Move WindowResizer to CoreWM.

ash/wm/window_resizer.cc

Index: ash/wm/window_resizer.cc
===================================================================
--- ash/wm/window_resizer.cc	(revision 173169)
+++ ash/wm/window_resizer.cc	(working copy)
@@ -1,372 +0,0 @@
-// 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/wm/property_util.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_component(HTNOWHERE),
-      bounds_change(0),
-      position_change_direction(0),
-      size_change_direction(0),
-      is_resizable(false) {
-}
-
-WindowResizer::Details::Details(aura::Window* window,
-                                const gfx::Point& location,
-                                int window_component)
-    : window(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) {
-  if (wm::IsWindowNormal(window) &&
-      GetRestoreBoundsInScreen(window) &&
-      window_component == HTCAPTION)
-    restore_bounds = *GetRestoreBoundsInScreen(window);
-}
-
-WindowResizer::Details::~Details() {
-}
-
-WindowResizer::WindowResizer() {
-}
-
-WindowResizer::~WindowResizer() {
-}
-
-// static
-int WindowResizer::GetBoundsChangeForWindowComponent(int component) {
-  int bounds_change = WindowResizer::kBoundsChange_None;
-  switch (component) {
-    case HTTOPLEFT:
-    case HTTOP:
-    case HTTOPRIGHT:
-    case HTLEFT:
-    case HTBOTTOMLEFT:
-      bounds_change |= WindowResizer::kBoundsChange_Repositions |
-                      WindowResizer::kBoundsChange_Resizes;
-      break;
-    case HTCAPTION:
-      bounds_change |= WindowResizer::kBoundsChange_Repositions;
-      break;
-    case HTRIGHT:
-    case HTBOTTOMRIGHT:
-    case HTBOTTOM:
-    case HTGROWBOX:
-      bounds_change |= WindowResizer::kBoundsChange_Resizes;
-      break;
-    default:
-      break;
-  }
-  return bounds_change;
-}
-
-// static
-gfx::Rect WindowResizer::CalculateBoundsForDrag(
-    const Details& details,
-    const gfx::Point& passed_location) {
-  if (!details.is_resizable)
-    return details.initial_bounds_in_parent;
-
-  gfx::Point location = passed_location;
-  gfx::Rect work_area =
-      ScreenAsh::GetDisplayWorkAreaBoundsInParent(details.window);
-
-  int delta_x = location.x() - details.initial_location_in_parent.x();
-  int delta_y = location.y() - details.initial_location_in_parent.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::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.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) &&
-          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) {
-        // 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 &&
-        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) {
-    // 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()) {
-      // 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);
-    }
-
-    // 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();
-    gfx::Rect new_bounds_in_screen =
-        ScreenAsh::ConvertRectToScreen(parent, new_bounds);
-    const gfx::Display& display =
-        Shell::GetScreen()->GetDisplayMatching(new_bounds_in_screen);
-    gfx::Rect screen_work_area = display.work_area();
-    screen_work_area.Inset(kMinimumOnScreenArea, 0);
-    if (!screen_work_area.Intersects(new_bounds_in_screen)) {
-      // Make sure that the x origin does not leave the current display.
-      new_bounds_in_screen.set_x(
-          std::max(screen_work_area.x() - new_bounds.width(),
-                   std::min(screen_work_area.right(),
-                            new_bounds_in_screen.x())));
-      new_bounds =
-          ScreenAsh::ConvertRectFromScreen(parent, new_bounds_in_screen);
-    }
-  }
-
-  return new_bounds;
-}
-
-// static
-bool WindowResizer::IsBottomEdge(int window_component) {
-  return window_component == HTBOTTOMLEFT ||
-      window_component == HTBOTTOM ||
-      window_component == HTBOTTOMRIGHT ||
-      window_component == HTGROWBOX;
-}
-
-// 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);
-    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();
-  }
-  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) {
-    // Along the right edge, positive delta_x increases the window size.
-    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() -
-                                  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();
-    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() -
-                                  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) {
-    // Along the bottom edge, positive delta_y increases the window size.
-    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() -
-                                  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();
-    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() -
-                                  max_height);
-    }
-  }
-  return height;
-}
-
-}  // namespace aura