Revert "Remove aura and make a pure mojo::View version of the aura::Window FocusController."

mojo/services/window_manager/focus_controller.cc

-// Copyright 2014 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 "mojo/services/window_manager/focus_controller.h"
-
-#include "base/auto_reset.h"
-#include "mojo/services/public/cpp/view_manager/view_tracker.h"
-#include "mojo/services/window_manager/focus_controller_observer.h"
-#include "mojo/services/window_manager/focus_rules.h"
-#include "mojo/services/window_manager/view_target.h"
-#include "mojo/services/window_manager/window_manager_app.h"
-#include "ui/events/event.h"
-
-namespace mojo {
-
-FocusController::FocusController(scoped_ptr<FocusRules> rules)
-    : active_view_(nullptr),
-      focused_view_(nullptr),
-      updating_focus_(false),
-      updating_activation_(false),
-      rules_(rules.Pass()),
-      observer_manager_(this) {
-  DCHECK(rules_);
-}
-
-FocusController::~FocusController() {}
-
-void FocusController::AddObserver(FocusControllerObserver* observer) {
-  focus_controller_observers_.AddObserver(observer);
-}
-
-void FocusController::RemoveObserver(FocusControllerObserver* observer) {
-  focus_controller_observers_.RemoveObserver(observer);
-}
-
-void FocusController::ActivateView(View* view) {
-  FocusView(view);
-}
-
-void FocusController::DeactivateView(View* view) {
-  if (view)
-    FocusView(rules_->GetNextActivatableView(view));
-}
-
-View* FocusController::GetActiveView() {
-  return active_view_;
-}
-
-View* FocusController::GetActivatableView(View* view) {
-  return rules_->GetActivatableView(view);
-}
-
-View* FocusController::GetToplevelView(View* view) {
-  return rules_->GetToplevelView(view);
-}
-
-bool FocusController::CanActivateView(View* view) const {
-  return rules_->CanActivateView(view);
-}
-
-void FocusController::FocusView(View* view) {
-  if (view &&
-      (view->Contains(focused_view_) || view->Contains(active_view_))) {
-    return;
-  }
-
-  // TODO(erg): We need to early abort in the of a view having
-  // capture. However, we currently don't have a capture client here.
-
-  // Focusing a window also activates its containing activatable window. Note
-  // that the rules could redirect activation activation and/or focus.
-  View* focusable = rules_->GetFocusableView(view);
-  View* activatable =
-      focusable ? rules_->GetActivatableView(focusable) : nullptr;
-
-  // We need valid focusable/activatable windows in the event we're not clearing
-  // focus. "Clearing focus" is inferred by whether or not |window| passed to
-  // this function is non-null.
-  if (view && (!focusable || !activatable))
-    return;
-  DCHECK((focusable && activatable) || !view);
-
-  // Activation change observers may change the focused window. If this happens
-  // we must not adjust the focus below since this will clobber that change.
-  View* last_focused_view = focused_view_;
-  if (!updating_activation_)
-    SetActiveView(view, activatable);
-
-  // If the window's ActivationChangeObserver shifted focus to a valid window,
-  // we don't want to focus the window we thought would be focused by default.
-  bool activation_changed_focus = last_focused_view != focused_view_;
-  if (!updating_focus_ && (!activation_changed_focus || !focused_view_)) {
-    if (active_view_ && focusable)
-      DCHECK(active_view_->Contains(focusable));
-    SetFocusedView(focusable);
-  }
-}
-
-void FocusController::ResetFocusWithinActiveView(View* view) {
-  DCHECK(view);
-  if (!active_view_)
-    return;
-  if (!active_view_->Contains(view))
-    return;
-  SetFocusedView(view);
-}
-
-View* FocusController::GetFocusedView() {
-  return focused_view_;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// FocusController, ui::EventHandler implementation:
-
-void FocusController::OnKeyEvent(ui::KeyEvent* event) {
-}
-
-void FocusController::OnMouseEvent(ui::MouseEvent* event) {
-  if (event->type() == ui::ET_MOUSE_PRESSED && !event->handled()) {
-    View* view = mojo::WindowManagerApp::GetViewForViewTarget(
-        static_cast<ViewTarget*>(event->target()));
-    ViewFocusedFromInputEvent(view);
-  }
-}
-
-void FocusController::OnScrollEvent(ui::ScrollEvent* event) {
-}
-
-void FocusController::OnTouchEvent(ui::TouchEvent* event) {
-}
-
-void FocusController::OnGestureEvent(ui::GestureEvent* event) {
-  if (event->type() == ui::ET_GESTURE_BEGIN &&
-      event->details().touch_points() == 1 &&
-      !event->handled()) {
-    View* view = mojo::WindowManagerApp::GetViewForViewTarget(
-        static_cast<ViewTarget*>(event->target()));
-    ViewFocusedFromInputEvent(view);
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// FocusController, aura::WindowObserver implementation:
-
-void FocusController::OnViewVisibilityChanged(View* view) {
-  bool visible = view->visible();
-  if (!visible)
-    ViewLostFocusFromDispositionChange(view, view->parent());
-}
-
-void FocusController::OnViewDestroying(View* view) {
-  ViewLostFocusFromDispositionChange(view, view->parent());
-}
-
-void FocusController::OnTreeChanging(const TreeChangeParams& params) {
-  // TODO(erg): In the aura version, you could get into a situation where you
-  // have different focus clients, so you had to check for that. Does that
-  // happen here? Could we get away with not checking if it does?
-  if (params.receiver == active_view_ &&
-      params.target->Contains(params.receiver) &&
-      (!params.new_parent ||
-       /* different_focus_clients */ false)) {
-    ViewLostFocusFromDispositionChange(params.receiver, params.old_parent);
-  }
-}
-
-void FocusController::OnTreeChanged(const TreeChangeParams& params) {
-  // TODO(erg): Same as Changing version.
-  if (params.receiver == focused_view_ &&
-      params.target->Contains(params.receiver) &&
-      (!params.new_parent ||
-       /* different_focus_clients */ false)) {
-    ViewLostFocusFromDispositionChange(params.receiver, params.old_parent);
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// FocusController, private:
-
-void FocusController::SetFocusedView(View* view) {
-  if (updating_focus_ || view == focused_view_)
-    return;
-  DCHECK(rules_->CanFocusView(view));
-  if (view)
-    DCHECK_EQ(view, rules_->GetFocusableView(view));
-
-  base::AutoReset<bool> updating_focus(&updating_focus_, true);
-  View* lost_focus = focused_view_;
-
-  // TODO(erg): In the aura version, we reset the text input client here. Do
-  // that if we bring in something like the TextInputClient.
-
-  // Allow for the window losing focus to be deleted during dispatch. If it is
-  // deleted pass null to observers instead of a deleted window.
-  ViewTracker view_tracker;
-  if (lost_focus)
-    view_tracker.Add(lost_focus);
-  if (focused_view_ && observer_manager_.IsObserving(focused_view_) &&
-      focused_view_ != active_view_) {
-    observer_manager_.Remove(focused_view_);
-  }
-  focused_view_ = view;
-  if (focused_view_ && !observer_manager_.IsObserving(focused_view_))
-    observer_manager_.Add(focused_view_);
-
-  FOR_EACH_OBSERVER(FocusControllerObserver,
-                    focus_controller_observers_,
-                    OnViewFocused(focused_view_,
-                                  view_tracker.Contains(lost_focus) ?
-                                  lost_focus : nullptr));
-
-  // TODO(erg): In aura, there's a concept of a single FocusChangeObserver that
-  // is attached to an aura::Window. We don't currently have this in
-  // mojo::View, but if we add it later, we should make something analogous
-  // here.
-
-  // TODO(erg): In the aura version, we reset the TextInputClient here, too.
-}
-
-void FocusController::SetActiveView(View* requested_view, View* view) {
-  if (updating_activation_)
-    return;
-
-  if (view == active_view_) {
-    if (requested_view) {
-      FOR_EACH_OBSERVER(FocusControllerObserver,
-                        focus_controller_observers_,
-                        OnAttemptToReactivateView(requested_view,
-                                                  active_view_));
-    }
-    return;
-  }
-
-  DCHECK(rules_->CanActivateView(view));
-  if (view)
-    DCHECK_EQ(view, rules_->GetActivatableView(view));
-
-  base::AutoReset<bool> updating_activation(&updating_activation_, true);
-  View* lost_activation = active_view_;
-  // Allow for the window losing activation to be deleted during dispatch. If
-  // it is deleted pass null to observers instead of a deleted window.
-  ViewTracker view_tracker;
-  if (lost_activation)
-    view_tracker.Add(lost_activation);
-  if (active_view_ && observer_manager_.IsObserving(active_view_) &&
-      focused_view_ != active_view_) {
-    observer_manager_.Remove(active_view_);
-  }
-  active_view_ = view;
-  if (active_view_ && !observer_manager_.IsObserving(active_view_))
-    observer_manager_.Add(active_view_);
-
-  if (active_view_) {
-    // TODO(erg): Reenable this when we have modal windows.
-    // StackTransientParentsBelowModalWindow(active_view_);
-
-    active_view_->MoveToFront();
-  }
-
-  // TODO(erg): Individual windows can have a single ActivationChangeObserver
-  // set on them. In the aura version of this code, it sends an
-  // OnWindowActivated message to both the window that lost activation, and the
-  // window that gained it.
-
-  FOR_EACH_OBSERVER(FocusControllerObserver,
-                    focus_controller_observers_,
-                    OnViewActivated(active_view_,
-                                    view_tracker.Contains(lost_activation) ?
-                                    lost_activation : nullptr));
-}
-
-void FocusController::ViewLostFocusFromDispositionChange(
-    View* view,
-    View* next) {
-  // TODO(erg): We clear the modality state here in the aura::Window version of
-  // this class, and should probably do the same once we have modal windows.
-
-  // TODO(beng): See if this function can be replaced by a call to
-  //             FocusWindow().
-  // Activation adjustments are handled first in the event of a disposition
-  // changed. If an activation change is necessary, focus is reset as part of
-  // that process so there's no point in updating focus independently.
-  if (view == active_view_) {
-    View* next_activatable = rules_->GetNextActivatableView(view);
-    SetActiveView(nullptr, next_activatable);
-    if (!(active_view_ && active_view_->Contains(focused_view_)))
-      SetFocusedView(next_activatable);
-  } else if (view->Contains(focused_view_)) {
-    // Active window isn't changing, but focused window might be.
-    SetFocusedView(rules_->GetFocusableView(next));
-  }
-}
-
-void FocusController::ViewFocusedFromInputEvent(View* view) {
-  // Only focus |window| if it or any of its parents can be focused. Otherwise
-  // FocusWindow() will focus the topmost window, which may not be the
-  // currently focused one.
-  if (rules_->CanFocusView(GetToplevelView(view)))
-    FocusView(view);
-}
-
-}  // namespace mojo