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/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 // 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(),
 146         internal::kShellWindowId_DockedContainer);
 147     internal::DockedWindowLayoutManager* dock_layout =
 148         static_cast<internal::DockedWindowLayoutManager*>(
 149             dock_container->layout_manager());
 150
 151     work_area.Union(dock_layout->docked_bounds());
 152     work_area = ScreenUtil::ConvertRectFromScreen(GetTarget()->parent(),
 153                                                  work_area);
 154     if (details().size_change_direction & kBoundsChangeDirection_Horizontal) {
 155       if (IsRightEdge(details().window_component) &&
 156           new_bounds.right() < work_area.x() + kMinimumOnScreenArea) {
 157         int delta = work_area.x() + kMinimumOnScreenArea - new_bounds.right();
 158         new_bounds.set_width(new_bounds.width() + delta);
 159       } else if (new_bounds.x() > work_area.right() - kMinimumOnScreenArea) {
 160         int width = new_bounds.right() - work_area.right() +
 161                     kMinimumOnScreenArea;
 162         new_bounds.set_x(work_area.right() - kMinimumOnScreenArea);
 163         new_bounds.set_width(width);
 164       }
 165     }
 166     if (details().size_change_direction & kBoundsChangeDirection_Vertical) {
 167       if (!IsBottomEdge(details().window_component) &&
 168           new_bounds.y() > work_area.bottom() - kMinimumOnScreenArea) {
 169         int height = new_bounds.bottom() - work_area.bottom() +
 170                      kMinimumOnScreenArea;
 171         new_bounds.set_y(work_area.bottom() - kMinimumOnScreenArea);
 172         new_bounds.set_height(height);
 173       } else if (details().window_component == HTBOTTOM ||
 174                  details().window_component == HTBOTTOMRIGHT ||
 175                  details().window_component == HTBOTTOMLEFT) {
 176         // Update bottom edge to stay in the work area when we are resizing
 177         // by dragging the bottom edge or corners.
 178         if (new_bounds.bottom() > work_area.bottom())
 179           new_bounds.Inset(0, 0, 0,
 180                            new_bounds.bottom() - work_area.bottom());
 181       }
 182     }
 183     if (details().bounds_change & kBoundsChange_Repositions &&
 184         new_bounds.y() < 0) {
 185       int delta = new_bounds.y();
 186       new_bounds.set_y(0);
 187       new_bounds.set_height(new_bounds.height() + delta);
 188     }
 189   }
 190
 191   if (details().bounds_change & kBoundsChange_Repositions) {
 192     // When we might want to reposition a window which is also restored to its
 193     // previous size, to keep the cursor within the dragged window.
 194     if (!details().restore_bounds.IsEmpty()) {
 195       // However - it is not desirable to change the origin if the window would
 196       // be still hit by the cursor.
 197       if (details().initial_location_in_parent.x() >
 198           details().initial_bounds_in_parent.x() +
 199           details().restore_bounds.width())
 200         new_bounds.set_x(location.x() - details().restore_bounds.width() / 2);
 201     }
 202
 203     // Make sure that |new_bounds| doesn't leave any of the displays.  Note that
 204     // the |work_area| above isn't good for this check since it is the work area
 205     // for the current display but the window can move to a different one.
 206     aura::Window* parent = GetTarget()->parent();
 207     gfx::Point passed_location_in_screen(passed_location);
 208     wm::ConvertPointToScreen(parent, &passed_location_in_screen);
 209     gfx::Rect near_passed_location(passed_location_in_screen, gfx::Size());
 210     // Use a pointer location (matching the logic in DragWindowResizer) to
 211     // calculate the target display after the drag.
 212     const gfx::Display& display =
 213         Shell::GetScreen()->GetDisplayMatching(near_passed_location);
 214     aura::Window* dock_container = Shell::GetContainer(
 215         wm::GetRootWindowMatching(near_passed_location),
 216         internal::kShellWindowId_DockedContainer);
 217     internal::DockedWindowLayoutManager* dock_layout =
 218         static_cast<internal::DockedWindowLayoutManager*>(
 219             dock_container->layout_manager());
 220
 221     gfx::Rect screen_work_area = display.work_area();
 222     screen_work_area.Union(dock_layout->docked_bounds());
 223     screen_work_area.Inset(kMinimumOnScreenArea, 0);
 224     gfx::Rect new_bounds_in_screen =
 225         ScreenUtil::ConvertRectToScreen(parent, new_bounds);
 226     if (!screen_work_area.Intersects(new_bounds_in_screen)) {
 227       // Make sure that the x origin does not leave the current display.
 228       new_bounds_in_screen.set_x(
 229           std::max(screen_work_area.x() - new_bounds.width(),
 230                    std::min(screen_work_area.right(),
 231                             new_bounds_in_screen.x())));
 232       new_bounds =
 233           ScreenUtil::ConvertRectFromScreen(parent, new_bounds_in_screen);
 234     }
 235   }
 236
 237   return new_bounds;
 238 }
 239
 240 // static
 241 bool WindowResizer::IsBottomEdge(int window_component) {
 242   return window_component == HTBOTTOMLEFT ||
 243       window_component == HTBOTTOM ||
 244       window_component == HTBOTTOMRIGHT ||
 245       window_component == HTGROWBOX;
 246 }
 247
 248 void WindowResizer::AdjustDeltaForTouchResize(int* delta_x, int* delta_y) {
 249   if (details().source != aura::client::WINDOW_MOVE_SOURCE_TOUCH ||
 250       !(details().bounds_change & kBoundsChange_Resizes))
 251     return;
 252
 253   if (details().size_change_direction & kBoundsChangeDirection_Horizontal) {
 254     if (IsRightEdge(details().window_component)) {
 255       *delta_x += details().initial_location_in_parent.x() -
 256           details().initial_bounds_in_parent.right();
 257     } else {
 258       *delta_x += details().initial_location_in_parent.x() -
 259           details().initial_bounds_in_parent.x();
 260     }
 261   }
 262   if (details().size_change_direction & kBoundsChangeDirection_Vertical) {
 263     if (IsBottomEdge(details().window_component)) {
 264       *delta_y += details().initial_location_in_parent.y() -
 265           details().initial_bounds_in_parent.bottom();
 266     } else {
 267       *delta_y += details().initial_location_in_parent.y() -
 268           details().initial_bounds_in_parent.y();
 269     }
 270   }
 271 }
 272
 273 gfx::Point WindowResizer::GetOriginForDrag(int delta_x, int delta_y) {
 274   gfx::Point origin = details().initial_bounds_in_parent.origin();
 275   if (details().bounds_change & kBoundsChange_Repositions) {
 276     int pos_change_direction = GetPositionChangeDirectionForWindowComponent(
 277         details().window_component);
 278     if (pos_change_direction & kBoundsChangeDirection_Horizontal)
 279       origin.Offset(delta_x, 0);
 280     if (pos_change_direction & kBoundsChangeDirection_Vertical)
 281       origin.Offset(0, delta_y);
 282   }
 283   return origin;
 284 }
 285
 286 gfx::Size WindowResizer::GetSizeForDrag(int* delta_x, int* delta_y) {
 287   gfx::Size size = details().initial_bounds_in_parent.size();
 288   if (details().bounds_change & kBoundsChange_Resizes) {
 289     gfx::Size min_size = GetTarget()->delegate()->GetMinimumSize();
 290     size.SetSize(GetWidthForDrag(min_size.width(), delta_x),
 291                  GetHeightForDrag(min_size.height(), delta_y));
 292   } else if (!details().restore_bounds.IsEmpty()) {
 293     size = details().restore_bounds.size();
 294   }
 295   return size;
 296 }
 297
 298 int WindowResizer::GetWidthForDrag(int min_width, int* delta_x) {
 299   int width = details().initial_bounds_in_parent.width();
 300   if (details().size_change_direction & kBoundsChangeDirection_Horizontal) {
 301     // Along the right edge, positive delta_x increases the window size.
 302     int x_multiplier = IsRightEdge(details().window_component) ? 1 : -1;
 303     width += x_multiplier * (*delta_x);
 304
 305     // Ensure we don't shrink past the minimum width and clamp delta_x
 306     // for the window origin computation.
 307     if (width < min_width) {
 308       width = min_width;
 309       *delta_x = -x_multiplier * (details().initial_bounds_in_parent.width() -
 310                                   min_width);
 311     }
 312
 313     // And don't let the window go bigger than the display.
 314     int max_width = Shell::GetScreen()->GetDisplayNearestWindow(
 315         GetTarget()).bounds().width();
 316     gfx::Size max_size = GetTarget()->delegate()->GetMaximumSize();
 317     if (max_size.width() != 0)
 318       max_width = std::min(max_width, max_size.width());
 319     if (width > max_width) {
 320       width = max_width;
 321       *delta_x = -x_multiplier * (details().initial_bounds_in_parent.width() -
 322                                   max_width);
 323     }
 324   }
 325   return width;
 326 }
 327
 328 int WindowResizer::GetHeightForDrag(int min_height, int* delta_y) {
 329   int height = details().initial_bounds_in_parent.height();
 330   if (details().size_change_direction & kBoundsChangeDirection_Vertical) {
 331     // Along the bottom edge, positive delta_y increases the window size.
 332     int y_multiplier = IsBottomEdge(details().window_component) ? 1 : -1;
 333     height += y_multiplier * (*delta_y);
 334
 335     // Ensure we don't shrink past the minimum height and clamp delta_y
 336     // for the window origin computation.
 337     if (height < min_height) {
 338       height = min_height;
 339       *delta_y = -y_multiplier * (details().initial_bounds_in_parent.height() -
 340                                   min_height);
 341     }
 342
 343     // And don't let the window go bigger than the display.
 344     int max_height = Shell::GetScreen()->GetDisplayNearestWindow(
 345         GetTarget()).bounds().height();
 346     gfx::Size max_size = GetTarget()->delegate()->GetMaximumSize();
 347     if (max_size.height() != 0)
 348       max_height = std::min(max_height, max_size.height());
 349     if (height > max_height) {
 350       height = max_height;
 351       *delta_y = -y_multiplier * (details().initial_bounds_in_parent.height() -
 352                                   max_height);
 353     }
 354   }
 355   return height;
 356 }
 357
 358 }  // namespace ash