components/view_manager/focus_controller.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/view_manager/focus_controller.h"
   6
   7 #include "components/view_manager/focus_controller_delegate.h"
   8 #include "components/view_manager/server_view.h"
   9 #include "components/view_manager/server_view_drawn_tracker.h"
  10
  11 namespace view_manager {
  12
  13 FocusController::FocusController(FocusControllerDelegate* delegate)
  14     : delegate_(delegate) {
  15 }
  16
  17 FocusController::~FocusController() {
  18 }
  19
  20 void FocusController::SetFocusedView(ServerView* view) {
  21   if (GetFocusedView() == view)
  22     return;
  23
  24   SetFocusedViewImpl(view, CHANGE_SOURCE_EXPLICIT);
  25 }
  26
  27 ServerView* FocusController::GetFocusedView() {
  28   return drawn_tracker_ ? drawn_tracker_->view() : nullptr;
  29 }
  30
  31 void FocusController::SetFocusedViewImpl(ServerView* view,
  32                                          ChangeSource change_source) {
  33   ServerView* old = GetFocusedView();
  34
  35   DCHECK(!view || view->IsDrawn());
  36
  37   if (view)
  38     drawn_tracker_.reset(new ServerViewDrawnTracker(view, this));
  39   else
  40     drawn_tracker_.reset();
  41
  42   if (change_source == CHANGE_SOURCE_DRAWN_STATE_CHANGED)
  43     delegate_->OnFocusChanged(old, view);
  44 }
  45
  46 void FocusController::OnDrawnStateChanged(ServerView* ancestor,
  47                                           ServerView* view,
  48                                           bool is_drawn) {
  49   DCHECK(!is_drawn);  // We only observe when drawn.
  50   SetFocusedViewImpl(ancestor, CHANGE_SOURCE_DRAWN_STATE_CHANGED);
  51 }
  52
  53 }  // namespace view_manager