root/ash/wm/window_state.cc

DEFINITIONS

1. OnWindowResized
2. OnWindowAddedToLayout
3. OnWillRemoveWindowFromLayout
4. OnWindowRemovedFromLayout
5. OnChildWindowVisibilityChanged
6. SetChildBounds
7. SetBounds
8. WMEventTypeFromShowState
9. current_state_
10. HasDelegate
11. SetDelegate
12. GetStateType
13. IsMinimized
14. IsMaximized
15. IsFullscreen
16. IsMaximizedOrFullscreen
17. IsSnapped
18. IsNormalStateType
19. IsNormalOrSnapped
20. IsActive
21. IsDocked
22. CanMaximize
23. CanMinimize
24. CanResize
25. CanActivate
26. CanSnap
27. HasRestoreBounds
28. Maximize
29. Minimize
30. Unminimize
31. Activate
32. Deactivate
33. Restore
34. OnWMEvent
35. SaveCurrentBoundsForRestore
36. GetRestoreBoundsInScreen
37. GetRestoreBoundsInParent
38. SetRestoreBoundsInScreen
39. SetRestoreBoundsInParent
40. ClearRestoreBounds
41. SetStateObject
42. SetPreAutoManageWindowBounds
43. AddObserver
44. RemoveObserver
45. CreateDragDetails
46. DeleteDragDetails
47. SetAndClearRestoreBounds
48. OnWindowPropertyChanged
49. SetBoundsInScreen
50. GetShowState
51. AdjustSnappedBounds
52. UpdateWindowShowStateFromStateType
53. NotifyPreStateTypeChange
54. NotifyPostStateTypeChange
55. SetBoundsDirect
56. SetBoundsConstrained
57. SetBoundsDirectAnimated
58. SetBoundsDirectCrossFade
59. GetActiveWindowState
60. GetWindowState
61. GetWindowState

// Copyright 2013 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_state.h"

#include "ash/ash_switches.h"
#include "ash/root_window_controller.h"
#include "ash/screen_util.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/default_state.h"
#include "ash/wm/window_animations.h"
#include "ash/wm/window_properties.h"
#include "ash/wm/window_state_delegate.h"
#include "ash/wm/window_state_observer.h"
#include "ash/wm/window_util.h"
#include "ash/wm/wm_event.h"
#include "base/auto_reset.h"
#include "base/command_line.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/layout_manager.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/compositor/layer_tree_owner.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/gfx/display.h"
#include "ui/wm/core/window_util.h"

namespace ash {
namespace wm {

namespace {

// A tentative class to set the bounds on the window.
// TODO(oshima): Once all logic is cleaned up, move this to the real layout
// manager with proper friendship.
class BoundsSetter : public aura::LayoutManager {
 public:
  BoundsSetter() {}
  virtual ~BoundsSetter() {}

  // aura::LayoutManager overrides:
  virtual void OnWindowResized() OVERRIDE {}
  virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE {}
  virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE {}
  virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE {}
  virtual void OnChildWindowVisibilityChanged(
      aura::Window* child, bool visible) OVERRIDE {}
  virtual void SetChildBounds(
      aura::Window* child, const gfx::Rect& requested_bounds) OVERRIDE {}

  void SetBounds(aura::Window* window, const gfx::Rect& bounds) {
    SetChildBoundsDirect(window, bounds);
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(BoundsSetter);
};

WMEventType WMEventTypeFromShowState(ui::WindowShowState requested_show_state) {
  switch (requested_show_state) {
    case ui::SHOW_STATE_DEFAULT:
    case ui::SHOW_STATE_NORMAL:
      return WM_EVENT_NORMAL;
    case ui::SHOW_STATE_MINIMIZED:
      return WM_EVENT_MINIMIZE;
    case ui::SHOW_STATE_MAXIMIZED:
      return WM_EVENT_MAXIMIZE;
    case ui::SHOW_STATE_FULLSCREEN:
      return WM_EVENT_FULLSCREEN;
    case ui::SHOW_STATE_INACTIVE:
      return WM_EVENT_SHOW_INACTIVE;
    case ui::SHOW_STATE_DETACHED:
    case ui::SHOW_STATE_END:
      NOTREACHED() << "No WMEvent defined for the show state:"
                   << requested_show_state;
  }
  return WM_EVENT_NORMAL;
}

}  // namespace

WindowState::WindowState(aura::Window* window)
    : window_(window),
      window_position_managed_(false),
      bounds_changed_by_user_(false),
      panel_attached_(true),
      ignored_by_shelf_(false),
      can_consume_system_keys_(false),
      top_row_keys_are_function_keys_(false),
      unminimize_to_restore_bounds_(false),
      hide_shelf_when_fullscreen_(true),
      minimum_visibility_(false),
      can_be_dragged_(true),
      ignore_property_change_(false),
      current_state_(new DefaultState(ToWindowStateType(GetShowState()))) {
  window_->AddObserver(this);
}

WindowState::~WindowState() {
}

bool WindowState::HasDelegate() const {
  return delegate_;
}

void WindowState::SetDelegate(scoped_ptr<WindowStateDelegate> delegate) {
  DCHECK(!delegate_.get());
  delegate_ = delegate.Pass();
}

WindowStateType WindowState::GetStateType() const {
  return current_state_->GetType();
}

bool WindowState::IsMinimized() const {
  return GetStateType() == WINDOW_STATE_TYPE_MINIMIZED;
}

bool WindowState::IsMaximized() const {
  return GetStateType() == WINDOW_STATE_TYPE_MAXIMIZED;
}

bool WindowState::IsFullscreen() const {
  return GetStateType() == WINDOW_STATE_TYPE_FULLSCREEN;
}

bool WindowState::IsMaximizedOrFullscreen() const {
  return GetStateType() == WINDOW_STATE_TYPE_FULLSCREEN ||
      GetStateType() == WINDOW_STATE_TYPE_MAXIMIZED;
}

bool WindowState::IsSnapped() const {
  return GetStateType() == WINDOW_STATE_TYPE_LEFT_SNAPPED ||
      GetStateType() == WINDOW_STATE_TYPE_RIGHT_SNAPPED;
}

bool WindowState::IsNormalStateType() const {
  return GetStateType() == WINDOW_STATE_TYPE_NORMAL ||
      GetStateType() == WINDOW_STATE_TYPE_DEFAULT;
}

bool WindowState::IsNormalOrSnapped() const {
  return IsNormalStateType() || IsSnapped();
}

bool WindowState::IsActive() const {
  return IsActiveWindow(window_);
}

bool WindowState::IsDocked() const {
  return window_->parent() &&
         window_->parent()->id() == kShellWindowId_DockedContainer;
}

bool WindowState::CanMaximize() const {
  return window_->GetProperty(aura::client::kCanMaximizeKey);
}

bool WindowState::CanMinimize() const {
  RootWindowController* controller = RootWindowController::ForWindow(window_);
  if (!controller)
    return false;
  aura::Window* lockscreen =
      controller->GetContainer(kShellWindowId_LockScreenContainersContainer);
  if (lockscreen->Contains(window_))
    return false;

  return true;
}

bool WindowState::CanResize() const {
  return window_->GetProperty(aura::client::kCanResizeKey);
}

bool WindowState::CanActivate() const {
  return ::wm::CanActivateWindow(window_);
}

bool WindowState::CanSnap() const {
  if (!CanResize() || window_->type() == ui::wm::WINDOW_TYPE_PANEL ||
      ::wm::GetTransientParent(window_))
    return false;
  // If a window has a maximum size defined, snapping may make it too big.
  // TODO(oshima): We probably should snap if possible.
  return window_->delegate() ? window_->delegate()->GetMaximumSize().IsEmpty() :
                              true;
}

bool WindowState::HasRestoreBounds() const {
  return window_->GetProperty(aura::client::kRestoreBoundsKey) != NULL;
}

void WindowState::Maximize() {
  window_->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MAXIMIZED);
}

void WindowState::Minimize() {
  window_->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MINIMIZED);
}

void WindowState::Unminimize() {
  window_->SetProperty(
      aura::client::kShowStateKey,
      window_->GetProperty(aura::client::kRestoreShowStateKey));
  window_->ClearProperty(aura::client::kRestoreShowStateKey);
}

void WindowState::Activate() {
  ActivateWindow(window_);
}

void WindowState::Deactivate() {
  DeactivateWindow(window_);
}

void WindowState::Restore() {
  if (!IsNormalStateType()) {
    const WMEvent event(WM_EVENT_NORMAL);
    OnWMEvent(&event);
  }
}

void WindowState::OnWMEvent(const WMEvent* event) {
  current_state_->OnWMEvent(this, event);
}

void WindowState::SaveCurrentBoundsForRestore() {
  gfx::Rect bounds_in_screen =
      ScreenUtil::ConvertRectToScreen(window_->parent(),
                                      window_->bounds());
  SetRestoreBoundsInScreen(bounds_in_screen);
}

gfx::Rect WindowState::GetRestoreBoundsInScreen() const {
  return *window_->GetProperty(aura::client::kRestoreBoundsKey);
}

gfx::Rect WindowState::GetRestoreBoundsInParent() const {
  return ScreenUtil::ConvertRectFromScreen(window_->parent(),
                                          GetRestoreBoundsInScreen());
}

void WindowState::SetRestoreBoundsInScreen(const gfx::Rect& bounds) {
  window_->SetProperty(aura::client::kRestoreBoundsKey, new gfx::Rect(bounds));
}

void WindowState::SetRestoreBoundsInParent(const gfx::Rect& bounds) {
  SetRestoreBoundsInScreen(
      ScreenUtil::ConvertRectToScreen(window_->parent(), bounds));
}

void WindowState::ClearRestoreBounds() {
  window_->ClearProperty(aura::client::kRestoreBoundsKey);
}

scoped_ptr<WindowState::State> WindowState::SetStateObject(
    scoped_ptr<WindowState::State> new_state) {
  current_state_->DetachState(this);
  scoped_ptr<WindowState::State> old_object = current_state_.Pass();
  current_state_ = new_state.Pass();
  current_state_->AttachState(this, old_object.get());
  return old_object.Pass();
}

void WindowState::SetPreAutoManageWindowBounds(
    const gfx::Rect& bounds) {
  pre_auto_manage_window_bounds_.reset(new gfx::Rect(bounds));
}

void WindowState::AddObserver(WindowStateObserver* observer) {
  observer_list_.AddObserver(observer);
}

void WindowState::RemoveObserver(WindowStateObserver* observer) {
  observer_list_.RemoveObserver(observer);
}

void WindowState::CreateDragDetails(aura::Window* window,
                                    const gfx::Point& point_in_parent,
                                    int window_component,
                                    aura::client::WindowMoveSource source) {
  drag_details_.reset(
      new DragDetails(window, point_in_parent, window_component, source));
}

void WindowState::DeleteDragDetails() {
  drag_details_.reset();
}

void WindowState::SetAndClearRestoreBounds() {
  DCHECK(HasRestoreBounds());
  SetBoundsInScreen(GetRestoreBoundsInScreen());
  ClearRestoreBounds();
}

void WindowState::OnWindowPropertyChanged(aura::Window* window,
                                          const void* key,
                                          intptr_t old) {
  DCHECK_EQ(window, window_);
  if (key == aura::client::kShowStateKey && !ignore_property_change_) {
    WMEvent event(WMEventTypeFromShowState(GetShowState()));
    OnWMEvent(&event);
  }
}

void WindowState::SetBoundsInScreen(
    const gfx::Rect& bounds_in_screen) {
  gfx::Rect bounds_in_parent =
      ScreenUtil::ConvertRectFromScreen(window_->parent(),
                                       bounds_in_screen);
  window_->SetBounds(bounds_in_parent);
}

ui::WindowShowState WindowState::GetShowState() const {
  return window_->GetProperty(aura::client::kShowStateKey);
}

void WindowState::AdjustSnappedBounds(gfx::Rect* bounds) {
  if (is_dragged() || !IsSnapped())
    return;
  gfx::Rect maximized_bounds = ScreenUtil::GetMaximizedWindowBoundsInParent(
      window_);
  if (GetStateType() == WINDOW_STATE_TYPE_LEFT_SNAPPED)
    bounds->set_x(maximized_bounds.x());
  else if (GetStateType() == WINDOW_STATE_TYPE_RIGHT_SNAPPED)
    bounds->set_x(maximized_bounds.right() - bounds->width());
  bounds->set_y(maximized_bounds.y());
  bounds->set_height(maximized_bounds.height());
}

void WindowState::UpdateWindowShowStateFromStateType() {
  ui::WindowShowState new_window_state =
      ToWindowShowState(current_state_->GetType());
  if (new_window_state != GetShowState()) {
    base::AutoReset<bool> resetter(&ignore_property_change_, true);
    window_->SetProperty(aura::client::kShowStateKey, new_window_state);
  }
}

void WindowState::NotifyPreStateTypeChange(
    WindowStateType old_window_state_type) {
  FOR_EACH_OBSERVER(WindowStateObserver, observer_list_,
                    OnPreWindowStateTypeChange(this, old_window_state_type));
}

void WindowState::NotifyPostStateTypeChange(
    WindowStateType old_window_state_type) {
  FOR_EACH_OBSERVER(WindowStateObserver, observer_list_,
                    OnPostWindowStateTypeChange(this, old_window_state_type));
}

void WindowState::SetBoundsDirect(const gfx::Rect& bounds) {
  BoundsSetter().SetBounds(window_, bounds);
}

void WindowState::SetBoundsConstrained(const gfx::Rect& bounds) {
  gfx::Rect work_area_in_parent =
      ScreenUtil::GetDisplayWorkAreaBoundsInParent(window_);
  gfx::Rect child_bounds(bounds);
  AdjustBoundsSmallerThan(work_area_in_parent.size(), &child_bounds);
  SetBoundsDirect(child_bounds);
}

void WindowState::SetBoundsDirectAnimated(const gfx::Rect& bounds) {
  const int kBoundsChangeSlideDurationMs = 120;

  ui::Layer* layer = window_->layer();
  ui::ScopedLayerAnimationSettings slide_settings(layer->GetAnimator());
  slide_settings.SetPreemptionStrategy(
      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
  slide_settings.SetTransitionDuration(
      base::TimeDelta::FromMilliseconds(kBoundsChangeSlideDurationMs));
  SetBoundsDirect(bounds);
}

void WindowState::SetBoundsDirectCrossFade(const gfx::Rect& new_bounds) {
  // Some test results in invoking CrossFadeToBounds when window is not visible.
  // No animation is necessary in that case, thus just change the bounds and
  // quit.
  if (!window_->TargetVisibility()) {
    SetBoundsConstrained(new_bounds);
    return;
  }

  const gfx::Rect old_bounds = window_->bounds();

  // Create fresh layers for the window and all its children to paint into.
  // Takes ownership of the old layer and all its children, which will be
  // cleaned up after the animation completes.
  // Specify |set_bounds| to true here to keep the old bounds in the child
  // windows of |window|.
  scoped_ptr<ui::LayerTreeOwner> old_layer_owner =
      ::wm::RecreateLayers(window_);
  ui::Layer* old_layer = old_layer_owner->root();
  DCHECK(old_layer);
  ui::Layer* new_layer = window_->layer();

  // Resize the window to the new size, which will force a layout and paint.
  SetBoundsDirect(new_bounds);

  // Ensure the higher-resolution layer is on top.
  bool old_on_top = (old_bounds.width() > new_bounds.width());
  if (old_on_top)
    old_layer->parent()->StackBelow(new_layer, old_layer);
  else
    old_layer->parent()->StackAbove(new_layer, old_layer);

  CrossFadeAnimation(window_, old_layer_owner.Pass(), gfx::Tween::EASE_OUT);
}

WindowState* GetActiveWindowState() {
  aura::Window* active = GetActiveWindow();
  return active ? GetWindowState(active) : NULL;
}

WindowState* GetWindowState(aura::Window* window) {
  if (!window)
    return NULL;
  WindowState* settings = window->GetProperty(kWindowStateKey);
  if(!settings) {
    settings = new WindowState(window);
    window->SetProperty(kWindowStateKey, settings);
  }
  return settings;
}

const WindowState* GetWindowState(const aura::Window* window) {
  return GetWindowState(const_cast<aura::Window*>(window));
}

}  // namespace wm
}  // namespace ash