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// Copyright 2015 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 "components/mus/focus_controller.h"
#include "components/mus/focus_controller_delegate.h"
#include "components/mus/server_view.h"
#include "components/mus/server_view_drawn_tracker.h"
namespace view_manager {
FocusController::FocusController(FocusControllerDelegate* delegate)
: delegate_(delegate) {}
FocusController::~FocusController() {}
void FocusController::SetFocusedView(ServerView* view) {
if (GetFocusedView() == view)
return;
SetFocusedViewImpl(view, CHANGE_SOURCE_EXPLICIT);
}
ServerView* FocusController::GetFocusedView() {
return drawn_tracker_ ? drawn_tracker_->view() : nullptr;
}
void FocusController::SetFocusedViewImpl(ServerView* view,
ChangeSource change_source) {
ServerView* old = GetFocusedView();
DCHECK(!view || view->IsDrawn());
if (view)
drawn_tracker_.reset(new ServerViewDrawnTracker(view, this));
else
drawn_tracker_.reset();
if (change_source == CHANGE_SOURCE_DRAWN_STATE_CHANGED)
delegate_->OnFocusChanged(old, view);
}
void FocusController::OnDrawnStateChanged(ServerView* ancestor,
ServerView* view,
bool is_drawn) {
DCHECK(!is_drawn); // We only observe when drawn.
SetFocusedViewImpl(ancestor, CHANGE_SOURCE_DRAWN_STATE_CHANGED);
}
} // namespace view_manager
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