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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/ws/server_window_drawn_tracker.h"
#include "components/mus/ws/server_window.h"
#include "components/mus/ws/server_window_drawn_tracker_observer.h"
namespace mus {
namespace ws {
ServerWindowDrawnTracker::ServerWindowDrawnTracker(
ServerWindow* window,
ServerWindowDrawnTrackerObserver* observer)
: window_(window), observer_(observer), drawn_(window->IsDrawn()) {
AddObservers();
}
ServerWindowDrawnTracker::~ServerWindowDrawnTracker() {
RemoveObservers();
}
void ServerWindowDrawnTracker::SetDrawn(ServerWindow* ancestor, bool drawn) {
if (drawn == drawn_)
return;
drawn_ = drawn;
observer_->OnDrawnStateChanged(ancestor, window_, drawn);
}
void ServerWindowDrawnTracker::AddObservers() {
if (!window_)
return;
for (ServerWindow* v = window_; v; v = v->parent()) {
v->AddObserver(this);
windows_.insert(v);
}
}
void ServerWindowDrawnTracker::RemoveObservers() {
for (ServerWindow* window : windows_)
window->RemoveObserver(this);
windows_.clear();
}
void ServerWindowDrawnTracker::OnWindowDestroyed(ServerWindow* window) {
// As windows are removed before being destroyed, resulting in
// OnWindowHierarchyChanged() and us removing ourself as an observer, the only
// window we should ever get notified of destruction on is |window_|.
DCHECK_EQ(window, window_);
RemoveObservers();
window_ = nullptr;
SetDrawn(nullptr, false);
}
void ServerWindowDrawnTracker::OnWindowHierarchyChanged(
ServerWindow* window,
ServerWindow* new_parent,
ServerWindow* old_parent) {
RemoveObservers();
AddObservers();
const bool is_drawn = window_->IsDrawn();
SetDrawn(is_drawn ? nullptr : old_parent, is_drawn);
}
void ServerWindowDrawnTracker::OnWindowVisibilityChanged(ServerWindow* window) {
const bool is_drawn = window_->IsDrawn();
SetDrawn(is_drawn ? nullptr : window->parent(), is_drawn);
}
} // namespace ws
} // namespace mus
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