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