[Mac] Refactor the Fullscreen Toolbar

chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_animation_manager.mm

+// Copyright 2016 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.
+
+#import "chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_animation_manager.h"
+
+#import "chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_layout_manager.h"
+#import "third_party/google_toolbox_for_mac/src/AppKit/GTMNSAnimation+Duration.h"
+
+namespace {
+
+// The duration of the toolbar show/hide animation in ms.
+const NSTimeInterval kToolbarAnimationDuration = 200;
+
+// If the fullscreen toolbar is hidden, it is difficult for the user to see
+// changes in the tabstrip. As a result, if a tab is inserted or the current
+// tab switched to a new one, the toolbar must animate in and out to display
+// the tabstrip changes to the user. The animation drops down the toolbar and
+// then wait for 0.75 seconds before it hides the toolbar.
+const NSTimeInterval kTabStripChangesDelay = 750;
+
+}  // end namespace
+
+//////////////////////////////////////////////////////////////////
+// FullscreenToolbarAnimationManager, public:
+
+FullscreenToolbarAnimationManager::FullscreenToolbarAnimationManager(
+    FullscreenToolbarLayoutManager* owner)
+    : owner_(owner),
+      animation_(this),
+      hide_toolbar_timer_(
+          FROM_HERE,
+          base::TimeDelta::FromMilliseconds(kTabStripChangesDelay),
+          base::Bind(
+              &FullscreenToolbarAnimationManager::AnimateToolbarOutIfPossible,
+              base::Unretained(this)),
+          false),
+      toolbar_fraction_(0),
+      should_hide_toolbar_after_delay_(false),
+      disable_animations_during_testing_(false) {
+  animation_.SetSlideDuration(kToolbarAnimationDuration);
+  animation_.SetTweenType(gfx::Tween::EASE_OUT);
+}
+
+void FullscreenToolbarAnimationManager::UpdateToolbarFraction(
+    CGFloat fraction) {
+  toolbar_fraction_ = fraction;
+}
+
+void FullscreenToolbarAnimationManager::StopAnimationAndTimer() {
+  animation_.Stop();
+  hide_toolbar_timer_.Stop();
+}
+
+void FullscreenToolbarAnimationManager::AnimateToolbarForTabstripChanges() {
+  if (owner_->MustShowFullscreenToolbar())
+    return;
+
+  AnimateToolbarIn();
+  should_hide_toolbar_after_delay_ = true;
+}
+
+void FullscreenToolbarAnimationManager::AnimateToolbarIn() {
+  if (!owner_->in_fullscreen_mode())
+    return;
+
+  if (animation_.IsShowing())
+    return;
+
+  if (disable_animations_during_testing_) {
+    toolbar_fraction_ = 1.0;
+    owner_->Layout();
+    return;
+  }
+
+  animation_.Reset(toolbar_fraction_);
+  animation_.Show();
+}
+
+void FullscreenToolbarAnimationManager::AnimateToolbarOutIfPossible() {
+  if (!owner_->in_fullscreen_mode())
+    return;
+
+  if (animation_.IsClosing())
+    return;
+
+  if (disable_animations_during_testing_) {
+    toolbar_fraction_ = 0;
+    owner_->Layout();
+    return;
+  }
+
+  if (owner_->MustShowFullscreenToolbar())
+    return;
+
+  animation_.Reset(toolbar_fraction_);
+  animation_.Hide();
+}
+
+CGFloat FullscreenToolbarAnimationManager::GetToolbarFraction() const {
+  return toolbar_fraction_;
+}
+
+BOOL FullscreenToolbarAnimationManager::IsAnimationRunning() const {
+  return animation_.is_animating();
+}
+
+//////////////////////////////////////////////////////////////////
+// FullscreenToolbarAnimationManager::AnimationDelegate:
+
+void FullscreenToolbarAnimationManager::AnimationProgressed(
+    const gfx::Animation* animation) {
+  toolbar_fraction_ = animation->GetCurrentValue();
+  owner_->Layout();
+}
+
+void FullscreenToolbarAnimationManager::AnimationEnded(
+    const gfx::Animation* animation) {
+  if (animation_.IsShowing() && should_hide_toolbar_after_delay_) {
+    hide_toolbar_timer_.Reset();
+    should_hide_toolbar_after_delay_ = false;
+  }
+}