Prevents panels attached to shelf from docking

ash/wm/window_resizer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/window_resizer.h"
 
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/coordinate_conversion.h"
 #include "ash/wm/dock/docked_window_layout_manager.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
 
 namespace ash {
 
 namespace {
 
-int GetPositionChangeDirectionForWindowComponent(int window_component) {
-  int pos_change_direction = WindowResizer::kBoundsChangeDirection_None;
-  switch (window_component) {
-    case HTTOPLEFT:
-    case HTBOTTOMRIGHT:
-    case HTGROWBOX:
-    case HTCAPTION:
-      pos_change_direction |=
-          WindowResizer::kBoundsChangeDirection_Horizontal |
-          WindowResizer::kBoundsChangeDirection_Vertical;
-      break;
-    case HTTOP:
-    case HTTOPRIGHT:
-    case HTBOTTOM:
-      pos_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
-      break;
-    case HTBOTTOMLEFT:
-    case HTRIGHT:
-    case HTLEFT:
-      pos_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
-      break;
-    default:
-      break;
-  }
-  return pos_change_direction;
-}
-
-int GetSizeChangeDirectionForWindowComponent(int window_component) {
-  int size_change_direction = WindowResizer::kBoundsChangeDirection_None;
-  switch (window_component) {
-    case HTTOPLEFT:
-    case HTTOPRIGHT:
-    case HTBOTTOMLEFT:
-    case HTBOTTOMRIGHT:
-    case HTGROWBOX:
-    case HTCAPTION:
-      size_change_direction |=
-          WindowResizer::kBoundsChangeDirection_Horizontal |
-          WindowResizer::kBoundsChangeDirection_Vertical;
-      break;
-    case HTTOP:
-    case HTBOTTOM:
-      size_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
-      break;
-    case HTRIGHT:
-    case HTLEFT:
-      size_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
-      break;
-    default:
-      break;
-  }
-  return size_change_direction;
-}
-
 // Returns true for resize components along the right edge, where a drag in
 // positive x will make the window larger.
 bool IsRightEdge(int window_component) {
   return window_component == HTTOPRIGHT ||
       window_component == HTRIGHT ||
       window_component == HTBOTTOMRIGHT ||
       window_component == HTGROWBOX;
 }
 
 }  // namespace
 
 // static
 const int WindowResizer::kBoundsChange_None = 0;
 // static
 const int WindowResizer::kBoundsChange_Repositions = 1;
 // static
 const int WindowResizer::kBoundsChange_Resizes = 2;
 
 // static
 const int WindowResizer::kBoundsChangeDirection_None = 0;
 // static
 const int WindowResizer::kBoundsChangeDirection_Horizontal = 1;
 // static
 const int WindowResizer::kBoundsChangeDirection_Vertical = 2;
 
-WindowResizer::Details::Details()
-    : window(NULL),
-      window_state(NULL),
-      window_component(HTNOWHERE),
-      bounds_change(0),
-      position_change_direction(0),
-      size_change_direction(0),
-      is_resizable(false),
-      source(aura::client::WINDOW_MOVE_SOURCE_MOUSE) {
-}
-
-WindowResizer::Details::Details(aura::Window* window,
-                                const gfx::Point& location,
-                                int window_component,
-                                aura::client::WindowMoveSource source)
-    : window(window),
-      window_state(wm::GetWindowState(window)),
-      initial_bounds_in_parent(window->bounds()),
-      restore_bounds(gfx::Rect()),
-      initial_location_in_parent(location),
-      initial_opacity(window->layer()->opacity()),
-      window_component(window_component),
-      bounds_change(GetBoundsChangeForWindowComponent(window_component)),
-      position_change_direction(
-          GetPositionChangeDirectionForWindowComponent(window_component)),
-      size_change_direction(
-          GetSizeChangeDirectionForWindowComponent(window_component)),
-      is_resizable(bounds_change != kBoundsChangeDirection_None),
-      source(source) {
-  if (window_state->IsNormalShowState() &&
-      window_state->HasRestoreBounds() &&
-      window_component == HTCAPTION)
-    restore_bounds = window_state->GetRestoreBoundsInScreen();
-}
-
-WindowResizer::Details::~Details() {
-}
-
 WindowResizer::WindowResizer() {
 }
 
+WindowResizer::WindowResizer(wm::WindowState* window_state)
+    : window_state_(window_state) {
+  DCHECK(window_state_->drag_details());
+}
+
 WindowResizer::~WindowResizer() {
 }
 
 // static
 int WindowResizer::GetBoundsChangeForWindowComponent(int component) {
   int bounds_change = WindowResizer::kBoundsChange_None;
   switch (component) {
     case HTTOPLEFT:
     case HTTOP:
     case HTTOPRIGHT:
@@ skipping 10 matching lines @@
     case HTBOTTOM:
     case HTGROWBOX:
       bounds_change |= WindowResizer::kBoundsChange_Resizes;
       break;
     default:
       break;
   }
   return bounds_change;
 }
 
-// static
+//static
+int WindowResizer::GetPositionChangeDirectionForWindowComponent(
+    int window_component) {
+  int pos_change_direction = WindowResizer::kBoundsChangeDirection_None;
+  switch (window_component) {
+    case HTTOPLEFT:
+    case HTBOTTOMRIGHT:
+    case HTGROWBOX:
+    case HTCAPTION:
+      pos_change_direction |=
+          WindowResizer::kBoundsChangeDirection_Horizontal |
+          WindowResizer::kBoundsChangeDirection_Vertical;
+      break;
+    case HTTOP:
+    case HTTOPRIGHT:
+    case HTBOTTOM:
+      pos_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
+      break;
+    case HTBOTTOMLEFT:
+    case HTRIGHT:
+    case HTLEFT:
+      pos_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
+      break;
+    default:
+      break;
+  }
+  return pos_change_direction;
+}
+
 gfx::Rect WindowResizer::CalculateBoundsForDrag(
-    const Details& details,
     const gfx::Point& passed_location) {
-  if (!details.is_resizable)
-    return details.initial_bounds_in_parent;
+  if (!details().is_resizable)
+    return details().initial_bounds_in_parent;
 
   gfx::Point location = passed_location;
-  int delta_x = location.x() - details.initial_location_in_parent.x();
-  int delta_y = location.y() - details.initial_location_in_parent.y();
+  int delta_x = location.x() - details().initial_location_in_parent.x();
+  int delta_y = location.y() - details().initial_location_in_parent.y();
 
-  AdjustDeltaForTouchResize(details, &delta_x, &delta_y);
+  AdjustDeltaForTouchResize(&delta_x, &delta_y);
 
   // The minimize size constraint may limit how much we change the window
   // position.  For example, dragging the left edge to the right should stop
   // repositioning the window when the minimize size is reached.
-  gfx::Size size = GetSizeForDrag(details, &delta_x, &delta_y);
-  gfx::Point origin = GetOriginForDrag(details, delta_x, delta_y);
+  gfx::Size size = GetSizeForDrag(&delta_x, &delta_y);
+  gfx::Point origin = GetOriginForDrag(delta_x, delta_y);
   gfx::Rect new_bounds(origin, size);
 
   // Sizing has to keep the result on the screen. Note that this correction
   // has to come first since it might have an impact on the origin as well as
   // on the size.
-  if (details.bounds_change & kBoundsChange_Resizes) {
+  if (details().bounds_change & kBoundsChange_Resizes) {
     gfx::Rect work_area =
-        Shell::GetScreen()->GetDisplayNearestWindow(details.window).work_area();
+        Shell::GetScreen()->GetDisplayNearestWindow(GetTarget()).work_area();
     aura::Window* dock_container = Shell::GetContainer(
-        details.window->GetRootWindow(),
+        GetTarget()->GetRootWindow(),
         internal::kShellWindowId_DockedContainer);
     internal::DockedWindowLayoutManager* dock_layout =
         static_cast<internal::DockedWindowLayoutManager*>(
             dock_container->layout_manager());
 
     work_area.Union(dock_layout->docked_bounds());
-    work_area = ScreenAsh::ConvertRectFromScreen(details.window->parent(),
+    work_area = ScreenAsh::ConvertRectFromScreen(GetTarget()->parent(),
                                                  work_area);
-    if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
-      if (IsRightEdge(details.window_component) &&
+    if (details().size_change_direction & kBoundsChangeDirection_Horizontal) {
+      if (IsRightEdge(details().window_component) &&
           new_bounds.right() < work_area.x() + kMinimumOnScreenArea) {
         int delta = work_area.x() + kMinimumOnScreenArea - new_bounds.right();
         new_bounds.set_width(new_bounds.width() + delta);
       } else if (new_bounds.x() > work_area.right() - kMinimumOnScreenArea) {
         int width = new_bounds.right() - work_area.right() +
                     kMinimumOnScreenArea;
         new_bounds.set_x(work_area.right() - kMinimumOnScreenArea);
         new_bounds.set_width(width);
       }
     }
-    if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
-      if (!IsBottomEdge(details.window_component) &&
+    if (details().size_change_direction & kBoundsChangeDirection_Vertical) {
+      if (!IsBottomEdge(details().window_component) &&
           new_bounds.y() > work_area.bottom() - kMinimumOnScreenArea) {
         int height = new_bounds.bottom() - work_area.bottom() +
                      kMinimumOnScreenArea;
         new_bounds.set_y(work_area.bottom() - kMinimumOnScreenArea);
         new_bounds.set_height(height);
-      } else if (details.window_component == HTBOTTOM ||
-                 details.window_component == HTBOTTOMRIGHT ||
-                 details.window_component == HTBOTTOMLEFT) {
+      } else if (details().window_component == HTBOTTOM ||
+                 details().window_component == HTBOTTOMRIGHT ||
+                 details().window_component == HTBOTTOMLEFT) {
         // Update bottom edge to stay in the work area when we are resizing
         // by dragging the bottom edge or corners.
         if (new_bounds.bottom() > work_area.bottom())
           new_bounds.Inset(0, 0, 0,
                            new_bounds.bottom() - work_area.bottom());
       }
     }
-    if (details.bounds_change & kBoundsChange_Repositions &&
+    if (details().bounds_change & kBoundsChange_Repositions &&
         new_bounds.y() < 0) {
       int delta = new_bounds.y();
       new_bounds.set_y(0);
       new_bounds.set_height(new_bounds.height() + delta);
     }
   }
 
-  if (details.bounds_change & kBoundsChange_Repositions) {
+  if (details().bounds_change & kBoundsChange_Repositions) {
     // When we might want to reposition a window which is also restored to its
     // previous size, to keep the cursor within the dragged window.
-    if (!details.restore_bounds.IsEmpty()) {
+    if (!details().restore_bounds.IsEmpty()) {
       // However - it is not desirable to change the origin if the window would
       // be still hit by the cursor.
-      if (details.initial_location_in_parent.x() >
-          details.initial_bounds_in_parent.x() + details.restore_bounds.width())
-        new_bounds.set_x(location.x() - details.restore_bounds.width() / 2);
+      if (details().initial_location_in_parent.x() >
+          details().initial_bounds_in_parent.x() +
+          details().restore_bounds.width())
+        new_bounds.set_x(location.x() - details().restore_bounds.width() / 2);
     }
 
     // Make sure that |new_bounds| doesn't leave any of the displays.  Note that
     // the |work_area| above isn't good for this check since it is the work area
     // for the current display but the window can move to a different one.
-    aura::Window* parent = details.window->parent();
+    aura::Window* parent = GetTarget()->parent();
     gfx::Point passed_location_in_screen(passed_location);
     wm::ConvertPointToScreen(parent, &passed_location_in_screen);
     gfx::Rect near_passed_location(passed_location_in_screen, gfx::Size());
     // Use a pointer location (matching the logic in DragWindowResizer) to
     // calculate the target display after the drag.
     const gfx::Display& display =
         Shell::GetScreen()->GetDisplayMatching(near_passed_location);
     aura::Window* dock_container = Shell::GetContainer(
         wm::GetRootWindowMatching(near_passed_location),
         internal::kShellWindowId_DockedContainer);
@@ skipping 21 matching lines @@
 }
 
 // static
 bool WindowResizer::IsBottomEdge(int window_component) {
   return window_component == HTBOTTOMLEFT ||
       window_component == HTBOTTOM ||
       window_component == HTBOTTOMRIGHT ||
       window_component == HTGROWBOX;
 }
 
-// static
-void WindowResizer::AdjustDeltaForTouchResize(const Details& details,
-                                              int* delta_x,
-                                              int* delta_y) {
-  if (details.source != aura::client::WINDOW_MOVE_SOURCE_TOUCH ||
-      !(details.bounds_change & kBoundsChange_Resizes))
+void WindowResizer::AdjustDeltaForTouchResize(int* delta_x, int* delta_y) {
+  if (details().source != aura::client::WINDOW_MOVE_SOURCE_TOUCH ||
+      !(details().bounds_change & kBoundsChange_Resizes))
     return;
 
-  if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
-    if (IsRightEdge(details.window_component)) {
-      *delta_x += details.initial_location_in_parent.x() -
-          details.initial_bounds_in_parent.right();
+  if (details().size_change_direction & kBoundsChangeDirection_Horizontal) {
+    if (IsRightEdge(details().window_component)) {
+      *delta_x += details().initial_location_in_parent.x() -
+          details().initial_bounds_in_parent.right();
     } else {
-      *delta_x += details.initial_location_in_parent.x() -
-          details.initial_bounds_in_parent.x();
+      *delta_x += details().initial_location_in_parent.x() -
+          details().initial_bounds_in_parent.x();
     }
   }
-  if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
-    if (IsBottomEdge(details.window_component)) {
-      *delta_y += details.initial_location_in_parent.y() -
-          details.initial_bounds_in_parent.bottom();
+  if (details().size_change_direction & kBoundsChangeDirection_Vertical) {
+    if (IsBottomEdge(details().window_component)) {
+      *delta_y += details().initial_location_in_parent.y() -
+          details().initial_bounds_in_parent.bottom();
     } else {
-      *delta_y += details.initial_location_in_parent.y() -
-          details.initial_bounds_in_parent.y();
+      *delta_y += details().initial_location_in_parent.y() -
+          details().initial_bounds_in_parent.y();
     }
   }
 }
 
-// static
-gfx::Point WindowResizer::GetOriginForDrag(const Details& details,
-                                           int delta_x,
-                                           int delta_y) {
-  gfx::Point origin = details.initial_bounds_in_parent.origin();
-  if (details.bounds_change & kBoundsChange_Repositions) {
-    int pos_change_direction =
-        GetPositionChangeDirectionForWindowComponent(details.window_component);
+gfx::Point WindowResizer::GetOriginForDrag(int delta_x, int delta_y) {
+  gfx::Point origin = details().initial_bounds_in_parent.origin();
+  if (details().bounds_change & kBoundsChange_Repositions) {
+    int pos_change_direction = GetPositionChangeDirectionForWindowComponent(
+        details().window_component);
     if (pos_change_direction & kBoundsChangeDirection_Horizontal)
       origin.Offset(delta_x, 0);
     if (pos_change_direction & kBoundsChangeDirection_Vertical)
       origin.Offset(0, delta_y);
   }
   return origin;
 }
 
-// static
-gfx::Size WindowResizer::GetSizeForDrag(const Details& details,
-                                        int* delta_x,
-                                        int* delta_y) {
-  gfx::Size size = details.initial_bounds_in_parent.size();
-  if (details.bounds_change & kBoundsChange_Resizes) {
-    gfx::Size min_size = details.window->delegate()->GetMinimumSize();
-    size.SetSize(GetWidthForDrag(details, min_size.width(), delta_x),
-                 GetHeightForDrag(details, min_size.height(), delta_y));
-  } else if (!details.restore_bounds.IsEmpty()) {
-    size = details.restore_bounds.size();
+gfx::Size WindowResizer::GetSizeForDrag(int* delta_x, int* delta_y) {
+  gfx::Size size = details().initial_bounds_in_parent.size();
+  if (details().bounds_change & kBoundsChange_Resizes) {
+    gfx::Size min_size = GetTarget()->delegate()->GetMinimumSize();
+    size.SetSize(GetWidthForDrag(min_size.width(), delta_x),
+                 GetHeightForDrag(min_size.height(), delta_y));
+  } else if (!details().restore_bounds.IsEmpty()) {
+    size = details().restore_bounds.size();
   }
   return size;
 }
 
-// static
-int WindowResizer::GetWidthForDrag(const Details& details,
-                                   int min_width,
-                                   int* delta_x) {
-  int width = details.initial_bounds_in_parent.width();
-  if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
+int WindowResizer::GetWidthForDrag(int min_width, int* delta_x) {
+  int width = details().initial_bounds_in_parent.width();
+  if (details().size_change_direction & kBoundsChangeDirection_Horizontal) {
     // Along the right edge, positive delta_x increases the window size.
-    int x_multiplier = IsRightEdge(details.window_component) ? 1 : -1;
+    int x_multiplier = IsRightEdge(details().window_component) ? 1 : -1;
     width += x_multiplier * (*delta_x);
 
     // Ensure we don't shrink past the minimum width and clamp delta_x
     // for the window origin computation.
     if (width < min_width) {
       width = min_width;
-      *delta_x = -x_multiplier * (details.initial_bounds_in_parent.width() -
+      *delta_x = -x_multiplier * (details().initial_bounds_in_parent.width() -
                                   min_width);
     }
 
     // And don't let the window go bigger than the display.
     int max_width = Shell::GetScreen()->GetDisplayNearestWindow(
-        details.window).bounds().width();
-    gfx::Size max_size = details.window->delegate()->GetMaximumSize();
+        GetTarget()).bounds().width();
+    gfx::Size max_size = GetTarget()->delegate()->GetMaximumSize();
     if (max_size.width() != 0)
       max_width = std::min(max_width, max_size.width());
     if (width > max_width) {
       width = max_width;
-      *delta_x = -x_multiplier * (details.initial_bounds_in_parent.width() -
+      *delta_x = -x_multiplier * (details().initial_bounds_in_parent.width() -
                                   max_width);
     }
   }
   return width;
 }
 
-// static
-int WindowResizer::GetHeightForDrag(const Details& details,
-                                    int min_height,
-                                    int* delta_y) {
-  int height = details.initial_bounds_in_parent.height();
-  if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
+int WindowResizer::GetHeightForDrag(int min_height, int* delta_y) {
+  int height = details().initial_bounds_in_parent.height();
+  if (details().size_change_direction & kBoundsChangeDirection_Vertical) {
     // Along the bottom edge, positive delta_y increases the window size.
-    int y_multiplier = IsBottomEdge(details.window_component) ? 1 : -1;
+    int y_multiplier = IsBottomEdge(details().window_component) ? 1 : -1;
     height += y_multiplier * (*delta_y);
 
     // Ensure we don't shrink past the minimum height and clamp delta_y
     // for the window origin computation.
     if (height < min_height) {
       height = min_height;
-      *delta_y = -y_multiplier * (details.initial_bounds_in_parent.height() -
+      *delta_y = -y_multiplier * (details().initial_bounds_in_parent.height() -
                                   min_height);
     }
 
     // And don't let the window go bigger than the display.
     int max_height = Shell::GetScreen()->GetDisplayNearestWindow(
-        details.window).bounds().height();
-    gfx::Size max_size = details.window->delegate()->GetMaximumSize();
+        GetTarget()).bounds().height();
+    gfx::Size max_size = GetTarget()->delegate()->GetMaximumSize();
     if (max_size.height() != 0)
       max_height = std::min(max_height, max_size.height());
     if (height > max_height) {
       height = max_height;
-      *delta_y = -y_multiplier * (details.initial_bounds_in_parent.height() -
+      *delta_y = -y_multiplier * (details().initial_bounds_in_parent.height() -
                                   max_height);
     }
   }
   return height;
 }
 
-}  // namespace aura
+}  // namespace ash