Move some more WM functionality down into ash.

ui/aura_shell/toplevel_window_event_filter.cc

Index: ui/aura_shell/toplevel_window_event_filter.cc
===================================================================
--- ui/aura_shell/toplevel_window_event_filter.cc	(revision 115655)
+++ ui/aura_shell/toplevel_window_event_filter.cc	(working copy)
@@ -1,353 +0,0 @@
-// Copyright (c) 2011 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 "ui/aura_shell/toplevel_window_event_filter.h"
-
-#include "ui/aura/client/aura_constants.h"
-#include "ui/aura/cursor.h"
-#include "ui/aura/event.h"
-#include "ui/aura/root_window.h"
-#include "ui/aura/window.h"
-#include "ui/aura/window_delegate.h"
-#include "ui/aura_shell/window_util.h"
-#include "ui/base/hit_test.h"
-#include "ui/base/ui_base_types.h"
-
-namespace aura_shell {
-
-namespace {
-
-// Identifies the types of bounds change operations performed by a drag to a
-// particular window component.
-const int kBoundsChange_None = 0;
-const int kBoundsChange_Repositions = 1;
-const int kBoundsChange_Resizes = 2;
-
-int GetBoundsChangeForWindowComponent(int window_component) {
-  int bounds_change = kBoundsChange_None;
-  switch (window_component) {
-    case HTTOPLEFT:
-    case HTTOP:
-    case HTTOPRIGHT:
-    case HTLEFT:
-    case HTBOTTOMLEFT:
-      bounds_change |= kBoundsChange_Repositions | kBoundsChange_Resizes;
-      break;
-    case HTCAPTION:
-      bounds_change |= kBoundsChange_Repositions;
-      break;
-    case HTRIGHT:
-    case HTBOTTOMRIGHT:
-    case HTBOTTOM:
-    case HTGROWBOX:
-      bounds_change |= kBoundsChange_Resizes;
-      break;
-    default:
-      break;
-  }
-  return bounds_change;
-}
-
-// Possible directions for changing bounds.
-
-const int kBoundsChangeDirection_None = 0;
-const int kBoundsChangeDirection_Horizontal = 1;
-const int kBoundsChangeDirection_Vertical = 2;
-
-int GetPositionChangeDirectionForWindowComponent(int window_component) {
-  int pos_change_direction = kBoundsChangeDirection_None;
-  switch (window_component) {
-    case HTTOPLEFT:
-    case HTBOTTOMRIGHT:
-    case HTGROWBOX:
-    case HTCAPTION:
-      pos_change_direction |=
-          kBoundsChangeDirection_Horizontal | kBoundsChangeDirection_Vertical;
-      break;
-    case HTTOP:
-    case HTTOPRIGHT:
-    case HTBOTTOM:
-      pos_change_direction |= kBoundsChangeDirection_Vertical;
-      break;
-    case HTBOTTOMLEFT:
-    case HTRIGHT:
-    case HTLEFT:
-      pos_change_direction |= kBoundsChangeDirection_Horizontal;
-      break;
-    default:
-      break;
-  }
-  return pos_change_direction;
-}
-
-int GetSizeChangeDirectionForWindowComponent(int window_component) {
-  int size_change_direction = kBoundsChangeDirection_None;
-  switch (window_component) {
-    case HTTOPLEFT:
-    case HTTOPRIGHT:
-    case HTBOTTOMLEFT:
-    case HTBOTTOMRIGHT:
-    case HTGROWBOX:
-    case HTCAPTION:
-      size_change_direction |=
-          kBoundsChangeDirection_Horizontal | kBoundsChangeDirection_Vertical;
-      break;
-    case HTTOP:
-    case HTBOTTOM:
-      size_change_direction |= kBoundsChangeDirection_Vertical;
-      break;
-    case HTRIGHT:
-    case HTLEFT:
-      size_change_direction |= 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;
-}
-
-// Returns true for resize components in along the bottom edge, where a drag
-// in positive y will make the window larger.
-bool IsBottomEdge(int window_component) {
-  return window_component == HTBOTTOMLEFT ||
-      window_component == HTBOTTOM ||
-      window_component == HTBOTTOMRIGHT ||
-      window_component == HTGROWBOX;
-}
-
-void ToggleMaximizedState(aura::Window* window) {
-  window->SetIntProperty(aura::client::kShowStateKey,
-                         IsWindowMaximized(window) ?
-                             ui::SHOW_STATE_NORMAL : ui::SHOW_STATE_MAXIMIZED);
-}
-
-}  // namespace
-
-ToplevelWindowEventFilter::ToplevelWindowEventFilter(aura::Window* owner)
-    : EventFilter(owner),
-      window_component_(HTNOWHERE) {
-}
-
-ToplevelWindowEventFilter::~ToplevelWindowEventFilter() {
-}
-
-bool ToplevelWindowEventFilter::PreHandleKeyEvent(aura::Window* target,
-                                                  aura::KeyEvent* event) {
-  return false;
-}
-
-bool ToplevelWindowEventFilter::PreHandleMouseEvent(aura::Window* target,
-                                                    aura::MouseEvent* event) {
-  // Process EventFilters implementation first so that it processes
-  // activation/focus first.
-  switch (event->type()) {
-    case ui::ET_MOUSE_MOVED:
-      UpdateWindowComponentForEvent(target, event);
-      break;
-    case ui::ET_MOUSE_PRESSED:
-      // We also update the current window component here because for the
-      // mouse-drag-release-press case, where the mouse is released and
-      // pressed without mouse move event.
-      UpdateWindowComponentForEvent(target, event);
-      if (window_component_ == HTCAPTION &&
-          event->flags() & ui::EF_IS_DOUBLE_CLICK) {
-        ToggleMaximizedState(target);
-      }
-      UpdateLocationFromEvent(target, event);
-      return GetBoundsChangeForWindowComponent(window_component_) !=
-          kBoundsChange_None;
-    case ui::ET_MOUSE_DRAGGED:
-      return HandleDrag(target, event);
-    case ui::ET_MOUSE_RELEASED:
-      window_component_ = HTNOWHERE;
-      break;
-    default:
-      break;
-  }
-  return false;
-}
-
-ui::TouchStatus ToplevelWindowEventFilter::PreHandleTouchEvent(
-    aura::Window* target,
-    aura::TouchEvent* event) {
-  // Process EventFilters implementation first so that it processes
-  // activation/focus first.
-  // TODO(sad): Allow resizing/maximizing etc. from touch?
-  UpdateWindowComponentForEvent(target, event);
-  int bounds_change = GetBoundsChangeForWindowComponent(window_component_);
-  if (bounds_change == kBoundsChange_None)
-    return ui::TOUCH_STATUS_UNKNOWN;
-
-  // Handle touch move by simulate mouse drag with single touch.
-  switch (event->type()) {
-    case ui::ET_TOUCH_PRESSED:
-      UpdateLocationFromEvent(target, event);
-      pressed_touch_ids_.insert(event->touch_id());
-      if (pressed_touch_ids_.size() == 1)
-        return ui::TOUCH_STATUS_START;
-      break;
-    case ui::ET_TOUCH_MOVED:
-      if (pressed_touch_ids_.size() == 1) {
-        if (HandleDrag(target, event))
-          return ui::TOUCH_STATUS_CONTINUE;
-      }
-      break;
-    case ui::ET_TOUCH_RELEASED:
-      pressed_touch_ids_.erase(event->touch_id());
-      if (pressed_touch_ids_.empty()) {
-        window_component_ = HTNOWHERE;
-        return ui::TOUCH_STATUS_END;
-      }
-      break;
-    default:
-      break;
-  }
-  return ui::TOUCH_STATUS_UNKNOWN;
-}
-
-void ToplevelWindowEventFilter::MoveWindowToFront(aura::Window* target) {
-  aura::Window* parent = target->parent();
-  aura::Window* child = target;
-  while (parent) {
-    parent->StackChildAtTop(child);
-    if (parent == owner())
-      break;
-    parent = parent->parent();
-    child = child->parent();
-  }
-}
-
-bool ToplevelWindowEventFilter::HandleDrag(aura::Window* target,
-                                           aura::LocatedEvent* event) {
-  // This function only be triggered to move window
-  // by mouse drag or touch move event.
-  DCHECK(event->type() == ui::ET_MOUSE_DRAGGED ||
-         event->type() == ui::ET_TOUCH_MOVED);
-
-  int bounds_change = GetBoundsChangeForWindowComponent(window_component_);
-  if (bounds_change == kBoundsChange_None)
-    return false;
-
-  // Only a normal/default window can be moved/resized.
-  if (target->GetIntProperty(aura::client::kShowStateKey) !=
-          ui::SHOW_STATE_NORMAL &&
-      target->GetIntProperty(aura::client::kShowStateKey) !=
-          ui::SHOW_STATE_DEFAULT)
-    return false;
-
-  // Dragging a window moves the local coordinate frame, so do arithmetic
-  // in the parent coordinate frame.
-  gfx::Point event_location_in_parent(event->location());
-  aura::Window::ConvertPointToWindow(target, target->parent(),
-                                     &event_location_in_parent);
-  int delta_x = event_location_in_parent.x() - mouse_down_offset_in_parent_.x();
-  int delta_y = event_location_in_parent.y() - mouse_down_offset_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(bounds_change, target, &delta_x, &delta_y);
-  gfx::Point origin = GetOriginForDrag(bounds_change, delta_x, delta_y);
-
-  target->SetBounds(gfx::Rect(origin, size));
-  return true;
-}
-
-void ToplevelWindowEventFilter::UpdateLocationFromEvent(
-    aura::Window* target,
-    aura::LocatedEvent* event) {
-  mouse_down_bounds_ = target->bounds();
-  mouse_down_offset_in_parent_ = event->location();
-  aura::Window::ConvertPointToWindow(target, target->parent(),
-                                     &mouse_down_offset_in_parent_);
-}
-
-void ToplevelWindowEventFilter::UpdateWindowComponentForEvent(
-    aura::Window* target,
-    aura::LocatedEvent* event) {
-  window_component_ =
-      target->delegate()->GetNonClientComponent(event->location());
-}
-
-gfx::Point ToplevelWindowEventFilter::GetOriginForDrag(
-    int bounds_change,
-    int delta_x,
-    int delta_y) const {
-  gfx::Point origin = mouse_down_bounds_.origin();
-  if (bounds_change & kBoundsChange_Repositions) {
-    int pos_change_direction =
-        GetPositionChangeDirectionForWindowComponent(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;
-}
-
-gfx::Size ToplevelWindowEventFilter::GetSizeForDrag(
-    int bounds_change,
-    aura::Window* target,
-    int* delta_x,
-    int* delta_y) const {
-  gfx::Size size = mouse_down_bounds_.size();
-  if (bounds_change & kBoundsChange_Resizes) {
-    gfx::Size min_size = target->delegate()->GetMinimumSize();
-    int size_change_direction =
-        GetSizeChangeDirectionForWindowComponent(window_component_);
-    size.SetSize(
-      GetWidthForDrag(size_change_direction, min_size.width(), delta_x),
-      GetHeightForDrag(size_change_direction, min_size.height(), delta_y));
-  }
-  return size;
-}
-
-int ToplevelWindowEventFilter::GetWidthForDrag(int size_change_direction,
-                                               int min_width,
-                                               int* delta_x) const {
-  int width = mouse_down_bounds_.width();
-  if (size_change_direction & kBoundsChangeDirection_Horizontal) {
-    // Along the right edge, positive delta_x increases the window size.
-    int x_multiplier = IsRightEdge(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 * (mouse_down_bounds_.width() - min_width);
-    }
-  }
-  return width;
-}
-
-int ToplevelWindowEventFilter::GetHeightForDrag(int size_change_direction,
-                                                int min_height,
-                                                int* delta_y) const {
-  int height = mouse_down_bounds_.height();
-  if (size_change_direction & kBoundsChangeDirection_Vertical) {
-    // Along the bottom edge, positive delta_y increases the window size.
-    int y_multiplier = IsBottomEdge(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 * (mouse_down_bounds_.height() - min_height);
-    }
-  }
-  return height;
-}
-
-}  // namespace aura