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