Refactor GestureNavigation to eliminate code redundancy

content/browser/web_contents/aura/overscroll_navigation_overlay.cc

Index: content/browser/web_contents/aura/overscroll_navigation_overlay.cc
diff --git a/content/browser/web_contents/aura/overscroll_navigation_overlay.cc b/content/browser/web_contents/aura/overscroll_navigation_overlay.cc
index a96b0d27ed66cd46912ebc7d55fdee0feb5e9f9c..a6e6c3c7d3ba1851bfcc63e2fa8713c94eea3a64 100644
--- a/content/browser/web_contents/aura/overscroll_navigation_overlay.cc
+++ b/content/browser/web_contents/aura/overscroll_navigation_overlay.cc
@@ -6,6 +6,8 @@
 
 #include "content/browser/frame_host/navigation_entry_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/browser/web_contents/aura/overscroll_layer_wrapper.h"
+#include "content/browser/web_contents/aura/overscroll_window_delegate.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/browser_thread.h"
@@ -18,7 +20,6 @@
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image_png_rep.h"
-#include "ui/gfx/image/image_skia.h"
 
 namespace content {
 namespace {
@@ -43,6 +44,7 @@ bool DoesEntryMatchURL(NavigationEntry* entry, const GURL& url) {
 }  // namespace
 
 // A LayerDelegate that paints an image for the layer.
+// TODO move to overscroll_window.h
 class ImageLayerDelegate : public ui::LayerDelegate {
  public:
   ImageLayerDelegate() {}
@@ -130,18 +132,23 @@ class OverlayDismissAnimator
 };
 
 OverscrollNavigationOverlay::OverscrollNavigationOverlay(
-    WebContentsImpl* web_contents)
-    : web_contents_(web_contents),
-      image_delegate_(NULL),
+    WebContentsImpl* web_contents,
+    OverscrollWindowAnimation* owa,
+    aura::Window* web_contents_window)
+    : direction_(OverscrollWindowAnimation::NONE),
+      web_contents_(web_contents),
+      image_delegate_(nullptr),
       loading_complete_(false),
       received_paint_update_(false),
-      slide_direction_(SLIDE_UNKNOWN) {
+      owa_(owa),
+      web_contents_window_(web_contents_window) {
 }
 
 OverscrollNavigationOverlay::~OverscrollNavigationOverlay() {
 }
 
 void OverscrollNavigationOverlay::StartObserving() {
+  LOG(ERROR) << "Starting to observe";
   loading_complete_ = false;
   received_paint_update_ = false;
   overlay_dismiss_layer_.reset();
@@ -154,16 +161,39 @@ void OverscrollNavigationOverlay::StartObserving() {
   // Assumes the navigation has been initiated.
   NavigationEntry* pending_entry =
       web_contents_->GetController().GetPendingEntry();
+
   // Save url of the pending entry to identify when it loads and paints later.
   // Under some circumstances navigation can leave a null pending entry -
   // see comments in NavigationControllerImpl::NavigateToPendingEntry().
   pending_entry_url_ = pending_entry ? pending_entry->GetURL() : GURL();
+  LOG(ERROR) << "URL: " << pending_entry_url_.GetContent();
 }
 
-void OverscrollNavigationOverlay::SetOverlayWindow(
-    scoped_ptr<aura::Window> window,
-    aura_extra::ImageWindowDelegate* delegate) {
-  window_ = window.Pass();
+void OverscrollNavigationOverlay::SetupOverlayWindow() {
+  LOG(ERROR) << "ONO: Setting overlay window";
+  // TODO use OverscrollWindowDelegate instead.
+  aura_extra::ImageWindowDelegate* image_delegate =
+      new aura_extra::ImageWindowDelegate();
+  image_delegate->set_background_color(SK_ColorWHITE);
+  gfx::Image image = GetImageForDirection(direction_);
+  if (image.IsEmpty())
+    LOG(ERROR) << "Image is empty";
+  image_delegate->SetImage(image);
+  window_.reset(new aura::Window(image_delegate));
+  window_->SetType(ui::wm::WINDOW_TYPE_CONTROL);
+  window_->SetTransparent(true);
+  window_->Init(aura::WINDOW_LAYER_TEXTURED);
+  window_->layer()->SetMasksToBounds(false);
+  window_->SetName("OverscrollOverlay");
+  window_->layer()->SetLayerBrightness(-0.1f);
+  web_contents_window_->AddChild(window_.get());
+
+  gfx::Rect bounds = gfx::Rect(web_contents_window_->bounds().size());
+  if (direction_ == OverscrollWindowAnimation::FORWARD)
+    bounds.Offset(base::i18n::IsRTL() ? -bounds.width() : bounds.width(), 0);
+  window_->SetBounds(bounds);
+  window_->Show();
+  /*window_ = window.Pass();
   if (window_.get() && window_->parent())
     window_->parent()->StackChildAtTop(window_.get());
   image_delegate_ = delegate;
@@ -175,18 +205,102 @@ void OverscrollNavigationOverlay::SetOverlayWindow(
     slide_direction_ = SLIDE_UNKNOWN;
   } else {
     window_slider_.reset();
+  }*/
+}
+
+const gfx::Image OverscrollNavigationOverlay::GetImageForDirection(
+    OverscrollWindowAnimation::Direction direction) const {
+  const NavigationControllerImpl& controller = web_contents_->GetController();
+  const NavigationEntryImpl* entry = NavigationEntryImpl::FromNavigationEntry(
+      controller.GetEntryAtOffset(
+          direction == OverscrollWindowAnimation::FORWARD ? 1 : -1));
+
+  if (entry && entry->screenshot().get()) {
+    std::vector<gfx::ImagePNGRep> image_reps;
+    image_reps.push_back(gfx::ImagePNGRep(entry->screenshot(), 1.0f));
+    return gfx::Image(image_reps);
+  }
+  return gfx::Image();
+}
+
+scoped_ptr<OverscrollLayerWrapper> OverscrollNavigationOverlay::CreateLayer() {
+  LOG(ERROR) << "ONO: CreateLayer";
+  scoped_ptr<OverscrollLayerWrapper> layer_wrapper(
+      new OverscrollLayerWrapper());
+  if (!window_) {
+    SetupOverlayWindow();
+    if (direction_ == OverscrollWindowAnimation::FORWARD) {
+      layer_wrapper->WrapWindow(window_.get());
+      web_contents_window_->StackChildAbove(
+          window_.get(), web_contents_->GetContentNativeView());
+    } else {
+      layer_wrapper->WrapWindow(web_contents_->GetContentNativeView());
+      web_contents_window_->StackChildBelow(
+          window_.get(), web_contents_->GetContentNativeView());
+    }
+  } else {
+    LOG(ERROR) << "NOT IMPLEMENTED: SET UP LAYER";
+    // TODO set up the layer.
   }
+  return layer_wrapper.Pass();
+}
+
+scoped_ptr<OverscrollLayerWrapper>
+OverscrollNavigationOverlay::CreateFrontLayer() {
+  LOG(ERROR) << "ONO: Create front layer";
+  if (!web_contents_->GetController().CanGoForward())
+      return nullptr;
+  direction_ = OverscrollWindowAnimation::FORWARD;
+  return CreateLayer();
+}
+
+scoped_ptr<OverscrollLayerWrapper>
+OverscrollNavigationOverlay::CreateBackLayer() {
+  LOG(ERROR) << "ONO: Create back layer";
+  if (!web_contents_->GetController().CanGoBack())
+      return nullptr;
+  direction_ = OverscrollWindowAnimation::BACKWARD;
+  return CreateLayer();
+}
+
+void OverscrollNavigationOverlay::OnOverscrollCompleted() {
+  // TODO write actual code.
+  LOG(ERROR) << "ONO: OnOverscrollCompleted";
+  window_.reset();
+}
+
+void OverscrollNavigationOverlay::OnOverscrollCompleting() {
+
+}
+
+void OverscrollNavigationOverlay::FadeOutOverscrollWindow() {
+  LOG(ERROR) << "FadeOutOverscrollWindow";
+  // TODO maybe we do not need this check.
+  if (!window_)
+    return;
+  aura::Window* contents = web_contents_->GetContentNativeView();
+  contents->layer()->SetLayerBrightness(1.f);
+  {
+    ui::ScopedLayerAnimationSettings settings(contents->layer()->GetAnimator());
+    settings.SetPreemptionStrategy(
+        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
+    settings.SetTweenType(gfx::Tween::EASE_OUT);
+    contents->layer()->SetLayerBrightness(0.f);
+  }
+  scoped_ptr<ui::Layer> dismiss_layer = window_->AcquireLayer();
+  window_.reset();
+  (new OverlayDismissAnimator(dismiss_layer.Pass()))->Animate();
 }
 
 void OverscrollNavigationOverlay::StopObservingIfDone() {
+  LOG(ERROR) << "Stop observing if done";
   // Normally we dismiss the overlay once we receive a paint update, however
   // for in-page navigations DidFirstVisuallyNonEmptyPaint() does not get
   // called, and we rely on loading_complete_ for those cases.
   if (!received_paint_update_ && !loading_complete_)
     return;
 
-  // If a slide is in progress, then do not destroy the window or the slide.
-  if (window_slider_.get() && window_slider_->IsSlideInProgress())
+  if (owa_->is_animation_in_progress())
     return;
 
   // The layer to be animated by OverlayDismissAnimator
@@ -195,37 +309,25 @@ void OverscrollNavigationOverlay::StopObservingIfDone() {
     overlay_dismiss_layer = overlay_dismiss_layer_.Pass();
   else if (window_.get())
     overlay_dismiss_layer = window_->AcquireLayer();
+  LOG(ERROR) << "Resetting window slider";
   Observe(NULL);
-  window_slider_.reset();
-  window_.reset();
-  image_delegate_ = NULL;
-  if (overlay_dismiss_layer.get()) {
-    // OverlayDismissAnimator deletes overlay_dismiss_layer and itself when the
-    // animation completes.
-    (new OverlayDismissAnimator(overlay_dismiss_layer.Pass()))->Animate();
-  }
 }
 
+// TODO delete these *Layer functions.
 ui::Layer* OverscrollNavigationOverlay::CreateSlideLayer(int offset) {
-  const NavigationControllerImpl& controller = web_contents_->GetController();
-  const NavigationEntryImpl* entry = controller.GetEntryAtOffset(offset);
-
-  gfx::Image image;
-  if (entry && entry->screenshot().get()) {
-    std::vector<gfx::ImagePNGRep> image_reps;
-    image_reps.push_back(gfx::ImagePNGRep(entry->screenshot(), 1.0f));
-    image = gfx::Image(image_reps);
-  }
   if (!layer_delegate_)
     layer_delegate_.reset(new ImageLayerDelegate());
-  layer_delegate_->SetImage(image);
+  // TODO fixme.
+  layer_delegate_->SetImage(
+      GetImageForDirection(offset == -1 ? OverscrollWindowAnimation::BACKWARD
+                                        : OverscrollWindowAnimation::FORWARD));
 
   ui::Layer* layer = new ui::Layer(ui::LAYER_TEXTURED);
   layer->set_delegate(layer_delegate_.get());
   return layer;
 }
 
-ui::Layer* OverscrollNavigationOverlay::CreateBackLayer() {
+/*ui::Layer* OverscrollNavigationOverlay::CreateBackLayer() {
   if (!web_contents_->GetController().CanGoBack())
     return NULL;
   slide_direction_ = SLIDE_BACK;
@@ -254,29 +356,9 @@ void OverscrollNavigationOverlay::OnWindowSlideCompleting() {
   // Reset state and wait for the new navigation page to complete
   // loading/painting.
   StartObserving();
-}
+}*/
 
-void OverscrollNavigationOverlay::OnWindowSlideCompleted(
-    scoped_ptr<ui::Layer> layer) {
-  if (slide_direction_ == SLIDE_UNKNOWN) {
-    window_slider_.reset();
-    StopObservingIfDone();
-    return;
-  }
-
-  // Change the image used for the overlay window.
-  image_delegate_->SetImage(layer_delegate_->image());
-  window_->layer()->SetTransform(gfx::Transform());
-  window_->SchedulePaintInRect(gfx::Rect(window_->bounds().size()));
-  slide_direction_ = SLIDE_UNKNOWN;
-  // We may end up dismissing the overlay before it has a chance to repaint, so
-  // set the slider layer to be the one animated by OverlayDismissAnimator.
-  if (layer.get())
-    overlay_dismiss_layer_ = layer.Pass();
-  StopObservingIfDone();
-}
-
-void OverscrollNavigationOverlay::OnWindowSlideAborted() {
+/*void OverscrollNavigationOverlay::OnWindowSlideAborted() {
   StopObservingIfDone();
 }
 
@@ -292,9 +374,10 @@ void OverscrollNavigationOverlay::OnWindowSliderDestroyed() {
     ignore_result(window_slider_.release());
     StopObservingIfDone();
   }
-}
+}*/
 
 void OverscrollNavigationOverlay::DidFirstVisuallyNonEmptyPaint() {
+  LOG(ERROR) << "Did first visually non empty paint";
   NavigationEntry* visible_entry =
       web_contents_->GetController().GetVisibleEntry();
   if (pending_entry_url_.is_empty() ||
@@ -305,6 +388,7 @@ void OverscrollNavigationOverlay::DidFirstVisuallyNonEmptyPaint() {
 }
 
 void OverscrollNavigationOverlay::DidStopLoading(RenderViewHost* host) {
+  LOG(ERROR) << "Did stop loading";
   // Don't compare URLs in this case - it's possible they won't match if
   // a gesture-nav initiated navigation was interrupted by some other in-site
   // navigation ((e.g., from a script, or from a bookmark).
@@ -312,4 +396,22 @@ void OverscrollNavigationOverlay::DidStopLoading(RenderViewHost* host) {
   StopObservingIfDone();
 }
 
+/*aura::Window* OverscrollNavigationOverlay::GetWindowToAnimateForOverscroll()
+    const {
+  return direction_ == OverscrollNavigationOverlay::FORWARD
+             ? window_.get()
+             : web_contents_->GetContentNativeView();
+}
+
+gfx::Rect OverscrollNavigationOverlay::GetStarterBounds() const {
+  gfx::Rect bounds = gfx::Rect(web_contents_window_->bounds().size());
+  if (direction_ == OverscrollNavigationOverlay::FORWARD) {
+    // The overlay will be sliding in from the right edge towards the left in
+    // non-RTL, or sliding in from the left edge towards the right in RTL.
+    // So position the overlay window accordingly.
+    bounds.Offset(base::i18n::IsRTL() ? -bounds.width() : bounds.width(), 0);
+  }
+  return bounds;
+}*/
+
 }  // namespace content