1;
 104 // static
 105 const int WindowResizer::kBoundsChangeDirection_Vertical = 2;
 106
 107 WindowResizer::Details::Details()
 108     : window(NULL),
 109       window_state(NULL),
 110       window_component(HTNOWHERE),
 111       bounds_change(0),
 112       position_change_direction(0),
 113       size_change_direction(0),
 114       is_resizable(false),
 115       source(aura::client::WINDOW_MOVE_SOURCE_MOUSE) {
 116 }
 117
 118 WindowResizer::Details::Details(aura::Window* window,
 119                                 const gfx::Point& location,
 120                                 int window_component,
 121                                 aura::client::WindowMoveSource source)
 122     : window(window),
 123       window_state(wm::GetWindowState(window)),
 124       initial_bounds_in_parent(window->bounds()),
 125       restore_bounds(gfx::Rect()),
 126       initial_location_in_parent(location),
 127       initial_opacity(window->layer()->opacity()),
 128       window_component(window_component),
 129       bounds_change(GetBoundsChangeForWindowComponent(window_component)),
 130       position_change_direction(
 131           GetPositionChangeDirectionForWindowComponent(window_component)),
 132       size_change_direction(
 133           GetSizeChangeDirectionForWindowComponent(window_component)),
 134       is_resizable(bounds_change != kBoundsChangeDirection_None),
 135       source(source) {
 136   if (window_state->IsNormalShowState() &&
 137       window_state->HasRestoreBounds() &&
 138       window_component == HTCAPTION)
 139     restore_bounds = window_state->GetRestoreBoundsInScreen();
 140 }
 141
 142 WindowResizer::Details::~Details() {
 143 }
 144
 145 WindowResizer::WindowResizer() {
 146 }
 147
 148 WindowResizer::~WindowResizer() {
 149 }
 150
 151 // static
 152 int WindowResizer::GetBoundsChangeForWindowComponent(int component) {
 153   int bounds_change = WindowResizer::kBoundsChange_None;
 154   switch (component) {
 155     case HTTOPLEFT:
 156     case HTTOP:
 157     case HTTOPRIGHT:
 158     case HTLEFT:
 159     case HTBOTTOMLEFT:
 160       bounds_change |= WindowResizer::kBoundsChange_Repositions |
 161                       WindowResizer::kBoundsChange_Resizes;
 162       break;
 163     case HTCAPTION:
 164       bounds_change |= WindowResizer::kBoundsChange_Repositions;
 165       break;
 166     case HTRIGHT:
 167     case HTBOTTOMRIGHT:
 168     case HTBOTTOM:
 169     case HTGROWBOX:
 170       bounds_change |= WindowResizer::kBoundsChange_Resizes;
 171       break;
 172     default:
 173       break;
 174   }
 175   return bounds_change;
 176 }
 177
 178 // static
 179 gfx::Rect WindowResizer::CalculateBoundsForDrag(
 180     const Details& details,
 181     const gfx::Point& passed_location) {
 182   if (!details.is_resizable)
 183     return details.initial_bounds_in_parent;
 184
 185   gfx::Point location = passed_location;
 186   int delta_x = location.x() - details.initial_location_in_parent.x();
 187   int delta_y = location.y() - details.initial_location_in_parent.y();
 188
 189   AdjustDeltaForTouchResize(details, &delta_x, &delta_y);
 190
 191   // The minimize size constraint may limit how much we change the window
 192   // position.  For example, dragging the left edge to the right should stop
 193   // repositioning the window when the minimize size is reached.
 194   gfx::Size size = GetSizeForDrag(details, &delta_x, &delta_y);
 195   gfx::Point origin = GetOriginForDrag(details, delta_x, delta_y);
 196   gfx::Rect new_bounds(origin, size);
 197
 198   // Sizing has to keep the result on the screen. Note that this correction
 199   // has to come first since it might have an impact on the origin as well as
 200   // on the size.
 201   if (details.bounds_change & kBoundsChange_Resizes) {
 202     gfx::Rect work_area =
 203         Shell::GetScreen()->GetDisplayNearestWindow(details.window).work_area();
 204     aura::Window* dock_container = Shell::GetContainer(
 205         details.window->GetRootWindow(),
 206         internal::kShellWindowId_DockedContainer);
 207     internal::DockedWindowLayoutManager* dock_layout =
 208         static_cast<internal::DockedWindowLayoutManager*>(
 209             dock_container->layout_manager());
 210
 211     work_area.Union(dock_layout->docked_bounds());
 212     work_area = ScreenAsh::ConvertRectFromScreen(details.window->parent(),
 213                                                  work_area);
 214     if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
 215       if (IsRightEdge(details.window_component) &&
 216           new_bounds.right() < work_area.x() + kMinimumOnScreenArea) {
 217         int delta = work_area.x() + kMinimumOnScreenArea - new_bounds.right();
 218         new_bounds.set_width(new_bounds.width() + delta);
 219       } else if (new_bounds.x() > work_area.right() - kMinimumOnScreenArea) {
 220         int width = new_bounds.right() - work_area.right() +
 221                     kMinimumOnScreenArea;
 222         new_bounds.set_x(work_area.right() - kMinimumOnScreenArea);
 223         new_bounds.set_width(width);
 224       }
 225     }
 226     if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
 227       if (!IsBottomEdge(details.window_component) &&
 228           new_bounds.y() > work_area.bottom() - kMinimumOnScreenArea) {
 229         int height = new_bounds.bottom() - work_area.bottom() +
 230                      kMinimumOnScreenArea;
 231         new_bounds.set_y(work_area.bottom() - kMinimumOnScreenArea);
 232         new_bounds.set_height(height);
 233       } else if (details.window_component == HTBOTTOM ||
 234                  details.window_component == HTBOTTOMRIGHT ||
 235                  details.window_component == HTBOTTOMLEFT) {
 236         // Update bottom edge to stay in the work area when we are resizing
 237         // by dragging the bottom edge or corners.
 238         if (new_bounds.bottom() > work_area.bottom())
 239           new_bounds.Inset(0, 0, 0,
 240                            new_bounds.bottom() - work_area.bottom());
 241       }
 242     }
 243     if (details.bounds_change & kBoundsChange_Repositions &&
 244         new_bounds.y() < 0) {
 245       int delta = new_bounds.y();
 246       new_bounds.set_y(0);
 247       new_bounds.set_height(new_bounds.height() + delta);
 248     }
 249   }
 250
 251   if (details.bounds_change & kBoundsChange_Repositions) {
 252     // When we might want to reposition a window which is also restored to its
 253     // previous size, to keep the cursor within the dragged window.
 254     if (!details.restore_bounds.IsEmpty()) {
 255       // However - it is not desirable to change the origin if the window would
 256       // be still hit by the cursor.
 257       if (details.initial_location_in_parent.x() >
 258           details.initial_bounds_in_parent.x() + details.restore_bounds.width())
 259         new_bounds.set_x(location.x() - details.restore_bounds.width() / 2);
 260     }
 261
 262     // Make sure that |new_bounds| doesn't leave any of the displays.  Note that
 263     // the |work_area| above isn't good for this check since it is the work area
 264     // for the current display but the window can move to a different one.
 265     aura::Window* parent = details.window->parent();
 266     gfx::Rect new_bounds_in_screen =
 267         ScreenAsh::ConvertRectToScreen(parent, new_bounds);
 268     const gfx::Display& display =
 269         Shell::GetScreen()->GetDisplayMatching(new_bounds_in_screen);
 270     aura::Window* dock_container = Shell::GetContainer(
 271         wm::GetRootWindowMatching(new_bounds_in_screen),
 272         internal::kShellWindowId_DockedContainer);
 273     internal::DockedWindowLayoutManager* dock_layout =
 274         static_cast<internal::DockedWindowLayoutManager*>(
 275             dock_container->layout_manager());
 276
 277     gfx::Rect screen_work_area = display.work_area();
 278     screen_work_area.Union(dock_layout->docked_bounds());
 279     screen_work_area.Inset(kMinimumOnScreenArea, 0);
 280     if (!screen_work_area.Intersects(new_bounds_in_screen)) {
 281       // Make sure that the x origin does not leave the current display.
 282       new_bounds_in_screen.set_x(
 283           std::max(screen_work_area.x() - new_bounds.width(),
 284                    std::min(screen_work_area.right(),
 285                             new_bounds_in_screen.x())));
 286       new_bounds =
 287           ScreenAsh::ConvertRectFromScreen(parent, new_bounds_in_screen);
 288     }
 289   }
 290
 291   return new_bounds;
 292 }
 293
 294 // static
 295 bool WindowResizer::IsBottomEdge(int window_component) {
 296   return window_component == HTBOTTOMLEFT ||
 297       window_component == HTBOTTOM ||
 298       window_component == HTBOTTOMRIGHT ||
 299       window_component == HTGROWBOX;
 300 }
 301
 302 // static
 303 void WindowResizer::AdjustDeltaForTouchResize(const Details& details,
 304                                               int* delta_x,
 305                                               int* delta_y) {
 306   if (details.source != aura::client::WINDOW_MOVE_SOURCE_TOUCH ||
 307       !(details.bounds_change & kBoundsChange_Resizes))
 308     return;
 309
 310   if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
 311     if (IsRightEdge(details.window_component)) {
 312       *delta_x += details.initial_location_in_parent.x() -
 313           details.initial_bounds_in_parent.right();
 314     } else {
 315       *delta_x += details.initial_location_in_parent.x() -
 316           details.initial_bounds_in_parent.x();
 317     }
 318   }
 319   if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
 320     if (IsBottomEdge(details.window_component)) {
 321       *delta_y += details.initial_location_in_parent.y() -
 322           details.initial_bounds_in_parent.bottom();
 323     } else {
 324       *delta_y += details.initial_location_in_parent.y() -
 325           details.initial_bounds_in_parent.y();
 326     }
 327   }
 328 }
 329
 330 // static
 331 gfx::Point WindowResizer::GetOriginForDrag(const Details& details,
 332                                            int delta_x,
 333                                            int delta_y) {
 334   gfx::Point origin = details.initial_bounds_in_parent.origin();
 335   if (details.bounds_change & kBoundsChange_Repositions) {
 336     int pos_change_direction =
 337         GetPositionChangeDirectionForWindowComponent(details.window_component);
 338     if (pos_change_direction & kBoundsChangeDirection_Horizontal)
 339       origin.Offset(delta_x, 0);
 340     if (pos_change_direction & kBoundsChangeDirection_Vertical)
 341       origin.Offset(0, delta_y);
 342   }
 343   return origin;
 344 }
 345
 346 // static
 347 gfx::Size WindowResizer::GetSizeForDrag(const Details& details,
 348                                         int* delta_x,
 349                                         int* delta_y) {
 350   gfx::Size size = details.initial_bounds_in_parent.size();
 351   if (details.bounds_change & kBoundsChange_Resizes) {
 352     gfx::Size min_size = details.window->delegate()->GetMinimumSize();
 353     size.SetSize(GetWidthForDrag(details, min_size.width(), delta_x),
 354                  GetHeightForDrag(details, min_size.height(), delta_y));
 355   } else if (!details.restore_bounds.IsEmpty()) {
 356     size = details.restore_bounds.size();
 357   }
 358   return size;
 359 }
 360
 361 // static
 362 int WindowResizer::GetWidthForDrag(const Details& details,
 363                                    int min_width,
 364                                    int* delta_x) {
 365   int width = details.initial_bounds_in_parent.width();
 366   if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
 367     // Along the right edge, positive delta_x increases the window size.
 368     int x_multiplier = IsRightEdge(details.window_component) ? 1 : -1;
 369     width += x_multiplier * (*delta_x);
 370
 371     // Ensure we don't shrink past the minimum width and clamp delta_x
 372     // for the window origin computation.
 373     if (width < min_width) {
 374       width = min_width;
 375       *delta_x = -x_multiplier * (details.initial_bounds_in_parent.width() -
 376                                   min_width);
 377     }
 378
 379     // And don't let the window go bigger than the display.
 380     int max_width = Shell::GetScreen()->GetDisplayNearestWindow(
 381         details.window).bounds().width();
 382     gfx::Size max_size = details.window->delegate()->GetMaximumSize();
 383     if (max_size.width() != 0)
 384       max_width = std::min(max_width, max_size.width());
 385     if (width > max_width) {
 386       width = max_width;
 387       *delta_x = -x_multiplier * (details.initial_bounds_in_parent.width() -
 388                                   max_width);
 389     }
 390   }
 391   return width;
 392 }
 393
 394 // static
 395 int WindowResizer::GetHeightForDrag(const Details& details,
 396                                     int min_height,
 397                                     int* delta_y) {
 398   int height = details.initial_bounds_in_parent.height();
 399   if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
 400     // Along the bottom edge, positive delta_y increases the window size.
 401     int y_multiplier = IsBottomEdge(details.window_component) ? 1 : -1;
 402     height += y_multiplier * (*delta_y);
 403
 404     // Ensure we don't shrink past the minimum height and clamp delta_y
 405     // for the window origin computation.
 406     if (height < min_height) {
 407       height = min_height;
 408       *delta_y = -y_multiplier * (details.initial_bounds_in_parent.height() -
 409                                   min_height);
 410     }
 411
 412     // And don't let the window go bigger than the display.
 413     int max_height = Shell::GetScreen()->GetDisplayNearestWindow(
 414         details.window).bounds().height();
 415     gfx::Size max_size = details.window->delegate()->GetMaximumSize();
 416     if (max_size.height() != 0)
 417       max_height = std::min(max_height, max_size.height());
 418     if (height > max_height) {
 419       height = max_height;
 420       *delta_y = -y_multiplier * (details.initial_bounds_in_parent.height() -
 421                                   max_height);
 422     }
 423   }
 424   return height;
 425 }
 426
 427 }  // namespace aura